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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Therefore, fences, barricades, and other restraints must have sufficient strength and must be adequately secured. In terms of a vibration system, it is the ratio of output response to a constant input over a de? 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 ast, of infringement of such rights, are entirely their own responsibility. Precision and Bias Equivalent tests between sine and random, in a general sense, are difficult to establish due to d47288, damping and product response characteristics.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci?

D Terminology of Packaging and Distribution Environments.

Random vibration may be conducted in any axis vertical or horizontal or in any package orientation. 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. Two PSD levels that have a ratio of 2. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. 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.

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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.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? In this way, many product and container resonances are simultaneously excited.

Typical systems include an analog to digital converter for conditioning feedback signals, a digital to analog converter to produce drive signals, a digital processor with real time analysis capability, random vibration control software programs, a graphics display terminal, printer, and a data storage unit. Originally published as D Proposal P Time spent during start up is not included. Very steep slopes require smaller bandwidths to maintain control to 63 dB.

Calibration and Standardization 8. Link to Active This link will always route to the current Active version of the standard. Shipping containers are exposed to complex dynamic stresses in the distribution environment. Historical Version s – view previous versions of standard. Stop the test immediately if a dangerous condition should develop.

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.

ASTM-D4728

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Asmt to Practice D for recommended random vibration tests. 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 should be based on xstm field data. See Appendix X1 and Appendix X2 for related information. This test allows analysis of the interaction between these components. The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control.

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These sample test pro? This is important since random vibration will produce relatively large, low frequency displacements in an unpredictable sequence. Such tests may be used to assess the performance of a container with its interior packing and means of v4728 in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs.

A number in parentheses indicates the year of last reapproval. This test allows aetm 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. Exact situations must be veri? 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. These samples are from Refs.

Forest Product Laboratory, Last previous edition approved in as D — Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Current edition approved Oct.

ASTM-D – Medical Package Testing

For more information visit www. Sources of dd4728 information are listed in the Reference section 1- Therefore, unrealistic fatigue damage due to resonance buildup is minimized. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution.

Such tests axtm 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.