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Minimization of oscillations of the tower crane slewing mechanism in the steady-state mode of trolley movement

Viacheslav Loveikin Yuriy Romasevych Andrii Loveilin Mykola Korobko Anastasia Liashko

Archive of Mechanical Engineering | 2023 | vol. 70 | No 3 | 367-385 | DOI: 10.24425/ame.2023.146847

Keywords crane optimization constraint oscillations control

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Abstract

In the present study, the problem of optimization of the motion mode of the tower crane's slewing mechanism in the steady-state mode of trolley movement is stated and solved. An optimization criterion, which includes the RMS values of the drive torque and the rate of its change over time, is minimized. The optimization is carried out taking into account the drive torque constraints, and under the specified boundary conditions of motion. Three optimization problems at different values of the weight coefficients are solved. In the first problem, priority is given to the drive torque, in the third – to the rate of the drive torque change, and in the second problem, the significance of both components is assumed equal. The optimization problems are nonlinear, thus a VСT-PSO method is applied to solve them. The obtained optimal start-up modes of the crane slewing mechanism eliminate pendulum load oscillations and high-frequency elastic oscillations of the tower. Most of the kinematic, dynamical, and power parameters at different values of the weight coefficients are quite close to each other. It indicates that the optimal modes of motion are significantly influenced by the boundary conditions, optimization parameters, and constraints

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Bibliography

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Authors and Affiliations

Viacheslav Loveikin

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Yuriy Romasevych

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Andrii Loveilin

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Mykola Korobko

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Anastasia Liashko

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National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine
Taras Shevchenko National University of Kyiv, Ukraine

An approach to investigating the feasibility of free-space optical communication technology deployment under scintillation effects

Aras S. Mahmood

Opto-Electronics Review | 2023 | 31 | 3 | e147037 | DOI: 10.24425/opelre.2023.147037

Keywords free-space optical communication atmospheric turbulence scintillation attenuation refractive index structure parameter

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Abstract

Local weather conditions have an impact on the availability of free-space optical (FSO) communication. The variation in meteorological parameters, such as temperature, humidity, and wind speed, leads to variations of the refractive index along the transmission path. These refractive index inhomogeneities produced by atmospheric turbulence induce optical turbulence which is responsible for random fluctuations in the intensity of the laser beam that carries the signal (irradiance) called scintillations that can significantly degrade the performance of FSO systems. This paper aims to investigate the feasibility of deploying FSO communication technology under scintillation effects in any urban region and atmospheric environment. To achieve that, firstly by utilizing the Hufnagel-Vally day with the Sadot and Kopeika models together, the scintillation strength for a specified region, Sulaimani City in north-eastern Iraq as an example, has been estimated through the calculation of the refractive index structure parameter (Cn2) over a period of 10 years and it was found to be at the strong turbulence level. Secondly, from the same estimated parameter, the scintillation attenuation of the signal carrying the laser beam intensity can be calculated to investigate the feasibility of FSO communication using Optysistem-7 software. The optimal link distance for north-eastern Iraq (Sulaimani City) has been found to be within the limit of about 5.5 km. Analysing the max. Q-factor, bit-error rate and signal to noise ratio for an average of 120 months between 2013–2022 assessed the best and worst seasons for FSO.

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Authors and Affiliations

Aras S. Mahmood

Physics Department, College of Education, University of Sulaimani, Sulaimani, Kurdistan Region / Iraq

Detection system for a miniature MEMS X-ray source

Paweł Urbański Tomasz Grzebyk

Opto-Electronics Review | 2023 | 31 | 4 | e147028 | DOI: 10.24425/opelre.2023.147038

Keywords X-rays luminophore scintillator

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Abstract

The article presents the results of experiments on a detection system used for detecting signals from a miniature, low-energy micro-electro-mechanical system (MEMS) X-ray source. The authors propose to use a detection based on luminescence phenomena occurring in luminophore and scintillators to record the visual signal on a CMOS/CCD detector. The main part of the article is a review of various materials of scintillators and luminophores which would be adequate to convert low-energy X-ray radiation (E < 25 keV – it is a range not typical for conventional X-ray systems) to visible light. Measurements obtained for different energies, exposure times, and different targets have been presented and analysed.

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Authors and Affiliations

Paweł Urbański

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Tomasz Grzebyk

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Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technologyul. Janiszewskiego 11/17, 50-372 Wrocław, Poland

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Minimization of oscillations of the tower crane slewing mechanism in the steady-state mode of trolley movement

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Bibliography

Authors and Affiliations

An approach to investigating the feasibility of free-space optical communication technology deployment under scintillation effects

Abstract

Authors and Affiliations

Detection system for a miniature MEMS X-ray source

Abstract

Authors and Affiliations