Vietnam Journal of Mechanics

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The theoretical model of interaction between the baroclinic boundary layers of atmosphere and ocean
Vietnam Journal of Mechanics - Tập 2 Số 1 - 1980
Presenting the theoretical model of the atmospheric and oceanic baroclinic boundary layers by interaction.Baroclinic effects of two boundary layers are described by the horizontal gradients of air temperature and water density in the equations of motion.The formulas computing the characteristics of the oceanic atmospheric baroclinic boundary layers were obtained.The above 1heoretical model is the ...... hiện toàn bộ
The influence of foundation mass on dynamic response of track-vehicle interaction
Vietnam Journal of Mechanics - Tập 41 Số 1 - 2019
Phuoc T. Nguyen, Trung D. Pham, Hoa P. Hoang
The influence of foundation mass on the dynamic response of track-vehicle interaction is studied in this paper. The moving vehicle is modeled as a two-axle mass-spring-damper four-degrees-of-freedom system. A new dynamic foundation model, called "Dynamic foundation model" including linear elastic spring, shear layer, viscous damping and foundation mass parameter, is used to analyze the dynamic res...... hiện toàn bộ
#Winkler foundation #two-parameter foundation #dynamic foundation model #foundation mass #track-vehicle interaction
Control of a pointer located on a vibrating system
Vietnam Journal of Mechanics - Tập 23 Số 1 - 2001
In this paper, the problem of controlling a bar supporting, at one end a pointer and hinged, at the other end, to a structural system vibrating under any extern excitation is investigated. The problem is to maintain the pointer toward the target with a prescribed tolerance. Emphasis is put on the uncertainty, which characterizes the problem and a simple fuzzy controller approach is discussed. Some...... hiện toàn bộ
#Active control #fuzzy control #linear electromagnetic motor #pointer
Dynamic analysis of prestressed Bernoulli beams resting on two-parameter foundation under moving harmonic load
Vietnam Journal of Mechanics - Tập 28 Số 3 - 2006
Nguyen Dinh Kien, Bui Thanh Hai
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
Two approximation methods of spatial derivatives on unstructured triangular meshes and their application in computing two dimensional flows
Vietnam Journal of Mechanics - Tập 28 Số 4 - 2006
Nguyen Duc Lang, Tran Gia Lich, Le Duc
Two approximation methods (the Green's theorem technique and the directional derivative technique) of spatial derivatives have been proposed for finite differences on unstructured triangular meshes. Both methods have the first order accuracy. A semi-implicit time matching methods beside the third order Adams-Bashforth method are used in integrating the water shallow equations written in both non-c...... hiện toàn bộ
Van der Pol systems with various restoring elements
Vietnam Journal of Mechanics - Tập 28 Số 2 - 2006
Tran Kim Chi, Nguyen Van Dinh
Van der Pol oscillators with various linear and cubic restoring elements are examined. The evolution of stationary self-excited oscillations is described and the role of self-excitation as that of restoring elements is shown. Numerical method on computer is used.
Linearization method in reliability problem
Vietnam Journal of Mechanics - Tập 15 Số 3 - 1993
A method for calculation of reliability of mechanical system by linearization of conditional functions of joint probability around its expectation is considered. A numerical example is given.
Some dynamical calculations of a transducer of two constact points type with two degrees of freedom
Vietnam Journal of Mechanics - Tập 4 Số 4 - 1982
As it is known, in machine-building two methods are used for checking the size of manufacturing details: the method of active check and the method of passive check and in connection with this there are two checking remedies: that of active check and passive check Is discussed in this paper the dynamical calculation of a transducer of type of two constact points with two degrees of freedom. The obt...... hiện toàn bộ
Partial derivative of matrix functions with respect to a vector variable
Vietnam Journal of Mechanics - Tập 30 Số 4 - 2008
Nguyen Van Khang
The partial derivatives of scalar functions and vector functions with respect to a vector variable are defined and used in dynamics of multibody systems. However the partial derivative of matrix functions with respect to a vector variable is also still limited. In this paper firstly the definitions of partial derivatives of scalar functions, vector functions and matrix functions with respect to a ...... hiện toàn bộ
The balancing of rotating machinery as non-linear system passing across a resonant region
Vietnam Journal of Mechanics - Tập 25 Số 4 - 2003
Tran Duong Tri, Nguyen Cao Menh
This paper presents a dynamical balancing method for the rotational part of machine as a nonlinear system with the decrease of rotation speed passing across a resonant region. After analyzing the nonlinear system and measurable vibration signals, a suitable procedure of dynamical balance for determining the magnitude and location of imbalance mass is proposed. A program on PC is made to illustrate...... hiện toàn bộ
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