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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Composite,tensile strength,Joint,metal,Comeld
- چکیده:
- چکیده انگلیسی: Comeld” is a novel technology which can be applied in connecting composites and metals by manufacture of an array of metal pins on the metal part and layup the composite layers on the pins to make an adhesive and mechanical Joint at the same time. The aim of this paper is an experimental, numerical and analytical investigation on strength of comeld joint system and also to calculate the stiffness properties of composite after comeld process. Experimental test were carried out with fabrication of 21 specimens of comeld and uncomeld joints with different geometry and arrays of pins. Samples were tested under pure tensile loading. For the numerical simulation and investigation, the commerical software ABAQUS has been used and the tensile test were carried out to model a 3D Simulation of the joints considering adhesive behaviour. The analytical investigation were focused on the calculation of laminate stiffness properties after comeld process and the results were calculated using MATLAB capabilities. The results of experimental tests showed a good agreement with those of numerical results. The results show that the comeld joint system has a high potential for effective joining of metal and composite.
- انتشار مقاله: 15-04-1395
- نویسندگان: Mohammad Moein Seif,Khodadad Vahedi,Erfan Ghiasi,Rouhollah Hosseini
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational and Applied Research in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Imperialist competitive algorithm,Multi-objective optimization,Parkinson's disease,Vibration Absorber,Random vibrations
- چکیده:
- چکیده انگلیسی: Because the underlying physiology of pathological tremor in a Parkinson's patient is not well understood, the existing physical and drug therapies have not been successful in tremor treatment. Different mathematical modeling of such vibration has been introduced to investigate the problem and reduce the existing vibration. Most of the models have represented the induced vibration as a sinusoidal wave for mathematical simplification. In this study, a more realistic model based on random vibration was used to attack the problem of tremor suppression. A simple approach for suppressing the tremor associated with Parkinson's disease was presented. This paper was concerned with a multi-objective approach for optimum design of linear vibration absorber subject to random vibrations. Analytical expressions, for the case of non-stationary white-noise accelerations, were also derived. The present approach was different from conventional optimum design criteria since it was based on minimizing displacement as well as accelerating variance of the main structure responses without considering performances required against discrepancy in response. In this study, in order to control the tremor induced on biomechanical arm model excited by non-stationary based acceleration random process, multi-objective optimization (MOO) design of a vibration absorber was developed and performed using modern imperialist competitive optimization algorithm for multi-objective optimization. The results demonstrated importance of this method and showed that multi-objective design methodology provided significant improvement in performance stability and giving better control of the design solution choice.
- انتشار مقاله: 27-02-1392
- نویسندگان: Rouhollah Hosseini,Keikhosrow Firoozbakhsh,Hossein Naseri
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: Resonant frequency,Vibration energy harvesting,Unimorph Piezoelectric vibrator,Trapezoidal V-shaped cantilever,Triangular beam
- چکیده:
- چکیده انگلیسی: The most promising method for micro scale energy scavenging is via vibration energy harvesting which converts mechanical energy to electrical energy. Using piezoelectric cantilevers is the most common method for vibration energy harvesting. Changing the shape of the cantilevers can lead to changing the generated output voltage and power. In this work vibration energy harvesting via piezoelectric resonant unimorph cantilevers is studied and new design for obtaining more efficient piezoelectric energy harvester is suggested. This study provides comprehensive analysis of the output voltage relationships and deducing a considerable precise rule of thumb for calculating resonance frequency in cantilever-type unimorph piezoelectric energy harvesters using Rayleigh method. The analytical formula, is then analyzed and verified by FEM simulation in ABAQUS. The analytical data was found to be very close to simulation data. A key finding is that among all the unimorph trapezoidal V-shaped cantilever beams with uniform thickness, the triangular tapered cantilever, can lead to highest resonance frequency and by increasing the ratio of the trapezoidal bases, the resonance frequency decreases. These new findings provide guidelines on system parameters that can be manipulated for more efficient performance in different ambient source conditions.
- انتشار مقاله: 22-07-1395
- نویسندگان: Rouhollah Hosseini,Maryam Nouri
- مشاهده