Vietnam Journal of Mechanics
2815-5882
Cơ quản chủ quản: N/A
Lĩnh vực:
Các bài báo tiêu biểu
QUADRATIC AND CUBIC NON-LINEARITIES IN A QUASI-LINEAR PARAMETRICALLY-EXCITED SYSTEM
Tập 15 Số 3 - Trang 14-21 - 1993
A quasi-linear oscillating system always contains weak factors (negative and positive frictions, exciting forces in resonances, non-linarites of restoring forces) usually characterized by a small parameters €. Recently, some articles have distinguished the degree of smallness of different factors and interesting phenomena have been found [3, 4]. In the present paper, using the same manner, we sh......
Study on the velocity of droplet at steady state in contraction microchannels by numerical simulation
Tập 45 Số 4 - Trang 287-295 - 2023
The droplet-based microfluidic system is increasingly advancing and widely applied in various fields of analytical techniques and experiments. To optimize and advance this system, droplet dynamics is of utmost concern. The velocity of droplets is highly significant as it aids in precise droplet control and manipulation, ultimately leading to the optimization of device design and performance. This ......
#droplet dynamics #droplet-based microfluidic #contraction microchannel #numerical simulation #velocity of droplets
Mechanical response of outer frames in tuning fork gyroscope model with connecting diamond-shaped frame
Tập 41 Số 1 - Trang 79-87 - 2019
In tuning fork micro-gyroscopes, two outer frames are connected by using the linking elements. The driving vibrations of the two outer frames are required to be exactly opposite to generate the opposite sensing modes perpendicular to driving direction. These opposite driving vibrations are provided by a mechanical structure named the diamond-shaped frame. This paper presents mechanical responses o......
#tuning fork gyroscope #anti-phase mode #mechanical response
Tuning acoustic performance of multi-chamber hybrid mufflers
Tập 43 Số 3 - Trang 209-220 - 2021
In this paper, we investigate the functional acoustic performance of multi-chamber mufflers using a numerical approach. The wave propagation governing in expansion chamber domains is first introduced and solved by the finite element method. Our numerical results of selected muffler configurations are compared with the reference predictions model and experiments in order to validate the present pro......
#exhaust muffler #low frequency #sound transmission loss #partition #micro-perforated tube
Thermal postbuckling analysis of FG-CNTRC doubly curved panels with elastically restrained edges using Reddy's higher order shear deformation theory
Tập 42 Số 3 - Trang 307-320 - 2020
For the first time, postbuckling behavior of thick doubly curved panels made of carbon nanotube reinforced composite (CNTRC), under preexisting external pressure and subjected to uniform temperature rise is analyzed in this paper. Carbon nanotubes (CNTs) are reinforced into matrix through functionally graded (FG) distribution patterns, and effective properties of CNTRC are determined according to ......
#CNT-reinforced composite #thermal postbuckling response #higher order shear deformation theory #doubly curved panels #tangential edge constraints
Dynamic analysis of FG stepped truncated conical shells surrounded by Pasternak elastic foundations
Tập 42 Số 2 - Trang 133-152 - 2020
This research presents a continuous element model for solving vibration problems of FG stepped truncated conical shells having various material properties and surrounded by Pasternak foundations. Based on the First Order Shear Deformation Theory (FSDT) and the equations of the FGM conical shells, the dynamic stiffness matrix is obtained for each segment of the shell having constant thickness. The ......
#stepped shell #vibration of conical shell #functionally graded shell #continuous element method #Winkler–Pasternak foundation
Exact receptance function of a tapered AFG beam with nonlinearly varying ratios of beam properties carrying concentrated masses
Tập 45 Số 4 - Trang 296-317 - 2023
This paper presents a method for establishing the exact receptance function of a tapered axially functionally graded (AFG) beam with nonlinear ratios of properties using the Adomian method. In current papers, the Adomian method was applied for linearly tapered beams where the geometric series was used conveniently. However, for nonuniform AFG beams with nonlinearly varying ratios of properties, th......
#receptance #frequency response function #concentrated mass #functionally graded material beam
An error compensation controller for milling robots
Tập 45 Số 2 - Trang 105-116 - 2023
This paper presents a method of controlling a serial robot for milling by an inverse kinematic controller combined with an outer PD loop (Inverse Dynamics + PD controller), with calibration and compensation of errors in calculating the cutting forces. Because the cutting forces are generated at the time of cutting, at the contact area between the workpiece and the cutting tool, the generalized for......
#milling robot #robotic machining #robot dynamics #cutting force calibration #robot control
Whit ham method of the expansion near the wave front propagating on the river with bed load transport
Tập 12 Số 3 - Trang 8-14 - 1990
In this paper the non linear differential equation describing the behavior of water surface behind the wave front is obtained by Whit ham method. It is shown that the bed load transport could influence significantly on the stability of the flood wave. In the supercritical flow, the bed load wave will propagate upstream and will linearly stabilize. The different situations when the wave could toppl......