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    Wyświetlanie 1-11 z 11
    Tytuł:
    Identification of damages in the inlet air duct of a diesel engine based on exhaust gas temperature measurements
    Autorzy:
    Puzdrowska, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/133073.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel engine
    intake air channel
    diagnostics tests
    silnik Diesla
    kanał wlotowy powietrza
    badania diagnostyczne
    Opis:
    The temperature of the exhaust gas of a diesel piston engine, measured in the characteristic control sections of its thermo-flow system, can be a valuable source of diagnostic information about the technical condition of the elements limiting the working spaces thus separated, including the turbocharging system, but also its fuel supply system and replacement of the medium. In standard marine engine measurement systems equipped with an impulse turbocharging system, the exhaust gas temperature is measured at the outlet of individual cylinders and before and after the turbocharger turbine, using traditional thermocouples with high measurement inertia (time constant of tenths of a second and more). This means that for further diagnostic analyses, the average value of the periodically changing temperature of the exhaust stream leaving individual engine cylinders, the exhaust stream in the collective duct feeding the turbine and the exhaust stream in the exhaust duct of the turbine is used. This article proposes a new approach to the issue of diagnostic informationiveness of the exhaust gas temperature of a diesel engine, extending its observations with the dynamics of changes in the duration of one working cycle. The aim of the tests carried out on the laboratory stand of Farymann Diesel engine type D10 was to determine the diagnostic relations between the loss of permeability of the inlet air channel filter baffle and selected standards of the quick-changing signal of the exhaust gas temperature. On the basis of the calculations carried out, the following dynamic features of the recorded signal were determined: maximum amplitude of instantaneous exhaust gas temperature values (peak-to-peak value), its rate of increase and decrease, and the specific enthalpy of exhaust gases within one engine work cycle. Comparative analysis of numerical data characterizing the recorded quick-changing exhaust gas temperature courses clearly indicates obvious thermodynamic and energy consequences of partial loss of flow capacity of the air channel supplying the combustion chamber of the test engine. A further development of the experimental test programme is foreseen in order to determine a diagnostic matrix to support the diagnostic inference about the technical condition of the diesel engine on the basis of measurements and analysis of the quick-changing exhaust gas temperature.
    Źródło:
    Combustion Engines; 2019, 58, 2; 108-112
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method to achieve comparable thermal states of car brakes during braking on the road and on a high-speed roll-stand
    Metoda osiągania porównywalnych stanów cieplnych hamulców samochodowych podczas hamowania na drodze i na szybkoobrotowym stanowisku rolkowym
    Autorzy:
    Wolff, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/224245.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hamulce samochodowe
    skuteczność hamowania
    wymiana ciepła
    diagnostyka
    automative brakes
    heat transfer
    thermal state of brakes
    diagnostics tests
    Opis:
    The temperature of a brake friction surface influences significantly the braking effectiveness. The paper describes a heat transfer process in car brakes. Using a developed program of finite element method, the temperature distributions in brake rotors (disc and drum brake) of a light truck have been calculated. As a preliminary consistency criterion of the brake thermal state in road and roll-stand braking conditions, a balance of the energy cumulated in the brake rotor has been taken into account. As the most reliable consistency criterion an equality of average temperatures of the friction surface has been assumed. The presented method allows to achieve on a roll-stand the analogical thermal states of automotive brakes, which are observed during braking in road conditions. Basing on this method, it is possible to calculate the braking time and force for a high-speed roll-stand. In contrast to the previous papers of the author, new calculation results have been presented.
    Temperatura powierzchni ciernej hamulca w istotny sposób wpływa na skuteczność hamowania. Artykuł opisuje proces wymiany ciepła w hamulcach samochodowych. Stosując opracowany program metody elementów skończonych, wyznaczono rozkłady temperatur w wirnikach hamulców (tarczy i bębna) lekkiego samochodu dostawczego. Jako wstępne kryterium zgodności stanów cieplnych hamulca w warunkach hamowania na drodze i na stanowisku rolkowym założono bilans energii akumulowanej w wirniku hamulca. Jako bardziej wiarygodne kryterium zgodności przyjęto równość średnich temperatur powierzchni ciernej hamulca. Przedstawiona metoda umożliwia uzyskiwanie na stanowisku rolkowym analogicznych stanów cieplnych hamulców samochodowych, jakie występują w warunkach hamowania na drodze. W oparciu o tę metodę możliwe jest obliczenie czasu trwania i siły hamowania na szybkoobrotowym stanowisku rolkowym. W odróżnieniu od poprzednich artykułów autora, przedstawiono tu nowe wyniki obliczeń.
    Źródło:
    Archives of Transport; 2010, 22, 2; 259-273
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of data from on-board data recorders for acceptance tests of avionic driving units
    Autorzy:
    Kowalski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/243070.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diagnostics of aircraft engines
    qualification tests for avionic driving units
    Opis:
    The paper explains how information stored in on-board recorders of flight parameters can be used for acceptance tests, also referred to as qualification tests. The disclosed example refers to the An-28 ‘Bryza’ aircraft where an old airscrew was substituted with the new generation Hartzell airscrew of the HC-B5 MP-3D type. The airscrew is an integral part of the driving system for the airscrew propelled aircraft that is provided with the TWD-10B engine. After revamping of the airscrew, the aircraft was named as TWD-10B/PZL-10S. The follow-up investigations were carried out with the aim to find out how much the airscrew substitution affected the alteration of key performance characteristics achieved by the driving unit of the aircraft. The investigations comprised both ground and in-flight tests and have led to determination of the essential characteristics for the engine operation as well as variations of the operational parameters in time. In some cases also so called phase portraits were found out for parameters of the engine operation so that to reflect dynamic properties of the engines. Such investigations are indispensable since the aircrafts are subject to operational limitations and technical conditions that must be mandatory fulfilled due to requirements of flight safety. The paper demonstrates that the data stored in on-board recorders of flight parameters can be really useful for execution of such acceptance (qualification) tests.
    Źródło:
    Journal of KONES; 2013, 20, 2; 201-206
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of regulation condition assessment of turbine jet engine in flight basing on signals recorded during ground tests
    Autorzy:
    Golak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/246520.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    regulation
    computer simulation
    turbine jet engine
    parametric diagnostics
    ground tests
    Opis:
    During exploitation process operation quality differences may be observed between each particular machine and occurring in exploitation of one machine. These differences result from deviations of realized service process. Turbine jet engine regulation process was realized during ground tests. However, due to varying reactions of engines to external distortions, such as rocket launching, air swirl from another plane etc. as well as lack of possibility of simulation of in-flight conditions on ground (e.g. by partial choking of air intake), a situation may occur in which engine properly regulated on ground may not present sufficient efficiency in flight. Hence, the necessity to assess turbine jet engine regulation condition in flight basing on its ground tests. Research realized on computer models presenting engine operation both in flight and during ground tests indicated that real possibility of engine in flight regulation condition assessment based on its ground tests does exist. As was also noticed, with known input signal “w” and output signal “yW” recorded during engine ground tests as well as input “e” and output “u” signals from regulator during given test spectral powers and cross spectral powers of signals Swyw, Sww, See, Seu may be calculated and thus HW transfer function describing engine operation during ground test and GR transfer function describing regulator operation during given test and hence obtain transfer function HZ describing engine in flight. This grants possibility of regulation condition assessment of turbine jet engine in flight using signals recorded during ground tests.
    Źródło:
    Journal of KONES; 2012, 19, 3; 125-134
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of an aircraft engine start-up process on the example of the PZL-130 TC-II „Orlik” training aircraft
    Autorzy:
    Kowalski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/244355.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diagnostics of aircraft engines
    qualification tests of aircraft driving units
    Opis:
    The paper discloses the analysis of processes that take place during the start-up operation of the driving unit for the training aircraft of the TZL-130 TC-II Turbo-Orlik type. The aircraft is designed for selective and initial trainings at the Air Force School of “Little Eagles” in Dęblin. The driving unit comprises the PT6A-25C turbo-propeller engine from Pratt & Whitney combined with the four-bladed airscrew from Hatzell. It is specifically mentioned that data for the analysis were sourced from the S2-3a on-board recorder of flight parameters manufactured by the Air Force Institute of Technology (AFIT). The analysis was carried out both during ground and flight tests. The paper briefly outlines general structures and operation principles of typical start-up systems with the focus to their key components. Attention is paid to how important it is to select an appropriate start-up system to match the specific aircraft type and the guideline parameters for selection that should be adhered to are specified. Also there are disclosed the key mathematical relationships that are indispensable to design start-up systems and to find out their basic characteristics. It is emphasized that the start-up operation must be considered as a non-stationary process that lasts from the standstill state of the engine until the moment when the minimum required rpm is reached, sufficient to generate necessary power of the engine. In addition, the attention is paid to the fact that the value of the engine acceleration is crucial to the achievable start-up time that is deemed as one of key parameters for all start-up systems. It is demonstrated that to achieve the required level of acceleration, it is necessary to secure the so called overhead of the engine power which needs constant flow offuel and air into the combustion chamber of the engine. The last part of the paper comprises selected characteristic curves that were obtained from the analysis of the engine start-up processes both on ground and in flight. The final conclusions emphasize that the start-up system for the presented driving unit is really efficient and guarantees correct operation of the engine under any conditions.
    Źródło:
    Journal of KONES; 2014, 21, 3; 177-189
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-destructive and semi-destructive diagnostics of concrete structures in assessment of their durability
    Autorzy:
    Hoła, J.
    Bień, J.
    Sadowski, Ł.
    Schabowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/199847.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concrete
    durability
    diagnostics
    non-destructive tests
    semi-destructive tests
    trwałość betonu
    diagnostyka
    testy niedestrukcyjne
    testy pół-destrukcyjne
    Opis:
    This paper proposes a comprehensive classification of test methods for the diagnosis of concrete structures. The main focus is on the ranges of suitability of the particular methods and techniques for assessing the durability of structures, depending on the principal degradation mechanisms and their effects on this durability. The survey covers non-destructive testing (NDT) methods, which do not in any way breach the integrity of the tested structures, and semi-destructive testing (SDT) methods requiring material samples to be taken or any other minor breach of structural integrity. An original taxonomy of physical, chemical and biological diagnostic methods, useful in assessment of concrete structures durability, is proposed. Equipment specific for selected advanced testing methods is presented as well as exemplary test results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 87-96
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early detection of cracks in rear suspension beam with the use of time domain estimates of vibration during the fatigue testing
    Badanie wczesnego wykrywania pęknięć w belce zawieszenia tylnego z wykorzystaniem estymat przebiegu czasowego wibracji podczas próby zmęczeniowej
    Autorzy:
    Białkowski, P.
    Krężel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/328406.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    crack beam
    diagnostics
    vibroacoustics
    fatigue tests
    pęknięcie belki
    diagnostyka
    wibroakustyka
    testy zmęczeniowe
    Opis:
    In this article an early crack detection method during fatigue testing has been described. The test object was a beam mounted on a durability test bench. Piezoelectric accelerometers were mounted onto the beam. With observation of the signals from the accelerometers it was determined what change of the signal was caused by crack appearance during the test. Three car beams were tested. The measurement method and testing bench are described in this work. To determine the change of the signal and show potential cracks, time domain estimates have been used: RMS, peak, peak-peak, Crest Factor and Kurtosis. Results for all these estimates are listed in tables. Conclusions were drawn according to their variations in particular time ranges.
    W pracy opisano metodę wczesnego wykrywania pęknięć podczas prowadzenia testów zmęczeniowych. Badanym elementem była belka samochodowa zamontowana na stanowisku do testów wytrzymałościowych. Na belce zamontowano piezoelektryczne czujniki drgań. Na podstawie obserwacji sygnałów z czujników drgań określono jaką zmianę w sygnale powoduje pojawienie się pęknięcia w badanym teście wytrzymałościowym. Przebadano trzy belki samochodowe. Opisano sposób wykonania pomiarów oraz wykorzystane stanowisko badawcze. Do określenia zmian i pokazania potencjalnych pęknięć posłużono się estymatami wyznaczonymi z analizy czasowej: RMS, pik, pik-pik, Crest Factor oraz Kurtoza. Wyniki tych estymat, dla poszczególnych belek, przedstawiono w tabelach. Wnioski przedstawiono na podstawie zmian ich wartości w poszczególnych zakresach czasowych.
    Źródło:
    Diagnostyka; 2015, 16, 4; 55-62
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of diagnostic-therapeutic results after the first year of life in children of hearing disturbance risk groups
    Autorzy:
    Kocoń, Sebastian
    Wiatr, Agnieszka
    Hartwich, Patryk
    Stręk, Paweł
    Ziarno, Remigiusz
    Składzień, Jacek
    Wiatr, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1398129.pdf
    Data publikacji:
    2018
    Wydawca:
    Index Copernicus International
    Tematy:
    diagnostics of hearing impairement in children
    hearing screening tests
    risk factors of hearing impairmants in children
    Opis:
    Introduction: It is assumed that the critical period for diagnosis of hearing disorders is the baby’s first three months of life and that appropriate course and implementation of treatment and/or rehabilitation should begin before a child is six months old. However various kinds of problems may occur during auditory screening of a child may exceed this interval. Aim: The aim of this study was an evaluation of auditory screening results for children over 12 months old with congenital hearing loss. Material and methods: Results from 250 children were analyzed retrospectively. The study group consisted of children between one and three months old observed between 2015–2016. For the purpose of this analysis we divided the patients into four groups: • children with Down Syndrome • children with nervous system disorders • children with cleft palate or both cleft palate and lip • and children with congenital CMV. To discuss performed diagnostics and treatment two groups of children were esteblished: • with implementation of appropriate course of treatment • without instituted treatment. Results: 250 children were examined in Level III NICUs in the years 2015–2016. The highest proportion of children with the implemented course of proceedings, was in groups with children with congenital CMV (71,1%). The highest proportion of children substituted with a hearing prosthesis was observed in the group of children with Down Syndrome. The lowest proportion of children with the implemented course of proceedings, was in groups with children with cleft palate or both cleft palate and lip (41,6%). Conclusions: • Early implementation of treatment and/or rehabilitation in children with hearing disorders is crucial to prevent depression of speech and psychological development. I t is important in children with cleft palate or both cleft palate and lip even if surgical correction is discussed. • The highest proportion of children with the implemented course of proceedings, was in groups with children with congenital CMV. This children should be observed despite of right results of hearing tests. • In children with nervous system disorders 1 year period of observation is too short to exclude problems with hearing.
    Źródło:
    Polish Journal of Otolaryngology; 2018, 72, 3; 11-18
    0030-6657
    2300-8423
    Pojawia się w:
    Polish Journal of Otolaryngology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Driving style analysis based on information from the vehicles OBD system
    Autorzy:
    Lasocki, Jakub
    Chłopek, Zdzisław
    Godlewski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/132936.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    driving style
    driving patterns
    OBD
    On-Board Diagnostics
    road tests
    styl jazdy
    wzorzec jazdy
    samodiagnostyka pojazdu
    badania drogowe
    Opis:
    The purpose of this study was to analyse the possibility of using information from the On Board Diagnostics (OBD) system of the vehicle to determine the characteristics of the driver's driving style. Available data from the OBD system were considered and the most useful ones were selected for further investigation. Selected zero-dimensional characteristics of vehicle velocity as well as characteristics of relative position of the accelerator pedal were proposed as criteria for the assessment of driving style. The tests were carried out in conditions of real road traffic using a passenger car with a spark-ignition engine. The car was equipped with a device for recording signals from the OBD system. The tests included two drivers traveling on routes in the urban and rural areas. The obtained results were used to analyse the driving style of both drivers separately in the considered traffic conditions. On this basis, conclusions on the suitability of information from the OBD system for the assessment of the driver's driving style were formulated.
    Źródło:
    Combustion Engines; 2019, 58, 3; 173-181
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model tests of a marine diesel engine powered by a fuel-alcohol mixture
    Autorzy:
    Zacharewicz, Marcin
    Kniaziewicz, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2097626.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    model tests
    diesel engine
    model adequacy assessment
    alternative fuels
    diagnostics
    badania modelowe
    silnik Diesla
    ocena adekwatności modelu
    paliwa alternatywne
    diagnostyka
    Opis:
    The paper presents the results of model and empirical tests conducted for a marine diesel engine fueled by a blend of n-butanol and diesel oil. The research were aimed at assessing the usefulness of the proprietary diesel engine model in conducting research on marine engines powered by alternative fuels to fossil fuels. The authors defined the measures of adequacy. On their basis, they assessed the adequacy of the mathematical model used. The analysis of the results of the conducted research showed that the developed mathematical model is sufficiently adequate. Therefore, both the mathematical model and the computer program based on it will be used in further work on supplying marine engines with mixtures of diesel oil and biocomponents.
    Źródło:
    Combustion Engines; 2022, 61, 2; 83--88
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical analysis of the gas flame development in a RCM using a high-power ignition system
    Autorzy:
    Fiedkiewicz, Ł.
    Pielecha, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/133791.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    spark ignition
    plasma ignition
    optical tests
    combustion process diagnostics
    ignition systems
    zapłon iskrowy
    zapłon plazmowy
    testy optyczne
    diagnostyka procesu spalania
    układy zapłonowe
    Opis:
    The combustion process quality is determined by several factors: the composition of the fuel-air mixture in the vicinity of the spark plug and the discharge conditions on the spark plug. This article assesses a high-power ignition system using optical gas flame propagation analyzes. The tests were carried out in a rapid compression machine, using a fast camera for filming. The spark plug discharge quality assessment was determined indirectly by the flame propagation conditions after the ignition of the mixture (during methane combustion). The size of the flame surface and the rate of its change were assumed as a comparative criterion. It has been found that when using an ignition system with high discharge power the rate of flame development is 14% higher with respect to conventional ignition systems. In addition, the shorter development time of the early flame phase after discharge when using the new ignition system was confirmed. Based on the obtained test results and analyzes, modifications of engine operation settings were indicated, resulting from the use of a high discharge power system.
    Źródło:
    Combustion Engines; 2018, 57, 2; 47-54
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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