Conference Program

Program of section Measurement

Lectures

 

Mario Dobrilović, Vječislav Bohanek, Vinko Škrlec, Siniša Stanković, Ivana Dobrilović:
VELOCITY OF DETONATION MEASURING DEVICE CALIBRATION METHOD
Presenter(s): Škrlec, Vinko

Abstract

The velocity of detonation is one of basic parameters for explosive power and quality determination that is measurable. Delay period has same meaning for detonators and other initiation devices. Determination of those parameters, delay period and velocity of detonation, is mostly performing by optical-electrical method of time period measurement. Electronic watch measuring time between two intensive light signal provide by detonation. Optical probes transfer signals to the time measuring device. Researchers, testing and producer laboratory accepted this method of measurement velocity of detonation and delay because is easy to use and gives with requested measurement accuracy. Difficulties are appeared with calibration of measurement device. For calibration of electronic watch method with digital oscilloscope was developed. That comparison method of calibration is described in paper.

 

URBANIAK A., SOZAŃSKI M.M.:
MONITORING OF FRESH WATER QUALITY FOR THE CHOICE OF TREATMENT TECHNOLOGY
Presenter(s): Not defined.

Abstract

Good quality of drinking water is a very important problem to be solved within a water supply system. The quality of drinking water delivered to consumers depends on fresh water quality, effectiveness of treatment processes and condition of distribution systems. The most important in this chain is a treatment process realized in a water treatment plant. The process strictly depends on pollutions existing in fresh water. Characteristics of underground water are usually stable thus the treatment processes can be established on the basis of laboratory analysis of fresh water. However, after longer exploitation of underground water sources the characteristics of fresh water may change. In case of surface water sources its quality depends more on the present climate change thus there is necessity to change the water treatment technology more often. The traditional approach of designing water treatment technology leads to the search of optimal process technology fulfilling all the requirements concerning drinking water. However, this approach is non effective in many cases because it is very difficult to change the realized water treatment technology respect to the change of freshwater characteristics. In the paper there are described the possibilities of complex analysis of fresh water obtained from surface sources, for monitoring and control reasons. The results of the analysis are necessary for preparing the proper technology for drinking water treatment. Full water analysis is a very complex measurement process that can be supported by specialized simulation tools. While constructing measuring process together with technological one it is possible to obtain the results in real time. The proposed simulation software allows to utilize the analysis results for change of technological water treatment processes by choosing the proper structure from the prepared technological scenarios.

 

Zoltán HEGEDŰS and István PINTÉR:
INVESTIGATING INDUSTRIAL PROCESSES WITH HIGH-SPEED COLOR CAMERA
Presenter(s): Hegedűs, Zoltán

Abstract

In this paper our recent results in investigating industrial processes with high-speed camera are presented. The subject of the analysis discussed in this paper was a car engine valve movement. The valve was wiggled by a mechanism actuated with an asynchronous ac-motor rotating at 5965 rpm in neutral gear. The image flow of the movement of the valve was recorded with the CUBE5 high-speed camera at speed of 5000 frame/s, with resolution of 512x512 pixels/24 bits of color/32000 frames. The excursion of the valve was measured with another image-processing software, namely by using the Framework 2.6.2 of DVT/Cognex’s intelligent camera’s distance soft-sensor. The basic aim of the work was the analysis of the valve opening distance in time. The paper shows the results in the distance-time graph, with several frames taken from the image-flow

 

Krzysztof Korbel 1, Henryk Zygmunt2:
IDENTIFICATION OF ELECTRIC DRIVE PARAMETERS EMPLOYING GENETIC ALGORITHMS
Presenter(s): Not defined.

Abstract

In order to ensure proper operation of an electric drive system it is necessary to have knowledge about its certain parameters. These parameters describe the system behavior under static or dynamic conditions. Their number depends on the system complexity as well on the requirements for accuracy and indirect complexity of the mathematical model. The subject of this work is a roller drive. Since the requirements for a roller drive rotational speed control are very stringent, exact identification of all necessary parameters is the key issue. Moreover, in transmission and coupling mechanisms backlash occurs with time due to mechanical abrasion. As backlash impacts the controller path it should be identified. This work proposes and describes an alternative method for identification of backlash effects the genetic algorithm, also known as the evolution algorithm. Starting with the definition of population, making selections, crossover, mutations, determination of next generation goodness and ending with “gold” population the identification process is completed. As the output it is an expected set of parameters, one of them is transmission backlash. The identification employs the algorithm developed by the authors using the author's program called “BioHunter”, which shows the start population, end population and visualization of the simulation.

 

P.Janecka, L. Smutny, J. Tuma:
Temperature measuring mobile object with use non-contac sensors
Presenter(s): Not defined.

Abstract

This contribution describes problems of non - contact temperature measuring. Non - contact temperature measuring be the fashion, fast way temperature measuring on seats, that the defy using common contact sensors. The purpose of this work is created laboratory model for non - contact temperature measuring for implemented to the education. The students should try out method of non - contact temperature measuring on this model and watch behavior temperature sensors depending on different ambient conditions. The main criteria for forming like this model is low price, simple control and flexible possibilities measuring. In this manner created model includes mobile object, machine table, location sensor, temperature sensors, term camera, usb field bus, usb converter and personal computer. The visualization and control is executed by the help of Control web software. Thorough this platform is possible to follow single measured valuables as well as move mobile object. All of the measured data are store to the database. Students making use this laboratory model, getting to know behavior single non - contact sensors temperature, can follow their static characteristics alternatively dynamic behavior all of system, depending on type of measured exercise. One of possibility is monitoring changes behavior sensors at constant temperature mobile object depending on distance from this sensor. We can follow response sensor on jump process temperature, or compare individual valuables non - contact sensor with thermocouples, measuring temperature inside mobile object.

Posters

 

Tamas B. Bako:
Reducing measurement bias in long-time DC-measurements

Abstract

This paper will not talk about a scientific novelty, but will be rather an engineer-to-engineer note, to show a problematic point of long time DC measurements and show tips how to achieve higher accuracy there. Several applications require the knowledge of DC level in an input signal. Usually the input signal is coming from a noisy environment and requires signal conditioning, typically filtering. In the case of DC measurement the simple average is popularly used because it is easy to calculate, latency time can be exactly determined and theoretically the output is unbiased. However, in the real world, at long time measurements rounding errors can seriously influence the output value. The problem is not just theoretical; our investigation is started because of a malfunctioning dilatation sensor system used at industrial turbines. The first part of the article will show the calculation of worst case error at average calculation in the case of floating point numbers (today this number type is popularly used in digital signal processing). We will show, if the number of summed elements is N, then the error at the output average will be proportional to N2. This result will also be proven by simulations. The simulations will show the effects of increasing N, the size of errors using different input values and the influence of additive noise on input to the error. The next part will explain and compare two methods to avoid accumulation of rounding errors. These methods are recursive averaging and multi-step averaging. Both methods are able to significantly reduce rounding errors, but they have different calculation demand and memory consumption. Simulations also will show performance of methods. As the result, we decided to use multi-step averaging at the dilatation sensor. With this technique the bias of measurements became smaller than the output noise level.

 

Roland KILIK, Amadou KANE and Abakumov V.G.:
The road to wireless IPTV

Abstract

The article is on wireless IPTV. It describes the current state that brings the authors close to the establishment of the world’s first published many-channel, high distance IPTV service, shows the road that lead to this, and describes the future tasks. The first part of the article describes the previous results and experiences of the authors in digital broadcasting that determine the IPTV side of a wireless IPTV solution, and briefly describes the wireless transmission facts that determine the wireless side. The next part firstly introduces the reader to the wireless measurements that lead to the choice of the optimal set and settings of the devices, and finally gives the results of the measurements of the currently working high-bandwidth multicast-based wireless IPTV test system.