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山西省运城拖拉机厂生产的五台山—120和五台山—150型小四轮拖拉机,深受农民欢迎。但是,该机噪声较大,已成为城镇的主要噪声污染源之一。为了对该拖拉机的排气噪声和机架振动采取控制措施,我校内燃机噪声控制研究组与运城拖拉机厂拖拉机研究所合作,从一九八三年八月开展了小四轮拖拉机噪声控制的研究工作。经过一年多的探索、计算及多次试验,终于在噪声控制方面取得了显著的成效。参加该项科技成果鉴定会的省内外大专院校、研究所、专业厂等十九个单位的三十一名代表认为:该项成果可使12马力(120型)和15马力(150型)小四轮拖拉机的环境(动态)噪声降低到82dB(A)以下,驾驶员耳旁噪声降低到94dB(A)以下。这一噪声
Shanxi Province Yuncheng tractor factory production Wutai Mountain -120 and Wutai Mountain -150 small four-wheel tractors, welcomed by farmers. However, the aircraft noise larger, has become one of the major sources of noise pollution in cities and towns. In order to take control measures on the exhaust noise and rack vibration of this tractor, the noise control research team of our school, in cooperation with the Tractor Institute of Yuncheng Tractor Factory, conducted a study on the noise control of small four-wheel tractors from August 1983 jobs. After more than a year of exploration, calculation and many experiments, finally achieved remarkable results in noise control. Thirty-one representatives from 19 institutions including universities and institutes, research institutes and specialized factories in and outside the province attending the scientific and technological achievements appraisal concluded that this achievement enables 12 hp (120) and 15 hp (150) The environmental (dynamic) noise of a small four-wheel tractor is reduced below 82 dB (A) and the noise near the driver’s ear is reduced below 94 dB (A). This noise