Quantifying the variability in stiffness and damping of an automotive vehicle's trim-structure mounts
Quantifying the variability in stiffness and damping of an automotive vehicle's trim-structure mounts
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量化汽车装饰结构支架的刚度和阻尼变化
DOI：
10.1088/1742-6596/744/1/012197
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Abolfathi A
中科院分区：
文献类型：
--
作者：
Abolfathi A
在机动车辆中大量使用小的塑料夹子来将内部装饰件连接到车辆结构。其特性的可变性可导致车辆的噪声和振动响应的总体可变性。由于其材料和制造公差，更重要的是由于边界条件，会出现可变性。为了测量它们的刚度和阻尼，使用一个简单的实验装置，其中一个质量由被建模为单自由度系统的夹子支撑。试验台的设计使其模拟了真实的车辆的边界条件。首先研究了夹持的变化以及由于结构侧的边界条件引起的变化，刚度为7%，阻尼为8%。为了模拟装饰侧的连接，使用3D打印机构建安装件。松动连接的夹子的响应中会出现卡嗒声，但是通过预加载安装件，有效刚度增加，卡嗒声被消除。由于在配平侧的边界条件的变化是高达40%的刚度和52%的阻尼。
Small plastic clips are used in large numbers in automotive vehicles to connect interior trims to vehicle structures. The variability in their properties can contribute to the overall variability in noise and vibration response of the vehicle. The variability arises due to their material and manufacturing tolerances and more importantly due to the boundary condition. To measure their stiffness and damping, a simple experimental rig is used where a mass is supported by the clip which is modelled as a single degree of freedom system. The rig is designed in a way that it simulates the boundary condition as those of the real vehicle. The variability in clip and also due to the boundary condition at the structure side is first examined which is 7% for stiffness and 8% for damping. To simulate the connection of the trim side, a mount is built using a 3D printer. Rattling occurs in the response of the clips with loose connections, however by preloading the mount the effective stiffness increases and the rattling is eliminated. The variability due to the boundary condition at the trim side was as large as 40% for stiffness and 52% for damping.
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