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ตวอยางการสราง VI โดยการจาลองสญญาณทางไฟฟา แลวทาการวเคราะหและประมวลผล
1. สรางสญญาณโดยใชการจาลองสญญาณจาก Simulate Signal และกาหนดพารามเตอรตามท
ตองการโดยในตวอยางนจะสรางสญญาณ Sine Wave
รปท 2-14 การเลอก Simulate Signal
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รปท 2-15 การกาหนดพารามเตอร
2. จากนนทาการสรางกราฟเพอแสดงผลทไดจากเครอง Simulate Signal โดยการคลกขวาท
output ( ลกศรชออก )ขางคาวา Sine จะไดกราฟทตอออกมาจาก Simulate Signal และทหนา Front Panel
จะไดกราฟทแสดงผล
รปท 2-16 การสรางกราฟ
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รปท 2-17 กราฟแสดงผลจาก Simulate Signal
2.5 งานวจยทเกยวของ [1]Jun-Long TANG, Rui-Nian XU, Huan-Guang CHEN, Tian-Jian SHEN, De-Ming LI, Virtual instrument for controlling and monitoring digitalized power supply in SSRF, Nuclear Science and Techniques, Volume 17, Issue 3, June 2006, Pages 129-134, ISSN 1001-8042, http://dx.doi.org/10.1016/S1001-8042(06)60025-0. (http://www.sciencedirect.com/science/article/pii/S1001804206600250) Keywords: LabVIEW; Digital power supply; Virtual instrument; SSRF; PWM; TL503.5 Abstract The Shanghai Synchrotron Radiation Facility (SSRF) needs extremely precise power supplies for their various magnets. A digital controller is being developed for the power converters of the SSRF power supply (PS). In the digital controller, a fully digital pulse-width modulator (PWM) directly controls the power unit insulated gate bipolar transistor (IGBT) of the PS. A program in Lab VIEW language has been developed to control and monitor the digital PS via serial communication (RS232) from a PC and to modify its parameters as well. In this article, the software design of the virtual instrument for controlling and monitoring digitalized PS and its associated functions are described, and the essential elements of the program graphical main-VI and sub-VI source code are presented and explained. The communication protocol and the structure of the developed system are also included in this article. [2]Zhang Mingle, Yun Jintian, Jin Guoguang, Liu Gang, System on Temperature Control of Hollow Fiber SpinningMachine Based on LabVIEW, Procedia Engineering, Volume 29, 2012, Pages 558-562, ISSN 1877-7058, http://dx.doi.org/10.1016/j.proeng.2012.01.003. (http://www.sciencedirect.com/science/article/pii/S1877705812000136) Keywords: LabVIEW; Temperature controller; Transducer; RS485 communication
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Abstract In this paper, temperature controller and transducer are applied to the system for temperature control of hollow fiber membrane based on LabVIEW software. By rs485 communication, temperature and rotational speed are monitored and controlled in real time. And the communication instruments are introduced. Some combined units are used to reduce the system response time. Combining LabVIEW software with serial communication technic, the automation level of hollow fiber spinning machine and the sensitivity of date acquisition and monitoring is greatly improved. [3]Alan S. Morris and Reza Langari, Chapter 5 - Data Acquisition with LabVIEW, In Measurement and Instrumentation, edited by Alan S. Morris and Reza Langari, Butterworth-Heinemann, Boston, 2012, Pages 115-133, ISBN 9780123819604, http://dx.doi.org/10.1016/B978-0-12-381960-4.00005-X. (http://www.sciencedirect.com/science/article/pii/B978012381960400005X) Keywords: Data acquisition systems; computer-based measurement; PC-based data acquisition; LabVIEW programming; virtual instruments; data flow programming; graphical programming languages Summary This chapter is designed to introduce the reader to the concept of computer-based data acquisition and to LabVIEW, a software package developed by National Instruments that is used extensively in laboratory settings. LabVIEW is as an extensive programming platform that includes a multitude of functionalities ranging from basic algebraic operators to advanced signal processing components that can be integrated into rather sophisticated and complex programs for use in the laboratory (and even industrial setting). For pedagogical reasons, we only introduce the main ideas from LabVIEW necessary for functioning in a typical undergraduate engineering laboratory environment. Specific topics discussed in this chapter are the associated learning objectives structure of PC-based data acquisition systems, development of simple virtual instruments using basic functionalities of LabVIEW, and addition of enhanced functionalities for interaction with external hardware. [4]Elmer Ccopa Rivera, Félix de Farias Junior, Daniel Ibraim Pires Atala, Rafael Ramos de Andrade, Aline Carvalho da Costa, Rubens Maciel Filho, A LabVIEW-based intelligent system for monitoring of bioprocesses, In: Jacek Jeżowski and Jan Thullie, Editor(s), Computer Aided Chemical Engineering, Elsevier, 2009, Volume 26, Pages 309-314, ISSN 1570-7946, ISBN 9780444534330, http://dx.doi.org/10.1016/S1570-7946(09)70052-5. (http://www.sciencedirect.com/science/article/pii/S1570794609700525) Keywords: Modeling; bioreactor; software sensor; artificial intelligence Abstract The application presented in this study illustrates the usefulness of an automated monitoring system carried out in LabVIEW environment. The results obtained have show that it is possible to infer into a real-time basis the key variables in bioethanol fermentation using pH, turbidity, CO2 flow rate and temperature on line measurements and a MLP-based Software Sensor. On-line monitoring system provided accurate online predictions of the concentrations during the
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fermentation process even when the secondary variables measurements were noisy. This study also will illustrate the usefulness of an automated monitoring system carried out in graphical programming environment. [5]Eftichios Koutroulis, Kostas Kalaitzakis, Development of an integrated data-acquisition system for renewable energy sources systems monitoring, Renewable Energy, Volume 28, Issue 1, January 2003, Pages 139-152, ISSN 0960-1481, http://dx.doi.org/10.1016/S0960-1481(01)00197-5. (http://www.sciencedirect.com/science/article/pii/S0960148101001975) Abstract Data-acquisition systems are widely used in renewable energy source (RES) applications in order to collect data regarding the installed system performance, for evaluation purposes. In this paper, the development of a computer-based system for RES systems monitoring is described. The proposed system consists of a set of sensors for measuring both meteorological (e.g. temperature, humidity etc.) and electrical parameters (photo voltaic voltage and current etc.). The collected data are first conditioned using precision electronic circuits and then interfaced to a PC using a data-acquisition card. The LABVIEW program is used to further process, display and store the collected data in the PC disk. The proposed architecture permits the rapid system development and has the advantage of flexibility in the case of changes, while it can be easily extended for controlling the RES system operation. [6]H.Q. Liao, Z.R. Qiu, G.H. Feng, The Design of LDF Data Acquisition System Based on LabVIEW, Procedia Environmental Sciences, Volume 10, Part B, 2011, Pages 1188-1192, ISSN 1878-
0296, http://dx.doi.org/10.1016/j.proenv.2011.09.190. (http://www.sciencedirect.com/science/article/pii/S1878029611003859) Keywords: LDF; Data Acquisition System; LabVIEW; Optic fiber-capacitance Liquid Sensor Abstract In the formation of liquid drops, different kinds of liquids may have different outer profiles; the change of volume and shape in the process of drop formation can indirectly reflect liquid's physical and chemical properties, such as surface tension and viscosity, etc. Real-time detection the size of drops in the forming process is on the basis of drop analysis technique. Previous researchers have studied that optic fiber and capacitance drop sensor fusion technology can indirectly gain drop's form and the volume. This article is based on the optic fiber and capacitance drop sensor theory, designing the system based on the LabVIEW software to realize the LDF (Liquid Drop Fingerprint) data acquisition function. The experiment results show that the system can well realize the acquisition, compared with the traditional VC programming technology, this data acquisition system is high efficiency. [7]B.R. Poorna chandra, K.P. Geevarghese, K.V. Gangadharan, Design and Implementation of Remote Mechatronics Laboratory for e-Learning Using LabVIEW and Smartphone and Cross-platform Communication Toolkit (SCCT), Procedia Technology, Volume 14, 2014, Pages 108-115, ISSN 2212-0173, http://dx.doi.org/10.1016/j.protcy.2014.08.015. (http://www.sciencedirect.com/science/article/pii/S2212017314000516)
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Keywords: Remote laboratory; e-learning; virtual lab; Mechatronics laboratory Abstract This paper reports a work-in progress at the SOLVE, Students Online Laboratory Through Virtual Instrumentation, at the National Institute of Technology, Surathkal, Karnataka on the design and implementation of a remote lab utilizing emerging technologies.The paper focuses on the basic implementation of a remote laboratory using the publisher-subscriber architecture. Control system and Vibration experiments were chosen for practical implementation which could be monitored and controlled by students using internet. This enabled the remote users to gain a better understanding of the concept of vibrations and control system by performing the real experiment at a time and place of their choice. Both publisher and subscriber were developed using LabVIEW and SCCT add-on for communication. SCCT provides high performance data communication on conventional platforms like LabVIEW, Android, HMTL5, Java, JavaScript, thereby making it multiplatform approach. The method followed for data acquisition by the experimental server, architecture followed at the publisher and subscriber end, brief description about the performable experiments is explained in the present paper. [8]Aissa Chouder, Santiago Silvestre, Bilal Taghezouit, Engin Karatepe, Monitoring, modelling and simulation of PV systems using LabVIEW, Solar Energy, Volume 91, May 2013, Pages 337-349, ISSN 0038-092X, http://dx.doi.org/10.1016/j.solener.2012.09.016. (http://www.sciencedirect.com/science/article/pii/S0038092X12003416) Keywords: PV systems; Monitoring; Modelling; Simulation Abstract This paper presents a detailed characterization of the performance and dynamic behaviour of photovoltaic systems by using LabVIEW real-time interface system. The developed software tool integrates several types of instruments into a single system which is able to offer online measurements all data sources and comparison simulation results with monitored data in real-time. Comprehensive monitoring and analyzing of PV systems play a very important role. The proposed method is a low-cost solution to provide fast, secure and reliable system by making the system database-ready for performance analysis of PV systems. The proposed method is also applied to a grid connected PV system in the Centre de Developpement des Energies Renouvelables (CDER) in Algeria. The results show that there is a good agreement between the measured and simulation results values. The integration methodology of robust simulation and monitored data in real-time can be extended to study the fault diagnosis of a PV system.