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利用LMS设备对制动Moan噪音的排查
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作者 施展翔 周宗成 +2 位作者 李军 辛庆锋 刘泽毅 《时代汽车》 2024年第15期16-18,共3页
文章介绍了常见的制动噪音的类型,以及LMS系统在制动噪音排查上的应用。并通过介绍某一新能源车型开发过程中Moan噪音的解决,详细介绍LMS设备在制动噪音上的排查过程和导致噪音的原因,改善了车辆的制动NVH性能,提高了产品竞争力。
关键词 制动噪音 倒车异响 LMS设备 Moan噪音
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某电驱桥车型Moan噪声分析与优化控制 被引量:4
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作者 金文辉 邓欣 +1 位作者 段龙杨 钟秤平 《噪声与振动控制》 CSCD 北大核心 2021年第4期270-275,共6页
电驱桥系统作为新能源商用车型的主流动力系统直接驱动车轮行驶。由于没有悬置,驱动电机及减速器直接装配在驱动桥上,通过板簧和减震器与车身或车架连接。没有传统发动机噪声的掩蔽,电驱桥NVH问题对NVH工程师挑战极大。针对某电驱桥商... 电驱桥系统作为新能源商用车型的主流动力系统直接驱动车轮行驶。由于没有悬置,驱动电机及减速器直接装配在驱动桥上,通过板簧和减震器与车身或车架连接。没有传统发动机噪声的掩蔽,电驱桥NVH问题对NVH工程师挑战极大。针对某电驱桥商用客车中高车速工况下车内存在的明显Moan问题,运用“源-路径-响应”理论进行分析。结合实验和仿真方法进行排查分析,锁定主要原因为电驱桥一轴的动不平衡激励偏大。通过改变减速器速比,降低同一车速下对应的电驱桥一轴转速,从而可降低该车型高速Moan噪声。 展开更多
关键词 声学 电驱桥 减速器 高速 Moan 动不平衡
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不均匀拖滞力矩引起的汽车Moan噪声 被引量:1
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作者 何晓引 刘相斌 张红燕 《汽车工业研究》 2018年第11期48-51,共4页
对汽车在潮湿环境工况下低速行驶产生的Moan噪音进行测量分析。研究汽车摩擦片与制动盘之间的拖滞力矩和后轴系统的固有频率对产生Moan噪音的影响。研究结果表明,汽车低速行驶时,摩擦片与制动盘之间的不均匀拖滞力矩产生的激励使后轴系... 对汽车在潮湿环境工况下低速行驶产生的Moan噪音进行测量分析。研究汽车摩擦片与制动盘之间的拖滞力矩和后轴系统的固有频率对产生Moan噪音的影响。研究结果表明,汽车低速行驶时,摩擦片与制动盘之间的不均匀拖滞力矩产生的激励使后轴系统相关零部件模态耦合是引起Moan噪音的根本原因。本文对故障车辆进行了实车测量和分析,为消除汽车低速行驶工况Moan噪音问题提供了理论依据。 展开更多
关键词 低速行驶 拖滞力矩 Moan噪音
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Characteristics of low-frequency oscillations in course of SCS summer monsoon onset
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作者 毛江玉 谢安 +1 位作者 宋焱云 叶谦 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2000年第3期65-72,共8页
Some of the low-frequency oscillation (LFO) characteristics of summer moan onset over the South China Sea (SCS) are examined based on NCEP/NCAR reanalysis data and OLR from NOAA in the period of 1979-1996. It is found... Some of the low-frequency oscillation (LFO) characteristics of summer moan onset over the South China Sea (SCS) are examined based on NCEP/NCAR reanalysis data and OLR from NOAA in the period of 1979-1996. It is found that the SCS summer monsoon is characterized by predominance of low-frequency activities with significant interannual variability closely related with onset time. The LFOs over the SCS strengthen after onset. Composite analyses for LFO components of OLR and kinetic energy indicate that the eastward propagation of LFO over the equatorial Indian Ocean and LFO coming from the western Pacific strongly affect the physical processes responsible for the SCS summer monsoon onset. The SCS is the place where the Indian Ocean LFO links with low-frequency activities over the western pacific during summer monsoon onset. 展开更多
关键词 Low -frequency oscillation the South China Sea summer moan onset
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Promoting Metro Operation Safety by Exploring Metro Operation Accident Network
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作者 Qi SUO Liyuan WANG +1 位作者 Tianzi YAO Zihao WANG 《Journal of Systems Science and Information》 CSCD 2021年第4期455-468,共14页
Understanding the causation of accidents is essential to promote metro operation safety.In terms of 243 reported metro operation accident cases in China, a directed weighted network was constructed based on complex ne... Understanding the causation of accidents is essential to promote metro operation safety.In terms of 243 reported metro operation accident cases in China, a directed weighted network was constructed based on complex network theory, where nodes and directed edges denotes factors and event chains respectively. To reveal the key causal factors, the topological characteristics of metro operation accident network(MOAN) were analyzed from both global and local views. The results show that facility-type factors are more closely related to the occurrence of the accidents from the perspectives of average path length and cascading effects. Accident types like train delay and train suspension are the great risk recipients. Key causal factors with large out-degree, out-strength, betweenness centrality and cluster coefficient, such as communication and signal failure, vehicle failure and piling into the train should be noticed. The research framework proposed in the paper is not only applicable to China’s metro operation system, but also appropriate for other transportation system safety studies. 展开更多
关键词 operation accident analysis directed weighted network metro operation accident network(MOAN) complex network
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