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As the near space atmospheric environment is complicated and variational, aircraft electric propulsion system parameters and load characteristics of the propeller will be changed, if the control method of electric propulsion system shall not be treated, the system stability and reliability will be affected. A novel double close loops control method with current and speed was presented in this paper,...
According to the basic structure of the aircraft landing gear, through the mechanical analysis, we established the mathematical model of the aircraft landing gear of semi-active damping system, and a linear interpolation method was applied in the fuzzy controller queries to adjust the PID parameters automatically. We have used the Matlab / Simulink control system simulation software for aircraft landing...
Temperature control in Variable Air Volume (VAV) air conditioning systems is a complicated process. Either the traditional Proportional Integral Derivative (PID) controller or the Fuzzy Logic Controller (FLC) is hard to get better control performance. The combination control system with fuzzy control and PID control can improve the control performance. Based on the conventional Fuzzy-PID (FPID) controller,...
Considering characteristics of aircrafts body, tyre, ground conditions and nose wheel steering system, the nonlinear dynamic model of the integrated ground directional control system which contains the rudder control system, the aircraft antiskid braking control system and the nose wheel steering control system is given, and a interpolation online fuzzy control is adopted in the nose wheel steering...
The vehicles air suspension system has highly the misalignment, the multi-degrees-of-freedom and time-variable and so on characteristics. There are many uncertain factors when it is controlled. The fuzzy control strategy does not need to establish controlled system's mathematical model, especially is suitable for the processing uncertainty, the misalignment, the time-dependent system. Usually as soon...
In order to make sure the seeding quality of air-suction seeding device, it is very important to control the vacuum degree of sowing drum. In this paper, the structure and principles of air-suction seeding device was introduced briefly and a fuzzy control system to control vacuum degree based on SPCE061A was presented. According to the features of SPCE061A and control demands of seeding device in...
Through analyzing the control effect of three different controllers, such as PID, fuzzy control and fuzzy-PID, it was proved that fuzzy-PID parameters self-tuning controller can make central air-conditioning system get well dynamic and steady performance, Simulation results showed that the fuzzy-PID method can restrain its time delay,high inertia and non-linearity. Using fuzzy-PID parameters self-tuning...
In this paper, a simulation model was built to study the CO2-based outdoor air rate control system in public buildings by PID control and fuzzy-PI control method. It is shown that classical PID algorithm can eliminates steady-state error, but the overtune is big and transitional time is long. The PID algorithm only suits for the case of CO2 concentration changed small. When the CO2 concentration has...
The performance of multi-split air conditioning system is very complex because of the interaction among different evaporators. An optimal control method and a two-stage fuzzy proportional integral derivative (FPID) controller for room temperature control are proposed. The salient feature of the two-stage FPID controller is that it has a simple structure and is easy to implement. The controllability...
Aiming at the non-linear links such as time lag, large inertia, in the heating, ventilating, and air conditioning (HVAC) system, a fuzzy immune self-tuning PID control system is designed. With ideas from the biological immune system, fuzzy immune PID control strategy is applied to central air-conditioning system, in which the proportional coefficient of PID is adaptively modulated by means of fuzzy...
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