| 基于连续小波变换的内燃机瞬态工况噪声信号时频特性研究 |
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| 引用本文： | 徐红梅,陈传艳.基于连续小波变换的内燃机瞬态工况噪声信号时频特性研究[J].小型内燃机与摩托车,2011,40(1):24-26,45. |
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| 作者姓名： | 徐红梅 陈传艳 |
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| 作者单位： | 1. 华中农业大学工程技术学院,湖北,武汉,430070
2. 武汉水利水电职业技术学院 |
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| 基金项目： | 华中农业大学自主科技创新基金(2010QC007) |
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| 摘 要： | 以某四缸汽油机为研究对象,发动机加速过程中,对前端噪声信号进行测试,并对采集的噪声信号进行等长度分段预处理。采用连续小波变换方法分别对各数据段的噪声信号进行时频分析处理,分析噪声信号能量在时频域内的分布规律,以及其主要频率成分随转速或时间变化的特性。结果表明,发动机加速过程中,噪声信号能量主要集中在2阶主谐次和转动基频构成的线性调频带附近,而且随着转速的升高,调频带附近的信号幅值和能量也随之增大。在调频带上方也分布着一些频率成分,但是其幅值和能量相对较小,而且随着转速的升高,其频率成分越来越丰富,能量分布也越来越广泛。
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| 关 键 词： | 内燃机 瞬态工况 噪声信号 连续小波变换 时频特性 |
Study on the Time-frequency Characteristics of Engine Noise Signal with Transient Workload Based on Continuous Wavelet Transform |
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| Xu Hongmei,Chen Chuanyan.Study on the Time-frequency Characteristics of Engine Noise Signal with Transient Workload Based on Continuous Wavelet Transform[J].Small Internal Combustion Engine and Motorcycle,2011,40(1):24-26,45. |
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| Authors: | Xu Hongmei Chen Chuanyan |
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| Affiliation: | Xu Hongmei1,Chen Chuanyan2 1-Engineering and Technology College,Huazhong Agricaltural University(Wuhan,Hubei,430070,China)2-Wuhan Technical College of Water Resources and Electric Engineering |
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| Abstract: | Taking a four-cylinder gasoline engine as example,the front-end noise signal was recorded in acceleration and subdivided into several segments with the same length.Afterwards,continuous wavelet transform was adopted to analyze the data segments in time-frequency domain.The energy distribution of noise signals and variance of their predominant frequency components with time or engine speed were subsequently investigated.The results demonstrate that the energy of noise signal is concentrated nearby the 2-orde... |
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| Keywords: | Internal combustion engine Transient workload Noise signal Continuous wavelet transform Time-frequency characteristic |
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