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Outline
To address the excessive noise issue in reciprocating compressors，a series of vibration and noise reduction tests were conducted，including modal analysis，vibration testing，adjustments to the thickness of the outer casing，and replacement of sound‑absorbing materials.Ultimately，the noise level was successfully controlled to 58.7 dB（A）〔meeting the requirement of LP≤60 dB（A）〕.The study indicates that low‑frequency vibrations （10~100 Hz） cause noise radiation from the compressor casing.Modifying boundary conditions can effectively reduce certain low‑frequency vibrations，and vibration transmission pathways determine the characteristics of noise radiation.When acoustic enclosures are not connected to the sound source，they can reduce noise in the mid‑to‑high frequency range （500~2 000 Hz）.Vibro‑acoustic coupling occurs in the form of solid-solid interaction，propagating outward at the first‑order excitation frequency through a single path.Boundary conditions govern both the intensity of vibro‑acoustic coupling and the magnitude of radiated sound waves.Sound‑absorbing materials can only function effectively if they fully enclose the sound‑radiating surfaces.Vibration isolators are effective for noise reduction in the high‑frequency range but fail to reduce low‑frequency noise.This research provides guidance for vibration and noise reduction in similar compressors.
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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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