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Investigation of Load Alleviation in Aircraft Pre-Design and Its Influence on Structural Mass and Fatigue

Handojo, Vega (2022) Investigation of Load Alleviation in Aircraft Pre-Design and Its Influence on Structural Mass and Fatigue. Aerospace Science and Technology (122). Elsevier. doi: 10.1016/j.ast.2022.107405. ISSN 1270-9638.

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Official URL: https://www.sciencedirect.com/science/article/pii/S1270963822000797?via%3Dihub


This work elaborates an aircraft pre-design process that integrates loads analysis, load alleviation, structural optimization and fatigue analysis. The consideration of maneuver and gust load alleviation in early design stages is a promising concept to reduce wing bending moments, structural mass and extend the fatigue life, as shown on two mid-range configurations: one with a backward and another one with a forward swept wing respectively. In the loads analysis, quasi-steady maneuvers and dynamic 1-cos gusts are considered. For the load alleviation, the ailerons are deflected symmetrically. While the maneuver load alleviation reacts to the commanded load factor, the gust load alleviation reacts to fluctuations in the angle of attack. With the selected loads from the simulations, the structure of the wing and horizontal tailplane (HTP) is optimized toward mass minimization. The constraints considered are material strength, buckling stability and static aeroelastic requirements. The steps comprising loads analysis and structure optimization are conducted iteratively until the wing box mass converges. The load alleviation yields a reduction of wing box mass by 2.8% on the backward and 6.1% on the forward swept wing configuration. A subsequent, qualitative fatigue analysis is carried out to compare the fatigue behaviors of the active and passive aircraft (with and without load alleviation). For the reference missions, loads due to continuous turbulence and ground-air-ground cycles are considered, and the fatigue life of the active aircraft is improved by 28% and 12% respectively, on top of the mass benefit. As a conclusion, the proposed process can serve to gain an insight into the benefits of load alleviation for a given aircraft in the pre-design phase, before it advances to the next design stage.

Item URL in elib:https://elib.dlr.de/144469/
Document Type:Article
Title:Investigation of Load Alleviation in Aircraft Pre-Design and Its Influence on Structural Mass and Fatigue
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Handojo, Vegavega.handojo (at) dlr.dehttps://orcid.org/0000-0001-6030-2383
Date:March 2022
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:load alleviation, loads analysis, structural optimization, fatigue analysis, aircraft pre-design
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Aircraft Technologies and Integration
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Handojo, Vega
Deposited On:26 Nov 2021 11:25
Last Modified:26 Aug 2022 10:09

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