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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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. Such tests asgm be used to assess the performance of a container with its interior packing and d4278 of closure in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs. Two PSD levels that have a ratio of 0. Very steep slopes require smaller bandwidths to maintain control to 63 dB.

ASTM-D4728

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. This is important since random vibration will produce relatively large, low frequency displacements in an unpredictable sequence.

See Appendix X1 and Appendix X2 for related information. Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics. Shipping containers are exposed to complex dynamic stresses in the distribution environment. For the purposes of this test method, the bandwidth may be considered equivalent to the frequency resolution of a spectrum analysis.

For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value. Sources of supplementary information are listed in the Reference section 1- This test allows analysis of the interaction between these components. 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?

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Approximating the actual damage, or lack of damage, experienced in real life may require astk the container and its contents to random vibration tests. Accelerometer mounting location should be next to the test specimen or directly below it on the underside of the table.

Refer to Practice D for recommended random vibration tests. A number in parentheses indicates the year of last reapproval. Last previous edition approved in as D — Historical Version s – view previous versions of standard.

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

Calibration and Asm 8. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. Therefore, fences, barricades, and other restraints must have sufficient strength and must be adequately secured. 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?

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

The specimen center of gravity should be as near as practicable to the center of the table. When no conditioning requirements are given, and the container materials are climatically sensitive, a conditioning atmosphere is recommended see Practice D for standard and special conditions. 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. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

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

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Such tests may be used to assess the performance of a container with its interior packing and means of closure in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs.

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. Therefore, unrealistic fatigue damage due to resonance buildup is minimized. When it is necessary to observe the contents during the test, holes may be cut in noncritical areas of the container. C4728 Product Laboratory, Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

Link to Active This link will always route to the current Active version of the standard.

The vibration table shall be supported by a mechanism capable of producing single axis vibration inputs at controlled levels of continuously variable amplitude throughout the desired range of frequencies. This table feedback signal is generated by an accelerometer mounted directly to the table. Stop the test immediately if a dangerous condition should develop.

Two PSD levels that have a ratio of 2. The equalized drive signals automatically compensate for specimen and vibration test system characteristics.