With increasing transportation speed, the excessive vibrations of high-speed trains (HSTs) have become a critical issue to be solved. This study presents an innovative semiactive suspension system consisting of a magnetorheological (MR) damper in parallel with a magnetic negative stiffness (NS) element. The proposed semiactive dampers, called MRNS dampers, are integrated into the secondary suspension of an HST to improve riding comfort. The MRNS design can effectively enhance the vibration mitigation performance of semiactive MR dampers and compensate for the performance gap between traditional semiactive MR dampers and active controllers (e.g. linear quadratic regulator (LQR)). The effects of the NS coefficient and control force weight coefficient are presented, and the optimal selections of these parameters are discussed with respect to the control performance and force tracking errors of the MRNS controller. Results indicate that the MRNS damper can satisfactorily emulate LQR force trajectories. Hence, the semiactive MRNS controller can achieve vibration suppression performance comparable to that of an active LQR controller.

随着运输速度的提高，高速列车（HST）的过度振动已成为亟待解决的关键问题。本研究提出了一种创新的半主动悬架系统，该系统由磁流变 (MR) 阻尼器与磁性负刚度 (NS) 元件并联组成。提议的半主动阻尼器，称为 MRNS 阻尼器，被集成到 HST 的二级悬架中，以提高乘坐舒适性。MRNS设计可以有效提高半主动MR阻尼器的减振性能，弥补传统半主动MR阻尼器与主动控制器（如线性二次调节器（LQR））之间的性能差距。给出了 NS 系数和控制力权重系数的影响，并针对MRNS控制器的控制性能和力跟踪误差讨论了这些参数的最佳选择。结果表明，MRNS 阻尼器可以令人满意地模拟 LQR 力轨迹。因此，半主动式 MRNS 控制器可以实现与主动式 LQR 控制器相媲美的振动抑制性​​能。