The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a combined parameter estimation for permanent magnet synchronous machines (PMSMs), by which the rotor permanent magnet (PM) flux linkage and mechanical parameters such as the combined moment of inertia and viscous friction coefficient are estimated without the aid from nominal machine parameter values. The proposed estimation of rotor PM flux linkage is based on the addition of...
In the paper, a new method named Cartesian Space Synchronous Impedance Control (CSSIC) has been developed. The method combines the synchronous control and the impedance control together which can not only be used in the position control but can also realize the purpose of force control of the system with multi-manipulators. Therefore, if there are multi-manipulators grasping the same object, it can...
In this paper, a sub-Nyquist sampling system for multiband signals is presented, which can perform accurate spectrum sensing and reconstruction. The system is based on PXI bus and virtual instrument technology, which make the proposed system able to be adjusted flexibly for different input signals. Compressive sensing (CS) theory and modulated wideband converter (MWC) are adopted in the system. The...
This paper focuses on a robustness controller and the performance of a permanent magnet synchronous machine (PMSM) with parameter uncertainty. The proposed controller is composed by a model reference adaptive current controller and a torque compensator. An internal model of the PMSM is introduced to define the transient reference behavior of the current and torque. A simple adaptation rule of the...
Energy-efficient task scheduling is a fundamental issue in many application domains, such as energy conservation for mobile devices and the operation of green computing data centers. Modern processors support dynamic voltage and frequency scaling (DVFS) on a per-core basis, i.e., the CPU can adjust the voltage or frequency of each core. As a result, the core in a processor may have different computing...
Integrating an auxiliary (AUX) power supply into LED drivers is a popular trend to facilitate LED luminaire system design and reduce system cost and complexity. This AUX power supply can be used to power LED fixture cooling, lighting controller or other suitable electronic devices. In this paper, a cost effective architecture based on Flyback topology is proposed for both constant current (CC) output...
The short circuit problem is a difficult issue in LLC converter. This paper derives the state-plane trajectory of the full-bridge LLC converter based on state-plane analysis and the characteristics of the trajectory performance are provided under short circuit mode. Two types of control scheme for power switches, respectively based on phase-shift frequency-boost and frequency-drop method, are deduced...
With non-linear loads such as power electronic equipment getting more and more widely used in industrial and civil applications, harmonic current are becoming more damaging to electricity systems on both the power grid side and user side. An effective way to solve the problem is to us e the harmonic filter equipments. Active power filter (Active Power Filter, APF) compensates each harmonics simultaneously,...
In this paper, we present a hardware architecture for implementing an interior point method for model predictive control (MPC) on field programmable gate arrays (FPGA). The FPGA implementation allows the solution of quadratic programs occurring in MPC at very high speed. Experiments show that our hardware implementation is able to outperform an software implementation running on a high-end CPU while...
Image dehazing algorithm based on dark channel prior has been proved to be effective, but it cannot still guarantee accurate transmission. To solve this problem, we firstly propose a more reasonable estimation of atmospheric light, because bias in the atmospheric light estimation will cause an inaccurate transmission. Secondly, we improve the estimation of transmission in bright area so as to alleviate...
In order to achieve the UAV's precise positioning of the radiation target, firstly is to do the state estimation itself. The BDS/INS Integrated Navigation system is a high-precision real-time navigation scheme which has been widely used, it is not only able to pinpoint the UAV, but also can provide the UAV's navigation information such as speed, acceleration and attitude angle etc. so it can meet...
Arc detection is difficulty for the processing, assembly and testing of industrial production because of limitations of the detection method, algorithm and the instrument. The least-squares algorithm usually is used to fit data in circle detection. The application of the conventional least-squares algorithm is limited, its roundness error is bigger, and precision is lower. For detecting arc with data...
The frequent problems in computer vision consist of de-noising, artifact elimination as well as structure preserving or enhancing. PDE-based nonlinear diffusion filter may be one possibility to achieve those goals. In this paper, we perform comparison of three typical PDE-based regularization algorithms followed by the proposal of a general framework, which exploits fundamental significance for analyzing...
The performance of lithium-ion rechargeable battery depends on its coulombic efficiency, which determines the measurement accuracy of the state of charge as well. In this context, the regularity that coulombic efficiency changes with environmental temperature and charge-discharge rate was analyzed in different cases, and a TPS (Thin Plate Spline) surface fitting-based coulombic efficiency estimation...
A new rotor position sensor less detecting method based on high power electrically excited synchronous motors is proposed. The central idea is the back electromotive forces contain the information of rotor position, when a high frequency signal is injected in the rotor by excitation part. So the rotor position can be obtained by detection and calculation of motor back electromotive forces. By experimental...
Local stereo matching methods are still used widely because they are fast and simple. But the accuracy of local methods is much poorer than the global methods. They usually achieve accuracy at the expense of speed. Simple local methods are fast, but exhibit systematic errors. In this paper we propose an improved method based on support-weight approach, which can enhance the matching efficiency and...
A damping control strategy to improve the dynamic characteristics based on SVGs is proposed in this paper. The shaft model, induction generator model, converter control model and angle control model of DFIG (Doubly Fed Induction Generator) are presented. The alternating voltage control model and the voltage control model of SVGs (Static Var Generation) are built, the mathematical model of the damping...
This paper aims at the selection of optimal location of the terminal voltage nonlinear excitation controller to mitigate small signal stability problem. The controller consists of inverse compensator and proportional controller. One is designed to cancel nonlinear characteristics of the controlled object, the other is used to formulate the closed loop. Based on the simplified model of the generator...
Traffic sign detection and recognition is one of the important fields in the intelligent transportation system, and is expected to provide information on traffic signs and guide vehicles during driving. Traffic sign segmentation is the first stage in traffic sign recognition system, and segmentation results influence the recognition results. This paper presents an efficient method for traffic sign...
For resonance driven energy harvesting devices, mass considerations play a critical role in matching structural resonant frequency to flow driven Vortex Induced Vibration (VIV) frequencies for optimized vibration inputs. In this paper, we present: 1) experimental data showing how mass ratio can sustain “lock-in” effects for a cylinder oscillator in roughly 1 m/s flows and 2) analytical computations...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.