| Gearbox, as an important component of mechanical equipment, has been widely used in areas such as aviation, ships, vehicles and wind power. And its performance has a great influence on the stability and reliability of the whole system. Therefore, gearbox test becomes especially important. The topic is aimed at researching and designing a test platform system for gearbox which can implement quick load of speed and torque, and automated real-time detection of experimental parameters during gearbox load test. And it can ensure higher control and detection accuracy.First of all,the paper had a study of common structure and the related technology with the design of gear device test platform. And it proposed a system's design scheme in electric power closed according to the functional requirements and design indexes. The whole system mainly consists of three function modules and they are drag control module, system monitor module and CAN information transmission module. The drag control module is responsible for the given of drive and simulative load during gearbox load test. On the one hand, system monitor module has an effectively control of system units; on the other hand, it is responsible for the test data collection, storage, display and analysis in the process of gearbox load test.And CAN information transmission module is responsible for information interaction between drag control module and system monitor module.Then, the modeling and analysis for drag module was carried out and a design method for drag control system was given based on vector control and SVPWM. Speed regulation capability with load for three-phase asynchronous motor was studied and an improved design method in voltage closed-loop for weak magnetic controller was given. To achieve high performance of AC speed regulation with the drive module in the full range,it had a design of power-input motor's speed loop controller using the compound control method. And in order to verify the effectiveness of the proposed control strategy, the digital simulation model was built using MATLAB and the function simulation for drag control system was carried out.The simulation results show the proposed design method for drag control system can satisfy the system's function requirement and the compound control method compared with traditional control can obtain better control effect, such as faster speed response, smaller overshoot, higher steady accuracy and stronger loading-speed regulation capacity.Next, In view of the system's information transmission problems,it had a research for CAN bus technology in the application of gearbox test platform system, and a kind of design method for CAN bus application layer applied for gearbox test platform system was given.The design work for main hardware and related program of system was completed based on the DSP chip TMS320F28335. And, the computer monitor software was developed to realize real-time monitoring, process data handling and system setup and control by using virtual instrument software LabWindows/CVI.Finally, the functional verification for the proposed design scheme' hardware and software part with gearbox test platform system was carried out by using existing resources of laboratory. The functional verification includes CAN information transmission function verification, sensor data acquisition function verification and drag control function verification. The results prove that the proposed design scheme for gearbox test platform system is feasible and owns very good reference value for engineering designers. |
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