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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (3): 987-994.doi: 10.7527/S1000-6893.2014.0127

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Dynamics modeling and frequency characteristic of anti-backlash gear servo system

LIAO Hongbo, FAN Dapeng, FAN Shixun   

  1. College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China
  • Received:2014-05-12 Revised:2014-06-23 Online:2015-03-15 Published:2015-03-31
  • Supported by:

    National Natural Science Foundation of China (51135009)

Abstract:

Anti-backlash gear is widely used in the aerospace precision servo mechanism, which has the requirements of high precision, high response speed and high stability, so it is important to research its frequency characteristic. Based on the method of modeling of two-mass system, the dynamics model which includes the linear and nonlinear parts of anti-backlash gear servo system is built. The segment dead zone model of anti-backlash gear is established based on the segment dead zone model of spur gear. The formula which can calculate the equivalent stiffness of anti-backlash gear is deduced, especially including the formula of stiffness of anti-backlash spring. The influences of shaft stiffness, static backlash and anti-backlash spring stiffness on response frequency are analyzed by the method of numerical simulation. The results show that static backlash and anti-backlash spring stiffness are important factors.

Key words: anti-backlash gear, equivalent stiffness, resonance frequency, backlash, anti-backlash spring

CLC Number: