Reliability Analysis And Optimal Design Of Double Sinusoidal Corrugated Hinge

With the development of precision engineering,compliant mechanisms are now widely used in precision instruments.As a key part of the entire flexible support system,they play a vital role.However,under the continuous action of internal and external factors,the structure Insufficient quality characteristics can lead to a series of safety problems.In the case of many different functional requirements,how to solve the key structure and make targeted improvements to improve the overall quality characteristics of the organization.This article takes the magnifying mechanism of the micropositioning platform as an example,and improves the comprehensive quality characteristics of the magnifying mechanism by optimizing the performance of flexible components.Its main research work is as follows:(1)Aiming at the problem of how to carry out effective and rapid modeling according to a large amount of actual demand information,a modeling method that combines axiomatic design and finite element analysis is proposed.First,according to the axiom design principle,the amplification mechanism is functionally decomposed,and its technical parameters are continuously iteratively matched and merged to reduce the total amount of program information and generate a conceptual model of the compliant mechanism;then,the sub-functions of the main influencing components are retrieved by examples,A series of hinge structures were drawn out;finally,combined with Ansys software analysis,the double-sine corrugated hinge structure was screened out according to comprehensive performance indicators and brought into the magnifying mechanism to obtain the initial performance data of the mechanism.It verifies the feasibility of axiomatic design combined with finite element analysis for effective modeling when faced with a large amount of functional information.(2)Aiming at the problem of how to predict the maximum stress value of the structure while effectively evaluating the reliability of the structure,the analysis of introducing the detailed fatigue rating method(DFR method)into the compliant mechanism is proposed.By comparing the reliability index analysis results with the traditional first-order second-moment method and the response surface method,and comparing the DFR value with the maximum stress value of the simulation result,it is verified that the DFR method is applied to the reliability analysis and the maximum stress of the compliant hinge Applicability for value prediction.(3)Aiming at the problem of how to effectively improve the comprehensive quality characteristics of the structure according to the different degree of influence of various factors on the structure,an optimization method of weighted parameters is proposed.First,combine Taguchi test and sensitivity analysis to establish the different rate of change of each parameter to quality characteristics;then,through linear fitting,the corresponding weight coefficients of the displacement change and the natural frequency change are obtained,and the factor level is determined by the comprehensive influence weight.Selection of range indicators;finally,to establish a mathematical optimization model for parameter optimization.After experimentation,this method quantitatively designs the value range of each factor,effectively improves the comprehensive quality characteristics of the structure,and provides a reference for the optimal design of the compliant mechanism.