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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This actual atsm, from Asstm 7represents a leaf spring trailer with a 40 lb 18 kg load traveling at 55 mph on a concrete interstate expressway. Precision and Bias 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. This is important since random vibration will produce relatively large, low frequency displacements in an unpredictable sequence.

Random vibration may be conducted in any axis vertical or horizontal or in any package orientation. 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. Such tests may be used to assess the performance of a container with its interior packing and means of asym in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs.

This test allows analysis of the interaction between these components. For the purposes of this test method, the bandwidth may be considered equivalent to the frequency resolution of a spectrum analysis. In the exclusive case of a sine wave, the rms value is 0. When it is necessary to observe the contents during the test, holes may be cut in noncritical areas of the container. Dummy test loads are acceptable if testing the actual product might be hazardous or cost prohibitive.

ASTM-D4728

Specific safety hazard statements are given in Section 6. In terms of a vibration system, it is the ratio of output response to a constant input over a de? These samples are from Refs. The instantaneous amplitudes of a random vibration are prescribed by a probability distribution function, the integral of which over a given amplitude d728 will give the probable percentage of time that the amplitude will fall within that Copyright? Power spectral density is the limit of the mean square amplitude in a given rectangular band divided by the d47288, as the bandwidth approaches zero.

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Originally published as D Proposal P This table feedback signal is generated by an accelerometer mounted directly to the table. Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Creating a Random Vibr Refer to Practice D for recommended random vibration tests.

ASTM-D – Medical Package Testing

For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. Time spent during start up is not included. 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.

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

Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. However, different test levels may be utilized for each axis depending on the field environment that is to be simulated. 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.

Vibration exposure affects the shipping container, its interior packing, means of closure, and contents.

The specimen center of gravity should be as near as practicable to the center of the table. Current edition approved Oct. 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. However, different test levels may be utilized for each axis depending on the field environment that is to be simulated. Random vibration contains no periodic or quasi-periodic constituent.

Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and d428 contents to random vibration tests. Two PSD levels that have a ratio of 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report. Approximating the actual damage, astmm lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. Very steep slopes require smaller bandwidths to maintain control to 63 dB.

See Appendix X1 and Appendix X2 for related information. The test duration is the time at full test level.

D47728 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. However, different test levels may be utilized for each axis depending on the?

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? These sample test pro? The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control. They do not purport to accurately describe a speci?

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. Resonance buildups during random vibration tests are less intense than during sinusoidal resonance dwell or sweep tests.

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. Any attempt to do so should be done with caution.