Wyniki wyszukiwania - BazTech

1

Recognition of combustion process irregularities in small volume displacement diesel engines with the use of non-dimensional characteristics of the vibration signal

Merkisz J., Waligórski M.

Combustion Engines

|

2017

|

R. 56, nr 2

18--23

EN

The subject of the considerations described in the paper is the problem of early detection of abnormalities and damages during operation process of the turbo diesel engine with small volume displacement and direct fuel injection, which is used in modern LDV vehicles dedicated especially for urban areas, in the context of present and future requirements for a technical object diagnostics, taking into account the criteria of optimizing overall efficiency, toxic compound emission and safety of the object in real conditions of its operation. The paper presents the results of empirical research of vibroacoustic signal application to the diagnostic evaluation of correctness of short-time engine main processes. The evaluation of the combustion process variability from structural and operational abnormalities by using dimensionless estimates of a vibration process was conducted, and functional characteristics necessary to built the diagnostic algorithm in accordance with the requirements of on-board diagnostics were obtained.

2

Ocena wpływu ciśnienia paliwa zasilającego wtryskiwacz na parametry drgań tulei reakcyjnej wywołane rozpyloną strugą paliwa

Merkisz J., Markowski J., Waligórski M., Pielecha I.

Combustion Engines

|

2013

|

R. 52, nr 3

1129--1135

PL

Parametry ekologiczne silników o zapłonie samoczynnym w największym stopniu zależą do przebiegu procesu spalania. Właściwy przebieg tego procesu uwarunkowany jest odpowiednim przygotowaniem ładunku w komorze spalania, na które składa się zawirowanie czynnika oraz rozpylenie paliwa. Zawirowanie czynnika wynika z przyjętej konstrukcji układu dolotowego, parametrów geometrycznych komory spalania oraz prędkości obrotowej wału korbowego silnika. Rozpylenie paliwa zależy od parametrów wtrysku oraz stanu technicznego wtryskiwacza, a w szczególności jego rozpylacza. Autorzy obecnie pracują nad aplikacją koncepcji umożliwiającej ocenę zdatności wtryskiwacza na podstawie parametrów wibroakustycznych wywołanych wtryskiem paliwa. W artykule przedstawiono fragment dokonanych prac w zakresie weryfikacji wartości drgań tulei reakcyjnej wywołanych uderzającą strugą rozpylonego paliwa uzyskiwaną przy różnych wartościach nastaw ciśnienia w układzie zasilania. Działania te zmierzają do oszacowania zależności procesowych koniecznych do ujęcia w przyszłym algorytmie weryfikacji wtryskiwaczy.

EN

Diesel engine ecological parameters greatly depend on the course of the combustion process. An appropriate course of this process is conditional upon a proper mixture formation in the combustion chamber i.e. charge swirl and fuel atomization. The swirl of the charge results from the adopted design of the intake manifold, geometrical parameters of the combustion chamber and engine speed. The fuel atomization depends on the injection parameter and the conditions of the injector itself, particularly its nozzle. To date, the issue of a clear evaluation of the injector ability of obtaining appropriate atomization parameters remains unresolved. The paper presents the concept and the results of its validation based on the preliminary tests of fuel atomization in open space with the use of vibroacoustic processes. The authors are currently working on applying a concept enabling an evaluation of the injector applicability based on the vibroacoustic parameters resulting from the injection of fuel. The paper presents a fragment of the works related to the verification of the vibrations of the reaction sleeve triggered by the impinging atomized fuel spray at various fuel pressures in the fuel system. The actions aim at evaluating the process relations necessary for the future algorithm of fuel injector verification.

3

The assessment of the fuel atomization based on vibroacoustic processes

Merkisz J., Markowski J., Balerlein M., Waligórski M., Madry J.

Silniki Spalinowe

|

2011

|

R. 50, nr 3

EN

Diesel engine ecological parameters greatly depend on the course of the combustion process. An appropriate course of this process is conditional upon a proper mixture formation in the combustion chamber i.e. charge swirl and fuel atomization. The swirl of the charge results from the adopted design of the intake manifold, geometrical parameters of the combustion chamber and engine speed. The fuel atomization depends on the injection parameter and the conditions of the injector itself, particularly its nozzle. To date, the issue of a clear evaluation of the injector ability of obtaining appropriate atomization parameters remains unresolved. The paper presents the concept and the results of its validation based on the preliminary tests of fuel atomization in open space with the use of vibroacoustic processes.

4

Measuring head for operational testing of car suspension systems with vibroacoustic methods

Gardulski J.

Journal of KONES

|

2009

|

Vol. 16, No. 4

135-140

EN

The article provides a discussion upon the structure of a measuring head designed and manufactured with the purpose of acquisition of data required by a diagnostic system for hydraulic telescopic shock absorbers of passenger cars operating based on vibroacoustic methods. The basis for the design development was a set of initial assumptions adjusted to the multidimensional methods of analysing vibration signals applied. For the design of the measurement track, a block diagram was proposed which was then extended by auxiliary electronic elements of the measuring system conforming with all the relevant requirements. The main components of the measurement track included: a three-axis sensor for vibration acceleration constructed based on one-axis converters, an angular displacement sensor usedfor measuring the rotation angle and linear velocity of a car and a laser road unevenness sensor. For the computer recording of the signals being measured, an analogue-digital cardwas used. The measuring head in question was mounted on a measuring trolley and then test and trial examinations were conducted while driving at various speeds up to 50 km/h in normal operating conditions. The repeatability of the measurement results obtained proved the measuring head's usability in testing.

5

Testing methods for vehicle shock absorbers

Gardulski J.

Journal of KONES

|

2008

|

Vol. 15, No. 2

77-88

EN

The suspension is the component decisive about safety of drive of cars, in which dumping elements have essential meaning, which the most often are telescopic hydraulic shock-absorbers. Therefore, in exploitation process so important investigations of their technical condition are in track which opinion of their usefulness should be made not only to more far exploitation, but also the identification of typical damages. The common used method in practical ways of diagnosing of shock-absorber in article was introduced. There are two methods of investigations: built from and shock-absorber built-in in vehicle suspension. In first method - in support about indicatory graph, the characteristic of suppression be appointive. They are the basis to diagnostic opinion of technical condition of studied damper. In second method the results of investigations have approximate character. From those methods the most often used station control of vehicles in Poland - method post EUSAMA and BOGE in article were described, which used in investigations the harmonic excitatory of vibrations stimulant to vibrations unsprung and sprung masses of vehicle. The car is so folded, vibrate mechanical stimulated by excitator to vibrations arrangement. The vibro-acoustic methods of analyses' of signals in article were introduced, which can be practical in investigations of diagnostic shock-absorber. They are then the method of multidimensional analysis of signal - the Short-Time Fourier Transforms (the STFT), Wigner - Ville'a and Wavelet.

6

Comparison of analyses methods- continuous wavelet transform and winger-Ville'a transform in vehicle shock absorber diagnostic

Gardulski J.

Journal of KONES

|

2007

|

Vol. 14, No. 4

75-82

EN

The paper presents results experimental investigations, which the aim was settlement of usefulness of two methods of non-stationary signal analyses: continuous wavelet transform and Wigner-Ville'a transform. Usefulness of those methods in diagnostic of vehicle shock absorbers was compared. The new diagnostic estimator was used in investigations. Damping elements are essential sets decisive of the drive safety of cars. Damping elements are most often hydraulic telescopic dampers. Tunings mechanical stimulant devices for vibrations in which an element enforcing is plate on which runs with wheel of investigated damper are in generally practical in Poland in research of built-up dampers in passenger cars . Used methods of multidimensional analyses are fitted for the identification of the single damage in the diagnostics of built-up dampers in the vehicle. CWT distribution of relative vibration acceleration, diagram of Wmax estimator values for oil volumes changes, cumulative diagram of Wmax estimator values, WV distribution of relative vibration acceleration, diagram of Wmax estimator values for oil volumes changes, cumulative diagram of estimator Wmax values are presented in the paper.

PL

W artykule przedstawiono wyniki badań eksperymentalnych, których celem było ustalenie przydatności dwóch metod analizy sygnałów niestacjonarnych: metodę ciągłej transformaty falkowej i metodę transformaty Wignera-Ville'a. Porównano przydatność w/w metod do analizy uszkodzeń amortyzatorów teleskopowych samochodów osobowych. Do celów porównawczych wykorzystano nowy estymator diagnostyczny. Istotnych zespołem decydującym o bezpieczeństwie jazdy samochodów są elementy tłumiące, którymi są najczęściej hydrauliczne amortyzatory teleskopowe. W Polsce powszechnie w badaniach amortyzatorów zabudowanych w samochodach osobowych stosuje się przestrajalne mechaniczne wzbudniki drgań, w których elementem wymuszającym jest płyta, na którą najeżdża samochód kołem z badanym amortyzatorem. Zastosowane metody analiz wielowymiarowych nadają się do identyfikacji pojedynczego uszkodzenia w diagnostyce amortyzatorów zabudowanych w pojeździe. Rozkład współczynników transformaty falkowej względnych przyśpieszeń drgań, wykres wartości estymatora Wmax przy zmianie objętości płynu, wykres zbiorczy wartości estymatora WmaXi rozkład współczynników WV sygnału względnych przyśpieszeń drgań, wykres zbiorczy wartości estymatora Wmax przy zmianie objętości płynu, wykres zbiorczy wartości estymatora Wmax są prezentowane w artykule.

7

Application of vibroacoustic methods to validation of manufacturing process for grinding wheels.

Słowiński B.

Advances in Manufacturing Science and Technology

|

2006

|

Vol. 30, nr 1

71-77

EN

The effective managing of the processes is grounded on taking the decision based on facts - values of assumed criteria. The paper includes an analysis of the qualitative process capability coefficients cp, and cpk which can be used as criteria for validation of manufacturing processes. Possible applications of vibroacoustic methods to the validation of the manufacturing processes for ceramic grinding wheels were discussed. The results of investigations on the validation of such the processes for Polish, Italian, Czech and Austrian manufactures were presented.

PL

Skuteczne zarządzanie procesami polega na podejmowaniu decyzji opartych na faktach - wartościach przyjętych mierników. W pracy omówiono istotę wskaźników zdolności jakościowej procesu cp, i cpk, przyjętych za mierniki walidacji procesów wytwarzania. Omówiono także możliwość użycia metod wibroakustycznych do walidacji procesów wytwarzania ściernic ceramicznych, stosowanych do szlifowania wewnętrznych powierzchni walcowych pierścieni łożyskowych. Podano wyniki badań walidacji takich procesów dla producentów z Polski, Włoch, Austrii i Czech.