VB Language Research Articles

Simulation and Calculation for the Performance of an Air-conditioning Evaporator with Low Global Warming Potential Working Fluids

A distributed parameter mathematical model is set up for a finned tube evaporator under steady state, the actual flow condition is taken into consideration inside the evaporator in this model. Simulation program of the finned tube evaporator is written with VB language. Comparisons are also conducted between simulation results and data from experiment in the literature, the results show that the model has a good consistency. Based on this model, the characteristics of the flow and heat transfer of low global warming potential(GWP) working fluids R290, HFO1234yf and HFO1234ze in the finned tube evaporator are simulated. When the head-on wind speed, mass flow rate and pipe diameter size are altered, the change situation of heat exchange capacity and pressure drop are analyzed and the performance comparisons between the above low GWP refrigerants and the R410A which are now widely used are carried out. The results show that the R290 has the biggest heat exchange capacity and the HFO1234yf has the smallest under steady wind speed; HFO1234yf and HFO1234ze reach superheat state most easily in the same case. When the pressure drops are same, the mass flow rate of R410A is the maximum and the R290 is the minimum. When the heat exchange capacity is same, the mass flow rate of HFO1234yf is more than others and the R290 is smaller than the others. The model can provide theoretical basis for the optimization design and system matching of low GWP refrigerant finned tube evaporator and the refrigerant alternatives.

Research on Design Knowledge Retrieval Based on Matlab and VB Language

When developing new product, in order to shorten new product development cycle, to reduce the design cost, design engineers need to look for the existing design knowledge for reuse. In the process of reuse, the first thing to do is obtaining and searching design knowledge; then, excluding useless and not related knowledge; searching out the most similar case with new products, including basic parameters, the basic principle and so on. In this paper, Matlab is combined with VB language, and on the basis of similarity principle a case library is designed. It is easy for the designers to retrieve the required information. An example has been used to verify the effectiveness of the proposed method and the simpleness of operation.

Parametric Design System of Precision Forging Gear Die

Powerful function in three-dimensional design, SolidWorks now has found a wide range of applications in industrial design. The parametric design system of precision forging gear die in this paper is developed with VB language based on SolidWorks environment. It is described in detail that the establishment of important components of gear die in the three-dimensional model, the relation between parameters of the interface and model, and parameters drive mechanism. Input parameters in windows of VB interface, are automatically calculated the precise parameters of the gear part and geometric dimensions of the important components of the gear die. According to the input arameters, the three-dimensional model of the gear die’s assembly drawings is generated on SolidWorks environment. The parametric design system is able to shorten the time for constructing the 3D model of the precision forging gear die and improve the quality of the die design.

Traffic noise monitoring and simulation research in Xiamen City based on the Environmental Internet of Things

The Internet of Things (IoT) has many potential applications in the field of environmental monitoring. In this article, some hardware, including noise meters, ZigBee, and GPRS, were assembled and adjusted to get traffic noise data, which would be analyzed and compiled into a database based on the categories and characteristics of the data. Based on traffic noise data from 35 roads of nine green spaces in Xiamen, we used a back propagation neural network to practice net-simulation of noise data from 30 roads, while data from the remaining 5 roads were used as test data. Finally, the trained neural network was used to simulate traffic noise from 100 roads in Xiamen Island. Software systems using VB language and Flex network technology were also developed, and the simulation results were published on the Internet. The success of the method indicates that the Environmental IoT not only enables fast and effective acquisition of environmental data, but also enables accurate simulation and real-time network distribution.

“三软”煤层悬移支架工作面矿压显现规律研究

对国投煤炭郑州能源开发有限公司教学三矿15031工作面贯穿前后进行了矿压观测，通过编写VB程序对矿压观测数据进行处理，并使用统计分析软件对处理后的数据进行统计与分析。根据实测数据的统计值和绘制出的曲线图，确定了工作面贯穿前后的周期来压步距，研究了“三软”煤层工作面长度变化对矿压显现特征的影响。能够为矿山提供准确的数据资料，以指导生产中出现的工程问题。 Pressure observation was carried out at 15031 working face of Jiaoxue Mine in Dengfeng. The observation data were processed by programming with VB language, and then analyzed through statistical software. According to the statistical values and the graph, the step distances of periodical pressure around the connection of working face were defined, and the influence on the characteristic of pressure behavior with working face length was studied. The research provides accurate data for solving engineering problems in production.

Design of the Time Interval Generator Automatic Verification and Management System

This paper is aimed at the matter that verification method of time interval generator is still manual test, low efficiency, heavy workload, and for mechanical stopwatch calibrator can not be test because of lack of a machine / electrical converter. The author developed a machine/electrical switch, and programmed the automatic verification and management software using VB language, which realized the automatic verification and information management for various types of time interval generator. The machine/electrical switch is tested by NIM, the result show that the main indexes meet the design requirements. By practical application, the system has been working condition, which can be used as standard equipment of time and frequency parameter.

Mixed Programming Using FORTRAN and VB of Pipe Network for Heating and Air Condition Water System

As the scale of the air conditioning system is constantly increasing, some problems still exist and remain to be solved in the chilled water system. Among them, the leading problems lie in the insufficient research of the overall character on the user side and lack of simulation analysis. Corresponding calculating procedures are mixed programmed using VB and FORTRAN language to conduct to simulating analysis, to testify reliability and feasibility of the method.

Heat transfer analysis and experimental verification of cast heat exchanger

From the viewpoints of environmental conservation and energy efficiency, seawater-source heat pump system (SWHP) to provide district cooling and heating is applied in coastal areas. Based on the system, a heat transfer model was established for cast heat exchanger (CHE) adopted by SWHP systems. The CHE consists of pipes immersed in the seawater and used for transferring heat between the seawater and the heat exchanger pipes of SWHP system. An experimental study was carried out to test the validity of the model. A program was developed in VB language and the effects of inlet temperature, flow rate of the secondary refrigerant and length of CHE on the results were investigated. The results of the numerical simulation are in consistence with the experiments in both winter and summer conditions. As a result, application of SWHP systems with CHE in coastal areas in China is feasible due to the favorable geographical conditions and environment.

Mixed Programming Using VB and FORTRAN of Pipe Network for Heating and Air Condition Water System

Heating and Air Condition, Pipe Network, VB,FORTRAN,Mixed Programming Abstract:As the scale of the air conditioning system is constantly increasing, some problems still exist and remain to be solved in the chilled water system. Among them, the leading problems lie in the insufficient research of the overall character on the user side and lack of simualtion analysis. Corresponding calculating procedures are Mixed programmed using VB and FORTRAN language to conduct to simulating analysis, to testify reliability and feasibility of the method.

The Research of Nonlinearity Error Control on Five-Axis Machining Post Processor

Abstract：This paper analyses the causes and effective estimation method of nonlinear error; By machine tool motion solution, established a five-axis machine tool BV100 motion transformation mathematical models, combined with linear interpolation principle established the error compensation and nonlinear motion error model of the machine tool .by VB language, developed nonlinear error compensation function of special post process; and through the impeller cutting experiment validate the processor is correct and practical.

Research on Ergonomic Evaluation of Interior Design of ATC Cab

The rationality of spatial environment design and operational parts’ layout design in ATC (All Terrain Crane) cab needs to provide a quantitative basis through objective evaluation and analysis. In this paper, 3-D space model of ATC cab is constructed in accordance with data provided by a new type of ATC in a famous domestic crane enterprise, and the Chinese human database is established based on Human Dimensions of Chinese Adults(GB10000-88). Besides, the interior design ergonomic evaluation system of ATC cab is created by customizing specific toolbars and dialog boxes with VB language secondary development on CATIA software platform. This system can evaluate comfortable areas and reaching scopes of joystick, seat, pedal, steering wheel and other operating devices and give the evaluation conclusions. This provides a feasible and effective design evaluation method for computer-aided interior design of ATC cab.

Study on the Technics Principle for Stalk and Stubble Chopper Based on No-Tillage Planter

Several kinds of main stalk and stubble processing technologies and corresponding machines used in Liaoning Province are researched in this paper. The key parameters influenced stubble chopping are analyzed on the basis of understanding the principles of “ 2BISJ-2110 precision planter”. In order to solve the shortcoming of disturbing much soil and more power loss of“2BISJ-2110 precision planter” and achieve saving materials, reduce the cost and the water massive disappearing due to the agitation of the soil, entire stubble chopping is changed to seed line stubble chopping. Using the computer VB language to study the parameters of stalks and stubbles according to mathematical model about coulter ends and the path. In order to realize the narrow band and shallow treatment of the stalks and stubbles , taking single ridge width as 100-110mm and using the Solidwork software to design and draw rotary blade , L stubble breaking blade, cutter head ,blade holder , roller and so on . 2 kinds of feasible knife roll disposition plans are presented, which provides a design basis for new type narrow band rotary cultivation stalk and stubble chopper.

The Parametric Design of the External Transmission of Involute Beveloid Gear with Parallel Axes

Involute beveloid gear is one of the involute spur gears .It can be work with parallel axes, intersecting Axes, crossed Axes. Lateral clearance of the gear transmission backlash can be controlled by adjusting the relative axial position of involute beveloid gear transmission pair between two gears. It make a very small backlash or zero backlash .It can be used in backlash-free precision transmission .Its manufacturing is easy and its load capacity and transmission is high. In different cross-section with a different modification coefficient is its geometrical characteristics. The most important par of design involute beveloid gear is to choose a reasonable modification coefficient. In this paper, the beveloid involute gear's design process is introduced to choose its modification coefficient in satisfying various conditions, such as the gear teeth not to undercut, the addendum not to sharpen, guarantees coincidence degree. And uses the VB language to establish a design platform of the external transmission of involute beveloid gear with parallel axes .It is suit for project application. First，chooses modification coefficient by not to undercut, not to sharpen, guarantees coincidence degree.Next, compute the related geometry size. Third, according to the computed result, draws up the tooth profile curve in SolidWorks. Thus produces the gear's tooth profile or the socket gallery precisely, make gear's 3D modeling. It provides the basis for gear's optimization design and advanced manufacture. A new gear is rapidly established by change gear parameter in the designs platform. It can greatly raises r the efficiency and the precision of design involute beveloid gear, which provided the precise model for its dynamic simulation, the NC processing, the interference examination as well as the finite element analysis. Introduce the use method of design platform through a practical example confirms its usability.

Decision Support System of Regional Water Resources

It is very important to dispose the water resources rationally. Rational disposition of water resources is the nucleus of sustainable water resources utilization, and is the important way to solve the district water resource shortage and raises utilization efficiency of water resource. A decision-making variable model is established by groundwater, surface water and precipitation. Water resources managing decision support system in handan is developed on the language of visual basic, with the usage of database-access and the map-object GIS groups. And the system has the functions including managing function of data and files and editing function of images. During the model built, idea of decision-making variable deduction is adopted to transform three kinds of water to get the results of sustainable utilization of water resources. Finally Visual software is programmed Using GIS and VB language, and the rational blue print of water resources in this region can be decided applying optimized model . The system plays an important role in the water resources management.

Study and Application on Simulation and Optimization System for the Mine Ventilation Network

Abstract Aiming at the shortage of optimization software for mine ventilation system, such as insufficient function, poor universal property, cockamamie data input and bad visualization, etc., an all-purpose simulation and optimization software for mine ventilation system of underground mines was programmed by VB language based on SQL Server database and the 3d drawing software – SolidWorks. It has solved many problems such as mine ventilation information management, automatic drawing 3d mine ventilation stereogram, automatic calculating mine ventilation network and automatic noting ventilation network parameters, etc. It was proved to be excellently reliable, utile and prospect through application in several metal mines.

Research of Automatic Extraction of Human Dimensions Based on Hybrid Programming of MATLAB and VB

In the research of 2D anthropometry and application, the pattern design system of men’s pants developed by this paper has full capacity of automatic pattern design, which needn’t any manual operation. The system only needs body front and side photos of clients, and allows clients to change the pants style through the design interface so that pattern design can complete automatically. Automatic extraction of body size data is realizing by obtaining M document according to MATLAB program and transferring it. This paper is to translate body size extraction procedure to a document which can be directly transferred by using MATLAB software so as to realize automatic extraction of body size based on VB language. This is basic step of developing 2D anthropometry and application system which lay the foundation for auto-generation of paper pattern.

Design of Multimedia Courseware Sports Theory Based on Visual Basic

With the development of modern educational technology, multimedia courseware has become the new trend of educational technology. Multimedia courseware, in educational practice, has been the key to promoting multimedia-aided teaching. By means of using VB to write the physical theory, multimedia courseware can undoubtedly enrich and improve teaching quality. This paper, based on the VB language development environment, focuses on how to design physical multimedia courseware and discusses some key techniques in the process of courseware implementation.

The Predicted Model of Surface Roughness in Resharpening End-Mill for Tool Grinder

This paper presents a predicted model of surface roughness of radial relief for resharpening end-mill. This model is constructed using a polynomial network. The major factors affecting grinding parameters are considered to be wheel spindle speed, feedrate, and grinding depth of cut. Experiments under specified conditions are deliberately designed and conducted to obtain the corresponding tested data for surface roughness that are used for training data of the proposed polynomial network. Consequently, a predicted model for surface roughness is established. Furthermore, a computer program in VB language is written based on this model. It can quickly calculate predicted values of surface roughness by simply inputting required cutting parameters. According to the experimental results, the developed polynomial network model shows high predicting capability on surface roughness of radial relief, and possesses promising potential in the application of predicting surface roughness in resharpening end-mill operation.