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A multidisciplinary process for integrated rotorcraft design

  • Peter WeiandEmail author
  • Dominik Schwinn
  • Matthias Schmid
  • Michel Buchwald
Original Paper

Abstract

This paper presents a new integrated design process for rotorcraft developed by German Aerospace Center (DLR). The fundamental features of this process are distributed computation on the servers of the different institutes, analysis tools with increasing physical fidelity along the progress of the design process and a high modularity inside the software framework. A reliable data exchange between the tools is provided by an extended version of DLRs Common Parametric Aircraft Configuration Schema. The tools cover the phases of conceptual and largely preliminary design. The design process is initialized by a statistical concept study, providing the first configuration for the following sizing and optimization task. The methods of the tools applied range from blade element theory over vortex panel theory, to finite element methods for structural sizing. The high modularity allows an easy integration of new abilities into the toolbox. The process and design environment presented here are the results of two DLR internal projects carried out by the Institute of Flight Systems, the Institute of Aerodynamics and Flow Technology and the Institute of Structures and Design.

Keywords

Rotorcraft Flight performance Integrated design 

List of symbols

\({\text{a}}\)

Speed of sound (m/s)

\(C_{\text{T}}\)

Thrust coefficient (–)

\(C_{{{\text{l}}\alpha }}\)

Lift curve slope (–)

\(c_{\text{MR}}\)

Main rotor blade chord length (m)

\(E_{\text{rot}}\)

Rotational energy (J)

\(E_{\text{trans}}\)

Translational energy (J)

\({\text{g}}\)

Gravitational acceleration (m/s2)

\(J_{\beta }\)

Blade flap moment of inertia (kg m2)

\(J_{\zeta }\)

Blade lag moment of inertia (kg m2)

\(l_{\text{fus}}\)

Fuselage length (m)

\(m_{\text{BEM}}\)

Basic empty mass (kg)

\(m_{\text{F}}\)

Fuel mass (kg)

\(m_{\text{MTOM}}\)

Maximum take-off mass (kg)

\(m_{\text{OEM}}\)

Operating empty mass (kg)

\(m_{\text{OM}}\)

Operators mass (kg)

\(m_{\text{P}}\)

Payload mass (kg)

\(m_{\text{bl}}\)

Mass of rotor blade (kg)

\(m_{\text{fus}}\)

fuselage structural mass (kg)

\(m_{\text{propu}}\)

Propulsion mass inclusive drivetrain (kg)

\(m_{\text{struc}}\)

Structural mass (kg)

\(m_{\text{syst}}\)

Systems mass (kg)

\(Ma_{\text{tip,MR}}\)

Main rotor tip Mach number (–)

\(N_{\text{bl,MR}}\)

Number of blades per main rotor (–)

\(N_{{{\text{rot}},{\text{MR}}}}\)

Number of main rotors (–)

\(P_{\text{ind}}\)

Induced power (W)

\(P_{\text{inst}}\)

Maximum installed power (W)

\(R_{\text{MR}}\)

Main rotor blade radius (m)

\(s_{\text{RNG}}\)

Flight range (m)

\(s_{\text{shaft}}\)

Rotor shaft spacing (m)

\(T_{\text{MR}}\)

Main rotor thrust force (N)

\(v_{\text{h}}\)

Horizontal flight speed (m/s)

\(v_{{{\text{tip}},{\text{MR}}}}\)

Main rotor tip speed (m/s)

\(\gamma_{\text{MR}}\)

Main rotor Lock number (–)

\(\kappa_{\text{ov}}\)

Overlapping factor (–)

\(\kappa_{\text{cutout}}\)

Cut-out ratio of the rotor blade (–)

\(\mu\)

Advance ratio (–)

\(\varLambda_{\text{MR}}\)

Main rotor blade aspect ratio (–)

\(\rho\)

Air density (kg/m3)

\(\sigma_{\text{MR}}\)

Rotor density of main rotor (–)

\(\sigma_{\text{ov}}\)

Rotor overlap fraction (–)

\(\varOmega_{\text{MR}}\)

Main rotor rotational speed (rad/s)

Abbreviations

AFDD

US Army aeroflightdynamics directorate

BEM

Basic empty mass

CPACS

Common parametric aircraft configuration schema

DLR

German aerospace center (Deutsches Zentrum für Luft-und Raumfahrt)

EDEN

Evaluation and design of novel rotorcraft concepts

FEM

Finite element method

FSD

Fully stressed design

HOST

Helicopter overall simulation tool

MDO

Multidisciplinary design and optimization

MTOM

Maximum take-off mass

OEM

Operating empty mass

RCE

Remote component environment

RIDE

Rotorcraft integrated design and evaluation

TLAR

Top level aircraft requirement

Notes

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Copyright information

© Deutsches Zentrum für Luft- und Raumfahrt e.V. 2019

Authors and Affiliations

  1. 1.German Aerospace Center, DLRInstitute of Flight SystemsBrunswickGermany
  2. 2.German Aerospace Center, DLRInstitute of Structures and DesignStuttgartGermany
  3. 3.German Aerospace Center, DLRInstitute of Aerodynamics and Flow TechnologyBrunswickGermany

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