Analysis of Engine Camshaft Bearing Loosening Fault Based-on Model Simulation and Vibration Signal

Du, Can Yi; Yu, Fei

doi:10.4028/www.scientific.net/amr.694-697.896

Cited by 1 publication

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“…A diesel engine camshaft underwent instantaneous circumferential cracking that propagated brittlely due to tensile stress generated at the site of camshaft straightening [3]. Du and Yu [4] developed an engine power assembly and accompanying valve train. ey compared the vibration acceleration signals of the engine cylinder head in normal and fault states to determine the loosening fault features of camshaft bearings.…”

Section: Introductionmentioning

confidence: 99%

Camshaft Loosening Diagnosis on the Basis of Generalised Force Recognition at the Centre of Gravity of an Engine

Meng

Gong

et al. 2021

Mathematical Problems in Engineering

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A valve mechanism supports the working process of an engine cylinder, and a camshaft is a key component required to open and close a valve. When a camshaft loosens, the balance of the engine disrupts. In the meanwhile, the generalised force at its centre of gravity (CG) alters. This study proposed a novel technique to detect camshaft loosening based on recognising the generalised force at the CG of the engine. We conducted Hanning windowed interpolation of discrete spectra to extract the precise phase and amplitude by utilising the acceleration signals at the engine cylinder and mounts and cylinder head. We then accurately computed the generalised force at the CG. Finally, we accurately extracted the camshaft loosening features by analysing the main harmonic orders for the generalised force. As indicated by simulations, our method can be used to effectively detect combustion engine faults involving camshaft loosening.

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Section: Introductionmentioning

confidence: 99%