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浙江大学学报(工学版)
能源与环境工程     
自适应广义S变换汽油机怠速振动分析
刘瑞骏1 ,郝志勇1,郑旭1,苏航2,蒋洪峰2
1. 浙江大学 能源工程学院,浙江 杭州 310027; 2. 浙江吉利动力总成研究院,浙江 宁波 315336
Investigation of idling vibration characteristics of gasoline engine based on adaptive generalized S transform
LIU Rui jun1, HAO Zhi yong1, ZHENG Xu1, SU Hang2, JIANG Hong feng2
1. College of Energy Engineering, Zhejiang University, Hangzhou 310027, China;2. Zhejiang Geely Powertrain Research Institute, Ningbo 315336, China
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摘要:

为了获得某汽油机怠速时的振动特性,以便进行有针对性的NVH(振动、噪声、平顺性)改进优化,采用自适应广义S变换对发动机振动信号进行时频分析.与S变换结果的对比表明,自适应广义S变换具有更合适的时频分辨率.对某直列四缸汽油机进行怠速工况振动测试,并调整气门间隙及发动机热负荷.时频分布的对比表明,冷启动时主要振动源为配气机构及活塞敲击.冷机时,进、排气门落座激励频率分别为500~2 100 Hz及800~2 200 Hz,活塞敲击激励频率为400~6 000 Hz.当热负荷增大后,发动机整体振幅锐减,喷油器激励凸显,燃烧激励始终微弱.热机时,进排气门落座激励频率分别为2 200~5 800 Hz及3 800~6 000 Hz,活塞敲击激励频率为2 500~3 000 Hz以及4 500~5 000 Hz,喷油器激励频率为3 800~5 700 Hz.结果表明,不同热负荷状态下振动的频率特性区别较大,热机时低频成分减少.

Abstract:

 A time frequency analysis of the vibration signals was processed by adaptive generalized S transform (AGST) in order to obtain the idling vibration characteristics of a gasoline engine which will be helpful in the targeted NVH optimization. The AGST was proved to own more suitable time frequency resolution, compared with S transform. A vibration measurement was conducted at idling for a four cylinder inline gasoline engine and the valve clearances and the thermal load were adjusted during the experiment. Through the time frequency distribution, the valve mechanism and the piston slap were demonstrated as dominated vibration sources at cold start. At cold idling, the frequencies of these excitations are respectively in the range of 500~2 100 Hz (inlet valve seating), 800~2 200 Hz (exhaust valve seating) and 400~6 000 Hz (piston slap). The overall amplitude slashed and the fuel injector excitation appeared along with the increase of the thermal load while the combustion signal was faint throughout. At hot idling, excitation frequencies respectively change to 2 200~5 800 Hz (inlet valve seating), 3 800~6 000 Hz (exhaust valve seating), 2 500~3 000 Hz and 4 500~5 000 Hz (piston slap). The major variation of vibration characteristics in frequency domain mainly manifest as an obvious decrease in the low frequency band at higher thermal load.

出版日期: 2016-09-18
:  TK 417  
通讯作者: 郝志勇,男,教授,博士生导师. ORCID: 0000 0002 9907 8734.     E-mail: haozy@zju.edu.cn
作者简介: 刘瑞骏(1990-),男,博士生,从事汽车与发动机NVH控制研究. ORCID: 0000 0003 2496 2629. E-mail: beefman@zju.edu.cn
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引用本文:

刘瑞骏,郝志勇,郑旭,苏航,蒋洪峰. 自适应广义S变换汽油机怠速振动分析[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2016.03.009.

LIU Rui jun, HAO Zhi yong, ZHENG Xu, SU Hang, JIANG Hong feng. Investigation of idling vibration characteristics of gasoline engine based on adaptive generalized S transform. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2016.03.009.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2016.03.009        http://www.zjujournals.com/eng/CN/Y2016/V50/I3/460

[1] 胡国强,陈晓东,孙柏林,等. 4缸柴油机怠速噪声及声品质优化研究[J]. 内燃机工程, 2009(4): 7881.
HU Guo qiang, CHEN Xiao dong, SUN Bo lin, et al. Study and optimization on idle noise and sound quality of four cylinder diesel engine [J]. Chinese Internal Combustion Engine Engineering, 2009(4): 7881.
[2] WATANABE A, HOHKITA A, SOMA M, et al. Noise reduction in gasoline DI engines [R]. SAE International Paper, 2011.
[3] KIMURA J, IIMURA S, SHIGYO H. Experimental analysis of the stick slip noise from the crankshaft oil seal of the diesel engine [R]. SAE International Paper, 2007.
[4] MIURA Y, KOJIMA N. Noise generating mechanism at idling for a four cylinder in line diesel engine [R]. SAE International Paper, 2003.
[5] POLLACK M, GOVINDSWAMY K, HARTWIG M. Cold start engine clatter noise evaluations [R]. SAE International Paper, 2005.
[6] BADAWI B A, KHOLOSY M, OMER A A, et al. Identification of diesel engine events from acoustic signals using independent component analysis and time frequency analysis [R]. SAE International Paper, 2007.
[7] FABI P, FLEKIEWICZ M, MADEJ H, et al. Influence of piston slap on engine block vibration [R]. SAE International Paper, 2007.
[8] 金阳. 加高斯窗的STFT对内燃机振声信号的适用性相关研究[D]. 杭州: 浙江大学, 2011.
JIN Yang. Research pertaining to the applicability of gaussian function windowed STFT to internal combustion engine vibroacoustic signals [D]. Hangzhou: Zhejiang University, 2011.
[9] 郝志勇,韩军. 小波变换技术在内燃机振声信号分析中的应用[J]. 内燃机工程, 2003(6): 79.
HAO Zhi yong, HAN Jun. Application of wavelet analysis technology to vibration and acoustic signal processing in internal combustion engine [J]. Chinese Internal Combustion Engine Engineering, 2003(6): 79.
[10] LI B, ZHANG P L, LIANG S B, et al. Feature extraction for engine fault diagnosis utilizing the generalized S transform and non negative tensor factorization [J]. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2011, 225(8): 19361949.
[11] 郑旭. 车辆与内燃机振声信号盲分离及噪声源识别的研究[D]. 杭州: 浙江大学, 2012.
ZHENG Xu. Research on blind separation and noise source identification for the vibro acoustic signals of vehicle and engine [D]. Hangzhou: Zhejiang University, 2012.
[12] SEJDIC E, DJUROVIC I, JIANG J. A window width optimized S transform [J]. EURASIP Journal on Advances in Signal Processing, 2008,2008:59.
[13] DJUROVIC I, SEJDIC E, JIANG J. Frequency based window width optimization for S transform [J]. AEU   International Journal of Electronics and Communications, 2008, 62(4): 245250.
[14] STOCKWELL R G, MANSINHA L, LOWE R P. Localization of the complex spectrum: the S transform [J]. IEEE Transactions on Signal Processing, 1996, 44(4): 9981001.
[15] 景国玺. 活塞组多物理场耦合非线性问题及环组机油消耗改进设计研究[D]. 杭州: 浙江大学, 2011.
JING Guo xi. Research on multi physical coupling nonlinear problem and improved design of ring pack lubricating oil consumption [D]. Hangzhou: Zhejiang University. 2011.
[16] 郭磊,郝志勇,张鹏伟,等. 活塞动力学二阶运动的仿真方法与试验研究[J]. 内燃机工程, 2009(6): 4147.
GUO Lei, HAO Zhi yong, ZHANG Peng wei, et al. Simulation and experimental research on piston secondary motion [J]. Chinese Internal Combustion Engine Engineering, 2009(6): 4147.
[17] 刘建敏,史玉鹏,许世永,等. 基于缸盖振动的燃油喷射系统故障诊断[J]. 装甲兵工程学院学报, 2011(3): 2934.
LIU Jian min, SHI Yu peng, XU Shi yong, et al. Fuel injection system fault diagnosis based on cylinder head vibration signal [J]. Journal of Academy of Armored Force Engineering, 2011(3): 2934.
[18] 周龙保. 内燃机学[M]. 北京: 机械工业出版社, 2005:8889.
[19] 庞剑,湛刚,何华. 汽车噪声与振动—理论与应用[M]. 北京: 北京理工大学出版社, 2006:153156.

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