Guide and Handbook for Electrodynamic Shakers
Electrodynamic Shakers
Vibration testing is performed for a variety of reasons: to determine if a product can withstand the rigors of its intended use environment, to insure the final design will not fall apart during shipping,for Environmental Stress Screening to weed out production defects, or even as a form of Accelerated Stress Testing. Vibration tests are commonly used to improve the reliability of military hardware, avionics instrumentation, consumer electronics, automotive components, and telecommunications gear.
Electrodynamic vibration systems are capable of performing many different tests that specify sine, random, shock, sine-on-random,random-on-random and other complex waveforms as well as replicating data that is collected from real world conditions.Breaking the electrodynamic vibration system down into its dis crete components, we are quite simply left with something analogous to a stereo system – a big and powerful, industrial strength stereo system. Using a vibration control system (synonymous with the CD player), a signal is sent
through an amplifier (similar to the amplifier used for a home stereo), to the shaker (something like a speaker, but made mostly out of steel and weighing several tons), where the armature (comparable to the stereo speaker’s woofer or voice coil) moves up & down or back & forth in a magnetic field. An added element to the vibration system is an accelerometer that senses the output of the shaker and sends this signal back to the controller for fine tuning. The controller in turn sends a drive signal back to the amplifier which provides accurate, closed-loop control and spectral shaping of the test being performed. This resource presents fundamental concepts and the basic element that comprise an electrodynamic vibration system.
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