Monitoring method for influence of friction force of cylinder liner on reciprocating equipment on torsional vibration of shaft system

Abstract

The invention provides a method for monitoring the influence of reciprocating equipment cylinder sleeve friction force on shafting torsional vibration. The method comprises the steps of 1, calculatinginherent frequency of shafting torsional vibration; 2, testing the inherent frequency of shafting torsional vibration under different lubrication states through an LMS acquisition instrument; 3, comparing the inherent frequency calculated in the step 1 with the inherent frequency tested in the step 2, and if the inherent frequency is not changed, calculating friction force as exciting force of shafting vibration; if the friction force changes, the friction force is converted into a damping item of the system for calculation; and 4, comparing the calculation result in the step 3 with a shafting torsional vibration result under the condition of not considering the action of the friction force, and analyzing the influence of the friction force on the shafting torsional vibration amplitude and frequency. According to the method, the excitation effect of friction force on shafting torsional vibration and the influence on shafting inherent characteristics are comprehensively considered, a comprehensive and scientific research method is provided, and a certain support is provided for further exploration and utilization of torsional vibration signals to achieve online monitoring of reciprocating equipment cylinder scoring faults.

Description

technical field [0001] The invention relates to a research method for the torsional vibration mechanism of reciprocating equipment, in particular to a research method for the influence of friction force of reciprocating equipment on the torsional vibration of shafting under different lubrication conditions. Background technique [0002] The piston ring-cylinder liner is one of the most important friction pairs of the internal combustion engine. A considerable part of the operation failure of the internal combustion engine is related to the failure of the piston ring. The main function of the piston ring-cylinder liner system is to ensure that the piston ring can contact the inner wall of the cylinder liner when it moves An effective seal can be formed between them, which not only prevents the combustion chamber gas from escaping into the crankcase to cause gas leakage, but also prevents the lubricating oil in the crankcase from entering the combustion chamber to burn. For no...

AI Technical Summary

Problems solved by technology

[0005] At present, there is very limited public literature on methods for verifying the degree of influence of friction on torsional vibration

In 2007, Guzzomi et al. from the University of Western Australia in Australia used the variable inertia model to study the change of the free vibration frequency of torsional vibration when considering the influence of friction force on reciprocating machinery, but they have not studied the forced vibration

In 2014, Li Wanyou of Harbin Engineering University and others introduced the friction force of piston rings into the forced response calculation of torsional vibration for the first time, and found that the second harmonic amplitude of the torsion angle is more sensitive to the cylinder failure of marine four-stroke diesel engines, but the The literature does not consider the influence of friction on the inherent characteristics of the system, but only calculates friction as part of the excitation force

Images