Hybrid Finite Element Analysis for Rotorcraft Interior Noise Simulations

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$599,980.00
Award Year:
2010
Program:
SBIR
Phase:
Phase II
Contract:
NNX10CB35C
Award Id:
90809
Agency Tracking Number:
084833
Solicitation Year:
n/a
Solicitation Topic Code:
A2
Solicitation Number:
n/a
Small Business Information
2890 Carpenter Road, Suite 1900, Ann Arbor, MI, 48108
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
134722656
Principal Investigator:
GengZhang
Principal Investigator
(734) 477-5710
gengz@miengsrv.com
Business Contact:
NickVlahopoulos
Business Official
(734) 734-0792
nv@miengsrv.com
Research Institute:
n/a
Abstract
One of the main attributes contributing to the competitiveness of rotorcraft, is the continuously increasing expectations for passenger comfort which is directly related with reduced vibration levels and reduced interior noise levels. Such expectations are amplified in the VIP market where people are used in the acoustic and vibration levels of civil and executive jets. One of the most critical excitations for interior noise in helicopters is the one from the gearbox. Thus, the structure-borne noise path (i.e. excitation propagating from mounting locations through the fuselage structure to the panels of the cabin and to the interior) must be captured in rotorcraft interior noise computations. This proposal addresses the need stated in the solicitation for developing physics based tools that can be used within a multi-disciplinary design-analysis-optimization for computing interior noise in rotorcraft applications. Currently, there is no robust simulation capability for this type of acoustic simulations. The hybrid FEA method can be used for structure-borne helicopter applications and can be integrated very easily (due to the finite element based model) with models from other disciplines within a multidisciplinary design environment. It combines conventional FEA with Energy Finite Element (EFEA) and it extends the frequency range of applicability of an existing finite element model by converting the elements that model the flexible panels into EFEA type of elements. A seamless Hybrid FEA capability of commercial quality will be developed based on MES' commercial EFEA code. UTRC will participate in the proposed effort for validating the new developments through comparisons to test data for a rotorcraft structure and for providing technical consultancy.

* information listed above is at the time of submission.

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