scholarly journals Simplified mathematical model for frontal impact study

2021 ◽  
Vol 1037 (1) ◽  
pp. 012055
Author(s):  
A M Manea ◽  
D Iozsa ◽  
C Stan
Keyword(s):  
Mathematical Model ◽  
Impact Study ◽  
Frontal Impact ◽  
Simplified Mathematical Model

scholarly journals Development of a simplified mathematical model for a foil gas bearing operation

2020 ◽  
Vol 1675 ◽  
pp. 012070
Author(s):  
V V Volkov-Muzylev ◽  
Yu A Borisov ◽  
V N Beschastnykh
Keyword(s):  
Mathematical Model ◽  
Gas Bearing ◽  
Simplified Mathematical Model

Research on Flux Damping Control Strategy of DFIG during Grid Voltage Dips

2015 ◽  
Vol 713-715 ◽  
pp. 756-759
Author(s):  
Xu Guang Zhang ◽  
Zhen Xie
Keyword(s):  
Mathematical Model ◽  
Control Strategy ◽  
Grid Voltage ◽  
Damping Control ◽  
Simulink Simulation ◽  
Voltage Dips ◽  
Simulation Results ◽  
Stator Flux ◽  
Natural Component ◽  
Simplified Mathematical Model

A flux damping control strategy was proposed to accelerate the decay of stator flux and restrain stator, rotor current and torque oscillation caused by grid voltage dips. Firstly, this paper analyzes the simplified mathematical model of DFIG during symmetrical voltage dips. Then, the mechanism of flux damping control strategy to restrain stator, rotor current oscillation and increase flux damping was analyzed. The flux damping control strategy can increase the damping of stator side, which accelerates the decay of the stator flux natural component and improve the dynamic LVRT performance of DFIG. The correctness and effectiveness of this method is verified by MATLAB/Simulink simulation results.

scholarly journals Mathematical model to estimate of the deterioration of wooden poles in contact with soil used in rural areas

2011 ◽  
Vol 31 (5) ◽  
pp. 1015-1026
Author(s):  
Julio C. Molina ◽  
Carlito Calil Júnior ◽  
Roberto R. de Freitas
Keyword(s):  
Mathematical Model ◽  
Rural Areas ◽  
Sao Paulo ◽  
São Paulo ◽  
Climatological Data ◽  
Paulo State ◽  
São Paulo State ◽  
Useful Life ◽  
Wooden Structures ◽  
Simplified Mathematical Model

In São Paulo State, mainly in rural areas, the utilization of wooden poles is observed for different purposes. In this context, wood in contact with the ground presents faster deterioration, which is generally associated to environmental factors and, especially to the presence of fungi and insects. With the use of mathematical models, the useful life of wooden structures can be predicted by obtaining "climatic indexes" to indicate, comparatively among the areas studied, which have more or less tendency to fungi and insects attacks. In this work, by using climatological data of several cities at São Paulo State, a simplified mathematical model was obtained to measure the aggressiveness of the wood in contact with the soil.

A FEM Frontal Impact Study of Square-Section Tubes with Different Structural Solutions for Vehicle Safety

2015 ◽  
Vol 798 ◽  
pp. 36-40
Author(s):  
Ciro Faria Maia ◽  
Guilherme Silame Maranhão Lima ◽  
Felipe Grossi L. Amorim ◽  
Evandro Queiroz Nunes Vera ◽  
Alexander Matioli Pasqual
Keyword(s):  
Cross Sections ◽  
Initial Velocity ◽  
Impact Analysis ◽  
Vehicle Safety ◽  
Impact Study ◽  
Frontal Impact ◽  
Structural Differences ◽  
Rigid Plane ◽  
Structural Solutions

The present paper presents a study of square-section tubes conditioned to a FE dynamic frontal impact analysis, considering a 10.0 m/s initial velocity against an infinitely rigid plane. A 50.0 kg punctual mass is positioned on center of the cross-sections, on the farthest side from the rigid plane and the deceleration pulse is measured along the simulations. After validating the numerical model with analytical solutions, the results are compared for four geometries with little structural differences in order to access the role of each difference on the geometry under crash situations. The results show that adding many triggers to the geometry may not be the best performance solution for crash boxes, since the geometry with few triggers achieved better values of deceleration peak than the others. In addition, the presence of holes showed to be an instability cause to the system. The structural solutions presented could be of great value for future vehicle crash box developments.

scholarly journals A SIMPLIFIED MATHEMATICAL MODEL OF THE EFFECT OF GAZ HYDRATES ON INTRA-TUBE CORROSION

2017 ◽  
Vol 27 (6) ◽  
pp. 150-153
Author(s):  
L. Ya. Poberezhnyi ◽  
A. V. Hrytsanchuk ◽  
S. M. Petrushchak
Keyword(s):  
Mathematical Model ◽  
Simplified Mathematical Model

scholarly journals Tail-Actuator Propulsion Device for Aquatic Robot

2006 ◽  
Vol 18 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Andrea Manuello Bertetto ◽  
◽  
Maurizio Ruggiu
Keyword(s):  
Mathematical Model ◽  
Numerical Procedure ◽  
Numerical Data ◽  
Operating Principle ◽  
The Other ◽  
Kinematics And Dynamics ◽  
Experimental Characterization ◽  
Fish Propulsion ◽  
Geometrical Dimensions ◽  
Simplified Mathematical Model

In this paper an aquatic device inspired to the fish propulsion is proposed. At the first, the operating principle of the fluidic actuator and its experimental characterization are presented. Then, the results of numerous tests carried out on the integrated tail-actuator device are shown either in terms of thrust exerted or as biomorphism of its kinematics. The tests were run at several driven frequencies with different fins depending on their geometrical dimensions and compliances. On the other hand, a simplified mathematical model of the propulsion system, based on the calculation of the instantaneous tail kinematics and dynamics by means of a numerical procedure, is proposed with the aim of simulating performances either in terms of thrust exerted or kinematics behavior. Finally a discussion about the results obtained and a comparison between experimental and numerical data are presented.

scholarly journals A Simplified Mathematical Model and Simulations of the Hypophysis-Ovarian Endocrine Control System

1969 ◽  
Vol 9 (3) ◽  
pp. 278-291 ◽  
Author(s):  
Henry E. Thompson ◽  
James D. Horgan ◽  
Eleanor Delfs
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Endocrine Control ◽  
Simplified Mathematical Model

scholarly journals Analysis and Simulation about a Simplified Model for Modulation and Demodulation of Ship-borne Single Channel Monopulse Radar

2018 ◽  
Vol 232 ◽  
pp. 04043
Author(s):  
Xudong Zhang ◽  
Haiyu Ji
Keyword(s):  
Mathematical Model ◽  
Single Channel ◽  
Simplified Model ◽  
Modulation And Demodulation ◽  
Pulse Radar ◽  
Factors Influencing ◽  
Simplified Mathematical Model

A simplified mathematical model for modulation and demodulation of a single channel monopulse (SCM) system is proposed, which is based on a ship-borne pulse radar S-band guided receiver. Using the proposed mathematical model, the modulation and demodulation of single-channel and multi-channel signals were simulated respectively, and the factors influencing the modulation and demodulation of the SCM system were analysed.

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