New method of indirectly measuring equivalent dynamic stiffness in multipoint-connecting packaging coupling interface

A technology of dynamic stiffness and a new method, applied in the field of dynamic stiffness testing, can solve the problems of difficulty in exciting and picking up vibration, and the accuracy cannot be guaranteed, so as to achieve the effect of convenient engineering application and avoid dependence.

Inactive Publication Date: 2015-02-04
JIANGNAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

At the same time, the existing methods generally have the problem that the accuracy cannot be guaranteed for the measurement of the dynamic stiffness of the complex packaging coupling interface

Method used

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  • New method of indirectly measuring equivalent dynamic stiffness in multipoint-connecting packaging coupling interface
  • New method of indirectly measuring equivalent dynamic stiffness in multipoint-connecting packaging coupling interface
  • New method of indirectly measuring equivalent dynamic stiffness in multipoint-connecting packaging coupling interface

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Example Embodiment

[0015] Example

[0016] The method for measuring the equivalent dynamic stiffness of the packaging coupling interface of the present invention comprises the following steps:

[0017] (1) Arrange the sensor on the product to measure the frequency response function of the component level of the product [H A ] c(a)i(a ), [H A ] c(a)c(a) ;

[0018] (2) Arrange sensors on the vehicle to measure the frequency response function of the component level of the vehicle [H B ] o(b)c(b) , [H B ] c(b)c(b) ;

[0019] (3) For products, vehicles are coupled and connected through packaging according to the actual logistics and transportation conditions, and acceleration sensors are arranged to directly measure the horizontal frequency response function of the system [H S ] o(b)i(a) ;

[0020] (4) Apply the following formula to calculate the dynamic stiffness of the packaging coupling interface

[0021] [ K c ] = ...

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Abstract

The invention discloses a high-precision method of indirectly measuring equivalent dynamic stiffness in a multipoint-connecting packaging coupling interface and belongs to the field of packaging. The high-precision method is mainly characterized in that the equivalent dynamic stiffness in the packaging interface is calculated according to a measured system level frequency-response function and a measured part level frequency-response function. The method includes following steps: (1) arranging a sensor and measuring the frequency-response functions: [HA]<c(a)i(a)>, [HA]<c(a)c(a)>, [HB]<o(b)c(b)> and [HB]<c(b)C(b)>, of a product and a vehicle; (2) performing packaging connection the product and the vehicle, arranging a sensor and measuring the system level frequency-response function [HS]<o(b)i(a)>; and (3) calculating the dynamic stiffness in the packaging coupling interface according to the measured system level frequency-response function and the measured part level frequency-response function. The method is free of shock excitation and vibration picking-up onto the packaging interface and the dynamic stiffness in the packaging interface is measured completely according to the measured frequency-response functions, so that the method is simple in engineering application and is high in precision.

Description

technical field [0001] The invention relates to the technical field of packaging coupling interface parameter identification, in particular to a testing method for the equivalent dynamic stiffness of the packaging coupling interface. Background technique [0002] The phenomenon of product damage in logistics is very serious, resulting in huge economic losses. Protective packaging can effectively reduce the logistics loss of products, and its design is based on the dynamic stiffness of the packaging interface. For the packaging coupling interface, it usually includes inner liner, outer packing box, pallet and other auxiliary fixing devices, etc., and their performance aggregates to form the dynamic stiffness of the complex packaging coupling interface. When the dynamic stiffness is large, the response of the packaged product may be amplified and cause product damage. When the dynamic stiffness is small, the deformation of the cushioning material will be very large, which req...

Claims

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Application Information

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IPC IPC(8): G01N19/00
Inventor 王军段芳卢立新
Owner JIANGNAN UNIV
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