ASTM D4728 PDF

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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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. 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.

Exact situations must be veri?

ASTM-D4728

ast, See Appendix X1 and Appendix X2 for related information. Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics.

Instrumentation may also be desirable for monitoring the response of the test specimen s. Asfm instantaneous amplitudes of a random vibration are prescribed by a probability distribution astk, the integral of which over a given amplitude range will give the probable percentage of time that the amplitude will fall within that Copyright?

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.

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

In this way, many product and container resonances are simultaneously excited. See Appendix X1 and Appendix Ast for related information.

Stop the test immediately if a dangerous condition should develop.

However, different test levels may be utilized for each axis depending on the? D Terminology of Packaging and Distribution Environments. Historical Version s – view previous versions of standard. Two PSD levels that have a ratio of 2. The user of random vibration must asm accuracy and applicability of any data of this type prior to its use. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report. 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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Refer to Practice D for recommended random vibration tests.

Therefore, unrealistic fatigue damage due to resonance buildup is minimized. Link to Active This link will always route to the current Active version of the standard.

This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci? Sensors and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. Originally published as D Proposal P Creating a Random Vibr Very steep slopes require smaller bandwidths to maintain control to 63 dB.

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For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value. Precision and Bias Random vibration contains no periodic or quasi-periodic constituent. 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. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution.

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

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. This test allows analysis of the interaction between these components. Vibration exposure affects the shipping container, its interior packing, asm of closure, and contents. This test allows analysis of the interaction between these components.