Selection of frequency of electronic vibration test bench

In recent years, with the increasing proportion of vibration tests in all vibration tests in China, there are three reasons:

    1 , scientific progress, the popularization of software for such equipment, generally only need to add a set of control software and supporting equipment in the original electromagnetic vibration table can be implemented.

    2. With the extensive adoption of international standards, many vibration tests use random vibration.

    3. Random vibration has unparalleled advantages over conventional sinusoidal vibration. It can simulate vibration conditions that may be encountered under various actual transportation conditions, such as simulated road transport, simulated rail transport, and simulated maritime transport.

    So how should the frequency of the electronic vibration test bench be chosen? Frequency is another important parameter of random vibration, its unit is Hz , and the choice of frequency is generally related to the scope of practical use. For example: the frequency of seaborne test conditions is relatively low, generally from 1 to 100Hz , and low frequency PSD

With a large value, the random vibration feels like a seagoing vessel, with large amplitude and low frequency. The test conditions for railway transportation are 5~150Hz , which is also the low-frequency PSD . Random vibration gives people the same feeling of traveling on a train. Sometimes they feel very similar. High-frequency random vibration, generally high-frequency to 2000Hz , the noise is very harsh when vibrating, and feel like when the aircraft just took off or arrived at the destination, high-frequency vibration is generally used in aircraft transport or other places with high frequency occasions.

    For frequency, testers must pay attention to the highest frequency and lowest frequency. At high frequencies, some test benches may not meet the requirements and cannot be used. At the lowest frequencies, it is necessary to know whether the amplitude exceeds the maximum allowable value of the shaker table. If you do not pay attention, the table top may be damaged and the vibration test cannot be continued.