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Transmission noise directly influences the comfort of the entire vehicle. This paper reviews the existing transmission noise control techniques, and introduces the mechanism and transmission path of high-frequency whine noise, mid-frequency clashing noise and low-frequency vibration noise according to the noise frequency characteristics. Research shows that optimizing the transmission housing structure and applying sound-absorbing materials can reduce the radiation of whine noise. Micro-texturing of gears is efficient and cost-effective for improving gear whine noise, and is expected to be a future research hotspot. Adjusting torsional characteristic parameters and reasonably increasing the drag torque of idler gears can effectively suppress clashing noise. The influence of temperature on gear deformation needs to be considered in future studies. The dual-mass flywheel performs well in controlling engine speed fluctuations, and future research can focus on improving the design of the dual-mass flywheel and optimizing the engine calibration program. Changing the natural frequency of the housing and optimizing gear parameters are effective approaches to reduce vibration noise, however, there are fewer methods controlling oil pump and strap vibration noise, and the influence of lubricating oil on vibration noise should also be considered. The application of future high-efficiency and high-precision transmission noise control technologies will rely on the support of intelligent optimization algorithms.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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