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Technical Brief

A Topology Optimization Method With Constant Volume Fraction During Iterations for Design of Compliant Mechanisms

[+] Author and Article Information
Chih-Hsing Liu

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: chliu@mail.ncku.edu.tw

Guo-Feng Huang

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan

Manuscript received September 13, 2015; final manuscript received February 13, 2016; published online March 18, 2016. Assoc. Editor: Xilun Ding.

J. Mechanisms Robotics 8(4), 044505 (Mar 18, 2016) (7 pages) Paper No: JMR-15-1256; doi: 10.1115/1.4032812 History: Received September 13, 2015; Revised February 13, 2016

This study presents a topology optimization method for design of complaint mechanisms with maximum output displacement as the objective function. Unlike traditional approaches, one special characteristic of this method is that the volume fraction, which is defined as the calculated volume divided by the full volume, remains the same value throughout the optimization process based on the proposed pseudodensity and sensitivity number update scheme. The pseudodensity of each element is initially with the same value as the prespecified volume fraction constraint and can be decreased to a very small value or increased to one with a small increment. Two benchmark problems, the optimal design of a force–displacement inverter mechanism and a crunching mechanism, are provided as the illustrative examples to demonstrate the effectiveness of the proposed method. The results agree well with the previous studies. The proposed method is a general approach which can be used to synthesize the optimal designs of compliant mechanisms with better computational efficiency.

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Figures

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Fig. 1

Initial design domain with load scheme

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Fig. 2

(a) Input and (b) output load cases

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Fig. 3

Update scheme with constant volume fraction during iterations

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Fig. 4

Flowchart of the proposed topology optimization procedure

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Fig. 5

Force–displacement inverter mechanism: (a) analysis domain and (b) optimal topology

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Fig. 6

Topology optimization results for the inverter mechanism: (a) objective function and volume fraction calculated throughout iterations and (b) optimal topologies at specific iterations

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Fig. 7

Crunching mechanism: (a) analysis domain and (b) optimal topology

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Fig. 8

Topology optimization results for the crunching mechanism: (a) objective function and volume fraction calculated throughout iterations and (b) optimal topologies at specific iterations

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