Research On Key Technologies Of Steady Arms Monitoring Module Based On NB-IoT Communication Technology

The steady arms on the railway catenary is an important part in the registration device.If the steady arms breaks,it will affect the normal operation of the pantograph-catenary system.In severe cases,the contact wire and the pantograph may be wound to cause damage to the pantograph,which will seriously affect The train runs safely.At present,there is no mature technical means to continuously detect and monitor the working conditions of the steady arms.Due to the complex electromagnetic environment of the steady arms,some conventional sensors cannot be directly installed and used,and the coverage area is small and the communication is susceptible to interference.In order to reflect the working state of the steady arms and detect some gradual defect states,it is necessary to monitor the key parameters of the part of the steady arms in real time.This paper proposes on-line monitoring of steady arms status based on NB-IoT(Narrowband Internet of Things)combined with embedded chip.The detection includes the detection of the inclination of the steady arms and the amount of lift caused by the vibration.According to the inclination and vibration changes of the monitoring steady arms,the working state of the steady arms can be analyzed in real time.The detection of the inclination and vibration of the steady arms relies on the steady arm monitoring module based on theinertial sensing unit,and uses the NB-IoT wireless communication technology to build a steady arm detector detection sensor network to realize real-time monitoring of the steady arms throughout the day.The main body of this paper is divided into the following parts:1)Using the MEMS inertial measurement unit,the accelerometer detects the motion state of the steady arm in the vertical direction,the gyroscope detects the angular position change of the steady arms,and compensates the offset of the gyroscope by using the quaternion and the complementary filtering algorithm for posture fusion.The error improves the accuracy and reliability of the position change detection value of the steady arms.Combined with the measured value of the inclination of the steady arms,the change of the lift amount of the steady arms of the steady arms is measured by a mathematical model.2)According to the wide distribution and large span of the steady arms of the railway,the NB-IoT communication technology is used to construct the sensor network and construct the uplink and downlink communication channel without affecting the limitation of the professional communication channel of the high-speed rail communication.Moreover,by utilizing the low power consumption characteristics of the IoT communication chip,the size control of the entire steady arms monitoring module in the engineering implementation does not increase the load on the steady arms itself.3)For the communication and debugging of the software and hardware modules in the locator monitoring module,the test results verify the detection results under laboratory conditions.The average power consumption of the positioner monitoring module in different states was measured.It is verified that the module has low power consumption characteristics to ensure the practicability and universality in engineering applications.