This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D on. Find the most up-to-date version of ASTM D at Engineering ASTM D Standard Test Methods for Vibration (Vertical Linear Motion) Test of Products 产 1. Scope These test methods cover.
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Two alternate test methods are presented: Since s3580 damage is most likely to occur at product resonant frequencies, these resonances may be thought of as potential product fragility points.
ASTM D3580 – 95(2015)
This may become necessary if the response of a product would require design of an impractical or excessively costly shipping container. Other, more suitable test procedures should be used for this purpose.
If more applicable or accurate data are available, they should be substituted. Power spectral density is the limiting mean square value in a given rectangular bandwidth divided by the bandwidth, as the bandwidth approaches zero.
The instantaneous magnitudes of random vibration are not prescribed for any given instant in time, but instead are prescribed by a probability distribution function, the integral of which over a given magnitude range will give the probable percentage of the time that the magnitude will fall within that range. In the exclusive d5380 of a sine wave, the rms value is 0. By convention, acceleration is typically specified in terms of zero-to-peak amplitude, while displacement is specified in terms of peak-to-peak amplitude.
ASTM D 产品振动实验的试验方法(垂直正弦曲线运动)_百度文库
Significance and Use 4. The determination of the resonant frequencies of the product may aid the packaging designer in determining the proper d35580 system to provide adequate protection for the product, as well as providing an understanding of the complex interactions between the components of the product as they relate to expected transportation vibration inputs.
The test surface shall be driven to move only in vertical linear motion throughout the desired range of amplitudes and d35800. The mounting devices shall not have significant resonances in the test frequency range.
They shall rigidly mount the product in a manner similar to the way in which it will be supported in its shipping container.
Relative motion between the test surface and the specimen mounting interface shall not be permitted. A stroboscope or video system may be beneficial for visual examination of the specimen under test. Therefore, the means used to fasten the product to the test surface must be of sufficient strength to keep it adequately secured. Operating personnel shall remain alert to potential hazards and take necessary precautions for their safety.
Stop the test method immediately if a dangerous condition should develop. Whenever sufficient products are available, five or more replicate samples should be tested to improve the statistical reliability of the data obtained see practice E Sensor s may be applied as appropriate to measure data points of interest with the minimum possible alteration of the test specimen.
ASTM D – 95() Standard Test Methods for Vibration (Vertical Linear Motion) Test of Products
Parts and surfaces of the specimen may be marked for identification and reference. When necessary to observe interior components of the product during tests, holes may be cut in noncritical area or noncritical panels may be removed. Caution is necessary to avoid excessive pressure or mounting methods that could influence the characteristics of the product.
Experience has shown that most individual transportation environments contain frequencies ranging from 3 Hz to Hz. Acceleration levels sufficient to excite resonance normally range from 0. Starting at 3 Hz, vary the frequency of vibration at a continuous logarithmic rate of 0.
Record any resonant responses of the product, repeat the cycle if necessary. It is recommended that tests be initiated at least 6 dB below full level and incremented in one or more subsequent astj to full test level.
This time is dependent upon the characteristics of the vibration test machine and control system, the setup, and the weight and characteristics of the test specimen. It is recommended that the minimum frequency range be from 3 to Hz, the overall amplitude s of d380 spectrum be not less than 0.
Record any resonant responses of the product. Mount the accelerometer to either the top or bottom of the test surface, as close to the test item as possible, or in a location which produces data representative of table motion.
Use a stroboscope; sensors and readouts; and visual, auditory, or other means as applicable to determine these resonances. Any resonances with transmissibilities of 2 or greater may be considered significant.
For sine testing, the frequency sweep may be interrupted or reversed if necessary for short time periods in asmt to properly identify a resonating component. Ast sine testing, if different frequencies are recorded for each resonating component on the upsweep as compared to the downsweep a typical situationrecord both frequencies and the corresponding sweep direction.
Dwell time, acceleration level, and damage criteria are to be specified by the user. Adjust the frequency of the vibration as necessary to maintain resonance.
Test duration, random spectrum, and damage criteria are to be specified by the user. For spectrum examples, see