固体发动机静止试验噪声分析的新途径

喷流噪声和气动噪声引起的声振是固体发动机静止试验时最严重的振环境。噪声分析通常是用精密声级计和滤波器，倍频程谱分析需用１１个档位的滤波器，１／３倍频程则需用３４个档位的滤波器。

A New Approach to Noise Analysis of Solid Rocket Motor Static Tests

The acoustic vibration generated by jet flow noise and Sas dynamic noise is the most serious vibrating environment during solid rocket motor static tests. Noise analysis is generally taken by means of precision sound level meters and filters. Filters with 11 steps and 34 steps are necessary for octave spectrums analysis and 1/3 octave spectrum analysis respectively. On the basis of theory analysis a new way is developed.According to the way, the sound pressure level spectrum of noise can be gotten directly from the autopower spectrum density function. Thus, the new approach has high practical value and special devices for noise analysis can be omited.