共查询到20条相似文献,搜索用时 218 毫秒
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针对某轻型载货汽车转向盘异常振动问题,结合轮毂与制动鼓总成动平衡试验进行了分析研究,发现轮毂与制动鼓总成不平衡量超出技术要求是导致样车转向盘异常振动的主要影响因素。通过控制轮毂与制动鼓不平衡量,使样车的转向盘异常振动现象得到了有效控制。总结了解决此类转向盘异常振动问题的步骤,规范了类似转向盘异常振动问题的处理方法。 相似文献
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某纯电动样车在试验过程中被抱怨驱动电机噪声问题。针对该问题,首先进行永磁同步驱动电机的振动噪音机理分析,建立以转速为输入信号和以噪声频率与阶次为输出信号的电机振动噪声理论模型,并推导出A声级噪声理论谱线;其次,进行被测永磁同步的电机振动噪声测试,得出A声级噪声试验谱线;最后,对比理论模型预测和测试结果,验证了模型的正确性,并识别被测永磁同步电机异常噪声源。该模型与试验相结合可以快速识别永磁同步电机的异常振动噪声源。 相似文献
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文章对引起汽车异常振动的原因进行了研究,将引起汽车振动的原因归为与转速或与车速相关两类,总结出汽车异常振动测试与分析流程。以某型汽车行驶时产生的异常振动问题为例开展道路试验,结合模态试验和车轮偏频试验,确定试验车辆的异常振动是由于车轮的转动频率与车轮总成偏频同频导致,同时车架进一步放大了振动。针对引起该车辆异常振动的原因提出改进意见,减弱了车辆的异常振动。 相似文献
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针对某车辆在行驶试验时,在车速57 km/h时出现低频5.4 Hz的驾驶室异常振动的现象,振动形式为俯仰振动,人体乘坐舒适性主观感觉很差。先后采用多种常规振动分析试验方法对该车进行振动分析,也未能分析出引起驾驶室异常振动的原因。最后对该车的车架和驾驶室进行模态试验分析,分析判断得出该车在行驶时驾驶室异常振动的频率与车架整体一阶弯曲时的接近,由此判断该车驾驶室异常振动是由车架整体-阶弯曲引起的。根据试验分析结果,文章最后对某车问题的改进方案综合评价后提出了合理的改进方案。 相似文献
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轮胎均匀性对牵引车行驶平顺性影响试验研究 总被引:1,自引:0,他引:1
针对某重型卡车行驶至70 km/h附近时存在严重异常振动现象,本文阐述了轮胎均匀性各项指标及影响因素,并通过道路试验的方法,得到了车辆在装配不同均匀性等级轮胎状态下,各车速驾驶室地板位置的加权加速度均方根值,结果表明,轮胎均匀性对汽车行驶平顺性的影响较为明显。本文为汽车整车及轮胎的匹配设计提供了依据,也为解决卡车异常振动问题提供了方向。 相似文献
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S. J. Kim S. G. Kim K. S. Oh S. K. Lee 《International Journal of Automotive Technology》2008,9(6):703-711
The excitation force of a powertrain is one of major sources of interior noise in a vehicle. This paper presents a novel approach
to predict the interior noise caused by the vibration of the powertrain by using the hybrid TPA (transfer path analysis) method.
Although the traditional transfer path analysis (TPA) is useful for the identification of powertrain noise sources, it is
difficult to modify the structure of a powertrain by using experiments for the reduction of vibration and noise. In order
to solve this problem, the vibration of the powertrain in a vehicle is numerically analyzed by using the finite element method
(FEM). The vibration of the other parts of the vehicle is investigated by using experiments based on vibrato-acoustic transfer
function (VATF) analysis. These two methods are combined for the prediction of interior noise caused by a powertrain. Throughout
this research, two papers are presented. This paper presents a simulation of the excitation force of the powertrain exciting
the vehicle body based on numerical simulation. The other paper presents a prediction of interior noise based on the hybrid
TPA, which uses the VATF of the car body and the excitation force predicted in this paper. 相似文献
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行驶车辆振动信号的小波分析 总被引:10,自引:0,他引:10
本文介绍了小波分析的理论方法,并上小波分析方法应用到了行驶车辆振动的分析中,即:通过二进离散小波变换,把实际振动信号进行多层小波分解,使异常信号和非平稳高频信号得到良好的时间定位和图形显示,并把信号的路面激励与本体振动分离开来。 相似文献
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用ERA法建立计及传动系扭振的整车振动模型 总被引:1,自引:0,他引:1
运用动态子结构综合原理建立了整车振动方程,用特征系统实现(ERA)算法辨识子结构与动力学参数,从而建立了计及车体弹性,发动机支承刚度和传动系扭振的整车振动分析模型。利用该模型可更全面,真实地分析,预测和控制整车的异常振动。分析表明,计及传动系扭振与否,对整车频率及振动特性有明显影响。 相似文献
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Orang Vahid Amir Khajepour Fathy Ismail 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2007,45(12):1131-1147
In this paper, an in situ method has been used to find the optimum set of body mounts for a given vehicle. The strength of this method is that it does not require the vehicle to be disassembled. Standard noise, vibration and harshness testing procedures are used to obtain frequency response function (FRF) models of the vehicle's subsystems. This is followed by FRF-based substructuring synthesis approach to obtain the overall vehicle model. The model is incorporated into an optimization algorithm to predict the optimum set of body mounts for a desired objective function. The in situ method is presented and applied to an experimental case study of a pick up truck. The experimental results confirmed the validity and effectiveness of this approach in finding the optimum body mount set, resulting in significant reduction in the vibration level of the vehicle. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1131-1147
In this paper, an in situ method has been used to find the optimum set of body mounts for a given vehicle. The strength of this method is that it does not require the vehicle to be disassembled. Standard noise, vibration and harshness testing procedures are used to obtain frequency response function (FRF) models of the vehicle's subsystems. This is followed by FRF-based substructuring synthesis approach to obtain the overall vehicle model. The model is incorporated into an optimization algorithm to predict the optimum set of body mounts for a desired objective function. The in situ method is presented and applied to an experimental case study of a pick up truck. The experimental results confirmed the validity and effectiveness of this approach in finding the optimum body mount set, resulting in significant reduction in the vibration level of the vehicle. 相似文献