Engine Excitation Force Identification on the Basis of Discrete Spectrum Correction

Xu, Chuanyan; Cao, Fengping

doi:10.1155/2015/175257

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…This method was found to be effective to reconstruct the exact values of forces and moments values. A similar approach was proposed by [19] using the interpolation method to establish engine excitation forces.…”

Section: Highlights Abstractmentioning

confidence: 99%

Hybrid methodology using balancing optimization and vibration analysis to suppress vibrations in a double crank-rocker engine

Albaghdadi¹,

Baharom²,

Sulaimana³

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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This study aims to present mathematical modelling to evaluate and analyze double crankrocker engine performance. The study suggests the use of two methods to reduce system vibration through balancing optimization and vibrational analysis. The combination of both methods acts as a verification method; besides it can be used as a tool for further system design enhancement and condition monitoring. The derived mathematical model is then used for balancing optimization to identify system shaking forces and moments, while variable speed is considered as an added parameter to evolve the optimization process. This factor shows better enhancement in reducing system shaking forces and moments compared to constant speed balancing method. Next, the system characteristics were concluded in terms of mode shapes and natural frequencies using modal and frequency response analysis, which give clear clue for secure system operational ground. Finally, the reduction in system vibrations was translated into engine’s centre of mass velocity, which evaluates balancing process effectiveness and indicate if further enhancement should be conducted.

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Section: Highlights Abstractmentioning

confidence: 99%

Hybrid methodology using balancing optimization and vibration analysis to suppress vibrations in a double crank-rocker engine

Albaghdadi¹,

Baharom²,

Sulaimana³

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…We can precisely extract the acceleration signal phases and amplitudes by exploiting the engine acceleration signals at the mounts and block by using discrete spectrum interpolation. e generalised force at the CG [17] is given by…”

Section: Theoretical Fundamentsmentioning

confidence: 99%

“…us, attaining accurate relative phases between acceleration responses leads to a decrease in the error estimates of the generalised force. However, in the 2nd harmonic, phase errors vary, provided the failure of maximum spectral lines is within different frequencies, and alterations are present in the relative phases [17]. e interpolation method is used to estimate frequency bias based on the amplitude ratio of the first two maximum spectral lines.…”

Section: Interpolationmentioning

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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“…According to the acceleration signals at the engine mounts, through the interpolation method of the discrete spectrum, the accurate amplitudes and phases of the acceleration signals can be extracted. According to equations ( 2) and ( 4), the generalized force at the centre of gravity can be calculated by the following equation [25].…”

Section: Mq(t)+cq(t)+kq(t)= F(t)mentioning

confidence: 99%

Misfire Detection Based on Generalized Force Identification at the Engine Centre of Gravity

Cao

et al. 2019

IEEE Access

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Misfiring creates a unique pattern attributed to a particular cylinder. When a misfire occurs, the balance of the engine is destroyed, and the generalized force at the centre of gravity (C.G.) of the engine is changed. In this paper, a new misfire detection method is presented based on the identification of the generalized force at the engine centre of gravity. Based on the engine acceleration signals at the mounts, through the use of the discrete spectrum interpolation method, the accurate amplitudes and phases of the acceleration signals are extracted, and then, the generalized force at the centre of gravity is calculated. Through analysing the main harmonic orders of the generalized force, the misfire features are accurately extracted and classified. Both the simulation examples and test bed results prove the effectiveness of the present method in detecting misfire faults in combustion engines.INDEX TERMS Engine, misfire detection, the centre of gravity, the generalized force.

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Engine Excitation Force Identification on the Basis of Discrete Spectrum Correction

Cited by 4 publications

References 11 publications

Hybrid methodology using balancing optimization and vibration analysis to suppress vibrations in a double crank-rocker engine

Hybrid methodology using balancing optimization and vibration analysis to suppress vibrations in a double crank-rocker engine

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

Misfire Detection Based on Generalized Force Identification at the Engine Centre of Gravity

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