Large-stroke flexure mechanisms inherently lose stiffness in supporting directions when deflected. A systematic approach to synthesize such hinges is currently lacking. In this paper, a new building block-based spatial topology synthesis method is presented for optimizing large-stroke flexure hinges. This method consists of a layout variation strategy based on a building block approach combined with a shape optimization to obtain the optimal design tuned for a specific application. A derivative-free shape optimization method is adapted to include multiple system boundaries and constraints to optimize high complexity flexure mechanisms in a broad solution space. To obtain the optimal layout, three predefined three-dimensional (3D) “building blocks” are proposed, which are consecutively combined to find the best layout with respect to specific design criteria. More specifically, this new method is used to optimize a flexure hinge aimed at maximizing the frequency of the first unwanted vibration mode. The optimized topology shows an increase in frequency of a factor ten with respect to the customary three flexure cross hinge (TFCH), which represents a huge improvement in performance. The numerically predicted natural frequencies and mode shapes have been verified experimentally.
Building Block-Based Spatial Topology Synthesis Method for Large-Stroke Flexure Hinges
Manuscript received November 1, 2016; final manuscript received March 4, 2017; published online May 2, 2017. Assoc. Editor: Guimin Chen.
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Naves, M., Brouwer, D. M., and Aarts, R. G. K. M. (May 2, 2017). "Building Block-Based Spatial Topology Synthesis Method for Large-Stroke Flexure Hinges." ASME. J. Mechanisms Robotics. August 2017; 9(4): 041006. https://doi.org/10.1115/1.4036223
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