论文部分内容阅读
针对桥梁被动支座因隔振耗能能力受限的问题,提出了结构参数可调的小尺度磁敏支座的设计及测试建模方法,利用相似关系结合有限元法建立了列车制动下全尺度桥的磁敏支座隔振系统模型,通过对顺桥向制动下桥梁隔振系统受到的冲击振动特征进行状态划分,以墩顶剪力与梁体位移为主要目标、兼顾梁体加速度指标,设计出列车制动作用下桥梁隔振系统缓冲减振的仿人自适应控制算法.用Maltab对列车制动下顺桥向隔振控制系统进行仿真计算.结果表明:列车不同制动停止位置对隔振系统的影响明显,在第三跨中制动停止时系统响应最为剧烈;采用仿人自适应控制的磁敏支座智能系统,使梁体位移最大值减少了53.9%,墩顶剪力峰值减少了34.4%,综合隔振率降低51.8%,缓解了被动支座难以同时降低力和位移响应的矛盾,提升了桥梁结构隔振耗能的能力.
Aiming at the problem that the passive support of bridge is limited due to the energy dissipation capability of vibration isolation, the design and test modeling method of small-scale magnetic bearing with adjustable structural parameters are proposed. The relationship between train brake Based on the model of vibration isolation system of full-scale bridge, the vibration and vibration characteristics of bridge vibration isolation system along the bridge to the bridge are divided into states, and the shear and beam displacement of the pier are the main goals, Acceleration index to design a humanoid adaptive control algorithm for damping vibration of bridge vibration isolation system under the action of train braking.Based on the Maltab simulation of the vibration isolation system along the train braking system, the results show that: The effect of stop position on the vibration isolation system is obvious, and the system response is the most severe when the brake is stopped in the third span. Using the intelligent system of humanoid adaptive control, the maximum displacement of the beam is reduced by 53.9% The peak value of the top shear force is reduced by 34.4% and the comprehensive vibration isolation rate is reduced by 51.8%. It alleviates the contradiction between the passive bearing and the force and displacement response, and improves the ability of vibration isolation and energy dissipation of the bridge structure.