Top PDF Development of an adaptive fuzzy logic controller for HVAC system

Development of an adaptive fuzzy logic controller for HVAC system

Development of an adaptive fuzzy logic controller for HVAC system

Table 8.2-3: Comparison of total actuator travel distance/cycle between chilled water valve on AHUA (AFLC-GA) and AHUB (PIDL) for variation in SATSPT test. Comparison test results for [r]

256 Read more

Development of position tracking of BLDC motor using adaptive fuzzy logic controller

Development of position tracking of BLDC motor using adaptive fuzzy logic controller

The theoretical design of a fuzzy iterative learning controller for sampled-time linear time invariant systems is presented in this project. The project also investigates of digital circuit implementation of the proposed controller with application to repetitive position tracking control of DC servo motors. The stability and convergence of the learning system are analyzed under uncertainties of initial state errors, input disturbance and output measurement error. This project also stress that the learning error will converge to a residual set whose level of magnitude will depend on the size of the uncertainties. The learning error will asymptotically converge to zero if all uncertainties disappear. To improve the learning performance, a concept of fuzzy learning gain is introduced which is designed based on the tracking error in the current and past iteration.
Show more

36 Read more

EFFICIENCY INCREASING FUNCTION FOR PMSM DR IVE USING ADAPTIVE FUZZY LOGIC CONTROLLER

EFFICIENCY INCREASING FUNCTION FOR PMSM DR IVE USING ADAPTIVE FUZZY LOGIC CONTROLLER

Assistant Professor, Department of Electrical and Electronics Engineering, SNS College Engineering, TamilNadu, India 5 Abstract: The research paper involves based on Function Torque Adapted Gain Fuzzy Inference System (FTAGFIS) adaptive speed controller for the Permanent Magnet Synchronous Motor (PMSM). The proposed research area controller was developed using Adaptive Neuro Fuzzy Inference System (ANFIS). The expanded version of the FIS not only suggests the effectiveness of using the ANFIS to develop an adaptive speed controller for drives but also the effectiveness of the methodology that was employed to train the FIS. The results are under development using Adaptive control algorithm. Previous paper presents tracking and recovery performance from motor parameter variations, load torque and speed disturbances, which indicates the ability of the PMSM to self- adapt itself to different operating conditions here our paper involves the efficiency and reduced mechanical parameters and disturbances. .
Show more

12 Read more

Aircraft Yaw Control System using LQR and
Fuzzy Logic Controller

Aircraft Yaw Control System using LQR and Fuzzy Logic Controller

Today’s aircraft designs rely heavily on automaticcontrol system to monitor and control many of aircraft’s subsystems. The development of automatic control system has played an important role in the growth of civil and military aviation.The architecture of the flight control system, essential for all flight operations, has significantly changed throughout the years. Soon after the first flights, articulated surfaces were introduced for basic control, operated by the pilot through a system of cables and pulleys. This technique survived for decades and is now still used for small airplanes. The introduction of larger airplanes and the increase of flight envelopes made the muscular effort of the pilot, in many conditions, not sufficient to control the aerodynamic moments consequent to the surface deflection. The first solution to this problem was the introduction of aerodynamic balances and tabs, but further grow of the aircraft sizes and flight enveolpes brought to the need of powered systems to control the articulated aerodynamic surfaces. Modern aircraft include a variety of automatic control system that aids the flight crew in navigation, flight management and augmenting the stability characteristic of the airplane.Theautopilot is an element within the flight control system. Designing an autopilot requires control system theory background and knowledge of stability derivatives at different altitudes and Mach numbers for a given airplane [3..The number and type of aerodynamic surfaces to be controlled changes with aircraft category. Aircraft have a number of different control surfaces: the
Show more

6 Read more

Development of pc based fuzzy logic controller for DC motor

Development of pc based fuzzy logic controller for DC motor

Because the peripheral control and devices are enough, there is the more extensive application in the industry control system. Therefore, the DC motor control is larger than other kinds of motors then are no matter in the theoretic study in the research and development application. The measurement and control can be achieved by PC-based. However, the technique of Instrument design also moves forward the times of “virtual instrument”, not only the designing time is shorten, but also the designing space is more elastic extension. This project presents to guide the motor speed control field with the various advanced computer technology and the development platform of software/hardware. Let the dynamic state response of motor have a better efficiency.
Show more

38 Read more

Development of a Fuzzy Logic Controller for Industrial Conveyor Systems

Development of a Fuzzy Logic Controller for Industrial Conveyor Systems

A linear model is first computed from the nonlinear Simulink model of the FLC before the linear response plotted. During simulation, the software linearizes the portion of the model between specified linearization inputs and outputs, and plots the response of the linear system. The Simulink model can be continuous- or discrete-time or multi- rate and can have time delays depending on whether the design is aimed to be implemented in real-time hardware. Refer to Table 4 for a complete list of the response performance indices of the FLC.
Show more

6 Read more

Design And Development Of Fuzzy Logic Based Level
Controller

Design And Development Of Fuzzy Logic Based Level Controller

The concept of Fuzzy Logic was conceived by Lotfi Zadeh, a professor at the University of California at Berkley, and presented not as a control methodology, but as a way of processing data by allowing partial set membership rather than crisp set membership or non-membership. This approach to set theory was not applied to control systems until the 70's due to insufficient small-computer capability prior to that time. Professor Zadeh reasoned that people do not require precise, numerical information input, and yet they are capable of highly adaptive control. If feedback controllers could be programmed to accept noisy, imprecise input, they would be much more effective and perhaps easier to implement [2].
Show more

24 Read more

An MPPT Control of Photovoltaic system using Fuzzy Logic Controller

An MPPT Control of Photovoltaic system using Fuzzy Logic Controller

A number of soft computing techniques exist for maximum power tracking. This includes Neural network, adaptive fuzzy etc. In neural network (NN) technique, a trained neural network outputs the reference voltage for MPP. The reference voltage can be attained using either a fuzzy or a PI controller. This can be done with less computational efforts and the knowledge of internal system parameters may not be required. Neural network has to be periodically trained since the characteristics of a PV array can change with time. Section II provides details about photovoltaic system and MPPT strategy. Proposed fuzzy logic controller is explained in Section III and the verified simulation results are presented in Section IV which is followed by conclusion in Section V.
Show more

6 Read more

Optimization of a fuzzy logic controller for MR dampers using an adaptive neuro-fuzzy procedure

Optimization of a fuzzy logic controller for MR dampers using an adaptive neuro-fuzzy procedure

The results show a considerable vibration reduction using the MR damper as a passive energy dissipation device in a passive ON con¯guration. The increase of the operating current in the MR damper has a signi¯cant e®ect in the damping force and the energy dissipation capacity of the device. Figure 13 displays the structural re- sponse of each °oor obtained with the proposed fuzzy based control system along with the uncontrolled response of the third °oor during the numerical simulation. As can be seen, the proposed semi-active control system achieves a good performance in reducing the structural responses using only °oor velocities as the reference (input) signals to compute the control action. In fact, the main advantage of this fuzzy logic based control system is that only the ¯rst and third °oor velocities of the structure are required to determine the desired control signal. This means that the damping
Show more

18 Read more

Adaptive Speed Control for Autonomous Mobile Robot using Fuzzy Logic Controller

Adaptive Speed Control for Autonomous Mobile Robot using Fuzzy Logic Controller

Regarding the membership type used in Fuzzy Logic, other choices than the triangular membership are available such as the gaussian membership, trape- zoid membership or sigmoid membership. As explained above, researcher usu- ally applies the triangular membership as it is seems to be easier than other membership. Even if this is the factor, there were also some other findings that discovered very interesting results as shown by V.O.S Olunloyo et al.[10]. Based on their findings, the triangular membership can exhibit linguistic error as it may not defines properly the real system conditions. As a result, the gaussian membership can be the best membership to describe any practical system for most engineering application. Moreover, gaussian membership may surpassed triangular membership function if better tracking performance is being priori- tized[11].
Show more

8 Read more

An Adaptive Fuzzy Logic Controller Trained by Particle Swarm Optimization for Line of Sight Stabilization

An Adaptive Fuzzy Logic Controller Trained by Particle Swarm Optimization for Line of Sight Stabilization

In recent years, fuzzy logic based control schemes have become a topic of great interest. It is one of the active areas of research in the applications of fuzzy set theory, because conventional controllers cannot be used due to lack of knowledge regarding the input- output models [1,3]. These methods have been used successfully in many real-world applications [2,8]. Fuzzy logic based controllers are generally applicable to systems that do not accurate mathematical models and require only qualitative guidance through experienced operators for their implementation [4]. Fuzzy logic is conceived as a tool for dealing with uncertainty but has proven to be an excellent choice for many control system applications. The fast developments in the technology relating to hardware systems required for implementing fuzzy logic based controllers like fuzzy memory devices, fuzzy computers etc. have made a way for effective utilization of fuzzy logic even in complex and ill defined
Show more

5 Read more

Realization of Fuzzy Logic Temperature Controller

Realization of Fuzzy Logic Temperature Controller

Abstract - The paper proposes the realization of a Fuzzy Logic Temperature Controller. In this paper an analysis of Fuzzy Logic Controller is made and a temperature controller using MATLAB is developed. Here we used Fuzzy Logic Toolbox which is very useful software for development and testing of Fuzzy Logic system. It can be very quickly implemented and its visual impact is very encouraging. In this controller the Rule Base, membership functions and inference engine are developed either using digital systems such as memory and logic circuit or it can be developed using analog CMOS circuits. Analog Fuzzy systems are popular because of their continuous-time-processing and high frequency and low power implementation.
Show more

5 Read more

A Sophisticated Algorithm for Using Fuzzy Logic Controllers in Adaptive Cruise Controller Systems

A Sophisticated Algorithm for Using Fuzzy Logic Controllers in Adaptive Cruise Controller Systems

From old days the transportation systems have been one of the most significant aspects of our life. Today’s rapid increasing of traffics in roads, the most frequent driving scenario [1], demands enormous increasing of intelligent transportation systems (ITSs). One of the applications of ITS is to provide the assistance to the control of some of the vehicle elements, like the throttle pedal and consequently, the speed-control assistance [2]. Adaptive cruise control (ACC) system is a new generation of conventional cruise control systems. But, unlike the conventional cruise control structures, this new system can automatically adjust the speed in order to maintain a proper headway distance (gap) between vehicles in the same lane [3,4]. This is achieved by using a radar headway sensor such as lidar [5], a digital signal processor, and an intelligent speed control system [6]. If the front vehicle slows down, or another obstacle is detected, the ACC sends a signal to the engine and the braking system decelerates the vehicle. On the other hand, when the front vehicle speeds up, or no obstacle is detected, the ACC will re-accelerate the vehicle back to the default speed [7,8]. Because of the ability of fuzzy logic controller (FLC) in mimicking human behaviour, it can be used as a good bridge to achieve this goal.
Show more

8 Read more

Development of PC based fuzzy logic controller for DC motor

Development of PC based fuzzy logic controller for DC motor

This paper propose the Fuzzy Logic Controller (FLC) to control the speed of DC motor using LabVIEW and display the speed of the motor in real-time in order to obtain the system response of FLC. The real-time monitoring of DC motor not only can substitute the traditional instrument but also can be used to observe the machine operating normally or not. This programming system is based on a structure of the PC, and combines the DC motor supervision needed instrument which then replaces other hardware equipment with the cheaper and more efficient method to facilitate operators with the graphical friendly interface.
Show more

5 Read more

Comparative Study of a Fuzzy Logic Based Controller and a Neuro-Fuzzy logic Based Controller for Computer Fan

Comparative Study of a Fuzzy Logic Based Controller and a Neuro-Fuzzy logic Based Controller for Computer Fan

The impact of soft-computing in modern day engineering and technology cannot be overemphasized. Fuzzy logic approach as proposed by Lofti Asker Zadeh, popularized by the Japanese, has found its way into the control of many domestic and industrial appliances/machines. Unlike the popular PID controllers and the pulse width modulation based controllers, the performance of computer fan is investigated using the fuzzy logic approach with two inputs parameters, that is, the computer loads and the temperature and one output parameter which is the speed at which the computer fan operates. For the fuzzy inference system, four membership functions are selected for the inputs as well as the output. Relevant rules are set to determine the operating conditions and boundaries for the controller. In order to make the controller adaptive, neurofuzzy logic appproach is used with parameters set as the case with fuzzy logic. Training of the controller is carried out and the performance of each controller is presented in three dimensional view and two dimensional surface view with neurofuzzy based controller, in performance, having an edge over the fuzzy logic based controller.
Show more

11 Read more

Direct adaptive interval type-2 fuzzy logic controller for the multivariable anaesthesia system

Direct adaptive interval type-2 fuzzy logic controller for the multivariable anaesthesia system

The IT2-FLC contains four components fuzzifier, inference engine, rule base, and output processing that is inter-connected as shown in Fig. 5 [28] . The IT2-FLC works as follows [15] : the crisp input is first fuzzified into input IT2-FSs. The input IT2- FSs then activate the inference engine and the rule base to pro- duce output IT2-FSs. The IT2-FLC rules will remain the same as in T1-FLC, but the antecedents and/or the consequent will be represented by IT2-FSs. The IT2 fuzzy outputs of the infer- ence engine are then processed by the type reducer, which com- bines the output sets and performs a centroid calculation that leads to T1-FSs called the type-reduced sets. After the type reduction process, the type-reduced sets are defuzzified (by taking the average of the type-reduced set) to obtain crisp outputs.
Show more

12 Read more

Digital Control of Magnetic Levitation System using Fuzzy Logic Controller

Digital Control of Magnetic Levitation System using Fuzzy Logic Controller

PID control requires the model of the system for the determination of the parameters of PID controller using control theory and finally the development of an algorithm for the controller [2]. However, in case of fuzzy logic, the system behavior is characterized using human knowledge which directly deals with the design of control algorithm on the basis of fuzzy rules. These rules are described in terms of the relationship of inputs to their corresponding outputs, and precisely determine the controller parameters. Any adjustment or debugging only requires modification in these fuzzy rules instead of redesigning the controller [4,5,8]. Hence control technique based on fuzzy logic not only simplifies the design, but also reduces the monotonous task of solving complex mathematical equations of nonlinear systems.
Show more

5 Read more

Development Of Fuzzy Logic Temperature Controller - Micro Controller Base

Development Of Fuzzy Logic Temperature Controller - Micro Controller Base

Observers were impressed with this demonstration, as well as later experiments by Yamakawa in which he mounted a wine glass containing water or even a live mouse to the top of the pendulum. The system maintained stability in both cases. Yamakawa eventually went on to organize his own fuzzy-systems research lab to help exploit his patents in the field. [3]

24 Read more

Design of Fuzzy Logic Tracking Controller for Industrial Conveyor System

Design of Fuzzy Logic Tracking Controller for Industrial Conveyor System

The paper by [8]studied the use of belt for high precision applications that became appropriate because of the rapid development in motor and drive technology as well as the implementation of timing belts in servo systems. Modeling of a linear belt-drive system and designing its position control were examined in the research work. Friction phenomena and position dependent elasticity of the belt were analyzed. Computer simulated results showed that the developed model was adequate. The PID control for accurate tracking control and accurate position control was designed and applied to the real test setup. Both the simulation and the experimental results demonstrated that specifications. The designed controller met the specified performance specifications.
Show more

8 Read more

Adaptive Fuzzy Logic Controller for Rotary Kiln Control

Adaptive Fuzzy Logic Controller for Rotary Kiln Control

In this paper, a model that behaves exactly like Cement kiln is identified using System Identification toolbox in MATLAB with kiln speed (KS), Coal feed (CF), Kiln feed (KF) and Preheater fan speed (PHFS) as inputs and Burning Zone Temperature (BZT), Torque (TOR) and Kiln inlet temperature. A Fuzzy Logic Controller is then designed to work on this system for desired set points. The system is then made adaptive to work on a range of set points.

5 Read more

Show all 10000 documents...