Auto-body NVH performance design based on damping characteristics robustness#br#

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 139-145.

HAO Yaodong 1.2.3, PAN Nenggui1, HE Zhicheng1, GU Chengbo4

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Abstract

Damping sheet is one of main means to control vibration and noise of vehicles, the robustness of its loss factor and manufacturing thickness is one of main factors causing vehicles’ NVH performance fluctuation.Here, the damping sheet was studied to control vehicles’ NVH performance fluctuation.Firstly, a four-factor model for damping material was built, Marquardt method was used to solve the model’s parameters and obtain damping material loss factor’s uncertain distribution characteristics.Then, the modal strain energy method was adopted to determine laying location of damping sheet.Finally, taking thickness of damping sheet as the design variable and loss factor as the random variable, the combined optimization method of the genetic algorithm (GA) and the sequential quadratic programming (SQP) one was applied to do the robustness optimization design and reduce the fluctuation of vehicle interior noise under the condition of ensuring the sound pressure level inside vehicle.Taking a MPV model as an example, the optimization design was performed.The results showed that the mean value of the single objective function (SOF) is 0.465 and its standard deviation is 0.004 7; the reliability reaches 99.8%, it’s almost double the initial design value.

Key words

Damping sheet / Four factor model / Marquardt algorithm / Manufacturing robustness / Interior noise

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HAO Yaodong 1.2.3, PAN Nenggui1, HE Zhicheng1, GU Chengbo4. Auto-body NVH performance design based on damping characteristics robustness#br#[J]. Journal of Vibration and Shock, 2018, 37(19): 139-145

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