摘要
利用薄板理论建立了汽车驾驶室壁板的微分振动方程。对驾驶室进行了试验模态分析,得出固有频率和基本振型变化。发现顶板和后壁板振动最大,采用辛几何法计算出了驾驶室顶板和后壁板的固有频率,其值与试验值基本一致,对驾驶室后壁板和顶板分别采用敷贴阻尼材料和加筋板的降噪方法,利用声辐射理论,对改进后的驾驶室降噪效果进行了数值模拟,结果表明,壁板固有频率处的辐射功率和辐射声压级最大,与理论分析相符,并且改进后的驾驶室内部噪声明显降低。
Differential equation of vibration of vehicle cab panel is established based on theory of thin plate, experimental modal analysis of cab is carried out, inherent frequency and change of basic vibration mode are ob- tained. It is found that vibration of roof and rear siding is most intense. The inherent frequency of roof and rear sid- ing is calculated according to the symplectic geometry method, whose value basically consistents with experimental data. The noise reduction method, through plastering damping material, is used to rear siding of cab, and noise re- duction method, through stiffening plate, is used to roof of cab. Numerical simulation on noise reduction effect of cab improved is carried out by theory of sound radiation. The result shows that radiation power and sound pressure level of radiation when siding is in inherent frequency are largest, which consistent with theoretical analysis. The internal noise of cab improved is decreased obviously.
出处
《科学技术与工程》
北大核心
2012年第35期9596-9601,共6页
Science Technology and Engineering
基金
江苏省教育厅自然基金项目(11KJB580001)
江苏技术师范学院基础及应用基础研究基金项目(KYY06092)资助
关键词
声压
薄板理论
降噪与结构设计
结构-声耦合
sound pressure theory of thin plate noise reduction and structure design coupling be-tween structure and sound
