Precision control and Noise Detection of PM Planetary Gear Drives - Simulation and Analysis of Transmission Performance due to Manufacturing Errors

The project will establish an analysis model for evaluating noise by transmission error within two years, so as to reduce the noise and vibration of the powder metallurgy planetary gear drives during operation. In the research of gear dynamic system, the noise and vibration generated by the transmission are closely related to the transmission error. Therefore, in this project, the signal analysis through noise measurement and the simulated transmission error of the planetary gear mechanism are compared and analyzed, so as to establish a design guideline for improving the transmission performance, which can be an aid to determine the manufacturing tolerance during developing and designing the relevant planetary gear drives.This year's project focuses on the following items.A. Revise the universal analysis model of the planetary gear drives. Three work items are:(1) The errors of important components are confirmed and defined mathematical model parameters.(2) The error parameters are incorporated into the analysis modules to modify the complete analysis model, according to the object structure of the developed universal analysis model. This model can obtain the unloaded or loaded transmission errors in displacement and acceleration under various flank modification and errors, as well as the corresponding frequency spectrum.(3) The spectral characteristics of the transmission error caused by an individual error are established. An existing case is analyzed. The results are compared and verified with the analysis results of measured noise signal.B. Develop a noise measurement system, including the design and manufacturing of a platform, as well as the setup of the measurement system. The transmission noise of an existing planetary gear drive is measured and analyzed by using this system so as to confirm the feasibility.C. Develop the measurement method for accuracy of planetary gear drives. A measuring jig is developed for small gears to measure the run-out errors. The coordinate measuring machine is used to measure the accuracy of the other components, and the precision test bench is used to measure the transmission error of the gearbox. The measured results are the basis for simulation and analysis of the transmission errors.The results of this project can also provide other non-powder metallurgy planetary gear drives for simulation and analysis of transmission errors.