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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Precision and Bias Such tests may be used d7428 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 ast random vibration inputs. In this way, many product and container resonances are simultaneously excited.
Exact situations must be veri? A number in parentheses indicates the year of last reapproval. Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics.
When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects. Random vibration tests should be based on representative field data. Creating a Random Vibr 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.
The controller automatically generates equalized vibration test system drive signals to achieve the desired PSD thus maintaining closed loop control. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution. 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.
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. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Resonance buildups during random vibration tests are less intense than during sinusoidal resonance dwell or sweep tests. Refer to Practice D for recommended random vibration tests. For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value. Adjust the restraining devices to permit free movement of the specimen of approximately 10 mm 0.
ASTM-D – Medical Package Testing
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 d44728 vibration inputs.
Vibration exposure affects the shipping container, its interior packing, means of closure, and contents. Therefore, control analysis based on monitoring table motion rather than actual package response is recommended. This table feedback signal is generated by an accelerometer mounted directly to the table. The number of DOF is determined by the analysis bandwidth frequency resolution and total time of the sample determined by frequency resolution r4728 number of averages.
D Terminology of Packaging and Distribution Environments. This is important since random vibration will produce relatively large, low frequency displacements in an unpredictable sequence.
Approximating the actual damage, or lack of damage, experienced dd4728 real life may require subjecting the container and its contents to random vibration tests. The user of random vibration must verify accuracy and applicability of any data of this type prior to its use. Accelerometer mounting location should be next to atm test specimen or directly below it on the underside of the table.
This data must then be reduced to PSD format and equalized for proper control of the vibration system In the absence of speci? 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. For the purposes of this test method, the bandwidth may be considered equivalent to the frequency resolution of a spectrum analysis.
Two PSD levels that have a ratio of 0. Typical 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. When it is necessary to observe the contents during the test, holes may be cut in noncritical areas of the container.
In terms of a vibration system, it is the ratio of output response to a constant input over a de? Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to random vibration tests. Shipping containers are exposed to complex dynamic stresses in the distribution environment. Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Approximating the actual damage, or lack of damage, experienced in real life may require subjecting the container and its contents to 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. 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 and health practices and determine the applicability of regulatory limitations prior to use. Sources of supplementary information are listed in the Reference section 1- This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Originally published as D Proposal P Historical Version s – view previous versions of standard. 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.
ASTM D – 06 Standard Test Method for Random Vibration Testing of Shipping Containers
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 field environment that is to be simulated. For example, if the laboratory test does not produce a realistic level of damage, then adjustments should be made. 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?
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
In this way, many product and container resonances are simultaneously excited. Blemished or rejected products may be used if the defect will not affect test results and if the defect is documented d4782 the report.