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Abstract

This study developed an ankle rehabilitation device for post-stroke patients. First, the research models and dynamic equations of the device are addressed. Second, the Sliding Mode Controller for the ankle rehabilitation device is designed, and the device's response is simulated on the software MATLAB. Third, the ankle rehabilitation device is successfully manufactured from aluminum and uses linear actuators to emulate dorsiflexion and plantarflexion exercises for humans. The advantages of the device are a simple design, low cost, and mounts onto rehabilitative equipment. The device can operate fast through experiments, has a foot drive mechanism overshoot of 0°, and a maximum angle error of 1°. Moreover, the rehabilitation robot can operate consistently and is comfortable for stroke patients to use. Finally, we will fully develop the device and proceed to clinical implementation.
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Bibliography

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[10] Z. Liao, L. Yao, Z. Lu, and J. Zhang. Screw theory based mathematical modeling and kinematic analysis of a novel ankle rehabilitation robot with a constrained 3-PSP mechanism topology. International Journal of Intelligent Robotics and Applications, 2(3):351–360, 2018. doi: 10.1007/s41315-018-0063-9.
[11] C.C.K. Lin, M.S. Ju, S.M. Chen, and B.W. Pan. A specialized robot for ankle rehabilitation and evaluation. Journal of Medical and Biological Engineering, 28(2):79–86, 2008.
[12] Z. Sun et al. Mechanism Design and ADAMS-MATLAB-Simulation of a Novel Ankle Rehabilitation Robot. 2019 IEEE International Conference on Robotics and Biomimetic (ROBIO), pages 425–432, Dali, China, December, 2019. doi: 10.1109/robio49542.2019.8961829.
[13] Q. Liu, A. Liu, W. Meng, Q. Ai, and S.Q. Xie. Hierarchical compliance control of a soft ankle rehabilitation robot actuated by pneumatic muscles. Frontiers in Neurorobotics, 11:64, 2017. doi: 10.3389/fnbot.2017.00064.
[14] T. Yonezawa, K. Nomura, T. Onodera, S. Ishimura, H. Mizoguchi, and H. Takemura. Evaluation of venous return in lower limb by passive ankle exercise performed by PHARAD. 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), pages 3582–3585, Milan, Italia, 25–29 August, 2015. doi: 10.1109/embc.2015.7319167.
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[16] D. Ao, R. Song, and J. Gao. Movement performance of human–robot cooperation control based on emg-driven hill-type and proportional models for an ankle power-assist exoskeleton robot. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 25(8):1125–1134, 2017. doi: 10.1109/tnsre.2016.2583464.
[17] Y. Ren, Y.-N. Wu, C.-Y. Yang, T. Xu, R. L. Harvey, and L.-Q. Zhang. Developing a wearable ankle rehabilitation robotic device for in-bed acute stroke rehabilitation. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 25(6):589–596, 2017. doi: 10.1109/tnsre.2016.2584003.
[18] G. Aguirre-Ollinger, J.E. Colgate, M.A. Peshkin, and A. Goswami. Design of an active one-degree-of-freedom lower-limb exoskeleton with inertia compensation. The International Journal of Robotics Research, 30(4):486–499, 2011. doi: 10.1177/0278364910385730.
[19] Z. Zhou, Y. Sun, N. Wang, F. Gao, K. Wei, and Q. Wang. Robot-assisted rehabilitation of ankle plantar flexors spasticity: a 3-month study with proprioceptive neuromuscular facilitation. Frontiers in Neurorobotics, 10:16, 2016. doi: 10.3389/fnbot.2016.00016.
[20] I. Doroftei, C.M. Racu, C. Honceriu, and D. Irimia. One-degree-of freedom ankle rehabilitation platform. IOP Conference Series: Materials Science and Engineering, 591:012076, 2019. doi: 10.1088/1757-899x/591/1/012076.
[21] A. Gmerek and E. Jezierski. Admittance control of a 1-DoF robotic arm actuated by BLDC motor. 2012 17th International Conference on Methods & Models in Automation & Robotics (MMAR), pages 633–638, Miedzyzdroje, Poland, 27–30 August, 2012. doi: 10.1109/mmar.2012.6347811.
[22] Ł. Woliński. Comparison of the adaptive and neural network control for LWR 4+ manipulators: simulation study. Archive of Mechanical Engineering, 67(1):111–121, 2020. doi: 10.24425/ame.2020.131686.
[23] Meera C S, M.K. Gupta, and S. Mohan. Disturbance observer-assisted hybrid control for autonomous manipulation in a robotic backhoe. Archive of Mechanical Engineering, 66(2):153–169, 2019. doi: 10.24425/ame.2019.128442.
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[25] S. Singh, M.S. Qureshi, and P. Swarnkar. Comparison of conventional PID controller with sliding mode controller for a 2-link robotic manipulator. 2016 International Conference on Electrical Power And Energy System (ICEPES), pages 115–119, Bhopal, India, 14-16 December, 2016. doi: 10.1109/icepes.2016.7915916.
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[28] T. Eiammanussakul and V. Sangveraphunsiri. A lower limb rehabilitation robot in sitting position with a review of training activities. Journal of Healthcare Engineering, 2018:927807, 2018. doi: 10.1155/2018/1927807.
[29] A. Roy, H.I. Krebs, C.T. Bever, L.W. Forrester, R.F. Macko, and N. Hogan. Measurement of passive ankle stiffness in subjects with chronic hemiparesis using a novel ankle robot. Journal of Neurophysiology, 105(5):2132–2149, 2011. doi: 10.1152/jn.01014.2010.
[30] F. Gao, Y. Ren, E.J. Roth, R. Harvey, and L.-Q. Zhang. Effects of repeated ankle stretching on calf muscle–tendon and ankle biomechanical properties in stroke survivors. Clinical Biomechanics, 26(5):516–522, 2011. doi: 10.1016/j.clinbiomech.2010.12.003.
[31] G. Bucca, A. Bezzolato, S. Bruni and F. Molteni. A Mechatronic Device for the Rehabilitation of Ankle Motor Function. Journal of Biomechanical Engineering, 131(12):125001, 2009. doi: 10.1115/1.4000083.
[32] J. Zhong, Y. Zhu, C. Zhao, Z. Han, and X. Zhang. Position tracking of a pneumatic-muscle-driven rehabilitation robot by a single neuron tuned pid controller. Complexity, 2020:438391, 2020. doi: 10.1155/2020/1438391.
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Authors and Affiliations

Minh Duc Dao
1
ORCID: ORCID
Xuan Tuy Tran
2
Dang Phuoc Pham
1
Quoc Anh Ngo
1
Thi Thuy Tram Le
3

  1. Faculty Technology and Engineering, The Pham Van Dong University, Quang Ngai, Vietnam
  2. Faculty Technology of Mechanical Engineering, The University of Danang – University of Science and Technology, Danang, Vietnam
  3. The Faculty Electronic-Electrical, The Quang Nam College, Quang Nam, Vietnam
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Abstract

Biogas is a gaseous biofuel predominantly composed of methane and carbon-dioxide. Stability of biogas flames strongly depend upon the amount of carbon-dioxide present in biogas, which varies with the source of biomass and reactor. In this paper, a comprehensive study on the stability and flame characteristics of coflow biogas diffusion flames is reported. Numerical simulations are carried out using reactive flow module in OpenFOAM, incorporated with variable thermophysical properties, Fick’s and Soret diffusion, and short chemical kinetics mechanism. Effects of carbon-dioxide content in the biogas, temperatures of the fuel or coflowing air streams (preheated reactant) and hydrogen addition to fuel or air streams are analyzed. Entropy generation in these flames is also predicted. Results show that the flame temperature increases with the degree of preheat of reactants and the flames show better stability with the preheated air stream. Preheating the air contributes to increased flame stability and also to a significant decrease in entropy generation. Hydrogen addition, contributing to the same power rating, is seen to be relatively more effective in increasing the flame stability when added to the fuel stream. Results in terms of flow, temperature, species and entropy fields, are used to describe the stability and flame characteristics.
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Authors and Affiliations

R. Nivethana Kumar
1
S. Muthu Kumaran
1
Vasudevan Raghavan
1

  1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai – 600036, India
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Abstract

This paper concerns the analytical investigation of the axisymmetric and steady flow of incompressible couple stress fluid through a rigid sphere embedded in a porous medium. In the porous region, the flow field is governed by Brinkman's equation. Here we consider uniform flow at a distance from the sphere. The boundary conditions applied on the surface of the sphere are the slip condition and zero couple stress. Analytical solution of the problem in the terms of stream function is presented by modified Bessel functions. The drag experienced by an incompressible couple stress fluid on the sphere within the porous medium is calculated. The effects of the slip parameter, the couple stress parameter, and permeability on the drag are represented graphically. Special cases of viscous flow through a sphere are obtained and the results are compared with earlier published results.
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Authors and Affiliations

Krishna Prasad Madasu
1
ORCID: ORCID
Priya Sarkar
1
ORCID: ORCID

  1. Department of Mathematics, National Institute of Technology, Raipur-492010, Chhattisgarh, India
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Abstract

The Inconel 718 alloys, which are primarily temperature resistant, are widely used in aviation, aerospace and nuclear industries. The study on dry cutting processes for this alloy becomes difficult due to its high hardness and low thermal conductivity, wherein, most of the heat transfers due to friction are accumulated over the tool surface. Further, several challenges like increased cutting force, developing high temperature and rapid tool wear are observed during its machining process. To overcome these, the coated tool inserts are used for machining the superalloys. In the present work, the cemented carbide tool is coated with chemical vapor deposition multi-layering Al 2O 3/TiCN under the dry cutting environment. The machining processes are carried out with varying cutting speeds: 65, 81, 95, and 106 m/min, feed rate 0.1 mm/rev, and depth of cut 0.2 mm. The variation in the cutting speeds can attain high temperatures, which may activate built-up-edge development which leads to extensive tool wear. In this context, the detailed chip morphology and its detailed analysis are carried out initially to understand the machining performance. Simultaneously, the surface roughness of the machined surface is studied for a clear understanding of the machining process. The potential tool wear mechanism in terms of abrasion, adhesion, tool chip off, delaminating of coating, flank wear, and crater wear is extensively identified during the processes. From the results, it is observed that the machining process at 81 m/min corresponds to a better machining process in terms of lesser cutting force, lower cutting temperature, better surface finish, and reduced tool wear than the other machining processes.
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Authors and Affiliations

Shailesh Rao Agari
1

  1. Department of Industrial and Production Engineering, The National Institute of Engineering, Mysuru, Karnataka, India
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Abstract

The present study investigates the 2D numerical analogies to the changes of the droplet shapes during the freefall for a wide range of droplet sizes through the stagnation air. The freefall velocity, shape change due to frictional force during free-fall is studied for different considered cases. With the elapse of time, a droplet with a larger initial diameter is changing its original shape more compared to droplets with a smaller diameter. In addition, the spreading of the droplet during the freefall seems more rapid for the larger-diameter droplet. When a droplet with an initial diameter of 15 mm starts to fall with gravitational force, the diameter ratio is decreasing for droplets with higher density and surface tension while droplets having lower density and surface tension show a diameter ratio greater than one. The spreading and splashing of the droplet on a solid surface and liquid storage at the time of impact are much influenced by the freefall memories of the droplet during the freefall from a certain height. These freefall memories are influenced by the fluid properties, drag force, and the freefall height. However, these freefall memories eventually regulate the deformation of the droplet during the freefall.
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Authors and Affiliations

Abid Hasan Rafi
1
ORCID: ORCID
Mohammad Rejaul Haque
1
ORCID: ORCID
Dewan Hasan Ahmed
1
ORCID: ORCID

  1. Department of Mechanical and Production Engineering, Ahsanullah University of Science and Technology, Dhaka, Bangladesh
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Abstract

The phase change materials (PCM) are widely used in several applications, especiallyi n the latent heat thermal energy storage system (LHTESS). Due to the very low thermal conductivity of PCMs. A small mass fraction of hybrid nanoparticles TiO 2–CuO (50%–50%) is dispersed in PCM with five mass concentrations of 0%, 0.25%, 0.5%, 0.75% and 1 mass % to improve its thermal conductivity. This article is focused on thermal performance of the hybrid nano-PCM (HNPCM) used for the LHTESS. A numerical model based on the enthalpy-porosity technique is developed to solve the Navier-Stocks and energy equations. The computations were conducted for the melting and solidification processes of the HNPCM in a shell and tube latent heat storage (LHS). The developed numerical model was validated successfully with experimental data from the literature. The results showed that the dispersed hybrid nanoparticles improved the effective thermal conductivity and density of the HNPCM. Accordingly, when the mass fraction of a HNPCM increases by 0.25%, 0.5%, 0.75% and 1 mass %, the average charging time improves by 12.04 %, 19.9 %, 23.55%, and 27.33 %, respectively. Besides, the stored energy is reduced by 0.83%, 1.67%, 2.83% and 3.88%, respectively. Moreover, the discharging time was shortened by 18.47%, 26.91%, 27.71%, and 30.52%, respectively.
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Authors and Affiliations

Mohamed Lamine Benlekkam
1 2
ORCID: ORCID
Driss Nehari
3
ORCID: ORCID

  1. Department of Science and Technology, University of Tissemsilt, Tissemsilt, Algeria
  2. Laboratory of Smart Structure, University of Ain Temouchent, Ain Temouchent, Algeria
  3. Laboratory of Hydrology and Applied Environment, University of Ain Temouchent, Algeria
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Abstract

Functionally Graded Materials (FGM) are extensively employed for hip plant component material due to their certain properties in a specific design to achieve the requirements of the hip-joint system. Nevertheless, if there are similar properties, it doesn’t necessarily indicate that the knee plant is efficiently and effectively working. Therefore, it is important to develop an ideal design of functionally graded material femoral components that can be used for a long period. A new ideal design of femoral prosthesis can be introduced using functionally graded fiber polymer (FGFP) which will reduce the stress shielding and the corresponding stresses present over the interface. Herein, modal analysis of the complete hip plant part is carried out, which is the main factor and to date, very few research studies have been found on it. Moreover, this enhances the life of hip replacement, and the modal, harmonic, and fatigue analysis determines the pre-loading failure phenomena due to the vibrational response of the hip. This study deals with the cementless hip plant applying the finite element analysis (FEA) model in which geometry is studied, and the femoral bone model is based in a 3D scan.
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Authors and Affiliations

Saeed Asiri
1
ORCID: ORCID

  1. Mechanical Engineering Department, Engineering College King Abdulaziz University, Jeddah, Saudi Arabia
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Abstract

Digital image correlation (DIC) is a powerful full-field displacement measurement technique that has been used in various studies. The first step in the DIC is to create a random speckle pattern, where the spraying method is usually employed. However, creating an optimal pattern and modification in the spraying method is not convenient. Furthermore, the size of speckles which is not so small in spraying method, limits the minimum size of the field of study. In the present research, a convenient novel technique was introduced and investigated to generate a practical kind of speckle pattern with small speckles for evaluating smaller fields of view using nanoparticles. The pattern was created by spreading a mixture of different black and white nanoparticles. To this end, the black graphene oxide particles were mixed with white nanoparticles of titanium oxide, zirconium oxide and silicon to obtain three mixtures. Displacement tests show that the mixture of graphene and titanium provides the best DIC performance. More granularly, graphene and titanium were mixed at three different ratios to find the optimal combination. Subsequently, the accuracy of the new patterning method was analyzed via tensile testing and the results were compared against those of conventional method with various subset sizes.
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Authors and Affiliations

Milad Zolfipour Aghdam
1
ORCID: ORCID
Naser Soltani
1
Hadi Nobakhti
1

  1. School of Mechanical Engineering, Collegeof Engineering, University of Tehran, Iran
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Abstract

Production and assessment of artillery firing tables (FT) are the key tasks in solving ballistic problems through both standard and non-standard firing conditions. According to the literature, two different standard firing table formats were developed by the former-Soviet and the United States armies. This study proposes the main difference between these FT formats, as the standard meteorological conditions. An accuracy assessment has been proposed to justify different sources of errors through modeling and production of such tables, including applied meteorological message, aiming angles round-off, linear superposition principle, and Earth approximation. A~case study has been proposed for the 155M107 projectile to demonstrate the impact of the Coriolis effect as well as other ballistic and atmospheric non-standard conditions. As a part of the construction of artillery FT, a fitting process has to be made between available firing data and simulations. Therefore, a parametric study is implemented to study the number of test elevations per charge needed through the fitting process and its corresponding production error. Hence, based on the number of test elevations available, the genetic algorithm (GA) has been utilized to obtain the test elevations order needed with minimum FT production error. The results show a good agreement with the data stated in the literature.
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Authors and Affiliations

Mostafa Khalil
1
ORCID: ORCID

  1. Aerospace Engineering Department, Military Technical College, Cairo, Egypt
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Abstract

The aim of this study was to determine how the change of glass laminate fibres to flax fibres will affect the stability of thin-walled angle columns. Numerical analyses were conducted by the finite element method. Short L-shaped columns with different configurations of reinforcing fibres and geometric parameters were tested. The axially compressed structures were simply supported on both ends. The lowest two bifurcation loads and their corresponding eigenmodes were determined. Several configurations of unidirectional fibre arrangement were tested. Moreover, the influence of a flange width change by ±100% and a column length change by ±33% on the bifurcation load of the compressed structure was determined. It was found that glass laminate could be successfully replaced with a bio-laminate with flax fibres. Similar results were obtained for both materials. For the same configuration of fibre arrangement, the flax laminate showed a lower sensitivity to the change in flange width than the glass material. However, the flax laminate column showed a greater sensitivity to changes in length than the glass laminate one. In a follow-up study, selected configurations will be tested experimentally.
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Authors and Affiliations

Jarosław Gawryluk
1
ORCID: ORCID

  1. Department of Applied Mechanics, Faculty of Mechanical Engineering, Lublin University of Technology, Lublin, Poland
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Abstract

Water resources are the main component of natural systems affected by climate change in the Middle East. Due to a lack of water, steam power plants that use wet cooling towers have inevitably reduced their output power. This article investigates the replacement of wet cooling towers in Isfahan Thermal Power Plant (ITPP) with Heller natural dry draft cooling towers. The thermodynamic cycle of ITPP is simulated and the effect of condenser temperature on efficiency and output power of ITPP is evaluated. For various reasons, the possibility of installing the Heller tower without increasing in condenser temperature and without changing the existing components of the power plant was rejected. The results show an increase in the condenser temperature by removing the last row blades of the low-pressure turbine. However, by replacing the cooling tower without removing the blades of the last row of the turbine, the output power and efficiency of the power plant have decreased about 12.4 MW and 1.68 percent, respectively.
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Authors and Affiliations

Mohamad Hasan Malekmohamadi
1 2
Hossein Ahmadikia
1
ORCID: ORCID
Siavash Golmohamadi
2
Hamed Khodadadi
3

  1. University of Isfahan, Isfahan, Iran
  2. Isfahan Thermal Power Plant, Isfahan, Iran
  3. Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran
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Abstract

The problem of optimal design of symmetrical double-lap adhesive joint is considered. It is assumed that the main plate has constant thickness, while the thickness of the doublers can vary along the joint length. The optimization problem consists in finding optimal length of the joint and an optimal cross-section of the doublers, which provide minimum structural mass at given strength constraints. The classical Goland-Reissner model was used to describe the joint stress state. A corresponding system of differential equations with variable coefficients was solved using the finite difference method. Genetic optimization algorithm was used for numerical solution of the optimization problem. In this case, Fourier series were used to describe doubler thickness variation along the joint length. This solution ensures smoothness of the desired function. Two model problems were solved. It is shown that the length and optimal shape of the doubler depend on the design load.
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Authors and Affiliations

Sergei Kurennov
1
ORCID: ORCID
Konstantin Barakhov
1
ORCID: ORCID
Olexander Polyakov
1
ORCID: ORCID
Igor Taranenko
1
ORCID: ORCID

  1. National Aerospace University “Kharkiv Aviation Institute”, Kharkiv, Ukraine
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Abstract

In such applications as in the case of feeders in which a slider-crank mechanism equipped with a rotational spring on its crank is driven by a constant force and a lumped mass at the crank-connecting rod joint center, the slider is required to take on desired speeds and displacements. For this purpose, after obtaining and solving the dynamic model of the slider-crank mechanism, the output of this model is subjected to a modified Hooke-Jeeves method resulting in the development of a procedure for the optimization of selected set of operating parameters. The basic contribution involved in the so-called Hooke-Jeeves method is the procedure by which a cost-effective advancement towards a target optimum point is accomplished in a very short time. A user-friendly interface has also been constructed to support this procedure. The optimization procedure has been illustrated on a numerical example. The validation of the resulting dynamic model has also been demonstrated.
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Authors and Affiliations

Mehmet Ilteris Sarigecili
1
ORCID: ORCID
Ibrahim Deniz Akcali
1
ORCID: ORCID

  1. Department of Mechanical Engineering, Çukurova University, Adana, Turkey
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Abstract

The automotive industry requires more and more light materials with good strength and formability at the same time. The answer to this type of demands are, among others, aluminium alloys of the 6xxx series, which are characterized by a high strength-to-weight ratio and good corrosion resistance. Different material state can affect formability of AlMgSi sheets. These study analysed the influence of heat treatment conditions on the drawability of the sheet made of 6082 aluminium alloy. The studies on mechanical properties and plastic anisotropy for three orientations (0, 45, 90°) with respect to the rolling direction were carried out. The highest plasticity was found for the material in the 0 temper condition. The influence of heat treatment conditions on the sheet drawability was analysed using the Erichsen, Engelhardt-Gross, Fukui and AEG cupping tests. It was found that the material state influenced the formability of the sheet. In the case of bulging, the sheet in the annealed state was characterized by greater drawability, and in the deep drawing process, greater formability was found for the naturally aged material.
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Authors and Affiliations

Łukasz Kuczek
1
ORCID: ORCID
Marcin Mroczkowski
1
ORCID: ORCID
Paweł Turek
1

  1. AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Cracow, Poland
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Abstract

This paper discusses the different methods used for calculating first- and second-order sensitivity: the direct differentiation method, the adjoint variables method, and the hybrid method. The solutions obtained allow determining the sensitivity of dynamic characteristics such as eigenvalues and eigenvectors, natural frequencies, and nondimensional damping ratios. The methods were applied for analyzing systems with viscoelastic damping elements, whose behavior can be described by classical and fractional rheological models. However, the derived formulas are general and can also be applied to systems with damping elements described by other models. Their advantage is a compact and easy to code form. The paper also presents a comparison of the computational costs of the discussed methods. The correctness of all the proposed methods has been illustrated with numerical examples.
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Authors and Affiliations

Magdalena Łasecka-Plura
1
ORCID: ORCID

  1. Poznan University of Technology, Institute of Structural Analysis, Poznan, Poland
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Abstract

Titanium alloys are difficult-to-machine materials due to their complex mechanical and thermophysical properties. An essential factor in ensuring the quality of the machined surface is the analysis and recommendation of vibration processes accompanying cutting. The analytical description of these processes for machining titanium alloys is very complicated due to the complex adiabatic shear phenomena and the specific thermodynamic state of the chip-forming zone. Simulation modeling chip formation rheology in Computer-Aided Forming systems is a practical method for studying these phenomena. However, dynamic research of the cutting process using such techniques is limited because the initial state of the workpiece and tool is a priori assumed to be "rigid", and the damping properties of the fixture and machine elements are not taken into account at all. Therefore, combining the results of analytical modeling of the cutting process dynamics with the results of simulation modeling was the basis for the proposed research methodology. Such symbiosis of different techniques will consider both mechanical and thermodynamic aspects of machining (specific dynamics of cutting forces) and actual conditions of stiffness and damping properties of the “Machine-Fixture-Tool-Workpiece” system.
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Authors and Affiliations

Vadym Stupnytskyy
1
ORCID: ORCID
She Xianning
1
ORCID: ORCID
Yurii Novitskyi
1
ORCID: ORCID
Yaroslav Novitskyi
1
ORCID: ORCID

  1. Lviv Polytechnic National University, Lviv, Ukraine
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Abstract

Unmanned, battery-powered quadrotors have a limited onboard energy resources. However, flight duration might be increased by reasonable energy expenditure. A reliable mathematical model of the drone is required to plan the optimum energy management during the mission. In this paper, the theoretical energy consumption model was proposed. A small, low-cost DJI MAVIC 2 Pro quadrotor was used as a test platform. Model parameters were obtained experimentally in laboratory conditions. Next, the model was implemented in MATLAB/Simulink and then validated using the data collected during real flight trials in outdoor conditions. Finally, the Monte-Carlo simulation was used to evaluate the model reliability in the presence of modeling uncertainties. It was obtained that the parameter uncertainties could affect the amount of total consumed energy by less than 8% of the nominal value. The presented model of energy consumption might be practically used to predict energy expenditure, battery state of charge, and voltage in a typical mission of a drone.
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Authors and Affiliations

Robert Głębocki
1
ORCID: ORCID
Marcin Żugaj
1
ORCID: ORCID
Mariusz Jacewicz
1
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Power and Aeronautical Engineering, Warsaw, Poland
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Abstract

This paper investigates the effect of friction on the buckling behavior of a thin, shallow, elastic spherical shell under uniform external pressure based on an axisymmetric model of the finite element method. The study examines a combination of different geometric parameters with three different types of boundary conditions: clamped, hinged, and frictional ends with a wide range of friction coefficients. Friction has a significant influence on the buckling response of the spherical shell for all geometric parameters. In general, the critical pressure decreases as the friction coefficient or geometric parameter decreases. The buckling behavior of the frictional end with small friction coefficients presents an obvious difference compared to the results of high coefficients. For certain geometric parameters, the buckling mode of the spherical shell is transited because of changing the friction coefficient. A buckling map that describes the dependence of critical pressure on both friction coefficient and geometric parameter combined with buckling mode is generated. This map can be applied to the design of the spherical shell against buckling.
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Authors and Affiliations

XuanCuong Nguyen
1 2
ORCID: ORCID
Yoshio Arai
1
Wakako Araki
3

  1. Saitama University, Saitama, Japan
  2. Hanoi University of Civil Engineering, Hanoi, Vietnam
  3. Tokyo Institute of Technology, Tokyo, Japan
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Abstract

This paper presents a study on the dry turning of polyoxymethylene copolymer POM-C. The effect of five factors (cutting speed, feed rate, depth of cut, nose radius, and main cutting edge angle) on machinability is evaluated using four output parameters: surface roughness, tangential force, cutting power, and material removal rate. To do so, the study relies on three approaches: (i) Pareto statistical analysis, (ii) multiple linear regression modeling, and (iii) optimization using the genetic algorithm. To conduct the investigation, mathematical models are developed using response surface methodology based on the Taguchi L16 orthogonal array. The results indicate that feed rate, nose radius, and cutting edge angle significantly influence surface quality, while depth of cut, feed, and speed have a notable impact on other machinability parameters. The developed mathematical models have determination coefficients greater than or very close to 95%, making them very useful for the industry as they allow predicting response values based on the chosen cutting parameters. Finally, the optimization using the genetic algorithm proves to be promising and effective in determining the optimal cutting parameters to maximize productivity while improving surface quality.
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Authors and Affiliations

Tallal Hakmi
ORCID: ORCID
Amine Hamdi
ORCID: ORCID
Youssef Touggui
ORCID: ORCID
Aissa Laouissi
ORCID: ORCID
Salim Belhadi
ORCID: ORCID
Mohamed Athmane Yallese
ORCID: ORCID
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Abstract

The subject of the work is a five-layered composite beam with clamped ends subjected to a uniformly distributed load along its length. Two analytical models of this beam are developed with consideration of the shear effect. The first model is formulated on the basis of the classical zig-zag theory. Whereas, the second model is developed using an individual nonlinear shear deformation theory with consideration of the classical shear stress formula (called Zhuravsky shear stress). The system of two differential equations of equilibrium for each beam model is obtained based on the principle of stationary total potential energy. These systems of equations are exactly analytically solved. The shear effect function and the maximum deflection are determined for each of these two beam models. Detailed calculations are carried out for exemplary beams of selected dimensionless sizes and material constants. The main goal of the research is to develop two analytical models of this beam, determine the shear effect function, the shear coefficient, and the maximum deflection in the elastic range for each model, as well as to perform a comparative analysis.
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Authors and Affiliations

Krzysztof Magnucki
1
ORCID: ORCID

  1. Łukasiewicz Research Network, Poznan Institute of Technology, Poznan, Poland
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Abstract

In this work, a novel perspective is proposed to develop schematics solutions for electro-hydraulic positioning actuators. The basis of the design approach has been established, which includes: a set of possible desired properties of actuators; a series of defined typical positioning methods; variants of schematic structures; a quantitative assessment method for specific properties based on influencing factors; the quantitative relationship between the structure and properties of actuators, as well as the method for overall evaluation of the actuator's performance based on the total score. The results obtained can serve as the basis for an effective design approach, which allows for reducing the number of iteration cycles while developing new electro-hydraulic positioning actuator schematic solutions.
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Authors and Affiliations

Qiang Li
1
ORCID: ORCID
Oleksandr Uzunov
1
ORCID: ORCID

  1. Department of Fluid Mechanics and Mechatronics, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
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Abstract

The main goal of the research presented in this paper is to find an analytical solution for an electromagnetic energy harvester with double magnet. A double magnet configuration is defined as a structure in which two magnets, either attracting or repelling, are positioned at a constant distance from each other. Analytical dependencies that govern the shape of electromechanical coupling coefficient curves for various double magnet configurations are provided. In the subsequent step of the analysis, resonance curves for its vibrations and the corresponding recovered energy were determined for the selected dual magnet settings using the harmonic balance method. These characteristics enabled us to ascertain the optimal resistance and estimate the maximum electrical power that can be harvested from the vibrations of the double magnets.
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Authors and Affiliations

Andrzej Mirura
1
ORCID: ORCID
Krzysztof Kecik
1
ORCID: ORCID

  1. Lublin University of Technology, Faculty of Mechanical Engineering, Department of Applied Mechanics, Lublin, Poland
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Abstract

Medical applications of additive manufacturing have seen a significant growth in recent years due to availability of advanced medical imaging and design software and wide range of materials. The range of additively manufactured medical implants is growing rapidly and surgeons need to keep themselves updated with state-of-the-art of the technology. This article reviews several articles related to medical implants to help surgeons and researchers to stay up-to-date on recent developments in the domain. Additively manufactured medical implants are reviewed into five categories: orthopedic implants, dental implants, cranioplasty implants, scaffold implants for tissue engineering and other medical implants including chest wall reconstructive implants, anti-migration enhanced tracheal stents, and buccopharyngeal stents. Additive manufacturing process and material for fabrication of each type of implant are highlighted in the study. It has been observed that titanium alloy is a suitable material for cementless arthroplasty. Porosity in the implants supports bone ingrowth, which results in a significant reduction in stress shielding. Additive manufacturing has a very attractive future in medical implant fabrication due to its capability to produce complex and customized implants. The AM provides freedom to researcher to explore the complex design of medical implants for better bone regeneration and improved osseointegration.
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Authors and Affiliations

Hari Narayan Singh
1
ORCID: ORCID
Sanat Agrawal
1
ORCID: ORCID
Yashwant Kumar Modi
2
ORCID: ORCID

  1. Department of Mechanical Engineering, National Institute of Technology, Uttarakhand, India
  2. Department of Mechanical Engineering, Jaypee University of Engineering and Technology, Guna, India
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Abstract

This paper aims to develop new highly efficient PSC-algorithms (algorithms that contain a polynomial-time sub-algorithm with sufficient conditions for the optimality of the solutions obtained) for several interrelated problems involving identical parallel machine scheduling. These problems share common basic theoretical positions and common principles of their solving. Two main intractable scheduling problems are considered: (“Minimization of the total tardiness of jobs on parallel machines with machine release times and a common due date” (TTPR) and “Minimising the total tardiness of parallel machines completion times with respect to the common due date with machine release times” (TTCR)) and an auxiliary one (“Minimising the difference between the maximal and the minimal completion times of the machines” (MDMM)). The latter is used to efficiently solve the first two ones. For the TTPR problem and its generalisation in the case when there are machines with release times that extend past the common due date (TTPRE problem), new theoretical properties are given, which were obtained on the basis of the previously published ones. Based on the new theoretical results and computational experiments the PSC-algorithm solving these two problems is modified (sub-algorithms A1, A2). Then the auxiliary problem MDMM is considered and Algorithm A0 is proposed for its solving. Based on the analysis of computational experiments, A0 is included in the PSC-algorithm for solving the problems TTPR, TTPRE as its polynomial component for constructing a schedule with zero tardiness of jobs if such a schedule exists (a new third sufficient condition of optimality). Next, the second intractable combinatorial optimization problem TTCR is considered, deducing its sufficient conditions of optimality, and it is shown that Algorithm A0 is also an efficient polynomial component of the PSC-algorithm solving the TTCR problem. Next, the case of a schedule structure is analysed (partially tardy), in which the functionals of the TTPR and TTCR problems become identical. This facilitates the use of Algorithm A1 for the TTPR problem in this case of the TTCR problem. For Algorithm A1, in addition to the possibility of obtaining a better solution, there exists a theoretically proven estimate of the deviation of the solution from the optimum. Thus, the second PSC-algorithm solving the TTCR problem finds an exact solution or an approximate solution with a strict upper bound for its deviation from the optimum. The practicability of solving the problems under consideration is substantiated.
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Authors and Affiliations

Sergii Telenyk
1
ORCID: ORCID
Grzegorz Nowakowski
1
ORCID: ORCID
Oleksandr Pavlov
2
ORCID: ORCID
Olena Misura
2
ORCID: ORCID
Oleg Melnikov
2
ORCID: ORCID
Olena Khalus
2
ORCID: ORCID

  1. Faculty of Electrical and Computer Engineering, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland
  2. National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Prosp. Peremohy 37, Kyiv, Ukraine

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