The assessment of the technical condition of SO-3 engine turbine blades using an impulse test

Milewicz, Julia; Mokrzan, Daniel; Szymański, Grzegorz M.

doi:10.19206/ce-133872

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…This means that all violations, damages, or changes in the structure, even the minimal ones such as microcracking, change the vibration and acoustic signal parameters generated during standard operation or by deliberate excitation, e.g. during tests [15,18]. Therefore, it can be concluded that vibroacoustic diagnostics is a potentially effective method of determining the dynamic properties of elements made out of composite materials; especially in the aspect of assessing their technical condition and detecting structural damage.…”

Section: Wprowadzeniementioning

confidence: 99%

“…Oznacza to, że wszelkie naruszenia, uszkodzenia, zmiany w strukturze, nawet te minimalne o charakterze mikropęknięć powodują zmianę parametrów odpowiednio sygnału drganiowego i akustycznego generowanych zarówno podczas standardowej eksploatacji jak i poprzez celowe wzbudzanie np. podczas badań [15,18]. Można więc wywnioskować, że diagnostyka wibroakustyczna jest potencjalnie skuteczną metodą wyznaczenia własności dynamicznych elementów kompozytowych -szczególnie w aspekcie oceny ich stanu technicznego i detekcji uszkodzeń w strukturze.…”

Section: Wprowadzenieunclassified

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Using vibroacoustic methods to describe the dynamic properties of composite elements to assess their technical condition

Mokrzan¹,

Milewicz²,

Szymański³

2021

Pojazdy Szynowe

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W artykule zaprezentowano przebieg badań oraz analizę dotyczącą możliwości wykorzystania ciśnienia akustycznego jako parametru diagnostycznego w ocenie stanu technicznego elementów wykonanych z materiałów kompozytowych. Przeprowadzono eksperyment w postaci testu impulsowego z wykorzystaniem młotka modalnego jako wzbudnika odpowiedzi wibroakustycznej układu. Wykazano, że duże wewnętrzne ubytki w strukturze powodują zmiany charakterystyki funkcji odpowiedzi częstotliwościowej (Frequency Response Function, FRF) w paśmie poniżej 8 kHz. W wyniku przeprowadzonej analizy udowodniono, że ciśnienie akustyczne może być skutecznie wykorzystywane w diagnozie elementów wykonanych z materiałów kompozytowych.

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Section: Wprowadzeniementioning

confidence: 99%

Section: Wprowadzenieunclassified

Using vibroacoustic methods to describe the dynamic properties of composite elements to assess their technical condition

Mokrzan¹,

Milewicz²,

Szymański³

2021

Pojazdy Szynowe

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“…rotating machines (Bouaouiche et al, 2023; Chen et al, 2016; Jałowiecki et al, 2021; Shim et al, 2021), but also with the use of appropriate excitation also of elements which do not generate vibrations during normal operation, e.g. composite housing elements (Katunin et al, 2015;, beams or turbine blades (Milewicz et al, 2021). Most of the physical systems occurring in reality are characterized by non-linearity, which meet the assumptions of linearity only in the case of vibrations with low amplitudes.…”

Section: Introductionmentioning

confidence: 99%

The application of time-frequency methods of acoustic signal processing in the diagnostics of tram drive components

Mokrzan,

Nowakowski,

Szymański

2023

AoT

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The paper presents the course of investigations and the analysis of the possibility of applying selected methods of time-frequency processing of non-stationary acoustic signals in the assessment of the technical condition of tram drive components, as well as a new combined method proposed by the authors. An experiment was performed in the form of a pass-by test of the acoustic pressure generated by a Solaris Tramino S105p tram. A comparative analysis has been carried out for an efficient case and a case with damage to the traction gear of the third bogie in the form of broken gear teeth. The recorded signal was analyzed using short-time Fourier transform (STFT) and continuous wavelet transform (CWT). It was found that the gear failure causes an increase in the sound level generated by a given bogie for frequencies within the range of characteristic frequencies of the tested device. Due to the limitations associated with the fixed window resolution in STFT and the inability to directly translate scales to frequencies in CWT, it was found that these methods can be helpful in determining suspected damage, but are too imprecise and prone to errors when the parameters of both transforms are poorly chosen. A new CWT-Cepstrum method was proposed as a solution, using the wavelet transform as a pre-filter before cepstrum signal processing. With a sampling rate of 8192 Hz, a db6 mother wavelet, and a scale range of 1:200, the new method was found to infer the occurrence of damage in an interpretation-free manner. The results were validated on an independent pair of trams of the same model with identical damage and as a reference on a pair of undamaged trams demonstrating that the method can be successfully replicated for different vehicles.

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Determination of dynamic parameters of a tram wheel parts in a numerical and experimental modal analysis

Milewicz

Kołodziejczak

Nowakowski

et al. 2023

AoT

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The analysis of dynamic parameters finds effective application in processes related to the assessment of the technical condition of machines. Mass transport vehicles are particularly sensitive to maintaining an appropriate level of traffic safety through relevant design and diagnostics. The combination of numerical and experimental methods increases the efficiency of modal properties investigations, which can be used as diagnostic parameters. During the research, the authors performed a numerical model of a system composed of a rim and an inner disc of a wheel fitted in a Konstal 105Na tram, widely used in many polish cities and frequently subjected to repair and renovation processes. The Time Response analysis in SOLIDWORKS (also called Modal Time History) was then conducted, resulting in obtaining information about object vibration response in time domain to the impulsive excitation at given points. These signals were then processed in MATLAB aiming at determining the frequencies of natural vibration and damping ratios. The processing parameters in MATLAB were corresponding to the analysis settings of the experimental measurement, carried out within the BK Connect environment, with an impact modal hammer and piezoelectric transducers. When analyzing the experimental measurements, the authors applied Fast Fourier Transformation, Frequency Response Function and Complex Mode Indicator Function (the theoretical basis of which and practical sense of application were also presented in the paper). Finally, the results of the experiment were compared with simulation outcomes. This comparison allowed the obtainment of frequency characteristics of the vibration response to the impact and the deter-mination of the dynamic parameters of the actual object. Six frequencies of natural vibrations were determined in the frequency range of 0 to 3000 Hz, as well as their damping ratios and autocorrelation indicators between modes. Similarities and potential sources of differences between the numerical and the experimental results were identified and explained, followed by conclusions on the practical application of the presented research methodology in the industry.

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The assessment of the technical condition of SO-3 engine turbine blades using an impulse test

Cited by 3 publications

References 4 publications

Using vibroacoustic methods to describe the dynamic properties of composite elements to assess their technical condition

Using vibroacoustic methods to describe the dynamic properties of composite elements to assess their technical condition

The application of time-frequency methods of acoustic signal processing in the diagnostics of tram drive components

Determination of dynamic parameters of a tram wheel parts in a numerical and experimental modal analysis

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