Software Tool for Acausal Physical Modelling and Simulation

Multiple laser beams and single-mode optical fibers output can be approximated by assuming that the emitted light has a symmetrical Gaussian intensity profile, which corresponds to the transverse electromagnetic mode (TEM00), which is designated as a Gaussian beam. Current free-accessible design tools are limited to the spatial analysis of the beams, in general, and to the intensity, in particular, and to the graphical visualization in 2D with very limited options. In this work, a novel a computer-aided laser-fiber output beam TEM00 designer, CATEM00, is presented based on the 3D representations typically provided by camera beam profilers, and on the fundamentals of the wave theory of light, including diverse flexibility capabilities for graphical manipulation and parameter comprehension both in terms of spatial behavior and in angular confinement. It must be highlighted that not only is the spatial limitation design of light impact relevant in TEM00 applications but, also, the angle with which the light reaches the target. Hence, the availability of capabilities of phase design in TEM00 following the paraxial limitations is highly convenient. Results and discussion in terms of intensity, power, divergence and wave fronts are presented considering a set of study cases, showing its coherence with Gaussian beam theory.

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“…where substituting Equation (11) gives us the following expression for the power of the Gaussian beam:…”

Section: Spatial Dimensionmentioning

confidence: 99%

Computer-Aided Laser-Fiber Output Beam 3D Spatial and Angular Design

et al. 2020

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“…Similarly, acausal and object-oriented approaches can offer many advantages in system engineering research for both the exchange of modeling knowledge 20–22 and the building of complex multidisciplinary models, when dynamics are given by a set of differential algebraic equations (DAEs) or a block diagram instead. The object-oriented approach has been made possible by using the modeling language MODELICA 23,24 and the MATLAB-based modeling module SIMSCAPE, 25 together with the linked domain libraries, SimELECTRONICS, SimHYDRAULICS, and SimMECHANICS.…”

Section: Introductionmentioning

confidence: 99%

Ship-course modeling and control using the SIMSCAPE physical modeling environment

Cañete

Martin-Aguilar

2020

SIMULATION

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Simulation is an important tool for evaluating the design of a ship-course control system. The object-oriented modeling supports the physical modeling of a multi-domain dynamical system by using a hierarchical acausal structure, as compared to block diagrams or differential equation-based causal structures. In this paper we describe the use of the SIMSCAPE simulation environment for the physical modeling-based design of the course control system of a ship. The complete model has been implemented by using this physical modeling approach whereby dynamic system equations are transformed into a diagram of interconnected physical blocks so as to represent in this way the true structure of the modeled system. The performance of the course control of the ship model was analyzed by simulation in light of the existing hypothesis and indirect validation tests previously performed with operational data. The results obtained by using sequences of course-changing maneuvers with varying disturbances serve to demonstrate the usefulness of the physical modeling-based approach with high accuracy and small computational cost as compared to the classical differential equation-based or the adimensional block-oriented diagrams. This methodology can be easily extended to other engineering fields provided that a suitable set of SIMSCAPE physical libraries can be used (electrical, mechanical, hydraulics, thermal,…). In fact, the ship-course control system model here developed represents an interesting benchmark in the field of engineering systems to get insight on the physical modeling approach under SIMSCAPE or even under MODELICA, despite its specificity to marine systems.

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Software Tool for Acausal Physical Modelling and Simulation

Cited by 2 publications

References 48 publications

Computer-Aided Laser-Fiber Output Beam 3D Spatial and Angular Design

Computer-Aided Laser-Fiber Output Beam 3D Spatial and Angular Design

Ship-course modeling and control using the SIMSCAPE physical modeling environment

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