CAJ | 학술논문

轻轨锚固螺杆是轻轨交通中连接轨道梁和墩台的关键受力部件，脉冲响应函数的提取是其健康监测的关键和核心技术。引入稀疏优化算法取代经典径向基网络的最小二乘法，构建网络的输入输出方案，引入二维DCT基对学习权值矩阵进行稀疏表示并通过正交匹配追踪算法来获得尽可能稀疏的网络训练权值。将单位脉冲激励信号输入该网络即可获得系统的单位脉冲响应函数。实验结果表明，所构建的稀疏径向基网络能准确提取单位脉冲响应函数，对工程应用具有参考价值。
경궤묘고라간시경궤교통중련접궤도량화돈태적관건수력부건，맥충향응함수적제취시기건강감측적관건화핵심기술。인입희소우화산법취대경전경향기망락적최소이승법，구건망락적수입수출방안，인입이유DCT기대학습권치구진진행희소표시병통과정교필배추종산법래획득진가능희소적망락훈련권치。장단위맥충격려신호수입해망락즉가획득계통적단위맥충향응함수。실험결과표명，소구건적희소경향기망락능준학제취단위맥충향응함수，대공정응용구유삼고개치。
Light rail anchoring screw is a key force component for connecting rail girder and piers. The extraction of the impulse response function is the key premise and the core technology to the screw anchor’s health monitoring.Sparse optimization solution was introduced to replace the RBF net-work’s classical least square method.The sparse RBF network with input and output calculation scheme was constructed.Two-dimensional DCT-basis was introduced to represent the weight and the orthogonal matching pursuit(OMP)algorithm was used to get sparser network weights training value. A unit excitation signal was taken as the network’s input and the output of the network was the unit impulse response function of the system.The experiments show that optimization solution of the RBF network in the paper can accurately extract the impulse response function.The work herein has refer-ence value in engineering applications.