Computation Method of Gear Dynamic Response Using Experimental Strain Data and Application in Pitting Fault Analysis

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Published Sep 22, 2019
Yongzhi Qu Haoliang Zhang Zechao Wang Zude Zhou

Abstract

In this paper, A semi-physical method for calculating time varying mesh stiffness and the dynamic response of gear system based on experimental strain data is studied. In a previous work, it was reported that dynamic strain on gear tooth root can be measured under normal operating condition using fiber Bragg Grating (FBG) sensors. This paper aims to compute gear dynamic response using experimental strain data and give an explanation of the fault propagation process. Using the dynamic strain data from FBG sensors, a method for calculating the dynamic response of gear system is proposed. Based on the theory of potential energy and material mechanics, the relationship between the bending strain of the tooth root and the time varying mesh stiffness is established. The time varying mesh stiffness and dynamic response of healthy gear and pitted gear are then calculated respectively. The force transmission during gear mesh under the condition of surface pitting is analyzed. It is concluded that in the case of pitting fault, there will be a significant loss of torque in the power transmission process due to the loss of contact area. It is further inferred that the loss of meshing force andthedecreasing of Hertzian contact stiffness are the major contributing factors for pitting fault. In addition, the semi-analytical method of computing gear dynamic response is validated with experimental study ofacceleration signal in the perspective of dynamic response.

 

How to Cite

Qu, Y., Zhang, H., Wang, Z., & Zhou, Z. (2019). Computation Method of Gear Dynamic Response Using Experimental Strain Data and Application in Pitting Fault Analysis. Annual Conference of the PHM Society, 11(1). https://doi.org/10.36001/phmconf.2019.v11i1.810
Abstract 173 | PDF Downloads 156

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Keywords

Gear, Pitting, Time varying mesh stiffness, Dynamic strain, Dynamic response, FBG

Section
Technical Papers