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由中国船舶工业总公司第九设计研究院设计、浙江慈溪金属消声配件厂加工安装的上海电机行业第一个精密级半消声室,已在上海南洋电机厂通过了鉴定。该消声室组合于该厂综合楼底层,占地面积56m~2,四壁和顶棚悬挂长为600mm的吸声尖劈后,消声室净空尺寸长×宽×高=5.36×5.02×4.23m。实测消声室背境噪声为A声级15dB,低限测试频率为100Hz,符合ISO3745精密半消声室测试精度要求自由声场半径为1.50m的规定,可以对8号机座以下的电机以及其他小型机电产品的噪
Designed by the Ninth Design Institute of China State Shipbuilding Corporation, the first precision semi-anechoic chamber of Shanghai motor industry, which was processed and installed by Cixi Metal Silencing Parts Factory in Zhejiang Province, has passed the appraisal at Shanghai Nanyang Electric Machinery Factory. The anechoic chamber combination of the plant floor of the complex, covers an area of 56m ~ 2, four walls and ceiling suspension length of 600mm after the acoustic wedge split, anechoic chamber clearance dimension length × width × height = 5.36 × 5.02 × 4.23 m. The measured background noise of the anechoic chamber is 15dB for A sound level and 100Hz for low limit test, which meets the requirements of ISO3745 precision semi-anechoic room test. The radius of free sound field is 1.50m, and the motor below No. 8 base and other Small mechanical and electrical noise