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Design and control of a proof-of-concept active jet engine intake using shape memory alloy actuators
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Song, Gangbing Arnold, Steven M. Lee, Ho-Jun Barr, Todd Ma, Ning Penney Sr., Nicholas |
| Copyright Year | 2004 |
| Description | The design and control of a novel proof-of-concept active jet engine intake using Nickel-Titanium (Ni-Ti or Nitinol) shape memory alloy (SMA) wire actuators is used to demonstrate the potential of an adaptive intake to improve the fuel efficiency of a jet engine. The Nitinol SMA material is selected for this research due to the material's ability to generate large strains of up to 5 percent for repeated operations, a high power-to-weight ratio, electrical resistive actuation, and easy fabrication into a variety of shapes. The proof-of-concept engine intake employs an overlapping leaf design arranged in a concentric configuration. Each leaf is mounted on a supporting bar that rotates upon actuation by SMA wires electrical resistive heating. Feedback control is enabled through the use of a laser range sensor to detect the movement of a leaf and determine the radius of the intake area. Due to the hysteresis behavior inherent in SMAs, a nonlinear robust controller is used to direct the SMA wire actuation. The controller design utilizes the sliding-mode approach to compensate for the nonlinearities associated with the SMA actuator. Feedback control experiments conducted on a fabricated proof-of-concept model have demonstrated the capability to precisely control the intake area and achieve up to a 25 percent reduction in intake area. The experiments demonstrate the feasibility of engine intake area control using the proposed design. |
| File Size | 414588 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040082466 |
| Archival Resource Key | ark:/13960/t1pg6n401 |
| Language | English |
| Publisher Date | 2004-06-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Electric Potential Actuators Shape Memory Alloys Nitinol Alloys Control Systems Design Engine Inlets Electrical Resistance Feasibility Analysis Feedback Control Smart Materials Jet Engines Real Time Operation Fabrication Nonlinearity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
