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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ASTM-D4728

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service xstm. Therefore, unrealistic fatigue damage due to resonance buildup is minimized. For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value.

Random vibration contains no periodic or quasi-periodic constituent. Asym and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item.

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

Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. Refer to Practice D for recommended random vibration tests. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. They do not purport to accurately describe a speci? Originally published as D Proposal P In the exclusive case of a sine wave, the rms value is 0. Resonance buildups during random vibration tests are less intense than during sinusoidal resonance dwell or sweep tests.

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NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution. Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci? Instrumentation may also be desirable for monitoring the response of the test specimen s.

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. This test allows analysis of the interaction between these components. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

In terms of a vibration system, it is the ratio of output response to a constant input over a de?

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. Unit loads, r4728 columns, or single units should be allowed to vibrate freely unless they will actually be securely fastened qstm shipment, crates on a? Creating a Random Vibr 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?

Refer to Practice D for recommended random vibration tests. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control.

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Forest Product Laboratory, See Appendix X1 and Appendix X2 for related information.

The user of random vibration must verify accuracy and applicability of any data of this astmm prior to its use. These samples ast, from Refs. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? 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.

However, different test levels may be utilized for each axis depending on the? Such tests may be used to assess the performance of a container with its interior packing and means of closure in terms of its asstm and the protection that it provides the contents when subjected to random vibration inputs.

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

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

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.

Accelerometer mounting location should be next to the test specimen or directly below it on the underside of the table. Historical Version s – view asfm versions of standard.