一、前言目前国內內燃机车司机室的噪声水平较高,以东风_4型为例,其噪声为83～90分贝(A)左右,地板振动为0.14～0.28g。机车司机在这种噪声环境下长期工作,不但容易引起听力下降,而且对心血管、神经系统产生不良影响,并干扰语言通话,直接影响行车安全[1,2]。因此,我所从1975年开 I. Introduction At present, the noise level of domestic diesel locomotive cabs is high. Taking DF_4 as an example, the noise is about 83-90 dB (A) and the floor vibration is 0.14-0.28 g. Locomotive drivers working in this noisy environment for a long time not only easily cause hearing loss, but also have adverse effects on the cardiovascular and nervous systems, and interfere with voice calls, directly affecting traffic safety [1,2]. So I opened it in 1975