输电铁塔双轴加速度传感器优化布置

发布时间：2018-03-16 13:08

本文选题：传感器优化布置　切入点：双轴加速度传感器　出处：《仪器仪表学报》2017年09期 　论文类型：期刊论文

【摘要】：研究输电铁塔结构振动测量用双轴加速度传感器的优化布置问题。以三维模态置信准则(TMAC)为基础,提出一种新的考虑减小冗余度的二维模态置信准则法(RRBMAC法),以实现双轴加速度传感器优化布置,该方法基于改进的二维列主元QR分解获得传感器初始布点,再结合BMAC矩阵非对角元最大值和测点冗余度建立目标函数进行寻优。采用EFI2法和RRBMAC法对钢管塔进行传感器优化布置,采用两个水平方向的模态置信准则和最大奇异值比值对布点方案进行评价,结果显示两种方法的优化效果均首先随传感器数量增加而增强,而后趋于平稳,RRBMAC法较EFI2法能够获得更好的布置效果,且在传感器数目较少的情况下,RRBMAC法即表现出较好的优化能力。另外,采用EFI2法和RRBMAC法对一基格构式输电铁塔进行传感器优化布置,对比分析结果显示RRBMAC法能够获得较好的布置方案。采用优化的传感器布置方式对铁塔进行风振响应实测,并采用NEx T-ERA方法识别铁塔固有频率和阻尼系数,与模态分析结果对比显示NEx T-ERA方法能够提取得到较精确的频率结果。
[Abstract]:The optimal arrangement of biaxial accelerometers for structural vibration measurement of transmission towers is studied. Based on the three dimensional modal confidence criterion (TMAC), A new two-dimensional modal confidence criterion method, RRBMAC method, is proposed to optimize the layout of biaxial accelerometers. Based on the improved QR decomposition of two-dimensional column principal components, the initial sensor placement is obtained. Combined with the maximum value of non-diagonal element of BMAC matrix and the redundancy of measuring points, the objective function is established to optimize the sensor layout of steel pipe tower by EFI2 method and RRBMAC method. Two horizontal direction modal confidence criteria and the maximum singular value ratio are used to evaluate the placement scheme. The results show that the optimization results of the two methods first increase with the increase of the number of sensors. Then the RRBMAC method can obtain better arrangement effect than the EFI2 method, and the RRBMAC method shows better optimization ability when the number of sensors is small. The EFI2 and RRBMAC methods are used to optimize the sensor layout of a basic grid transmission tower. The results show that the RRBMAC method can obtain a better layout scheme. The wind vibration response of the tower is measured by the optimized sensor arrangement. The NEx T-ERA method is used to identify the natural frequency and damping coefficient of the tower. The comparison with the modal analysis results shows that the NEx T-ERA method can extract more accurate frequency results.
【作者单位】：华北电力大学机械工程系;河北省输变电设备安全防御重点实验室;
【基金】：中央高校基本科研业务专项基金(2015XS119)项目资助
【分类号】：TM75;TP212

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