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| Simulation Study on Vibration and Noise of Gearbox under Internal Excitation |
| Received:January 29, 2024 Revised:April 03, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.07.019 |
| KeyWord:internal excitation vibration noise gearbox infinite element method non-reflective boundary method module |
| Author | Institution |
| ZHONG Mu |
School of Traffic &Central South University, Changsha , China ;Transportation Engineering, Central South University,Central South University, Changsha , China |
| WANG Yanjing |
School of Traffic &Central South University, Changsha , China |
| YAO Shujian |
School of Traffic &Central South University, Changsha , China ;Transportation Engineering, Central South University,Central South University, Changsha , China;Frontiers Science Center for Extreme Mechanics and Engineering, c.Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha , China |
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| Abstract: |
| The work aims to study the transmission stability of gearbox under internal excitation and the generation, propagation and radiation of vibration noise. Considering the effect of time-varying stiffness, error excitation and other factors on the gear system, the pure torsional dynamics model of gear transmission was established by the lumped parameter method. Based on MATLAB numerical calculation, the time domain and frequency domain characteristics of vibration and noise under internal excitation were analyzed from the perspective of dynamic meshing force. The finite element model of gearbox was established, and the modal analysis and frequency response analysis were carried out. With the results of dynamic analysis as the boundary conditions, the infinite element method and the non-reflective boundary method were used to simulate the vibration and noise of gearbox respectively. The natural frequency, mode and frequency response curves within 2 000 Hz were obtained. Combined with the peak frequency of vibration, the vibration of the gearbox was predicted. The radiation sound power level curve, field point sound pressure level curve, sound directivity and sound pressure level cloud map of the gearbox in the unbounded sound field were obtained. The calculation results of the infinite element method and the non-reflective boundary method were compared to obtain the optimal application conditions. The dynamic excitation inside the gearbox has obvious periodicity and impact, and the gear transmission process contains more meshing frequency and double frequency components. The upper and lower surfaces of the gearbox are thin-walled structures, and the vibration is obvious, which is the main part of the vibration of each order mode. The box has a single mode in the low-order mode, and several mode coupling phenomena appear in the high-order mode. The infinite element method takes a long time for calculation, but has high precision in near-field analysis, and is suitable for near-field acoustic analysis. Compared with the infinite element method, the non-reflective boundary method consumes less calculation time, and the far-field analysis is more accurate, which is suitable for the analysis of high-frequency and far-field acoustic problems. |
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