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We present Geographic Information System model, which is developed on the basis of metasystem approach and it is focused on application as monitoring system of complex object. The model is described on the basis of set-theoretic approach, functions according to scenarios, integrates, processes and monitors the space-time and coordinate information. The problem of acquisition and reversible compression...
The use of virtual instruments has a very important role in both specialized laboratories and academic ones. Because it is a modern method, it provides increased comfort in monitoring electrical circuits in the long term, as well as reduced costs of implementing and developing laboratories. This paper deals with the efficiency of virtual instruments in monitoring electrical circuits as compared to...
This paper deals with two virtual instruments used for acting and controlling electrical circuits. Due to their working concept, these instruments have high flexibility for improvement, which makes them suitable for developing electro-technical virtual laboratories with affordable hardware and software resources.
This paper describes a virtual instrumentation architecture to measure and monitor partial discharges (PD) in high voltage equipment. The system has been successfully applied in the diagnosis of several rotating machines in Brazil. The proposed solution for PD measurement using virtual instrumentation involved defining architecture for the measurement system, the specification of suitable hardware...
In the world practice of designing highly reliable systems and ensuring the reliability of their operation in the process of operation is achieved through the use of specialized software complexes to determine the reliability of complex technical systems that perform the calculation of the aggregate reliability characteristics, and as a particular, simplest case, quantitative. For educational purposes,...
To improve the traditional electromagnetic induction methods for grounding grid diagnosis, a virtual instrument is proposed to detect weak signals in the harsh and noisy substation electromagnetic environment. The induced electric signal in the coil of wire, containing multi-source and intense noises, is collected by the NI DAQ device. Then virtual phase intensive detectors and digital filters constitute...
Main objective of this paper is to provide a practical tool for the analysis and study of power quality and deforming regime. The LabVIEW graphical programming environment is used for designing virtual instrument to achieve the main two objectives. First goal is synthesizing a distorted signal by adding a number of sinusoidal harmonics which composing it. An accurate voltage signal and the current...
In this paper is developed a flexible virtual instrument using LabVIEW for relative humidity measurement. The resulting virtual instrument eliminates the disadvantages of traditional measuring instruments whose functions cannot be changed by the user according to their needs, predefined by the manufacturer. Data acquisition interface (virtual instrument) was made in LabVIEW and give user the possibility...
This paper proposes a solution for crimped connection temperature measurement using data acquisition system NI PCI 6221, LabVIEW and thermocouple. The solution offers a modern alternative to traditional temperature measurement systems: a flexible virtual instrument with the advantages of changing the functionality by the users according to their needs. Virtual instrument was design in LabVIEW and...
This paper proposes a solution for relative humidity measurement using data acquisition system NI PCI 6221 and LabVIEW. This solution combines virtual instrument with physical instrumentation and offers a modern alternative to traditional humidity measurement systems: a flexible virtual instrument which eliminates the disadvantages of traditional measuring instruments whose functions cannot be changed...
Temperature and humidity play important role in many industrial fields. To examine the relationship between these two parameters, a PC program was developed with the help of LabVIEW to acquire both temperature and humidity variations in real time. To reduce the system cost, a simple data acquisition card was employed in the aspect of hardware design. The developed program has a user-friendly interface...
The importance and the physical meaning of the integral and differential factors of the voltage (and current) harmonics are highlighted. The core part of the LabVIEW virtual instrument for the evaluation of the voltage harmonics integral factors is presented. The simulating LabVIEW verification by means of the meander signal has been accomplished.
The latest virtual instrument and automatic test technology are adopted. One set of UAV avionics automatic test system for comprehensively testing radio altimeter, diastimeter anti-collision and alarm system, radio compass and multi-mode receiver is designed based on PXI module and GPIB instrument. Realization concept of key technologies, such as software and hardware design method, interface adaptation,...
The triboelectric phenomena resulting from impacts between the particles and the wall are known to affect the efficiency of suction-type dilute-phase transport systems. However this triboelectric charge could be used as an “image” of the granular product passing through the pipe. The aim of this paper is to investigate the feasibility of measuring the triboelectric charge acquired for using as an...
The study is mainly intended to solve the problem of Bisha University traditional Combinational Logic Circuits labs in design logic course. This course is one of the prescribed courses in computer science department-semester five. In A set of programmable virtual instruments in the Combinational Logic Circuits (VIs) have been designed and tested Using LabVIEW environment. The aim of this study is...
In aircraft ground physical simulation experiment, due to the continuous working battery voltage possibly drop, causing supply voltage of gyroscope sensor is not stable, affect the gyroscope performance. Kalman filtering technology is used to solve the problem of gyro output constant drift, polynomial fitting method is adopted to establish the gyro Angle compensation model to improve the test precision...
Electrocardiogram (ECG) is a biological signal which reflects the electronic excitement of cardiac activities and vital signs. As a kind of signal time marker, the parameter information of ECG, such as R wave amplitude and RR period, plays an important part in clinic. According to the traditional characteristics of ECG signal, an ECG automatic analysis system is designed based on virtual instruments...
In order to meet the requirement of development and field test, a missile launcher test system is designed based on virtual instrument and PCI bus. The composition, working principle, hardware and software structure of the system are introduced. Some key techniques, such as multithreading technology, signal processing and data storage under Labwindows/CVI environment are expatiated. It has been used...
Voltage dips are the most common voltage disturbance in electrical networks operation. A single phase dip is characterized by several amounts such as amplitude, phase shift, start point on wave and end point on wave. Given that electricity grids are three-phase grids and voltage dips can affect one, two or all three phases, researchers have proposed over time many methods of classifying them, which...
This paper presents the development of an active bridge based virtual humidity sensor system, where the capacitive humidity sensor and a reference capacitor forms two arms of the bridge. The bridge is excited by an AC voltage source of 1 kHz with amplitude of 200mV (rms). The amplitude of the input and output voltages and their phase difference are measured by National Instruments (NI) LabVIEW virtual...
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