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Tytuł:
Portable multi-channel device for acoustic emission monitoring of structures and products
Autorzy:
Skalsky, V.
Serhiyenko, O.
Pochapsky, Y.
Plakhtiy, R.
Sulym, R.
Powiązania:
https://bibliotekanauki.pl/articles/329296.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnostyka techniczna
emisja akustyczna
badanie nieniszczące
destrukcja
acoustic emission
destruction
non-destructive testing
technical diagnostics
Opis:
In the paper eight channel acoustic emission (AE) device for selection, recording and processing signals of AE intended for use in the sphere of non-destructive testing of materials, products and structures of various forms and functional applications is described. The device is designed using a wide range of SMD elements and is adapted to work with Windows family operating systems. Specially developed software realizes functions of input data processing and its visualization, determination of defect position and storing the obtained results into computer memory. The above-listed characteristics as well as high rate of data exchange between the device and PC (12 Mbit/s), enables to work in real-time mode, and efficient software allow to compete with developments of such world leading manufacturers as PAC, Vallen Systeme, Interunis etc.
Źródło:
Diagnostyka; 2008, 3(47); 43-45
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of acoustic emission to monitoring the course of the alkali-silica reaction
Autorzy:
Świt, G.
Zapała-Sławeta, J.
Powiązania:
https://bibliotekanauki.pl/articles/200502.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alkali-silica reaction
acoustic emission
corrosion
microstructre
AE descriptors
Opis:
The study presented research on the possibility of using acoustic emission to detect and analyze the development of the alkali-silica reaction (ASR) in cement mortars. The experiment was conducted under laboratory conditions using mortars with reactive opal aggregate, accelerating the reaction by ensuring high humidity and temperature, in accordance with ASTM C227. The progress of corrosion processes was monitored continuously for 14 days. The tests were complemented with measurements of the expansion of the mortars and observations of microstructures under a scanning electron microscope. The high sensitivity of the acoustic emission method applied to material fracture caused by ASR enabled the detection of corrosion processes already on the first day of the test, much sooner than the first recorded changes in linear elongation of the specimens. Characteristic signal descriptors were analyzed to determine the progress of corrosion processes and indicate the source of the cracks. Analysis of recorded 13 AE parameters (counts total, counts to peak, duration, rise time, energy, signal strength, amplitude, RMS, ASL, relative energy, average frequency, initial frequency and reverberation frequency) indicates that the number of counts, signal strength and average frequency provide most information about the deleterious processes that occur in the reactive aggregate mortars. The values of RA (rise time/amplitude) and AF (average frequency) enabled the classification of detected signals as indicating tensile or shear cracks. The acoustic emission method was found suitable for monitoring the course of alkali-aggregate reaction effects.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 169-178
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety problem of cavity under open pit bench
Zagadnienie bezpieczeństwa zapadlisk pod warstwą wybierania w kopalni odkrywkowej
Autorzy:
Liu, X.
Li, X.
Gong, F.
Liu, K.
Powiązania:
https://bibliotekanauki.pl/articles/219373.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cavity
open pit
laser scanning
stability analysis
acoustic emission monitoring
pustki
kopalnie odkrywkowe
skanowanie laserowe
analiza stabilności
monitorowanie emisji akustycznej
Opis:
Some open pits in China are severely threatened by hidden cavities under benches which are always inaccessible and unmapped. The first thing to be well considered is safe and precise cavity detection, as the conventional detection methods cannot output a clear cavity vision, a three-dimensional laser measurement system is employed to perform detection, which is deployed from the surface through boreholes. The results from the scanner demonstrated very well the detailed level of information that can be collected In a cavity using this method, with the cavities’ layout under various benches being fully mapped. As detected cavities are always in horizontal and vaulted roof shape, two different theoretical calculation methods are proposed to analyze the cap rock stability for different roof shape. And also, the three-dimensional solid model generated through scanned laser data is used for stability numerical simulation by converting the data format into the one that recognized in corresponding software. Furthermore, acoustic emission technique is adopted to carry out long term real time rupture monitoring in cap rock, and four kinds of typical monitoring results are discussed which represent the rupture behavior in cap rock of unstable cavity, stable cavity, cavity with large working drill above and cavity beside explosion site. Thus, a complete safety evaluation system for such cavity will be established to ensure safe operation above.
W wielu kopalniach odkrywkowych na terenie Chin powstało zagrożenie wskutek istnienia ukrytych pustek pod warstwami wybierania (ławami), część z nich jest trudno dostępna, a niektóre nie są nawet naniesione na mapach. Najważniejszą kwestią jest więc bezpieczna i dokładna lokalizacja pustek. Ponieważ konwencjonalne metody wykrywania nie są w stanie ujawnić dokładnego obrazu pustek, zastosowano trójwymiarowy laserowy system detekcji pustek, zakładany z powierzchni poprzez wywiercone otwory. Odczyty ze skanera ujawniły dokładne zarysy pustek. Z pomocą tej metody można dokładnie obrazować układy pustek pod warstwami wybierania (ławami). Ponieważ stropy w wykrywanych pustkach są zawsze poziome lub sklepione, zaproponowano dwie teoretyczne metody obliczania stabilność stropu dla różnych jego kształtów. Ponadto, na podstawie danych ze skanera wygenerowano model bryły trójwymiarowej, który wykorzystany został do numerycznych badań stabilności stropu poprzez przekształcenie formatu danych na format rozpoznawalny w zastosowanym oprogramowaniu. Zastosowano także techniki pomiary emisji akustycznej w długofalowym monitorowaniu spękań stropu w czasie rzeczywistym, przeanalizowano cztery rodzaje uzyskanych wyników opisujących zachowanie stropu w przypadku pustek niestabilnych, stabilnych, pustek ponad którymi wykonano otwory znacznych rozmiarów oraz pustek w pobliżu miejsc prowadzenia prac strzałowych. Opracowano w ten sposób pełny system oceny stabilności pustek zapewniający bezpieczne prowadzenie prac ponad nimi.
Źródło:
Archives of Mining Sciences; 2015, 60, 2; 565-580
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibility of applying acoustic emission method for monitoring lathing process
Autorzy:
Dudzik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/245585.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Acoustic Emission
AE
diagnostic
finishing treatment
lathing
cutting parameters
Opis:
Nowadays acoustic emission (AE) method is used in many fields of science, including in the diagnosis and monitoring of machining processes such as turning, grinding, milling, etc. Monitoring of turning process allows ensuring stable conditions of treatment. Stable conditions of turning process have a great impact on the quality of the surface. This is especially important during finishing treatment. The research was carried out on a universal ZMM-SLIVEN CU500MRD lathe centre-using tool with removable insert SANDVIK Coromant WNMG 080408 – WMX Wiper. Lathing process was performed on the shaft of 74 mm in diameter made of S235 steel. The research was carried out at constant cutting speed v = 230 m/min. Changed parameters were feed f = 0.1; 0.2; 0.4 mm/rev and cutting depth ap = 0.5; 0.75; 1 mm. In the research was used a set of acoustic emission Vallen System. The kit includes: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz – 1 MHz and the strengthening of 34dB and AE signal measurement sensor type VS 150M, with a frequency range 100 – 450 kHz. During the study, the acoustic emission (AE) generated during the lathing process were recorded parameters e.g. amplitude, number of events – hits, the effective value of the signal (RMS). The test results indicate, that the higher instability of the process was during turning with parameters: ap = 0.75 mm and f = 0.1 mm/rev. The study can be the basis for the use of acoustic emission method for monitoring lathing process to ensure stable conditions of that process and the same to obtain a high quality surface.
Źródło:
Journal of KONES; 2019, 26, 2; 21-27
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On use of acoustic emission in monitoring of under and over abrasion during a water jet milling process
Autorzy:
Mikler, J.
Powiązania:
https://bibliotekanauki.pl/articles/100049.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
water jet abrasive milling
acoustic emission
signal analysis
water jet abrasive process control
Opis:
Water jet milling process is a new emerging technology with many interesting applications. Low cutting forces, no thermal distortion, process flexibility and ability to machine difficult to cut materials make it very attractive for many technological operations. However, its wider application is hindered by lack of proper solutions of process monitoring that would allow accurate control of the material removal process. The research contributions so far focused on use of acoustic emission, thus the purpose of this paper is an evaluation of the proposed strategies and analysis of applicability of acoustic emission for this purpose. An extensive amount of AE data was collected during waterjet machining with various feed rates, abrasive flows, and pump pressures, and analyzed with the aim to determine whether there exists any feature of the AE signal correlated with under- and over abrasion. Monitoring and control of removal rate is possible only if it is possible to discriminate between AE signal samples originating from different states of the abrasive process. In this paper I present results based on extensive one-way ANOVA study of the AE samples, showing, that the standard AE signal features proposed in the literature the energy and statistics of the AE signal do not allow such discrimination, and are not suitable to monitor abnormalities of the abrasive process. The research covers also principle component analysis of the AE signal energy performed in the aim to study if there exists any subset of the energy allowing better discrimination between the investigated process states.
Źródło:
Journal of Machine Engineering; 2014, 14, 2; 104-115
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibility of application of the acoustic emission method for monitoring friction processes
Autorzy:
Dudzik, K.
Ziegler, B.
Powiązania:
https://bibliotekanauki.pl/articles/245247.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Acoustic Emission
AE
diagnostic
friction regimes
Opis:
This article presents the methodology and research results of monitoring friction processes between couple of cooperating elements by acoustic emission method. The research was carried out at the lathing machine test stand of the Technische Hochschule Mittelhessen. The test stand included lathing machine Proxon PD 210, shaft, made of austenitic stainless steel X2CrNi18-9 and steel plate, made of S235. The Friction process was monitored by an acoustic emission set made by Physical Acoustics Corporation (PAC). The PAC system includes: preamplifier USB AE Node, type 1283 with bandpass 20 kHz – 1 MHz, AE signal measurement sensor type VS 150M, with a frequency range 100-450 kHz, computer with AE Win for USB Version E5.30 software. During the study, the acoustic emission (AE) generated by friction between shaft and steel plate was recorded. The load of the plate was 0, 1, 2, 3, 4, 5 and 10 N. The following parameters were determined: amplitude, number of events – hits, the effective value of the signal (RMS). The use of grease between the cooperating elements caused a significant reduction in friction and thus the power of the generated signal (10 to 30 times). In the case of dry friction, without grease, the maximum RMS value was recorded at 4 N load and at the lubricant between the pair cooperating at 1 N load. The research has shown that it is possible to monitor the friction process between cooperating elements using the acoustic emission method.
Źródło:
Journal of KONES; 2018, 25, 2; 113-119
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibility of using acoustic emission for monitoring technical condition of the fuel injector in 3AL25/30 engine
Autorzy:
Dudzik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27315939.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
emisja akustyczna
diagnostyka
monitoring
wtryskiwacz
układ paliwowy
acoustic emission
diagnostics
injector
fuel system
Opis:
Acoustic emission method (AE) can be used for the diagnosis of machine parts such as, for example: fuel injectors. This paper presents the methodology and research results of 3AL25/30 engine fuel injector. During research was studied one injector in good condition and second with simulated failure involving closing 2 of 9 holes of the injector tip. Research was carried out on a laboratory test stand using a set of acoustic emission Vallen System. This set included: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz-1 MHz and the strengthening of 34 dB, AE signal measurement sensor type VS 150M, with a frequency range 100-450 kHz. During the study, the acoustic emission (AE) generated by tested injector was recorded. The following parameters were determined: amplitude, rise time, duration time, total time, number of events - hits, the effective value of the signal (RMS). Analysis of the results showed significantly longer total time of the injection in the case of damaged injector compared to the injector in good conditions. Signal amplitude was higher, however, the RMS signal reached approximately 3-times lower value for the injector with damaged tip. This means lower quality fuel atomization. Laboratory test results were compared with signals recorded on injectors installed in the engine. Analysis of the signals allowed detection damage of the injector installed in the engine during normal operation.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 419-425
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibility of application the acoustic emission method for monitoring flow of water within a ball valve
Autorzy:
Dudzik, K.
Ziegler, B.
Powiązania:
https://bibliotekanauki.pl/articles/245518.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
acoustic emission
AE
diagnostic
ball valve
cavitation
Opis:
Acoustic emission method (AE) can be used for the diagnosis of machine parts or apparatus such as, for example, ball valves. This paper presents the methodology and research results of ball valve in fresh water systems. The opening angle of the valve was changed during the research. The flow of water was measured by a magnetically inductive flowmeter. The research was carried out on a laboratory test stand using an acoustic emission set made by Vallen Inc. This set included: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz – 1 MHz and the strengthening of 34 dB and AE signal measurement sensor type VS 150M, with a frequency range 100 – 450kHz. The obtained from the AE-System made by Vallen were compared with the results of the AE-System made by Physical Acoustics (PAC). The PAC system includes preamplifier USB AE Node, type 1283 with bandpass 20 kHz – 1 MHz, AE-Sensor R6D, computer with AE Win for USB Version E5.32 software. During the study, the acoustic emission (AE) generated by flowing water was recorded. The following parameters were determined: amplitude, number of events – hits, the effective value of the signal (RMS). Analysis of the results showed that within a specific range of opening angle of the valve the value of the generated acoustic emission in flowing water increases. This is probably associated with the occurrence of cavitation within the valve. This is an undesirable phenomenon and that these opening angles of ball valve should be avoided in the normal operation.
Źródło:
Journal of KONES; 2016, 23, 4; 87-92
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of underdeck corrosion by using acoustic emission method
Autorzy:
Emilianowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/260546.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underdeck corrosion
acoustic emission (AE)
corrosion tester
marine units
Opis:
This paper presents first short characteristics of underdeck corrosion process as well as a problem of its monitoring. Next is described an acoustic emission (AE) method elaborated by Department of Ship Technology, Quality Systems and Material Engineering, Gdańsk University of Technology in cooperation with partners of CORFAT project realized within 7th EU Frame Program. Further are presented short characteristics of the emission process, used measuring instrumentation of Vallen Systeme GmbH, as well as TESTER, corrosion testing device, and a corrosion solution used in the tests. Finally, results of the tests performed on selected marine units, are presented. 1*GUT - Gdańsk University of Technology 2*TÜV- Austria 3*TESTER - a device used for simulation of corrosion processes without destruction of tested material surface. 4*Corrosive solution - a solution which catalizes corrosion processes in the tester 5*SMW S.A.- Naval Shipyard Co.
Źródło:
Polish Maritime Research; 2014, 1; 54-61
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure mode analysis to define process monitoring systems
Autorzy:
McLeay, T.
Turner, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/100045.pdf
Data publikacji:
2011
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
fmea
process monitoring
Bayesian networks
PCA
sensor fusion
acoustic emission
Opis:
The high costs of using skilled operators in production processes has built a demand for reduced manning, 'lights out machining' manufacture. Process monitoring systems have become a widely researched area in recent years since there is a need for intelligent systems to replace the manual intervention in existing processes. Furthermore, using modern sensors and signal processing techniques, monitoring systems can obtain more informatio about a process and therefore reduce costs further though maximised life of cutting tools, optimised cutting parameters and reduced scrap or re-work. With many application areas available, such as tool condition monitoring, chatter avoidance or feedback control of cutting parameters, it is not always apparent what the key aspects required by an intelligent monitoring system are. In addition, different machining processes have different demands and limitations for monitoring. This paper considers an analytical approach to define the requirements of a monitoring system. A process failure mode effect analysis (FMEA) is carried out to determine the weaknesses of current production processes. From this analysis, the relationships between failures, causes and effects can be used to populate conditional relationships between process faults and sensor signal features in a monitoring system.
Źródło:
Journal of Machine Engineering; 2011, 11, 4; 118-129
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions in exhaust pipe in CI engine in light of monitoring of catalytycal converter
Autorzy:
Rychter, M.
Powiązania:
https://bibliotekanauki.pl/articles/242319.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
catalytic converter
emission
monitor
pressure
sensor
temperature
Opis:
The paper presents main method of monitoring catalytically comerter in CI engines. In this paper presents modified test bedwitch used to testes of exhaust pipe in light of determination possibility of application measurement probę to determine of NOx concentration. Those investigation could help to evaluate of possibility catalytically converter monitoring within the framework on board diagnostic systems The OBD system is an integral part of the vehicle connected with the engine control system, Nowadays the investigation on the on board diagnostic systems in their different applications are one of the basic problems that the OBD method is concerned with. The implementation of the investigation method for the OBD system efficiency is one of the main questions of the matter in hand. Diagram of modification exhaust pipe with installed catalytically converter in test bed and present of measurement points, distribution of temperature in measurement point TO-T8 exhaust pipe of testing engine without catalytically converter during realization ESC test, distribution of temperature in measurement point TO-T8 exhaust pipe of testing engine with 200 cpsi catalytically converter during realization ESC test, distribution of pressure in measurement point pO-p8 exhaust pipe oftesting engine without catalytically converter during realization ESC test, distribution of temperature in measurement point pO-p8 exhaust pipe of testing engine with 200 cpsi catalytically converter during realization ESC test are presented in the paper.
Źródło:
Journal of KONES; 2009, 16, 2; 401-406
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discrimination of Acoustic Emission Signals for Damage Assessment in a Reinforced Concrete Slab Subjected to Seismic Simulations
Autorzy:
Sagasta, F. A.
Torné, J. L.
Sánchez-Parejo, A.
Gallego, A.
Powiązania:
https://bibliotekanauki.pl/articles/177863.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
structural health monitoring
reinforced concrete structures
signal processing
Opis:
The purpose of this work is to distinguish between Acoustic Emission (AE) signals coming from mechanical friction and AE signals coming from concrete cracking, recorded during fourteen seismic simulations conducted with the shaking table of the University of Granada on a reinforced concrete slab supported on four steel columns. To this end, a particular criterion is established based on the Root Mean Square of the AE waveforms calculated in two different temporal windows. This criterion includes a parameter calculated by optimizing the correlation between the mechanical energy dissipated by the specimen (calculated by means of measurements with accelerometers and displacement transducers) and the energy obtained from the AE signals recorded by low-frequency piezoelectric sensors located on the specimen. The final goal of this project, initiated four years ago, is to provide a reliable evaluation of the level of damage of Reinforced Concrete specimens by means of AE signals to be used in future Structural Health Monitoring strategies involving RC structures.
Źródło:
Archives of Acoustics; 2013, 38, 3; 303-310
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic emission analysis of the plastic deformation stages of degraded low-carbon steel after long-term operation in the oil refining and petrochemical processing
Autorzy:
Lyasota, I.
Sarniak, Ł.
Kustra, P.
Powiązania:
https://bibliotekanauki.pl/articles/351029.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
monitoring
low carbon steel
plastic deformation
acoustic emission
refinery industry
Opis:
This paper presents results obtained from a laboratory investigation conducted on material from a pressure vessel after longterm operation in the oil refinery industry. The tested material contained structural defects which arose from improper heat treatment during steel plate manufacturing. Complex tensile tests with acoustic emission signal recording were conducted on both notched and unnotched specimens. The detailed analysis of different acoustic emission criteria allowed as to detect each stage of plastic deformation and microstructural damage processes after a long-term operation, and unused carbon steels during quasi-static axial tension testing. The acoustic emission activity, generated in the typical stages of material deformation, was correlated by microscopy observations during the tensile test. The results are to be used as the basis for new algorithms for the assessment of the structural condition of in-service pressure equipment.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 143-151
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of acoustic emission signal to the investigation of diesel engine fuel injection systems
Zastosowanie sygnałów emisji akustycznej do badania układów wtryskowych silników wysokoprężnych
Autorzy:
Bejger, A.
Powiązania:
https://bibliotekanauki.pl/articles/258346.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
emisja akustyczna
monitorowanie warunków
wtryskowa pompa paliwowa
wtryskiwacz
acoustic emission
condition monitoring
fuel injection pump
injector
Opis:
The experimental results of acoustic emission signals application to the investigation of the fuel injection system of a medium-speed marine diesel engine are presented. The introduced studies were confined to the phenomenon of the injection process. The features extracted from the raw acoustic emission signal were used to condition the monitoring of the main process of the injection system. The advantage of AE application in comparison to traditional methods is that the non-intrusive nature of the sensors can result in reduced set up times and cost.
W artykule zaprezentowano fragment prowadzonych przez autora badań układów wtryskowych silników okrętowych średnich mocy. Badano zjawiska zachodzące w układzie wtryskowym z wykorzystaniem sygnałów emisji akustycznej EA (znanej w lit. ang. jako acoustic emission lub stress wave emission). Za pomocą "czystego sygnału źródłowego" EA można w dokładny sposób określić procesy związane z pracą układu wtryskowego oraz układu wymiany czynnika roboczego (np. otwieranie/zamykanie zaworów dolotowego i wydechowego). Analizując sygnał pochodzący z układu wtryskowego (pulsacje I zmiany sygnału EA) wnioskować można o stanie układu iglica-prowadnica wtryskiwacza, początkach zacierania się iglicy, zmianie ciśnienia podiglicowego we wtryskiwaczu, a także o niewłaściwej pracy pompy wtryskowej. Istotną zaletą stosowanej przez autora metody jest to, że podłączenie czujnika do układu odbywa się bez jakiejkolwiek ingerencji w proces.
Źródło:
Problemy Eksploatacji; 2007, 3; 17-23
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of components of signals from high frequency range in condition monitoring of bearings
Wykorzystanie składowych sygnału z wysokiego pasma częstotliwości w diagnostyce łożysk
Autorzy:
Gałęzia, A.
Powiązania:
https://bibliotekanauki.pl/articles/327510.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
emisja akustyczna
parametry
ultradźwięki
momenty widmowe
diagnostyka techniczna
acoustic emission parameters
ultrasonic
spectral moments
condition monitoring
Opis:
The paper describes the utilization of high frequency range of vibro-acoustic signals in condition monitoring of bearings. High frequency components of signals, generated by a bearing working under operational conditions, contain low energy disturbances which might carry information related to the technical condition of the bearing. These high frequency signal components are most probably related to friction effects and the effects related to the behaviour of structure in mesoscale. The emergence of cracks leads to the changes in the friction of mating elements in bearings and has an influence on the structure in mesoscale. This in turn causes changes in high frequency range of the signal. Based on the monitoring of high frequency structure of signals, it is possible to draw conclusions about the changes in the technical condition of a bearing. The paper describes the application of measures, typical for acoustic emission, to acoustic signals recorded from bearings working on a laboratory stand. The measurements were performed with the uses of an ultrasonic microphone.
Publikacja przedstawia wykorzystanie wysokoczęstotliwościowych sygnałów wibroakustycznych w diagnostyce technicznej łożysk. Wysokoczęstotliwościowe składowe sygnałów, emitowanych przez pracujące łożysko, zawierają niskoenergetyczne zaburzenia, które mogą nieść informację związane ze stanem technicznym łożyska. Te wysokoczęstotliwościowe składowe sygnałów są najprawdopodobniej związane ze zjawiskami tarcia i zjawiskami zachowania struktury w mezoskali. Powstanie uszkodzenia prowadzi do zmian w tarciu współpracujących powierzchni łożyska i ma wpływ na zachowanie struktury w mezoskali. W wyniku tego następują zmiany w wysokoczęstotliwościowym paśmie sygnału. Wykorzystując monitoring wysokoczęstotliwościowej struktury sygnału, możliwe jest wnioskowanie o zmianach stanu technicznego łożyska. Publikacja przedstawia wykorzystanie miar, typowych dla emisji akustycznej, w analizie sygnałów akustycznych pracujących łożysk na stanowisku badawczym. Pomiary zostały przeprowadzone z wykorzystaniem mikrofonów ultradźwiękowych.
Źródło:
Diagnostyka; 2010, 3(55); 35-44
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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