Dinamska karakterizacija teleskopskih tribun

Sprinčnik, Luka (author), Boltežar, Miha (mentor), Čepon, Gregor (co-mentor)

Delo obravnava dinamske lastnosti teleskopske tribune, katere prednost je optimalen izkoristek prostora, zaradi možnosti odpiranja in zapiranja sistema. Pri dinamskem odzivu teleskopskih tribun načrtovanje okarakterizirajo določeni standardi, večkrat pa so dinamske zahteve določene tudi s strani naročnikov. V delu je opisan postopek izgradnje poenostavljenega parametriziranega dinamskega modela tribune na osnovi metode končnih elementov. Prikazan je postopek popisa geometrije, definiranja kontaktov in materialnih lastnosti, mreženja ter določitev modalnih parametrov. Model omogoča generacijo teleskopske tribune s poljubnim številom vrst, s poljubnimi višinskimi in globinskimi koraki, s poljubno dolžino ter poljubnim številom med seboj povezanih blokov. Izvedena je harmonska in modalna analiza konstrukcije standardnih dimenzij. Identificirane so z vidika konstrukcije najbolj pomembne lastne frekvence in modalne oblike. S spremembo presekov kritičnih elementov konstrukcije izboljšamo dinamske lastnosti, saj dosežemo dvig prve lastne frekvence nad 6 Hz.

• Language: Slovenian
• Keywords: teleskopska tribuna dinamika metoda konˇcnih elementov modalna analiza harmonska analiza lastne frekvence
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-94853
• Publication date in RUL: 08.09.2017

Secondary language

• Language: English
• Title: Dynamic characterisation of telescopic bleachers

Abstract

The work studies dynamic characteristics of the telescopic bleacher, whose general attribute is optimal usage of space due to ability of opening and closing the system. Dynamic properties of the telescopic bleachers are characterized by standard regulation. In this work a development process of reduced parametric numeric model of telescopic bleacher with programme package Ansys APDL has been described. The procedure of geometry creation, contacts and material properties definition, meshing and solving has been presented. The model is able to generate geometry of the tribune with arbitrary number of rows, height step, depth, length and number of connected blocks. Harmonic and modal analysis of the construction with standard dimensions has been presented. The relevant natural frequencies and mode shapes have been shown. By changing cross section of critical elements of the bleacher, better dynamic characteristics has been reached, as the lowest natural frequency is greather than 6 Hz.

• Keywords: telescopic bleacher dynamics finite element method modal analysis harmonic analysis natural frequency