2008
DOI: 10.4050/jahs.53.179
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Soft-Inplane Tiltrotor Aeromechanics Investigation Using Two Comprehensive Multibody Solvers

Abstract: This paper focuses on the development of multibody numerical models to predict the dynamic response, aeroelastic stability, and blade loading of a soft-inplane tiltrotor wind-tunnel model. Comprehensive rotorcraft-based multibody analyses enable modeling of the rotor system to a high level of detail such that complex mechanics and nonlinear effects associated with control system geometry, and joint deadband may be considered. The influence of these and other nonlinear effects on the aeromechanical behavior of … Show more

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Cited by 21 publications
(18 citation statements)
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“…The aeroservoelastic model of the WRATS model implemented in MBDyn [2] evolved over the years in support of wind-tunnel testing at NASA LaRC (soft-inplane [18,19], stiff-inplane [20,21]). Figure 2 shows a sketch of the WRATS multibody model.…”
Section: Comprehensive Aeroservoelastic Modelmentioning
confidence: 99%
“…The aeroservoelastic model of the WRATS model implemented in MBDyn [2] evolved over the years in support of wind-tunnel testing at NASA LaRC (soft-inplane [18,19], stiff-inplane [20,21]). Figure 2 shows a sketch of the WRATS multibody model.…”
Section: Comprehensive Aeroservoelastic Modelmentioning
confidence: 99%
“…To accurately model a sophisticated tiltrotor system, comprehensive rotorcraft analysis codes and multibody dynamics codes have been used to understand fundamental mechanisms and correlate with available test data (Refs. [17][18][19][20][21][22]. The validation of analytical methods has met with only limited success.…”
Section: Introductionmentioning
confidence: 99%
“…The failure of comprehensive rotorcraft analysis and multibody dynamics codes to consistently match each other's predictions for the WRATS (Wing and Rotor Aeroelastic Test System) model (Refs. [17][18][19][20][21][22] is a major incentive for the current effort. The WRATS is a 1/5-scale semispan aeroelastic model of the Joint Services Advanced Vertical Lift Aircraft (JVX), which evolved into the V-22 tiltrotor.…”
Section: Introductionmentioning
confidence: 99%
“…Reasons can be the influence of the drive train on the model, either by changing the overall stiffness properties or by the introduction of non-linearities (e.g. free-play and backlash), as described by Nixon et al 11 as well as by Masarati et al 12 for the so-called WRATS tiltrotor test rig. Another difference between windmilling and thrust mode is the deformation of an elastic blade under thrust, resulting also in different trim conditions, as indicated by Mattaboni et al 13 Finally, the thrust vector is a so-called follower force leading to a non-conservative equation of motion resulting from the angular displacement of the rotor plane with respect to the wing.…”
Section: Introduction: Whirl Flutter For Tiltrotor Aircraft Backgroundmentioning
confidence: 99%