The Development of a Geometry Engine with Analytic Sensitivities

2012 ◽  
Author(s):  
Nitin Bhagat ◽  
Maxwell Blair ◽  
Alan Shih ◽  
Ronald Taylor
Keyword(s):  
Geometry Engine

Can one design a geometry engine?

2018 ◽  
Vol 85 (2-4) ◽  
pp. 259-291
Author(s):  
Johann A. Makowsky
Keyword(s):  
Geometry Engine

The Geometry Engine

1982 ◽  
Vol 16 (3) ◽  
pp. 127-133 ◽  
Author(s):  
James H. Clark
Keyword(s):  
Geometry Engine

A Visible Framework for Virtual Prototype of Electric Tools

2011 ◽  
Vol 120 ◽  
pp. 61-64
Author(s):  
Jiang Wei Cui ◽  
Qiang Gao ◽  
Jing Li ◽  
Xiang Chen ◽  
Xiao Lei Wang
Keyword(s):  
Real Time ◽  
Virtual Prototype ◽  
Post Processing ◽  
Linear Vibration ◽  
Post Process ◽  
Parameterized Modeling ◽  
Processing Module ◽  
Simulation Results ◽  
Analysis System ◽  
Geometry Engine

This paper developed real-time virtual prototype analysis system of electric tools that consists of pre-processing module, solver module and post processing module. Adopting the OCC (OpenCASCADE) geometry engine, the functions such as parameterized modeling, virtual assembly and visible post process of the geared rotor system of electric tools were realized, simulation results of the virtual prototype analysis of the non-linear vibration is shown effectively.

scholarly journals SPICE TOOLS SUPPORTING PLANETARY REMOTE SENSING

2016 ◽  
Vol XLI-B4 ◽  
pp. 357-359 ◽  
Author(s):  
C. Acton ◽  
N. Bachman ◽  
B. Semenov ◽  
E. Wright
Keyword(s):  
Planetary Science ◽  
Science Data ◽  
Export Restrictions ◽  
Planetary Data System ◽  
Scientists And Engineers ◽  
Ancillary Information ◽  
Java Native Interface ◽  
Observation Geometry ◽  
Geometry Engine ◽  
Shape Data

NASA's "SPICE"<sup>*</sup> ancillary information system has gradually become the de facto international standard for providing scientists the fundamental observation geometry needed to perform photogrammetry, map making and other kinds of planetary science data analysis. SPICE provides position and orientation ephemerides of both the robotic spacecraft and the target body; target body size and shape data; instrument mounting alignment and field-of-view geometry; reference frame specifications; and underlying time system conversions. <br><br> SPICE comprises not only data, but also a large suite of software, known as the SPICE Toolkit, used to access those data and subsequently compute derived quantities–items such as instrument viewing latitude/longitude, lighting angles, altitude, etc. <br><br> In existence since the days of the Magellan mission to Venus, the SPICE system has continuously grown to better meet the needs of scientists and engineers. For example, originally the SPICE Toolkit was offered only in Fortran 77, but is now available in C, IDL, MATLAB, and Java Native Interface. SPICE calculations were originally available only using APIs (subroutines), but can now be executed using a client-server interface to a geometry engine. Originally SPICE "products" were only available in numeric form, but now SPICE data visualization is also available. <br><br> The SPICE components are free of cost, license and export restrictions. Substantial tutorials and programming lessons help new users learn to employ SPICE calculations in their own programs. The SPICE system is implemented and maintained by the Navigation and Ancillary Information Facility (NAIF)–a component of NASA's Planetary Data System (PDS). <br><br> <sup>*</sup> Spacecraft, Planet, Instrument, Camera-matrix, Events

Geometry engine architecture with early backface culling hardware

2005 ◽  
Vol 29 (3) ◽  
pp. 415-425 ◽  
Author(s):  
Chang-Young Han ◽  
Yeon-Ho Im ◽  
Lee-Sup Kim
Keyword(s):  
Geometry Engine

Aircraft conceptual design for optimal environmental performance

2012 ◽  
Vol 116 (1175) ◽  
pp. 1-22 ◽  
Author(s):  
R. P. Henderson ◽  
J. R. R. A. Martins ◽  
R. E. Perez
Keyword(s):  
Operating Cost ◽  
Aircraft Design ◽  
Aircraft Emissions ◽  
Design Optimisation ◽  
Commercial Aviation ◽  
Fuel Burn ◽  
Design Variables ◽  
Multidisciplinary Design Optimisation ◽  
Aircraft Conceptual Design ◽  
Geometry Engine

Abstract Consideration of the environmental impact of aircraft has become critical in commercial aviation. The continued growth of air traffic has caused increasing demands to reduce aircraft emissions, imposing new constraints on the design and development of future airplane concepts. In this paper, an aircraft design optimisation framework is used to design aircraft that minimise specific environmental metrics. Multidisciplinary design optimisation is used to optimise aircraft by simultaneously considering airframe, engine and mission. The environmental metrics considered in this investigation are CO2 emissions — which are proportional to fuel burn — and landing-takeoff NOx emissions. The results are compared to those of an aircraft with minimum direct operating cost. The design variables considered in the optimisation problems include aircraft geometry, engine parameters, and cruise settings. An augmented Lagrangian particle swarm optimiser and a genetic algorithm are used to solve the single objective and multi-objective optimisation problems, respectively.

scholarly journals Some Aspects of Variable Geometry Gas Turbine Operation

1992 ◽  
Author(s):  
J. E. A. Roy-Aikins
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Variable Geometry ◽  
Engine Control ◽  
Thermodynamic Cycles ◽  
Design Performance ◽  
Performance Improvements ◽  
Geometry Engine ◽  
Mechanical Phenomena

Many gas turbine thermodynamic cycles have been proposed which were designed to meet the propulsion requirements of future advanced aircraft. A thoughtful consideration of such designs is warranted as engines operating on such cycles will give a significant improvement in off-design performance. Such performance improvements can be brought about chiefly by the extensive use of variable geometry components. With the advent of the variable area turbine, a greater flexibility will be obtained in engine control and, hence, in aircraft operation. This paper examines the performance of a variable geometry engine that is suitable for V/STOL aircraft operation, and it discusses how certain aerodynamic and mechanical phenomena associated with variable area turbines may influence the design and limit the operation of future advanced gas turbines.

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