Vietnam Journal of Mechanics
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Fault diagnosis of rolling bearings using singular spectrum analysis and artificial neural networks
Vietnam Journal of Mechanics - Tập 43 Số 2 - 2021
Singular spectrum analysis (SSA) has been employed effectively for analyzing in the time-frequency domain of time series. It can collaborate with data-driven models (DDMs) such as Artificial Neural Networks (ANN) to set up a powerful tool for mechanical fault diagnosis (MFD). However, to take advantage of SSA more effectively for MFD, quantifying the optimal component threshold in SSA should be ad...... hiện toàn bộ
#identifying bearing damage #AI for estimating damage #ANN-based damage identification #SSA for identifying damage
An analytical approach to analyze nonlinear dynamic response of eccentrically stiffened functionally graded circular cylindrical shells subjected to time dependent axial compression and external pressure. Part 2: Numerical results and discussion
Vietnam Journal of Mechanics - Tập 36 Số 4 - 2014
Based on the classical thin shell theory with the geometrical nonlinearity in von Karman-Donnell sense, the smeared stiffener technique, Galerkin method and an approximate three-term solution of deflection taking into account the nonlinear buckling shape is chosen, the governing nonlinear dynamic equations of eccentrically stiffened functionally graded circular cylindrical shells subjected to time...... hiện toàn bộ
#Functionally graded material #discontinuous reinforcement #buckling #elasticity #analytical modelling
Influence of edge crack on frequencies of thin plate in bending
Vietnam Journal of Mechanics - Tập 27 Số 2 - 2005
This paper investigates the influence of crack location and crack length on changes in natural frequencies of bending thin plate. To perform this analysis, a computing program called CRACK-PLATE, using the finite element method based on the Ressner-Mindlin' theory of plate is developed. In order to achieve a high accuracy, an isoparametric element of Barsoum is combined with an 8-node quadrilatera...... hiện toàn bộ
#bending cracked plate #frequency #finite element method #Ressner-Mindlin' theory of plate #element of Barsoum
Estimation of heat transfer parameters by using trained POD-RBF and Grey Wolf Optimizer
Vietnam Journal of Mechanics - Tập 42 Số 4 - 2020
The article presents a numerical model for estimation of heat transfer parameters, e.g. thermal conductivity and convective coefficient, in two-dimensional solid bodies under steady-state conduction. This inverse problem is stated as an optimization problem, in which input is reference temperature data and the output is the design variables, i.e. the thermal properties to be identified. The search...... hiện toàn bộ
#inverse analysis #Grey Wolf Optimizer #heat transfer parameters identification #Proper Orthogonal Decomposition (POD) #Radial Basis Function (RBF)
An approach to study vibration in stochastic systems based on the asymptotic method
Vietnam Journal of Mechanics - Tập 29 Số 3 - 2007
The well known Fokker-Plank-Kolmogorov Equation Method has been developed to study random vibration in systems with hysteresis that often described by the stochastic integro-differential equations or differential equations with delay.
Fatigue performance of tubular X-joints: Numerical investigation
Vietnam Journal of Mechanics - Tập 35 Số 1 - 2013
The cyclic actions due to waves, currents and winds on offshore platforms frequently cause fatigue cracks at hot-spot locations. The remaining fatigue life of such connections depends significantly on the fatigue driving force often measured by the stress-intensity factors. This study examines the fatigue performance of tubular joints fabricated using a new type of enhanced partial joint penetrati...... hiện toàn bộ
#Fatigue #tubular X-joints #crack propagation #SIF #finite element model
Dynamic analysis of prestressed Bernoulli beams resting on two-parameter foundation under moving harmonic load
Vietnam Journal of Mechanics - Tập 28 Số 3 - 2006
This paper describes the dynamic analysis of prestressed Bernoulli beams resting on a two-parameter elastic foundation under a moving harmonic load by the finite element method. Using the cubic Hermitian polynomials as interpolation functions for the deflection, the stiffness of the Bernoulli beam element augmented by that of the foundation support and prestress is formulated. The nodal load vecto...... hiện toàn bộ
Influence of trajectories on the joint torques of kinematically redundant manipulators
Vietnam Journal of Mechanics - Tập 29 Số 2 - 2007
This paper presents an algorithm for solving the inverse dynamics problem of redundant manipulators using MAPLE software. The method has the advantage of generating efficient symbolic solutions which reduces the computational cost. The influence of trajectories on the joint torques of redundant manipulators is considered. The theory is illustrated by the numerical simulation of a redundant four-li...... hiện toàn bộ
#Redundant manipulator #inverse dynamics #kinematic redundancy
Crack identification in beam by antiresonant frequencies
Vietnam Journal of Mechanics - Tập 43 Số 4 - 2021
The present paper deals with the concept of antiresonance in multiple cracked beams and application for multi-crack identification. First, governing equations for antiresonant frequency are conducted and used for both computing antiresonant frequencies versus crack parameters and measuring-loading colocation and identifying cracks by measured antiresonant frequencies. Then, a procedure is proposed...... hiện toàn bộ
#cracked beam #antiresonant frequency #crack identification
Exact receptance function and receptance curvature of a clamped-clamped continuous cracked beam
Vietnam Journal of Mechanics - Tập 41 Số 4 - 2019
The receptance function has been studied and applied widely since it interrelates the harmonic excitation and the response of a structure in the frequency domain. This paper presents the derivation of the exact receptance function of continuous cracked beams and its application for crack detection. The receptance curvature is defined as the second derivative of the receptance. The influence of the...... hiện toàn bộ
#receptance #curvature of receptance #frequency response function #crack #crack detection
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