CN104330235A - Novel method for determining equivalent dynamic stiffness of multi-point connection package coupling interface - Google Patents
Novel method for determining equivalent dynamic stiffness of multi-point connection package coupling interface Download PDFInfo
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- CN104330235A CN104330235A CN201410498656.0A CN201410498656A CN104330235A CN 104330235 A CN104330235 A CN 104330235A CN 201410498656 A CN201410498656 A CN 201410498656A CN 104330235 A CN104330235 A CN 104330235A
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- dynamic stiffness
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- frequency response
- response function
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Abstract
The invention discloses a novel method for determining equivalent dynamic stiffness of a multi-point connection package coupling interface, and belongs to the field of packaging. The method is mainly characterized in that the equivalent dynamic stiffness of the package interface is calculated according to a measured system horizontal frequency response function. The method comprises the following steps: 1, carrying out package connection on a product and a vehicle, and arranging an acceleration transducer at a coupling position; 2, arranging a sensor for an assembled product transport system, and measuring system horizontal transfer functions [HS]c(a)c(a), [HS]c(a)c(b) and[HS]c(b)c(b); and 3, according to the measured system horizontal frequency response function, directly calculating the dynamic stiffness of the multi-point connection package coupling interface. According to the invention, the dynamic stiffness of the package coupling interface is predicted completely according to the measured system horizontal frequency response function, and the method has the advantages of simple engineering application, high precision and the like.
Description
Technical field
The present invention relates to packaging coupled interface parameter recognition technology field, especially relate to the method for testing of packaging coupled interface equivalence dynamic stiffness.
Background technology
To there is damaged phenomenon in product very serious in logistics, and the economic loss caused thus is huge.Protective packaging effectively can reduce the logistics loss of product, and the basis of its design is the dynamic stiffness according to wrapper interface.For packaging coupled interface, normally comprise inner liner, extranal packing box, pallet and other auxiliary stationary installations etc., their performance lump row has become the dynamic stiffness of complicated packaging coupled interface.When dynamic stiffness is larger, the response of packaged product may be amplified and cause product breakage, and when dynamic stiffness is less, the distortion of padded coaming can be very large, thus require that the volume of packing container increases, and causes excessive packaging thus.Therefore, can say, the core of protective packaging design determines suitable packaging coupled interface dynamic stiffness.In the method for testing (comprising time domain approach, frequency domain method etc.) of all multiple solutions dynamic stiffness that mechanical vibration technical field of measurement and test grows up, need high-precision instrument and equipment, need a large amount of measuring points, simultaneously also very high to the requirement of experimental technique itself.Meanwhile, the problem that existing method cannot ensure for the test ubiquity precision comprising the complexity packaging coupled interface dynamic stiffness of multiple unit addressed above, particularly due to the restriction of the physical space of packaging coupled interface own, is difficult to exciting and pick-up.
Summary of the invention
The object of the present invention is to provide a kind of measuring accuracy high, without the need to the method for the easy measurement Mulit-point Connection packaging coupled interface dynamic stiffness of special measurement instrument, engineer applied.
The invention provides the method for testing for packing coupled interface dynamic stiffness, it is characterized in that: the system level frequency response function prediction packaging coupled interface dynamic stiffness adopting measurement completely, comprises the steps:
(1) to product (A), vehicle (B), according to actual logistics transportation actual condition, carries out multiple spot by packaging and is of coupled connections, and arranges acceleration transducer in coupling place;
(2) to the Product transport system assembled, placement sensor, the transport function [H of measuring system level
s]
c (a) c (a), [H
s]
c (a) c (b), [H
s]
c (b) c (b).Wherein [H
s]
ijrepresent and firmly into shape exciting is hammered at j point to product vehicle coupled system, in the acceleration transducer pick-up of i point, the frequency response function obtained, such as, [H
s]
c (a) c (a)encourage and acceleration measurement response at product and packaging coupling place, then gather time-domain signal and the acceleration transducer response signal of excitation, and then the initial point admittance of the product obtained and packaging coupling place, other are roughly the same.
(3) according to the system level frequency response function recorded, the dynamic stiffness of packaging coupled interface is directly calculated.Computing formula is as follows:
Wherein, ω=2 π f, represents sample frequency, T representing matrix sign of operation.
The present invention compared with prior art, has remarkable advantage:
(1) adopt the system level frequency response function prediction Mulit-point Connection packaging coupled interface equivalence dynamic stiffness of measurement completely, be particularly suitable for the identification of the dynamic stiffness that can not be split Product transport system packaging coupled interface.
(2) calculate the system level frequency response function required for formula of dynamic stiffness to be obtained by experiment test completely, avoid FEM (finite element) calculation or theoretical modeling to the dependence of model accuracy.
Accompanying drawing explanation
Fig. 1 Product transport system standard check point schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
The method that the present invention measures packaging coupled interface equivalence dynamic stiffness comprises the following steps:
(1) to product, vehicle, according to actual logistics transportation actual condition, carries out multiple spot by packaging and is of coupled connections, and arranges acceleration transducer in coupling place;
(2) encourage and acceleration measurement response at product and packaging coupling place, then gather time-domain signal and the acceleration transducer response signal of excitation, and then the initial point admittance [H of the product obtained and packaging coupling place
s]
c (a) c (a);
(3) encourage and acceleration measurement response at vehicle and packaging coupling place, then gather time-domain signal and the acceleration transducer response signal of excitation, and then the initial point admittance [H of the vehicle obtained and packaging coupling place
s]
c (b) c (b);
(4) in vehicle and packaging coupling place excitation, simultaneously in product and the response of packaging coupling place acceleration measurement, then gather time-domain signal and the acceleration transducer response signal of excitation, and then obtain acceleration admittance [H
s]
c (a) c (b);
(5) apply following formula to calculate packaging coupled interface dynamic stiffness
Above-mentioned (2), (3), (4) measurement of step medium frequency response function can be obtained by simple ripe " exciting test ", complete by " power hammer-accelerometer-multi-channel signal acquiring analytic system " hardware testing system, this system is public physical construction kinetic test analytic system, mainly comprise the power hammer of exciting, one group of sensor-accelerometer of vibratory response test, and multi-channel signal acquiring analytic system, as domestic DASP intelligent signal energy acquisition processing system, 16 or 32 passages, external as LMS, the systems such as BK, multi-channel signal acquiring analyser is primarily of advance signal regulator, (time-frequency Dynamic Signal reads for analog to digital converter and software kit, analyze, display, export, the functions etc. such as printing).
Above-described embodiment is the embodiment that the present invention recommends; but embodiments of the present invention are not restricted to the described embodiments; the amendment made under other any does not deviate from core essence of the present invention and principle, substitute, combination, simplify the substitute mode that all should be equivalence, be included within protection scope of the present invention.
Claims (4)
1. measure a new method for Mulit-point Connection packaging coupled interface equivalence dynamic stiffness, it is characterized in that, comprise the steps:
(1) to product, vehicle, according to actual logistics transportation actual condition, carries out multiple spot by packaging and is of coupled connections, and arranges acceleration transducer in coupling place;
(2) direct measuring system horizontal frequency response function;
(3) packaging coupled interface equivalence dynamic stiffness [K is directly calculated according to the system level frequency response function measured
c].
2. a kind of new method measuring Mulit-point Connection packaging coupled interface equivalence dynamic stiffness according to claim 1, it is characterized in that, the system level frequency response function of described measurement comprises [H
s]
c (a) c (a), [H
s]
c (a) c (b), [H
s]
c (b) c (b).Wherein [H
s]
ijrepresent and firmly into shape exciting is hammered at j point to product vehicle coupled system, in the acceleration transducer pick-up of i point, the frequency response function obtained, such as, [H
s]
c (a) c (a)encourage and acceleration measurement response at product and packaging coupling place, then gather time-domain signal and the acceleration transducer response signal of excitation, and then the initial point admittance of the product obtained and packaging coupling place, other are roughly the same.
3. a kind of new method measuring Mulit-point Connection packaging coupled interface equivalence dynamic stiffness according to claim 2, it is characterized in that, the system level frequency response function of required measurement directly adopts the acceleration admittance of measurement to express.
4. a kind of new method measuring Mulit-point Connection packaging coupled interface equivalence dynamic stiffness according to claim 3, it is characterized in that, the computing formula of dynamic stiffness is
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| CN201410498656.0A CN104330235A (en) | 2014-09-24 | 2014-09-24 | Novel method for determining equivalent dynamic stiffness of multi-point connection package coupling interface |
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Citations (6)
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| JP2013140067A (en) * | 2012-01-04 | 2013-07-18 | Ihi Corp | Excitation device |
| CN103308270A (en) * | 2013-06-04 | 2013-09-18 | 江苏万工科技集团有限公司 | Measuring method and device thereof for dynamic characteristics of negative open system |
| CN103308265A (en) * | 2013-06-14 | 2013-09-18 | 江苏万工科技集团有限公司 | Device and method for measuring dynamic stiffness frequency-dependent characteristics of return springs |
| CN103528775A (en) * | 2012-07-06 | 2014-01-22 | 中山大学深圳研究院 | Structural health detection method based on response sensitivity |
| CN104008259A (en) * | 2014-06-19 | 2014-08-27 | 东南大学 | Fruit transport package dynamic response analyzing method based on virtual vibration table |
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2014
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Patent Citations (6)
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|---|---|---|---|---|
| US20070245828A1 (en) * | 2006-04-20 | 2007-10-25 | Osaka Prefectural Government | Vibration test method, vibration test apparatus and recording medium storing a vibration test program |
| JP2013140067A (en) * | 2012-01-04 | 2013-07-18 | Ihi Corp | Excitation device |
| CN103528775A (en) * | 2012-07-06 | 2014-01-22 | 中山大学深圳研究院 | Structural health detection method based on response sensitivity |
| CN103308270A (en) * | 2013-06-04 | 2013-09-18 | 江苏万工科技集团有限公司 | Measuring method and device thereof for dynamic characteristics of negative open system |
| CN103308265A (en) * | 2013-06-14 | 2013-09-18 | 江苏万工科技集团有限公司 | Device and method for measuring dynamic stiffness frequency-dependent characteristics of return springs |
| CN104008259A (en) * | 2014-06-19 | 2014-08-27 | 东南大学 | Fruit transport package dynamic response analyzing method based on virtual vibration table |
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| 洪翔 等: "多点耦合包装系统动态逆子结构理论试验验证", 《包装工程》 * |
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Application publication date: 20150204 |