基于小波变换对氢发动机异常燃烧的研究  

RESEARCH ON ABNORMAL COMBUSTION OF HYDROGEN-FUELED ENGINE USING WAVELET TRANSFORM

作　　者：杨振中[1] 刘海朝[1] 田光旭[1] 王丽君[1] 司爱国[1] 裴普成[2] 

机构地区：[1]华北水利水电学院机械学院,郑州450011 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《太阳能学报》2008年第6期700-704,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50322262);清华大学汽车安全与节能国家重点实验室开放基金(KF2006-01);河南省科技计划项目(0524260028)

摘　　要：利用缸内压力研究氢发动机的异常燃烧。分别对氢发动机正常燃烧和早燃压力信号进行了小波变换,通过分析比较其频带分布特点,计算出不同尺度上小波能量,以此作为基础构造特征向量,进行异常燃烧诊断,结果表明小波变换可以有效地诊断氢发动机的异常燃烧现象。The research on the abnormal combustion in hydrogen-fueled engines was conducted based on the pressure signals in cylinder of combustion process in the paper. The pressure signals of hydrogen-fueled engine possess unstable and time-invariant characteristic, containing a lot of information of abnormal combustion that can be extracted by wavelet transform. The pressure signals of normal combustion and preignition were transformed by wavelet. By analyzing and comparing the spectrum feature of wavelet transform, the wavelet energy of different scales was computed and used to diagnose abnormal combustion. The result shows that wavelet transform is effective and feasible to diagnose abnormal combustion of hydrogen-fueled engine.

关 键 词：氢燃料发动机 异常燃烧 小波分析 故障诊断 

分 类 号：TK91[动力工程及工程热物理]