Advanced Materials Research Vols. 694-697

Abstract: In this paper, a novel approach based on time-frequency atom decomposition is presented to recognize the radar emitter signals. To decompose the signals into a linear expansion of time-frequency atoms, a fast matching pursuit (MP) algorithm, which is optimized by composite differential evolution (CoDE) algorithm, is introduced. The feature vectors of radar emitter signals are extracted based on the atoms generated in the process of decomposition. The Directed Acyclic Graph SVM (DAGSVM) is selected as the classifier to classify the feature vectors of different radar emitter signals.

Abstract: The detection device of combustible gas are designed in the presented work,using wireless transceiver and GSM network.The system realize the wireless transmission of the gas concentration,and also can send alarm information to user’s mobile when an exception occurs. The system consists of two parts: a master and slave. The function of the slave is to collect data, process data and transffer the data to the master. The task of the master is to receive data and display it by LED. The signal acquisition is completed by sensor TGS813 and A/D converter TLC2543. The wireless transmission is achieved through wireless transceiver nRF905. Since the accuracy of the sensor is affected by the environment, using DS18B20 to achieve temperature compensation. And with wireless communication module TC35i and GSM network platform, we can send the alarm information to user’s mobile promptly.

Abstract: Using the elementary theory of the acousto-optic nonlinear interaction,an empirical formula is developed for the diffracted light in terms of the acoustic power. Using this formula, closed-form expression, in terms of the modified Bessel functions, are obtained for the diffracted-light components resulting from interaction with a multisinusoidal acoustic wave.

Abstract: The present paper is devoted to the issue of the monitoring and technical diagnostics systems of 35-110 kV substations equipment. The primary task of this paper is to prove the possibility of using the system analysis data of technical diagnostics equipments for the integral estimation of substation equipment in cases there is no possibility to establish a monitoring system for technical, economic or other reasons. As an example, an analysis of state of electrical equipment and the technical diagnostics data of real large load center are performed. In this paper the main data analysis methods of technical diagnostics are presented.

Abstract: Project the lateral restricted vehicle system to establish a safe and efficient vehicle driving stability control test system. Aimed at Chery A3 car, based on Matlab/Simulink, establish the lateral restricted vehicle dynamic simulation system. Used the braking and driving integrated ESP control strategy, separately analyze the ESP control performances of the independent vehicle system and the lateral restricted vehicle system on three test conditions including neutral steering, under steering, over steering. The research results indicate that the ESP control performances of the lateral restricted vehicle system and the independent vehicle system have great uniformity on the three test conditions, provide a basis for the vehicle driving stability control test research.

Abstract: Design the structure of the vehicle system for overturning prevention and set up the system dynamic model. Based on the Matlab/Simulink, establish the dynamic simulation system of the vehicle system for overturning prevention for the Chery A3 car. Using the brake / drive integrated ESP control principle, based on the simulation model, respectively simulate and analyze the ESP control performances of the vehicle system and the vehicle system for overturning prevention on different simulation conditions. The study results indicate that when there is no ESP control or ESP control system failure, the vehicle system for overturning prevention can simulate the ESP control performances of the vehicle system effectively, the ESP control performances of the vehicle system and the vehicle system for overturning prevention have remarkable consistency. The theory of the vehicle system for overturning prevention for the ESP control performances test provides a basis for the vehicle stability control performance research.

Abstract: In order to diagnose single soft fault in analog circuit, the particle swarm neural network was applied to fault diagnosis of analog circuit. The particle swarm neural network training process was divided into two steps. Firstly, BP network weights and threshold values as the position vector of the particle, used PSO algorithm searches for a near-optimal position vector as BP neural network initial weight values and thresholds. Secondly, used the BP algorithm to further optimization based on the initial weights and thresholds, got the optimal network weights and threshold value. The training method can improve the convergence accuracy and learning speed of the network training. The simulation results show that this diagnostic method can effectively achieve the accurate diagnosis of analog circuit soft fault.

Abstract: Embedded CPU in traditional magnetic flux leakage detection system was used as the master controller. CPU is serial processor, which making it difficult to collect the large amounts of real-time data. While FPGA has the advantages of high integration, high speed processing, parallel processing. FPGA is applied to magnetic flux leakage acquisition system to solve data acquisition problem. It comes up with the designs of a multi-channel magnetic flux leakage signal selection control module, A/D conversion module and communication module in VHDL language on QuartusII. The experimental results show that each module of the magnetic flux leakage acquisition system based on FPGA can meet the requirements, and can correctly collect magnetic flux leakage signal, convert and transmit data. Design of FPGA-based is programmable in the field, magnetic flux leakage collection system can be flexibly designed for different occasions, and has independent intellectual property rights.

Abstract: At present, the Lithium-ion battery are the most used batteries in a large number of applications because of its high performances. It is important for Lithium-ion battery to make objective and accurate judgment to its performances before the practical application. A multi-channel high precision Lithium-ion battery test system, which could realize complex measure control, was designed in this paper. The system consists of upper computer (PC) and lower computer (control circuit unit). The communication between upper computer and lower computer is through RS-485 bus. The control circuit unit, which is mainly composed of micro-processor, control circuit, data acquisition circuit and protection circuit, can realize the function of testing Lithium-ion battery performances such as charging, discharging, internal resistance. Furthermore, based on actual use conditions it has shown that the system can accurately measure various Lithium-ion performance parameters and the current measurement accuracy can satisfy the test requirements.

Abstract: t is known that dynamic speckle patterns can be used to identify the temporal evolution of an active sample and some desired properties of the sample may therefore be detected via the dynamic laser speckle analysis. Mathematically understand the structure of sample surface which gives arise to the dynamic speckle patterns is crucial to the analysis. In this paper, a simulation model of the dynamic speckle patterns for plant leaves is proposed. The developed model is derived from the principle of coherent electromagnetic wave scattering off a randomly textured and time varying surface and is demonstrated via the simulation of dynamic speckle patterns of a fresh unattached leaf surface along the true laser speckle measurements. Both simulated and true measurements of the dynamic speckle patterns of the leaf are analyzed via several statistical techniques and a consistent agreement between the results of the two is observed. The proposed statistical model is helpful to gain the insight of the relationship between speckle dynamics and the activity of the leaf surface which is supposed to be an measurement of plant water stress and water status.