Temat: combustion engine diagnostic - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A method of engines’ diagnosis in operationA method of engines’ diagnosis in operationA method of engines’ diagnosis in operation
Autorzy:: Sitnik, L.J.
Sroka, Z. J.
Wróbel, R.
Powiązania:: https://bibliotekanauki.pl/articles/245541.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
combustion engine
engine diagnostic
diagnostic methods
engine technical conditions
Opis:: It was found that there are discrepancies between the values of diagnostic parameters obtained in the test and natural exploitation. In addition, no appropriate tests are carried out which would be based on the degree of engine degradation in long-term natural use. One of the reasons is the lack of adequate, non-invasive diagnostic methods. The aim of the work was to show the possibility of creating a new diagnostic parameter of combustion engines in their natural operation. The parameter can be determined by a new method (presented in the article). The method is based on the assumption that the technical condition of the engine can be judged on the basis of the run-up curve, and in particular, on the basis of the linear direction coefficient, which is approximated by the points of the run-up curve at particular moments of the run-up. An additional requirement is that the points of the run-up curve are the average value of the speed from many runs. In addition, the statistical distributions of the speed values in the individual moments of the run-up should be of the same type. The direction coefficient of the straight line determined is a diagnostic parameter. The value of the new coefficient is the value of the straight-line factor. Further works are underway to determine the relationship between the directional coefficient and the technical condition of the engine.
Źródło:: Journal of KONES; 2018, 25, 3; 403-410
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analyses of temperature and pressure condition in CI engines exhaust pipe in light of application NOx sensor to determine of catalytic converter efficiency
Autorzy:: Rychter, M.
Powiązania:: https://bibliotekanauki.pl/articles/243619.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
internal combustion engine
catalytic converter
diagnostic system
Opis:: The development of a catalytic converter required an analysis of selected physical parameters of the supports. This resulted from the necessity to assume given parameters of the supports applied in the tests in exhaust gas environment in the CI engines. An analysis of ionic conductors, which constitutes the basic solution in voltage sensors providing signals through NOx electrocatalysis, is presented. The aim of this paper is to determine the basis for the monitoring of catalytic converters in compression ignition engines by the emission level of a selected exhaust gas component as a diagnostic signal. The emission of NOx has been taken as the basis. This required the development of a specialized system allowing the reduction of NOx and obtaining of a diagnostic signal reflecting the level of the said reduction. This paper includes same results of testing and possibilities monitoring of prototype catalytic converter on the test bed. On the basis of the performed examinations and obtained test results the following conclusions can be drawn: the analysis of the NOx concentrations in exhaust gas from the compression-ignition engine can be based on the indications of the voltage probes with the modified electrodes of the oxygen pump, the application of the reduction conditions in the voltage probes using the nitrogen oxides reduction by the electro-catalytic way depends on the exhaust gas parameters, the values of which change depending on the rotational crankshaft speed and engine load, and for this reason obtaining the diagnostic signal for the whole engine operation range is impossible, the control of the correctness of the catalyst operation regarding the nitrogen oxides reduction can be realised for the defined operating parameters of the tested engine, for phases VIII and X of the ESC test the reheating the test probe installed before the catalyst was unnecessary, owing to the high exhaust gas temperature (737-759°C).
Źródło:: Journal of KONES; 2008, 15, 3; 451-463
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigation of the dynamic properties of engine fan titanium rotor blades in a high manoeuvrability aircraft in FOD aspect
Autorzy:: Szczepanik, R.
Powiązania:: https://bibliotekanauki.pl/articles/244435.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: aircraft
combustion engines
turbine engines
engine diagnostic
blades
Opis:: A current problem concerning the use of military and civilian aircraft is the damage caused to turbine compressor blades by ‘foreign objects’. Here the term ‘foreign objects’ means small stones, pieces of metal, cement pitch, asphalt, etc., left on runways and taxiways. Foreign objects also include ice and iced lumps of snow as well as birds sucked into aircraft engine air ducts. All such objects pose a serious threat to proper engine operation. They are very harmful in two respects. One is the direct danger during flight when a bird or some other object is sucked into the engine. The other danger is in what might occur in later flights if the engine, especially the compressor and turbine blades, are not inspected for durability reassessment. This paper presents an analysis of how the size and distribution of defects on blade edges affect, the frequencies and fatigue strength of titanium blades in the first four stages of a high manoeuvrability jet engine fan (low pressure compressor). In particular, damaged high manoeuvrability aircraft fan stage rotor blades and measured natural vibration frequencies and logarithmic decrement of damping of high manoeuvrability aircraft fan titanium blades are presented in the paper.
Źródło:: Journal of KONES; 2013, 20, 2; 371-376
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Probability measures of likelihood of diagnosis of the technical state of main combustion engines of sea-going ships
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/242346.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
diagnostic system
likelihood of diagnosis
theory of semi-Markov processes
Opis:: The paper presents reasons for the need of discerning the notions: likelihood of diagnosis and rightness of diagnosis while taking operating decisions. A probability formula for establishing the right diagnosis has been derived as a likelihood measure of diagnosis. For deriving the formuła, the theory of semi-Markov processes and Bayes' formula of the conditional probability have been applied. Other probability measures of likelihood of diagnosis have been also presented. These measures concern the technical state of such important systems as combustion engines of sea-going ships. However, they can be of use also for other ship systems. The paper provides description of a stochastic decision situation following from operation of combustion engines in any operating system and on this background there is presented some proposals of applying the technical diagnostics for controlling the engine operating process. Formulating a problem for the combustion engines, solving the problem, diagnostic inference and likelihood of diagnosis as well a simplified model of combustion engine operation taking into account diagnosis and control in time of operation are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 125-132
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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