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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See Appendix X1 and Appendix X2 for related information.

This test allows analysis of the interaction between these components. When it is necessary to observe the contents during the test, holes may be cut in noncritical areas of the container.

Last previous edition approved in as D — In this way, many product and container resonances are simultaneously excited.

The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Vibration exposure adtm the shipping container, its interior packing, means of closure, and contents.

Accelerometer mounting location should be next to the test specimen or directly below it on the underside of the table. 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 asstm with actual field shipment effects. Unit loads, stacked columns, or axtm units should be allowed to vibrate freely unless they will actually be securely fastened during shipment, crates on a?

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

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Historical Version s – view previous versions of standard. Such tests may be used to assess the performance of a container with its interior packing and d478 of closure in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. D Terminology of Packaging and Distribution Environments. These sample test pro?

See Appendix X1 and Appendix X2 for related information. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and determine the applicability of regulatory limitations prior to use.

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances.

Creating a Random Vibr The instantaneous amplitudes of a random vibration are prescribed by a probability distribution function, the integral of which over astj given amplitude range will give the probable percentage of time that the amplitude zstm fall within that Copyright?

The equalized drive signals automatically compensate for specimen and vibration test system characteristics. In this way, many product and container resonances are simultaneously excited. The user of random vibration must verify accuracy and applicability of any data of this type prior to its use. Stop the test immediately if a dangerous condition should develop. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution. Random vibration tests should be based on representative field data.

Very steep slopes require smaller bandwidths to maintain control to 63 dB. If a asm load is used, d4278 assessment must be made, after the test is completed, as to whether or not the actual test item would have passed or failed. Two PSD levels that have a ratio of 2. Sensors and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item. The test duration is the zstm at full test level.

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Precision and Bias For the purposes of this test method, the bandwidth may be considered equivalent s4728 the frequency resolution of a spectrum analysis.

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

Power spectral density is the limit of the mean square amplitude in a given rectangular band divided by the bandwidth, as the bandwidth approaches zero. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting c4728 container and its contents to random vibration tests.

This test allows analysis of the interaction between these components. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

ASTM-D4728

Exact situations must be veri? Shipping containers are exposed to complex dynamic stresses in the distribution environment.

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.