When natural disasters occur, real-time disaster relief operations need to be implemented. But if disaster relief transportation is interrupted, these operations will be severely hampered. Emergency relief bridges must be erected so that people, materials and machinery can reach the disaster area smoothly. Therefore, one indispensable tool of disaster relief organizations is the light bridge. The design of such a lightweight bridge is controlled by deformation, not strength, so the span of the bridge is limited. Thus, this study proposes a bridge with multiple NEMs acting as multiple virtual piers of the bridge and an active structural control method was adopted to expand the span of the light bridge. The experimental results showed that, for the maximum vertical displacements at 1/3 and 2/3 distances from the left side of the bridge under uncontrolled and controlled conditions, the displacement reduction rates of the bridge were 96.20% and 98.42% for the outbound trip and 93.32% and 98.47% for the return trip, respectively. For the displacement control at the midpoint of the bridge under uncontrolled and controlled conditions, the displacement reduction rates of the outbound and return trips were 96.77% and 96.62%, respectively. The images from the experiment also showed that the cantilever arm of each NEM could be rotated by the PID controller to the appropriate angle to provide sufficient upward force to balance the vertical displacement changes based on the position of the moving load. Thus, zero-displacement control of a bridge can be achieved, and the control effect is quite significant.

当自然灾害发生时，需要实施实时救灾行动。但是，如果disaster灾运输被中断，这些行动将受到严重阻碍。必须架设紧急救援桥，以便人员，物资和机械能够顺利到达灾区。因此，救灾机构不可或缺的工具就是光桥。这种轻质桥梁的设计是通过变形而不是强度来控制的，因此桥梁的跨度受到限制。因此，本研究提出了一种具有多个NEM的桥梁，作为桥梁的多个虚拟墩，并采用主动结构控制方法来扩展轻型桥梁的跨度。实验结果表明，在不受控制和受控的条件下，距桥梁左侧1/3和2/3处的最大垂直位移，出境旅行的桥梁位移减小率分别为96.20％和98.42％，93.32％和98.47％分别为回程。对于不受控制和受控条件下桥梁中点的位移控制，出站和回程的位移减小率分别为96.77％和96.62％。实验图像还显示，每个NEM的悬臂均可通过PID控制器旋转到适当的角度，以提供足够的向上力来平衡基于移动负载位置的垂直位移变化。因此，可以实现桥梁的零位移控制，