大振幅非线性纯净驻波场的获取及其声学特性的实验研究

The research on the generation and the extremely nonlinear properties of high amplitude standing-wave field are of great significance to the final establishment and the practical application of nonlinear standing-wave field theory. In this study, the sound source which is composed of big-caliber high-power loudspeaker and conical mouth will be optimized so as to facilitate the output of acoustic power and improve the energy efficiency ratio of such sound sources, and meanwhile, the effect of the non-linearity generated by the sound source on the acoustic field in the standing-wave tube will be studied in detail. The standing-wave tube with uniform section, the two-step standing-wave tube with abrupt section, the three-step standing-wave tube with tapered section and the standing-wave tube with tapered section will be optimized. In reducing the effects of the non-linearity generated by the sound source to the standing-wave field of standing-wave tube, the extreme nonlinear pure standing wave fields of 185 dB and above would be obtained in these standing-wave tubes. The extremely nonlinear properties of the extremely nonlinear standing-wave field and the method how to obtain the extremely nonlinear standing-wave field would be investigated. The results will provide a reliable experimental basis for the final establishment of the nonlinear standing-wave field theory and the practical application of the extremely nonlinear pure standing-wave field.

大振幅纯净驻波场的获取及其极端非线性性质的实验研究对大振幅非线性驻波场理论的最终建立及实际应用具有非常重要的意义。我们将对由大口径高功率扬声器与锥形口组合而成的声源进行优化设计，以利于声源声功的输出，提高此类声源的能效比。对声源及其声场在高声压级下产生的非线性给驻波管内驻波场带来的影响进行详细的实验研究，在降低声源非线性给驻波场带来的影响的同时，通过对等截面、两级突变截面、三级锥形渐变截面以及锥形渐变截面等不同管型驻波管声学性质的研究和优化设计，获取声压级为185dB及以上的极端非线性纯净驻波场，以研究大振幅驻波场的极端非线性性质以及获取极端非线性纯净驻波场的方法，从而为大振幅非线性驻波场理论的最终建立以及极端非线性纯净驻波场的实际应用提供可靠的实验依据。

大振幅纯净驻波场的获取及其极端非线性性质的实验研究对大振幅非线性驻波场理论的最终建立以及实际应用具有非常重要的意义。我们对由大口径高功率扬声器与锥形口组合而成的声源进行了优化设计，以利于声源声功的输出，提高此类声源的能效比。对声源及其声场在高声压级下产生的非线性给驻波管内驻波场带来的影响进行了详细的实验研究，在降低声源非线性给驻波场带来的影响的同时，通过对等截面、两级突变截面、三级渐变截面以及锥形渐变截面等不同管型驻波管声学性质的研究和优化设计，获得了声压级为185dB及以上的极端非线性纯净驻波场，并研究了大振幅驻波场的极端非线性性质以及获取极端非线性纯净驻波场的方法，从而为大振幅非线性驻波场理论的最终建立以及极端非线性纯净驻波场的实际应用提供可靠的实验依据。