Analysis of bending-torsion coupling vibration characteristics of compressor shaft system considering hardening stiffness characteristics
ZHANG Hao
ZHAO Xiang
ZHANG Dongmei
ZUO Song
Abstract：[Objective]This study aims to investigate the influence of coupling variable stiffness characteristics on the vibration behavior of the shaft system.The motor rotor-coupling-crankshaft-bearing system of a compressor was selected as the research object.[Methods]A coupled bending-torsion dynamic model of the shaft system was constructed using the Lagrange method.The effects of variable stiffness,rotational speed,and bearing clearance on the vibration response and nonlinear behaviors were analyzed through numerical simulations.[Results]The results indicate that variable stiffness characteristics lead to"sawtooth"fluctuations in phase space,while the shaft center trajectory remains largely unaffected.As rotational speed increases,hardening stiffness induces nonlinear behaviors such as chaos and bifurcation,causing a rightward shift of resonance peaks,phase space fluctuations decrease with reduced bearing clearance.These findings provide a basis for predicting vibration behavior and guiding speed selection for shaft systems.
Keywords：Compressor shaft systemBending-torsional couplingHardening stiffnessNonlinear dynamicsBifurcation
Publication Date：2026-06-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：11( 99-109 )