The stability of temperature in the chamber of excimer laser has a great effect on working performance of the excimer especially for the energy stability and useful life. So it is very important to keep the chamber te...
详细信息
ISBN:
(纸本)9781479954582
The stability of temperature in the chamber of excimer laser has a great effect on working performance of the excimer especially for the energy stability and useful life. So it is very important to keep the chamber temperature constantly. Based on that, a high precision temperature control system of excimer laser and two improved PID control algorithms were designed. Experimental results indicate that the designed system runs reliably and has superior control precision which provides a favorable temperature environment for the laser's operation.
This paper introduces the advanced control designed for the single-phase AC/DC traction converter. This type of control provides direct current control and sufficient control of output voltage. The proposed control st...
详细信息
ISBN:
(纸本)9788021448179
This paper introduces the advanced control designed for the single-phase AC/DC traction converter. This type of control provides direct current control and sufficient control of output voltage. The proposed control strategy is based on second order general integrator phase locked loop (SOGI-PLL), which is used for trolley voltage synchronization. In this case SOGI-PLL evaluates voltage position, amplitude and frequency. These data are used for precise and robust current control, which uses PR controller. The behavior of designed control and SOGI-PLL synchronization is analyzed by both simulations and experiments made on developed 1.5 kW laboratory prototype.
Wind power output has the characteristics of being intermittent and low quality, which have a negative effect on the spread of renewable energy sources. To solve these problems, energy storage systems (ESSs) are used....
详细信息
ISBN:
(纸本)9781479936564
Wind power output has the characteristics of being intermittent and low quality, which have a negative effect on the spread of renewable energy sources. To solve these problems, energy storage systems (ESSs) are used. ESSs have demonstrated that high-quality power from renewable energy sources can be supplied through the charge and discharge operation of an ESS. In this paper, ESS control methods are studied to operate a power grid connected wind turbine with stable condition. First, we introduce an output smoothing method to mitigate the unstable system with a wind turbine, and then a moving average method is proposed to obtain the target output. An output-smoothing algorithm considering the constraints of a battery ESS (BESS) is presented. Additionally, this algorithm is simulated by MATLAB with actual wind turbine data.
A method for aerial rendezvous of small unmanned aircraft systems is proposed. The system includes placing a passively towed drogue into an orbit that is suitable for a small unmanned aircraft systems to follow, and a...
详细信息
A method for aerial rendezvous of small unmanned aircraft systems is proposed. The system includes placing a passively towed drogue into an orbit that is suitable for a small unmanned aircraft systems to follow, and a seeker guidance method for use with a monocular camera mounted on the centerline of the unmanned aircraft systems. The principle contributions of the work include a method for controlling the drogue path in moderate winds by manipulating the mothership orbit and airspeed, and a vision-based nonlinear pursuit tracking method that uses pitch rate and roll commands to guide the unmanned aircraft systems to an aerial rendezvous with the drogue. Simulation and flight-test results are presented to demonstrate the suitability of these methods.
This paper presents an analysis result of grasp-move-and-twist motions of robotic hands equipped with optical three-axis tactile sensor to evaluate performance of a new control algorithm based on tactile slippage sens...
详细信息
This paper presents an analysis result of grasp-move-and-twist motions of robotic hands equipped with optical three-axis tactile sensor to evaluate performance of a new control algorithm based on tactile slippage sensation. The optical three-axis tactile sensor is capable of defining normal and shear forces simultaneously. The proposed algorithm consists of robot arm and hand controls based on parameters of normal and shear force, and slippage detection. To improve performance during grasp, move and twist motions, we present analysis of slippage direction and classify the control algorithm in two phases: grasp-move-release and grasp-twist. We present detailed explanation of the control algorithm based on the existing robot arm control system. The experiment is conducted using a bottle cap, and the analysis results show that the slippage control parameters enhanced performance of grasp control in simultaneous robot tasks. Experimental results revealed good performance of the proposed control algorithm to accomplish the proposed grasp-move-and-twist motions.
In this paper, a mission planning problem for a team of collaborating vehicles is presented. The team consists of two vehicles: an aircraft, typically fast but with short flight endurance, and a marine carrier, typica...
详细信息
In this paper, a mission planning problem for a team of collaborating vehicles is presented. The team consists of two vehicles: an aircraft, typically fast but with short flight endurance, and a marine carrier, typically slow but with negligible endurance limitations. The carrier is able to transport, deploy, recover, and service the aircraft. This paper focuses on the problem of determining the team's trajectory that minimizes the time to visit a given set of locations. Since the resulting optimization problem is computationally difficult, a low-complexity heuristic is proposed. The proposed heuristic is obtained by decomposing the original problem into three easier subproblems. The effectiveness of the proposed method is validated through extensive numerical simulations.
暂无评论