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Automatic Differentiation in Multibody Helicopter Simulation

Kontak, Max (2019) Automatic Differentiation in Multibody Helicopter Simulation. Seminar von DLR-SC mit Fraunhofer SCAI und der Hochschule Bonn-Rhein-Sieg, 29. Nov. 2019, Köln, Deutschland. (Unpublished)

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Abstract

In a first approximation, helicopters can be modeled by open-loop multibody systems (MBS). For this type of MBS the joints' degrees of freedom provide a globally valid set of minimal states. We derive the equations of motion in these minimal coordinates and observe that one has to compute Jacobian matrices of the bodies' kinematics with respect to the minimal states. Classically, these Jacobians are derived analytically from a complicated composition of coordinate transformations. In this paper, we will present an alternative approach, where the arising Jacobians are computed by automatic differentiation (AD). This makes the implementation of a simulation code for open-loop MBS more efficient, less error-prone, and easier to extend. We also provide ideas, how to include flexible bodies and closed-loop parts in the MBS. To emphasize the applicability of our approach, we provide simulation results for rigid MBS helicopter models.

Item URL in elib:https://elib.dlr.de/131983/
Document Type:Conference or Workshop Item (Speech)
Title:Automatic Differentiation in Multibody Helicopter Simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kontak, MaxMax.Kontak (at) DLR.dehttps://orcid.org/0000-0003-3738-7483
Date:29 November 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:multibody systems, automatic differentiation, helicopter simulation
Event Title:Seminar von DLR-SC mit Fraunhofer SCAI und der Hochschule Bonn-Rhein-Sieg
Event Location:Köln, Deutschland
Event Type:Workshop
Event Dates:29. Nov. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben SISTEC, L - VicToria
Location: Köln-Porz
Institutes and Institutions:Institut of Simulation and Software Technology > High Performance Computing
Institut of Simulation and Software Technology
Deposited By: Kontak, Max
Deposited On:04 Dec 2019 10:05
Last Modified:04 Dec 2019 10:05

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