四、噪声及振动测试噪声和振动是共生的两种物理现象,因而噪声测量和振动测试所用测试方法测试设备就自然而然地有许多共同之处。正因为如此,我们就把它们放在一起来叙述。我国目前对汽车噪声的限制并不很严(车外噪声 86dB),但会逐步严格起来。国内对噪声的研究、测试、分析都已具有一定的条件和水平。例如噪声测试的条件方面,同济大学、中国科学院声学所都有消声室、混响室。同济大学消声室的内尺寸为长×宽 Noise and Vibration Testing Noise and vibration are two physical phenomena of symbiosis. Therefore, the test methods used for noise measurement and vibration testing have many things in common. Because of this, we put them together to describe. China’s current restrictions on vehicle noise is not very strict (noise 86dB), but will gradually be strict. Domestic noise on the research, testing, analysis have had certain conditions and levels. For example, the conditions of noise testing, Tongji University, Chinese Academy of Sciences Acoustics have anechoic room, reverberation room. Tongji University anechoic chamber of the internal dimensions of length × width