Vrednotenje dinamskega odziva nelinearnega sistema s števnimi metodami

Hadalin, Anže (author), Boltežar, Miha (mentor), Česnik, Martin (comentor)

V zaključnem delu so obravnavani primeri uporabe števnih metod za oceno povzročene poškodbe iz signala odziva prototipa elektronskega aktuatorja na dinamske obremenitve. V delu predstavimo osnove analize signalov, ter obravnave naključnih procesov v časovni in frekvenčni domeni. Uporabljene so metode, ki so bile razvite za namen vrednotenja poškodbe zaradi dinamskega obremenjevanja struktur. Z uporabo računalnika so obravnavani signali realnih odzivov strukture ter generirani sintetični signali. Opisan je postopek izračuna poškodbe tako v časovni, kot tudi v frekvenčni domeni ter postopek generacije dveh sintetičnih signalov. Namen naloge je ugotoviti vplive karakterističnih lastnosti signalov na natančnost ocene intenzitete poškodbe s frekvenčnimi števnimi metodami, kjer je kot referenčna uporabljena metoda rainflow. Predstavljeni rezultati nakazujejo vplive gostote verjetnosti procesa odziva strukture ter frekvenčne vsebine signalov na natančnost ocene intenzitete poškodbe z uporabo frekvenčnih metod.

• Language: Slovenian
• Keywords: dinamsko vzbujanje, analiza signala odziva, rainflow števna metoda, frekvenčne števne metode, gostota močnostnega spektra, gostota verjetnosti
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [A. Hadalin]
• Year: 2020
• Number of pages: XIV, 64 f.
• PID: 20.500.12556/RUL-118693
• UDC: 519.8:681.586(043.2)
• COBISS.SI-ID: 27812611
• Publication date in RUL: 31.08.2020

HADALIN, Anže, 2020, Vrednotenje dinamskega odziva nelinearnega sistema s števnimi metodami [online]. Bachelor’s thesis. Ljubljana : A. Hadalin. [Accessed 17 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=118693

Secondary language

• Language: English
• Title: Evaluation of nonlinear system's dynamic response using counting methods

Abstract

The thesis discusses different examples of application of counting methods for fatigue damage estimation to the dynamic response signal of an electronic actuator prototype. The basics of signal analysis in time and frequency domain as well as random proces analysis are introduced. Methods used were developed for fatigue life estimation based on the time history of vibration loading. Real dynamic response signals and two synthetically generated signals were evaluated using specifically developed computer program. The algorithms used and the steps for generating synthetic signals are described in the study. Relations between signal characteristics and the accuracy of the damage intensity obtained by the counting methods is discussed, where the rainflow counting method is used as a reference. Results indicate that the effect of signal's probability density and frequency content on the accuracy of the frequency method estimation is not negligible.

• Keywords: dynamic excitation, response signal analysis, rainflow counting method, frequency counting methods, power spectral density, probability density