共查询到20条相似文献,搜索用时 203 毫秒
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文章以某纵置四驱SUV低速加速1400rpm和1700rpm车内存在明显轰鸣声为例,通过传动系统转速波动测试、CAE模态和传递函数分析结合整车模态匹配表快速确定了1400rpm轰鸣声是由后副车架45Hz刚体模态被激发出来与车内声腔模态耦合形成,1700rpm轰鸣是发动机2阶激励将顶棚前横梁二阶模态53Hz激发出来与车内49Hz声腔模态耦合产生。通过在后副车架增加45Hz动力吸振器和前顶棚横梁加3.0kg质量块使1400rpm、1700轰鸣分别降低4.2dB(A)、6.8dB(A)。同时探讨了通过对TCU换挡策略进行标定能快速有效降低轰鸣6.2dB(A),为解决整车低转速轰鸣提供了一种新颖的指导思路。 相似文献
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论述动力吸振器设计开发原理,并从整车开发工程实践的角度出发,对传动轴的噪声-振动-平顺性(NVH)进行动力吸振器的设计。通过运用Head软件中的模态测试模块来确定噪声出现的频率,针对实际噪声工况设计吸振器的参数,并利用仿真和实车道路测试相结合的方法对吸振器效果进行验证。经验证该吸振器的设计解决了NVH 问题,改善了整车的驾乘舒适性。该方法可推广应用到整车其他零件的减振开发设计中去,对整车声学开发有积极的指导意义。 相似文献
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某SUV工装样车3 GWOT(3 Gear Wide Open Throttle,3挡全油门加速)工况下发动机转速在3 450 r/min左右时驾驶员内耳位置存在明显轰鸣噪声,试验测试结果显示发动机加速噪声声压级曲线在该频率下存在峰值,且2阶噪声起主导作用。通过NTF(NoiseTransferFunction,噪声传递函数)仿真分析发现了轰鸣噪声传递的主要路径,通过动刚度分析和模态分析确定动力总成激励激起副车架模态是轰鸣问题产生的主要原因。对副车架进行改进,提高了副车架1阶弯曲模态频率,同时提高扭力臂悬置安装点的动刚度水平,改善了噪声传递函数并解决加速轰鸣问题。改进后试验测试结果显示发动机加速噪声声压级曲线峰值在该频率下降低,主观感受加速轰鸣噪声基本消失,验证了仿真分析的准确性和改进方案的有效性。 相似文献
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针对某试验车后排右侧乘员处低频轰鸣声的特性及传递路径灵敏度进行了分析,确定发动机的2阶振动是该低频轰鸣声的主要贡献,是通过发动机的后悬置点传递到车身而引起的。提出了安装动力吸振器来减小发动机后悬置点处对振动传递的方法,并通过锤击试验和整车道路模拟试验表明,在该车前副车架后悬置点处安装动力吸振器,能够有效抑制其发动机转速为2 040 r/min时后排产生的低频轰鸣声。 相似文献
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传动系统扭振引起的车内低频轰鸣声,一直是汽车NVH领域的难点和热点问题。针对某型三缸机中型多用途汽车的中油门加速,在1400-2000r/min发动机转速时的车内低频轰鸣声问题,基于半消声室转鼓试验研究,运用相关性分析方法,锁定了传动系扭振为该问题的激励源,并通过传递路径分析,识别了前风挡玻璃与一阶空腔模态的受迫/耦合共振,是导致车内空气压力脉动升高并产生低频轰鸣声的主要原因。通过车身传递路径的优化,降低了车内低频轰鸣声2-4dB(A),显著提升了加速工况的车内声品质,为车内低频轰鸣声问题的优化提供了指导。 相似文献
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XMQ6116客车车速稳定在40~45km/h时整个车身出现有规律的、大位移的振动。经测试发现,该振动是上下方向的、频率3~4Hz,接近人体上下方向的共振频率,驾驶员和乘客反应强烈。通过计算得知,共振时轮胎的激励频率与共振频率吻合,证明激励来自路面,改变轮胎的半径可以调节共振的车速;减小悬架刚度可以减小车身上下振动的刚体模态。 相似文献
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K. H. Lee J. H. Bak J. -L. Park C. -H. Lee 《International Journal of Automotive Technology》2017,18(2):255-261
The objective of this study is to develop a damper that can reduce the amplitude of vibration in various frequency ranges. Previous H/Shaft vibration reduction methods work in a passive way. A dynamic damper reduces the amplitude of vibration at its first mode, but vibration still appears at the second mode. A mass damper or hollow shaft can shift the natural frequency to a lower or higher region. The fixed operating frequency prevents vibration from being reduced outside the operating frequency range. The proposed damper uses electromagnets as either masses or actuators to change the damper mode between dynamic damper mode and mass damper mode. The electromagnetic damper (EMD) can change its mode to respond to the vibration excitation at both low and high frequencies. The vibration reduction performance was evaluated by FRF tests in laboratory and vehicle conditions. The results were compared with those of a dynamic damper and indicate that the amplitude of vibration is reduced by 95.6 % when the EMD is implemented on an H/Shaft, whereas only 61.9 % vibration reduction is achieved by the dynamic damper. 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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行星减速器为车辆传动系统提供期望传动比的同时,对车辆振动舒适性也会产生特定的影响。本文针对某搭载行星减速器的纯电动客车进行实车振动试验,综合应用计权均方根加速度评价、频谱分析、常相干分析和阶次分析的方法,探讨整车振动特性;与中央直驱式纯电动客车进行对比分析,评价行星减速器对纯电动客车振动舒适性的影响。结果表明,纯电动客车搭载行星减速器改善了驱动电机工作状态,从而显著提高了车内后部振动舒适性;行星减速器太阳轮偏心导致车内中部振动信号中出现以行星架转频为调制频率的调制边带,一定程度上影响了车内中部振动舒适性。 相似文献
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