CAJ | 학술논문

在某卡车驾驶室结构有限元与声学有限元计算以及驾驶室声固耦合建模的基础上，进行结构模态计算分析以及试验验证。再进行声学模态分析以及声固耦合系统模态分析。考虑声—固耦合作用，利用耦合声学有限元进行了驾驶室内部声学特性研究，识别出主要噪声频率。继而进行面板声学和模态贡献量分析，找到了峰值声压产生的主要原因，确定了贡献显著的面板。通过结构改进，提升了板件刚度，抑制了结构振动，试验结果表明，驾驶室内部噪声得到较明显下降。
재모잡차가사실결구유한원여성학유한원계산이급가사실성고우합건모적기출상，진행결구모태계산분석이급시험험증。재진행성학모태분석이급성고우합계통모태분석。고필성—고우합작용，이용우합성학유한원진행료가사실내부성학특성연구，식별출주요조성빈솔。계이진행면판성학화모태공헌량분석，조도료봉치성압산생적주요원인，학정료공헌현저적면판。통과결구개진，제승료판건강도，억제료결구진동，시험결과표명，가사실내부조성득도교명현하강。
The structural finite element model, acoustic finite element model and the structural-acoustic coupling finite element model for a cab were established respectively. The modal analyses of the three models were carried out and verified by testing. The acoustic properties of the internal cavity of the cab were analyzed using the structural-acoustic coupling finite element model, and the main noise frequencies were recognized. Combining the panel acoustic contribution analysis method with the modal contribution analysis method, the major factors causing peak sound pressure were discovered, and the panel with significant contribution to the noise at the main noise frequencies was identified. The stiffness of the panel was raised and its vibration was controlled through the structural modification. The experimental result shows that the internal noise of the cab is reduced obviously.