摘要
机体是汽车发动机的主体结构,其动态特性影响发动机的振动和噪声,对机体的模态分析有助于机体动态特性识别及性能改进。以往的模态分析均局限于自由模态分析,但是系统的约束对其动态特性起到决定性作用。为使仿真计算能够真实反映机体的动态特性,应用I-Deas软件分析了机体实际工作情况下的约束模态,并利用脉冲激振进行了机体的模态试验,试验结果验证了理论模型的正确性,并提出了合理的减振和降噪措施。
Engine block is the primary part of Internal Combustion Engine (ICE), whose dynamic-characteristics influences ICE's vibration and noise behaviors directly. Modal analysis of engine block is very helpful for its system identifying and performance improvement. Although restriction character is of great effect on system character, conventional modal analysis in literatures is usually confined to free mode state. In order that the simulation embodies the block dynamic-character, FEM (Finite Element Method) model of a 3-cylinders ICE is built in I-Deas environment and restraint modal analysis is carried out. Then modal test is done and the result proves the correctness of the theoretical model. Based on the analysis, reasonable measures of reducing vibration and noise are brought forward.
出处
《振动与冲击》
EI
CSCD
北大核心
2005年第3期62-64,i006,共4页
Journal of Vibration and Shock
关键词
有限元方法
模态分析
模态试验
三缸发动机
机体
Engine cylinders
Finite element method
Mathematical models
Modal analysis
Vibrations (mechanical)
