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In this paper, an improved control strategy (ICS) based on the duty ratio modulation, by properly matching the positive voltage vectors with the new zero voltage vectors (ZVVs), is proposed in direct torque control (DTC) of brushless DC motor (BLDCM). The traditional voltage switching table for the six switches of the converter is modified according to this strategy to minimize the torque ripple....
This paper investigates a fixed-time anti-unwinding attitude controller for spacecraft. With the use of rotation matrix, unwinding problem, which widely exists in controllers based on quaternion can be dealt with. By means of a fixed- time sliding mode surface, the desired attitude command can be tracked in a fixed time, the bound of which can be estimated without knowing any information of the initial...
Two sliding-mode based fault tolerant control schemes are proposed for attitude dynamic tracking problem of re-entry reusable launch vehicle (RLV) under actuator fault, unknown uncertainty, external disturbances, and input limitation. Firstly, the mathematical model of reentry RLV with loss of actuator effectiveness fault is presented. Then, a novel control algorithm is provided for stable control...
In this paper, based on the characteristics of polar codes, a new decode-and-forward strategy called generalized partial information relaying protocol is proposed for degraded multiple-relay networks with orthogonal receiver components (MRNORCs). In such a protocol, with the help of partial information from previous nodes, each relay node tries to recover the received source message and re-encodes...
Currently, the requirements of service quality in the electric power data network are getting higher and higher, and traffic prediction is an important premise to promote service quality. In order to accurately predict the total traffic of communication channels, a Multi-Applications Comprehensive Traffic Prediction (MACTP) model is proposed in this paper. Differing from F-ARIMA and S-ARIMA models...
Frame rate up-conversion (FRUC) is a widely used technique to enhance the visual quality of low frame rate video presented on liquid crystal displays. One decisive factor for an effective FRUC algorithm is to obtain true motion vectors (MVs) for motion compensated interpolation. However, many current block-based motion estimation methods cannot always provide reliable MVs. In this paper, a new FRUC...
Micro-grid is the technique which could access the utility grid with combined renewable energy generation resources, loads, energy storage devices and control devices. It is generally agreed that, Micro-grid could reduce or avoid the impact of wide range failure to the users and improves the power supply reliability. This paper proposed a Monte Carlo method to evaluate the reliability of Micro-grid...
To permit the growth of robotic systems into new applications, e.g. rehabilitation, wearable (exoskeleton) and domestic/service robots, new actuators that can safely interact with humans and environments are greatly required. This paper designs a pneumatically powered actuator that has intrinsic compliance, and is able to extend and bend. A discretization method is utilized to model the continuum...
The suitability of different turbulent models for journal bearings needs to be analyzed from both their static and dynamic performances. In this paper, based on experimental results and theoretical results under different turbulent models, including Ng-Pan, Philip Aoki, Constantinescu and Hirs model, that which turbulent model is appropriate to analyze the static and dynamic performance of large power...
In this paper, a thermoelastohydrodynamic model for tilting-pad bearing is developed. In our proposed model, the study of temperature field is characteristicly focused on the temperature change along the film thickness direction, and thermal-elastic deformation is calculated based on assumption that the pad is a cantilever beam. The model is described with the generalized Reynolds equation, the energy...
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