VB Language Research Articles

Study on Height Prediction of Water Flowing Fractured Zone in Deep Mines Based on Weka Platform

Accurately predicting the height of water flowing fractured zone is of great significance to coal mine safety mining. In recent years, most mines in China have entered deep mining. Aiming at the problem that it is difficult to accurately predict the height of water flowing fractured zone under the condition of large mining depth, the mining depth, height mining, inclined length of working face and coefficient of hard rock lithology ratio are selected as the main influencing factors of the height of water flowing fractured zone. The relationship between various factors and the height of water flowing fractured zone is analyzed by SPSS software. Based on the data mining tool Weka platform, Bayesian classifier, artificial neural network and support vector machine model are used to mine and analyze the measured data of water flowing fractured zone, and the detailed accuracy, confusion matrix and node error rate are compared. The results show that, the accuracy rate of instance classification of the three models is greater than 60%. The accuracy of the artificial neural network model is the highest and the node error rate is the lowest. In general, the training effect of the artificial neural network model is the best. By predicting engineering examples, the prediction accuracy of the model reaches 80%, and a good prediction effect is obtained. The height prediction system of water flowing fractured zone is developed based on VB language, which can provide a reference for the prediction of the height failure grade of water flowing fractured zone.

Electromagnetic design method of linear induction motor considering lateral end effect

Due to the complex end effect, it is difficult for the linear induction motor to design and analyze with the "road" calculation and two-dimensional field calculation. Considering the end effect, skin effect and secondary leakage reactance of the eddy current of the secondary induction plate, a linear induction motor electromagnetic design and calculation program was programmed via VB language. A two-dimensional finite element analysis method was proposed to approximate the lateral end effect on linear induction motor performance by multiplying the two lateral end effect coefficients into secondary induction plate resistivity and air-gap relative permeability. The accuracy for both calculation of end effect coefficients by "road" calculated program and considering lateral end effect in two-dimensional finite element analysis was validated by using the experiment and three-dimensional full model finite element, respectively. This work proposes the calculation method of the lateral end effect, which is faster and more accurate for the electromagnetic design as well as the finite element simulation of linear induction motor.

Design of 3D Simulation System for Natural Ignition Law in Gob Area of Multi-source and Multi-sink

In order to comprehend the law of spontaneous combustion in “multi-source and multi-sink” goaf of coal mine, and to provide the basis for the prediction of early fire in goaf, the division of three zones of spontaneous combustion in goaf and the formulation of technical measures for fire prevention and extinguishing, a three-dimensional simulation system of spontaneous combustion law in goaf of “multi-source and multi-sink” coal mine is designed in this paper. The system uses energy conservation equation, Fick‘s law and mass conservation law to establish multi-source and multi-sink goaf flow field, oxygen concentration field, gas temperature field and caving coal and rock temperature field coupled mathematical model. The model is solved and programmed by using VB language mathematical model, which realizes the visual display of simulation results. The system is used to simulate the II929 mined-out area of Luling Mine, and good application results are obtained. The system has good operability and improves the calculation efficiency. It provides theoretical support for the prevention and control of spontaneous combustion in goaf of “multi-source and multi-sink” working face.

Application of turbine generator in pipeline for transporting natural gas

Turbine generator is a kind of small power generation equipment widely used in drilling, military and other fields, but there is no practical application in pipeline for transporting natural gas at present. In this paper, the working principle and technical characteristics of turbine generator are expounded, indicating that the way of using the kinetic energy of natural gas transported in the pipeline to convert to mechanical energy to generate electricity has a good prospect in engineering application. Based on design theory of turbine blade and VB language programming, 3d blade model is established. CFD software is used to simulate the flow field of the blade, and the distribution of velocity and pressure in the single periodic flow path of stator and rotor is obtained, providing feasible technical means for testing turbine hydraulic performance in practical engineering.

Meshless method simulation and experimental investigation of crack propagation of CBM hydraulic fracturing

For simulating CoalBed Methane (CBM) hydraulic fracturing using 3-D meshless method, this paper analyzed the hydraulic fracturing mechanism and cracking form for coal rock and established the geometric and mathematical models of hydraulic fracturing propagation in coal rock in terms of the Hillerborg model on crack opening displacement theory. With the theoretical basis of hydromechanics, the formulas for calculating hydraulic pressure inside the fracture by numerical simulation were deduced from the analysis on this fluid-structure interaction problem. The geometric and mathematical models established above were described by 3-D meshless Galerkin (EFG, Element-Free Galerkin) method and compiled into the numerical simulation program using VB and FORTRAN programming language to simulate the fracture propagation for an actual coal rock sample with a drilling hole as an example. Then the physical simulation experiment of hydraulic fracturing propagation of coal seam was conducted on the same coal rock sample. Through the direct observation with naked eyes and detection by advanced instruments of ESEM and Micro-CT, the shape and parameters of cracks on the surface of and inside the coal rock sample were achieved, which indicated that experimental results are reasonably consistent with numerical simulation results.

Experimental Study on Pitching Motion Mode of a SWATH-USV

The importance of the research about ship motion model has become more prominent with the improvement of economic level. Mastering ship motion model is a necessary basis for studying ship's divisibility. The hydrodynamic parameters obtained by parameter identification methods are more precise, which is dissimilar from the parameters obtained by classical methods. In this paper, a SWATH-USV was taken as the research object to accomplish a series of pitch decay tests on the condition that the SWATH-USV was in different drafts and tilts angles in the hydrostatic state. And a mathematical model by the method of system identification based on genetic algorithms has been established, adopting VB language to program a systematic identification software. With this, the author obtained the pitch motion differential equations, and the changing regularities of hydrodynamic coefficients with draft and initial tilt angle of the model in different drafts and initial tilt angles and their kinematic equation. Using this equation to predict, the results are proved to be well matched with the experimental results. And the feasibility of the identification method is also confirmed. The analysis results and methods can provide essential technical support for the in-depth analysis of the wave resistance and the design of the boat.

The Design of Software for Three-Phase Induction Motor Test System

The design and development of control system software is important to three-phase induction motor test equipment, which needs to be completely familiar with the test process and the control procedure of test equipment. In this paper, the software is developed according to the national standard (GB/T1032-2005) about three-phase induction motor test method by VB language. The control system and data analysis software and the implement about motor test system are described individually, which has the advantages of high automation and high accuracy.

Dynamic Response Analysis of the Straddle-Type Monorail Bridge\u2013Vehicle Coupling System

An analytical procedure of dynamic interaction analysis of the straddle monorail bridge–vehicle coupling system is proposed in this paper based on the finite element method and energy method. The calculation procedure is programmed with VB language for the solution of the governing motion equations of the straddle-type monorail bridge–vehicle coupling system. The effects of speed, three kinds of loads and different radius of curvature on dynamic responses of the monorail bridge–vehicle coupling system are analyzed. The simulation indicates that vertical vibration amplitude of the track beam decreases while the lateral amplitude increases with the increase in the radius of the curvature; the maximum value in lateral and vertical direction is 0.075 and 0.43 mm, respectively; and the maximum amplitude (lateral and vertical) and acceleration (lateral and vertical) are 0.69, 0.046 mm, 0.15 and 0.62 m/s2, respectively, at the speed of 80 km/h. The vibration amplitude (lateral and vertical) and vertical acceleration increase with the increasing load, and the maximum values are 0.041, 0.43 mm and 0.44 m/s2, respectively. The lateral acceleration is not easily affected by the load conditions.

The Research on Curriculum Group of Computer Programming Based on CDIO

Computer Programming and related courses account for a large proportion in current information courses. Such courses typically include C/C++ language programming, VB language programming, Java language programming, C # language programming, data structures and algorithms. There are many common aspects in terms of knowledge points among programming courses. However, currently, the courses are taught separately. Furthermore, under the trend of shrinking time allocation and declining number of courses in undergraduate curriculum, it is critical to maximize the use of limited hours of programming courses to enhance teaching effectiveness. Based on inquiry-based teaching model in accordance with CDIO teaching philosophy, it is proposed in this paper to conduct programming curriculum group construction. Therefore, knowledge of program design courses within the group will be shared and courses instruction within the group will be coordinated. Knowledge sharing facilitates its application to experiments and projects, which can improve students’ comprehensive capabilities, especially their ability to solve practical problems.

Determination of the Reaction Rate Constant for the Opposing Reaction by Integral Method

In order to calculate the forward reaction rate constant and the reverse reaction rate constant of the opposing reaction, a calculation program was designed with VB language. According to the law of mass action, the reaction rate equation was established and it was converted into integral expression, the experimental data are calculated by using variable step size trapezoidal quadrature and least square method. The accuracy of the program in numerical simulation was verified by an example; the results show that the calculated values are in good agreement with the literature values. Inputting different parameters, the program can calculate the reaction rate of different types of the opposing reaction. It is convenient, quick and accurate to calculate the rate constant of the opposing reaction by the program. The program can be used as a tool in studying the opposing reaction.

DEVELOPMENT OF AN AUTOMATIC MEASUREMENT AND MATCHING MACHINE FOR COLUMNED BATTERY CELLS

An automatic measurement and matching machine for columned batteries is developed in this study. The automatic machine consists of a battery feeding case, an intermittent separation feeding mechanism, a test region, eight classification transport channels, and battery depositary boxes. Besides the mechanism design, a human-machine interface and control program are written in VB language. The program provides the control and monitoring program for the auto-measurement system. The program cannot only read the measurement data and control the automatic machine, but also store these data and provide the test data histories for each cell supplier to the user. The experimental results show that the automatic machine could examine and classify the columned battery cells efficiently and decrease the demand of manpower. The results also show that the total measured and sorting quantity of one machine for eight hours is about 5760 pieces, which is greater than the 3500 pieces measured by one manpower.

Implementing a wind measurement Doppler Lidar based on a molecular iodine filter to monitor the atmospheric wind field over Beijing

A wind measurement Doppler Lidar system was developed, in which injection seeded laser was used to generate narrow linewidth laser pulse. Frequency stabilization was achieved through absorption of iodine molecules. Commands that control the instrumental system were based on the PID algorithm and coded using VB language. The frequency of the seed laser was locked to iodine molecular absorption line 1109 which is close to the upper edge of the absorption range,with long-time (>4h) frequency-locking accuracy being ≤0.5MHz and long-time frequency stability being 3.55×10−9. Design the continuous light velocity measuring system, which concluded the cure about doppler frequency shift and actual speed of chopped wave plate, the velocity error is less than 0.4m/s. The experiment showed that the stabilized frequency of the seed laser was different from the transmission frequency of the Lidar. And such frequency deviation is known as Chirp of the laser pulse. The real-time measured frequency difference of the continuous and pulsed lights was about 10MHz, long-time stability deviation was around 5MHz. When the temporal and spatial resolutions were respectively set to 100s and 96m, the wind velocity measurement error of the horizontal wind field at the attitude of 15–35km was within ±5m/s, the results showed that the wind measurement Doppler Lidar implemented in Yanqing, Beijing was capable of continuously detecting in the middle and low atmospheric wind field at nighttime. With further development of this technique, system measurement error could be lowered, and long-run routine observations are promising.

Numerical wave tank based on a conserved wave-absorbing method

Recently the numerical wave tank has become a widely-used tool to study waves as well as wave-structure interactions, and the wave-absorbing method is very important as its effect on the quality of waves generated. The relaxation method and the derived momentum source method are often utilized, however, the damping weight is constant during calculation and repeated trials are required to obtain an acceptable wave-absorbing effect. To address the abovementioned issues, a conserved wave-absorbing method is developed. The damping weight is determined by solving the mass conservation equation of the absorbing region at every time step. Based on this method, a two-dimensional numerical wave tank is established by using the VB language to simulate various waves by which the validation of this method is evaluated.

Study on Identification of Damage to Wind Turbine Blade Based on Support Vector Machine and Particle Swarm Optimization

<div class=""abs_img""> <img src=""[disp_template_path]/JRM/abst-image/00270003/03.jpg"" width=""340"" />Classification results of SVM-PSO</div> In order to identify two failures of crack damage and edge damage to wind turbine blade, a damage identification system was designed by acoustic emission technique. This system took advantage of wireless technique for signal collection and transmission and upper computer for receiving and processing data. This system adopted acoustic emission sensor, NRF905 wireless transmission, upper computer designed by VB language, and the serial communication function of VB for data receiving. Data was firstly normalized after being received. Then, the energy features of data were abstracted by db wavelet. With the abstracted features, support vector machine model was established and verified, and the machine parameters were optimized by particle swarm optimization. Results show that the system is reliable in data collection and transmission, and the correctness of damage identification obviously increases by optimizing the support vector machine with particle swarm. The design provides method to monitor the status of rotating object, so this system can provide model base for subsequent studies.

Automatic Test System for Frequency Response Characteristics of SAW Device

To solve complex measurement and difficult remote operation in the test for frequency response characteristic of SAW device, an automatic test system for frequency response characteristic of SAW device based on vector network analyzer is proposed. The system consists of the vector network analyzer, the crossover cable, the computer, the fixtures and the SAW device. The user interface of test system is developed with the VB language. By means of calling the VISA-COM library, the SCPI commands can send to the vector network analyzer. Many functions of the automatic test system for frequency response characteristic of SAW device include the settings of measurement parameters, the measurement calibration, the data storage, the data display, the data transmission, the marker analysis and the data output. By the actual measurement of a SAW device with the center frequency at 101.764MHz, the experimental results show that the transmission loss of SAW device is-27.532dB, and the reflection loss is-7.715 dB.

Research on Key Technology of CAD for Crystal Lamp with Planar Distribution

Crystal lamp has been preferred in indoor lighting design because of its gorgeous effect of light. Crystal lamp has many same or similar elements in the structure, so using CAD technology can help designers to quickly design and model crystal lamp. In this paper, the planar distribution of crystal lamp has been divided into two kinds of situations such as the concentric form crystal distribution and the rectangular form crystal distribution. Aiming at each situation, mathematical analysis has been done and the pseudo-code been given respectively. Then a parameterized modeling plug-in for crystal lamp aided design based Rhinoceros platform has been developed by using VB language. By selecting the parameters and variables, the plug-in can automatically create 3D model of crystal lamp, thus realize the parameterized modeling and improve the efficiency of design.

Power Spectrum Analysis Based on VB Language

Power spectrum analysis is one of the important part of digital signal processing, various characteristics of the main signal in the frequency domain, is designed based on the limited data and extract the useful signal is submerged in the noise in the frequency domain. In this paper, the VB language to realize the power spectrum analysis can extract the useful signal was drowned in noise in frequency domain based on power spectrum, frequency structure and physical meaning analysis reflected the more obvious, monitoring and diagnosis in rotating machinery fault, power spectrum analysis is very wide.

Modal Analysis of Vibration and its Program Development in Power Transformer Core

In this paper, based on the modal analysis combined with power transformer product structure, using the empirical formula calculation method and finite element simulation analysis software calculates the natural vibration frequency of power transformer core, respectively, while making the VB language as a tool to develop the calculation software of natural vibration frequency of power transformer, provides a strong support for product tenders, design and optimization.

Implementation of Electric Data Sheet Based on Virtual Instrument

To solve the problem of the incompatible and interoperable in complex system configured by different buses or transducers, the paper introduced the IEEE1451 standard protocol, the transducer electric data sheet specified in the standard was analyzed in detail. On the basis, a smart sensor module was designed based on FPGA, TEDS specified in IEEE1451.2 were designed, data of transducers were filled in and downloaded in graphic and programmable VB language. Adopting intelligent TEDS in IEEE1451.2 standard improves the system performance, cost-effective and versatility, making the complex system be developed more easily, data processing simple.

Implementation of Electric Data Sheet Based on Virtual Instrument

To solve the problem of the incompatible and interoperable in complex system configured by different buses or transducers, the paper introduced the IEEE1451 standard protocol, the transducer electric data sheet specified in the standard was analyzed in detail. On the basis, a smart sensor module was designed based on FPGA, TEDS specified in IEEE1451.2 were designed, data of transducers were filled in and downloaded in graphic and programmable VB language. Adopting intelligent TEDS in IEEE1451.2 standard improves the system performance, cost-effective and versatility, making the complex system be developed more easily, data processing simple.