Electromagnetic shakers and closed loop control systems are commonly used in qualification tests for environmental vibration conditions. However, shakers have resonances and anti-resonances at high frequencies. Resonances can be beneficial in that the shaker needs to exert less force to achieve the desired environment, but they can make it more challenging for the control system to match the desired environment. Anti-resonances are more problematic because they represent frequencies where the voltage input to the shaker causes little motion (at some locations on the slip table or adapter plate). Hence, these can cause the system to require driver voltage levels above the controller capacity and cause the test to abort and could even cause damage to the shaker. This paper proposes and characterizes a hybrid shaker system that uses piezoelectric actuator(s) in addition to the electromagnetic shaker to create a MIMO control system. It is hoped that the additional control effort introduced by the piezoelectric actuator can eliminate anti-resonances, expanding the frequency range over which the desired environment can be achieved. Furthermore, the actuators have very different capabilities as a function of frequency, and this is found to significantly reduce the control effort needed by the primary electromagnetic shaker.

电磁振动器和闭环控制系统通常用于环境振动条件的鉴定测试中。但是，振动器在高频下会产生共振和反共振。共振可能是有益的，因为振动器需要施加较少的力才能达到所需的环境，但是它们会使控制系统匹配所需的环境更具挑战性。反共振更成问题，因为它们表示输入振动台的电压几乎不引起运动的频率（在滑动台或转接板上的某些位置）。因此，这可能导致系统要求驱动器电压电平高于控制器容量，并导致测试中止，甚至可能损坏振动筛。本文提出并描述了一种混合振动台系统，该系统除了使用电磁振动台之外还使用压电致动器来创建MIMO控制系统。希望由压电致动器引入的附加控制作用可以消除反谐振，从而扩大可实现所需环境的频率范围。此外，执行器具有不同的功能，随频率变化，这被发现可以显着减少初级电磁振动台所需的控制工作量。