我厂在新产品研制过程中,应用3ND_2型精密声级计和倍频程滤波器,对JJKX1型建筑卷扬机五台样机进行了噪声测试、频谱分析,并采取了相应的降噪措施,取得了较好的效果。在工业试验现场对两台试验样机的测试中,我们将传声器布置在操作工人的头部。当 In the new product development process, our factory applied 3ND_2 type precision sound level meter and octave band filter to perform noise test and frequency spectrum analysis on five prototypes of JJKX1 construction winch and adopted corresponding noise reduction measures. Better results. In the test of two test prototypes at the industrial test site, we placed the microphone on the head of the operator. when