The parameters uncertainty and external disturbance play a negative role to improve electro-hydraulic position servo system performance. The valve controlled cylinder system model is established, using the traditional PID control strategy and reaching law control strategy for simulating the system, respectively, the two methods have similar control effects in the ideal model, but considering the external disturbances, the index approaches sliding mode control law has better response speed and stability. Research shown that sliding mode control algorithm has an important role for improving the performance of hydraulic servo position control system.
Electric-hydraulic servo system is a nonlinear and uncertain system with time-varying parameters and interference. The fuzzy PID control algorithm is used,which not only keep the flexible characteristic of fuzzy control algorithm but also inherit the traditional PID control algorithm advantages of high control precision. Research shows that fuzzy PID control has the character of fast response speed, rising fast, small lag, small overshoot, anti-interference, do not depend on the accurate model.
For the complexity of power supply system design and calculation process in mine, a visual approach is presented.The integrated program with power mapping, analysis alculation and document management platform, the advanced visual programming technology, activex automation technology, object-oriented design methods are used with the secondary development using its built-in vba on the autocad platform.The entire system is divide into drawing and design calculation and output module with modular theory, the database is used as core for combining into a unified and organic whole by associating primitive objects and data. Studies show that the method can quickly and accurately complete the power supply design, it is important for power supply safety in mine.
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