Coupling Adaptive-Fidelity CFD With S&amp;C Analysis to Predict Flying Qualities

Goetzendorf‐Grabowski, Tomasz; Rizzi, Arthur; Molitor, Paul; Vos, Jan B.; Sanchi, Stéphane; Tomac, Maximillian

doi:10.2514/6.2009-3630

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…The Simulation and Dynamic Stability Analyzer (SDSA) code [12] is used in this paper. For the assessment of handling qualities, SDSA linearizes the rigid-aircraft equations of motion in the matrix form around the equilibrium (trim) point.…”

Section: Flight Handling Quality Calculationmentioning

confidence: 99%

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Ghoreyshi

Badcock

Ronch

et al. 2011

Math. Model. Nat. Phenom.

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Abstract. Physics based simulation is widely seen as a way of increasing the information about aircraft designs earlier in their definition, thus helping with the avoidance of unanticipated problems as the design is refined. This paper reports on an effort to assess the automated use of computational fluid dynamics level aerodynamics for the development of tables for flight dynamics analysis at the conceptual stage. These tables are then used to calculate handling qualities measures. The methodological questions addressed are a)geometry and mesh treatment for automated analysis from a high level conceptual aircraft description and b) sampling and data fusion to allow the timely calculation of large data tables. The test case used to illustrate the approaches is based on a refined design passenger jet wind tunnel model. This model is reduced to a conceptual description, and the ability of this geometry to allow calculations relevant to the final design to be drawn is then examined. Data tables are then generated and handling qualities calculated.

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Section: Flight Handling Quality Calculationmentioning

confidence: 99%

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Ghoreyshi

Badcock

Ronch

et al. 2011

Math. Model. Nat. Phenom.

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“…The key problem in this type of issue is the quality of the data, and in particular the fidelity of the aerodynamic characteristics. This problem has been raised in a number of works that examined the impact of aerodynamic data fidelity on the results of dynamic stability analyses [8,9] or the quality of simulations [10,11].…”

Section: Introductionmentioning

confidence: 99%

Study of the Impact of Aerodynamic Model Fidelity on the Flight Characteristics of Unconventional Aircraft

Goetzendorf-Grabowski,

Kwiek

2023

Applied Sciences

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The article presents a study on the influence of aerodynamic model fidelity on dynamic characteristics. The Simulation and Dynamic Stability Analysis (SDSA) package was used to calculate the dynamic characteristics, using both eigenvalues (linearized model) and a time history approach (nonlinear model). The tests were carried out for a rocket aircraft designed in a tailless configuration with a leading edge extension and rotating side plates. Due to these features, the rocket plane can be classified as an unconventional configuration, which requires special attention. Aerodynamic characteristics of the rocket plane were measured in a subsonic wind tunnel and calculated using Euler model equations-based software (MGAERO) and low-order potential-flow code (PANUKL). The paper presents the results of dynamic analysis in the form of standard modes of motion characteristics. A comparison of dynamic characteristics calculated using a set of aerodynamic data with different fidelity is shown and discussed. Both longitudinal and lateral cases were included. The presented results show that the potential methods, considered old-fashioned and despite many simplifications, are still an attractive tool and can be used to analyze even complex, unconventional configurations.

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“…Many university textbooks (Napolitano, 2012;Roskam, 1955;Etkin and Reid, 1996;Pamadi, 1998) present various schemes for such an assessment. Moreover, some referred journal papers recently published Rizzi et al, 2011) and various proceeding of some prestigious conferences (Von Kaenel et al, 2008;Goetzendorf-Grabowski et al, 2009;Rizzi et al, 2009;Goetzendorf-Grabowski and Figat, 2012) describe procedures and application of specialised software Rizzi et al, 2009), which could be used for stability analysis during the very early stage of design of an aircraft to assess stability and improve it if necessary. It would be impossible to list in this paper even the most important articles and proceedings dealing with aircraft stability analysis and the latest advances in this field.…”

Section: Introductionmentioning

confidence: 99%

Flight dynamics models used in different national and international projects

Goraj

2014

Aircraft Eng & Aerospace Tech

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Purpose – The present study aimed to demonstrate different computational models, data and stability results obtained in a wide number of projects of various aircrafts such as unmanned aerial vehicles (UAVs), general aviation and big passenger flying airliners in blended wing body (BWB) configurations. Many details of modeling and computing are shown for unconventional configurations, namely, for a BWB aircraft and for tailless UAVs. Design/methodology/approach – Mathematical models for analysis of static and dynamic stability were built and investigated based on equations of motion in the linearized form using the so-called state variable model for a steady-state disturbed, generally asymmetric, flight. Findings – Flight dynamics models and associated computational procedures appeared to be useful, both in a preliminary design phase and during the final assessment of the configuration at flight tests. It was also found that the difference between thresholds for static and dynamic stability conditions was equal to 9 per cent of mean aerodynamic chord (MAC) in the case of BWB and 3 per cent of MAC in the case of tailless UAVs. Practical implications – Many useful information about aircraft dynamics can be easily obtained from computational analyses including time to half/double and periods of oscillation, undamped frequencies, damping ratio and many others. Stability analysis of different unconventional configurations will be easier and faster if an access to such configurations is available. Originality/value – This paper presents a very efficient method of assessment of the designing parameters, especially in an early stage of the design process. In open literature, there are a great number of datasets for classical configurations, but it is hard to find anything for passenger BWB and tailless UAVs. Stability computations are performed based on equations of motion derived in the stability frame of the reference fixed with one-quarter of MAC. It can be considered as an original, not typical but a very practical approach because values of stability and control derivatives do not change even if the centre of gravity is travelling.

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Coupling Adaptive-Fidelity CFD With S&C Analysis to Predict Flying Qualities

Cited by 8 publications

References 5 publications

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Study of the Impact of Aerodynamic Model Fidelity on the Flight Characteristics of Unconventional Aircraft

Flight dynamics models used in different national and international projects

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