Journal of Failure Analysis and Prevention

, Volume 17, Issue 4, pp 812–822 | Cite as

A Study on Dynamic Response and Diagnosis Method of the Wear on Connecting Rod Bush

  • Zhinong Jiang
  • Zhiwei Mao
  • Yidan Zhang
  • Jinjie Zhang
Technical Article---Peer-Reviewed


Wear is a typical failure form for mechanical parts of a reciprocating compressor. The clearance of a connecting rod bearing will exceed the normal value due to the wear caused by poor lubrication or abnormal loads. Wear on the small-end bush of a connecting rod (SEBCR) in a reciprocating compressor is still a hard work to be monitored and diagnosed. In this paper, we focus on the study of the dynamic response and diagnosis method on wear fault of SEBCR based on the dynamic simulation and vibration signal analysis. A rigid-flexible coupling model of a connecting rod has been built, and the connecting rod is treated as a flexible body. The clearance between the crosshead pin and the small-end bush of a connecting rod is taken into account. The simulation results show that abnormal clearance will affect the dynamic characteristic significantly, and high acceleration impacts will occur at the reversal points of the crosshead pin. Based on the dynamic response and signal feature extraction, a new diagnosis method calculating the amplitude and change rate of average vibration energy per crank angle to detect the wear fault is proposed. The experiment results on a reciprocating compressor show that the vibration of the compressor crosshead is consistent with numerical simulation results, and the method is capable of detecting the wear fault in real time. Research presented in this paper is significant in providing tools for diagnosing wear fault of reciprocating compressors.


Reciprocating compressor Connecting rod Dynamic characteristic Feature extraction Wear fault 

List of symbols


Radial clearance


Radius of bearing


Radius of neck journal


Deviation degree of center




Normal contact force


Contact stiffness


Damping coefficient


Depth of relative penetration

\( \dot{\delta } \)

Relative impact velocity


Cylinder volume


Displacement of piston


The absolute temperature of the gas in cylinder


The polytropic index of the air gas

\( \dot{m}_{vi} \)

Mass flow rates in the suction process


The variable coefficient


Density of the air in cylinder


The number of samples in one crank angle


Change rate of average vibration energy per crank angle

σb, σj

Material properties


Poisson’s coefficient


Young’s modulus


Friction force


Maximum friction forces


Friction coefficient


Static friction coefficient


Dynamic friction coefficient

vs, vd

Threshold velocities


Gas pressure


Piston cross-sectional area




Absolute pressure of the gas in cylinder

\( \dot{m}_{vd} \)

Mass flow rates in the discharge process


The flow direction parameter


The maximum flow area


The amplitude


Average vibration energy per crank angle


The angle ranges of the TDC and BDC, respectively



This work was supported by the National High Technology Research and Development Program of China (863 Program) under Grant No. 2014AA041806 and the Fundamental Research Funds for the Central Universities (ZY1617).


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Copyright information

© ASM International 2017

Authors and Affiliations

  • Zhinong Jiang
    • 1
  • Zhiwei Mao
    • 1
  • Yidan Zhang
    • 1
  • Jinjie Zhang
    • 1
  1. 1.Diagnosis and Self-Recovering Engineering Research CenterBeijing University of Chemical TechnologyBeijingChina

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