Simulation Research On Dynamic Radius Error Separation Techniques Of Precision Centrifuge Based On The General Multi-discipline Modeling

Precision centrifuge is the main equipment used for inertial instruments calibration and testing. Its accuracy determines the accuracy of the instrument directly. Dynamic radius is one of the several factors which influence the accuracy of the precision centrifuge. And it is not able to get the accuracy value of the dynamic radius so how to get the real and exact dynamic radius is one of the difficult and key points during the process precision centrifuge development.The research work of the paper based on the accuracy requirement of precision centrifuge-the special program of "The development and application of the equipment of high accuracy inertial meter’s calibration and testing", which is granted by national scientific and technology for ISE CAEP. After literatures studying the paper put forward four factors:the spindle runout and wobble, inertial load, environment temperature variation and the machining errors of the out cylinder of the pan, which have great influence on the dynamic radius. Based on the idea of multi-discipline&multi-factor modeling the general dynamic radius multi-factor model is brought forward to analyze the dynamic radius variation with respect to the four factors varying and for both of the each and the comprehensive of the four factors.The machining error of the precision centrifuge rotor always causes the eccentricity between the mass center and the rotating center, while the inertial force and inertial monument following the eccentricity cause the revolving spindle runout and wobble. The theoretical analysis of the machining error comes to the runout and wobble’s magnitude calculation model, and their linear law versus the angular velocity of the sipindle. Then the multi-body dynamics simulation software LMS Virtual.Lab Motion was used to find out the runout and wobble’s sinusoid curves whose magnitudes equal to the theoretical results, at the meantime the spindle moving style coring and cylinder movement was verified.Inertial load and the environment temperature variation are both structure related. So several possible structure were advanced and for each the deformed configuration from both inertial and the temperature was computed respectively and then the general load bearing well structure survived. Next based on the measurement of the configuration error of the pan the error curve was given out which is the base of the comprehensive simulation.Lastly, the multi-discipline comprehensive model of the dynamic radius was put forward, and then by the orthogonal testing method the main factors i.e. the inertial load (actually the most important factor) and environment temperature variation were got. Then the comparison of the simulation curve versus the measurement curve showed for higher g values the simulation curve could fit the dynamic radius curve in tendency and magnitude except for a small part of the points; however, for lower g values the simulation curve doesn’t fit well.