Vibration test is to evaluate the resistance of components, parts and whole machines in the expected transportation and use environment. However, the purpose of vibration test is to make a series of controllable vibration simulations during the test to test whether the product is in the life cycle. It can withstand the test of transportation or vibration environmental factors, and can also determine the required standards for product design and function. According to statistics, improving the design level by 3% will increase the recycling by 20% and reduce the unnecessary expenditure by 18%.
Vibration simulation also has different methods according to different purposes, such as resonance search, resonance dwell, cyclic scanning, random vibration and stress screening, etc. The effect meter of vibration includes:
1. The strength of the structure.
2. Release of the conjugate.
3. Wear protection of materials.
4. Damage to components.
5. Poor contact of electronic components.
6. The circuit is short-circuited and intermittently unstable.
7. The standard value of each piece is offset.
8. Screen out defective parts in advance.
9. Find the resonance relationship between parts, structure, packaging and transportation process, and improve its resonance factors.
As for the vibration test procedure, it is necessary to evaluate and determine the test specifications, the authenticity of the fixture design, the functional inspection during the test process, and the evaluation, review and suggestion of the final test piece. The point of vibration testing is to confirm the reliability of the product, to screen out the defective products in advance before leaving the factory, and to evaluate the failure analysis of the defective products in order to become a high-level, high-reliability product.
Commonly used vibration modes can be divided into two types: sinusoidal vibration and random vibration:
I. Sinusoidal vibration is a test method often used in the test room to simulate the vibration generated by rotation, pulsation, and vibration (occurring on ships, aircraft, vehicles, and space vehicles), as well as product structure resonance frequency analysis and resonance point standing. It is mainly divided into two types: sweep frequency vibration and fixed frequency vibration. The severity depends on the frequency range, amplitude value, and test duration.
II. Random vibration is used to simulate the overall structural seismic strength evaluation of the product and the transportation environment in the packaged state. The severity depends on the frequency range, GRMS, test duration and axial direction.
Vibration tests are divided into the following categories:
·Sinusoidal fixed frequency test Perform a sinusoidal vibration test at a selected frequency (can be a resonance frequency, a specific frequency, or a dangerous frequency) according to the specified value, and achieve the specified time.
·Sine frequency sweep test In the specified frequency range, according to the specified value and at a certain sweep rate from low frequency to high frequency, and then from high frequency to low frequency as a frequency sweep, until the specified total number of times is reached.
·Narrow-band random scan test In the specified frequency range, a narrow-band random signal with a certain bandwidth at a certain center frequency is used to scan from low frequency to high frequency, and then from high frequency to low frequency, and the specified time is reached.
·Broadband random vibration test In the specified frequency range, perform broadband random vibration according to the specified spectral shape and total root mean square value (GRMS), and meet the specified time.
·Broadband random superimposed sinusoidal vibration test In the specified frequency range, on the basis of random vibration, sinusoidal vibration of several frequencies is superimposed, and the test is completed according to the specified magnitude and time.
·Broadband random superposition and narrowband random sweep vibration test In the specified frequency range, there are several narrowband random peaks superimposed on the basis of broadband random vibration, and the test is completed according to the specified magnitude and time.
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