Author:
Xu Fanghui,Dong Dawei,Yan Bing,Song Shizhe,Zhang Rui,Huang Yan
Abstract
Abstract
Focusing on the difficulty in vibration control of internal combustion power plant because of its diverse substructures and complex excitation, an abnormal vibration diagnosis and attenuation method based on the system’s whole-body vibration signals is proposed. The characteristics of the exciting forces, such as toppling torque, inertia force (or moment) and coupling centrifugal force, are analyzed. The resonance frequency distribution of the power unit is obtained by modal analysis. Then an expression that could reveal the relationship between the whole-body vibration intensity and the exciting force amplitude is established, and conclusion is drawn that different excitations would drive the system to vibrate at different frequencies. Based on this basic relation, a fault diagnosis method relying on comprehensive analysis of vibration signals in both time and frequency domain is proposed. Vibration attenuation methods targeted at specific faults are also put forward. Finally, the validity of the proposed method is verified by applying it to a 12V280 diesel generator set.
Subject
General Physics and Astronomy
Reference21 articles.
1. Advanced diagnostic system for piston slap faults in IC engines, based on the non-stationary characteristics of the vibration signals;Chen;Mechanical Systems & Signal Processing,2016
2. Intelligent diagnosis of bearing knock faults in internal combustion engines using vibration simulation;Chen;Mechanism & Machine Theory,2016
3. Engine Fault Classification Based on Characteristic Statistics of Vibration Signals in Angle Domain;Yan;China Mechanical Engineering,2014
4. Physical modeling and experimental verification of magneto-rheological damper under medium and high frequency excitation;Xu;Proceedings of the Institution of Mechanical Engineers Part L: Journal of Materials Design and Applications,2021
5. Design optimization of marine engine-mount system;Tao;Journal of Sound and Vibration,2000