Methodology for multicriterial optimization of a bistable mechanism based on parameter space research

The paper presents a methodology for numerical simulation and multiobjective optimization of «bistable» mechanisms, the key characteristic of which is the ability to maintain two stable states without a continuous supply of energy. The study focuses on a fourbar mechanism design constructed using flexible rods. A numerical procedure is provided for generating the mechanism’s nonlinear force–displacement characteristic, along with an algorithm for selecting rational design parameters based on multiobjective optimization within the design parameter space. Numerical simulations are carried out using the finite element software ANSYS, employing beam elements. The results of mechanism verification are presented, based on an experimental model fabricated via 3D printing using ABS plastic. Special attention is given to the analysis of lateral displacement and its influence on the mechanism’s fixation in the second stable state. To identify rational design parameters, a parameter space exploration method is employed, with trial points generated according to an L?? sequence. An example is provided demonstrating the formation of a feasible solution space, followed by the identification of Paretooptimal design variants according to the criteria of having two stable states and the required range of switching forces.
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