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 mainly studies the angle tracking problem in electronic throttle system with unknown time-varying disturbances. Firstly, generalized proportional integral observer (GPIO) is used to estimate the time-varying disturbances including model uncertainties, friction torque and spring initial torque. Secondly, a composite controller combining disturbance estimation and backstepping control method...
Current control of IPMSM servo system is investigated in this paper. Under the field-weakening control framework, nonlinear couplings of the voltage equations are very strong. The current control performance may not be well until such nonlinear couplings are well dealed. In this case, a DOB-based model predictive control is proposed to improve the current control performance under field-weakening...
Almost all of the fish have the ability to recognize the underwater environment, among of which current forecasting is very critical for the movement of fish as well as an underwater vehicle. Perceiving water flow is inspired by the study on lateral line system of fish, and pressure sensor array is utilized to perceive changes in pressure of water. Due to the high dimension of sensor data, it is necessary...
In this paper, we propose a way of synthesizing realistic images directly with natural language description, which has many useful applications, e.g. intelligent image manipulation. We attempt to accomplish such synthesis: given a source image and a target text description, our model synthesizes images to meet two requirements: 1) being realistic while matching the target text description; 2) maintaining...
A direct-type lead exit for ultra high voltage (UHV) transformer was designed, and the electric field of the lead exit was calculated and analyzed by using finite element method. Then, its insulation structure was optimized. The stress distribution and displacement of the lead exit under vibration condition were investigated. The reliability of the lead exit was verified by electrical test and vibration...
The novel three-phase rotary transformer is an attractive solution to replace the brushes and slip rings of doubly fed induction generators. The interaction of magnetic field produced by primary windings and rotating secondary ones makes it difficult to establish the dynamic mathematical model of the transformer. This paper presents the design procedure and finite element analyses of the novel three-phase...
In order to settle the problem of obstacle recognition for Unmanned Surface Vessel (USV), a novel method is presented to distinguish between vessels and coastlines based on point cloud data (PCD) from ship borne laser radar. Primarily, echo data of inland river targets and noise is analyzed and filtered. Furthermore, targets are extracted from PCD based on distance. Subsequently, three robust target...
By analyzing the defects of existing task mapping algorithms, this paper proposed a novel fault model based on spare core technology, and a fault-aware low power-dissipation dynamic task mapping algorithm FLDMA is designed based on NoC system fault, power dissipation and system performance. In the algorithm design, this paper presented the minimum mapping area selection method, designed the first-node...
With the growth of Android platform malicious application, the seperation of malicious application from nonmalicious application has become challenging. In recent years, a combination of static analysis and dynamic analysis of the idea is very popular. However, it is very costly for dynamic analysis to achieve high coverage. In this article we present an efficient, lightweight and behavior-based architecture...
This paper highlights the operating performance of oil-immersed transformer in extreme cold environment along with the researches on the moisture variations in oil-paper insulation system and its effects on transformer caused by ambient temperature. As one of the main factors that affect the electric strength of oil-paper insulation, the effects of moisture on electric strength for oil and oil immersed...
The impact of DC current on excitation characteristic of transformer is analyzed under bipolar asymmetric operation of HVDC power transmission system. The operating performance of single-phase transformer with three-limb core located near DC grounding pole is measured, and the relationship of vibration, noise and oil temperature of the transformer with such parameters as unbalance degree of HVDC bipolar...
The ever increasing of display resolution on mobile devices raises high demand for GPU rendering details. However, the challenge of poor hardware support but fine-grained rendering details often makes user unsatisfied especially in calling for high frame rate scenarios, e.g., game. To resolve such issue, we propose BUTTERFLY, a novel system which collaboratively utilizes mobile GPUs to process high-quality...
This paper presents a DSP-based sliding mode controller of the planar switched reluctance motor (PSRM) for precision positioning applications. The mechanical structure, control scheme, and the design of sliding mode controller are presented and analyzed, respectively. The DSP-based sliding mode controller is implemented for the PSRM experimentally. The steady-state positioning errors of x- and y-axes...
In this paper, a line-of-sight(LOS) guidance law with nonlinear adaptive side-slip angle compensation for 2D path following under external constant disturbance is proposed. When the vehicle follows path on the ocean, the vehicle is exposed to the constant ocean current, and which drags the vehicle away from the desired path. So a nonlinear adaptive compensation line-of-sight guidance law is proposed...
Force of friction, which blocks tendency of object's motion or relative motion can easily lead to low tracking accuracy of manipulator arm driven by PMSM at low speed or in back-and-forth m ovement. During the robot positioning, the gravity torque changes all the time. The variation of it is difficult to measure, Which have influence on the control accuracy of the manipulator arm. The traditional...
This paper presents a steady performance analysis of an isolated three-phase self-excited induction generator which employs a three-phase winding in series connection with two capacitors and supplies for single-phase load. Performance analysis is derived by the method of symmetrical components, from which the input impedance of the generator can be determined. The voltage unbalance factor is computed...
Exponential growth of media generated in online social networks demands effective recommendation to improve the efficiency of media access especially for mobile users. In particular, content, objective quality or general popularity are less decisive for the prediction of user-click behavior than friendship-conditioned patterns. Existing recommender systems however, rarely consider user behavior in...
A novel approach of Doppler spectrum reconstruction based on iterative adaptive algorithm (IAA) for Multi-Input Multi-Output Synthetic Aperture Radar (MIMO SAR) is proposed. Firstly, the mathematical representation of the ambiguous Doppler spectrum is established, and the relationships of the Doppler signals among different transmit-receive pairs are derived. Based on the derivation aforementioned,...
Fiber reinforced plastics (FRP) have been widely used as composite insulator inner rod material due to its excellent mechanical properties. In practice, composite insulator suffers from many kinds of environmental, electrical and mechanical stresses, such as discharge, pollution and liquids ingress. Under normal circumstances, the FRP rod is covered with the silicone rubber sheath, so there is no...
Software Defined Networking (SDN) is a novel architecture, which is suitable for managing and controlling networks in a centralized way with global view, and can provide more effective and fine-grained resource allocation for routing management. Compared with traditional wireless mesh network (WMN), the SDN-based WMN (SDN-WMN) can guarantee the Quality of Service (QoS) more effectively. In this paper,...
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.