【摘要】 建立钢缆索索力传感理论模型,分析了施加在缆索材料上的力信号(外力和应变)与磁信号(磁感应强度、磁场强度)之间的耦合关系;提出一种改进的旁路励磁索力传感器,用磁导分析法对磁路做了详细的推导,结果表明可通过检测感应线圈的感应电压反映材料所受的外力;在缓变力情况下,传感器灵敏度与感应线圈的匝数、外激励磁化场及该磁化场下的材料磁导率有关。重点从激励磁化方式、参考工作点的选取、传感器的尺寸设计等三方面做了讨论,确定了传感器的参数。最后,利用万能拉力机对该种结构的传感器做了拉力模拟实验,传感器最大重复性误差为0.27%,实验结果与理论基本一致,表明所建立的索力传感器理论模型可行,对传感器的磁路计算、参数设计合理,可用于钢缆索的索力测量。更多还原

【Abstract】 Villari-effect theory and the model of cable tension sensor are presented.The relationships between mechanical parameters,such as stress and strain,and electromagnetic parameters,like magnetic field and magnetic induction,are discussed.A bypass excitation structure of cable tension sensor based on villari-effect is proposed and the magnetic circuit is deeply analyzed through calculating magnetic conductance.By measuring the inductive voltage in inductive windings,the cable tension stress may be measured.Sensor sensibility may be determined by inductive winding denseness,magnetic field and magnetic permeability if the stress changes slowly.Magnetization method,magnetic field intensity and sensor structure sizes are analyzed.An experimental system was developed and pulling tension experiment was carried out.The maximal repeating error of the cable tension sensor is 0.27%.Experiment results indicate that the sensor theoretical model and sensor structure are feasible and the sensor parameters are reasonable,which may be used for cable tension measurement.更多还原