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2 results on '"Structural vibration"'

1. STUDY ON STRUCTURAL-ACOUSTIC CHARACTERISTICS OF CYLINDRICAL SHELL BASED ON WAVENUMBER SPECTRUM ANALYSIS METHOD

Author

Liu Wenxi, Guan Huiren, Zhou Qidou, and Lou Jingjun

Subjects
cylindrical shell, wavenumber spectrum, structural vibration, thrust bearing supporting system, radiated noise, Naval architecture. Shipbuilding. Marine engineering, VM1-989
Abstract

By the finite element method, the structural vibration response is calculated under the action of the axial exciting force and the moment with different distribution form, and then the transfer function of the mean square normal velocity is analyzed. The wavenumber spectrum analysis method is used to separate and quantify the shell vibration in the wavenumber domain, and then the relation between the structural vibration characteristics and the structural wavelength is summarized. It is concluded that the structural vibration and radiated noise can be reduced under the symmetric action of axial exciting force and the moment. Based on the above conclusion, a symmetrical thrust bearing supporting system is designed and the stiffness of the supporting structure in the axial direction is controlled by selecting suitable size of structural members, therefore, the structural vibration and radiated noise of the submarine is reduced significantly.

Published
2021
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2. Dynamic properties of the pedestrian bridge at the Faculty of Civil Engineering Osijek

Author

Markotić, Mladen, Guljaš, Ivica, Jurić, Aleksandar, and Zovkić, Jurko

Subjects
structural vibration, modeling, human activity, SAP2000 v.18, pedestrian bridge, calibration, testing, results comparison, dynamic response
Abstract

U diplomskom radu analiziran je dinamički odziv pješačkog mosta na Građevinskom fakultetu Osijek uslijed različitih opterećenja pješaka. Za ukupnu ocjenu ponašanja pješačkog mosta provedena je eksperimentalna i numerička analiza pomoću računalnog programa. Dinamičko ispitivanje provedeno je u više faza ovisno o promatranom opterećenju. U prvoj fazi analizirana su ambijentalna ispitivanja, a u ostalim fazama, promatrano je ponašanje konstrukcije pješačkog mosta uslijed hodanja i skakanja pješaka. Dobivenim rezultatima dinamičkim ispitivanjem kalibriran je model pješačkog mosta koji najviše odgovara ponašanju realne konstrukcije. Model je izrađen u programskom paketu SAP 2000 v.18 te su modelirana opterećenja jednaka opterećenjima pri dinamičkom ispitivanju. Analizom i usporedbom rezultata eksperimentalne i numeričke metode opisan je dinamički odziv pješačkog mosta., In this work, the dynamic behavior of the pedestrian bridge at the Faculty of Civili Engeneering in Osijek was analized. Experimental and numerical analysis using a computer program were performed for the overall assessment of pedestrian bridge behavior. The dynamic test was performed in several phases depending on the applied load. In the first stage, the ambient vibration tests were analyzed, and in other phases, the behavior of the pedestrian bridge construction as a result of pedestrian walking and jumping was determined. The results obtained by dynamic testing were used for calibration of the model in order to produce the real constructive behavior. The model was created in the SAP 2000 v.18 program package and the modeled were similar to the loads used in dynamic testing. By analyzing and comparing the results of experimental and numerical methods, the dynamic response of the pedestrian bridge is determined.

Published
2017

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