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31st May 2018, West Jordan, UT

Seoul National University leverages VABS software

AnalySwift, a provider of high-fidelity modelling software for composites and other advanced materials, has announced that Seoul National University is leveraging its VABS software to accelerate and optimise design of composite helicopter rotor blades and high aspect ratio wings.

Seoul National University has used VABS for a variety of structural optimisation projects in its Active Aeroelasticity and Rotorcraft Laboratory (AARL), which is part of the Department of Aerospace Engineering.

Example of VABS for designing and analysing a composite blade with a trailing-edge flap installed on Korea Aerospace Research Institute hingeless hub, by Ph D Eun, alumni of AARL. © AnalySwift

“We have worked with the Active Aeroelasticity and Rotorcraft Laboratory at Seoul National University for several years and we are pleased they selected VABS to be part of their toolset for simulation of composite rotor blades and other slender structures,” said Allan Wood, president and CEO of AnalySwift. “The AARL is involved in a variety of exciting research areas for which VABS can accelerate design by delivering accurate and efficient results.”

Reducing analysis time

The AARL investigates aeroelastic phenomena occurring in aircrafts and spacecrafts, under the direction of Prof SangJoon Shin. Specifically, aeroelasticity examines interactions among the inertial, aerodynamic, and elastic forces on the aerospace vehicles, which generate large deflections of the structures that may lead to destructive failures. Thus, precise prediction of the aeroelastic behaviours is required to prevent failure of the aerospace vehicles.

“The VABS program is a uniquely powerful tool for modelling composite blades and other slender structures, commonly called beams,” said Dr Wenbin Yu, CTO of AnalySwift. “VABS reduces analysis time from hours to seconds by quickly and easily achieving the accuracy of detailed 3D FEA with the efficiency of simple engineering models.”

Optimisation of the cross-sectional configuration of helicopter rotor blade. © AnalySwift

“With VABS, engineers can calculate the most accurate, complete set of sectional properties, such as torsional stiffness, shear stiffness, shear centre for composite beams made with arbitrary cross-section and arbitrary material. It can also predict accurate detailed stress distribution for composite beams, which are usually not possible with 3D FEA for realistic composite structures.”

Current projects

Comprehensive analyses for rotorcrafts and high aspect-ratio wings are performed at AARL using commercial, open source, and in-house codes for the geometrically exact beam theory where the one-dimensional beam and two-dimensional cross-sectional properties are used. Therefore, structural optimisation programs using VABS are frequently developed and used.

𝛄𝟏𝟐 strain recovery analysis result of a pipe-type main spar of a human-powered aircraft by Kang, graduate student of AARL. © AnalySwift

Thanks to the powerful pre-post processing utility PreVABS, global optimisation framework using scripts written in other tools is easily constructed. Two current projects being designed, in part, using VABS include an active helicopter rotor blade equipped with a trailing-edge flap, as well as a slender wing for human-powered aircraft.

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