Abstract
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.
Highlights
The level of noise and vibration in automotive vehicles is a major concern for the luxury market where the level should be kept low to ensure the satisfaction of customers
Variability in noise and vibration is common in identical vehicles due to manufacturing tolerances and variations in material properties [1,2,3,4,5,6], which can result in vehicles with a Frequency Response Function (FRF) that exceeds the threshold set at the design stage
Test methodology The stiffness and damping of the clip can be estimated by measuring the dynamic response of a mass that is supported by the clip provided internal resonances are high enough to allow it to be represented as a Single Degree Of Freedom (SDOF) system
Summary
Quantifying the variability in stiffness and damping of an automotive vehicle's trim-structure mounts. This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 744 012197 (http://iopscience.iop.org/1742-6596/744/1/012197) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 128.41.61.25 This content was downloaded on 13/03/2017 at 17:03 Please note that terms and conditions apply. Fisher Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
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