Estimation of the frequency response functions for operational assemblies using independent source characterization

Ocepek, Domen (author), Vrtač, Tim (author), Čepon, Gregor (author), Boltežar, Miha (author)

In noise and vibration engineering, a structure’s passive dynamic properties are often evaluated in terms of its frequency response functions (FRFs). The typical FRF measurement campaign consists of controlled structure excitation and the capturing of its response. However, exploiting operational excitation for FRF acquisition is not feasible, with many sources simply too complex to model or measure directly. In the present paper, an alternative approach is proposed for an indirect FRF estimation of a system in operation, in which the source is characterized independently of the final assembly. To overcome the issue of the unmeasurable excitation force, transfer path analysis (TPA) methods are proposed. TPA replicates the source excitations using the set of equivalent or pseudo forces that are an inherent property of the source. The assembly’s FRFs are then evaluated on the basis of receiver responses and pre-determined pseudo forces for independent operational load cases at the source. Thus, a single source description can be applied to estimate the FRFs of any assembly with an identical source and arbitrary passive side.

• Language: English
• Keywords: frequency response function, source characterization, transfer path analysis, operational excitation, force transferability
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Publication date: 15.07.2022
• Year: 2023
• Number of pages: 14 str.
• Numbering: Vol. 182, art. 109542
• PID: 20.500.12556/RUL-138802
• UDC: 534.141
• ISSN on article: 0888-3270
• DOI: 10.1016/j.ymssp.2022.109542
• COBISS.SI-ID: 118438147
• Publication date in RUL: 18.08.2022

Record is a part of a journal

• Title: Mechanical systems and signal processing
• Shortened title: Mech. syst. signal process.
• Publisher: Elsevier
• ISSN: 0888-3270
• COBISS.SI-ID: 169243

Secondary language

• Language: Slovenian
• Keywords: frekvenčna prenosna funkcija, karakterizacija vira vzbujanja, analiza prenosnih poti, obratovalno vzbujanje, prenosljivost obratovalne sile

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0263
• Name: Mehanika v tehniki

• Funder: ARRS - Slovenian Research Agency
• Project number: N2-0144
• Name: Optična metoda za obratovalno identifikacijo reduciranega nelinearnega modela