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The feedback synchronization of spatiotemporal chaos is investigated. An effect feedback form for synchronization that can make the error dynamics equi-attractived in the large is proposed and proven. Numerical simulations show the validity of the synchronization schemes.
In this paper, a 100W PEM fuel cell as the primary power supply provides DC power for a Peltier based cooling process. For the fuel cell, there exist slow dynamic response and soft characteristic. Therefore, fuel cell based hybrid power system is designed, including fuel cell, battery, unidirectional DC-DC converter and bidirectional DC-DC converter. In order to reduce the slow dynamic response and...
This paper purposes an optimal configuration of the distributed hybrid renewable generations based the stand-alone micro-grid system, considering the diesel as the main control source. Due to the natural sources and load of user changes randomly and the nonlinearity of the power output by renewable generations, an intelligent optimization method based improved genetic algorithm and the control strategy...
Recently, electric wheelchair STAVi that is a welfare vehicle has been developed to use indoors as well as outdoors. It is easy for a disabled person to climb into this wheelchair from a bed because they can do so by piggybacking from a bed or chair. This wheelchair is manipulated by a joystick in order to make driving easier. Further driver's posture is kept by the armrests for safety. In the narrow...
For specific purpose, tracked robot that can be controlled remotely and able to acquire images from environment is very important, for example in rescuing disaster victims. We propose architecture for Raspberry pi and AVR-based mobile robot that can be controlled by low cost remote controller Integrated Circuits(IC) and able to avoid obstacles using ultrasonic distance sensor. This prototype also...
In this paper, designing of the LQR controller and observer with intelligent tools for the triple inverted pendulum is investigated. Intelligent tools are considered as GA and GA-PSO optimization algorithms and fuzzy logic to qualify achieving LQR gains. The pendulum is swung up from the vertical position to the unstable position. The rules for the controlled swing up are heuristically achieved such...
The two-degree-of-freedom structure allows us to design independently feedforward and feedback controls for response shaping and stabilization, respectively. Feedforward control with on-line tuning is particularly promising for improvement of response, so that various schemes have been proposed in literature. This paper proposes yet another scheme along this direction with focus on the control structure...
In this paper, a robust nonlinear tracking control design for an ionic polymer metal composite (IPMC) with uncertainties is proposed by using Neural Network based sliding mode approach. The IPMC, also called artificial muscle, is a novel smart polymer material, and many potential applications for low mass high displacement actuators in biomedical and robotic systems have been shown. In general, the...
Proportional-Integral-Derivative(PID) control is widely used in DC motor system, because of its simple structure, high reliability and so on. However, the parameters of PID controller is commonly tuned by manual method and it also has large overshoot phenomenon for nonlinear and time-varying systems. So it is difficult to get ideal control effect. In order to overcome the defect of PID whose parameters...
In this paper, a robust tracking control design for nonlinear plants with perturbation is considered by using operator-based observers and robust right coprime factorisation approach. In real situations, there exist unknown uncertainties consisting of modeling errors and external disturbances. The robust right coprime factorization approach is convenient in researching input-output stability problems...
The purpose of this study is robust control in consideration of the nonlinearity of the DC-DC converter. Switching-mode DC-DC converter controls electricity by opening and shutting of the semiconductor switch. This type of DC-DC converter is small size, light weight and high efficiency. To do output voltage control in consideration of the nonlinearity of the DC-DC converter, the model formula is derived...
In the control of a pneumatic positioning stage, two issues have to be considered. The first issue is the low repeatability caused by variation of parameters in pneumatic system. The second one is the slowness of response due to air compressibility. To overcome these issues, this paper presents the control methods for the pneumatic positioning stage. To compensate for the parameter variation and improve...
This paper proposes a path planning method considering attitude constraints at given geometric points by utilizing the relation between acceleration and attitude. By characterizing the reference path with a parameter vector, optimization technique is introduced to refine the generated path. Numerical simulation with a physical model is also invoked in order to consider the transient response of the...
In diesel engined vehicles several electromechanical actuators like butterflies and valves are used to control the gas flow of the engine, e.g. the exhaust gas recirculation. In order to ensure an efficient engine performance regarding pollution, engine power and fuel consumption, high requirements are placed on the positioning accuracy and velocity of the actuator. Concurrently, the maximum possible...
This paper proposes a new power generation system that utilizes a thermoelectricity generation device. Currently, approximately 60% of generated energy is lost in the form of heat. It is important to utilize this wasted thermal energy in order to save energy. To solve this problem, this paper considers a power generation system that uses a thermoelectricity generation device. Although thermoelectricity...
Hybrid systems often appear as models of mechatronic devices, and are used to express the discontinuous transition in dynamics that occurs when mechanical contacts are made or broken. Contact state changes can coincide with dramatic shifts in control authority, and become sources of unwanted disturbance when they are exogenously driven. In the natural world, such systems appear in rapid legged locomotion...
This paper presents the local planning to introduce wind power into small-scaled rural power system. To determine both characters under normal and fault conditions of hybrid system, the limitation of wind power capacity is first determined; the static stability under normal operation is verified by using the regular and irregular wind speed of installation site. The fluctuant range of electric parameters...
Differential evolution (DE) is a simple yet efficient evolutionary algorithm. Because of its simplicity, effectiveness and robustness, DE has gradually become more popular and applied in various fields. In addition, a lot of works have been done to improve the search ability of DE. Among them, opposition-based DE (ODE), which is incorporated opposition-based learning (OBL), has shown better performance...
This paper presents a new vision technique for an industrial robot to pick up randomly placed workpieces. The proposed approach combines 2D and 3D vision for efficiently determining the spatial position of a target object in cluttered scenes. 2D vision permits to quickly detect and locate objects of interest, thus reducing significantly the processing time. The location of an extracted 2D region (a...
The amount of electricity a PV system generates depends on the intensity of the sunlight to which it's exposed. Obviously PV panels generate no electricity at night, and less in the morning and evening than in the middle of the day. How much electricity you will get from your PV panels is depended on the conversion efficiency of a PV cell as well as the designing your system. Improving this conversion...
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