Knowledge
22/03/2024
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The minimum frequency for a sinusoidal vibration test is 0.1 Hz according to the test specification for electrical and electronic products. However, the minimum operating frequency in tests such as earthquake simulation, wave simulation and road transport simulation may be lower than 0.1Hz, so the implementation of ultra-low frequency sinusoidal vibration testing is a special problem in sinusoidal vibration testing and requires special discussion.
The electrodynamic shaker is an extremely widely used vibration test equipment in vibration testing, and its force ranges from hundreds of Newtons to thousands of Newtons. In practical applications, due to improper use, it often brings unexpected damage to the vibration table
Usually, when a fixture is designed with only static loads in mind, a very severe major resonance occurs within the frequency range of the test. The clamping and bolting arrangement, while adequate statically, turns out to be very soft or compliant when analyzed dynamically. In other words, the mass of the test item and fixture is resonant on the soft springs consisting of the clamping arrangement to the shaker table. There are at least two major objections to this resonant condition.
The requirements for random vibration testing are defined by the frequency-acceleration power spectral density (PSD for short) curve and its tolerance range. Therefore, in addition to meeting the basic requirements of a sinusoidal vibration shaker, a random vibration shaker has several specific technical specifications.
The large shock force generated by the impact comes from the change in momentum (mv) of the object in motion with the object being struck (e.g., hard ground) at the moment of very short contact (Δt),
The year 2021 is coming to an end. In order to thank the whole team for working together this year, Labtone organized a 2-day trip to Conghua, Guangzhou.
In environmental and reliability testing, there are some shaking tables used for comprehensive environmental testing, and the requirements for shaking tables are different according to the factors of comprehensive environment.
Many products are subjected to vibration tests in three mutually perpendicular directions of x, y, and z. Small test pieces can be used to change the fixture installation state and use the fixture to flip to achieve three directions of vibration on the vertical vibration table. For large specimens, using the fixture flip method may cause excessive eccentric torque, and the vibration test of some special products (such as gyroscopes, etc.) requires that the installation state of the main shaft and the relative position of the earth remain unchanged, and it is not possible to change the fixture.
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