Virtual Instrument Technology Research Articles

Linear Motor Intelligent Control System Based on LabVIEW

In order to realize the industrial computer can control automatic adjustment of linear motor, design the linear motor control scheme based on virtual instrument technology. System driven by the control card of GE series, based on the LabVIEW development platform, realizes the intelligent control of linear motor.

The Equal Precision Measurement Data Processing System Based on Virtual Instrument

During quantitative analysis on measured object by using equal precision measurement method, there remains certain difference between the measuring result and truth value due to the impact on measuring method, measuring tools and measuring environment. In order to reduce measurement error, we usually make continuous equal precision measurements on the measured object repeatedly. Then we get the final result by theoretical calculations, error analysis and dispose on measurement data. The data processing shows complicated and error-prone .But now we take computer as a carrier, then combining with virtual instrument technology to accomplish the data-processing system. It can cover the manual computation shortage and can take humanization disposal on measurement data. Moreover, the results can show with multi-mode intuitively.

Design of Data Acquisition System of Vibration Signal for Civil Engineering Structure

A vibration signal acquisition system was designed based virtual instrument technology. The process and principle design of structure vibration signal acquisition system based on LabVIEW software and CompactRIO hardware were discussed in detail. Finally, system test was conducted by a three story steel frame structure. And the test results were compared with traditional instruments system. The experiment showed that the data acquisition system of structure vibration signal which based on CompactRIO is precise and reliable in measurement results, and can realize multi channel synchronous data acquisition, storage, and support the real-time online data filtering and spectrum analysis and so on.Compared with the traditional platforms, the system proposed in the paper has short development cycle, low cost, user-defined functions, rugged, portable and other advantages. It can be widely used in complex and special building environment, so it will have a broad application prospect in the field of SHM.

The Research of Data Privatization Based on Cloud Wisdom Remote Monitoring System

The cloud wisdom remote monitoring system, based on advanced data acquisition device/server/browser architecture, combines the virtual instrument technology, embedded technology, the Internet technology and cloud computing technology. The system includes three parts: a front-end data acquisition hardware which has the Internet access, the back-end cloud computing center and mobile terminal which is in the hands of the operator. In this system, the test data is in the cloud computing center. Taking account of data security and privacy, this paper proposed the solution of data privatization, mainly by establishing a private customer data server which has the mutual access with the cloud computing center to preserve the original test data in the cloud wisdom remote monitoring system.

Detecting System of Crop Disease Stress Based on Acoustic Emission and Virtual Technology

A system for detecting the conditions of crop disease stress by acoustic emission technology was studied and developed .The PCI-2 acoustic emission board and R15 acoustic emission sensor probes were chosen to construct the hardware detecting system, and the AEWIN software and virtual instrument technology were utilized to construct the software system, a real-time acquisition and detecting system for the information between acoustic emission and disease stress of crop was established. The results show that there are a certain physiological cycle laws in the acoustic emission of healthy crop, generally the “double peak area” can appear; but distortion can occur in the acoustic emission of disease stressed crop, a sharp increase of the acoustic emission frequency can suddenly take place at some time, immediately the crop begins to show disease symptoms, and acoustic emission signals lose the regularity.

Implementation of Automatic Test System Based on Virtual Instrument Technology and USB Structure

A distributed ATE based on Virtual Instrument technology and Universal Serial Bus is introduced in this paper. This system is used for on-the-ground testing of a certain equipment of the space craft, to measure its power supply, signal, communication and etc. Because of the advantage of USB being used, this system provided an adaptive test bench for various testing requirement and can be well advanced in testing function.

Research of Multiplex Smart Responder Design Based on the Virtual Instrument Technology

In this paper, introduces a multiplex smart responder based on the virtual instrument technology. The programming language Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) is used and the NI Educational Laboratory Virtual Instrumentation Suite II (NI ELVIS II) platform is chosen as target device in designing this responder. The control kernel of this responder is LabVIEW program, it can realize lots of functions, such as adjusting question time and answer time, etc. The experiment proves, this responder is advantageous to have short design period, high reliability, easy operation and maintenance, and be helpful for user in the field of virtual instrument technology.

Research on Signal Acquisition and Analysis System Based on Virtual Instrument Technology

In this paper, we used Lab VIEW development platform, designed a virtual signal acquisition and analysis system based on the soundcard. In addition we studied the signal acquisition performance of it. This system has functions of signal acquisition, analysis, waveform display and storage. It is easy to use with good interface, and function appending is available on user requirement. It offers a kind of DAQ solution with low cost. It has broad application prospect, can be extended to the field of speech recognition, ambient noise monitoring and laboratory measurement etc.

Design and Implementation of Data Management System for Low-Voltage Electrical Performance Test Based on Virtual Instrument Technology

Low voltage electrical apparatus is the electrical appliances which play the role of on-off, control or protection in the circuit of AC voltage to the 1200V, DC voltage to1500V. The function of it will have a direct impact on the safe and reliable operation of the power system and industrial control system. It is needed to carry out an accurate test on the each function of them before they leave the factory. In order to ensure the accurate of the test data, it is worth studying on how to build a test data management system for low voltage electrical apparatus. Through LabVIEW establish a connection to the Access database technology. An independent data management system is developed.

Design and Implementation of the Multi-Functional Virtual Instrument Based on LabVIEW

According to the rapid development and widespread application of virtual instrument technology, a design with serial port and the audio card of PC as the main hardware and LabVIEW as the software development platform is proposed. Not only can it generates and output basic waveform, arbitrary formula wave and hand-painted waveform in real time, but also realizes the function of the oscilloscope system, including: channel selection, collecting and display waveform data in real-time, parameter measurement, spectrum analysis etc. This multi-functional virtual instrument has the advantages of friendly-machine interface, easy to transplant and modify and good scalability. And it has broad prospects in the field of testing, measurement and teaching practice.

Research of Broken Wire Rope Detection System Based on LabVIEW

In this study, we introduce how to detect broken wires in steel rope based on wavelet transform and virtual instrument technology. By means of the powerful data analysis function of virtual instrument and wavelet transform, the singularity of wires can be found and it could help to improve ability of locating broken wires and determining breakage grade.

Development of Automobile Gear Motion Error Detection System

Dynamic precision measurement of transmission error involves many subjects such as optical, mechanical and electrical and computer at the forefront of technology has very important significance in the production. In order to achieve the accurate testing of motion error automobile gear, convenient and quick to obtain the gear tooth form error parameters, this paper research and design of the automobile gear error motion detection based on virtual instrument technology system, can accurately test automation, including visual inspection process, real-time detection information, read the data measured parameters, the analysis of characteristic curve, and other functions.

Rotating Equipment Vibration Monitoring and Analysis System Based on Virtual Instrument

In order to meet the user requirements of the rotating equipment vibration monitoring upgrade project, a distributed vibration monitoring & analysis system based on virtual instrument (VI) technology was developed, which can monitor vibration for multiply equipments and provide a lot of vibration analysis graphics. The system keep use of the old monitoring instrument, from whose BUFFER port or serial port the vibration signals can be collected, thus the upgrade expense is deduced and the upgrading is calm. The using of Lab Windows/CVI software platform not only makes the displaying interface to be similar with the old instrument panel and easy to use for operators, but also greatly shorten the time of development. In this paper, the architecture and the software function implement of the system are introduced. The system has been preliminarily tested in field and the results show that it is feasible and has good practicability.

Engine HIL Signal Imitation Design Based on LabVIEW

In the development and test of engine ECU, HIL is used widely .ECU needs a lot of drive signals in order to ensure HIL can work normally. Mixing programme based virtual instrument technology and Matlab / Simulink model realized engine signal simulation to provide drive signals for ECU. Meanwhile, NI PXI boards which output analog signal were used as hardware devices in the paper and LabVIEW software were adopted to drive boards and process analog signal, achieving accurate simulating signal on engine excitation signal. The results for test show that the system is able to simulate exciting signal for the engine ECU accurately, provides a low-cost, low pollution, high efficiency way to test and develop engine and its ECU and increase security and reliability of test system.

The Design and Implementation of Automatic Fire Extinguishing and Explosion Suppression System's Testing Equipment

According to the automatic fire extinguishing equipment requirements for explosion suppression platform system, this paper using the flexible neural tree and the clonal selection principle, describes the creation method of flexible neural tree model, embedded virtual instrument technology, to solve the nonlinear system fault diagnosis problem, realize the fire (explosion) detection system control components, improves the diagnostic sensitivity and accuracy. After the trial, the equipment illustrates high integrity, good versatility and high stability.

IEC standard based virtual wind turbine mechanical load test system

In order to conduct a systematic test over the mechanical load of the wind turbine, load measurement principles and methods have been studied according to the International Electro- technical Commission (IEC) standard, and wind turbine test scheme has been proposed. Combined with modern virtual instrument technology, a practical and reliable system for wind turbine mechanical load test has been developed. In addition to collecting various wind turbine parameters, the system can also yield a series of curves and charts ruled by IEC standards such as the capture matrix, the relation between load and wind speed, the equivalent load and load spectrum.

Design and Implementation of Digital Circuit of Multi Level Experimental System Based on LabVIEW

In order to meet the need of modern experimental teaching, improve experiment of openness and flexibility. Constructing digital circuit experiment system, fully embodies the virtual instruments in experimental operation of the advantage based on the virtual instrument technology, LabVIEW. Through the analysis of digital circuit experiment in actual effect of virtual instrument technology, shows the digital experiment system more simple and convenient, and some characteristics of relative stability and performance and experiments small errors and use convenient and save costs etc,so can be widely used in experiment teaching. Not only expanded experiment scope and space, but also can exert students' initiative and creativity.

LabVIEW-Based Design of Virtual Instruments and R&G of Virtual Experimental System

With the popularization of network technology, the computer technology is developing rapidly coupled with the emergence of virtual instrument technology. In this context, virtual experiment, an effective complement to the development of the traditional experimental method, has very broad spectrum of application in the field of education, measurement, and even other research areas. Thus, virtual experiment has become an important future development of experimental teaching. Based on analysis of the history and current status of the existing virtual laboratory at home and abroad, as well as the technologies used to accomplish a virtual experiment, this thesis makes a comprehensive study to analyze the construction of the virtual experiment system, including the basic theory of its establishment, the network environment, application classification, the specific tectonic model and technical methods and its development and applications.

Weak Signal Detection and Application in Electronic Experiment Based on Virtual Instrument

Base on the virtual instrument technology, a micro signal measurement system was established and applied to the electronic teaching experiment. It is composed of PC, oscilloscope, signal generator, ac constant current source, low noise preamplifier and tested operational amplifier, etc. it can complete the measurement of uV weak voltage, uA weak current measure, wires and printing plate conductor resistance and inductance, amplifier open-loop amplitude frequency and phase frequency characteristics, and so on many aspects of modern electronic measurement experiment content. The system not only has the characteristics of functional diversity, measurement accuracy, and good graphic interface, simple operation and overcomes the shortcomings in the course of electronic technology experiment teaching, and play an important role on improving the experimental conditions,reducing the cost of experiments, raising the level of classroom teaching and practice of teaching.

Research on the Dynamic Model and ECU HIL Simulation System of Electronic-Controlled Engine

An ECU hardware-in-loop simulation system for electronic-controlled engine in better real-time and augmentability is built. We establish a dynamic average model of the electronic-controlled engine and put emphasis on analysing its fuel and oil slick modelmass flow model of intake manifold air and the sub-model of inlet manifold pressure. The engine model has fewer parameters and lower orders in order to adjust and set parameters; We propose a building program based on virtual instrument technology and adopts the chip TMS320F2812-DSP to design a signal interface system used to achieve the simulation for sensor signal and the collection of ECU output signal. Through the verification of simulating experimental data, it's proved that the established model of electronic-controlled engine has suitable steps and good real-time performance, building a good foundation for further experimental design and research in the future.