Noise source localization of a heavy commercial vehicle cab under a road test

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (20) : 307-314.

YANG Hongbo1, GUO Lei2, SHI Wenku1, CHEN Zhiyong1, ZHAO Yanyan2, LIU Jian2, YUAN Renfei2

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Abstract

Aiming at the problem of whining noise in the cab of a heavy commercial vehicle in the acceleration condition with middle and low gear, the research is conducted. Firstly, the powertrain including engine, gearbox and the middle and rear dive axle is studied. The power transmission route of the gearbox in problem gear is analyzed, and the meshing gear pair involved in power transmission is defined. Secondly, the road loading test of the whole vehicle is designed. The corresponding speed, noise, and vibration acceleration sensors are arranged in the engine flywheel, cab, gearbox near field and shell, middle and rear drive axle shells, and the frame. The engine speed is tracked, and the noise and vibration signals of each measuring point are collected under 7-gear acceleration condition. The experimental data are processed and analyzed. The results show that, in addition to engine excitation, the cab noise is mainly caused by the excitation of 28 order and 42 order, and the latter is more significant. The order of the main gearbox, auxiliary gearbox, and the gear pair of middle and rear drive axle is calculated. The results show that the meshing order between the single planetary gear and the outer gear ring in the planetary gear mechanism of the auxiliary gearbox is 14.02, and the second and third harmonic orders are corresponding to the whining noise order in the cab. The root of the problem is located. Finally, the corresponding improvement measures are put forward.
Key words: commercial vehicle; powertrain; cab; whine; road test

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commercial vehicle / powertrain / cab / whine / road test

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YANG Hongbo1, GUO Lei2, SHI Wenku1, CHEN Zhiyong1, ZHAO Yanyan2, LIU Jian2, YUAN Renfei2. Noise source localization of a heavy commercial vehicle cab under a road test[J]. Journal of Vibration and Shock, 2022, 41(20): 307-314

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