A Structural Analysis Approach for Engine Noise Source Identification and Refinement

Inavolu, Nagasuresh; Medisetti, Jaganmohan Rao; Kumar, Sandip; Lingeshkumar, J; Loya, Akshay; Mv, Mvgprasad

doi:10.4271/2017-01-1799

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Most of the sources of the diesel engine noise and vibration have been the subject of extensive investigation. 1–7 The combustion process leads to cylinder pressure development which controls the loading of the engine structure and to a large extent, the generation of engine noise and vibration. Engine noise and vibration are also made by various forces (inertia forces) which act on the moving mechanisms of the engine, resulting in mechanical impacts.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the combustion-induced noise and vibration using coherence and wavelet coherence estimates in a diesel engine

Ahmadian

Najafi

Ghobadian

et al. 2019

International Journal of Engine Research

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The understanding of noise generation and source identification is vital in noise control. This research was conducted to experimentally evaluate combustion-induced noise and vibration using coherence and wavelet coherence estimates. A single-cylinder direct-injection diesel engine was chosen for experimental investigation. The independent variables for conducting experiments were injection timing with five levels of 22, 27, 32 (normal), 37, and 42 crank angles before the top dead center, and also the engine torque load with four levels of 55%, 70%, 85%, and 100% of the rated value. The signals of cylinder pressure, liner acceleration, and radiated sound pressure of the test engine were measured and recorded. Then, coherency and wavelet coherency experiments were carried out between cylinder pressure and liner acceleration, cylinder pressure and sound pressure, and liner acceleration and sound pressure signals in MATLAB software. The results indicated that increasing load would increase wavelet coherency between cylinder pressure and liner acceleration signals at frequencies higher than 1 kHz. The coherent regions between cylinder pressure and sound pressure signals were mainly at frequencies higher than 1 kHz while advancing the fuel injection timing had shifted the coherency toward lower frequencies. In general, with advancing injection timing, the coherent regions between liner acceleration and sound pressure signals have appeared at broader time ranges, especially at frequencies between 100 and 500 Hz. Comparing the results of the wavelet coherency and coherency tests, we concluded that wavelet coherency is a more accurate and descriptive tool in evaluating the combustion-induced noise and vibration.

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