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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The instantaneous amplitudes of a random vibration are prescribed 4d728 a probability distribution function, the integral of which over a given amplitude range will give asrm probable percentage of time that the amplitude will fall within that Copyright? 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.

For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value.

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. A number in parentheses indicates the year of last reapproval. 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 d47288 vibration inputs.

Shipping containers are exposed to complex dynamic stresses in the distribution environment. Refer to Practice D for recommended random vibration tests. Random vibration may be conducted in any axis vertical or horizontal or in any package orientation. This test allows d47288 of the interaction between these components.

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

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.

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

ASTM-D4728

The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control. Very steep slopes require smaller bandwidths to maintain control to 63 dB. The specimen center of gravity should be as near as practicable to the center of the table.

Therefore, fences, barricades, and other restraints must have sufficient strength and must be adequately secured. Resonance buildups during random vibration tests are less intense than during sinusoidal resonance dwell or sweep tests. Creating a Random Vibr 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. D Terminology of Packaging and Distribution Environments.

These sample test pro? Exact situations must be veri?

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. This test allows analysis of the interaction between these components. Therefore, unrealistic fatigue damage due to resonance buildup is minimized.

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. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made.

Adjust the restraining devices to permit free movement of the specimen of approximately 10 mm 0.

Random vibration contains no periodic or quasi-periodic constituent. Last previous edition approved in as D — 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?

Refer to Practice D for recommended random vibration tests. Sensors and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item. In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances. Two PSD levels that have a aetm of 0. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution.

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Two PSD levels that have a ratio of 2. These samples are from Refs. 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. Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. If you feel that your comments have not received a fair hearing you should make your views known to astn ASTM Committee on Standards, at the v4728 shown below.

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

For the purposes of this test method, the bandwidth may be considered equivalent to the frequency resolution of a spectrum analysis.

When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects. Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

The user of random vibration must verify accuracy and applicability of any data of d428 type prior to its use.

Sources of supplementary information are listed in the Reference section 1- When no conditioning requirements are given, and the container materials are climatically sensitive, a conditioning atmosphere is recommended see Practice D for standard and special conditions. Current edition approved Oct. However, different test levels may be xstm 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.