Airborne Weather Radar Cloud Simulation Based on Fractal Theory

2014 ◽  
Vol 909 ◽  
pp. 423-427
Author(s):  
Zhi Chun Zhang ◽  
Wen Xu ◽  
Zhuang Xiong ◽  
Kun Xu ◽  
Song Yan Lu
Keyword(s):  
Locus Of Control ◽  
Data Model ◽  
Fractal Theory ◽  
Weather Radar ◽  
Simulation Method ◽  
Cloud Data ◽  
Weighted Fusion ◽  
Simulation Based ◽  
Radar Simulator ◽  
Control Surfaces

This paper describes a cloud simulation method of an airborne weather radar simulator based on the atmosphere characteristics of real clouds. With the fractal theory, an improved Successive Random Additions (SRA) to instruct cloud data modeling was chosen and an appropriate locus of control surfaces was selected. On the basis of the locus of control surfaces and the surface generated in the way of fractal this surface, weighted fusion generated a predetermined shape of the cloud data model. According to the generating rules, the data model was mapped to color values in the corresponding points, and the corresponding relation between height and color values was constructed. Finally, the screen cloud image of the airborne weather radar was drawn. The implementation shows that the method is real time and can be used to generate satisfied simulation radar image.

scholarly journals 3D Tree Modeling and Visualization Simulation Based on Fractal

2013 ◽  
Vol 347-350 ◽  
pp. 2869-2873
Author(s):  
Xu Dong Xu ◽  
Jing Qing Ye ◽  
Guan Feng Lv
Keyword(s):  
Control Function ◽  
Fractal Theory ◽  
Morphological Characteristics ◽  
Simulation Method ◽  
C Language ◽  
Automated Generation ◽  
Simulation Based ◽  
Tree Modeling ◽  
Developing Platform ◽  
Visualization Simulation

In this paper, we propose a 3D tree simulation method which is based on fractal theory and combined with the morphological characteristics of trees. By modifying a few simple parameters we can achieve the realization of different types of 3D tree automated generation. According to the tree structure fractal self-similar characteristic, combined with the morphological characteristics of the trees, we abstract identified class to realize the description of each organs attributes and functions; Using random control function to improve the fractal iterative methods to make the generated trees more realistic; With the help of the developing platform of Visual C++ language and OpenGL, we can realize 3DTrees optimize modeling and visualization simulation. Experiments show that the method generates visually convincing results.

Advanced Polarimetric Doppler Weather Radar Simulator

2014 ◽  
Author(s):  
S. Lischi ◽  
A. Lupidi ◽  
M. Martorella ◽  
F. Cuccoli ◽  
L. Facheris ◽  
...  
Keyword(s):  
Weather Radar ◽  
Doppler Weather Radar ◽  
Radar Simulator

scholarly journals From behavioural simulation to computer models: how simulation can be used to improve healthcare management and policy

2018 ◽  
Vol 6 (2) ◽  
pp. 95-102 ◽  
Author(s):  
Guillaume Lamé ◽  
Rebecca K Simmons
Keyword(s):  
Computer Simulations ◽  
Policy Making ◽  
Simulation Method ◽  
Healthcare Management ◽  
Policies And Procedures ◽  
Simulation Based ◽  
Behavioural Simulation ◽  
Human Participants ◽  
New Policies

Simulation is a technique that evokes or replicates substantial aspects of the real world, in order to experiment with a simplified imitation of an operations system, for the purpose of better understanding and/or improving that system. Simulation provides a safe environment for investigating individual and organisational behaviour and a risk-free testbed for new policies and procedures. Therefore, it can complement or replace direct field observations and trial-and-error approaches, which can be time consuming, costly and difficult to carry out. However, simulation has low adoption as a research and improvement tool in healthcare management and policy-making. The literature on simulation in these fields is dispersed across different disciplinary traditions and typically focuses on a single simulation method. In this article, we examine how simulation can be used to investigate, understand and improve management and policy-making in healthcare organisations. We develop the rationale for using simulation and provide an integrative overview of existing approaches, using examples of in vivo behavioural simulations involving live participants, pure in silico computer simulations and intermediate approaches (virtual simulation) where human participants interact with computer simulations of health organisations. We also discuss the combination of these approaches to organisational simulation and the evaluation of simulation-based interventions.

Modeling and Analysis of a Digital Hydraulic Actuator for Flight Control Surfaces

2021 ◽  
Author(s):  
R. S. Lopes ◽  
M. P. Nostrani ◽  
L. A. Carvalho ◽  
A. Dell’Amico ◽  
P. Krus ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Flight Control ◽  
Data Model ◽  
Flight Performance ◽  
Hydraulic Actuator ◽  
Hydraulic Power ◽  
Fighter Aircraft ◽  
Modeling And Analysis ◽  
Modeling Process ◽  
Control Surfaces

Abstract This paper presents the design and modeling process of a flight control actuator using digital hydraulics and a performance analysis that compares the proposed solution and the Servo Hydraulic Actuator (SHA) on a fighter aircraft model. The proposed solution is named Digital Hydraulic Actuator (DHA) and comprises the use of a multi-chamber cylinder controlled by on/off valves and different pressures sources provided by a centralized hydraulic power unit, as proposed in the Fly-by-Wire (FbW) concept. The analyses were carried out using the Aero-Data Model in a Research Environment (ADMIRE), which was developed for flight performance analysis. The actuators were modeled using the software Matlab/Simulink® and Hopsan. They were applied to control the aircraft elevons in a flight mission close to the aircraft limits, to evaluate the actuator’s behavior and energy efficiency. The results show a reduction in energy dissipation up to 22.3 times when comparing the DHA with the SHA, and despite the overshooting and oscillations presented, the aircraft flight stability was not affected.

Motorcycle Dynamics Simulation Based on Real Road Load

2009 ◽  
Vol 16-19 ◽  
pp. 318-322 ◽  
Author(s):  
Xiao Hui Shi ◽  
Xi Hong Zou ◽  
Quan Shi ◽  
Shun Li Xiao
Keyword(s):  
Simulation Method ◽  
Virtual Prototype ◽  
Dynamics Simulation ◽  
The Road ◽  
Virtual Test ◽  
Road Load ◽  
Simulation Based ◽  
Test Platform ◽  
On The Road ◽  
Motorcycle Dynamics

The motorcycle dynamics simulation method based on the road simulation test and virtual prototype is developed, and a rigid-flexible coupling virtual prototype with test platform of motorcycle is created with CATIA, NASTRAN and ADAMS software. According to two-channel tire-coupled road simulator of MTS Systems Corporation, the simulation model and platform are repetitively refined to fairly high precision by comparing simulation results with experimental results. The iterated excitation signal based on real road load or typical spectrum of different roads is imported into the virtual test platform, the comfort and durability tests of motorcycle can be undertaken to replace road simulator, the test period and cost are greatly reduced, and test security is increased.

AN APPROACH TO A DYNAMIC SYSTEM SIMULATION BASED ON HUMAN INFORMATION PROCESSING

2002 ◽  
Vol 10 (06) ◽  
pp. 611-633 ◽  
Author(s):  
ICHIRO KOBAYASHI ◽  
MICHIO SUGENO
Keyword(s):  
Information Processing ◽  
Dynamic System ◽  
Simulation Method ◽  
Human Information Processing ◽  
Linguistic Model ◽  
Simulation Based ◽  
The Future ◽  
Mathematical Equations ◽  
Fixed Structure ◽  
Intellectual Activities

As we know that human intellectual activities are performed by the use of language; a human being thinks and reasons with language. In this paper, we propose a new simulation method which imitates human information processing based on the use of language. — An ordinary simulation method uses mathematical equations to estimate the future trends of a dynamic system, however, we propose a new simulation method which uses a model consists of natural language, which is called a linguistic model. A linguistic model does not have a fixed structure, but the structure of the model itself will be generated so that model should become the most appropriate model to estimate the future behavior of a dynamic system. We regard that human intellectual activities such as thinking, reasoning, etc. are also texts realized by context as well as a linguistic text is done by context. We show a human linguistic reasoning model generation with an example of forecast of foreign exchange rate (FER) changes.

Civil Aircraft Radar Track Simulation Algorithm Based on 4D Trajectory

2014 ◽  
Vol 905 ◽  
pp. 514-518
Author(s):  
Jun Jie Liu ◽  
Li Yu Tian ◽  
Qiu Xiang Wu ◽  
Miao He
Keyword(s):  
Traffic Control ◽  
Air Traffic Control ◽  
Simulation Method ◽  
Practical Significance ◽  
Simulation Algorithm ◽  
Simulation Technology ◽  
Advanced Technologies ◽  
Simulation Based ◽  
Civil Aircraft ◽  
Track Simulation

In this paper, we start from the research on the radar simulation technology, adopt a method based on the 4D trajectory module simulation based on the analysis of the advanced technologies abroad and developing status at home. Following detailed descriptions combined with all the major modules, the integrated radar track simulation method is established. Research and implementation of the technology in the field of air traffic control has great practical significance.

Simulation-based Virtual Prototyping of Customized Catheterization Devices

2004 ◽  
Vol 4 (2) ◽  
pp. 132-139 ◽  
Author(s):  
Y. Y. Cai ◽  
C.-K. Chui ◽  
X. Ye ◽  
J. H. Anderson ◽  
K.-M. Liew ◽  
...  
Keyword(s):  
Virtual Prototyping ◽  
Vascular Anatomy ◽  
Simulation Method ◽  
Therapeutic Interventions ◽  
Patient Specific ◽  
Anatomic Variations ◽  
Pathological Changes ◽  
Time Simulation ◽  
Simulation Based ◽  
Vascular Catheterization

Human vascular systems have considerable anatomic variations. In diseased situation, significant pathological changes will be developed with the systems. However, vascular catheterization devices commercially available are essentially designed on normal or average anatomy. Their inadequacies in representing major deviations in human vascular anatomy may present problems during diagnostic or therapeutic interventions. A virtual reality (VR) based simulation method is described in this paper for prototyping of customized patient-specific catheterization devices. Techniques are developed to model patient-specific vascular network, to design catheterization devices, and to simulate physical-based interactions between blood vessels and the devices. Emphasis is made on the integration of normal and variant vascular models, the integration of modeling, visualization and interaction, and the integration of real-time simulation and virtual prototyping.

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