Physical acoustics includes. Superacoustics. Hydroacoustics. Acoustics is an ancient and young discipline, because it has a long history, and modern acoustics research has widely penetrated into scientific research, national economy and national defense construction, and has formed some new interdisciplinary subjects. A large number of applications have been studied in the field of physical acoustics. For example, the research of ultrasonic motor has been supported by many national funds. In 200 1 year, China developed the thinnest bending and rotating ultrasonic motor in the world. In basic research, Chinese physicists found directional waves in the study of nonlinear dynamics of liquid crystals and won the scientific and technological progress award of the State Education Commission.
About 200 papers on physical acoustics have been published in China. Nearly 20 national invention patents have been obtained in the field of physical acoustics, and most of the research in the field of acoustics has been supported by various funds or enterprises. So far, more than 10 projects in the field of physical acoustics have won national and ministerial awards.
The main research topics in the field of modern physical acoustics in China include: ultrasonic motor, thermoacoustic refrigeration, sonoluminescence, reflection and transmission of limited time and space waves on the interface, Hall reverberation, magnetohydrodynamic sound waves and the application of sound waves in engineering detection.