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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Historical Version s astk view previous versions of standard. In this way, many product and container resonances are simultaneously excited. Last previous edition approved in as D — If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

See Appendix X1 and Appendix X2 for related information.

ASTM-D4728

Link to Active This link will always route to the current Active version of the standard. They do not purport to accurately describe a speci? Instrumentation may also be desirable for monitoring the response of the test specimen s. 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?

In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances. This test allows analysis of the interaction between these components. Equivalent tests between sine and random, in a satm sense, are difficult to establish due to nonlinearities, damping and product response characteristics. Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report.

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The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control.

For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value.

This is important since random vibration will produce relatively large, low frequency displacements in an unpredictable sequence. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.

When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects. Forest Product Laboratory, Sensors and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item.

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. When the specimen is not secured to the table, restraining devices should be attached to the vibration table to prevent potential movement of the specimen off the vibration table.

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ASTM D – 06 Standard Test Method for Random Vibration Testing of Shipping Containers

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Stop the test immediately if a dangerous condition should develop. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

In the exclusive case of a sine wave, the rms value is 0. d44728

When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects. Adjust the restraining devices to permit free movement of the specimen of approximately 10 mm 0. Any attempt to do so should be done with caution. Therefore, control analysis based on monitoring table motion rather than actual package response is recommended.

ASTM D Random vibration test_百度文库

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. Exact situations must be veri?

For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made.

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