Toward a high-fidelity helicopter rotor redesign framework

Kyle Collins, Jeremy Bain, Nischint Rajmohan, Lakshmi Sankar, T. Alan Egolf, Ram D. Janakiram, Kenneth Steven Brentner, Leonard Lopes

Research output: Contribution to journalConference article

6 Citations (Scopus)

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. Often the tools used are low fidelity tools with simplified aerodynamics. A problem with this is that these tools often lack a first principles based approach that is needed for new and novel designs, However, high fidelity, first principles based analysis tools have disadvantages related to complexity and run time. Though not as accurate, low fidelity tools are still physics based, have been proven useful in optimization, and have low analysis run time. The research presented uses first principles analysis and simplified physics based analysis together in a process to redesign a rotor blade's tip shape and twist. The design framework ModelCenter® is used to integrate the comprehensive rotorcraft analysis code RCAS with the aeroacoustics code PSU-WOPWOP into a low fidelity framework. A design of computer experiments is performed, 2nd order Response Surface Equations of objectives are built and subsequently used to examine four million stochastically generated design variable combinations in what is called Monte Carlo simulation. High fidelity tools are used to evaluate an optimum from this group. 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. In a effort to better select designs for future high fidelity analysis, additional low fidelity experiments are performed to improve the surrogate models. New surrogate models using 4th order Response Surface Equations are used to find optimums in each objective, These new optimum designs are checked in the low fidelity model and found to provide improved designs, but questions on global optimality still remain. Future work will focus on further automation of the high fidelity model and its use in the examination of these and other design configurations; moving closer toward a high-fidelity helicopter rotor redesign framework.

Original languageEnglish (US)
Pages (from-to)1270-1290
Number of pages21
JournalAnnual Forum Proceedings - AHS International
Volume2
StatePublished - Aug 28 2008
Event64th Annual Forum - AHS International - Montreal, Canada
Duration: Apr 29 2008May 1 2008

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Helicopter rotors
Rotors
Turbomachine blades
Physics
Aeroacoustics
Aerodynamics
Automation
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Collins, K., Bain, J., Rajmohan, N., Sankar, L., Egolf, T. A., Janakiram, R. D., ... Lopes, L. (2008). Toward a high-fidelity helicopter rotor redesign framework. Annual Forum Proceedings - AHS International, 2, 1270-1290.
Collins, Kyle ; Bain, Jeremy ; Rajmohan, Nischint ; Sankar, Lakshmi ; Egolf, T. Alan ; Janakiram, Ram D. ; Brentner, Kenneth Steven ; Lopes, Leonard. / Toward a high-fidelity helicopter rotor redesign framework. In: Annual Forum Proceedings - AHS International. 2008 ; Vol. 2. pp. 1270-1290.
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Collins, K, Bain, J, Rajmohan, N, Sankar, L, Egolf, TA, Janakiram, RD, Brentner, KS & Lopes, L 2008, 'Toward a high-fidelity helicopter rotor redesign framework', Annual Forum Proceedings - AHS International, vol. 2, pp. 1270-1290.

Toward a high-fidelity helicopter rotor redesign framework. / Collins, Kyle; Bain, Jeremy; Rajmohan, Nischint; Sankar, Lakshmi; Egolf, T. Alan; Janakiram, Ram D.; Brentner, Kenneth Steven; Lopes, Leonard.

In: Annual Forum Proceedings - AHS International, Vol. 2, 28.08.2008, p. 1270-1290.

Research output: Contribution to journalConference article

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AU - Lopes, Leonard

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Collins K, Bain J, Rajmohan N, Sankar L, Egolf TA, Janakiram RD et al. Toward a high-fidelity helicopter rotor redesign framework. Annual Forum Proceedings - AHS International. 2008 Aug 28;2:1270-1290.