항공기 탑재물의 음향환경 검증을 위한 고에너지 음향환경시험 튜브 개발

A high intensity progressive wave tube is installed at Korea Aerospace Research Institute (KARI) for acoustic environmental tests. The test facility has 800 mm x 800 mm cross-sectional area, and provides acoustic environment of 140 ~ 160dB over the frequency range of 25 Hz ~ 10,000 Hz. The facility consists of a 9 m long acoustic wave tube, acoustic power generation systems, gases nitrogen supply systems, and acoustic control systems. This paper describes how the basic parameters of the facility and power generation systems are controlled to meet the requirement of the test. The shape and length of the tube has been designed by using the size of test objects and the wave propagation characteristics of the tube. The capacity of acoustic power generation systems is determined by the energy conversion of acoustic wave and the efficiency of acoustic modulators. Moreover, the paper introduces test run results of the tube.