Modeling and analysis of the transient vibration of camshaft in multi-cylinder diesel engine

Guo, Jie; Zhang, Wenping; Zhang, Xinyu

doi:10.1177/1687814015616087

Cited by 6 publications

(3 citation statements)

References 13 publications

(17 reference statements)

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“…The camshaft model considering both camshaft angular vibration and bending vibration was presented in Guo et al (2015). Each follower element was treated as a multi-mass system.…”

Section: Modelling Of the Cam-tappet Contactmentioning

confidence: 99%

Analysis of dynamics and friction resistance in the cam-tappet system

Siczek

Stefański

2019

Journal of Theoretical and Applied Mechanics

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In this paper, the influence of friction resistance and mutual contact interaction on dynamical properties of the cam-tappet mechanism is analyzed. A dynamical model of the cam-tappet contact has been developed. Chosen results of numerical simulations of this model are presented for cases with and without oil lubrication in contact zones. Various phenomena accompanying the cam-tappet contact dynamics have been observed, e.g., change of the global direction of tappet rotation, local oscillation of these revolutions, changes of friction in function of frequency of the camshaft longitudinal vibrations. We confirm, that the growing amplitude of camshaft longitudinal vibration causes an increase in the tappet rotational speed, whereas its reducing to small values leads to stopping the tappet rotation.

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“…The camshaft model considering both camshaft angular vibration and bending vibration was presented in Guo et al (2015). Each follower element was treated as a multi-mass system.…”

Section: Modelling Of the Cam-tappet Contactmentioning

confidence: 99%

Analysis of dynamics and friction resistance in the cam-tappet system

Siczek

Stefański

2019

Journal of Theoretical and Applied Mechanics

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“…e diagnosis of camshaft faults must be effectual and accurate to ensure that the engine operates as usual [10]. Vibration signals, containing a large amount of fault information, are extensively utilised to diagnose faults [11][12][13][14].…”

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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“…M. Eissa et al [20][21][22] used a longitudinal vibration absorber to effectively reduce the pitch and roll vibrations of a ship. Jon Juel Thomsen studied the characteristics of nonlinear vibration systems exposed to multifrequency excitation sources with high frequency bands [23] and the vibration of multicylinder diesel engines was also investigated [24]. These efforts do not consider the existence of multiple excitation source.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of floating raft system under multiexcitation condition

Li¹,

Zhang²

2020

J. vibroeng.

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A floating raft system is subjected to multiple excitation sources with multiple frequencies for each excitation source. Considering the two characteristics of excitation source, the stability of floating raft system was analyzed. A vibration equation for the floating raft system under multiexcitation condition was established. A multiscale method was then used to solve the equation. The amplitude-frequency response equation and unstable region of solution are discussed. The results show that the vibration of raft frame fits the pattern of soft-spring vibration. This indicates that the excitation of main raft unit with a rigid connection compromises the stability of the system, whereas the excitation of unit with elastic connection increases stability.

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Modeling and analysis of the transient vibration of camshaft in multi-cylinder diesel engine

Cited by 6 publications

References 13 publications

Analysis of dynamics and friction resistance in the cam-tappet system

Analysis of dynamics and friction resistance in the cam-tappet system

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

Stability analysis of floating raft system under multiexcitation condition

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