Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Identification of Vibrations in a Spur Gear Transmission System

Tauqir Muhammad1, Shinn- Liang Chang1 and Jen-Yuan Chang2,a

1Department of Power Mechanical Engineering, National Formosa University, Hu-wei, TAIWAN

2 Department of Mechanical and Computer-Aided Engineering, National Formosa University, Hu-wei, TAIWAN


Gears being one of the most significant machine components are frequently employed in the transmission design of automobiles and other rotating machinery. In engineering applications, failure of such critical components results in significant losses, of which failure is commonly caused by mechanical vibrations. As such, vibrations are found to be good indications for monitoring rotating machine's health. This paper discusses identification of vibrations generated by a spur gear transmission system based on acoustic and structural vibration signal processing and analyses. The vibration signals are used in the fault detection for the system in operations. Through numerical finite element parametric studies and experimental modal and acoustic analyses, it was found that tuning structural nature frequencies of the underlying rotating shaft where the spur gear is attached can efficiently reduce the system being excited by external disturbance that leads to structural failure. Two methods were used to overcome the external disturbance. Firstly, two different engineering allowable lengths of transmission shafts are studied to understand the geometric effect on the change of structure's natural frequencies and corresponding mode shapes. In this approach, the model system is investigated through finite element analyses. Secondly, an acoustic structure was created around the model to analyse the gear transmission system without the external disturbance. Using fast-Fourier transformation (FFT), the frequency response functions (FRFs) of the transmission shaft were obtained by using an accelerometer-impact hammer configuration. After employing the aforementioned approaches, the natural frequencies of the spur gear transmission system show a substantial change. The work presented in this paper has engineering implications in smart rotating transmission systems.

Keywords: Gear vibration, Resonance frequency, Vibration analysis, Fast-Fourier Transformation, accelerometer-impact hammer

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