Abstract
Thermal influences the stiffness, and then affects dynamic characteristics of the platform. The paper appoints a method to calculate the global stiffness of the positioning platform with large trip and high precision, and find the rule that the platform stiffness changing with the temperature to follow. The rule provides a fundamental basis for establishing vibration model of the platform. The main method to collect analysis data is finite element. Firstly, choose a number of points from the surfaces of the platform. Through the experiment data of thermal stress coupling analysis on the platform and a degree of grey incidence, the degree of correlation between all concerned points and thermal displacement can be solved. The key points are confirmed the one which have large degree of grey incidence which also have large influence on the stiffness, and will be the input value of stiffness model of the platform. Calculate the global stiffness value of positioning platform under different temperature using the finite element method analysis. Establish the stiffness model using BP neural network.
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