magistrsko delo
Lučka Lenič (Author), Marjetka Krajnc (Mentor)

Abstract

Eksperimentalna modalna analiza se ukvarja z analizo vibracij dinamičnih struktur. Z merjenjem odzivov in vzbujanj sistema lahko vnaprej predvidimo obnašanje strukture in določimo kritične frekvence, ki lahko ogrozijo varnost ali delovanje nekega dinamičnega sistema, to je lahko npr. krilo letala, viseči most, teniški lopar itd. Pri eksperimentalni modalni analizi izvajamo postopek modalnega testiranja s pomočjo merilnih inštrumentov in tipal, ki jih uporabimo za merjenje vzbujanja in odziva sistema. Glavni rezultat modalnega testiranja je odzivna frekvenčna funkcija, ki je pravzaprav prenosna funkcija linearnega časovno neodvisnega sistema in vsebuje veliko informacij o lastnih nihanjih, prožnosti in dušenju strukture. V nalogi se obravnava postopek modalnega testiranja in ozadje metod nadaljne modalne analize za določanje lastnosti dinamičnih sistemov, katerih vedenje nas zanima pri različnih frekvencah. Modalno testiranje je izvedeno tudi na praktičnem primeru z uporabo merilne opreme in programja Dewesoft.

Keywords

modalna analiza;modalno testiranje;Fourierova transformacija;digitalna obdelava signalov;sistem linearnih navadnih diferencialnih enačb;frekvenčna odzivna funkcija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [L. Lenič]
UDC: 517.91
COBISS: 18483801 Link will open in a new window
Views: 1139
Downloads: 417
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Experimental modal analysis with system's response measurement
Secondary abstract: Experimental modal analysis deals with vibration of dynamic structures. Measuring system’s responses and excitations helps to predict structure’s dynamics and determine critical frequencies that can compromise safety or operation of a dynamic system, i.e. plane wing, suspension bridge, tennis racket, etc. With experimental modal analysis the process of modal testing is applied with the help of measurement devices and sensors that are used for acquiring system’s excitation and response data. Main outcome of the modal testing is a frequency response function which is actually a transfer function of a linear time invariant system and carries information of natural frequencies, stiffness and damping. This work presents the process of modal testing and basics of further modal analysis for determining dynamic properties of a system of interest in order to examine its behaviour at different frequencies. Dewesoft software and hardware is used for a practical example of a modal testing process.
Secondary keywords: modal analysis;modal testing;Fourier transform;digital signal processing;system of linear ordinary differential equations;frequency response function;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za matematiko, Matematika - 2. stopnja
Pages: IX, 79 str.
ID: 10983224