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Adaptive Fuzzy Control of Quadrotor

Adaptive Fuzzy Control of Quadrotor

In this thesis, intelligent controllers are designed to control attitude for quadrotor UAV (Unmanned Aerial Vehicle).Quadrotors have a variety of applications in real time e.g. surveillance, inspection, search, rescue and reducing the human force in undesirable conditions. Quadrotors are generally unstable systems; the kinematics of quadrotor resembles the kinematics of inverted pendulum. In order to avoid the possibility of any kind of damages, the mathematical model of quadrotor should be developed and after that, the different control techniques can be implemented. This thesis presents a detailed simulation model for a Quadrotor. For the control purpose, three classical and modern control strategies are separately implemented which are PID, Fuzzy, and Adaptive Fuzzy PID for four basic motions roll, pitch, yaw, and Z/ Height. For better performance, error reduction and easy tuning, this thesis introduces individual controllers for all basic motion of a Quadrotor. The modeling and control is done using MATLAB/Simulink. The main objective of this thesis is to get the desired output with respect to the desired the input. At the end, simulation results are compared to check which controller acts the best for the developed Quadrotor model
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Fuzzy adaptive parameter control of a late acceptance hyper heuristic

Fuzzy adaptive parameter control of a late acceptance hyper heuristic

The results summarised in Table II show that this initial fuzzy system was able to significantly improve over the best fixed length hyper-heuristic for two instances. Being an initial, un-tuned fuzzy system to illustrate the potential of parameter control using fuzzy systems in hyper-heuristic’s, the fuzzy system also performed insignificantly better, insignif- icantly worse, and significantly worse for three, four, and three instances respectively. Overall, the fuzzy controlled late- acceptance hyper-heuristic was able to perform better for five of the twelve instances. As well as being able to make some improvements over LAHH, the objective function values of the best runs in Table III show that it is able to improve over AdapHH, although median results show that while improving for one instance of the competition, it performed worse for two others, albeit for one of these, it managed to obtain a better best solution than AdapHH. In the CHeSC competition, hyper- heuristics were awarded scores based on their median perfor- mances for each problem instance of each problem domain
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An Adaptive Fuzzy Sliding Mode Control Scheme for Robotic Systems

An Adaptive Fuzzy Sliding Mode Control Scheme for Robotic Systems

Performance of many tracking control systems is limited by variation of parameters and disturbances. This specially applies for direct drive robots with highly nonlinear dy- namics and model uncertainties. Payload changes and/or its exact position in the end effector are examples of uncer- tainties. The control methodologies that can be used are ranging from classical adaptive control and robust control to the new methods that usually combine good properties of the classical control schemes to fuzzy [1,2], genetic al- gorithms [3], neuro-fuzzy [4,5] and neural network [6] based approaches. Classical adaptive control of manipula- tors requires a precise mathematical model of the system’s dynamics and the property of linear parameterization of the system’s uncertain physical parameters [7].
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Fuzzy adaptive parameter control of a late acceptance hyper heuristic

Fuzzy adaptive parameter control of a late acceptance hyper heuristic

The fuzzy system is comprised of 15 rules (Table I). A rule is defined by three variables C, F, N which relate to the fuzzy sets CAL, NFD, and NAL respectively. The rules are defined as IF (CAL = C) AND (NFD = F ) THEN (NAL = N ). When defining the rules of the system, the effects of different list lengths for late acceptance were considered along with what should happen if the search beings to stagnate. A higher value of L causes the search to take longer to converge while a smaller value of L will cause the search to stagnate very quickly. It has previously been shown that a longer convergence time will eventually lead to a better quality solution. Setting this parameter to a high value then would appear to be the best solution however there are other problems concerning the execution time of the hyper-heuristic and the total number of iterations. If the parameter is set too high, then the search would degrade into a random walk with a threshold value equal to the initial solution’s objective value. At any given point of the search, the optimal value of this parameter is then uncertain as to what we should assign it and needs to be controlled.
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Adaptive Fuzzy Type-2 in Control of 2-DOF Helicopter

Adaptive Fuzzy Type-2 in Control of 2-DOF Helicopter

Although the difficulties in both understanding and design of the type-2 logic systems comparing to other controllers, the first stays still as a preferred research area in the recent years, due to its robustness through the uncertainties and disturbances. In this sense, PID controller, which is highly sensitive to perturbations and uncertainties, has a drawback and it may cause a performance degradation. In the meanwhile, applied on the same class of systems as described previously, the PID and fuzzy control have higher tracking errors, especially when disturbances arise. In this study, the proposed designed controllers successfully designed several controllers for trajectory tracking control of TRMS model on MATLAB/Simulink, among these designed controllers, an interval type-2 fuzzy logic system is presented. According to the results, type-2 fuzzy logic controller produce better results than the PID and fuzzy type-1 controller in terms of tracking precision in the presence of the disturbances.
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Analysis of Fuzzy Control of Dynamic Loads with Adaptive Power System

Analysis of Fuzzy Control of Dynamic Loads with Adaptive Power System

The consolidated three-stage crest control swell as observed by the shipboard generator(s) at any single recurrence created by the heap should be not as much as the cutoff points characterized by Figure 3. The subsequent permitted stack profile proposed in Figure 3 has been coordinated to the generator and prime mover execution. Run of the mill gensets' reaction times to a critical load change are on the request of 1.0 to 1.5 sec [15], [16]. In the event that the ascent and fall times for control changes (incline rate) seen by the generator are controlled to be slower than the genset's reaction times, the generator and prime-mover control circles will have the capacity to keep up the voltage and speed direction, transport aggravations will be kept to a base for such a moderate changing force profile, and sub-synchronous resonances won't be energized in light of the fact that the unsettling influences are at bring down frequencies.
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Adaptive Fuzzy Dynamic Sliding Mode Control of Nonlinear Systems

Adaptive Fuzzy Dynamic Sliding Mode Control of Nonlinear Systems

The invariance property is the motivation of researchers in use of SMC for various applications [4-7] especially is precise systems [8]. The greatest shortcoming of SMC is chattering, the high (but finite) frequency oscillations with small amplitude that produce heat losses in electrical power circuits and wear mechanical parts [3]. Chattering is often due to the excitation of high frequency un-modeled (ignored) dynamics (sensors, actuators and plant) [9]. Excitation of these dynamics is due to two causes: high controller gain and high frequency switching of input control signal [9].
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Pitch Control of Wind Turbine through PID, Fuzzy and an Adaptive Fuzzy PID Controller

Pitch Control of Wind Turbine through PID, Fuzzy and an Adaptive Fuzzy PID Controller

[4]. Han, Bing, Lawu Zhou, Fan Yang, and Zeng Xiang. "Individual Pitch Controller Based on Fuzzy Logic Control for Wind Turbine Load Mitigation." IET Renewable Power Generation 10.5 (2016): 687-93. Kozak, Peter. "Blade Pitch Optimization Methods for Vertical-axis Wind Turbines." Thesis. ProQuest Dissertations Publishing, n.d. 2016. [5] Jason T Brown. Montana environmental information centre. http://meic.org, 2013.

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The application of Self-adaptive Fuzzy PID control the evaporator superheat

The application of Self-adaptive Fuzzy PID control the evaporator superheat

sampling period, K  is the Proportion coefficient, T i is the integral time, and T d is the differential time. Their effects are as follows: (1) The proportion: according to the deviation, the controller adapts the controlled quantity based on the proportion, to reduce the deviation. Proportion coefficient is used to speed up the system response speed, the greater the proportion coefficient, the faster the coefficient of response. If the proportion coefficient is too big, it may cause overshoot, bring oscillation to the system. The smaller the proportion coefficient, the longer time the system takes to be stable, reduce the control accuracy, and the static, dynamic characteristics of the system goes bad. (2) The integral: it is used to eliminate static difference, decrease the difference of process value and the setting value. The strength of the integral action depends on the size of the integration time, the smaller the integration time, the greater the integral action, but too much integral action can cause the oscillation of the system. (3) The differential: according to the change trend of deviation value, it regulates the control quantity of the system. Before the large changes in the amount of deviation, make the system control quantity in advance to change this trend, so as to accelerate the speed of adjustment, and reduce the adjusting time. If differential time is too big, it may cause the system oscillation [3] .
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Direct Fuzzy Adaptive Control for Standalone Wind Energy Conversion Systems

Direct Fuzzy Adaptive Control for Standalone Wind Energy Conversion Systems

Abstract—This paper presents a direct fuzzy adaptive control for standalone Wind Energy Conversion Systems (WECS) with Permanent Magnet Synchronous Generators (PMSG). The problem of maximizing power conversion from intermittent wind of time-varying, highly nonlinear WECS is dealt with by an adaptive control algorithm. The adaptation is designed based on the Lyapunov theory and carried out by the fuzzy logic technique. Comparison between the proposed method and the feedback linearization method is shown by numerical simulations verifying the effectiveness of the suggested adaptive control scheme.
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Adaptive Fuzzy FOPID Control Scheme for Path tracking of Mobile Robot

Adaptive Fuzzy FOPID Control Scheme for Path tracking of Mobile Robot

[21] T.Y. Abdalla, HA Hairik, AM Dakhil , “Minimization of torque ripple in DTC of induction motor using fuzzy mode duty cycle controller ”, Energy, Power and Control (EPC-IQ), 1st International Conference on, IEEE 2010. [22] Z.T. Allawi , Turki Y. Abdalla, "An Optimal

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Fuzzy adaptive parameter control of a late acceptance hyper-heuristic

Fuzzy adaptive parameter control of a late acceptance hyper-heuristic

The progress plot of the late acceptance list length, objective function values of the best and current solution at each stage entry is shown in Fig. 3 during the best run for the instance#2 (for which F-LAHH performs well). From this plot, we can see that the fuzzy system controls the list length in each stage to allow an adequate amount of diversification and intensification improving the quality of the solution in hand. A general trend was observed where the list length tended to increase over time, from about 22000 in the initial stages to about 26000 in the latter stages, and the amount by which the list length was changed decreased until the search stagnated, at which point changing the list length would have no effect and therefore the fuzzy system makes no change to the list length. On the other hand, it is observed that the worst run on this instance did not allow enough diversification and therefore converged too quickly resulting in solutions whose quality was worse than if more diversification was allowed.
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Determination Of Adaptive Control Parameter Using Fuzzy Logic Controller

Determination Of Adaptive Control Parameter Using Fuzzy Logic Controller

Fateh [7] improves his previous study [8] and applied to a three-joint articulated flexible-joint robot. This study based on torque control strategy. Stability of the system was guaranteed and performance of the control system is evaluated. In this paper, a new fuzzy-adaptive control law is developed based on the Lyapunov function, thus stability of the system is guaranteed. First, adaptive control law is identified then, control parameter is defined by fuzzy logic controller. After simulation results, it has been seen that fuzzy logic controller improve the performance of the adaptive control law.
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Fuzzy Adaptive P&O Control for MPPT of a Photovoltaic Module

Fuzzy Adaptive P&O Control for MPPT of a Photovoltaic Module

The Fuzzy block inputs are presented in Figures 11 and 12. According to the set of rules of the Fuzzy con- troller The MPP is achieved when both ΔP and Δ V are zero. Moreover, the dynamic response of the con- troller is shown in Figure 13 (output signal ΔD ), where the steady state is achieved in 2.5ms. Note that, at this time the power supplied by the PV module accomplished the maximum power point (Figure 14) at 13V (Figure 15) and duty cycle equal to 0.3 (Figure 16).

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Attitude Control of a Quadrotor with Optimized PID Controller

Attitude Control of a Quadrotor with Optimized PID Controller

In some papers the quadrotor helicopter has also been controlled using a linear controllers based on lineariza- tion models. In [12] two control techniques were com- pared, a PID and a Linear Quadratic Regulator (LQR), where a linearization model was considered to design the PID controller. The development of the LQR was based on a time variant model. The time-optimal control prob- lem of a hovering quadrotor helicopter is addressed in [13]. Instead of utilizing the Pontryagin’s Minimum Prin- ciple (PMP), in which one needs to solve a set of highly nonlinear differential equations, a nonlinear program- ming (NLP) method is proposed. In this novel method, the count of control steps is fixed initially and the sam- pling period is treated as a variable in the optimization process. Nonlinear control problems for hovering qua- drotor helicopters such as feedback linearization control and back-stepping control laws were studied in [14]. Back-stepping based techniques are utilized to design a nonlinear adaptive controller which can compensate for the mass uncertainty of the vehicle. Lyaponve based sta- bility analysis shows that the proposed control design yields asymptotic tracking for the UAV’s motion in x, y, z direction and the yaw rotation, while keep the stability of the closed loop dynamics of the quadrotor UAV [11]. In [15] the rotor dynamics were considered in the model. The model was split up into two subsystems: the angular rotations and the linear translations and then back-step- ping and sliding mode techniques were used to control the helicopter. In [7] a control law based on a standard back-stepping approach for translational movements and a nonlinear
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Adaptive neuro-fuzzy control of an induction motor

Adaptive neuro-fuzzy control of an induction motor

Neuro-fuzzy network system combines the advantages of neu- ral network and fuzzy logic system. Neural network provides connectionist structure and learning abilities to the fuzzy logic systems, and the fuzzy logic systems provide neural networks with a structural framework with high-level fuzzy IF-THEN rule of thinking and reasoning. Neural network-based fuzzy systems, NF have the learning ability of neural networks to realize the fuzzy logic inference system, are gained popularity in the control of nonlinear systems [13]. The adaptive NF inference system (ANFIS) is one of the proposed methods to combine Fuzzy logic and artificial neural networks. Fig. 5 shows the adaptive NF inference system structure. It is com- posed of five functional blocks (rule base, database, a decision making unit, a fuzzyfication interface and a defuzzyfication interface) which are generated using five network layers:
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Quadrotor multibody modelling by vehiclesim: adaptive technique for oscillations in a PVA control system

Quadrotor multibody modelling by vehiclesim: adaptive technique for oscillations in a PVA control system

methodology employed to stabilize and guide the vehicle is PVA (Proportional- Velocity-Acceleration), derived and implemented by using Simulink. As it will be shown, it stabilises and provides satisfactory quadrotor trajectory tracking. Since the control methodology feeds back the acceleration of the vehicle, and this acceleration has an oscillating nature, an adaptive process has been designed and introduced into the vehicle’s model in order to avoid the oscillations’ transmission to the control system, showing how it reduces the amplitude of the control actions oscillations.
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ADAPTIVE FUZZY CONTROL OF PRESSURE AND LEVEL

ADAPTIVE FUZZY CONTROL OF PRESSURE AND LEVEL

such a case the multivariable process can be controlled using independent loop controllers. Decouplers are derived from a mathematical model of a plant and the model itself should be not complicated [3, 6, 7]. But the coupling and non-minimum-phase behavior, the nonlinearities from valves, high amount of noise present in sensor readings (caused by turbulent water flow) complicate mathematical modeling of the sys- tem. It was experimentally shown in [4] that the derived mathematical model of the analyzed level- pressure system is adequate only at the designed ope- rating regime and requires tuning of its parameters each time the set points changes. Considered that, and the fact, that the model-based control approach will not, in this case, significantly improve the level-pres- sure control results in practice, comparing to PI cont- rol (noise forbids derivative action, and non-minimum phase limits bandwidth) [3], fuzzy logic was intro- duced to control level-pressure system. To overcome the problem with the loop interactions, a fuzzy com- pensator was used instead of the pressure loop de- coupler. The control system is shown in Figure 4.
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Fuzzy intelligent control method for improving flight attitude stability of plant protection quadrotor UAV

Fuzzy intelligent control method for improving flight attitude stability of plant protection quadrotor UAV

Abstract: At present, the attitude control method of plant protection UAV is the classical PID control, but there are some imperfections in the PID control, such as the contradiction between speediness and overshoot, the weak anti-jamming ability and adaptability. The physical parameters of plant protection UAV are time-varying, and the airflow also interferes with it. The control ability of classical PID is limited, and its control parameters are fixed, and its anti-jamming ability and adaptability are not strong. Therefore, a fuzzy adaptive PID controller is proposed in this paper. Fuzzy logic control is used to optimize the control parameters of PID in order to improve the dynamic and static performance and adaptability of attitude control of plant protection UAV. In the process of research, the mathematical model of UAV is established firstly, then the fuzzy adaptive PID is designed, and then the simulation is carried out in Simulink. The simulation results show that the fuzzy adaptive PID controller has better dynamic and static control performance and adaptability than the traditional PID controller. Therefore, the proposed control method has excellent application value in the attitude of plant protection UAV.
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Control of Thermal Power System Using Adaptive Fuzzy Logic Control

Control of Thermal Power System Using Adaptive Fuzzy Logic Control

FL is used in weather forecasting system since global climate is unpredictably changing and airports need to be informed of the changes every instant of time. FL is also used in biological processes such as production of drugs. Many techniques have been used for controlling and automating biological processes; however, they were unsuccessful because of lack of information in some of the biological reactions, complexity of mathematical modelling of the systems, and unavailability of sensors. FL is used in some home appliances such as washing machines. For washing machines, sensors continually monitor conditions inside the machine and accordingly adjust the setting for the best wash result. FL is used in transportation system in Japan. Sendai trains in Japan include FL control for smart transmission, breaking system, traffic planning, predicting number of customers, and energy consumption. FL led to tremendous improvement in autonomous robotics control systems. In 1990s, Motorola produced a FL based microcontroller that was well suited for designing autonomous robots.
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