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In this work, Pt/AlN/Sapphire SAW resonator operating in 2.45GHz ISM band is studied as a potential sensor for high temperature and high frequency applications. Experimental characterization was realized using a specific station probe between room temperature and 500°C. Results show that electromecahnical factor of the structure (K2) increase with temperature, while the quality factor decreases. The...
There is a challenge to segment the medical image which is often blurred and consists of noise. The objects to be segmented are always changing shape. Thus, there is a need to apply a method to automated segment well the objects for future analysis without any assumptions about the object's topology are made. In general, when performing pregnancy ultrasound scanning, obstetrician needs to find out...
Fault tolerant control system (FTCS) provides an efficient technique to ensure the system goal to be achieved in spite of faults. This paper proposes the application of model based sensor fault tolerant control system for truck pulling a trailer system, an automobile suspension system and filed-controlled direct current (DC) motor system. The fault tolerant control design is divided into two parts...
Traffic congestion in the urban area occurs more frequent than the past due to rapidly increasing on road vehicle usage rates. It could seriously hinder the development of urban area if a well management system has not being established. These scenarios necessitate the development of advance traffic management systems to increase the performance of signalized intersection. Traffic signal timing management...
Sensor faults affect the system's performance in the closed loop when the faulty sensor readings are used in a feedback control system. This paper presents an observer based sensor fault tolerant control system for practical implementation on modified feedback configuration for close loop control systems. The purpose of this system is to maintain the safety of the system and reliability of the process...
In this paper, model predictive control is applied to an inverted pendulum apparatus and the effect of input disturbance are studied. The optimization problem is solved on-line using quadratic programming approach on a PC hardware platform.
Using the Z-scan technique, we verify the threshold energy for a 19 ps laser to induce outward solute migration decreases with the increase of the solution temperature, well agreeing with our proposed potential well model.
Using the Z-scan technique with an 800-nm 28 femtosecond laser running at 82-MHz, we verify thermal lensing effect accumulated across pulses in a transparent (both linear and nonlinear) liquid: methanol.
This paper presents parameter tuning of model predictive controller. The effect of prediction horizon on the stability of the system is studied. The performances of model predictive controller and linear quadratic regulator on the inverted pendulum are compared.
Obtaining the joint variables that result in a desired position of the robot end-effector called as inverse kinematics is one of the most important problems in robot kinematics and control. As the complexity of robot increases, obtaining the inverse kinematics solution requires the solution of non linear equations having transcendental functions are difficult and computationally expensive. This paper...
Motion planning capability is an essential part of an industrial robot system. Therefore research in robot motion planning remains as one of the important fields of study in the task of building industrial robot systems. A new method for the motion planning is presented in this paper. The basic idea is to find a smooth path consisting of points close enough to each other. Then the computation of the...
This paper addresses the usage of the boundary-layer concept in removing the chatter that occurs in sliding mode control applications in the area of controlling the speed and flux of induction motors. Although this concept succeeds in removing the chatter from the system, it introduces a stability problem. This paper proposes a fuzzy controller that acts as a supervisory controller for a sliding mode...
An iterative method using the neural networks to solve the inverse kinematics problem for equal length links redundant manipulators is presented in this paper. The training phase, calculating the neural networks weights, is accomplished for a new proposed geometrical method to solve the problem of multi-solution caused by redundancy. The use of this geometrical method results in one solution among...
This paper describes a new geometrical method to solve the inverse kinematic problem for hyper redundant manipulators. The proposed method finds one solution from these infinite solutions. By using this method, the angles between each adjacent links are the same, which makes controlling the movement of these links easier and makes a lining up of two or more joint axes not possible, i.e. very effective...
In this paper, we proposed a model based sensor fault tolerant control system embedded in a generic PIC microcontroller for use in a temperature control system. The model based fault tolerant control algorithm is embedded in the microcontroller for stand-alone real-time implementation. The algorithm consists of a PID controller element (for nominal control) and a fault compensating element. Results...
This paper considers in particular the design of a controller based on model predictive control and feedback linearization methods for gantry systems. In order to meet the operation requirements of fast anti-swaying and precise positioning of gantry crane systems, a practical optimal control scheme is presented. This controller is designed to guarantee the performance in presence of a class of nonlinear...
This paper presents the design of a fuzzy logic sliding mode controller to control a permanent magnet synchronous motor. Fuzzy logic is introduced to the system to solve the chattering problem associated with sliding mode controllers. Based on the proposed switching surface, a switching control law that satisfies the hitting condition and guarantees the existence of the sliding mode is designed using...
This paper proposes a new fuzzy gain scheduled proportional, integral and derivative (FGPID) controller by using Takagi-Sugeno (TS) fuzzy system to the load frequency control problem in multi-area power systems. The TS fuzzy inference engine is chosen and the range of the controller is selected suitably to enhance the output performance of the system. Simulation results demonstrate the ability of...
This paper presents the design of a set of sliding mode controllers for a quadrotor vertical take-off and landing (VTOL) unmanned air vehicle. To facilitate the design process of this under-actuated system, this paper proposes the use of a simple yet effective method to plan the action of each variable controller in the system and hence enhance the performance of the quadrotor. To stabilize the overall...
In this paper, two-dimensional photonic crystal band-edge lasers of triangular lattice is designed based on photonic band diagrams and the organic material PTT acts as the gain media. The gain medium consists of a small molecule blue emitting dye 2-(4-(pyren-l-yl)phe-nyl)triphenylene (PTT) doped in poly(N-vinylcarbazole) PVK. The emission characteristics are presented. The lasing phenomenon is occurred...
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