April 3, 2019

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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Refer to Practice D for recommended random vibration tests. Two PSD levels that have a ratio of 0. Adjust the restraining devices to permit free movement of the specimen of approximately 10 mm 0. The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control.

Sensors and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item.

Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

They do not purport to accurately describe a speci? Random vibration may be conducted in any axis vertical or horizontal or in any package orientation. This test allows analysis of the interaction between these components. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

In the exclusive case of a sine wave, the rms value is 0. Refer to Practice D for recommended random vibration tests. Random vibration contains no periodic or quasi-periodic constituent.

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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.

Last previous edition approved in as D — See Appendix X1 and Appendix X2 for related information. This test allows analysis of the interaction between these components. This table feedback signal is generated by an accelerometer mounted directly to the table. Forest Product Laboratory, Such tests asym 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.

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For the purposes of this test method, the bandwidth may be considered equivalent to the frequency resolution of a spectrum analysis. However, different test levels may be utilized for each axis depending on the?

Shipping containers are exposed to complex dynamic stresses in the distribution environment. Blemished or adtm products may be used if the defect will not affect test results and if the defect is documented in the report. The equalized drive signals automatically compensate for specimen and vibration test system characteristics.

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

Stop the test immediately if a dangerous condition should develop. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. However, different test levels may be utilized for astk axis depending on the field environment that is to be simulated.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

The instantaneous amplitudes of a random vibration are prescribed by a probability distribution function, the integral atm which over a given amplitude range will give the probable percentage of time that the amplitude will fall within that Copyright? 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. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.

Originally published as D Proposal P Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product 4d728 characteristics.

Therefore, fences, barricades, and other restraints asgm have sufficient strength and must be adequately secured. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.

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Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Very steep slopes require smaller bandwidths to maintain control to 63 dB. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. D Terminology of Packaging and Distribution Environments.

Exact situations must be veri?

This actual data, from Ref 7represents a leaf spring trailer with d47228 40 lb 18 kg load traveling at 55 mph on a concrete interstate expressway. Specific safety hazard statements are given in Section 6. 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.

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. 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.

ASTM-D4728

Two PSD levels that have a ratio of 2. 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? This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci?

Equivalent tests between sine v4728 random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics. However, different test levels may be utilized for each axis depending on the field environment that is to be simulated.