用地震式低频振动传感器测量桥梁动挠度
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摘要
针对桥梁动挠度信号的特点及其对测试传感器频率特性的要求，分析动挠度的几种测试方法，从而提出采用地震式低频振动传感器测量桥梁动挠度。利用信号恢复技术，对地震式低频振动传感器国频率特性而畸变的输出作补偿处理，并讨论系统存在零点时的恢复技术，及噪声下恢复处理的不适定性。采用约束最小平方卷积反演技术获得在最小平方误差意义下对输入的最优估计，为动挠度信号的拾取提供了十分便捷有效的测试手段。
Aiming at the characteristic of bridge dynamic deflection signal, and the requirement for the frequency characteristic of measuring transducer, after reviewing several measuring methods, the authors put forward a convenient and effective method for measurement of bridge dynamic deflection with seismic low frequency vibration transducer. Signal recovery technique is adopted to compensate the output which is distorted because of the frequency characteristic of seismic transducer. Constrained least square deconvolution method is employed to acquire the optimum estimation for the real dynamic deflection in the presence of noise.
Aiming at the characteristic of bridge dynamic deflection signal, and the requirement for the frequency characteristic of measuring transducer, after reviewing several measuring methods, the authors put forward a convenient and effective method for measurement of bridge dynamic deflection with seismic low frequency vibration transducer. Signal recovery technique is adopted to compensate the output which is distorted because of the frequency characteristic of seismic transducer. Constrained least square deconvolution method is employed to acquire the optimum estimation for the real dynamic deflection in the presence of noise.
引文
1杨立志．智能化测量方法与低频绝对振动测量：［学位论文］．北京：清华大学精密仪器与机械学系，1992．52严普强，黄长艺．机械工程测试技术基础．北京：机械工业出版社，1985．38～393程乾生．信号数字处理的数学原理．北京：石油工业出版社．1985．385～3874舒勤，张有正．最小平方卷积反演的一种快速算法．电子学报，1991，19（4）；113～1155SchafterRW．Constrainediterativerestorationalgorithms．ProcIEEE，1981，69（4）：432－4506SarkerTK，etal．Deconvolutionofimpulseresponsefromtime－limitedinputandoutput：TheoryandexperimentIEEETrans，1985，IM－34（4）：541－546
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