Application Cases

Experiment Title: Establishment of a Movable Center Rail Model for High-Speed Railway Turnouts

Testing Purpose:A three-dimensional solid model of the movable center rail for high-speed railway turnouts was established, and finite element meshing and simulation parameters were set. The influence of the web bolt holes and slide bed plate on the model during simulation calculations was investigated. After comprehensive consideration of the model, its correctness and reliability were verified through experiments.

Testing Equipment: ATA-2022B High Voltage Amplifier, Arbitrary Function Waveform Generator, Digital Oscilloscope, Piezoelectric Guided Wave Sensors, etc.

Experiment Process:

Figure 1: Composition and Main Equipment of the Experimental System

The composition and main equipment of the experimental system are shown in Figure 1. The arbitrary function waveform generator emits a modulated function voltage signal. The power high voltage amplifier amplifies the low voltage signal output from the arbitrary waveform generator into a high voltage signal and applies it to the transmitting sensor, which acts on the center rail. The digital oscilloscope displays and collects the signal emitted by the arbitrary waveform generator and the response signal transmitted by the receiving sensor, processes the initial signal, and stores it. The sensors have both transmitting and receiving functions.

In the experiment, a one-transmit-one-receive measurement scheme was used, with sensors placed on the bottom and top surfaces of the rail head of the long and short center rails. In the long center rail, the excitation point was set at 5726mm, and the receiving point was set at 3726mm. In the short center rail, the excitation point was set at 6244mm, and the receiving point was set at 4244mm (all distances are measured relative to the tip of the long center rail). The excitation used a ten-cycle 35kHz sine signal modulated by a Hanning window, with a sampling frequency of 2MHz.

Experimental Results:

Figure 2: Comparison of Time-Domain Results of Guided Wave Propagation in the Center Rail Between Simulation and Experiment

Figure 3: Comparison of Wavelet Transform Results of Guided Wave Propagation in the Center Rail Between Simulation and Experiment

The filtered experimental signals and the simulation results are shown in Figures 2 and 3. It can be seen that the experimental results match the simulation results well in terms of time-domain response. By using wavelet transform to convert the time-domain response to the time-frequency domain for analysis, it is evident that during the propagation of guided waves, the response energy in both simulation and experiment is concentrated around 35kHz, with a clear main frequency band. This indicates that the simulation model can effectively describe the propagation process of guided waves.

High Voltage Amplifier Recommendation: ATA-2022B

Figure: Specifications of the ATA-2022B High Voltage Amplifier

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