Friction Torque Model and Experiment Verification on the Free Rotor of Hydraulic Transformer

doi:10.3901/JME.2025.06.308

Abstract

Abstract: Friction torque model is an essential prerequisite for the rotor dynamic analysis and performance evaluation of hydraulic transformer. However, an accurate friction torque model within the full speed range is currently lacking. Based on the Stribeck friction model, the friction states of each friction pair are analyzed. The friction coefficient for boundary lubrication, mixed lubrication, and fluid lubrication are solved successively. According to the continuous condition of the friction coefficient, the calculation method of the transition points between lubrication states is given, and the general friction coefficient model for each friction pair is established. Based on the general friction coefficient model, the friction parameters of the slipper pair and the flow distribution pair are determined, the friction coefficients are solved, and the calculation method of the friction torque is given. The stirring torque of the free rotor is calculated, and the friction torque model of the free rotor in the full speed range is established. A platform on friction torque of the free rotor is built, and the test is carried out to verify the correctness of the theoretical model. The friction torque model provides a good basis for the dynamic analysis and accurate control of the hydraulic transformer.

Key words: hydraulic transformer, free rotor, Stribeck friction model, friction coefficient, friction torque

CLC Number:

TH137

BAO Qianqian, ZHOU Junjie, JING Chongbo, LIAO Wenbo, DU Shanxiao, ZHANG Zhu. Friction Torque Model and Experiment Verification on the Free Rotor of Hydraulic Transformer[J]. Journal of Mechanical Engineering, 2025, 61(6): 308-315.

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