共查询到20条相似文献,搜索用时 196 毫秒
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NVH性能是影响车辆舒适性的重要因素之一,某SUV车型加速过程中在发动机转速为2600 r/min时存在明显轰鸣声,严重影响车内乘员舒适性。通过道路上车内噪声的测试与分析、模态分析、CAE分析等方法对轰鸣声产生的原因进行了研究,确定该轰鸣声是由车身风挡横梁下板的局部结构振动和空腔声学模态耦合引起的。通过提高车身风挡横梁下板局部刚度改变结构振动的固有频率,避免了风挡横梁下板振动与声腔模态耦合。对风挡横梁下板进行局部改进后,道路试验结果表明车内轰鸣声得到明显改善,噪声降低5d B(A)左右。 相似文献
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以某型客车白车身的试验模型和车门车窗的有限元模型求取结构模态信息,获取结构20~200 Hz的振动速度特性后,建立车内空腔的边界元模型.在LMS Virtual.Lab中计算声学传递向量特性,从而进行车身板件声学贡献分析,得出各板件对车内场点总声压的贡献度,并找出对车内某点声学贡献大的板件.通过实施改进措施,改善了该车车内噪声水平. 相似文献
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在应用声传递向量技术对某商用客车的车内噪声进行板件声学贡献分析的基础上,提出了引入特征频率计权系数和场点权重系数确定多特征频率下对车内综合声场声学贡献量最大的关键车身板件的方法。接着采用中心组合设计通过最小二乘拟合建立了以关键板件振速和1阶模态频率为目标,板件与阻尼层厚度为变量的非线性的响应面模型,通过优化确定了变量的最佳组合。优化方案的实车试验结果显示车内噪声改善效果明显。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):975-990
The vibration characteristics of the door panels are affected by the weatherstrip seals used in between the doors and vehicle body along the perimeter of the doors. The weatherstrip seals exhibit nonlinear and viscoelastic material properties that vary with frequency, temperature, strain rate and amplitude, and previous load history. The material properties of the seal must be investigated carefully in order to predict the vibration characteristics of the automobiles under different loading conditions. In this study, we developed hyperelastic and viscoelastic models of the weatherstrip seal to predict dynamic performance of a vehicle door and its effect on the overall vehicle dynamics. For this purpose, first, static compression and stress relaxation experiments were performed on the seal using a robotic indenter equipped with force and displacement sensors and then a finite element model utilising the results of these experiments was developed in ANSYS. Finally, a representative model of the seal was integrated into the finite element model of the vehicle door to investigate its effect on the vehicle vibrations. The model predictions were validated using experimental modal analysis performed on the vehicle door with and without the seal. It was observed that the seal has a significant effect on the vehicle dynamics. 相似文献
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在汽车结构设计中,为了避免弹性体产生共振问题,需要适当提高低阶固有频率,做好频率分布规划。白车身系统可以看成是一个多自由度的振动系统,模态分析可以帮助我们了解结构自身的基本振动特性。本文以某重型卡车白车身为研究对象,利用有限元软件Radioss进行模态计算,然后与基于LMS Test.Lab的模态试验结果进行对比,验证有限元仿真计算的精确性,对白车身的设计具有重要的指导意义。 相似文献
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