Dynamic Response and Diagnosis of Wear Fault in Plunger Pump Crosshead Guide Plate Based on Multibody Dynamics and Hydraulic Co-simulation

Cong Ren

doi:10.54097/fnr9x550

Authors

Cong Ren PetroChina Lanzhou Petrochemical Company, Lanzhou 730060, China

DOI:

https://doi.org/10.54097/fnr9x550

Keywords:

Plunger pump; crosshead guide plate; wear failure; multibody dynamics; liquid load.

Abstract

In the high-pressure process systems of the petrochemical industry, piston pumps are continuously used under extremely harsh conditions such as ultra-high pressure, large flow rate, long-term continuous heavy load, and media containing corrosive particles. The key friction pairs at the power end are prone to wear failure. This paper takes a new type of five-cylinder piston pump as the research object. Based on the multi-body dynamics theory and the L-N nonlinear spring-damping contact force model, a combined simulation of the hydraulic system and multi-body dynamics is established to study the vibration response of the crosshead guide plate wear fault under hydraulic conditions. The results show that when the liquid pressure exists, the maximum collision force between the crosshead and the guide plate increases with the continuous increase of the gap. When the gap is greater than 0.6mm, the collision force increases significantly; the vibration energy is concentrated near the second-order natural frequency of the housing (about 325 Hz), and the spectral peak increases with the increase of the gap. The study reveals the characteristic parameter variation rules of the crosshead guide plate wear fault, providing a theoretical basis for online monitoring and fault diagnosis of piston pumps in the petrochemical industry.

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