Kiriş Benzeri Sistemler için Kuvvet Tanı ve Sistem Tanımlama için Yeni Bir Yaklaşım: Mod Tarif

Year 2022, , 436 - 451, 31.05.2022

Tarık Tufan

https://doi.org/10.31202/ecjse.956081

Abstract

Yapı sağlığı izleme yöntemleri yapının işleyişi sırasında, yapı çevresel titreşimlere maruz iken, sistemi tanımayı dolayısıyla hasarı tespit etmeyi hedefler. Bu çalışmada, çevresel titreşimler için geçerli olabilecek mod tarif yöntemi aktarılmaktadır. Bu çalışmada önerilen ve farklı iki kuvvet etkime konumuna göre mod değişkenlerinin hesaplanmayı hedefleyen mod tarif yöntemi modal plan yöntemini kullanır. Modal planların bu çalışmada kullandığı yöntem serbest titreşimler için geçerli bir yöntemdir. Böylece, bu çalışma ile yazına yeni olarak, hem serbest titreşimler hem de çevresel titreşimler için geçerli olabilecek bir yöntem aktarılmıştır.
Genel olarak, çevresel titreşim analizlerinde yapıya etkiyen kuvvetler ölçülmez. Fakat bu çalışmada yazına yeni olarak kiriş benzeri sistemlerde modal planlar kullanılarak, kuvvetler ölçülmeden kuvvet konumunun tahmini çevresel titreşimler altında yapılabileceği gösterilmiştir. Sistem tanımlama adımındaki muhtemel hatanın en aza indirilebilmesi için kuvvet etkime konumunun çözümleme yapılan serbestlik derecesine yakın olmasının ve hedef frekans aralığına göre veri örnekleme sıklığının belirlenmesinin önemi vurgulanmıştır.

Keywords

Mod Plan, Kuvvet Konum Tahmini, Katlama Frekansı, Çevresel Titreşim, Serbest Titreşim

A New Approach to Force Estimation and System Identification in Beam-like Structures: Mode Description

Abstract

Structural health monitoring methods aim to identify the system and therefore the damage in the system during the operation of the structure, the building is exposed to environmental vibrations. In this study, the mode description method which is valid for environmental vibrations is proposed. The mode description which aims to estimate the modal parameters according to the two or more different input force locations uses modal plots. The method used by modal plans in this study is a valid method for free vibrations. Thus, in this study a method that can be applied for both free vibrations and environmental vibrations is proposed which is novel to the literature.
In general, the forces acting on the structure are not measured in ambient vibration analyzes. However, in this sudy, with the modal plot, estimation of the input force position under environmental vibrations without measuring the input forces is shown for the beam-like structures which is novel to the literature. For the system identification step to be performed with minimum error, the input force location must be close to the degree of freedom analyzed and the frequency of data sampling rate should be chosen according to the target frequency range.

Keywords

Modal Plot, Force Location Estimation, Nyquist Frequency, Ambient Vibration, Free Vibration

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