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Designing Micro And Small Compliant Mechanism Using Topology Optimization

Posted on:2001-03-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z Y LiuFull Text:PDF
GTID:1102360002452111Subject:Mechanical Manufacturing and Automation
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MEMS is a developing research project which based on microelectrical technology and traditional mechanics. The main purpose of MEMS is exploring the new mechanical and electrical theory and founding a new research domain in microscope. Compared with traditional mechanism,micro and small compliant mechanism is a newly developing research scope in MEMS,which has particular advantages.This thesis investigates the design method of micro and small compliant mechanism using continuum topology optimization. For decreasing the computational scale,adjoint variable method is proposed to solve the sensitivity analysis based on FEM. Combined with fictitious design domain method,adaptive wavelet refinement method is proposed to avoid the computational prohibition when the computational quantity exponentially increases with the mesh refinement.From the point view of inverse PDE,the essence of numerical instabilities in topology optimization is given,including checkerboard pattern and mesh-dependence. Based on this explanation,a novel method-Gaussian window method and multi-grid method-are proposed. The effect and convergence of this method are also proved.After decreasing the computational scale and solving the numerical instabilities,we use the continuum topology optimization to design micro and small compliant mechanism. A multi-object optimization model is proposed,and some of compliant mechanisms are designed,such as small gripper,X-Y and Z-9 micro-displacement platform. At the same time,the topology optimization method about no-rib thin plate is also discussed.
Keywords/Search Tags:MEMS, compliant mechanism, topology optimization, wavelet multi-resolution, checkerboard pattern, mesh-dependence
PDF Full Text Request
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