Force Limited Vibration Testing Systems
Vibration overtesting occurs when an object under test is subjected to unrealistically severe and potentially damaging forces at its resonances. Due to the high cost, long development times, and uniqueness of sophisticated aerospace and other high-tech equipment, it is important to implement techniques that prevent vibration overtesting and ensure item safety during qualification. PCB Piezotronics'
Force Limited Testing Systems, available to rent from The Modal Shop, offer sensors that provide feedback to a closed loop control system of an existing shaker or slip table so that at frequencies where the measured force exceeds a safe limit, the controller's output signal (input signal to the shaker) is "notched" by reducing output amplitude. Thus, reaction force between the test fixture and structure is maintained within specified limits, keeping the force experienced by the object under test within realistic and safe levels.
