Structural Design of Three-degree-of-freedom Precision Testing Stages and Workbench Response Surface Optimisation
Orifice measuring instruments are commonly used to measure the diameter of ring gauges or the end of a gauge block.The three-degree-of-freedom precision testing stage is the core of the mechanical part of the orifice measuring instruments.It supports the object stably and can be manually adjusted to meet the requirements of the orifice measuring in-strument.A three-degree-of-freedom precision testing stage is designed to meet the requirements for independent adjustment of three degrees of freedom:y-directional translation,Mz-deflection and My-tilt.A 3D model of the bottom plate is built in SolidWorks and imported into ANSYS Workbench for static analysis to obtain its deformation and stress clouds.In order to reduce the deformation of the platform,a response surface optimisation analysis of the bottom plate is carried out in ANSYS.A central composite experimental design is chosen for the response surface optimisation analysis,with the design variables being the thickness of the bottom plate and the support forces of the three spring-loaded columns.The response is the a-mount of deformation and 25 sets of experimental points are obtained.Based on the experimental results,the response sur-face model of the bottom plate is established using Kriging interpolation method and sensitivity analysis is carried out for each design variable.The optimised design of the base plate is completed using a multi-objective genetic algorithm,which reduces the deformation of the platform by 20.1％compared to the original structural solution.
万方数据
维普
