IMEKO Event Proceedings Search

   

Page 771 of 977 Results 7701 - 7710 of 9762

Tassanai Sanponpute, Apichaya Meesaplak
VIBRATION EFFECT ON ROCKWELL SCALE C HARDNESS MEASUREMENT

Three ranges of Rockwell scale C reference hardness blocks: 20, 40, and 60 HRC were measured by deadweight-lever system hardness testing machine with two types of display: analog and digital. The testing machines were placed on the vibration table, whose frequency and amplitude of vibration can be controlled. Piezoelectric probe and vibration meter were used to confirm both amplitude and frequency of vibration. The hardness value at free from vibration is used as a reference to calculate the error of each hardness measurement at certain frequency and amplitude. Both machines give the same tendency. At vibration frequency higher than 15 Hz, there is no significant error of measurement in any vibration amplitude lower than 0.04 m/s² for all three hardness ranges. However, below 15 Hz vibration frequency, the negative error of both digital and analog displayed machine appears significantly higher and increases as the amplitude of vibration increases. Moreover, the softer range of hardness is more affected by the vibration. . Therefore, the result from this paper can be used as guideline for laboratory to control environmental vibration amplitude to be less than 0.01 m/s² for frequency (10 ± 5) Hz and 0.05 m/s² for other in Rockwell scale C hardness measurement.

Grzegorz L. Pankanin, Artur Kulinczak
DETERMINATION OF VORTEX CONVECTION VELOCITY WITH APPLICATION OF FLOW VISUALIZATION AND IMAGE PROCESSING

The paper is related to von Karman vortex shedding phenomenon being the basis of the vortex flow meter design. The vortex convection velocity belongs to the problems rather rarely touched on in papers and articles. But its recognition can improve our knowledge concerned the applied phenomenon and finally help in its better understanding. Due to the flow visualization supported by the image processing, tracking of the vortices is feasible. Finally, the convection velocity can be calculated and its changeability along the pipe axis can be evaluated.

Edi Kulderknup, Jürgen Riim, Tuuli Levandi
UNCERTAINTY OF ROAD TRAFFIC SAFETY MEASUREMENTS

Road traffic has important part for the every days life. Traffic accidents are related to the vehicles technical side and to the traffic surveillance from authorities and police. Environment is damaged mainly through vehicles exhaust gases, noise and vibration. This study work deals with road traffic safety measurements uncertainties. Damages can be minimised if uncertainties of the measurements are estimated and taken into account by above areas. In this work will be given models of uncertainty estimation for the vehicles technical conditions measurements, environment safety measurements and authorities surveillance measurements. Estimated and validated are concrete values of the uncertainties for various situations using measurement comparison data.

Valter C. Rosa, Amauri Oliveira, Ligia S. Palma, Luiz Fernando G. T. Amaral
AN INHERENTLY LINEAR TRANSDUCER USING THERMAL SIGMA-DELTA MODULATOR

The aim of this article is to describe a feedback circuit with thermoresistive sensor based on thermal sigma-delta modulator. The circuit uses 1-bit first order sigma-delta modulator in which a considerable part of conversion functions is performed by the sensor. This transducer circuit is able to measure digital physical quantities that interact with the sensor: temperature, thermal radiation and fluid velocity. In this study, it is used to measure environment temperature, on which digital output is linearly dependent. Equations that support circuit behaviour, simulation results and experimental results are shown. Two architectures are presented, one completely analogue and other with some parts digitally implemented using microcontroller. In addition, it is presented a thermal radiation architecture version in which digital output is intrinsically linear to the thermal radiation measure.

Janusz Zelezik, Stanislaw Walus
THE CONSTRUCTION OF THE MEASURING INSTRUMENTS AS THE SUBJECT OF MASTER'S THESES FROM METROLOGY OF NON-ELECTRICAL QUANTITIES

The students of automation and robotics, electronic and telecommunication are preparing their master's theses in Measurement Systems Group of Institute of Automatic Control. They also include the projecting and constructing of measuring instruments and measuring systems. These are dedicated to the laboratories in the Institute, as well for industry. The pocket radiometer was projected and constructed. It consists of the primary device with Geiger-Müller counter, the secondary device and of the power supply. The radiometer has series connections RS232C. The calibration stand for rotameters based on the soap film flowmeter principle was projected and constructed and put on the market. The digital measuring interface was projected and constructed for investigating of the piezoresistors (for strange gages, pressure gages, ...). The universal interface for transducers UTI and the microcomputer AT89C52 are used. The sensors can be used in the bridge or half-bridge, and for the resistance of 120 - 10000 ohms. The results of measurements are displayed on LCD display. The instrument is connected with help of the RS 232C interface with computer.

Madiar Zaripov, Irina Petrova, Victoria Zaripova
PROJECT OF CREATION OF KNOWLEDGE BASE ON PHYSICAL AND TECHNOLOGICAL EFFECTS

In the new millennium the change of technological and technique generations occurs in a temp unprecedented earlier. Therefore in order to train high-qualified engineers able to quickly, efficiently react to society’s new needs it is necessary for them to upgrade their knowledge permanently.
Indicators consumption increase both in quantity and in nomenclature needs an acceleration of production rate owing to automation of design process. The problem is that a description of various physical processes on which the principle of indicators action is based, is being carried out with the use of physic-mathematical apparatus, appropriate to this class of phenomena. It hampers the design process automation, increases new indicators development time and their cost. The article considers a united system approach in the field of sensitive elements theory, invariant to the physical nature of phenomena and processes used and in the field of methods and instrumental means of these elements structural designing with following process automation.

Roman Wyzgolik, Dariusz Buchczik
INTEGRATED SOLID STATE SENSORS IN ENGINEERS EDUCATION – EXPERIENCES AND PLANS FOR FUTURE

The measurements of non-electric quantities with electric methods have a long-standing tradition at the Silesian University of Technology. In this paper we would like to present the main idea and topics of the lectures and briefly describe the laboratory exercises. We also discuss the plans for the future.

Stanislaw Walus, Janusz Zelezik
THE MASTER'S THESES ON THE ESTIMATION OF METROLOGICAL PROPERTIES OF MEASURING INSTRUMENTS ON THE BASE OF THE EXPERIMENTAL INVESTIGATIONS AND THE MATHEMATICAL MODELLING

The students of the Department of Automatic Control, Electronics and Computer Science are preparing their master's theses in Measurement Systems Group of Institute of Automatic Control. They include the experimental investigations in Institute laboratory of various measuring instruments and also the mathematical modelling of primary devices of flowmeters and other instruments. Some results of master's theses were published in Polish scientific newspapers and in international conference proceedings. The measurement system for identification dynamic model of thermometers by "in-situ" method was elaborated. The measurement system enables identification of dynamic models of resistance thermometers by three methods: classical step-input method and two in-situ (internal input) methods. The mathematical modelling of distorted velocity distributions enables the investigation of errors of sampling flowmeters. On the base of the experimental data from rivers the modelling investigations for sampling flowmeter used for open channel were made.

Shigeru Takayama, Komyo Kariya
LEARNING METHOD OF MEASUREMENT ENGINEERING THROUGH USER NAVIGATION INTERFACE OF VIRTUAL INSTRUMENT

This paper describes the extensional function of user navigation interface of virtual measuring instruments which supports user’s self-learning in experiment. The extensional function is presented by representation of knowledge database through internet browser. It is very effective for user to learn and investigation the knowledge of measurement engineering with training of operation of real or virtual measuring instruments in experience. The knowledge exploration by hyperlink through HTTP presents new heuristic learning method for user comparing with systematical learning method by lecture.

Ludwik Referowski, Ryszard Roskosz, Dariusz Swisulski
NEW POSSIBILITIES IN THE EDUCATIONAL PROCESS OF ELECTRICAL MEASUREMENTS

In the paper are presented the possibilities of preparations modern, educational tools which in the form of virtual instruments are very helpful for educational process in electrical measurements. These dynamic instruments enable to perform during the lectures demonstrations which explain better lectured theory of electrical measurements, especially when some kinds of phenomena are presented in slow down time scale. Another group of virtual instruments enable to simulate measuring sessions which are realized later in the university laboratory. The third group of virtual instruments explain the idea of remote measurements with help of modern technologies. These measurements are realized on different industrial objects. The paper presents several solutions of educational virtual instruments designed by the team of Technical University of Gdansk. They were realized using the software LabVIEW of National Instruments.

Page 771 of 977 Results 7701 - 7710 of 9762