摘要
由于新舟60飞机APU排气噪声辐射较严重,为了确定一种最佳的降噪方案,必须对新舟60飞机APU排气噪声的频谱特性和指向性进行测量并分析。从测量结果可以看出,无论APU工作在哪种工作状态,排气噪声均属于宽频噪声,主要是1000Hz以上的高频噪声,而满负载状态下的排气噪声除了高频含量之外,在400~1000HZ范围内也有较强的噪声。另外还发现,排气噪声有非常强的方向性。
The exhaust noise radiation of A PU(Auxiliary power units)on MA60 aircraft is serious.Effective sound treatment t echnology should be adopted for controlling exhaust noise.For finding best metho d for reduction of APU exhaust noise,the noise spectrum and directivity should b e measured.The measured spectrum of APU exhaust noise show that typeical exhaust noise spectrum is very broad.Two general regions can be distinguished.A broad h ump of low frequency random noise centering in the 4001000Hz region normally i s present,which often is substantially stronger with load.A second broad hump of high frequency random noise centers in speech interference region 10005000Hz, which is the frequency range of the ear's greatest acuity.
出处
《噪声与振动控制》
CSCD
2003年第3期43-44,48,共3页
Noise and Vibration Control