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EN
Internal combustion engine diagnostics using traditional methods of cylinder pressure signal processing limits the amount of information available about the combustion process. It is necessary to conduct research in order to obtain more precise information - in-creasing the combustion process diagnosis potential. One such suggestion is the use of an ionization signal and an attempt to link it to the flame development during combustion of gaseous fuels. The article attempts to identify such a relationship using a rapid compression machine due to optical access it provides to the combustion chamber. As a result of the research, the relationships between the ionization voltage (chemical and thermal) of the first combustion phase and the corresponding flame development rates were determined. A relatively high coefficient of determination value was obtained for both relations, which indicates the possibility of obtaining diagnostic information about the combustion process from the ionization signal.
2
Content available remote Lightning observation station at the Rzeszow University of Technology, Poland
EN
A short description of a lightning observation station which is arranged for investigation of natural lightning at the Rzeszow University of Technology, Poland is presented in the paper. The system is based on electric and magnetic field antennas and fast video camera.
PL
W artykule przedstawiono krótki opis stacji rejestracji wyładowań piorunowych, która aktualnie jest budowana na Politechnice Rzeszowskiej. Głównymi elementami systemu są anteny do pomiaru pola elektrycznego i magnetycznego oraz szybka kamera wideo.
PL
W artykule przedstawiono wyniki testów wykorzystania szybkiej kamery wideo do badań doświadczalnych interakcji w układzie człowiek-ręczne narzędzie wibroudarowe. Testy te stanowią wstęp do badań impedancji ww. układu. Testowano również wpływ częstotliwości wibracji narzędzia na sterowanie nim przez operatora.
EN
In the paper the results of experimental tests concerning interaction in human operator - percussive tool system with use of high speed video camera in were presented. The tests are introduction to investigations of mechanical impedance of system. The influence of the tool vibration frequency on operator's control was tested either.
4
Content available remote Effect of welding current on metal transfer in GMAW
EN
Purpose: The paper presents findings related to the influence of welding current on metal transfer in GMAW. The main goal was to understand how droplet diameter, droplet velocity and droplet transfer rate change with the wire feed speed which determines the welding current. Design/methodology/approach: The experimental station was designed and built. A high speed video camera "Olympus i-SPEED" was used. The investigations were conducted on an automated GMAW platform. For each wire feed speed the images of metal transfer and welding parameters were recorded. Findings: Research results presented in this paper indicate that the wire feed speed (welding current) has a significant influence on droplet diameter, droplet velocity and transfer rate. The new method based on narrow band filter for imaging is much more sensitive to the changes of welding conditions and should be used as a tool for monitoring of GMAW process. Research limitations/implications: The high speed video camera is an expensive instrument and it can be used only as a laboratory tool in monitoring and optimizing of welding processes. Practical implications: The gained experience will help to determine the further directions for the research on metal transfer in GMAW and help the authors to be prepared for studying the CMT welding process. This methodology will be particularly attractive for welded - structures manufacturing industry because it could significantly reduce the cost of production by optimizing welding parameters. Originality/value: The new method for monitoring metal transfer based on narrow band filter does not require He-Ne laser to be placed ob the opposite of the imaging plane to generate a shadow. This method is thus more compact and easier to use. The original results of these investigations are mathematic descriptions of droplet flight trajectory and droplet velocity.
5
Content available remote Szybkie kamery wideo jako narzędzie pomiarów dynamicznych
PL
W pracy omówiono aktualne tendencje rozwoju techniki szybkich kamer. Przedstawiono i przeanalizowano wyniki testów porównawczych pomiarów dynamicznych wykonanych za pomocą szybkiej kamery i innymi powszechnie stosowanymi technikami.
EN
In the paper the present trends of development of high speed cameras and their application in dynamic measurements were presented. Some tests of dynamic measurements made by high speed camera and classical methods were described, and their results compared and analysed.
PL
W pracy przedstawiono syntezę modeli matematycznych i strukturalnych ciała siedzącego człowieka poddanego wymuszeniom harmonicznym. Do syntezy modeli wykorzystano wyniki badań doświadczalnych wibracji układu fotel-siedzący człowiek za pomocą szybkiej kamery wideo i na ich podstawie dobrano odpowiadające im struktury fizyczne zawierające elementy aktywne.
EN
In the paper synthesis of mathematical and structural models of sitting human body was presented. The models, composed of passive and active elements, were synthesized on the basis of measurements of vibration of seat-sitting human body system subjected to harmonic excitation, registered by high speed camera system.
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