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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Asrm reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances.
ASTM D Random vibration test_百度文库
Last previous edition approved in as D — This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Users asttm 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. This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci?
Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Resonance buildups during random vibration tests are less intense than during sinusoidal resonance dwell or sweep tests.
Historical Version s – view previous versions of standard. Two PSD levels that have a ratio of 0. This test allows analysis of the interaction between these components. Adjust the restraining devices to permit free movement of the specimen of approximately 10 mm 0. This actual data, from Ref 7represents a leaf spring trailer with a 40 lb 18 kg load traveling at 55 mph on a concrete interstate expressway.
Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents d478 random vibration tests. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.
See Appendix X1 and Appendix X2 for related information. Sources of supplementary information are listed in the Reference section 1- Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Current edition approved Oct. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.
In terms of a vibration system, it is the ratio of output response to a constant input over a de? Link to Active D472 link will always route to the current Active version of the standard.
For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. 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 d4278 subjected to random vibration inputs. Therefore, control analysis based on monitoring table motion x4728 than actual package response is recommended. 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?
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Instrumentation may also be desirable for monitoring the response of the test specimen s. However, different test levels may be utilized for each axis depending on the field environment that is to d47228 simulated. This table feedback signal is generated by an accelerometer mounted directly to the table. However, different test levels may be utilized for each axis depending on the?
Any attempt to do so should be done with caution. This aastm allows analysis of the interaction between these components. Time spent during start up is not included. 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.
For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value.
Stop the test immediately if a dangerous condition should develop. Therefore, fences, barricades, and other restraints must have sufficient strength and must be adequately secured.
However, different test levels may be utilized for each axis depending on the field environment that is to be simulated. 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.
See Appendix X1 and Appendix X2 for related information. Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. For more information visit www.
Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report. 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.
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. Random vibration may be conducted in any axis vertical or horizontal or in any package orientation.
Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.
Calibration and Standardization 8. 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.
A number in parentheses indicates the year of last reapproval.