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一、引言励磁机是电厂发电机组的主要噪声源之一。励磁机噪声主要来源于机内冷却风扇的高速旋转,它通过进、出风口及机壳向周围空间辐射。在励磁机近旁,不但噪声级很高,而且噪声频谱呈中、高频特性,处于人耳听觉的敏感区域,因此,它对操作人员的危害很大。要对发电厂的发电机组噪声进行综合治理,首先应当控制励磁机的噪声。考虑到目前国内电厂对励磁机的使用情况,选点治理的代表性机型为上海电机厂生产的ELG-550-30,其规格为:容量:550KW,额定电压:300V,额定电流:1830A。由于励磁机的所有发声源均处于机壳的围蔽之中,而机壳又是用6mm厚的钢板制作,已具有足够高的隔声量,因
I. INTRODUCTION Exciter is one of the main noise sources of power plant generator set. Exciter noise comes mainly from the high-speed rotation of the cooling fan in the machine. It radiates into the surrounding space through the air inlet and air outlet and the casing. In the vicinity of the exciter, not only the noise level is very high, but also the noise spectrum is medium and high frequency, which is in the sensitive area of human ear. Therefore, it is very harmful to operators. To comprehensively control the power plant noise of the power plant, the noise of the exciter should be controlled firstly. Taking into account the current domestic power plant on the use of exciter, the representative of the selected point of governance for the production of the Shanghai Electric Factory ELG-550-30, its specifications are: capacity: 550KW, rated voltage: 300V, rated current: 1830A. Since all the sound sources of the exciter are in the enclosure of the enclosure, the enclosure is made of 6mm thick steel plate and has a sufficiently high sound insulation due to