Acceleration spectrum analysis for transport packaging under random vibration

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (16) : 37-46.

YANG Songping1,2,3，WANG Zhiwei1,2,3

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Abstract

It has not been systematically studied on the theory for acceleration response spectrum of tangential transport packaging system under random vibration, but acceleration response is a key index to evaluate the effectiveness of product packaging, in addition, a large proportion of packaging materials conform to tangent type of force-displacement relationships within a certain deformation range. So the transport package considering critical component under random vibration was modeled as two degrees of freedom tangential packaging system, and the approximate solution method of the acceleration response spectrum was established. Meanwhile, the application scope of the proposed method was pointed out. The numerical simulation was carried out to validate the method, on this basis, the sensitivity of the acceleration response spectrum to external excitation intensity and system parameters was explored further, and the nonlinear effect of tangential hard spring was also analyzed. Due to the effect of the “hard spring” of tangent system stiffness, the frequency at the first-order resonance peak point of the product body and the first-order and second-order resonance peak points of the critical component acceleration responses were increasing to the right. There exists an optimal nonlinear characteristic parameter β^*, which can minimize the first-order response peak or the overall response energy of the critical component. System damping ratio, frequency ratio, critical component and product quality ratio play a very obvious “multiple order frequency modulation to adjust bandwidth” role on the response. The proposed method can not only effectively predict the response of product body and critical part, but also provide a theoretical basis for the packaging optimal design.

Key words

transport packaging / random vibration / critical component / acceleration response / power spectral density

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YANG Songping1,2,3，WANG Zhiwei1,2,3. Acceleration spectrum analysis for transport packaging under random vibration[J]. Journal of Vibration and Shock, 2023, 42(16): 37-46

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