Two-dimensional electromagnetic environment simulation based on digital map

2014 ◽  
Vol 26 (7) ◽  
pp. 73211
Author(s):  
白瑞杰 Bai Ruijie ◽  
廖成 Liao Cheng ◽  
盛楠 Sheng Nan ◽  
张青洪 Zhang Qinghong ◽  
李瀚宇 Li Hanyu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Electromagnetic Environment ◽  
Digital Map ◽  
Simulation Based ◽  
Environment Simulation

Investigation of Contact Conditions During Stamping of a Thin Plate

2020 ◽  
Author(s):  
Harshal Y. Shahare ◽  
Rohan Rajput ◽  
Puneet Tandon
Keyword(s):  
Wave Propagation ◽  
Material Properties ◽  
High Speed ◽  
Fdtd Method ◽  
Propagation Model ◽  
Transmitted Wave ◽  
Two Dimensional ◽  
Contact Conditions ◽  
Simulation Based ◽  
Difference Time

Abstract Stamping is one of the most used manufacturing processes, where real-time monitoring is quite difficult due to high speed of the mechanical press, which leads to deterioration of the accuracy of the products In the present work, a method is developed to model elastic waves propagation in solids to measure contact conditions between die and workpiece during stamping. A two-dimensional model is developed that reduces the wave propagation equations to two-dimensional equations. To simulate the wave propagation inside the die-workpiece model, the finite difference time domain (FDTD) method and modified Yee algorithm has been employed. The numerical stability of the wave propagation model is achieved through courant stability condition, i.e., Courant-Friedrichs-Lewy (CFL) number. Two cases, i.e., flat die-workpiece interface and inclined die-workpiece interface, are investigated in the present work. The elastic wave propagation is simulated with a two-dimension (2D) model of the die and workpiece using reflecting boundary conditions for different material properties. The experimental and simulation-based results of reflected and transmitted wave characteristics are compared for different materials in terms of reflected and transmitted wave height ratio and material properties such as acoustic impedance. It is found that the numerical simulation results are in good agreement with the experimental results.

scholarly journals Computation and validation of two-dimensional PSF simulation based on physical optics

2015 ◽  
Author(s):  
K. Tayabaly ◽  
D. Spiga ◽  
G. Sironi ◽  
R. Canestrari ◽  
M. Lavagna ◽  
...  
Keyword(s):  
Physical Optics ◽  
Two Dimensional ◽  
Simulation Based

GMSK Modulation Design in General Hardware-in-the-Loop Communication Simulator

2012 ◽  
Vol 182-183 ◽  
pp. 602-605
Author(s):  
Qian Zhang
Keyword(s):  
Wireless Communications ◽  
Design Thinking ◽  
Software Radio ◽  
Hardware In The Loop ◽  
Electromagnetic Environment ◽  
Communication Signals ◽  
Software Simulation ◽  
Reference Simulation ◽  
Environment Simulation ◽  
Communication Equipment

Hardware-in-the-loop communication equipment simulation is an important step of the development about communications and electromagnetic environment simulation. Reference to the "software radio" design thinking, the source library is generated by the software and different communication signals are generated by the fixed hardware frame. The system achieves “versatility”. GMSK in wireless communications has been widely applied. It is one of the important signals generated by the simulator. Based on analysis of the structure, the paper introduces the design of the simulator. It also provides the software simulation of Matlab. It provides a reference simulation for communications equipment and electromagnetic environment simulation.

Alignments in two-dimensional random sets of points

1980 ◽  
Vol 12 (02) ◽  
pp. 380-424 ◽  
Author(s):  
David G. Kendall ◽  
Wilfrid S. Kendall
Keyword(s):  
Random Sets ◽  
Two Dimensional ◽  
Significance Tests ◽  
Random Mechanism ◽  
Asymptotic Formulae ◽  
Simulation Based ◽  
Data Analytic ◽  
Analytic Problem ◽  
Associated Data

Let n points in the plane be generated by some specified random mechanism and suppose that N(∊) of the resulting triads form triangles with largest angle ≧ π – ∊. The main object of the paper is to obtain asymptotic formulae for and Var (N(∊)) when ∊ ↓ 0, and to solve the associated data-analytic problem of testing whether an empirical set of n points should be considered to contain too many such ∊-blunt triads in the situation where the generating mechanism is unknown and where all that can be said about the tolerance ∊ is that it must be allowed to take values anywhere in a given interval (T 0, T 1) (0 < T 0 < T 1). This problem is solved by the introduction of a plot to be called the pontogram and by the introduction of simulation-based significance tests constructed by random lateral perturbations of the data.

Determining Model Accuracy as a Function of Inputs and System Parameters

2004 ◽  
Author(s):  
Bryon J. Sohns ◽  
Jeffrey L. Stein ◽  
Loucas S. Louca
Keyword(s):  
Cell Model ◽  
Two Dimensional ◽  
Hydrogen Fuel Cell ◽  
Model Accuracy ◽  
Model Quality ◽  
System Parameters ◽  
Promising Tool ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Dimensional Range

Vital to the effectiveness of simulation-based design is having a system model of known quality. Previous research introduced an algorithm called AVASIM for assessing model validity systematically and quantitatively. AVASIM assess the accuracy and validity of a model based on a specific input and set of system parameters. The purpose of this paper is to present a AVASIM-based methodology that defines a range of validity of a model with respect to input and system parameter variations Two illustrative examples are presented to explore the feasibility of the proposed procedure. The first example analyzes a linearized version of a nonlinear transient vehiclehandling model. This model’s accuracy and validity are evaluated with respect to variation of two system parameters, resulting in a two-dimensional range of validity. Then a complex nonlinear hydrogen fuel cell model is linearized in order to investigate its accuracy and validity with respect to two input parameters. This again results in a two-dimensional range of validity, but with respect to input rather than system parameters. The results agree well with what is expected for the various models based on knowledge of the effects of linearization on model accuracy. The proposed algorithm for assessing model range of validity is a promising tool for determining model quality and thus potentially useful for simulation-based design.

scholarly journals Research on Electromagnetic Environment Situation Display of Digital Map Radar based on 3D GIS

2020 ◽  
Vol 1550 ◽  
pp. 042071
Author(s):  
Guo Shichao ◽  
Guo Dandan ◽  
Zhang Qiongyu ◽  
Wu Nankai ◽  
Deng Jiaxin
Keyword(s):  
3D Gis ◽  
Electromagnetic Environment ◽  
Digital Map

Simulation-Based Ship Production Using Three-Dimensional CAD

2006 ◽  
Vol 22 (03) ◽  
pp. 155-159
Author(s):  
Yasuhisa Okumoto ◽  
Kentaro Hiyoku ◽  
Noritaka Uesugi
Keyword(s):  
Computer Aided Design ◽  
Complex Shape ◽  
Three Dimensional ◽  
Computer Integrated Manufacturing ◽  
Digital Manufacturing ◽  
Two Dimensional ◽  
Ship Structure ◽  
Cad System ◽  
Simulation Based ◽  
Aided Design

The application of three-dimensional computer-aided design (CAD) is becoming more popular for design and production in many industrial fields, and digital manufacturing is spreading. With preconstruction simulation of the production process using a three-dimensional digital model, which is a core of a computer-integrated manufacturing (CIM) system, the efficiency and safety of production can be improved at each stage of work and optimization of manufacturing can be achieved. This paper first describes the concept of simulation-based production in shipbuilding and digital manufacturing. The three-dimensional CAD system is indispensable for effective simulation because the ship structure is three-dimensionally complex, and threedimensional viewer software enables workers to examine structures on a computer display. With simulation, computer-optimized manufacturing is possible. Simulation is most effective for jobs in which many parties must cooperate to handle structures or equipment of complex shape. Two-dimensional drawings are inadequate for imaging whole figures in such cases. Some examples of the successful applications in IHI Marine United, Inc., are shown: erection of a complex hull block, scaffolding planning, and installation of a rudder.

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