Modal approach in the fluid-structure interaction in aerospace

Chajec, Wojciech; Dziubiński, Adam

doi:10.1201/b20057-26

Cited by 2 publications

(2 citation statements)

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“…Aeroelastic analyses are usually performed in frequency domain, but there are examples of performing them in the time domain with more accurate nonlinear aerodynamic models, like Tau-code (Roszak et al, 2011) or ANSYS Fluent (Chajec and Dziubi nski, 2016b).…”

Section: Generalized Masses Determinationmentioning

confidence: 99%

Comparison of flutter calculation methods based on ground vibration test result

Chajec

2019

AEAT

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PurposeA low-cost but credible method of low-subsonic flutter analysis based on ground vibration test (GVT) results is presented. The purpose of this paper is a comparison of two methods of immediate flutter problem solution: JG2 – low cost software based on the strip theory in aerodynamics (STA) and V-g method of the flutter problem solution and ZAERO I commercial software with doublet lattice method (DLM) aerodynamic model and G method of the flutter problem solution. In both cases, the same sets of measured normal modes are used. Design/methodology/approachBefore flutter computation, resonant modes are supplied by some non-measurable but existing modes and processed using the author’s own procedure. For flutter computation, the modes are normalized using the aircraft mass model. The measured mode orthogonalization is possible. The flutter calculation made by means of both methods are performed for the MP-02 Czajka UL aircraft and the Virus SW 121 aircraft of LSA category. FindingsIn most cases, both compared flutter computation results are similar, especially in the case of high aspect wing flutter. The Czajka T-tail flutter analysis using JG2 software is more conservative than the one made by ZAERO, especially in the case of rudder flutter. The differences can be reduced if the proposed rudder effectiveness coefficients are introduced. Practical implicationsThe low-cost methods are attractive for flutter analysis of UL and light aircraft. The paper presents the scope of the low-cost JG2 method and its limitations. Originality/valueIn comparison with other works, the measured generalized masses are not used. Additionally, the rudder effectiveness reduction was implemented into the STA. However, Niedbal (1997) introduced corrections of control surface hinge moments, but the present work contains results in comparison with the outcome obtained by means of the more credible software.

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Section: Generalized Masses Determinationmentioning

confidence: 99%

Comparison of flutter calculation methods based on ground vibration test result

Chajec

2019

AEAT

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“…After the static testing, ground vibration tests of the complete motorglider were conducted in the Warsaw Institute of Aviation. The results were used to analyse aeroelastic characteristics (Chajec and Dziubiń ski, 2015), such as flatter mode shapes of the airframe and to calculate critical flatter speeds (Figure 14).…”

Section: Ground Testsmentioning

confidence: 99%

The electric-powered motorglider AOS-71 – the study of development

Marjanowski

Tomasiewicz

Frączek

2017

AEAT

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Purpose The purpose of this paper is to present the process of design and prototyping of a two-seat, electric-powered, self-launching motorglider AOS-71 closely connected with the teaching process conducted by the academic staff of Warsaw University of Technology (WUT) within a unique educational ULS – Ultra Light Sailplanes programme. Design/methodology/approach The selected design methods and tools used during the development of the motorglider have been described. The computer aided design/computer aided manufacturing modules of the Siemens NX software were used to work on the structural design, tools and technical documentation. The core of the ULS educational programme is to educate aerospace engineering students by providing an opportunity for them to participate in each phase of the aircraft life cycle – from conceptual drawings through structural design and prototyping to manufacturing, testing and maintenance. Findings The main innovations of the AOS-71 design are: retractable ecological electric propulsion, spacious cockpit where seats are located side by side and the all-composite airframe made of 90 per cent advanced carbon epoxy composites. Practical implications The electric motorglider can be used as a multifunctional flying laboratory for flight research and student education. Originality/value The AOS-71 project and its continuation are a valuable example of involving aerospace students in each phase of the aircraft life cycle. It also contributes to the research in the field of using innovative electrical propulsion systems in aircraft designs.

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Modal approach in the fluid-structure interaction in aerospace

Cited by 2 publications

References 0 publications

Comparison of flutter calculation methods based on ground vibration test result

Comparison of flutter calculation methods based on ground vibration test result

The electric-powered motorglider AOS-71 – the study of development

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