This standard specifies the main performance requirements of the test equipment used in the random vibration test of transport packages and assembly units, the test procedure
and the content of the test report.
This standard applies to the evaluation of transport packaging, packaging unit subjected to random vibration, the strength of the inner and outer packaging, the sealing strength of the box and
packaging on the protection of the contents of the ability. It can be used either as a single test or as part of a series of tests. 5.6.1 Record the temperature and humidity of the test site.
5.6.2 Place the test specimen on the shaker table in a predetermined state.
5.6.2.1 The center of gravity of the test specimen is placed as close to the center of the table as possible to ensure that the expected vibration (horizontal or vertical) is transmitted to the outer packaging.
5.6.2.2 Collective loads, stacked vibrations, or individual packaged parts shall be placed using a non-fixed method, with the packaged part surrounded by a frame so that it will not fall off the table during vibration. Adjust the position of the protective facility so that the test specimen has approximately 10 mm of movement in any horizontal direction.
5.6.2.3 The sample is placed in a fixed position during the test only if the package needs to be secured under realistic transportation conditions (e.g., flatbed truck).
5.6.3 When the test is first started, it must be ensured that the strength must not exceed the strength of the chosen PSD curve.
5.6.4 The test shall be conducted in accordance with the following two methods:
5.6.4.1 Method A: The test shall be started at a minimum of 6 dB below the predetermined PSD and then the intensity shall be increased in one or more steps until the predetermined
value is reached, allowing the closed-loop control system to complete the equalization at the lower test intensity.
5.6.4.2 Method B: The drive signal of the control system shall be incrementally increased so that the test intensity is gradually increased to the predetermined intensity value.
Note 1: For a completely new test procedure, random vibration produces a displacement with a relatively large amplitude at low frequencies.
Note 2: The test specimen may have a strong mechanical reaction during the test. Therefore, fences, protectors, etc. should be of sufficient strength and safety. Always be alert to potential hazards during operation and take safety measures in advance. If danger occurs, stop the test immediately.
5.6.5 Time
5.6.5.1 Continue vibration until a predetermined period of random vibration is completed, or until damage to the package occurs. This period of
vibration is accomplished exclusively at the predetermined intensity, and the time spent adjusting the intensity of vibration is not counted.
5.6.5.2 The test time may be reduced by increasing the test intensity.
5.6.5.3 It is permissible to adjust the test time and PSD based on the actual breakage rate when feedback from the actual circulation process can be obtained.
For example, a laboratory test that does not produce an actual level of transportation damage can be adjusted.