柴油机喷油系统压力波时频特性研究

何勇灵; 闫志强

柴油机喷油系统压力波时频特性研究

北京航空航天大学汽车工程系, 北京 100083

基金项目: 凡舟基金资助项目(20031305)

详细信息

作者简介:
何勇灵(1963-),男,广西藤县人,教授, xkbhe@buaa.edu.cn.

中图分类号: TK 421⁺.44
计量
- 文章访问数: 2204
- HTML全文浏览量: 74
- PDF下载量: 938
- 被引次数: 0
出版历程
- 收稿日期: 2004-12-02
- 网络出版日期: 2006-02-28

Time-frequency characteristics research for pressure waves of fuel injection system of diesel engine

Dept. of Automobile Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 在柴油机喷油系统压力波的研究中,采用Wigner-Ville分布算法,对液-汽两相流条件下的柴油机喷油系统压力波的时频特性进行了分析,并与采用小波函数分析得到的结果进行了对比.研究结果表明,采用Wigner-Ville分布算法进行分析时,可以更好地显示出液-汽两相流条件下的柴油机喷油系统中压力波在时间和频率范围内的能量密度,能更清晰地反映出这种非稳态信号频率随时间变化的关系.当喷油系统存在长时间存活汽泡时,压力波的能量密度主要集中在主波上,除了低频率的能量外,还包着相当一部分较高频率的能量.而压力波次波则没有高频能量的出现.当喷油系统存在短时间存活汽泡时,其压力主波对应的频率较低,但能量密度比较大,而其压力次波具有一定量的高频率能量.
- 柴油机 /
- 喷油系统 /
- 压力波 /
- 时频特性
Abstract: In research of pressure wave of fuel injection system of diesel engine, with Wigner-Ville distribution, the time-frequency characteristics of pressure wave in fuel injection system of a diesel engine under condition of liquid-gas tow-phase flow was analyzed. The comparison of its results with the results of wavelet function analysis was made. The results show that using Wigner-Ville distribution the energy density of pressure wave of fuel injection system in time and frequency field can be better described and the change of frequency of this unstable signal with time can be better reflect. When long living time cavitation existed in fuel injection system, the energy density of pressure wave, which included some high frequency energy besides low frequency energy in this energy, concentrates mostly on the first pressure wave and there is not any high frequency energy in the second pressure wave. When short living time cavitation existed in fuel injection system, frequency of first pressure wave is low and the energy density is high. And there is some high frequency energy in the second pressure wave.
- diesel engine /
- fuel injection system /
- pressure wave /
- time-frequency characteristics

HTML全文

参考文献(1)

[1] 陈桂明,张明照,戚红雨. 应用MATABLE语言处理数字信号与数据图像[M] 北京:科学出版社,2000 Chen Guiming, Zhang Mingzhao, Qi Hongyu. Deal with digital signal and image by matable language [M] Beiing:Science Press, 2000(in Chinese) [2] 胡昌华. 基于MATLAB的系统分析与设计:小波分析[M] 西安:西安电子科技大学出版社,1999 Hu Changhua. System analysis and design base on MATLAB:wavelet analysis [M] Xi'an:Xidian University Press, 1999(in Chinese) [3] Stephane Mallat(法)著. 信号处理的小波导引[M] 北京:机械工业出版社,2002 Stephane Mallat (France). Wavelet guide of deal with signal[M] Beijing:China Machine Press, 2002(in Chinese) [4] He Yongling, Yan Long, Zong Yongping, et al. A wavelet analysis on frequency characteristics of pressure wave of fuel injection system of diesel engine .In:2nd International Symposium on Instrumentation Science and Technology . Harbin:The Press In Harbin Institute of Technology,2002. 3-881~3-886 [5] 何勇灵,颜龙,宗永平,等.基于柴油机喷油系统压力波信号的小波函数优化分析[J] 内燃机工程, 2003,24(1):13~17 He Yongling, Yan Long, Zong Yongping,et al. An optimum analysis of wavelet functions based on signal of pressure wave of diesel fuel injection system[J] Chinese Internal Combustion Engine Engineering, 2003,24(1):13~17(in Chinese). [6] 张振仁,石林锁,王成栋,等. 基于小波分析和时域分析的柴油机气缸压力识别[J] 内燃机学报,1999,17(2):181~186 Zhang Zhenren, Shi Linsuo,Wang Chengdong,et al. Identification of diesel cylinder pressure base on wavelet analysis and time series analysis[J] Transaction of Chinese Society for Internal Combustion Engine, 1999,17(2):181~186(in Chinese) [7] 何勇灵,刘建新,李民,等.农用柴油机喷油系统中液--汽两相流动过程的试验研究[J] 农业工程学报,2000,16(1):31~34 He Yongling, Liu Jianxin, Li Min, et al. An experiment investigation on process of two-phase flow in fuel injection system of agricultural diesel engine[J] Transaction of the Chinese Society of Agricultural Engineering, 2000,16(1):31~34(in Chinese) [8] 何勇灵,刘建新,赵致和,等.一种研究柴油机喷油系统中汽泡的新方法 . 内燃机学报,2000,18(3):254~257 He Yongling, Liu Jianxin, Zhao Zhihe, et al. A new method for study cavitation in fuel injection system of diesel engine[J] Transaction of Chinese Society for Internal Combustion Engine,2000, 18(3):254~257(in Chinese)

施引文献

资源附件(0)

访问统计