Research And Application Of Chassis Dynamometer System For Mining Tire Vehicle

Mining tire vehicles are the key equipment for coal mine auxiliary transportation,which is prone to cause safety accidents due to insufficient power during operation.Therefore,the dynamic testing of mining tire vehicle is an important link to ensure the safety of underground auxiliary transportation.However,the detection accuracy of the existing chassis dynamometer system for special vehicles such as mining tire vehicle cannot meet the safety requirements of coal mines.In order to solve this problem,this paper comprehensively uses the methods of theoretical analysis,numerical simulation and experiment to study the chassis dynamometer system for mining tire vehicle.Firstly,by analyzing the running resistance of the mining tire vehicle in the roadway and the chassis resistance of the chassis dynamometer system,the maximum output power of the mining tire vehicle chassis and the loading mathematical model of the chassis dynamometer system are obtained to complete the dynamometer selection.The research shows that compared with other dynamometers,the eddy current dynamometer is more in line with the detection requirements of the low-speed operating conditions of mining tire vehicle.After that,the mathematical model of power absorption of the eddy current dynamometer is established to complete the parameterized analysis.And use the COMSOL simulation software to carry on the electromagnetic simulation to the rotor disk of different materials of the eddy current dynamometer.Studies have shown that copper materials have a more significant effect on the critical speed of eddy current dynamometers than rotor disks made of steel and aluminum.Through theoretical analysis and experimental comparison,the design and selection of the main structure of the chassis dynamometer system for mining tire vehicle were completed.Secondly,the heat dissipation structure of the eddy current dynamometer is optimized,and the simulation model of the rotor disk is established.In the Fluent software,the heat dissipation characteristics of the rotor disk with different blade shapes and different blade numbers are numerically simulated by the heat flow coupling simulation method.The results show that the shape and number of blades have a significant effect on the rotor disk heat dissipation effect.At the same speed,compared with the original straight blade,the flow field performance of the involute blade is better,the speed of the airflow is greater,the amount of air generated is more,and the heat dissipation efficiency is improved by 13.46%.At the same time,increasing the number of blades and reducing the width of the blades within a certain range can improve the heat dissipation efficiency of the rotor disk.Then,complete the design of the control strategy of the chassis dynamometer system.Aiming at the problems of large rotational inertia and time-varying nonlinearity of the chassis dynamometer system,fuzzy control technology and PID are combined,and a complete set of fuzzy PID controller is designed according to actual requirements,which is simulated by Simulink software.The results show that the control strategy designed in this paper is 15% lower than the traditional PID control,and the output stabilization time is advanced by 5 s.It has good dynamic stability.Finally,the industrial application of the chassis dynamometer system for mining tire vehicle is completed.The on-site testing data shows that the chassis dynamometer system designed in this paper can better complete the testing of mining tire vehicle,and the application of control strategies is good,which meets the testing requirements of GB / T 18276-2017.