Design, fabrication, and testing of SMA-enabled adaptive chevrons for jet noise reduction

Turner, Travis L.; Buehrle, Ralph D.; Cano, Roberto J.; Fleming, Gary A.

doi:10.1117/12.540013

Cited by 19 publications

(21 citation statements)

References 10 publications

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“…Previous work by the present authors demonstrated the feasibility of the active SMAHC chevron concept [23][24][25] . That work also provided the first shape control experimental validation for a recently commercialized (MSC.Nastran and ABAQUS) constitutive model for SMAHC materials and structures [25][26][27][28] .…”

Section: Introductionmentioning

confidence: 95%

“…Previous work at NASA LaRC presented a fabrication approach, test results, and validation of a numerical model for a SMAHC chevron concept with a single embedded actuator assembly 23,25 . It was found that the single actuator assembly provided insufficient actuation authority and limitations of the fabrication approach dictated development of a new procedure for embedding multiple actuators.…”

Section: Smahc Chevron Fabricationmentioning

confidence: 99%

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Design, fabrication, and testing of a SMA hybrid composite jet engine chevron

et al. 2006

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Control of jet noise continues to be an important research topic. Exhaust nozzle chevrons have been shown to reduce jet noise, but parametric effects are not well understood. Additionally, thrust loss due to chevrons at cruise suggests significant benefit from deployable chevrons. The focus of this study is development of an active chevron concept for the primary purpose of parametric studies for jet noise reduction in the laboratory and technology development to leverage for full scale systems. The active chevron concept employed in this work consists of a laminated composite structure with embedded shape memory alloy (SMA) actuators, termed a SMA hybrid composite (SMAHC). The actuators are embedded on one side of the middle surface such that thermal excitation generates a moment and deflects the structure. A brief description of the chevron design is given followed by details of the fabrication approach. Results from bench top tests are presented and correlated with numerical predictions from a model for such structures that was recently implemented in MSC.Nastran and ABAQUS. Excellent performance and agreement with predictions is demonstrated. Results from tests in a representative flow environment are also presented. Excellent performance is again achieved for both open-and closed-loop tests, the latter demonstrating control to a specified immersion into the flow. The actuation authority and immersion performance is shown to be relatively insensitive to nozzle pressure ratio (NPR). Very repeatable immersion control with modest power requirements is demonstrated.

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Section: Introductionmentioning

confidence: 95%

Section: Smahc Chevron Fabricationmentioning

confidence: 99%

Design, fabrication, and testing of a SMA hybrid composite jet engine chevron

et al. 2006

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“…Previous work by the present authors demonstrated the feasibility of the active SMAHC chevron concept using a flat prototype, i.e., without the cylindrical radius of curvature [20][21][22][23] . That work also provided the first shape control experimental validation for a recently commercialized (MSC.Nastran and ABAQUS) constitutive model for SMAHC materials and structures [24][25][26][27] .…”

Section: Introductionmentioning

confidence: 96%

Development of a SMA hybrid composite jet engine chevron concept

et al. 2007

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Control of jet noise continues to be an important research topic. Exhaust-nozzle chevrons have been shown to reduce jet noise, but parametric effects are not well understood. Additionally, thrust loss due to chevrons at cruise suggests significant benefit from active chevrons. The focus of this study is development of an active chevron concept for the primary purpose of parametric studies for jet noise reduction in the laboratory and technology development to leverage for full scale systems. The active chevron concept employed in this work consists of a laminated composite structure with embedded shape memory alloy (SMA) actuators, termed a SMA hybrid composite (SMAHC). SMA actuators are embedded on one side of the bending axis of the structure such that thermal excitation generates a moment and deflects the structure. Two active chevron concepts are demonstrated; one that is powered to immerse and one that is powered to retract. A brief description of the chevron designs is followed by details of the fabrication approach. Results from bench-top tests are presented and correlated with predictions from a numerical model. Very repeatable performance is achieved with excellent agreement between predicted and measured results. Although the deflection requirement is not achieved in the presented results, the approach to meeting the performance requirement is evident.

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“…This topic is currently of significant interest for a variety of advanced aerospace vehicle applications, e.g., see a related publication 15 . Note that use of the ECTE model for shape control applications should be limited to cases in which the recovered strain of the SMA actuators is small relative to the prestrain, unless accommodations are made to schedule diminishment of actuation authority.…”

Section: Cantilevered Smahc Beammentioning

confidence: 99%

Analysis of SMA hybrid composite structures using commercial codes

Turner

Patel²

2004

SPIE Proceedings

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A thermomechanical model for shape memory alloy (SMA) actuators and SMA hybrid composite (SMAHC) structures has been recently implemented in the commercial finite element codes MSC.Nastran and ABAQUS. The model may be easily implemented in any code that has the capability for analysis of laminated composite structures with temperature dependent material properties. The model is also relatively easy to use and requires input of only fundamental engineering properties. A brief description of the model is presented, followed by discussion of implementation and usage in the commercial codes. Results are presented from static and dynamic analysis of SMAHC beams of two types; a beam clamped at each end and a cantilevered beam. Nonlinear static (post-buckling) and random response analyses are demonstrated for the first specimen. Static deflection (shape) control is demonstrated for the cantilevered beam. Approaches for modeling SMAHC material systems with embedded SMA in ribbon and small round wire product forms are demonstrated and compared. The results from the commercial codes are compared to those from a research code as validation of the commercial implementations; excellent correlation is achieved in all cases.

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Design, fabrication, and testing of SMA-enabled adaptive chevrons for jet noise reduction

Cited by 19 publications

References 10 publications

Design, fabrication, and testing of a SMA hybrid composite jet engine chevron

Design, fabrication, and testing of a SMA hybrid composite jet engine chevron

Development of a SMA hybrid composite jet engine chevron concept

Analysis of SMA hybrid composite structures using commercial codes

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