REG NASA-LLIS-0335-1994 Lessons Learned - LARC Developed Digital Dynamic Stability Instrumentation with Less Drift and Scatter.pdf

1、Lessons Learned Entry: 0335Lesson Info:a71 Lesson Number: 0335a71 Lesson Date: 1994-07-13a71 Submitting Organization: LARCa71 Submitted by: Bernard LewisSubject: LARC Developed Digital Dynamic Stability Instrumentation with Less Drift and Scatter Description of Driving Event: NASA Langley personnel

2、successfully completed for end users a series of shakedown tests for a new dynamic stability instrumentation system. The system replaces a 25-year-old electromechanical analog instrumentation system that is obsolete. The new system is the only one of its kind in the U.S. and required 5 man years of

3、effort for its development. It uses state of the art digital signal processors to acquire balance force and moment data; to compute, display, and plot static and dynamic aerodynamic damping coefficients; and to compute and display spectral information. All of this information is now provided in real

4、-time during wind-on tunnel conditions. A National Aerospace Plane configuration test techniques demonstrator was tested at the unitary plan wind tunnel repeating identical tunnel conditions from a test conducted in 1990 using the old system.Data was taken at two different mach numbers and over seve

5、ral different angles of attack. The new system reproduced the previous data with less observed drift and scatter. NASA Langley is the only research enter in the U.S. currently conducting dynamic stability research.Personnel involved in developing this system are: Dr. Ping Tcheng, Dr. John Tripp, Dou

6、glas Wong, Tommy Jordan, Taumi Daniels, and David Hare.Lesson(s) Learned: With the LARC developed dynamic stability instrumentation system, data with less observed drift and scatter can be produced than that produced with the electro-mechanical analog instrumentation system it replaces.Recommendatio

7、n(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-The system is in operation at the NASA LARC unitary plan wind tunnel.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 Exploration System

8、sa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Test FacilityAdditional Info: Approval Info: a71 Approval Date: 1994-08-11a71 Approval Name: Charles Cockrella71 Approval Organization: AFa71 Approval Phone Number: 804-864-3361Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-