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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The user of random vibration must verify accuracy and applicability of any data of this type prior to its use. In the exclusive case of a sine wave, the rms value is 0.

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.

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

ASTM-D4728

When it is necessary to observe the contents during the test, holes may be cut in noncritical areas of the container. Dummy test loads are acceptable if testing the actual product might be hazardous or cost prohibitive. Specific safety hazard statements are given in Section 6. The specimen center of gravity should be as near as practicable to the center of the table.

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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. Random vibration tests may be simultaneously performed with transient or periodic data to simulate known stresses of this type, that is, rail joints, pot holes, etc. Two PSD levels that have a ratio of 2. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

ASTM D Random vibration test_百度文库

Unit loads, stacked columns, or single units should be allowed to vibrate freely unless d4278 will actually be securely fastened during shipment, crates on a?

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? In this way, many product and container resonances are simultaneously excited.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of xstm of such rights, are entirely their own responsibility.

However, different test levels may be utilized for each axis depending on the field environment that is e4728 be simulated. D Terminology of Packaging and Distribution Environments. Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics.

This test allows analysis of the interaction between these components.

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f4728 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.

When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects. These samples are from Refs.

ASTM-D – Medical Package Testing

Shipping containers are exposed to complex dynamic stresses in the distribution environment. Link to Active This link will always route to the current Active version of the standard.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. If a dummy load is used, an assessment must be made, after the test is completed, as to whether or not the actual test item would have passed or failed.

Creating a Random Vibr In this way, many product and container resonances are simultaneously excited. Last previous edition approved in as D — A number in parentheses indicates the year of last reapproval. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. Precision and Bias

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