履带行驶结构的内置式无线应变采集卡设计研究OA北大核心CSTPCD

Aiming at the problem that it is difficult to obtain the track load of coal mine tracked tunneling robots during driving,a set of four-channel wireless strain acquisition card suitable for collecting dynamic characteristics of tracked traveling structure was designed based on the strain effect of resistive strain gauges and the measurement circuit.Firstly,the circuit and working principle of the strain acquisition card were analyzed.Then,two pairs of strain gauges were symmetrically arranged on the test template,and the strain data collected by DH5902N rugged data acquisition and analysis system was used as the standard to calibrate the sensitivity of four channels in the strain acquisition card through the combination of simulation and test.Finally,the strain acquisition card was integrated and packaged in the tracked traveling structure,and the temperature variation rule of the strain acquisition card under continuous operation in the package environment was discussed.The results showed that the designed strain acquisition card could collect the strain signal of four channels at the same time.Its maximum sampling frequency was 1 000 Hz,transmitting power was 4.5 dBm,and strain acquisition error was less than 5×10-6.The temperature of the strain acquisition card was stable at 34.58℃after 34.7 h continuous operation in the package environment,which could realize the multi-degree-of-freedom strain signal detection for the tracked traveling structure.The research results provide technical support for real-time acquisition of the dynamic load of tracked traveling structures and the reliability analysis and fault prediction of tunneling robots.