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Abstract

The structural damages can lead to structural failure if they are not identified at early stages. Different methods for detecting and locating the damages in structures have been always appealing to designers in the field. Due to direct relation between the stiffness, natural frequency, and mode shapes in the structure, the modal parameters could be used for the purpose of detecting and locating the damages in structures. In the current study, a new damage indicator named “DLI” is proposed, using the mode shapes and their derivatives. A finite element model of a beam is used, and the numerical model is validated against experimental data. The proposed index is investigated for two beams with different support conditions and the results are compared with those of two well-known indices – MSEBI and CDF. To show the capability and accuracy of the proposed index, the damages with low severity at various locations of the structures containing the elements near the supports were investigated. The results under noisy conditions are investigated by considering 3% and 5% noise on modal data. The results show a high level of accuracy of the proposed index for identifying the location of the damaged elements in beams.
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Bibliography

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[16] S. Karimi, M. Bozorgnasab, R. Taghipour, and M. M. Alipour. A novel spring-based model for damage investigation of functionally graded beams. Journal of Solid Mechanics, 2021 (in print).
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[21] A. Esfandiari, F. Bakhtiari-Nejad, and A. Rahai. Theoretical and experimental structural damage diagnosis method using natural frequencies through an improved sensitivity equation. International Journal of Mechanical Sciences, 70:79–89, 2013. doi: 10.1016/j.ijmecsci.2013.02.006.
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Authors and Affiliations

Reza Taghipour
1
ORCID: ORCID
Mina Roodgar Nashta
1
ORCID: ORCID
Mohsen Bozorgnasab
2
ORCID: ORCID
Hessam Mirgolbabaei
3
ORCID: ORCID

  1. Department of Civil Engineering, University of Mazandaran, Babolsar, Iran.
  2. Department of Civil Engineering, University of Mazandaran, Babolsar, Iran
  3. Department of Mechanical and Industrial Engineering, University of Minnesota Duluth, Duluth, Minnesota, United States of America.
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Abstract

In this work, continuous third-order sliding mode controllers are presented to control a five degrees-of-freedom (5-DOF) exoskeleton robot. This latter is used in physiotherapy rehabilitation of upper extremities. The aspiration is to assist the movements of patients with severe motor limitations. The control objective is then to design adept controllers to follow desired trajectories smoothly and precisely. Accordingly, it is proposed, in this work, a class of homogeneous algorithms of sliding modes having finite-time convergence properties of the states. They provide continuous control signals and are robust regardless of non-modeled dynamics, uncertainties and external disturbances. A comparative study with a robust finite-time sliding mode controller proposed in literature is performed. Simulations are accomplished to investigate the efficacy of these algorithms and the obtained results are analyzed.
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Bibliography

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[14] A. Jebri, T. Madani, and K. Djouani. Adaptive continuous integral-sliding-mode controller for wearable robots: Application to an upper limb exoskeleton. In 2019 IEEE 16th International Conference on Rehabilitation Robotics (ICORR), pages 766–771, Toronto, Canada, 24-28 June 2019. doi: 10.1109/ICORR.2019.8779431.
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[22] R. Fellag, M. Hamerlain, S. Laghrouche, M. Guiatni, and N. Achour. Homogeneous finite time higher order sliding mode control applied to an upper limb exoskeleton robot. In 2019 6th International Conference on Control, Decision and Information Technologies (CoDIT), pages 355–360, Paris, France, 23-26 April 2019. doi: 10.1109/CoDIT.2019.8820676.
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Authors and Affiliations

Ratiba Fellag
1 3
ORCID: ORCID
Mohamed Guiatni
2
ORCID: ORCID
Mustapha Hamerlain
1
Noura Achour
3

  1. Centre de Développement des Technologies Avancées, Alger, Algérie.
  2. Laboratoire LCS^2, Ecole Militaire Polytechnique, Alger, Algérie.
  3. Laboratoire LRPE, Université des Sciences et de la Technologie Houari Boumediene, Alger, Algérie.
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Abstract

Vibrational stress relief (VSR) treatment as a method of stress relief is currently performed on different alloys and sizes as an appropriate alternative for thermal stress relief (TSR) method. Although many studies have been performed to extend the knowledge about this process, analytical studies in the field of VSR process seems to require wider efforts to introduce the concept more clearly and extensively. In this study, a theoretical model is proposed based on an analytical equation. The proposed equation was modified in terms of required variables including frequency, amplitude, and vibration duration to encompass more practical parameters compared to the previous models. Thus, essential VSR parameters including the number of cycles as a representative of treatment duration, strain rate as a representative of frequency, and the amplitude were embedded in the model to make it comprehensively practical. Experimental tests were also performed and residual stress distribution was measured by X-ray diffractometry (XRD) method for certain points to compare the experimental results with the theoretical output. An acceptable range of conformation was observed between theoretical and experimental results.
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Bibliography

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Authors and Affiliations

Mehdi Jafari Vardanjani
1
Jacek Senkara
2
ORCID: ORCID

  1. Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
  2. Department of Welding Engineering,Warsaw University of Technology,Warsaw, Poland.

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