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BNET Business Dictionary
- Productivity
- a measurement of the efficiency of production, taking the form of a ratio of the output of goods and services to the input of factors...
- Productivity definition on BNET »
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- Recent Developments in Computer Modeling, Material Characterization and Experimental Validation With Respect to Crash Dynamics
- The presented paper's goal is to give a brief overview of recent numerical and experimental developments performed for ten years by the ONERA/DMSE/RCS, aiming at improving structures conception with respect to crashworthiness, ditching, impact or explosion hardening considerations. One of ONERA Research goals is to improve the material characteristics and,...
- White papers 2004-12-07
- Modeling of the Ignition Inside a Turbojet Combustor: Application to In-Flight Relight
- In the paper, the numerical model is presented in detail, and some examples of its application to the experimental configuration are discussed. At high altitude, the operating critical conditions make the ignition and the relighting of jet engine combustors more difficult to control. The objective of ONERA is to develop...
- White papers 2004-10-04
- Numerical Simulations Around Wing Control Surfaces
- In this paper a study of wing control surface effectiveness was carried out using numerical simulations with the advanced Reynolds Averaged Navier-Stokes solver elsA. Non-coincident meshing techniques were used as to make t he mesh generation process more flexible. The first application attempts to predict an aileron effectiveness using the...
- White papers 2004-09-30
- Rear Infrared Thermography in Heat Fluxes Determination on Hypersonics Vehicles
- Due to aggressive external conditions during a hypersonic flight, parameters such as external wall temperature are not easily measurable with the usual approach. Hence this study develops a promising in flight measurements methodology to estimate heat fluxes on space vehicle external surface, in order to improve the aerodynamic models. One...
- White papers 2004-09-15
- Heat Flux Determination on Hypersonics Vehicles With an Inverse Method: First Validation Step
- The aim of this paper is to determine the heat fluxes received on the space vehicle wall starting from the temporal evolution of its internal face thermal map. This technique is non intrusive and measurement zones are not directly exposed to the external aggressive conditions. The ground validation phase of...
- White papers 2004-09-17
- Parallel Chimera Computations of Helicopter Flows
- In the CFD field, chimera method is a meshing technique that enables to deal with complex geometries using overset structured grids. In the context of parallel scalar computers, its efficiency can be raised by balancing the overset grid blocks over the machine processors. In this paper, the chimera method has...
- White papers 2004-09-09
- On the Refinement of Discretization for Optimal Control Problems
- In the frame of future launcher design studies, this paper gives possible improvements of tools and methods for trajectory optimization. Trajectory optimization of reusable launch vehicle RLV is a very complex task calling for a versatile tool, which should be able to address - either simultaneously or separately - ascent...
- White papers 2004-06-24
- Non-Intrusive Measurement Techniques Applied to the Hybrid Motor Solid Fuel Degradation
- The knowledge of the solid fuel regression rate and the time evolution of the grain geometry are requested for hybrid motor design and control of its operating conditions. Two non-intrusive techniques have been applied to hybrid propulsion: both are based on wave propagation, the X-rays and the ultrasounds, through the...
- White papers 2004-06-15
- Modal Expansion Functions Combined With EFIE Applied to Air Intake / Engine RCS Computations
- This paper introduces a sub-domains technique for analyzing the EM scattering from 3D cavities. The Electric Field Integral Equation is used to compute the generalized Scattering matrices of the sub-domains. Wave-guided modes are used for modeling the field propagation from the cavity opening down to the engine face. RCS patterns...
- White papers 2004-05-25
- Laminarity and Laminar-Turbulent Transition Control
- The paper provides an overview of the tools which are currently available for delaying the onset of transition. Distinction is made between techniques which modify the mean flow field and techniques acting on the unstable wave's birth and development, without any action on the mean flow field. Applications of the...
- White papers 2004-05-04
- Distributed Simulation for Acquisition and Analysis of Future Airport Operational Concept
- In this paper, the French Aeronautics and Space Research Center ONERA are carrying out a federative R&D project to propose solutions which enhance traffic management of future airports while maintaining safety. One goal of this initiative is to provide an open and scalable modeling and simulation infrastructure to evaluate several...
- White papers 2004-03-22
- Evaluation of an Enhanced Semi-Passive Technique for the Reduction of Structural Noise and Vibrations
- For the reduction of structural noise and vibrations, passive techniques are widely used, and active control has now been widely studied in this paper. At the meeting of both approaches, semi-passive techniques have seemed to be too limited, until recently and a new technique: Synchronized Switch Damping on Inductance SSDI....
- White papers 2004-03-17
- Singularity and Elliptical Mesh Deformation Techniques
- This paper describes and provides information about two mesh deformation techniques. The first one is based on an analogy with the well known singularity or panel methods, a 2-D and 3-D examples are presented. The second one consists in minimizing an energy-like function in order to preserve or improve the...
- White papers 2004-03-08
- An Overview of Applied Aerodynamics Research at ONERA
- This paper presents a review of recent researches conducted at ONERA in the field of Applied Aerodynamics. The different computation methods and experimental facilities are first recalled. A status is then made on the capabilities of the CFD tools for 3D flow prediction. A particular attention is put on the...
- White papers 2004-01-08
- Research Ramjet Program: An Initiative to Improve Knowledge on Ramjet Reactive Flowfields
- A research ramjet program has been initiated at ONERA with the support of DGA/SPNuc in 1995 with the aim to improve methodology for ramjet combustion chamber design and tuning by using validated CFD codes. The approach used was to design and manufacture a specific ramjet model in order to setup...
- White papers 2004-01-11
Additional Resources
- Storm warning: the Dassault Rafale is poised to become Europe's premier fighter-bomber.(Cover Story)
- France's Rafale is the most capable aircraft of the three new-generation fighters developed in Europe over the last two decades. Although the Dassault Rafale, Eurofighter Typhoon, and Saab Gripen are all currently being developed as multirole aircraft, only in the case of the...
- Articles 2005-06-01
- The best of bob lape.(Dining/Restaurant Review)(Product/Service Evaluation)
- Onera * * 1/2 222 W. 79th St. between Amsterdam Avenue and Broadway, Manhattan. (212) 873-0200. A fascinating, innovative modern American restaurant inspired by Greek ingredients and flavors. Owner/chef Michael Psilakis prepares exciting small-plate raw mezes and many tasty turnings of tradition on...
- Articles 2004-12-20
- France pursues optical stealth program.(EUROPEAN REPORT)(Brief Article)
- On November 7, France's military-procurement agency awarded a $27-million contract to EADS for the design, production, and operation of the Moyen Aeroporte de Mesures Optroniques MAMO airborne test platform airborne optronic measurement facility. The main purpose of the program is to conduct exact...
- Articles 2004-01-01
- FRINGE THEATRE The Erpingham Camp Assembly Rooms Music Hall Until
- ROLY-POLY gag-merchant Johnny Vegas is no stranger to the festival experience, but this year he's playing things reasonably straight by trying his hand at treading the necessarily reinforced boards. In this new production of Joe Orton's rarely-performed holiday camp satire, Vegas makes a decent fist of the role of Chief...
- Articles 2000-08-13
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