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In order to accurately control the portable AUV, a dynamic modeling method based on computational fluid dynamics (CFD) and a improved Generalized Predictive Control (GPC) method were presented. First, the whole modeling process was described from two aspects: dynamic model derivation and model parameter identification. Second, the validity of the model and modeling method were tested by comparing...
Depth-averaged ocean current plays a significant role in marine scientific research, in particular, which is valuable for the navigation of underwater gliders. In this paper, we study the estimation and forecast of depth-averaged ocean current using underwater gliders. By considering three factors: the seawater density difference, the pressure hull compression deformation and the unstable depth intervals...
Underwater vehicle is an important tool in the exploration, survey and investigation of the ocean and have many scientific, military, and commercial applications. To develop an underwater vehicle is not an easy task; a reliable underwater vehicle requires a thorough system design and many costly field tests during which system specifications can be validated, and these field tests can be hard and...
Chassis plates are mainly used in marine atmospheric environment and play an important role in protecting the internal components from disruption and extending the life of equipment. This paper took coating material (Model: TB06-9+TS70-1) as the test object and studied the main failure mechanism. It was found that Hinderliter model could be the main performance degradation indicators according to...
The protective properties of organic coatings for internal applications of plane cabin are generally evaluated by means of accelerated degradation laboratory tests, including electrochemical techniques. The coatings are stressed by different mechanical, chemical, thermal loads and the effects on the protective properties can be measured by using well established electrochemical techniques, like electrochemical...
In this paper, we propose a hybrid FUZZY P + ID controller to stabilize the towing cable tension between a cable ship and a burying system. First, we develop the model of a winch system driven by valve-controlled hydraulic motors and evaluate the step responses yielded by the conventional PID and the proposed FUZZY P+ID controllers using simulations. The comparative studies show that the control performance...
This paper discusses electric field under overhead lines with a nearby building. Surface charge method is used. Planer triangle surface charge element is chosen. Electric potential and electric field strength produced by a planer triangle surface charge are presented. And analytical expression is deduced. Then electric field of 220kV double circuit overhead lines with a nearby building is calculated...
Based on the traditional neutral salt fog test, a newly step-stress accelerated degradation test is designed which adds temperature as a step-stress condition. It is proved that the test process is accelerated obviously. The degradation data measured from insulation resistance of printed circuit board could be fitted into degradation curves. Using Arrhenius Equation to build temperature accelerating...
Three-North Shelterbelt Program (TNSP) has been implemented in China since 1978 to increase forest coverage, control soil and water loss, and improve environment. Monitoring ecological management could provide the effect of the program and form the information base upon which sound planning decisions were made. The paper monitored forest resources and soil erosion on one example of Zhongyang County,...
According the universal serial cyclic redundancy check (CRC) technology, one of the new CRC algorithm based on matrix is refered, which descibe an new parallel CRC coding circuit structure with r matrix transformation and pipeline technology. According to the method of parallel CRC coding in high-speed data transmiting, it requires a lot of artificial calculation. Due to the large amount of calculation,...
Using techniques developed by Kuznetsov to discrete-time systems, we study the stability of the equilibrium and Neimark — Sacker bifurcation (also called Hopf bifurcation for map) of a tri-neural network system. The theoretical analyses are verified by numerical simulations. Our results have potential applications in neural networks.
Given the time series quarterly data of China from 1993 to 2006, we apply the SVAR model to analysis the effect of oil shock on GDP and price index of China and the monetary policy the government should take facing oil shock. The empirical result shows that the effects of oil shock on inflation and GDP are asymmetry, central bank can decrease the interests and put in currencies to regulate the macro...
The static var generator (SVG) with appropriate control method is a good solution to solve the problem of reactive power impact and harmonic pollution which is generated by the nonlinear load. In this paper, a control strategy using active current separation and the current indirect control is used for SVG. The active current separation is a method for detecting the harmonic and reactive current,...
When monitoring spatial phenomena, we are not just interested in measurements at sensed locations but also at locations where no sensors were placed. To estimate the scalar field where no sensors are deployed, we need to interpolate the data. This paper shows how sampling schemes can be optimized by minimizing the integrated Kriging variance based on known covariance (variogram). We propose two approaches...
The identification process of the classical Preisach model which is based on a neural network approach is presented. The fundamental idea of this approach is to identify Preisach function by training a neural network with a set of loops whose identification function is already known. The suggested identification approach has been numerically implemented and carried out for a fast tool servo system...
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