Virtual Instrument Technology Research Articles

Multi-Channel Eddy Current Detector Based on Virtual Instrument Technology and Self-Balancing Technology

In order to reduce the complexity of software and hardware design in multi-channel eddy current testing, a multi-channel real-time eddy current testing system based on lock-in amplifier technology and self- balancing technology is designed. The system uses graphical programming language platform (LabVIEW), Myrio1900 data acquisition control card and lock-in amplifier as key components. The lock-in amplifier adopts the lock-in technology to detect the amplitude and phase of the weak eddy current signal. The Myrio1900 card outputs multiple analog switch control signals and collects the amplitude component of the weak eddy current signal. The LabVIEW platform uses self-balancing technology to eliminate the imbalance of the bridge itself. The detection system realizes the real-time and reliable display of the amplitude and XY components of the 6-channel eddy current signal. Experimental results show that the designed system has a detection width of 56.00 mm at one time, and can detect artificial grooves with a covering layer of 2.90 mm. The artificial grooves have a width of 1.00 mm, a depth of 1.00 mm and a length of 50.00 mm. The system design process described in the article can be used as a reference for equipment developers and can also be used for educational purposes.

Design of Test Platform for Thorium-based Molten Salt Reactor Protection System

This paper summarizes the characteristics and test requirements of the thorium-based molten salt reactor protection system, and proposes a test platform design for the fourth-generation thorium-based molten salt reactor (TMSR) protection system. It mainly includes system design, hardware selection, software design and system interface. Based on the Producer-Consumer software architecture built by virtual instrument technology, the test platform uses the NI PXI hardware platform to realize channel testing, functional testing, online debugging and other functions. This design can fully test and verify the protection system without the process system, and can be extended to test other reactor-type protection systems or monitoring systems.

Research on the application of virtual instrument technology in simulation training

In orde to improve the space launch capability, the virtual instrument of the ground test equipment of the measuring system is studied by using the LaBVIEW technology in view of the present situation that there is no actual training equipment for measurement system in the emission field. A suit of virtual instrument for ground test equipment is developed to meet the requirements of daily post training. By analyzing the composition, function and working principle of the simulation training platform, this paper designs the system structure, simulation members, communication protocol and simulation flow of the simulation training platform, which can be used to complete the unit test, subsystem test, integrated test and fault disposal of the aircraft. The test operator can use the virtual instrument to have an intimate knowledge of the test flow, the operation steps, the test status, the fault disposal measures and other work contents. It can effectively improve the training level and test ability of the test operator in the emission field measurement system.

A novel test rig development for experimental study of fluid mechanics of hydraulic orifice and/or gaps under high or low temperature conditions

To meet the demand of ever operating in extreme environments of modern high-end vehicles or machineries, it is meaningful to perform basic research on fluid mechanics of hydraulic orifices and/or gaps under high or low temperature conditions. In this study, a novel compact experimental module which integrates the oil, the oil supply mechanism, the testing damping valve with orifices and/or gaps and several sensors was proposed, the experimental module has avoided the bulky method of using a full hydraulic system for oil supply and can be wholly placed into a high/low temperature chamber to undertake experiments; Based on the integrated experimental module, a test rig employing a variable-frequency-motor-driven ball screw driver to excite the testing module was developed. By using the virtual instrument technology, the hardware and software of automatic measurement and control system was further developed, so the automatic control and data collection of the test rig was realized. Final results show that the test rig can conveniently perform fluid mechanics experiments for various hydraulic orifices and/or gaps under high or low temperature conditions with high efficiency, so the test rig can be a very good platform for pertinent basic research works.

Software Design of High Precision Filling Test System Based on LabWindows / CVI

Filling technology has a large number of applications in the chemical, food, pharmaceutical and other industries. Filling repeatability is an important indicator in the field of flow measurement. Because of its powerful data analysis capabilities, virtual instrument technology is playing an increasingly important role in the field of automated detection. This paper designs the host computer software based on LabWindows / CVI for a high-precision filling test system. LabWindows / CVI combines a powerful and flexible C language platform with professional measurement and control tools so it can realize the requirements for designing filling system software. The main functions of the software are hardware communication, data acquisition and processing, and export of test results then a user-friendly interface is designed. This article explains the basic program design process, data structure and introduces program functions. The software can run stably and can provide filling test solutions for different test devices.

Design and Development of a Virtual System for Measurements and Analysis of the Respiratory Sounds for Diagnosis of Respiratory System

Respiratory problem is one of the most common health problems occurring in Saudi Arabia due to the continuous changes of the weather in addition to surface winds that cause dust during all seasons yearly. The most affected people especially children and elderly in addition to the adults with respiratory problems such as asthma. Such problem needs emergency care as soon as it occurred. The goal of our research is to develop a compact respiratory diagnostic system using advanced signal processing that can be used remotely via the virtual instrumentation technology to help accurately diagnosis at early stages of respiratory diseases. It can also overcome the lack of expert physicians in rural regions and some urban clinics or health centers. The proposed system will be implemented using Virtual Instrumentation (VI) that consists of computer, microphone with simple analog circuit, digitizer and LabVIEW software. VI has been designed for easy measurement and analysis. In addition to that, it has features and ability to control the whole system of acquisition, play, display, processing and advanced analysis of the different acquired respiratory signals. Respiratory signals obtained from our system are analyzed for diagnosis purposes using advanced signal processing techniques to the analysis of respiratory parameters using time and frequency domains. The obtained results can be displayed and printed in a report format including acquired respiratory signal, filtered signal, extracted segment for selection of phase, power spectral density, and analyzed respiratory parameters for diagnosis purpose. The developed system is successful and achieved its purpose based on the tests performed with real respiratory signals of normal and abnormal cases that proved to be efficient system while dealing with many respiratory problems conditions.

Research on the application of virtual instrument technology in simulation training

This paper analyzes the feasibility of the application of GL Studio3.2 and Vega Prime2.2 software in combination, explores the application mode in the simulation system, and gives the call method of GL Studio3.2 control. Proposed by passing a pointer address way to deliver complex data types, with the method of window messaging to avoid the waste of time slices, with the method of thread messaging without window messaging method of thread.

Modern instruments and technologies for measuring random signal characteristics

Based on modern computer technologies developed by National Instruments, a virtual device has been developed to adjust, control and study noise characteristics of various radio-electronic devices. Examples of distribution laws for random signals based on smoothness or sharpening, asymmetry and uncertainty were provided. It is shown that the method identifies the laws of distribution of random signals in comparison with other methods, and the virtual instrument technology and the electronic device with a data acquisition board monitor the technical state of electronic devices by their noise characteristics.

Vacuum Switch Contact Position Detection Based on Labview

Arc shape of vacuum switch is one of the main influencing factors of the breaking performance of vacuum switch. The contact opening distance directly affects the development of arc shape. How to accurately detect the real-time position of the contact and calculate the contact distance is of great significance. Therefore, based on Labview virtual instrument technology, a software and hardware system for real-time position detection of contacts for vacuum interrupter is designed. The system collects the arc image during the vacuum switch opening process by high-speed camera, and then uses the virtual instrument development platform Labview as the programming software to process the arc image and analyze the edge features. Finally, the edge information detected is used for fitting, to realize pinpoint of the moving and static contacts. The experimental results show that the detection system can accurately detect the real-time position of the contact. It has the characteristics of high detection efficiency, stable operation and easy operation. The detection results provide technical support for analyzing the vacuum switch arc shape.

Experimental Research of Displacement Sensor Based on Virtual Instrument Technology

In order to create a kind of wide-ranged and nanoscale accurate displacement measurement which requires low manufacturing costs and has strong anti-interference capabilities and stable performance, the nanometer time-grating sensor based on AC electric field coupling has been researched. Functions like the settings of the frequency, amplitude and phase of standard waveform can be achieved by combining the LabVIEW software of virtual instrument development platform with the hardware of the PXI-5422 arbitrary waveform generator from NI company. The experiment concludes that phase adjustment can improve the accuracy through adjusting the amplitude of excitation signal which can avoid the effect that the different installation sites have on nanometer time-grating. The virtual instrument technology applying in the experiment of nanometer time-grating gives technological support to the improvement and progress of the function of excitation signal, which provide convenience to the research on the sensor.

Application of Virtual Instrument Technology in Condition-based Maintenance of Chemical Equipment

Application of Virtual Instrument Technology in Condition-based Maintenance of Chemical Equipment

Power Quality Monitoring and Energy Efficiency Management of Microgrid based on wind-PV-ES Hybrid System

With the vigorous development of new energy power generation technology, the use of a large number of power electronic components and non-linear loads seriously threatens the power quality of microgrid systems. Therefore, it is necessary to monitor the power quality parameters Therefore, it is necessary to monitor the power quality parameters during its operation in real time so as to maximize the use of energy resources. This article focuses on the overall design of the microgrid power quality monitoring system. In the hardware design part, this paper uses two chips of DSP and FPGA to collect, process and analyze the signals of the power grid. Mainly includes the system overall design idea, the signal conditioning module design, the digital signal processing circuit, the communication port circuit and so on. Based on this, combined with the virtual instrument technology, designed and completed a micro-grid power quality inspection platform based on Labview. This paper also establishes the reactive power compensation scheme of the microgrid TSC system by using Matlab/Simulink software, further improves the power quality and power factor of the operation, and verifies the power quality improvement scheme of the microgrid through simulation.

Investigation on high rotational speed calibration device

This paper presents the novel implementation of a high rotational speed device for optical tachometer calibration based on brushless DC coreless micro motor and FPGA technology at National Institute of Metrology (NIM), China. The structure of the device and key technology involved were described. The dual closed-loop control solution was explained. For control algorithm, virtual instrument technology is used to build up FPGA hardware from National Instrument and calibration software developed by Lab VIEW. Some calibration results of a laser tachometer are shown in the measurement range from 40000 to 99999 r/min. The expanded calibration uncertainty is 1 × 10−4, k = 2. This high rotational speed calibration device is the first successful technical realization of the measurement unit of r/min (RPM) with resolution of 1 r/min for engineering applications in China and, therefore, used as an important working standard at NIM for the feasible traceability of high-precision optical tachometers national wide at high measurement range above 40000 r/min.

Design and Realization of Rotating Machinery Conditions Monitoring System Based on LabVIEW

Abstract: Nonlinear dynamic analysis of rotating machinery system has always been the hot spot of the rotational dynamics research. This article sets up a rotating machinery condition monitoring system to realize the measurement of system dynamic characteristic parameters based on NI(National Instruments) virtual instruments technology. The measurement of vibration signal of rotating machinery system is achieved by using NI company general data acquisition module of NI Company. Meanwhile, by analyzing and processing the acquired data using LabVIEW 2012, the dynamic characteristics, such as .the speed of the rotating machinery system, the axis trajectory, spectrum parameters, are attained. The measurement results show that the rotating machinery condition monitoring system based on LabVIEW is easy to operate, easy to realize the function extension and maintenance, and that it can be used in the industrial engineering projects with rotation characteristics. LabVIEW as the development tools used by virtual instrument function is very powerful data acquisition software products support is one of the features of it, so using LabVIEW programming and data acquisition is simple and convenient.

A Design and Application for 3D printer based on Virtual instrument

In recent years, the application and design of 3D printer has received extensive attention. In this paper, a virtual instrument based 3D printer is designed. Firstly, a printer platform with a box structure is built, then virtual instrument technology is used to construct the control center, after that data acquisition card is applied to combine them together to form a complete 3D printing system. The experiments show that the designed 3D printer is effective in printing 3D products.

A web-based virtual experimental platform for the course of automatic control principle

In the environment of expansion of college enrollment, the current teaching resources cannot satisfy the requirements of students’ learning, which greatly restricts the students' learning interest, especially in the course of automatic control principle. With the development of computer technology and virtual instrument technology, the emergence of virtual laboratory not only provides a beneficial supplement for the traditional experiment, but also extends the experiment without limitation of time and space. Based on the concept of virtual laboratory, a virtual experiment platform is proposed for the course of automatic control principle by applying B/S network architecture and Mysql database in LABview software. The realizations of virtual experiment platform such as remote network design, interface design, basic and innovative experimental contents are further studied in this paper. This virtual experimental platform can provide network remote access for students and offer an online environment for teachers to check experimental results. This platform has completely broken the traditional experimental model and helps students to cultivate creative ability. The characteristic of excellent openness and flexibility can ensure adding new function for future education development in this platform. Further to the observation of the teaching effect of this platform applied in the Nanfang College of Sun Yat-Sen University, students are more willing to accept the automatic control principle course combined with virtual experimental platform.

Detection and analysis of wheat storage year based on electronic tongue and DWT-IPSO-LSSVM algorithm

Abstract: The electronic tongue system based on virtual instrument technology was used to qualitatively analyze the wheat, which achieves rapid and objective evaluation analysis of aged wheat with different storage years. In view of the complex output signal of the electronic tongue and the large amount of data, the Discrete Wavelet Transform was used to extract the eigenvalues of the original data to reduce the data dimension size. On this basis, the improved particle swarm optimization algorithm was used to optimize the parameters of Least squares support vector machine, and the analysis model of wheat storage age was established. The experiments exhibited that the DWT-IPSO-LSSVM model had better classification performances than other pattern recognition models, such as DWT-GA-LSSVM, DWT-AF-LSSVM and DWT-PSO-LSSVM. The results showed that the accuracy of the training set, the accuracy of the test set, overall classification accuracy and Kappa coefficient of the proposed combined model in this paper were 95%, 92%, 91% and 0.88 respectively. This research indicated that the electronic tongue system combined with proposed model can be used to identify and discriminate the aged wheat with different storage years. Keywords: electronic tongue, wheat storage year, discrete wavelet transform, improved particle swarm optimization, least squares support vector machine DOI:  10.33440/j.ijpaa.20190202.46.  Citation: Guo T T, Yang Z W, Miao N, Zhang X, Li Q S, Guo J, Wang Z Q. Detection and analysis of wheat storage year based on electronic tongue and DWT-IPSO-LSSVM algorithm.  Int J Precis Agric Aviat, 2019; 2(2): 19–24.

Complex Virtual Instrument Model for Ocean Sensor Networks

Virtual instrument (VI) technology is widely used, because it is more cost effective to perform data processing with computer software than with an additional hardware. Traditional VI developments often suffer from low efficiency due to the complex programming and poor interoperability. In this paper, we analyze the data management and analysis requirements of the ocean sensor networks (OSNs), identify the common characteristics of different systems, and propose complex VI model for OSNs (CVI-OSNs). It consists of an object description model to interpret the observation data, a VI model to enable comprehensive analysis of observation data, and a parameter mapping model to associate observed variables and VIs. The presented design method of CVI-OSN systems improves the development efficiency significantly and enables system interoperability. On this basis, a CVI-OSN composition model is proposed to facilitate data integration among different systems for large-scale research of ocean environment variation. The proposed model has been fully applied in the IEEE standard 2402. Moreover, we have conducted practical experiments to evaluate its performance. The result shows that our proposed model is feasible and efficient.

Технология применения виртуальных приборов для комплексной диагностики судового электрооборудования

Технология применения виртуальных приборов для комплексной диагностики судового электрооборудования

Application of Virtual Instrument Technology in the Teaching of "Signal and System"

Application of virtual instrument technology can effectively solve the problem of "signal and system" teaching, which is abstract and closely linked with mathematics. Based on the analysis of the current situation of the course and characteristics of virtual instrument technology, the key points and difficulties in teaching content are summarized, typical experiments through classroom teaching are researched, and the LabVIEW simulation results are introduced with an example from signal analysis.