High-speed Sweep Power Rail-based Monitoring System Integration

As the freight train drives faster, the overload and unbalanced load become the main factor of the accident that the freight train derailed and turned over. In order to reduce the frequency of these accidents, monitoring the overload and unbalanced load of the freight train become the main mean for the railway department to regulate the railway transportation especially when the freight train drives at a high speed.In the early monitoring process of the overload and unbalanced load, a downward tendency was found when comparing the real monitoring value of the wheel load with the static one as the speed of the freight train became higher. In order to find the law that how the speed factor effects the steady wheel load, the group designed a high-speed ejecting test-bed for monitoring the wheel-scan force based on some simulation analysis and determined to move the research field gradually from the overload monitoring of single wheel interacting single rail to real circumstances.After manufacturing and debugging of the high-speed ejecting test-bed, an efficient monitoring system still needed to acquire the speed and the steady load of the wheel. This paper focuses on the monitoring requirements of the test-bed and real circumstances, and analyzes how the speed factor impacts the steady value of the wheel as purpose. Development process of the rail-based monitoring system is introduced in detail, and some experiments are made. The major research contents of the paper are summarized as follows:1. The test-bed and real monitoring circumstances are set as the monitoring objects. The requirement analysis is made for the rail-based monitoring system. And plans are made for both upper and lower monitor.2. In order to acquire the accurate speed and steady wheel load value, the hardware's quick response of the lower monitor is fully taken as an advantage. A lower computer for data acquisition is built based on a DSP2812 user board ICETEK-F2812-A, and it is used to fulfill the tasks like signal conditioning, AD conversion of multi-channel wheel load signal, speed measurement for the rolling wheel, data packing, data buffering, and serial transportation.3. A host software processing platform is designed to process the samples and speed value that upload from the lower module. First it unpacks the data package, and then make the division, HHT transformation and saving operations for the multi-channel samples. The software processing platform is given the function that the user can query and compare the historical samples, and least square method is introduced to find the law between the steady wheel load and the speed factor.