摘要
非道路高压共轨柴油机工作条件恶劣,对振动噪声性能提出较高要求。应用多体动力学方法,建立非道路高压共轨柴油机活塞组动力学模型、阀系动力学模型以及整机多体动力学分析模型,通过对机体与曲轴模态测试,验证缩减模型的准确性。对活塞组和阀系动力学特性、主轴承载荷以及整机振动与噪声特性进行分析,结果表明,在倾覆力矩作用下,2阶谐次及其整数倍谐次下发动机振动较大;2阶谐次下,机体次推力侧振动比主推力侧振动剧烈;油底壳表面辐射声功率级最大,最大值为109.1 d B;在523 Hz频率下声压级最大,最大值为85.23 d B。研究结果可为整机减振降噪提供优化方向。
Due to the poor working conditions for non-road diesel engines, harsh requests for engine vibration and noise performance is necessary. In this paper, the dynamic model of the engine piston set, the dynamic model of the valve system and the multi-body dynamic model of the whole machine of the non-road high pressure co-rail diesel engine are established respectively by applying multi-body dynamics method. The accuracy of the models is verified by the modal tests of the engine body and the crankshaft. The dynamic characteristics of the piston set and the valve system, the main bearing loads and the vibration and noise characteristics of the whole machine are analyzed. The results show that under the action of the overturning moment of the four-cylinder engine, the second order harmonic and its multiple harmonic can lead to violent vibration of the engine. The vibration on the secondary thrust side is more intensive than that on the main thrust side at second order harmonic. The maximum sound power level 109.1 d B appears on the surface of the oil pan. The maximum of the overall sound pressure level is 85.23 d B at 523 Hz frequency. The results may provide an optimization direction for vibration and noise reduction of diesel engines.
作者
张磊
毕玉华
向熔
张宁
宋国富
申立中
ZHANG Le;BI Yuhua;XIANG Rong;ZHANG Ning;SONG Guofu;SHEN Lizhong(Yunnan Key Laboratory of ICE,Kunming University of Science and Technology,Kunming 650500,China;Kunming Yunnei Power Co.Ltd.,Kunming 650500,China)
出处
《噪声与振动控制》
CSCD
2018年第3期215-220,228,共7页
Noise and Vibration Control
基金
云南省科技创新强省计划资助项目(2015AA024)
关键词
振动与波
柴油机
多体动力学
模态试验
vibration and wave
diesel engine
multi-body dynamics
modal test
