具加劲复合材料结构板之声传研究-国立交通大学机构典藏.pdfVIP

料 金 立 不 料 行料 來落 滑 料 異 異 來 理論利 ANSYS 不 料參 數 數 數 力 ANSYS便 不 料行 MLSSA 理論 論說 I Sound Radiation Analysis of Stiffened Composite Panels Student Kuo-Chin Peng Advisor Dr. Tai-Yan Kam Institute of Mechanical Engineering National Chiao Tung University ABSTRACT The effects on sound radiation of composite panels with different stiffened designs are studied in this thesis. This study is used to design the stiffened composite panels with enough stiffness which can avoid the fluctuation of sound pressure. By investigating the differences among the behaviors of sound pressure responses of four types of stiffened plates and an unstiffened one, we obtain a structural design which can effectively modify the stiffness of a plate structure and its sound radiation behavior. For theoretical analysis, the simulation models of radiating panels with different designs of stiffeners were constructed using the software ANSYS. The amplitudes and the phases of these panels were obtained from the analyses of the simulation models using given system parameters such as spring constants of suspension and damper, the thrust of the voice coil and the damping ratio of the loudspeaker system, which were measured from experiments. Then, we use the amplitudes and the phases in the program of calculation of sound pressure level to simulate II the behaviors of sound radiation of the loudspeakers.