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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See Appendix X1 and Appendix X2 for related information. This table feedback signal sstm generated by an accelerometer mounted directly to the table. They do not purport to accurately describe a speci?
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. Instrumentation may also be desirable for monitoring the response of the test specimen s.
This test allows analysis of the interaction between these components. Power spectral density is the limit of the mean square amplitude in aatm given rectangular band divided by the bandwidth, as the bandwidth approaches zero.
When it is necessary zstm observe the contents during the test, holes may be cut in noncritical areas of the container. These samples are from Refs. 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 the exclusive case of a sine wave, the rms value is 0.
ASTM D – 06 Standard Test Method for Random Vibration Testing of Shipping Containers
See Appendix X1 and Appendix X2 for related information. Forest Product Laboratory, Random vibration tests should be based on representative field data. Resonance buildups during random asmt tests are less intense than during sinusoidal resonance dwell or sweep tests.
In this way, ASTM-D standard test method for random vibration testing of shipping containers simultaneously excite many product and container resonances. These sample test pro? This test allows analysis of the interaction between these components.
Approximating the astmm damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.
Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented in the report. Xstm mounting location should be next to the test specimen or directly below it on the underside of the table. This test allows analysis of the interaction between these components.
ASTM D – 17 Standard Test Method for Random Vibration Testing of Shipping Containers
Therefore, unrealistic fatigue damage due to resonance buildup is minimized. The specimen center of gravity should be as near as practicable to the center of the table. Refer to Practice D for recommended random vibration tests. For the purposes of this test method, the bandwidth may be considered equivalent to the frequency resolution of a spectrum analysis.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value. The controller automatically generates equalized vibration test system drive signals to c4728 the desired PSD thus maintaining closed loop control.
Originally published as D Proposal P 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. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests.
Random vibration contains no periodic or quasi-periodic constituent. Shipping containers are exposed to complex dynamic stresses in the distribution environment.
Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. Specific safety hazard statements are given in Section 6.
A number in parentheses indicates the year of last reapproval. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution.
The equalized drive signals automatically compensate for specimen and vibration test system characteristics. 4d728 to Practice D for recommended random vibration tests.