The Application Of Microphone In Complex Environments

Aircraft flying in the structure of the boot process as well as engines, servo system, in the noise inherent in a complex environment, with the continuous improvement of flight performance, aircraft noise environment of strong growing impact of its structure, leading to aircraft structural acoustic fatigue damage, a serious threat to the safety of aircraft. On the electronic device also had a negative impact. Therefore, accurate measurement of noise parameters on the evaluation of the overall vehicle, and analyzed the flight of great significance. On the other hand, has a frequency bandwidth of noise parameters, dynamic range, elements of uncertainty, the ground can not simulate the characteristics of real-time measurement of aircraft noise for the live environment of the harsh demands。The main noise in high-speed airflow environment, temperature and vibration environment, environmental noise testing carried out some research. Microphone diaphragm through the establishment of a theoretical model, describes the mechanical and electrical microphone transducer principle, the microphone in the vehicle vibration environment, the projectile surface temperature and wind speed market environment environmental impact under a simple theory. Focus on high-speed airflow for the specific aircraft environment, the surface temperature and vibration environment, a theoretical analysis, the specific environment of each model. And in accordance with aircraft flight environment model of high-speed airflow, the surface temperature and vibration environment, environmental models model, some related experiments, analysis of the data obtained through the microphone with the environmental changes of the curve, the sound pressure level for the test environment to provide correction reference. Finally, the conclusions related experiments, were summarized in the vibration microphone, playing surface temperature environment, and application of high-speed airflow environment should pay attention to the aspects and to reduce the error of the measures can be taken, based on this microphone in the consolidated environment, application and selection has made some general considerations, in order to better measurement microphone noise and correct choice of reference.