Eksperimentalni dinamski modeli podstruktur v metodah analize prenosnih poti

Ocepek, Domen (author), Čepon, Gregor (mentor), Boltežar, Miha (comentor)

V doktorski nalogi obravnavamo problematiko zajema konsistentnih eksperimentalnih dinamskih modelov za potrebe analize prenosnih poti, preko katerih se hrup in vibracije od vira vzbujanja prenašajo na pasivne dele struktur. V prvem delu naloge se osredotočimo na vpeljavo novih merilnih pristopov v metode analize prenosnih poti. Kot alternativo uveljavljenim metodah predlagamo hibridno metodo akustične holografije in laserske vibrometrije za določitev vibracijskega odziva strukture. Poleg možnosti brezdotičnega merjenja se na ta način ponuja tudi možnost kombiniranja različnih fizikalnih domen (akustični tlak in hitrost). Drugo področje naslavlja negotovost lokacije aplikacije sile z udarnim kladivom, kar predstavlja pomemben vir negotovosti admitance prenosnih poti. V delu je predlagan postopek karakterizacije negotovosti lokacije vzbujanja strukture, ki temelji na občutljivostni analizi. Tu ocenimo vpliv raztrosa lokacije posameznega impulza na celovitost sil, ki med obratovanjem delujejo v kontaktu med aktivno in pasivno podstrukturo. Tretje področje predstavlja izvirno metodo merjenja frekvenčnih prenosnih funkcij aktivno vzbujanih struktur med njihovim obratovanjem. Za primer, ko aktivno strukturo sklopa okarakteriziramo neodvisno od končnega sestava, v tem delu predstavljamo postopek za oceno prenosne funkcije sklopa zgolj na osnovi meritve njegovega odziva.

• Language: Slovenian
• Keywords: strukturna dinamika, dinamika podstruktur, analiza prenosnih poti, frekvenčna domena, frekvenčna prenosna funkcija, razširitvene metode
• Work type: Doctoral dissertation
• Typology: 2.08 - Doctoral Dissertation
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [D. Ocepek]
• Year: 2023
• Number of pages: 1 zv. (loč. pag.)
• PID: 20.500.12556/RUL-145133
• UDC: 519.6:531.2:53.08:534.64(043.3)
• COBISS.SI-ID: 149513987
• Publication date in RUL: 07.04.2023

OCEPEK, Domen, 2023, Eksperimentalni dinamski modeli podstruktur v metodah analize prenosnih poti [online]. Doctoral dissertation. Ljubljana : D. Ocepek. [Accessed 13 June 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=145133

Secondary language

• Language: English
• Title: Experimental dynamic models of substructures in transfer path analysis methods

Abstract

In the dissertation, we discuss the issue of incorporating consistent experimental dynamic models for the requirements of transfer path analysis, which investigates the transmissions of noise and vibrations from the excitation source to passive parts of structures. In the first part of the thesis, we focus on the introduction of new measurement approaches to transfer path analysis methods. As an alternative to established methods, a hybrid method of acoustic holography and laser vibrometry was proposed to determine the vibration response of the structure. In addition to the non-contact measurement, this method also offers the possibility to combine different physical domains (sound pressure and velocity). The second part of the thesis addresses the uncertainty of the impact location, which is a significant source of uncertainty in the transfer path admittance. In this work, a procedure for characterising the uncertainty of the location of structural excitation is proposed, based on sensitivity analysis. It is estimated how small variations in the location of an individual impact affect the completeness of the forces acting in contact between the active and passive substructures during operation. In the third part, an original method for measuring the frequency response functions of actively excited structures during their operation is presented. Since the active structure of the assembly is characterised independently of its final assembly, this part presents a method for evaluating the response function of the assembly based solely on measurements of its response.

• Keywords: structural dynamics, dynamic substructuring, transfer path analysis, frequency domain, frequency response function, expansion methods