Test procedure

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Test procedure

Method A1 and Method A2 - Repeated vibration test:

The test sample is placed on the test platform according to the normal transportation placement position, and the attachment device is used to limit the sample from falling off the test plane and prevent the excessive swing of the sample, but the vertical movement of the sample cannot be restricted. The restriction device is adjusted so that the horizontal periphery of the test sample has a space of only about 10 mm (0.4 in).

Start the platform vibration with a frequency of about 2 Hz, increase the test frequency steadily, and repeat the test platform at some positions of the test sample. In order to ensure that the test sample is subjected to continuous repeated vibration, when the sample is jumped away from the test platform, a piece of 1.6 mm (1/26 in) thick and 50 mm wide (2.0 in) wide is used to insert the sample into the sample. Insert 100 mm (4.0 in and long), the spacers can be moved along the length of the bottom surface of a sample. Use a gasket that is long enough to ensure operator safety and care to keep the gasket flat on the test surface.

At this vibration frequency, continuous testing reaches the time required for the standard or a predetermined period or a predetermined number of lesions are observed to occur. Stop the test immediately and check for damage.

If the shipping container may be placed in other directions during transport, test at least one box for each possible direction.

Note: If the test cycle is not required, it is recommended to test for one hour.

Check the shipping container and the intrinsic product and record the damage or deterioration results that occurred during the test.

Method B - Resonance Test for a Single Shipping Box:

According to the sample, the normal transportation placement position is safely fixed on the test surface so that the required vibration conditions can be transmitted to the outside of the test sample. Place the accelerometer on top or bottom of the countertop as close as possible to the test sample (but make sure it won't be damaged by the sample), or a location that produces a table with representative data. Monitor the amplitude and frequency achieved by the table to ensure that the required conditions have been generated.

One of the methods can be used to determine the resonant frequency: sinusoidal sweep input or any input.

Resonance Search with Sinusoidal Sweep - Adjust the vibration test instrument to achieve the required constant acceleration amplitude (0 to peak) until the desired frequency range is reached. At a logarithmic ratio of 0.5 to 1.0 signal steps per minute, starting from the lowest frequency, sweep to the upper frequency limit and back to the lower frequency limit. Repeat this cycle twice to record the resonance response of the sample. These resonant frequencies can be monitored in different ways, including audible (audible response), visual (a stroboscopic or video system), or an accelerometer.

Note: The response frequency is different between the upper sweep limit and the lower sweep limit, and the actual response frequency of the test sample will be in the middle of the two frequencies (upper limit resonance frequency and lower limit resonance frequency).

Note: If the test accuracy is not required, an acceleration of 0.25g's to 0.5g's (2.45m/s2 to 4.9m/s2) amplitude (from 0 to peak), so that the frequency range reaches 3 to 100HZ, is enough stimulus to produce response.

Resonant search with any input - compared to sinusoidal sweeps, use any input to confirm that the product's resonant frequency is faster (synchronize the true frequency of the test sample with the wideband input). See test method D3580. To use this method, you need to install an accelerometer on the test sample to monitor the maximum response frequency. Accelerometers are also installed on the test bench to ensure that the motion of the table is the input spectrum of the required PSD. A sensor is placed in the direction of the vibration table to confirm the resonance frequency of the product.

The minimum frequency range is 3 to 100 Hz with a minimum power spectral density of 0.005 g2/Hz (0.049 (m/s2) 2/Hz) or a recognized appropriate frequency spectrum. Note that this range does not represent any particular real environment, but is merely used to confirm the natural frequency of the sample under the mandatory frequency range that often occurs during transportation. Start the vibration system and the PSD level should not exceed the required range during startup. Start the test at a minimum of 6 dB below the entire level, then slowly add one or more concurrent steps to reach the entire test range. Allowing the control system to be stable enough can be described to a stable spectral shape and level. Compare inputs and responses. Record the resonance response of the test sample.

Note: It is well known that some existing vibration testing equipment have a limited frequency range and additional equipment is required to meet the recommended frequency range requirements.

The required length of time (limited to the maximum of the four strongest resonance responses) is maintained for each resonant frequency measurement, or until the shipping container is damaged. Adjust the vibration frequency to maintain resonance if needed.

Note: If there is no time length requirement, it is generally kept for a minimum of 15 minutes.

Repeat the steps in the direction in which the sample may be placed during the simulation.

Check the shipping container and the intrinsic product and record the damage or deterioration results that occurred during the test.

Method C-stacking, resonance testing of composite or vertical stacking:

A test sample with a standard size composite or pallet stack is placed on the test bench and the stack height is equal to the actual height. It is best to test loads that are actually used for normal transportation, such as stretch film, strips, stacking structures, and so on. If vertical stacking is used during transportation, test the resonance of the freight box's individual vertical column loads. The additional limiting device leaves the test bench in a horizontal direction to prevent the sample from falling and excessively swinging. The restriction device is adjusted so that the horizontal periphery of the test sample has a space of only about 10 mm (0.4 in). Place the accelerometer on the test bench as close as possible to the test sample (but make sure it is not touched)

One of the methods can be used to determine the resonance point: sinusoidal sweep input or any input.

Resonance search with a sinusoidal sweep - adjusts the vibration test instrument to produce the required constant acceleration amplitude (0 to peak) until the desired frequency range is reached. At a logarithmic ratio of 0.5 to 1.0 signal steps per minute, starting from the lowest frequency, sweep to the upper frequency limit and back to the lower frequency limit. Repeat this cycle twice to record all the resonance responses of the sample. These resonant frequencies can be monitored in different ways, including auditory (audible response), visual (a stroboscopic or video system), or an accelerometer at the highest point of the sample stacking load.

Note: There are multiple single-load samples that will respond violently.

Note: The response frequency is different between the upper sweep limit and the lower sweep limit, and the actual frequency of the test sample will be in the middle of the two frequencies (upper limit resonance frequency and lower limit resonance frequency).

Note: If the test accuracy is not required, it is recommended to use an amplitude of 0.25g (2.5m/s 2) (from 0 to peak) to achieve a frequency range of 2 to 100HZ.

Resonant search with any input - compare with sinusoidal sweep, confirm the resonance frequency of the product with pallet stack, composite load or vertical stack load with any input (synchronize the test sample with the broadband input to synchronize all the realities) frequency). See test method D3580. To use this method, an accelerometer is required on top of the highest load of the test sample to monitor the maximum response frequency. This sensor should be placed outside the sample, relative to the resonance information of the internal independent package to capture the resonant frequency of the load, and the accelerometer should also be installed on the test bench to ensure that the motion of the table is the input spectrum of the required PSD. .

The minimum frequency range is 3 to 100 Hz with a minimum power spectral density of 0.005 g2/Hz (0.049 (m/s2) 2/Hz) or a recognized appropriate frequency spectrum. Note that this range does not represent any particular real environment, it is only used to confirm the natural frequency of stacking load samples under the mandatory frequency range that often occurs during transportation. Start the vibration system and the PSD level should not exceed the required range during startup. Start the test at a minimum of 6 dB below the entire level, then slowly add one or more concurrent steps to reach the entire test range. Allowing the control system to be stable enough can be described to a stable spectral shape and level. Compare inputs and responses. Record the resonance response of the test sample.

In the step, each time the resonance frequency is measured, the required length of time (limited to the maximum of the four strongest resonance responses) is maintained, or until the shipping container is damaged. Adjust the vibration frequency to maintain resonance if needed.

Note: If there is no time length requirement, it is generally kept for at least 15 minutes.

Check the shipping container and the intrinsic product and record the damage or deterioration results that occurred during the test.