GB/T 4857.23-2021Packaging - Basic tests for transport packages - Part 23: Vertical random vibration test method (English PDF)

Foreword

This document was drafted as per the rules specified in GB/T 1.1-2020 Directives for

Standardization - Part 1.Rules for the Structure and Drafting of Standardizing

Documents.

This Document is Part 23 of GB/T 4857.GB/T 4857 has published the following parts.

--- Packaging - Basic tests for transport packages - Part 1.Identification of parts

when testing;

--- Packaging - Basic tests for transport packages - Part 2.Temperature and

humidity conditioning;

--- Packaging - Basic tests for transport packages - Part 3.Stacking tests using

static load;

--- Packaging - Basic tests for transport packages - Part 4.Compression and

stacking tests using a compression tester;

--- Packaging -transport packages - fall test methods;

--- Packaging -transport packages - rolling test methods;

--- Packaging - Basic tests for transport packages - Part 7.Sinusoidal vibration test

method at constant frequency;

--- Packaging - Basic tests for transport packages - Part 9.Water spray test;

--- Packaging - Basic tests for transport packages - Part 10.Sinusoidal vibration

test method using a variable vibration frequency;

--- Packaging - Basic tests for transport packages - Part 11.Horizontal impact test

methods;

--- Packaging -transport packages - Immersed water test method;

--- Packaging - Basic tests for transport packages - Part 13.Low air pressure test

method;

--- Packaging -transport packages - Topping test method;

--- Packaging - Basic tests for transport packages - Part 15.Controlled horizontal

impact test method;

--- Packaging - Basic tests for transport packages - Part 17.General rules for the

compilation of performance test;

--- Packaging -transport packages - Information record of the flow test;

--- Packaging -transport packages - Crash test method;

--- Packaging -transport packages - Stability test method for unit loads;

--- Packaging - Basic tests for transport packages - Part 23.Vertical random

vibration test method.

This Document replaced GB/T 4857.23-2012 Packaging - Basic tests for transport

packages - Part 23.Random vibration test method. Compared with GB/T 4857.23-

2012, this Document made the following technical changes as follows besides the

structural adjustments and editorial modifications.

a) Change the scope of application and change random vibration into vertical

random vibration (see Clause 1 of this Edition; Clause 1 of the 2012 Edition);

b) Delete equalization, sigma drive signal clipping and closed loop in "Terms and

Definitions" (see 3.1, 3.3, 3.4 of 2012 Edition);

c) Add 3 kinds of devices that can be equipped with the vibration table to limit the

test sample state (see 5.1 of this Edition);

d) Change the frequency resolution from 2Hz to 1Hz (see 5.1 of this Edition; 5.2.3

of 2012 Edition);

e) Delete the closed-loop control system (see 5.2.1, 5.2.2 of 2012 Edition);

f) Change the statistical degrees of freedom [see 5.2c) of this Edition; 5.2.3 of 2012

edition];

g) Delete the choice of test intensity (see 6.5 of 2012 Edition);

h) Delete equipment calibration (see 6.6 of 2012 Edition);

i) Add the limit of horizontal vibration component (see 6.5.3 of this Edition);

j) Add the requirement of collecting power spectral density for testing (see 6.5.7 of

this Edition);

k) Add the requirements for the acceleration root mean square value and power

spectral density deviation (see 6.5.8 of this Edition);

l) Delete the requirements for samples to be placed in an unfixed way and fixed way

on the vibration table (see 6.7.4 and 6.7.5 of 2012 Edition);

m) Delete the requirement to stop the test when the test sample has predetermined

damage (see 6.7.7 of 2012 Edition);

n) Delete the requirement to increase the test intensity for shortening the test time

(see 6.7.8 of 2012 edition).

This Document uses the redrafting method to modify and adopt ISO 13355.2016

Packaging - Complete, filled transport packages and unit loads - Vertical random

vibration test.

Compared with ISO 13355.2016, this Document has the structural changes.

a) Add the Clause 3 "Terms and Definitions".

b) Adjust the Clause 3 of ISO 13355.2016 into Clause 4 of this Document.

c) Adjust the Clause 4 of ISO 13355.2016 into Clause 5 of this Document; adjust

1 Scope

This Document specifies the vertical random vibration test principles, test equipment,

test procedures and test reports of transport packages.

This Document is applicable to the vertical random vibration test of transport packages

or unit loads

2 Normative References

The provisions in following documents become the provisions of this Document

through reference in this Document. For the dated documents, only the versions with

the dates indicated are applicable to this Document; for the undated documents, only

the latest version (including all the amendments) is applicable to this Document.

GB/T 4122.5 Packaging terms - Part 5.Inspection and test

GB/T 4857.1 Packaging - Basic tests for transport packages - Part 1.Identification

of parts when testing (GB/T 4857.1-2019, ISO 2206.1987, MOD)

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in GB/T 4122.5 and

the following apply.

The square mean value of the acceleration signal of random vibration at unit frequency.

The square root value of the PSD integral value in the entire frequency range.

4 Test Principle

Under the specified environmental conditions, the test sample is placed on the

vibration bench in a predetermined direction and fixed manner, and within a certain

frequency range, a vertical random vibration test is carried out for a certain period of

time according to the predetermined test intensity.

5 Test Equipment

The vibrating bench shall have a sufficiently large size, sufficient strength, rigidity and

load-bearing capacity. The structure shall be able to ensure that the surface of the

vibration bench remains horizontal when vibrating. And its lowest resonance frequency

shall be higher than the highest test frequency.

The vibration bench can be equipped with the following auxiliary devices.

6 Test Procedure

According to the provisions of GB/T4857.2, select a condition to pre-treat the

temperature and humidity of the test sample.

The test shall be started with a vibration lower than the predetermined PSD 6dB, so

that the control system is balanced at a lower test intensity; and then the test intensity

is increased in one or more steps until it reaches the predetermined value and

completes the random vibration for the predetermined time. The adjustment time of

vibration intensity is not included in the test time.

7 Test Report

The test report shall include the following information.

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