Wheel-rail contact force monitoring enables the operational safety of high-speed trains and the quality management improvement of railway infrastructure.However,the available wheel-rail contact force measuring methods have difficulty in achieving precision and sensitivity for high-rotating wheels and real-time and continuous measurement of wheel-rail contact forces at high speed.In this work,a novel sensor for wheel-rail contact force monitoring is designed based on flexible electronic technology.A ring-shaped strain gage structure is designed on a flexible substrate,and the deformations of the annular region due to wheel-rail contact forces are detected according to the piezoresistive effect in the metal wire.The sensor is verified to have good linearity under vertical loading experiments and exhibits excellent stability and repeatability during cyclic loading.Furthermore,this sensor can guarantee measurement precision and sensitivity when the wheel is spinning.Additionally,the wheel-rail contact forces along the vertical and lateral directions are proved to be effectively decoupled by the output signals of the sensors conformal to relative positions on both sides of the wheel.Thus,combined with wireless sensing technology,the sensor developed here enables the real-time and continuous measurement of wheel-rail contact forces at high speed,which is of great importance for developing the next generation of high-speed railway intelligent transportation systems.
关键词
智能高铁/健康监测/轮轨力/柔性电子/传感器
Key words
intelligent transportation systems/structural health monitoring/wheel-rail contact force/flexible electronic technology/sensor
维普
万方数据