基于有效独立-总位移法的水工结构振测传感器优化布置

Optimal sensor placement for hydraulic structures based on effective independence-total displacement method

为了更好地解决大型水工结构振测传感器优化布置问题,以拉西瓦拱坝为研究对象,针对有效独立法所选测点能量较小的不足,提出基于有效独立-总位移法的传感器优化布置方法。运用模态保证准则、最大奇异值比、Fisher信息矩阵值和总位移幅值等评价方法对有效独立法、有效独立-总位移法和距离系数-有效独立法三种方法进行评价。研究表明,有效独立-总位移法可以使所测得的模态之间正交性、可观性更好,提高剩余测点的应变能,是一种有效实用的传感器优化布置方法。

In order to solve the problem of large hydraulic structure sensor optimization better, the Laxiwa arch dam was considered as the research subject. In view of the shortcomings of the effective independence method for getting the points with less energy, the effective independence-total displacement method was proposed. Modal assurance criterion, maximum singular-value ratio, Fisher information matrix and total displacement were used to evaluate the sensor optimization effect with an effective independence method, effective independence-total displacement method and distance coefficient-effective independence method. This study shows that the proposed effective independence-total displacement method can improve the independence and observability of the measured modes, and can improve the strain energy of the remaining points, so it is an effective and practical method for optimal sensor placement.