scholarly journals Numerical simulations of biological flows and their engineering applications

2021 ◽  
Vol 235 (2) ◽  
pp. 205-207
Author(s):  
Fang-Bao Tian
Keyword(s):  
Numerical Simulations ◽  
Engineering Applications ◽  
Biological Flows

Pneumatic pulsator design as an example of numerical simulations in engineering applications

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Krzysztof Wołosz ◽  
Jacek Wernik
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Cast Iron ◽  
Numerical Simulations ◽  
Stress Analysis ◽  
Aluminium Alloy ◽  
Loose Material ◽  
Engineering Applications ◽  
Pressure Losses ◽  
Pneumatic Impact

AbstractThe paper presents the part of the investigation that has been carried out in order to develop the pneumatic pulsator which is to be employed as an unblocking device at lose material silo outlets. The part of numerical simulation is reported. The fluid dynamics issues have been outlined which are present during supersonic airflow thought the head of the pulsator. These issues describe the pneumatic impact phenomenon onto the loose material bed present in the silo to which walls the pulsator is assembled. The investigation presented in the paper are industrial applicable and the result is the working prototype of the industrial pneumatic pulsator. The numerical simulation has led to change the piston shape which is moving inside the head of the pulsator, and therefore, to reduce the pressure losses during the airflow. A stress analysis of the pulsator controller body has been carried out while the numerical simulation investigation part of the whole project. The analysis has made possible the change of the controller body material from cast iron to aluminium alloy.

Modeling of the Stress-Dependent Hysteretic Dynamics of Ferroelectric Materials

2014 ◽  
Vol 941-944 ◽  
pp. 606-609 ◽  
Author(s):  
Wei Feng Chen ◽  
Lin Xiang Wang ◽  
Fu Zai Lv
Keyword(s):  
Numerical Simulations ◽  
Hysteresis Loops ◽  
Ferroelectric Materials ◽  
Engineering Applications ◽  
Differential Model ◽  
Polarization Orientation ◽  
Stress Dependent ◽  
Theoretical Results ◽  
Combined Loadings

In the most of its engineering applications, ferroelectric materials are often subjected to combined loadings in the electric and mechanical fields. To simulate the influence of the biased stresses on the hysteretic dynamics of the materials, a macroscopic differential model is proposed to model the hysteresis loops and butterfly-shaped behaviors caused by the polarization orientation switching with biased stresses. A group of numerical simulations are presented, and the comparison of theoretical results with its experimental counterparts is also presented.

scholarly journals On explicit Wiener–Hopf factorization of 2 × 2 matrices in a vicinity of a given matrix

2020 ◽  
Vol 476 (2238) ◽  
pp. 20200027 ◽  
Author(s):  
L. Ephremidze ◽  
I. Spitkovsky
Keyword(s):  
Numerical Simulations ◽  
Matrix Function ◽  
Factorization Method ◽  
Spectral Factorization ◽  
Engineering Applications ◽  
Partial Indices ◽  
Matrix Spectral Factorization

As it is known, the existence of the Wiener–Hopf factorization for a given matrix is a well-studied problem. Severe difficulties arise, however, when one needs to compute the factors approximately and obtain the partial indices. This problem is very important in various engineering applications and, therefore, remains to be subject of intensive investigations. In the present paper, we approximate a given matrix function and then explicitly factorize the approximation regardless of whether it has stable partial indices. For this reason, a technique developed in the Janashia–Lagvilava matrix spectral factorization method is applied. Numerical simulations illustrate our ideas in simple situations that demonstrate the potential of the method.

Independent Suspension of Invariable Alignment Parameters by Using Flexible Links With Anisotropic Elasticity

2014 ◽  
Vol 6 (4) ◽  
Author(s):  
Jing-Shan Zhao ◽  
Jian-Yi Wang ◽  
Fulei Chu ◽  
Jian S. Dai
Keyword(s):  
Numerical Simulations ◽  
Model Test ◽  
Kinematic Chain ◽  
Anisotropic Elasticity ◽  
Flexible Link ◽  
Engineering Applications ◽  
Flexible Links ◽  
Kinematic Chains ◽  
Internal Forces ◽  
Lateral Deflections

This paper investigates an independent suspension with invariable alignment parameters by using flexible links of anisotropic elasticity. It focuses on the synthesis of elasticity of compliant flat links and establishes the mapping from the internal forces during jounce and rebound to the perturbation of the alignment parameters of the knuckle. The equivalent substitution of a flexible link to the infinite-R kinematic chain is first discussed by investigating the free motion and constraint of planar R-type kinematic chains. The rigid guidance capability of the suspension is then discussed from the viewpoint of perturbations of alignment parameters via investigating the lateral deflections of the anisotropic flexible links. At last the rib strengthened double level links on each side of the knuckle are proposed for engineering applications. Numerical simulations and model test show that this kind of suspension can provide very good alignment for the wheel.

Symmetrically scaled coexisting behaviors in two types of simple jerk circuits

Circuit World ◽  
2020 ◽  
Vol 47 (1) ◽  
pp. 61-70
Author(s):  
Mengjie Hua ◽  
Shuo Yang ◽  
Quan Xu ◽  
Mo Chen ◽  
Huagan Wu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Numerical Simulations ◽  
Design Methodology ◽  
Experimental Measurements ◽  
Equilibrium Stability ◽  
Feedback Channel ◽  
Engineering Applications ◽  
Content Type ◽  
Resistive Feedback ◽  
Attraction Basins

Purpose The purpose of this paper is to develop two types of simple jerk circuits and to carry out their dynamical analyses using a unified mathematical model. Design/methodology/approach Two types of simple jerk circuits only involve a nonlinear resistive feedback channel composited by a nonlinear device and an inverter. The nonlinear device is implemented through parallelly connecting two diode-switch-based series branches. According to the classifications of switch states and circuit types, a unified mathematical model is established for these two types of simple jerk circuits, and the origin symmetry and scale proportionality along with the origin equilibrium stability are thereby discussed. The coexisting bifurcation behaviors in the two types of simple jerk systems are revealed by bifurcation plots, and the origin symmetry and scale proportionality are effectively demonstrated by phase plots and attraction basins. Moreover, hardware experimental measurements are performed, from which the captured results well validate the numerical simulations. Findings Two types of simple jerk circuits are unified through parallelly connecting two diode-switch-based series branches and a unified mathematical model with six kinds of nonlinearities is established. Especially, the origin symmetry and scale proportionality for the two types of simple jerk systems are discussed quantitatively. These jerk circuits are all simple and inexpensive, easy to be physically implemented, which are helpful to explore chaos-based engineering applications. Originality/value Unlike previous works, the significant values are that through unifying these two types of simple jerk systems, a unified mathematical model with six kinds of nonlinearities is established, upon which symmetrically scaled coexisting behaviors are numerically disclosed and experimentally demonstrated.

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