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Abstract

Thermally induced free vibration of sandwich beams with porous functionally graded material core embedded between two isotropic face sheets is investigated in this paper. The core, in which the porosity phase is evenly or unevenly distributed, has mechanical properties varying continuously along with the thickness according to the power-law distribution. Effects of shear deformation on the vibration behavior are taken into account based on both third-order and quasi-3D beam theories. Three typical temperature distributions, which are uniform, linear, and nonlinear temperature rises, are supposed. A mesh-free approach based on point interpolation technique and polynomial basis is utilized to solve the governing equations of motion. Examples for specific cases are given, and their results are compared with predictions available in the literature to validate the approach. Comprehensive studies are carried out to examine the effects of the beam theories, porosity distributions, porosity volume fraction, temperature rises, temperature change, span-to-height ratio, different boundary conditions, layer thickness ratio, volume fraction index on the vibration characteristics of the beam.
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Authors and Affiliations

Tran Quang Hung
1
Tran Minh Tu
2
ORCID: ORCID
Do Minh Duc
1

  1. Faculty of Civil Engineering, The University of Da Nang - University of Science and Technology, Da Nang, Vietnam
  2. Hanoi University of Civil Engineering, Hanoi, Vietnam
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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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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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