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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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Two PSD levels that have a ratio of 0.

Exact situations must be veri? This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci?

The equalized drive signals automatically compensate for specimen and vibration test system characteristics. 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.

Such tests may be used to assess the performance of a container with its interior packing and means of closure in d7428 of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs. 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.

Such tests may be used to asttm 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. The asmt of DOF is determined by the analysis bandwidth frequency resolution and total time of the sample determined by frequency resolution and number of averages.

Therefore, fences, barricades, and other restraints must have sufficient strength and must be adequately secured. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Therefore, unrealistic fatigue damage due to resonance buildup is minimized.

This table feedback signal is generated by an accelerometer mounted directly to the table. Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report. ASTM International takes no position axtm the validity of any patent rights asserted in connection with any item mentioned in this standard. Very steep slopes require adtm bandwidths to maintain control to 63 dB. Refer to Practice D for recommended random vibration tests.

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For more information visit www. Precision and Bias For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made.

Specific safety hazard statements are given in Section 6.

ASTM-D4728

Therefore, d47228 fatigue damage due to resonance buildup is minimized. However, different test levels may be utilized for each axis depending on the field environment that is to be simulated. Equivalent tests between sine and 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?

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Adjust the restraining dd4728 to permit free movement of the specimen of approximately 10 mm 0. In terms of a vibration system, it is the ratio of output response to a constant input over a de? This enables the closed loop control system to complete its equalization at lower test levels and provides the operator adequate opportunity to visually verify that the test specimen and?

In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Dummy test loads are acceptable if testing the actual product might be hazardous or cost prohibitive.

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

Random vibration contains no periodic or quasi-periodic constituent. 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. Calibration and Standardization 8.

This test allows analysis of the interaction between these components. 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. The instantaneous amplitudes of a random vibration are prescribed by a probability distribution function, the integral of which over a given amplitude range will give the probable percentage of time that the amplitude will fall within that Copyright?

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However, different test levels may be utilized for each axis depending on the field environment that is to be simulated. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

Forest Product Laboratory, 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. Therefore, control analysis based on monitoring table motion rather than actual package response is recommended.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Any attempt to do so should be done with caution. They do not purport to accurately describe a speci? In this way, many product and container resonances are simultaneously excited.

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. Stop the test immediately if a dangerous condition should develop. Two PSD levels that have a ratio of 2. Current edition approved Oct. Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

Random asm may be conducted in any axis vertical or horizontal or in any package orientation. 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.