Development Of Hydraulic System On Megawatt-level Wind Power Bearing Simulation Test Machine

In recent years,China’s wind power industry is in a state of rapid development. Wind power installed capacity is rising year after year, wind power bearing manufacturing quantity is also increasing, but the development of corresponding wind power bearing detection technology is slow, especially lack of simulating actual working conditions of machine. Although some enterprises have design and manufacture simulation testing machines, but the testing machines are more or less have some shortcomings, such as only suitable for low speed bearings test, difficult to accurately simulate the actual stress condition and cannot satisfy the high speed of the main bearing test, etc. Based on the above reasons, School of Mechanical Engineering of Dalian University of Technology with a wind power bearing enterprises jointly developed a detectable change pulp, yaw and main bearing simulation testing machine. The main research content of this article is the analysis and design of the simulation testing machine’s hydraulic system, a number of related work is completed in the process, I summarized it as follows:(1) The working principle of testing machine, testing machine’s hydraulic system are designed by modular design idea, the hydraulic system can be divided into loading part, turning part and bearing drive part; Apply theoretical calculation and combine with practical experience,testing machine hydraulic principle diagram is drawn, selectioncalculation are completed of the main components such as hydraulic pump, hydraulic valve and the auxiliary device of the hydraulic system; Hydraulic station are designed, the relevant drawings of the hydraulic pressure station are drawn; Tubing and pipe joint are selected, appropriate pipe laying scheme is made. Finally, checked the pressure loss and temperature rise of the designed hydraulic system.(2)Designed the control system of the hydraulic system and the processing system of the experimental data, the result show that omron PLC control system and Labview programming language design data processing system are adopted; The flow chart of each module of the hydraulic system are drawn, these provide design resources for control system; Appropriate sensor was chosen to measure requirement test parameters, the PID control was adopted to load loop pressure and adjust the speed of the bearing; The design can easily display data processing system of the various testing data, full automatic operation are realized by PLC which is controlled by Labview. (3) A certain type of bearing test was finished, various parameters specific numerical values and graphs which are required were obtained, such as load, speed, temperature, displacement, and torque, and analyzed the test data, determine whether there are some problem of the hydraulic system based on test results and propose improvement program.The wind power bearing simulation testing machine by the hydraulic system which is designed by this topic is now come into use in a domestic large-scale wind power bearing processing and manufacturing enterprise, it has successfully completed the three wind power bearing experiment, we accurately simulate the actual working condition and acquire various data which are needed for wind power bearing’s test, measurement result is unanimously recognized by this enterprise and bearing buyer, this provide a series of visible data for manufacture, installation, debugging, measuring and sales of wind power bearing manufacture for this business, all of these have very important practical significance.