Quantifying the variability in stiffness and damping of an automotive vehicle's trim-structure mounts

Abolfathi, Ali; O'Boy, Daniel; Walsh, Stephen J.; Dowsett, Amy; Fisher, Stephen

doi:10.1088/1742-6596/744/1/012197

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…The mobility functions between point 1 on the first plate and point 2 on the second plate are obtained. The uncertainty in the clips properties are considered based on the measurement conducted in [8]. A Monte Carlo simulation is used to obtain the point and the transfer mobilities while the clips properties are varied.…”

Section: Mathematical Formulation Of the Problemmentioning

confidence: 99%

“…A new signal will be classified based on its to the class of healthy or faulty signals, according to Eq. (8).…”

Section: Classificationmentioning

confidence: 99%

“…The uncertainty in joint property are modelled using the measured variability of plastic mount that are used to connect the trim to the structure of an automotive vehicle [8]. A large number of these clips are used in modern vehicles.…”

Section: Introductionmentioning

confidence: 99%

“…These clips should be firmly connected and any rattling can be a source of unwanted noise in a vehicle's cabin. It is shown that the variability in the effective stiffness and damping of such clips can affect the vibration response of the vehicle [8]. Such variability makes the damage detection process more difficult and uncertain.…”

Section: Introductionmentioning

confidence: 99%

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Vibration-based damage detection of structural joints in presence of uncertainty

2018

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Abstract. Early damage detection of structure's joints is essential in order to ensure the integrity of structures. Vibration-based methods are the most popular way of diagnosing damage in machinery joints. Any technique that is used for such a purpose requires dealing with the variability inherent to the system due to manufacturing tolerances, environmental conditions or aging. The level of variability in vibrational response can be very high for mass-produced complex structures that possess a large number of components. In this study, a simple and efficient time frequency method is proposed for detection of damage in connecting joints. The method suggests using singular spectrum analysis for building a reference space from the signals measured on a healthy structure and then compares all other signals to that reference space in order to detect the presence of faults. A model of two plates connected by a series of mounts is used to examine the effectiveness of the method where the uncertainty in the mount properties is taken into account to model the variability in the built-up structure. The motivation behind the simplified model is to identify the faulty mounts in trim-structure joints of an automotive vehicle where a large number of simple plastic clips are used to connect the trims to the vehicle structure.

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Section: Mathematical Formulation Of the Problemmentioning

confidence: 99%

“…A new signal will be classified based on its to the class of healthy or faulty signals, according to Eq. (8).…”

Section: Classificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vibration-based damage detection of structural joints in presence of uncertainty

2018

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“…An experimental rig has been designed which resembles the boundary condition of the clip in the real working condition, allowing an evaluation of their effect on the uncertainty in clip's properties. The methodology and initial results have been previously presented in Abolfathi et al 21 The effect of uncertainty in the stiffness and damping of the clips on the variability of the dynamic response is assessed through a series of Monte Carlo simulations. The effect of uncertainty in damping alone and stiffness alone are also evaluated which confirms the conclusion of a previous study.…”

Section: Introductionmentioning

confidence: 99%

The uncertainty in stiffness and damping of an automotive vehicle’s trim-structure mounts and its effect on the variability of the vibration transfer function

Abolfathi

O'Boy

Walsh

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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A large number of plastic clips are used in an automotive vehicle to connect the trim to the structure. These are small clips with very small masses compared to the structural elements that they connect together; however, the uncertainty in their properties can affect the dynamic response. The uncertainty arises out of their material and manufacturing tolerances and more importantly the boundary conditions. A test rig has been developed that can model the mounting condition of the clips. This allows measurement of the range of their effective stiffness and damping. Initially, the boundary condition at the structure side is replicated. The variability is found to be 7% for stiffness and 8% for damping. In order to simulate the connection of the trim side, a mount is built using a 3D printer. The variability due to the boundary condition on both sides was as large as 40% for stiffness and 36% for damping. A Monte Carlo simulation is used in order to assess the effect of the uncertainty of the clips’ properties on the vibration transfer functions of a door assembly. A simplified connection model is used in this study where only the axial degree of freedom is considered in connecting the trim to the door structure. The uncertainty in the clip stiffness and damping results in a variability in the vibration transfer function which is frequency dependent and can be as high as 10% at the resonant peaks with higher values at some other frequencies. It is shown that the effect of the uncertainty in the clips effective damping is negligible and the variability in the dynamic response is mainly due to the uncertainty in the clip’s stiffness. Furthermore, it is shown that the variability would reduce either by increasing or decreasing the effective stiffness of the clips.

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A Study on Door Clips and Their Influence on BSR Performance

Mohammed

Raghavendran

Chaudhari

et al. 2019

SAE Technical Paper Series

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Quantifying the variability in stiffness and damping of an automotive vehicle's trim-structure mounts

Cited by 4 publications

References 6 publications

Vibration-based damage detection of structural joints in presence of uncertainty

Vibration-based damage detection of structural joints in presence of uncertainty

The uncertainty in stiffness and damping of an automotive vehicle’s trim-structure mounts and its effect on the variability of the vibration transfer function

A Study on Door Clips and Their Influence on BSR Performance

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