内燃机镁、铝铸件NVH性能比较研究  

Comparison of NVH Performance of Magnesium Alloy Casting and Aluminium Alloy Casting

作　　者：郑光泰[1] 郝志勇[1] 蔡军 毛溶洁 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027 [2]重庆长安汽车股份有限公司

出　　处：《内燃机工程》2008年第2期81-84,共4页Chinese Internal Combustion Engine Engineering

基　　金：“十一五”国家科技支撑计划项目;国家自然科学基金(10672141)

摘　　要：以某型号汽油机油底壳为例,运用有限元/边界元法对相同体积的镁、铝合金结构各自的NVH性能进行对比分析。首先运用自由悬挂的支撑方式对油底壳进行了模态识别试验,并对结构进行了表面振动测试和噪声识别,发现结构在1400 Hz左右振动最为剧烈。仿真方面,用有限元法计算了铝合金油底壳模态频率,计算值和试验值吻合较好,而相同结构镁合金油底壳固有频率比原油底壳稍低;频响计算结果表明,相同激励下镁合金油底壳由于材料优良的阻尼性能结构响应小于铝合金油底壳;最后运用边界元法进行噪声辐射分析结果显示,镁合金油底壳噪声总声功率级低于铝合金油底壳噪声总声功率级。The NVH perforamance of magnesium alloy oil sump and aluminium alloy oil sump was analyzed and compared by using FEM/BEM method. Modal parameter verifying was carried out with oil sump suspended freely. The structure surface vibration was tested,and it was found that the vibration around 1 400 Hz was the most intensive. Modal frequency of aluminium alloy oil sump was firstly calculated and it was found that the modal frequency of magnesium alloy oil sump was somewhat smaller than that of original oil sump. The analysis of frequency response indicated that the structure response of magnesium alloy oil sump was less than that of aluminium alloy oil sump under the same load due to its good damping property. The noise radiation is analyzed by using BEM method. The result indicated that the total sound power level of magnesium alloy oil sump was lower than that of aluminium alloy oil sump.

关 键 词：内燃机 汽车发动机 镁合金 NVH性能 

分 类 号：TK415[动力工程及工程热物理—动力机械及工程]