“…Although passive control and/or semi-active control do not have a large power demand and offer high reliability at the expense of reducing control effectiveness, active control has still been a hot topic in recent years. In the past several years, great progress has been made in advancing the theory and practice of structural active control methods, such as classic control methods, including PID control [6], positive position feedback (PPF) [7], and velocity feedback control (VFC) [8], and modern control methods, including linear quadratic optimal control [9,10], H∞ theories [11,12], sliding mode control [13,14], and neural networks [15,16], which were developed to reduce building vibration under earthquake or wind excitation. However, when designing a controller for the active vibration control of structures, besides the control performance that must be considered, some practical issues should be considered in the controller design process as well [17].…”