7/6/2023 0 Comments Piezo bridges![]() ![]() However, the kinematics of these flexure-based mechanisms is based on the deflections of their flexure hinges, and this has led to techniques for design, analysis and modeling for compliant mechanisms. The compliant mechanisms employ flexure hinges instead of rigid joints to eliminate mechanical play and friction, and hence can achieve ultra-precise and smooth motions. Consequently, compliant mechanisms are generally employed to scale the displacement in values compatible with PZTs, including bridge, Scott-Russell, and lever type mechanisms. However, one of their main drawbacks is the relatively small motion stroke, at about 0.1 percent of its length. The advantages of piezoelectric actuators include precise motion capability, compact size and large blocking force. In recent decades, piezoelectric actuators (PZTs) have been frequently used in micro/nano-applications including advanced manufacturing, high precision positioning, scanning probe microscopes and biological cell manipulation. The formulations of the new analytical method are simplified and efficient, which help to achieve sufficient estimation and optimization of compliant bridge mechanisms for nano-positioning systems. Finally, comparison with previous studies further validates the versatility and accuracy of the proposed models. The presented equations were verified using both computational finite element analysis and through experimentation. Using the established equations, a piezo-driven compliant bridge mechanism has been optimized to maximize displacement amplification. General equations of input displacement, output displacement, displacement amplification, input stiffness, output stiffness and stress are presented. Based on elastic beam theory, a kinematic analysis of compliant bridge mechanisms in general configurations is presented. Analytical equations have previously been specifically developed for two configurations of bridge mechanisms: parallel and rhombic type. Compliant bridge mechanisms are frequently utilized to scale micrometer order motions of piezoelectric actuators to levels suitable for desired applications. ![]()
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