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 d44728 automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control. Refer to Practice D for recommended random vibration tests. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Very steep slopes require smaller bandwidths to maintain control to 63 dB. These sample test pro?

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

Dummy test loads are acceptable if testing the actual product might be hazardous or cost prohibitive. Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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

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The equalized drive signals automatically compensate for specimen and vibration test system characteristics. Stop the test immediately if a dangerous condition should develop.

See Appendix X1 and Appendix X2 for related information. Therefore, fences, barricades, and other restraints must have sufficient strength and must be adequately secured.

When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects. NOTE 2—Random vibration systems typically astmm a drive signal that follows the Gaussian distribution. These samples are from Refs.

ASTM D Random vibration test_百度文库

See Appendix X1 and Appendix X2 for related information. Therefore, unrealistic fatigue damage due to resonance buildup is minimized.

Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. Current edition approved Oct. In this way, many product and sstm resonances are simultaneously excited.

The number of DOF is determined by the analysis bandwidth frequency resolution and total time of the r4728 determined by frequency resolution and number of averages. This actual data, from Ref 7represents a leaf spring trailer atm a 40 lb 18 kg load traveling at 55 mph on a concrete interstate expressway. D Terminology of Packaging and Distribution Environments.

This table feedback signal is generated by an accelerometer mounted directly to the table. Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Random vibration may be conducted in any axis vertical or horizontal or in any package orientation. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

Time spent during start up is not included. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made.

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ASTM-D4728

The test duration is the time at full test level. In terms of a vibration system, it is the ratio of output response to a constant input over a de? Therefore, control analysis based on monitoring table motion rather than actual package response is recommended.

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. Creating a Random Vibr Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics.

Originally published as D Proposal P 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.

Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. This test allows analysis of the interaction between these components.

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

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?

However, different test levels may be utilized for each axis depending on the?

Two PSD levels that have a ratio of 0.