ASTM D4728 PDF

ASTM D Standard Test Method for Random Vibration Testing of Shipping Containers has been released. It revises and replaces the. This standard is issued under the fixed designation D ; the number immediately 1 This test method is under the jurisdiction of ASTM Committee D10 on. ASTM D Standard Test Method for Random Vibration Testing of Shipping Containers.

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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Therefore, unrealistic fatigue damage due to resonance buildup f4728 minimized.

Random vibration contains no periodic or quasi-periodic constituent. Therefore, control analysis based on monitoring table motion rather than actual package response is recommended.

ASTM-D4728

It is the responsibility of the user of this standard to wstm appropriate safety, health and environmental practices and determine the applicability of regulatory limitations prior to use.

Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances.

Refer to Practice D for recommended random vibration tests.

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Ast, test duration is the time at full test level. However, different test levels may be utilized for each axis depending on the? Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics.

Calibration and Standardization 8.

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Field measurements must be accurately recorded with equipment having adequate frequency response and dynamic range to prevent attenuation or noise contamination of the acceleration energy levels. Any attempt to do so should be done with caution.

When the specimen is not secured to the table, restraining devices should be attached to the asrm table to prevent potential movement of the specimen off the vibration table. Therefore, unrealistic fatigue damage due to resonance buildup is minimized. In terms of a vibration system, it is the ratio of output response to a constant input over a de?

Exact situations must be veri? See Appendix X1 and Appendix X2 for related information.

ASTM D – 17 Standard Test Method for Random Vibration Testing of Shipping Containers

Stop the test immediately if a dangerous condition should develop. This test allows analysis of the interaction between these components.

Unit loads, stacked columns, or single units should be allowed to vibrate freely unless they will actually be securely fastened during shipment, crates on a? The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control. The equalized drive signals automatically compensate for specimen and vibration test system characteristics.

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Two PSD levels that have a ratio of 2. They do qstm purport to accurately describe a speci? In this way, many product and container resonances are simultaneously excited.

Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.

astk The number of DOF is determined by the analysis bandwidth frequency resolution and total time of the sample determined by frequency resolution and number of averages. Specific safety hazard statements are given in Section 6.

This enables the closed loop control system to complete its equalization at lower test levels and provides the operator adequate opportunity to visually verify that the test specimen and? When it is necessary to observe the contents during the test, holes may be cut in noncritical areas of the container. Two PSD levels that have a ratio of 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

For more information visit www. Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report.