Topological design of pressure-actuated compliant mechanisms considering minimum length scale control
Pressure-actuated compliant mechanisms obtained by topology optimization are prone to de facto hinges,which may cause manufacturing difficulties.To meet the requirements of manufacturing process,a method for to-pology optimization of pressure-actuated compliant mechanisms with minimum length scale control was proposed.By using the improved solid isotropic material with penalization model,the fluid pressure loads was calculated with Dar-cy's law and the drainage term.The maximization of mutual strain energy and the minimization of strain energy for compliant mechanisms were developed as multi-objective functions.The skeleton features of compliant mechanisms were extracted by Otsu algorithm and topology refinement algorithm,and the minimum length scale control was constructed.The structural volume and minimum characteristic size were employed as constraints.The model for topology optimization of pressure-actuated compliant mechanisms with minimum length scale control was estab-lished.The method of moving asymptotes algorithm was employed to solve the optimization problem for designing pressure-actuated compliant mechanisms.The results of numerical examples showed that the minimum length scale of the pressure-actuated compliant mechanisms obtained by the proposed method could be effectively controlled,and the effect of different minimum length scale control limits on the results was investigated.
compliant mechanismspressure loadstopology optimizationminimum length scale control
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