| With the basic industry and manufacturing rapid development,precision measurement and position for the large scale workpiece is the basis equipment manufacturing,and the indispensable processes technology assurance means for improving precision and efficiency and ensuring quality.To solve the problem of precision measurement and positioning for the large scale workpiece during assembly,a company developes a high-precision measurement equipment(iGPS),iGPS basing on GPS(Global Positioning System)location idea is developed which is applied to the large-size indoor which is the noncontact precision measurement of three-dimensional measurin device.The device has a high accuracy,high reliability and high efficiency(supporting multi-user simultaneous measurement),etc.,which provides a high efficient solution for precision measurement of.large size flexible interior space.Because there is great vibration phenomena for iGPS system at work,which seriously affects the measurement accuracy of iGPS device.To solve this problem,we do some related research work.This paper establishes 3D solid model of the iGPS,The finite element analysis of overall structure of iGPS gets the first three frequency and vibration mode and other datas,we find the resonates phenomena in the working speed range,it affects the measurement accuracy of iGPS device and finds the resonance of the weak links,while we take advantage of the vibration test to verify the results of the finite element analysis and accuracy,which provides a theoretical reference for improving structure for future.Due to the air flow field is formed between the rotor and stator of iGPS,we get its velocity vector and pressure distribution characteristics of air flow field by numerical analysis,Basing on the distribution of the velocity vector and pressure distribution,IGPS device when a certain speed,the same pressure at the same value as the radius,this will not cause the swinging phenomenon.Therefore,the air flow field is not one of the main measurement accuracy factor.According to the results of the modal analysis and numerical analysis of iGPS devices,the resonates reduces the measurement accuracy of iGPS,the structure of the iGPS is improved and it’s long sleeve component size is optimized,not only the natural frequency of the iGPS devices is improved and avoids the resonates at work,the overall quality of iGPS devices is reduced,which reduces material wasting and cost savings. |
