NASA SBIR 2007 Solicitation

FORM B - PROPOSAL SUMMARY


PROPOSAL NUMBER: 07-1 A2.10-8476
SUBTOPIC TITLE: Rotorcraft
PROPOSAL TITLE: Elastomeric Dampers Derived From First-Principles-Based Analytical Simulation

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Materials Technologies Corporation
57 Maryanne Drive
Monroe, CT 06468 - 3209
(203) 874-3100

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Serkan Ozbay
sozbay@aboutmtc.com
57 Maryanne Drive
Monroe, CT 06468 - 3209
(203) 874-3100

Expected Technology Readiness Level (TRL) upon completion of contract: 5 to 6

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
The lead-lag motions of rotor blades in a helicopter require damping to stabilize them. In practice, this has necessitated the use of external hydraulic dampers which suffer from a high maintenance cost. This high operational cost has prompted the rotorcraft industry to use elastomeric lead-lag dampers that result in ``dry'' rotors. However, complex behavior of elastomers provides challenges for the modeling of such devices, as has been noted by rotorcraft airframers. Analytical models have tended to oversimplify the complexity of the operational environment and make radical assumptions about operating parameters that, at best, lead to simple, and often unreal, device models. In spite of costly and time consuming experiments to construct them, these first order device models do not directly relate to neither material characteristics nor geometric configuration. Example: the device model approach leads to the erroneous identification of "physical phenomena" such as dual frequency effect.
We propose a fundamentally radical approach wherein elastomeric dampers are derived from first-principle-based modeling rather than device model based analysis. First we propose to develop a finite element based simulation tool for modeling the response of complex components made of elastomeric materials. When integrated with a finite element based, multibody dynamics analysis code, this innovative tool will accurately simulate the dynamic response of vehicles such as rotorcraft using elastomeric components using true material properties and damper geometry. This tool will be unique because it will capture both dissipative and geometric nonlinearities causing damping loss at dual frequency excitations typically observed in elastomeric devices. When fully developed and validated, our first principles based formulation for the modeling of elastomeric devices will be available for robust component design.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
Elastomers are used in many vehicles for applications from vibration isolation to stability augmentation. For NASA, the immediate application would be in integration of the process into a robust rotorcraft design environment. Moreover, the generic nature of the formulation would make it amenable to modeling any electrometric material application

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
First, Commercial rotorcraft industry - provide considerable cost reductions in the design process.
Secondly since any device based on elastomers can be modeled. Final product would find quite large range of application in the automotive as well as tracked vehicle industry.

NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.

TECHNOLOGY TAXONOMY MAPPING
Airframe
Composites
Computational Materials
Controls-Structures Interaction (CSI)
Kinematic-Deployable
Launch and Flight Vehicle
Operations Concepts and Requirements
Simulation Modeling Environment
Spaceport Infrastructure and Safety
Structural Modeling and Tools


Form Generated on 09-18-07 17:50