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1
Content available The Use of the Acoustic Signal to Diagnose Machines Operated Under Variable Load
Pawlik Paweł
Archives of Acoustics
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2020
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Vol. 45, No. 2
263--270
EN
Acoustic signal is more and more frequently used to diagnose machines operated in industrial conditions where installation of sensors is hindered. Impact of background noise seems to be the major problem as part of analysis of such signal. In most cases of industrial environments, background level is high; thus, it prevents against concluding as per standard methods that have been used in diagnostic testing. This study specifies the problem related to diagnosing machines operated under variable loads. Synchronous methods are used for diagnosing these types of machines, those include synchronisation of diagnostic signal with revolutions of the diagnosed machine. For the purpose of this study an acoustic signal was used as the diagnostic signal. Application of the synchronous method (order analysis) enables eliminating an impact of background noise derived from other sources. This study specifies application of acoustic signal to diagnose planetary gear in laboratory testing rig in order to discover damages at early stage of degradation. This method was compared with the method basing on measurement of vibrations.
2
Content available remote Zintegrowany system wspomagania decyzji do diagnostyki akustycznej w badaniu stanu technicznego silnika spalinowego
Deptuła A., Osiński P.
Mechanik
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2017
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R. 90, nr 7
574--576
PL
Przedstawiono przykład zastosowania systemu zintegrowanego jako narzędzia systemu wspomagania decyzji w diagnostyce akustycznej stanu technicznego silnika spalinowego. Obiektem badawczym był silnik spalinowy o zapłonie samoczynnym jednostki napędowej firmy Fiat, z systemem common rail. Materiały są wynikiem badań w obszarze projektowania i eksploatacji silników spalinowych, prowadzonych w Katedrze Inżynierii Pojazdów oraz Laboratorium Napędów Hydraulicznych i Wibroakustyki Maszyn przy Politechnice Wrocławskiej. Opracowano autorską metodę identyfikacji rodzaju uszkodzeń silnika z zastosowaniem grafów rozgrywających parametrycznie. Do testowania i identyfikacji własności akustycznych stworzono zintegrowany system decyzyjny, uwzględniający indukcyjny system uczenia maszynowego.
EN
Presented are possible applications of acoustic diagnostics in inspecting the technical condition of an internal combustion engine with autoignition on the example of the Fiat drive unit with common rail system. As a result of measuring the sound pressure level for specific faults and comparing the noise generated by the motor running smoothly, the detailed maps of changes in the acoustic spectrum are possible to generate. These results may be helpful in the future diagnostics of internal combustion engines. The results of scientific work in the area of research, design and operation of internal combustion engines, conducted at the Department of Automotive Engineering, in cooperation with the Laboratory of Hydraulic Drives & Vibroacoustics of Machines at the Wroclaw University of Technology are included. It has developed an authoritative method of identifying the type of engine damage using game-tree structures. An integrated decision system for induction machine learning was developed to test and identify acoustic properties.
3
Content available Utilisation of the Coherence Analysis in Acoustic Diagnostics of Internal Combustion Engines
Dąbrowski Z., Dziurdź J., Górnicka D.
Archives of Acoustics
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2017
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Vol. 42, No. 3
475--481
EN
The leading thought of the present text is that the internal combustion engine noise – regardless of all possible inconveniences – is a good information carrier that allows for the explicit diagnostics of such subtle defect as the valve face decrement which is so small that it is in practice ‘unnoticeable’ by the standard diagnostic-controlling system of a passenger car. However, such defect at its further propagation can be much more dangerous. Thus, diagnosing its initial state is worth trying. This study is a continuation of investigations where efforts were undertaken to perform the efficient diagnostics on the bases of observations and analyses of mechanical vibrations of the engine head.
4
Content available Decision Support System for Identifying Technical Condition of Combustion Engine
Deptuła A., Osiński P., Radziwanowska U.
Archives of Acoustics
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2016
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Vol. 41, No. 3
449--460
EN
The paper is a continuation of the publication under the title “Acoustic diagnostics applications in the study of technical condition of combustion engine” and concerns the detailed description of decision support system for identifying technical condition (type of failure) of specified combustion engine. The input data were measured sound pressure levels of specific faults in comparison to the noise generated by undamaged motor. In the article, the whole procedure of decision method based on game graphs is described, as well as the interface of the program for direct usage.
5
Content available Acoustic Diagnostics Applications in the Study of Technical Condition of Combustion Engine
Deptuła A., Kunderman D., Osiński P., Radziwanowska U., Włostowski R.
Archives of Acoustics
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2016
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Vol. 41, No. 2
345--350
EN
The paper presents the possible applications of using acoustic diagnostics in inspecting the technical condition of an internal combustion engine with autoignition on the example of the Fiat drive unit with common rail system. As a result of measuring the sound pressure level for specific faults and comparing the noise generated by the motor running smoothly, the detailed maps of changes in the acoustic spectrum are possible to generate. These results may be helpful in the future diagnostics of internal combustion engines. In the paper, the results of scientific work in the area of research, design and operation of internal combustion engines, conducted at the Department of Automotive Engineering, in cooperation with the Laboratory of Hydraulic Drives & Vibroacoustics of Machines at the Wroclaw University of Technology are included.
6
Content available Laboratory modelling and acoustic diagnostics of hydrodynamical processes
Chernov V.
Hydroacoustics
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2008
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Vol. 11
47-54
EN
In the present paper results of modelling of wind interaction with a water layer surface and research of the vortical structures arising downstream the flow around bodies are described. Results of the use of the method of acoustic diagnostics of spatially - periodic vortical flows are presented. At physical modelling in laboratory conditions wind was created with a low-velocity wind tunnel. The structure of an air stream and convective cells on water surface was investigated with the help of visualization. Some pictures of structures on the shallow sea surface are also demonstrated and discussed.
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