CAJ | 학술논문

为了探究汽车排气系统波纹管简化模型的合理性，对简化模型进行数值分析和理论研究。首先，以某重型卡车排气系统为研究对象建立有限元模型，将波纹管简化为零长度的CBUSH单元，对系统自由模态进行分析；其次，用波纹管将排气系统分隔开简化为二自由度模型进行理论计算；最后，综合对比分析表明，第7阶和第8阶模态频率接近于零，主要原因是绕 X，Z轴刚度较小，验证了波纹管在该方向的隔振效果良好。理论方法与数值计算具有普遍性和工程指导意义。
위료탐구기차배기계통파문관간화모형적합이성，대간화모형진행수치분석화이론연구。수선，이모중형잡차배기계통위연구대상건립유한원모형，장파문관간화위령장도적CBUSH단원，대계통자유모태진행분석；기차，용파문관장배기계통분격개간화위이자유도모형진행이론계산；최후，종합대비분석표명，제7계화제8계모태빈솔접근우령，주요원인시요 X，Z축강도교소，험증료파문관재해방향적격진효과량호。이론방법여수치계산구유보편성화공정지도의의。
In order to explore the rationality of simplified model of bellows in exhaust system ,nu‐merical analysis and theoretical study for the simplified model were developed in the project . Firstly ,a heavy truck exhaust system was used as the research target to build a finite element model and the bellows was simplified as zero‐length CBUSH unit to analyze the exhaust system's freedom modal .Secondly ,in order to conduct the theoretical calculation ,the exhaust system was divided into two degree of freedom model using bellows .Finally ,the comprehensive comparison and analysis result that the 7th and 8th modal frequencies were both close to zero ,which was mainly resulted from the weak stiffness rotated around the X and Z axis .It also met the desired research result and verified the premise of good vibration isolation effect of bellow s in the X and Z axis .Furthermore ,the theoretical method and numerical calculation are universal and have engi‐neering guiding significance .