The current test system for electrical parameters of relay, mainly with the 51 series MCU as the central processing unit, peripheral components are various, running speed is limited, and judging the failure of relay o...
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ISBN:
(纸本)9781467377249
The current test system for electrical parameters of relay, mainly with the 51 series MCU as the central processing unit, peripheral components are various, running speed is limited, and judging the failure of relay only rely on testing the contact resistance exceeds the standard or not, testing parameter is single. Foreign technology on research and development of test system for relay's electrical parameters is mature, but the cost is higher. Thus, in this paper, we study a kind of test system for relay's electrical parameters with STM32 MCU as the central processing unit, which can realize to test the relay's electrical parameters such as coil resistance, contact resistance, suction voltage, release voltage, suction time, release time, arc time and so on. This paper mainly discusses the design principle and hardware structure, finally obtained test data by the experiment, the data show that the test system has the advantages of fast running, stable performance, simple design, and has a certain market value.
A dual-band low noise amplifier (DBLNA), which can operate at 2.4 GHz and 5.8 GHz, is designed and realized. Infineon BFP740 SiGe HBTs are chose as active device, the cascode structure with high isolation and wider ba...
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Network survivability is the key ability of ad hoc network under all kinds of attacks, which is a foundation to the design and evaluation of wireless ad hoc network routing protocol. The definitions of network surviva...
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To improve the accuracy and efficiency of coal and gas outburst prediction, the principal component analysis was combined with radial basis function neural network for the prediction of the situation of coal and gas o...
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ISBN:
(纸本)9781479965762
To improve the accuracy and efficiency of coal and gas outburst prediction, the principal component analysis was combined with radial basis function neural network for the prediction of the situation of coal and gas outburst in this paper. The impact factors of coal and gas outburst in a coal mine are the object of the study. Principal component analysis method was used to extract the principal component factors, and then the large contribution of three principal components was selected to replace the original nine factors, with the main ingredient as an input parameter radial basis function neural network. Coal and gas outburst is divided into four levels to build predictive models of coal and gas outburst. 16 outstanding groups of typical samples of the neural network prediction model were selected for training, and three groups of testing samples were tested with trained neural network prediction model, with results showing that projections are consistent with the actual situation.
In the face of complex scenes, single-modal dominant classification tasks encounter limitations in performance due to insufficient information. On the other hand, joint classification of multimodal remote sensing data...
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This article introduces an efficient solar charging system based on FPGA. The charging circuit composed of BUCK-BOOST switch converter, realizes the function of maximum power point tracking(MPPT) of solar cells by usi...
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In order to solve the problem of complicated Non-Uniform Rational B-Splines(NURBS)modeling and improve the real-time performance of the high-order derivative of the curve interpolation process,the method of NURBS mode...
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In order to solve the problem of complicated Non-Uniform Rational B-Splines(NURBS)modeling and improve the real-time performance of the high-order derivative of the curve interpolation process,the method of NURBS modeling based on the slicing and layering of triangular mesh is *** research and design of NURBS curve interpolation are carried out from the two aspects of software algorithm and hardware *** on the analysis of the characteristics of traditional computing methods with Taylor series expansion,the Adams formula and the Runge-Kutta formula are used in the NURBS curve interpolation process,and the process is then optimized according to the characteristics of NURBS *** can ensure accuracy,and avoid the calculation of higher-order ***,the hardware modules for the Adams and Runge-Kutta formulas are designed by using the parallel hardware construction technology of Field Programmable Gate Array(FPGA)*** parallel computing process using FPGA is compared with the traditional serial computing process using *** and experimental results show that this scheme can improve the computational speed of the system and that the algorithm is feasible.
According to the image reconstruction accuracy influenced by the "soft field" nature and the limited projection data in electrical capacitance tomography, based on the working principle of the electrical cap...
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According to the image reconstruction accuracy influenced by the "soft field" nature and the limited projection data in electrical capacitance tomography, based on the working principle of the electrical capacitance tomography system, a Novel image reconstruction algorithm based on compressed sensing is proposed in the paper. The method based on ART (algebra reconstruction technique) organically combines the gradient sparse of image and ART, and reduces the norm of image gradient with full-variational method, and improves the accuracy and speed of image reconstruction. Experimental results and simulation data indicate that the imaging accuracy is markedly improved, and the image is closed to the *** new algorithm presents a feasible and effective way to research on image reconstruction algorithm for Electrical Capacitance Tomography System.
Power dissipation during testing has been found to be much more than during normal mode due to increased switching activity. Test vector reordering technique helps mitigate this problem as it enables the reduction of ...
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Considering from test time, test power and access, this article adopts new method that LFSR reseeding based on syncopation of some test patterns. In a test set, some patterns have a lot of confirmed bits and are hardl...
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ISBN:
(纸本)9787121113154
Considering from test time, test power and access, this article adopts new method that LFSR reseeding based on syncopation of some test patterns. In a test set, some patterns have a lot of confirmed bits and are hardly encoded by LFSR. They are syncopated and substituted by generating patterns. This method can reduce the number of seeds and improve the utilization of seed so that achieve the purpose of test data compression. Using in the benchmark circuits, experimental results show that it can better improve the compression rate and reduce the cost of test.
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