scholarly journals Real-time simulation of a fragmenting explosion for cylindrical warheads

2021 ◽  
pp. 154851292199556
Author(s):  
David Felix ◽  
Ian Colwill ◽  
Paul Harris
Keyword(s):  
Real Time ◽  
Element Analysis ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Protection Systems ◽  
Active Protection ◽  
Execution Times ◽  
Real Time Simulations ◽  
Time Systems ◽  
The Impact

Explosion models based on finite element analysis (FEA) can be used to simulate how a warhead fragments. However, their execution times are extensive. Active protection systems need to make very fast predictions, before a fast attacking weapon hits the target. Fast execution times are also needed in real-time simulations where the impact of many different computer models is being assessed. Hence, FEA explosion models are not appropriate for these real-time systems. As a trade-off between accuracy and execution time, this paper creates a simulation of fragments from a warhead’s explosion, using simple analytical equations. The results are verified against explosion experimental data and FEA results. The developed model then can be made available for real-time simulation and fast computation.

scholarly journals High-Speed Real-Time Simulators for Engineering Design

10.14311/738 ◽  
2005 ◽  
Vol 45 (4) ◽  
Author(s):  
R. E. Crosbie ◽  
N. G. Hingorani
Keyword(s):  
Engineering Design ◽  
Real Time ◽  
Computer Simulations ◽  
High Speed ◽  
Operator Training ◽  
Real Time Simulation ◽  
Automotive Systems ◽  
Simulated Environments ◽  
Time Simulation ◽  
Real Time Simulations

The use of computer simulations is now an established technique in engineering design. Many of these simulations are used to predict the expected behavior of systems that are not yet built, or of existing systems in modes of operation, such as catastrophic failure, in which it is not feasible to test the real system. Another use of computer simulations is for training and testing purposes in which the simulation is interfaced to real hardware, software and/or a human operator and is required to operate in real-time. Examples are plant simulators for operator training or simulated environments for testing hardware or software components. The primary requirement of a real-time simulation is that it must complete all the calculations necessary to update the simulator outputs as well as all the necessary data I/O within the allotted frame time. Many real-time simulations use frame times in the range of a few milliseconds and greater.There is an increasing number of applications, for example in power electronics and automotive systems, in which much shorter frame rates are required. This paper reviews some of these applications and the approaches to real-time simulation that can achieve frame times in the range 5 to 100 microseconds. 

Execution Times Reconstruction in a LTI System Real-time Simulation

2014 ◽  
Vol 12 (2) ◽  
pp. 277-284 ◽  
Author(s):  
Jorge Salvador Valdez Martinez ◽  
Pedro Guevara Lopez ◽  
Gustavo Delgado Reyes
Keyword(s):  
Real Time ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Lti System ◽  
Execution Times

The Rate of Turn Required for Geographically Fixed Turns: A Formula and Fast-Time Simulations

2000 ◽  
Vol 53 (1) ◽  
pp. 146-155 ◽  
Author(s):  
Max J. van Hilten ◽  
Paul H. M. Wolkenfelt
Keyword(s):  
Real Time ◽  
Simulation Program ◽  
Fast Time ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Tidal Stream ◽  
Path Prediction ◽  
Real Time Simulations ◽  
Hydrodynamic Effects ◽  
The Relationship

This paper concerns the derivation of a formula to follow geographically fixed turns in a homogeneous current or tidal stream. Until now, various well-founded but limited approximations have been used. In principle, all these approximations are based on the formula v = ω × R. One result of this research is the development and use of a fast-time simulation program. The initial aim was to illustrate to trainees the consequences and, in particular, the possible dangers of these approximations. The fast-time simulation program can be used in support of real-time simulation. Comparisons with real-time simulations carried out by the Dutch Pilots' Corporation (STODEL) indicate that the fast-time simulations generate turning-circle diameters that differ by a maximum 4 percent. The relationship with path-prediction is also dealt with. The possibility of applying the developed formulae in practice and for passage planning is currently under investigation. The fast-time simulation program has not been developed for one specific ship: apart from the use of an assumed position of the pivoting point at 1/3 of the ship's length from the bow, it does not take hydrodynamic effects into account.

scholarly journals Reduced-Scale Models of Variable Speed Hydro-Electric Plants for Power Hardware-in-the-Loop Real-Time Simulations

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5764
Author(s):  
Baoling Guo ◽  
Amgad Mohamed ◽  
Seddik Bacha ◽  
Mazen Alamir ◽  
Cédric Boudinet ◽  
...  
Keyword(s):  
Real Time ◽  
Simulation System ◽  
Hardware In The Loop ◽  
Variable Speed ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Scale Models ◽  
Real Time Simulations ◽  
Reduced Scale ◽  
Modelling Approach

Variable Speed Hydro-Electric Plant (VS-HEP) equipped with power electronics has been increasingly introduced into the hydraulic context. This paper is targeting a VS-HEP Power Hardware-In-the-Loop (PHIL) real-time simulation system, which is dedicated to different hydraulic operation schemes tests and control laws validation. Then, a proper hydraulic model will be the key factor for building an efficient PHIL real-time simulation system. This work introduces a practical and generalised modelling hydraulic modelling approach, which is based on ‘Hill Charts’ measurements provided by industrial manufacturers. The hydraulic static model is analytically obtained by using mathematical optimization routines. In addition, the nonlinear dynamic model of the guide vane actuator is introduced in order to evaluate the effects of the induced dynamics on the electric control performances. Moreover, the reduced-scale models adapted to different laboratory conditions can be established by applying scaling laws. The suggested modelling approach enables the features of decent accuracy, light computational complexity, high flexibility and wide applications for their implementations on PHIL real-time simulations. Finally, a grid-connected energy conversion chain of bulb hydraulic turbine associated with a permanent magnet synchronous generator is chosen as an example for PHIL design and performance assessment.

scholarly journals Power Quality Assessment of the Interconnection of a Microgrid to a local distribution system using Real-Time Simulation

DYNA ◽  
2020 ◽  
Vol 87 (213) ◽  
pp. 28-33
Author(s):  
Juan Geronimo Villarreal Montoya ◽  
Eduardo Gomez Luna ◽  
Eduardo Marlés Sáenz
Keyword(s):  
Real Time ◽  
Power Quality ◽  
Distribution System ◽  
Transmission System ◽  
Current Harmonics ◽  
Real Time Simulation ◽  
Time Simulation ◽  
International Power ◽  
The Impact ◽  
Voltage Harmonics

This article assesses the impact on the Power Quality produced by the interconnection of a microgrid to a transmission system, real-time simulation have been used to carry out the study, applying national and international power quality standards, IEEE 1547 of 2018, IEEE 519 of 2014 and NTC 5001 of 2008. The phenomena of voltage harmonics, current harmonics, flicker and DC injection were evaluated on a microgrid case study. The results show that the interconnection of the microgrid produces a high impact on the current harmonics and the DC injection of the local transmission system, while the flicker phenomena and voltage harmonics have a smaller impact.

Object-Oriented Modeling for Real-Time Simulation

2000 ◽  
Author(s):  
Miguel A. Otaduy ◽  
Ana I. Martínez ◽  
Ana Vidarte ◽  
Joseba Landaluze ◽  
Raúl Reyero
Keyword(s):  
Real Time ◽  
Mathematical Formulation ◽  
Object Oriented ◽  
Simulation Models ◽  
Mechatronic Systems ◽  
Modeling Tools ◽  
Real Time Simulation ◽  
Time Simulation ◽  
New Applications ◽  
Real Time Simulations

Abstract The fast growing processing capability of digital circuits allows real-time simulation of mechatronic systems to embrace new applications at a lower cost. However, the development of real-time simulation models is still a difficult task. Object-oriented modeling, along with efficient mathematical formulation, seems to solve this matter. The work covered by this paper was carried out in order to evaluate existing possibilities for the development of real-time simulations of mechatronic systems by means of object-oriented modeling tools.

Real-Time Simulation of Multiple Parallel Approaches

1993 ◽  
Vol 37 (17) ◽  
pp. 1191-1195
Author(s):  
Eric C. Neiderman
Keyword(s):  
Real Time ◽  
Traffic Control ◽  
National Standards ◽  
Flight Crew ◽  
Human Capabilities ◽  
Real Time Simulation ◽  
Airport Capacity ◽  
Time Simulation ◽  
Aircraft Performance ◽  
Real Time Simulations

This paper describes an ongoing program of real-time, interactive air traffic control simulations to test and evaluate the feasibility of conducting closely-spaced, Independent, instrument approaches to dual, triple, and quadruple parallel runways. Real-time simulations are used to test and evaluate the human, technological, and systemic issues critical to the implementation of independent multiple parallel approaches. These simulations quantitatively evaluate controller performance, pilot/aircraft performance, and airport capacity issues. Simulation data are also used in the assessment of risk associated with the operation. To address human capabilities and limitations, qualitative analyses are used to assess the opinions of controllers, flight crew members, simulation technical observers, and recognized subject matter experts. This paper describes the planning, implementation, data collection, analysis, and related issues involved in real-time simulation for the development of national standards for independent multiple parallel approaches.

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