自适应广义S变换在内燃机气缸盖振动特性研究中的应用  

Application of adaptive generalized S-transformation in vibration characteristics analysis of an IC engine cylinder head

作　　者：郑旭[1] 郝志勇[1] 金阳[1] 卢兆刚[1] 

机构地区：[1]浙江大学能源工程系,杭州310027

出　　处：《振动与冲击》2011年第1期167-170,共4页Journal of Vibration and Shock

摘　　要：提出了一种基于时频分辨率最优化的自适应广义S变换,并通过仿真试验,比较了自适应广义S变换与短时博里叶变换和S变换的时频分析结果,证明了自适应广义S变换具有更高的时频分辨率。对某4缸4冲程柴油时机气缸盖的振动信号进行时频分析,结果表明自适应广义S变换得到的时频分布比S变换具有更高的时频分辨率,能够较为准确地分辨出气缸盖振动的主要激励源及其时频特性,研究结论可为低振动噪声内燃机改进设计提供指导。An adaptive generalized S-transformation （AGST） was introduced here. A simulation showed that the time-frequency resolution obtained with AGST is better than those with S-transformation and STFT. Then, the proposed method was introduced to analyze the vibration characteristics of a cylinder head of a four-cylinder internal combustion （IC） engine. The results indicated that the time-frequency representation obtained with AGST method has a better time- frequency resolution than that with S-transformation, and can exactly reveal the vibration characteristics of the IC engine cylinder head. The study achievements could provide a guidance for the further study on vibration control and structural optimization of IC engines.

关 键 词：内燃机 气缸盖 振动 自适应广义S变换 时频分辨率 

分 类 号：TK417[动力工程及工程热物理—动力机械及工程]