内燃机结构模态分析的谱均衡瞬态随机激励  

Spectrum Equalization Burst Random Excitation for Structure Modal Analysis of Internal Combustion Engines

作　　者：杨庆佛[1] 熊诗波[1] 李衍 

机构地区：[1]太原工业大学

出　　处：《内燃机学报》1990年第2期104-110,共7页Transactions of Csice

摘　　要：减小内燃机缸体振动,将减小由缸体本身、油底壳和安装在它上面的其它部件的辐射噪声。实验模态分析是预测缸体结构振动和辐射噪声的有效手段。由测量数据估计频响函数是缸体结构实验模态分析的前期步骤,最终的预测结果在很大程度上依赖于频响函数的估计精度。本文提出使用谱均衡瞬态随机激励方法,以改善结构频响函数的估计精度。文中给出的内燃机缸体试验结果表明,使用这种激励可以得到这类结构频响函数的最佳线性估计。Reducing engine cylinder block vibration will lead to a reduction inthe noise radiated by the cylinder block itself,the oil sump and other partswhich are mechanically attached to the block.Experimental modal analysisis an effective means for the prediction of vibration and radiated noise ofthe cylinder block structure.The estimation of the Frequency ResponseFunction(FRF)from measured data is an early step in the experimentalmodal analysis of the cylinder block structure.The final predicted resultslargely depend on estimation accuracy of the FRF.This paper provides a method using spectrum equalization burst randomexcitation to improve accuracy for estimation of the FRF.Test results forcylinder block of the internal combustion engines are given,it shows thatoptimal linear estimation of the FRF for this type of structure can beobtained by using this excitation.

关 键 词：内燃机 结构 模态分析 随机 激励 

分 类 号：TK413[动力工程及工程热物理—动力机械及工程]