基于毫米波雷达的桥梁索杆振动检测及自动控制

在多因素耦合作用下桥梁结构会产生振动，以毫米波雷达技术为测量手段，提出桥梁索杆振动检测及自动控制方法。分析在恒载作用下桥梁索杆静止状态与振动状态的应变能，结合动能、势能和恒载做功等建立索杆平面内与平面外的振动特征描述方程。通过发送多周期连续毫米波雷达探测信号，取得同周期回波信号。根据回波信号与对应瞬时相位得到单频差拍信号及瞬时相位，检测出索杆振动幅值。利用半正定矩阵和正定矩阵等函数，建立令振动幅值达到最小值的桥梁索杆振动自动控制模型。实验结果表明，所提方法检测精准度较高，自动控制效果较好，并有效抑制了振动幅度，具备良好的应用性能。

Vibration Detection and Automatic Control of Bridge Cable Strut Based on Millimeter Wave Radar

The bridge structure will vibrate under the coupling action of multiple factors.Taking the millimeter wave radar technology as the measurement means , the vibration detection and automatic control method of bridge cable poles are proposed.The strain energy of static and vibration state of bridge cable pole under dead load is analyzed , and the vibration characteristic equations of cable pole in and out of plane are established in combination with kinetic energy , potential energy and dead load work.By sending multi period continuous millimeter wave radar detection signal , the same period echo signal is obtained.According to the echo signal and the corresponding instantaneous phase , the single frequency beat signal and instantaneous phase are obtained , and the vibration amplitude of the cable strut is detected.Using positive semi definite matrix , positive definite matrix and other functions , an automatic control model of bridge cable strut vibration is established to minimize the vibration amplitude.The experimental results show that the proposed method has high detection accuracy , good automatic control effect , and can effectively suppress the vibration amplitude , with good application performance.