Microperforated Panel Sound Absorbing Structure In Aircraft Noise Reduction Engineering Research

With the more and more air-transport in modern society, noise pollution problem caused by large airplanes has brought up much more attention. In the development of commercial airplane in china. aircraft noise is an important problem for the larger noise level. The MA60 is one of the new commercial aircraft in china. In the design and producer of this airplane, the noise from the APU of this plane is very large and need to be reduced.It is the propose of this paper to develop a method to reduce the noise level of MA60 APU without more weighting and other infection on airplane. To accomplish this object, a new type of micro perforated absorber is used. First, the theoretical analysis about the micro perforated absorber is present in this paper. Then, the source noise of the APU of MA60 is obtained by the outside test in airport. Based on the test result, a micro perforated absorber is designed and produced. At last, the test for the MA60 APU noise with the micro perforated absorber is present in this paper. Experiment results show that an obvious reduction has be obtained using this micro perforated absorber.