We apply two recently formulated mathematical techniques, Slow-Fast Decomposition (SFD) and Spectral Submanifold (SSM) reduction, to a von Kármán beam with geometric nonlinearities and viscoelastic damping. SFD identifies a global slow manifold in the full system which attracts solutions at rates faster than typical rates within the manifold. An SSM, the smoothest nonlinear continuation of a li...

In this study, a genetic algorithm (GA) is used to detect damage in curved beam model, stiffness as well mass matrices of the elements formulated using Hamilton's principle. Each node element possesses seven degrees freedom including warping degree freedom. The had been derived based on Kang and Yoo’s thin-walled theory. identification an optimization problem, binary continuous algorithms(BGA, ...

The modal frequencies, model shapes or their derivatives are generally used as the characteristic quantities of objective function for finite element (FEM) updating. However, measurement accuracy is low due to few numbers points actual structures, which results in a large correction error. antiresonant frequency reflects local information structure more accurately than mode shapes, good complem...

in this paper, the capabilities of displacement curvature derived from static response data for finding the location and severity of damage in euler-bernoulli beams are assessed. static response of a beam is obtained using the finite element modeling. in order to reduce the number of measured nodal displacements, the beam deflection is fitted through a polynomial function using a limited number...

This paper presents a recursive method of modal parameters identification based on operational measurements, dedicated for non-stationary systems. Decoupling signal components procedure allowed to reduce the signal model and simplified the process of modal parameters estimation. Adaptive method of filtering simplified the process of wavelet function selection. Presented method utilize Continuou...

the present paper sets out to investigate the syntactic category of persian modals, šâyad ‘perhaps’ and bâyad ‘must’. the syntactic category of the two modal elements has been viewed differently by different scholars. a number of scholars argue that both šâyad and bâyad are modal auxiliaries, while others claim that they both are modal adverbs. we propose that šâyad is a modal adverb and bâyad ...

The modal parameters of simple structures can be easily established by the use of PULSETM, the Multianalyzer System Type 3560. This application note describes how to measure the modal frequencies by inspection of frequency response functions, how to determine the modal damping with the aid of the frequency weighting function included in the analyzer, and how to establish the mode shapes by exam...

Many engineering structures are made of metal composite materials. External load information is a key issue for the design and condition monitoring structures. Due to limitation measurement technology external environment, it difficult directly measure dynamic loads on in many circumstances. This paper focuses evaluating applied structure with unknown properties. We proposed novel identificatio...

The numerical predictions of the hydroelasticity floating bodies with and without forward speed are presented using a direct time domain approximation. Boundary-Integral Equation Method (BIEM) three-dimensional transient free surface Green function Neumman-Kelvin approximation is used for solution hydrodynamic part solved as impulsive velocity potential whilst Euler-Bernoulli beam approach stru...

Civil infrastructures such as bridges and buildings are prone to damage as a result of natural disasters. To understand damages induced by these events, the structure needs to be monitored. The field of engineering focusing on the process of evaluating the location and the intensity of the damage to the structure is called Structural Health Monitoring (SHM). Early damage prognosis in structures...