Pareto frontier method for multi-disciplinary optimization of helicopter rotors

Kyle Collins, Jeremy Bain, Lakshmi Sankar, T. Alan Egolf, Ram D. Janakiram, Ken Brentner, Leonard Lopes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Limitations of rotorcraft generally fall into the categories of speed, noise, vibration, and range. Rotor blade design plays a large role in how these limitations may be mitigated. Designers are always looking for new ways to design more optimum rotor systems. In this work, a methodology is presented that uses both low and high fidelity analysis tools to pick and examine a redesign of the HART model rotor. The design framework Model Center® is used to integrate the comprehensive rotorcraft analysis code RCAS with the aeroacoustics code PSU-WOPWOP. This low fidelity model assumes rigid blades, prescribed wake aerodynamics, and compact blade loading for aeroacoustics. Design variables define tip geometry and twist distribution with power required and noise in both hover and forward flight considered as objectives to improve. A design of computer experiments is performed. Surrogate models of the objectives are built and subsequently used to examine four million stochastically generated design variable combinations in what is called Monte Carlo simulation. The simulation results are filtered to identify the Pareto optimal designs within the group. One of these designs is selected for examination using higher fidelity CFD based tools. The hover analysis is performed with TURNS while analysis of forward flight is done using an elastic blade RCAS model coupled with the efficient rotorcraft CFD code GT-HYBRID. Noise prediction is made by PSU-WOPWOP using blade surface pressures from TURNS and GT-HYBRID. The optimum is found to exhibit better performance characteristics and reduced noise. An a posteriori examination of vibratory characteristics reveals the optimum produces more vibration in forward flight than the baseline, highlighting the need to consider vibration in during the first phase using low fidelity tools.

Original languageEnglish (US)
Title of host publicationAmerican Helicopter Society International Specialists Conference on Aerodynamics 2008
Pages703-721
Number of pages19
StatePublished - 2008
EventAHS Specialists Conference on Aerodynamics 2008 - San Francisco, CA, United States
Duration: Jan 23 2008Jan 25 2008

Publication series

NameAHS Specialists Conference on Aerodynamics 2008
Volume2

Other

OtherAHS Specialists Conference on Aerodynamics 2008
CountryUnited States
CitySan Francisco, CA
Period1/23/081/25/08

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Civil and Structural Engineering

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  • Cite this

    Collins, K., Bain, J., Sankar, L., Egolf, T. A., Janakiram, R. D., Brentner, K., & Lopes, L. (2008). Pareto frontier method for multi-disciplinary optimization of helicopter rotors. In American Helicopter Society International Specialists Conference on Aerodynamics 2008 (pp. 703-721). (AHS Specialists Conference on Aerodynamics 2008; Vol. 2).