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A control strategy using sliding mode variable structure control with an integral action is used for DSTATCOM. The steady-state error of compensation current control is effectively reduced, and the response speed is increased by the integral action. The control strategy has good robustness to parameter disturbance in both transient and steady states. The strategy uses sliding mode variable structure...
Two-dimensional planar modeling of stator of both traditional Screw drilling tool and the equal wall thickness of rubber of Screw drilling tool is set up with the 3D design software. Finite element analyzing modeling is set up as well, at uniformity pressure of inner surface of the stator rubber, regularities of distribution of the stress, the strain and the displacement are analyzed. And the results...
This paper proposed design proposal of wireless dam security information system through the GPRS technical superiority, introduced hardware system set up based on the GPRS dam security information system in detail, proposed the functional requirements of software modules, has the actual application value. Using the GPRS technology to carry on the network data transfer, easy to use, no region limit,...
In some particular area, such as large-scale distributed systems, especially in peer-to-peer (P2P) system, a small amount of nodes usually restrict the capability of the whole system heavily. These nodes are called ??Critical Nodes?? or ??Cut Nodes??. This paper is focus on the way of creating the system without the critical node. We regard the distributed system as an undirected graphic. At first,...
This paper investigates the wavelet transform and the principle and method of the noise reduction based on wavelet transform, chooses the threshold noise reduction, and discusses detailed the principles, features and design steps of the threshold method. Rigrsure, heursure, sqtwolog and minimaxi 4 kinds of threshold selection methods are compared qualitatively and quantitatively. The wavelet analysis...
This paper mainly focused on the theoretical studies of the linear rudder electric servo loading system. The mathematical model of motor servo loading system is established. Then, the disturbance force which would influence the system's dynamic performance is analyzed. In order to improve the accuracy of loading system, a feedforward-PID control algorithm is proposed. The algorithm can improve the...
The next generation mobile communication-4G will support high data transmission rate and high frequency efficiency. In order to satisfy the future requirements of wireless access systems, UWB, IMO, OFDM are the most competitive technologies in future wireless communication systems. This paper describes the use of adaptive modulated multi-input multi-output orthogonal frequency division multiplexing...
This paper uses analysis methods of saturated steam thermodynamics and fabric physics mechanics. Steam supply, formation, formation by pulling out wet, operating mode of steam thermal energy and condition of fabric stress were researched in physical process of fabric ironed. It Promulgated relationships between ironing pressure, pressure area, frictional force of fiber body, and contact area in condition...
Immune feedback Smith predictor is a model self-modified Smith predictor with immune feedback method. In the immune feedback algorithm, the difference between Smith predictor model and actual object model is seen as antigen, the antigen can produce antibody, and antibody can adjust the model of predictor simultaneously. The immune feedback Smith predictor shows good performance as traditional Smith...
The Mine Surveying work of Eastern River Bay has been using the traditional method of manual calculation and drawing, but it can not suit to modern surveying technology any more. This paper is doing a study of drawing digitization and measurement digitization of Mine Surveying, so as to solve the problem of mine surveying digitization. We use AutoCAD as a platform, Visual Basic as the programming...
Noise problem has a strong impact on the performance of sensor, especially in the field of aviation remote sensing. In this paper, the structure difference of CMOS and CCD image sensor is analyzed, and the noise affection and reasons are researched for CMOS image quality. Then the effective methods for each type of noise suppression are presented to improve the imaging capability. These researches...
With the popularization of mobile wireless networks in recent year, we can expect that the future mobile communication environments will be constructed from networks of different coverages and characteristics. The integration of WiMAX and femtocell technologies seems to be a feasible option for better and cheaper wireless coverage extension. It is well-known that WiMAX femtocells are currently under...
Probability Boxes and Demspter-Shafer Structures are new developing methods for handing with uncertainties. The methods are first used in machine fault diagnosis as a new information fusion method in this article. Contrasting the traditional power spectrum way, the result suggests that it is more efficient.
The precise pressure control in common rail will directly influence the performance of common rail diesel engine, so it is very important to control it effectively. Because common rail pressure was nonlinear, time-variable and disturbed, it is difficult to realize accurate pressure control with traditional control methods. Conventional PID control can not meet the demand of precise diesel common rail...
In order to determine the best stroke of pressure straightening process for Large-diameter pipe the pressure straightening process was analyzed with finite element analysis software for large diameter steel pipe in the depressed stroke of 10.0 mm-40.0 mm. The pipe plastic deformation law is revealed during the process of straightening. At the same time the maximum single stroke is determined. It provides...
To evaluate and forecast lifespan of hoist shaft by ANN (Artificial Neural Networks), an evaluation model based on forecast lifespan is set up. A new theme is proposed to forecast remaining life of hoist shaft in which the mutation in cross-section of the bending stress acts as an input unit and remaining life acts as the output unit on the different condition. In order to forecast remaining life,...
The Micro Electro Mechanical System (MEMS) gyroscopes are widely used in many applications for the compact size and low cost. However, since the MEMS gyroscopes usually have large drift which affects the measuring precision, we need to extract the trend of drift signal and eliminate the determinate trend to reduce the disadvantageous affection. Generally, gyro's drifts are a weak nonlinear and non-stationary...
In this paper, a novel intelligent optimization algorithm - Artificial Tribe Algorithm (ATA) is presented and discussed based on the analyses of the principle and uniform framework of the Bionic Intelligent Optimization Algorithms (BIOA). ATA simulates the existent skills of the natural tribes, and actualizes the optimization purpose through the propagation and migration behaviors of the tribes. ATA...
Current particle filter assumes that the dimension of state is known and constant and it fails when this suppose does not holds. This paper improves on the particle filter using RJMCMC. The improved particle filter can not only preserve the performance on the Non-Linear and Non-Gaussian condition, but also can be used when the dimension of state is unknown or changing over time. This paper uses the...
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