Investigating the sources of variability in the dynamic response of built-up structures through a linear analytical model

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

doi:10.1016/j.jsv.2016.10.007

Cited by 5 publications

(9 citation statements)

References 19 publications

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“…The effect of the uncertainty in the damping and the stiffness of the mount on the dynamic response is not the same. 18 To distinguish their separate effects, the Monte Carlo simulation is repeated whilst the uncertainty only in stiffness is considered and the damping ratio kept constant. The uncertainty in the damping is then investigated whilst the average stiffness is used as the constant stiffness value of the mount.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, it is possible to make the vibration transfer function less sensitive to variation in the properties of the mount by increasing or decreasing the mount stiffness to move it out of this sensitive range of stiffness values. For more detail on the effect of mount stiffness on the variability of vibration transfer functions, an interested reader can refer to Abolfathi et al 18…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it is shown in Abolfathi et al. 18 that there is a specific range of the mount’s stiffness for which the vibration transfer function between connected structures is sensitive to the properties of the mount. This stiffness range is a function of frequency and the flexibility of the connecting structures.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of uncertainty in damping alone and stiffness alone are also evaluated which confirms the conclusion of a previous study. 18 It is also shown that varying the mean value of the clip's stiffness can change the variability in the vibration transfer function.…”

Section: Introductionmentioning

confidence: 99%

“…All the components of a built-up structure can contribute to the overall variability in its dynamic response although their contribution would not be the same in terms of modifying the amplitude and location of natural frequencies. 18 As an example, the interior trim panels of an automotive vehicle can be attached to the vehicle body using small plastic clips. Ideally, the stiffness and loss factor of these clips would be highly consistent, however this can often contradict with the need for high volume manufacturing or speed/ease of assembly.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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