Elastomeric Dampers Derived From First-Principles-Based Analytical Simulation

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX08CA59P
Agency Tracking Number: 075524
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Materials Technologies Corporation
57 Maryanne Drive, Monroe, CT, 06468
Duns: 180516577
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Serkan Ozbay
 Principal Investigator
 (203) 874-3100
 sozbay@aboutmtc.com
Business Contact
 Yogesh Mehrotra
Title: Business Official
Phone: (203) 874-3100
Email: YMehrotra@AboutMTC.com
Research Institution
N/A
Abstract
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.

* information listed above is at the time of submission.

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