Full
Outline
In response to issues such as damage to bearing seats or motor bearings，as well as damage to blades and air ducts，caused by excessive vibration of exhaust fans，a vibration reduction method combining flow‑induced excitation suppression design and precision machining for centrifugal exhaust fans was proposed on the basis of traditional design and manufacturing.Using numerical simulation and experimental testing methods，the effects of airfoil‑shaped blades and circular‑section volutes on the flow state of flow‑induced excitation sources and structural strength were studied.The results show that there is no significant flow separation in the flow field near the surface of flow‑passing components.The vibration acceleration of circular section casing fans at blade frequency （483.3 Hz） is 8.3 dB lower than that of square section casing fans at blade frequency （773.3 Hz），and 9 dB lower in the overall vibration acceleration level （10~10 000 Hz）.The adoption of high‑precision manufacturing processes （such as integral milling and welding） for the impeller effectively improve the uneven distribution of its mass center.Vibration test results show that the rotational fundamental frequency vibration acceleration at the machine feet reduce by approximately 11 dB，and the high‑frequency vibration is 8.5 dB lower than that of the original design.This study demonstrates that flow‑induced excitation suppression and precision machining methods can effectively reduce the vibration of exhaust fans，providing a reference for the vibration and noise reduction design of fans.
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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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