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半消声室建在楼层上,受结构等条件的限制,给隔声设计带来许多困难.这里全面地介绍一项比较成功的经验.这一经验对其它有高隔声要求的工程也可适用.概况 上海电器二厂是专业生产缝纫机所用的电动机.为了提高产品质量,要求电动机抽样作噪声测试,因此希望在新建成的装配车间(在大楼二层)内布置一间半消声室.同时也供改进电动机噪声的研究之用.目前该项产品的噪声级指标约在50dBA,主要频率分布在500—1000Hz,不久将有可能要求降至45dBA.根据测试要求.室内安静标准应在35dBA以下.
The semi-anechoic chamber, built on the floor, is subject to structural and other constraints that create difficulties for the design of the sound insulation. A more complete overview of a more successful experience is available here, as is the experience with other projects that require high sound insulation Shanghai Electrical Equipment Factory is a professional manufacturer of sewing machines used in the motor.In order to improve product quality, motor sampling is required for noise testing, so I hope in the newly built assembly shop (on the second floor of the building) within the layout of a semi-anechoic chamber. At the same time also for the improvement of motor noise research purposes.Now the product noise level index of about 50dBA, the main frequency distribution in the 500-1000Hz, will likely be required to drop to 45dBA.According to the test requirements. Indoor quietness standards should be 35dBA the following.