Investigation on contact-aided compliant mechanisms
Compliant mechanisms are the focus of active research because of the scalability, robustness, and ease of manufacture endowed by their unitized construction. Contact-aided compliant mechanisms [CCMs] use only elastic deformation and intermittent contacts to transmit force and motion and develop systematic methods to synthesize them.
The contact-induced unilateral displacement constraints that make this possible also give rise to non-differentiability in the optimization-based CCM synthesis problem. Consequently, smooth optimization algorithms that are proven to be efficient for compliant mechanism design become unsuitable for this problem. In order to circumvent this difficulty, regularized normal contact modeling is proposed for small and large deflection CCM synthesis problems.
This mechanism is used to transform the non-smooth problem into a sequence of smooth approximations that can be solved efficiently. The above methodology is used to design CCMs for a variety of non-smooth responses with a single monotonic input, using the framework of beam element-based topology optimization.
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