Blind adaptive extraction of impulsive signatures from sound and vibration signals
Ses ve titreşim sinyallerinden darbeli işaretlerin kör uyarlamalı çıkarılması
- Tez No: 945186
- Danışmanlar: PROF. DR. JOHAN E CARLSON
- Tez Türü: Doktora
- Konular: Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrol, Bilim ve Teknoloji, Elektrik ve Elektronik Mühendisliği, Computer Engineering and Computer Science and Control, Science and Technology, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2017
- Dil: İngilizce
- Üniversite: Luleå University of Technology
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Elektrik ve Bilgisayar Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Sinyalizasyon Mühendisliği Bilim Dalı
- Sayfa Sayısı: 180
Özet
The two questions in science ``why“ and ``how”are hereby answered in the context of statistical signal processing applied to vibration analysis and ultrasonic testing for fault detection and characterization in critical materials such as rolling bearings and thin layered media. Both materials are of interest in industrial processes. Therefore, assuring the best operating conditions on rolling bearings and product quality in thin layered materials is important. The methods defended in this thesis are for retrieval of the impulsive signals arising from such equipments and materials, representing either faults or responses to an excitation. As the measurements collected via sensors usually consist of signals masked by some unknown systems and noise, retrieving the information-rich portion is often challenging. By exploiting the statistical characteristics due to their natural structure, a linear system is designed to recover the signals of interest in different scenarios. Suppressing the undesired components while enhancing the impulsive events by iteratively adapting a filter is the primary approach here. Signal recovery is accomplished by optimizing objectives (skewness and $\ell_1$-norm) quantifying the presumed characteristics, rising the question of objective surface topology and probability of ill convergence. To attack these, mathematical proofs, experimental evidences and comprehensive discussions are presented in the contributions each aiming to answer a specific question. The aim in the theoretical study is to fill a gap in signal processing by providing analytical and numerical results especially on \emph{skewness} surface characteristics on a signal model (periodic impulses) build on harmonically related sinusoids. With understanding the inner workings and the conditions to suffice, the same approach is applied to different class of signals in ultrasonic testing, such as aperiodic finite energy signals (material impulse response) and a very short duration impulse as an excitation. A similar optimization approach aiming to enhance another attribute, \emph{sparseness}, is experimented numerically on the aforementioned signals as a case study. To summarize, two different objectives each quantifying a certain characteristic are optimized to recover signals carrying valuable information buried in noisy vibration and ultrasonic measurements. Considering the fact that a research is qualified as successful if it creates more questions than it answers and lets ideas flourish creating scientific value, the presented work aims to achieve this in statistical signal processing. Analytical derivations assisted with experiments form the basis for observations, discussions and further questions to be studied and directed on similar phenomena arising from different sources in nature.
Özet (Çeviri)
The two questions in science ``why“ and ``how”are hereby answered in the context of statistical signal processing applied to vibration analysis and ultrasonic testing for fault detection and characterization in critical materials such as rolling bearings and thin layered media. Both materials are of interest in industrial processes. Therefore, assuring the best operating conditions on rolling bearings and product quality in thin layered materials is important. The methods defended in this thesis are for retrieval of the impulsive signals arising from such equipments and materials, representing either faults or responses to an excitation. As the measurements collected via sensors usually consist of signals masked by some unknown systems and noise, retrieving the information-rich portion is often challenging. By exploiting the statistical characteristics due to their natural structure, a linear system is designed to recover the signals of interest in different scenarios. Suppressing the undesired components while enhancing the impulsive events by iteratively adapting a filter is the primary approach here. Signal recovery is accomplished by optimizing objectives (skewness and $\ell_1$-norm) quantifying the presumed characteristics, rising the question of objective surface topology and probability of ill convergence. To attack these, mathematical proofs, experimental evidences and comprehensive discussions are presented in the contributions each aiming to answer a specific question. The aim in the theoretical study is to fill a gap in signal processing by providing analytical and numerical results especially on \emph{skewness} surface characteristics on a signal model (periodic impulses) build on harmonically related sinusoids. With understanding the inner workings and the conditions to suffice, the same approach is applied to different class of signals in ultrasonic testing, such as aperiodic finite energy signals (material impulse response) and a very short duration impulse as an excitation. A similar optimization approach aiming to enhance another attribute, \emph{sparseness}, is experimented numerically on the aforementioned signals as a case study. To summarize, two different objectives each quantifying a certain characteristic are optimized to recover signals carrying valuable information buried in noisy vibration and ultrasonic measurements. Considering the fact that a research is qualified as successful if it creates more questions than it answers and lets ideas flourish creating scientific value, the presented work aims to achieve this in statistical signal processing. Analytical derivations assisted with experiments form the basis for observations, discussions and further questions to be studied and directed on similar phenomena arising from different sources in nature.
Benzer Tezler
- Blind adaptive extraction of impulsive signatures from sound and vibration signals
Başlık çevirisi yok
AZİZ KUBİLAY OVACIKLI
Doktora
İngilizce
2017
Elektrik ve Elektronik MühendisliğiLuleå University of TechnologyProf. JOHAN E. CARLSON
Dr. PATRIK PAAJARVI
- Derin öğrenme ile modülasyon sınıflandırması
Modulation classification with deep learning
SELÇUK BALSÜZEN
Yüksek Lisans
Türkçe
2021
Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrolİstanbul Teknik ÜniversitesiElektronik ve Haberleşme Mühendisliği Ana Bilim Dalı
PROF. DR. MESUT KARTAL
- Öz bilgi destekli derin öğrenme yaklaşımları ile hsg gürültü giderme
Self-ınformation empowered deep learning approaches for hsı denoising
ORHAN TORUN
Doktora
Türkçe
2024
Elektrik ve Elektronik MühendisliğiHacettepe ÜniversitesiElektrik-Elektronik Mühendisliği Ana Bilim Dalı
DOÇ. DR. SENİHA ESEN YÜKSEL ERDEM
PROF. DR. MEHMET ERKUT ERDEM
- Face recognition by using feature extraction structures
Özellık çıkarımı kullanarak yüz tanıma potansiyeli
AUMED MUHSIN ABBAS
Yüksek Lisans
İngilizce
2019
Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve KontrolBahçeşehir ÜniversitesiBilgisayar Mühendisliği Ana Bilim Dalı
DR. ÖĞR. ÜYESİ Tarkan AYDIN
- ارائه یک روش واترمارکینگ کور براساس کوانتیزه کردندرخت ویولت
A blind watermarking based on quantization ofwavelet trees
MESUT MELEK
Yüksek Lisans
Farsça
2010
Elektrik ve Elektronik MühendisliğiIslamic Azad UniversityElektrik ve Elektronik Mühendisliği Ana Bilim Dalı
YRD. DOÇ. DR. SİAMAK HAGHİPOUR