Conventional skyhook-based ON–OFF control switches the damping force on a vibration suppression target according to the sign of the product of the target and relative velocities (which is called the condition function). Here, we propose a control strategy that uses a novel condition function for improved performance. The proposed strategy is formulated based on the theory of forced vibration with base excitation. Its effect upon semi-active vibration performance is investigated via numerical simulations and experimental tests of the vibration suppression of a small structure equipped with a magnetorheological (MR) damper. In the simulations, the proposed control strategy can offer high-performance semi-active vibration suppression, even in the presence of force delays in the damper. The experiments show that the displacement response with the proposed control is lower than that with the conventional skyhook-based control over the entire frequency range; furthermore, the desired performance can be achieved when the proposed condition function is used with velocity-proportional control. The simplicity and high performance demonstrated by the proposed control strategy make it applicable to semi-active vibration suppression of practical systems, even in the presence of unavoidable force delays in controllable dampers.

传统的基于天棚的 ON-OFF 控制根据目标与相对速度的乘积的符号（称为条件函数）来切换振动抑制目标上的阻尼力。在这里，我们提出了一种控制策略，该策略使用新颖的条件函数来提高性能。所提出的策略是基于具有基础激励的强制振动理论制定的。通过对配备磁流变 (MR) 阻尼器的小型结构的振动抑制进行数值模拟和实验测试，研究了其对半主动振动性能的影响。在仿真中，即使在阻尼器中存在力延迟的情况下，所提出的控制策略也可以提供高性能的半主动振动抑制。实验表明，在整个频率范围内，所提出的控制的位移响应低于传统的基于天棚的控制；此外，当建议的条件函数与速度比例控制一起使用时，可以实现所需的性能。所提出的控制策略所展示的简单性和高性能使其适用于实际系统的半主动振动抑制，即使在可控阻尼器中存在不可避免的力延迟的情况下也是如此。