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为了满足MW级风机叶片静力加载试验的要求,改变国内普遍采用的半自动加载模式,设计了一套基于CAN总线的分布式多节点液压静力加载试验台。叶片在静力加载过程中弯曲极大且不规则,采用液压绞车作为牵引力输出设备,并分析了加载过程中的变牵引特性;为了提高加载过程中的牵引力精度及跟随性能,采用“V—F”的控制模式,通过比例调速阀的开口度来满足各加载节点的输出牵引力;将加载过程分成几个阶段,并采用限幅变比例积分分离控制算法,增强了系统的自适应能力。试验证明,该试验台使风机叶片静力加载试验的自动化程度大大提高,各节点在加载过程中具有良好的协调性能,牵引力误差小于±2 kN,完全满足叶片静力加载试验的要求。
In order to meet the requirements of static load test of MW fan blades and to change the semi-automatic loading mode commonly used in China, a distributed multi-node hydrostatic loading test rig based on CAN bus was designed. In the process of static loading, the blades are extremely bended and irregular. The hydraulic winch is used as the traction output device, and the variable traction characteristic during the loading process is analyzed. In order to improve the traction precision and follow-up performance during loading, the “V- F ”control mode to meet the output traction of each loading node through the opening degree of the proportional control valve; the loading process is divided into several stages and the limiting variable proportional integral separation control algorithm is used to enhance the system’s adaptive ability . The test proves that this test bench greatly enhances the automation of the fan blade static loading test. The nodes have good coordination performance during loading and the traction error is less than ± 2 kN, which fully meets the requirements of the static loading test of the blades.