Shafting vibration characteristic analysis method and system based on elastohydrodynamic lubrication

By establishing a friction analysis model based on the line contact elastohydrodynamic lubrication theory and coupling analysis of shaft torsional vibration characteristics, the problem of vibration characteristic analysis of valve train-oil supply cam pair under elastohydrodynamic lubrication state was solved, realizing accurate vibration characteristic analysis of camshaft system and improving system stability.

CN121189221APending Publication Date: 2025-12-23HARBIN ENG UNIV
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Patent Information

Application Number
CN202511286838.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2025-12-23

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively analyze the vibration characteristics of the valve train-fuel camshaft pair under elastohydrodynamic lubrication conditions, leading to increased friction and wear and unstable system vibration.

Method used

Based on the theory of line contact elastohydrodynamic lubrication, a friction analysis model is established. Combining the Reynolds equation, the contact lubrication film thickness equation, the Bair-Winer rheological model, and the flash temperature model, the change of total interface friction force is calculated. The Newmark-β integral algorithm is used to solve the differential equations of shaft torsional vibration, and the influence of time-varying friction on the instantaneous vibration characteristics of the camshaft system is obtained.

Benefits of technology

This enables precise analysis of the vibration characteristics of the camshaft system, reduces friction and vibration, and improves the stability and efficiency of the system.

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Abstract

The invention discloses a shafting vibration characteristic analysis method and system based on elastohydrodynamic lubrication, and relates to the technical field of mechanical engineering.The method comprises the steps that the entrainment speed, the time-varying curvature radius and the contact load at a contact point in a gas distribution-oil supply cam pair are determined; respectively inputting the entrainment speed, the time-varying curvature radius and the contact load at the contact point into a friction analysis model in an elastohydrodynamic lubrication state, and calculating a time-varying curve of the total interfacial friction force of the gas distribution-oil supply cam pair in the whole working cycle; based on time-varying friction excitation corresponding to any moment in the change curve, determining a system excitation vector of the gas distribution-oil supply cam pair by using interface friction as a key connection quantity through experimental testing and simulation modeling technologies; according to the system excitation vector and the structure parameters of the camshaft system, establishing a camshaft system torsional vibration characteristic coupling analysis model considering the interface elastohydrodynamic state; and solving the shaft system torsional vibration differential equation set to obtain the influence rule of the time-varying friction on the instantaneous vibration characteristics of the camshaft system.
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