Coherent Lidar Turbulence Measurement for Gust Load Alleviation
Soreide, David and Bogue, Rodney K. and Ehernberger, L.J. and Bagley, Hal (1996) Coherent Lidar Turbulence Measurement for Gust Load Alleviation. Technical Report NASA TM-104318, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
Atmospheric turbulence adversely affects operation of commercial and military aircraft and is a design constraint. The airplane structure must be designed to survive the loads imposed by turbulence. Reducing these loads allows the airplane structure to be lighter, a substantial advantage for a commercial airplane. Gust alleviation systems based on accelerometers mounted in the airplane can reduce the maximum gust loads by a small fraction. These systems still represent an economic advantage. The ability to reduce the gust load increases tremendously if the turbulent gust can be measured before the airplane encounters it. A lidar system can make measurements of turbulent gusts ahead of the airplane, and the NASA Airborne Coherent Lidar for Advanced In-Flight Measurements (ACLAIM) program is developing such a lidar. The ACLAIM program is intended to develop a prototype lidar system for use in feasibility testing of gust load alleviation systems and other airborne lidar applications, to define applications of lidar with the potential for improving airplane performance, and to determine the feasibility and benefits of these applications. This paper gives an overview of the ACLAIM program, describes the lidar architecture for a gust alleviation system, and describes the prototype ACLAIM lidar system.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Aircraft operation, Aircraft sensors, Backscatter, Gust, Lidar, Load alleviation, Turbulence |
| Subjects: | Aircraft/Project: DC-8 (01 - 09) Aeronautics: (06) Avionics And Aircraft Instrumentation Aircraft/Project: Miscellaneous Aircraft/Project: SR-71 Blackbird |
| ID Code: | 198 |
| Deposited On: | 16 July 2004 |
| Additional Information: | 18 pages. Presented as SPIE paper 2832-05 at the SPIE 1996 International Symposium on Optical Science, Engineering, and Instrumentation, August 4–9, 1996, Denver, Colorado. D. Soreide, Technical Consultant, Seattle, Washington. R.K. Bogue and L.J. Ehernberger, NASA Dryden Flight Research Center, Edwards, California. H. Bagley, Coherent Technologies, Inc., Boulder, Colorado |
