1.绪言:近年来,随着水中吸声材料的必要性增大,设计并制造了各种吸声材料。可是测定表现水中吸声材料声学性能的种种声学常数的报告好像基本上还没有。测定这些常数,对于吸声机理的研究、吸声材料的设计、制造工艺的管理、制品的检查都是最重要的参数。作者从用 1. INTRODUCTION In recent years, various acoustic absorbing materials have been designed and manufactured as the need for sound absorbing materials in water has increased. However, the determination of the various acoustical constants that characterize the acoustical properties of water-absorbing materials in water appears to be essentially nonexistent. The determination of these constants is the most important parameter for the study of the mechanism of sound absorption, the design of the sound absorbing material, the management of the manufacturing process, the inspection of the product. From the author