REG NASA-LLIS-0339-1994 Lessons Learned - Measurement of Turbulence Limited by Errors in Air Velocity Measurements.pdf

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1、Lessons Learned Entry: 0339Lesson Info:a71 Lesson Number: 0339a71 Lesson Date: 1994-07-14a71 Submitting Organization: LARCa71 Submitted by: Bernard LewisSubject: Measurement of Turbulence Limited by Errors in Air Velocity Measurements Description of Driving Event: The ability to measure from an airb

2、orne platform turbulence in the daytime convective planetary boundary layer has existed for several years. The accuracy of these measurements is, in many cases, limited by the errors in the air velocity measurements. current measurement techniques are typically limited by:a72 Measurements of ambient

3、 air flow made in relatively close proximity to the aircraft and therefore influenced by the flow around the aircraft. a73 A total “system calibration“ that is not based on physical constants. a73 An inability to make reliable measurements in clouds and in precipitation. a73 Mechanical resonances of

4、 the aircraft which may have a detrimental influence on the data quality.Lesson(s) Learned: The accuracy of airborne platform measurements of turbulence in the daytime convective planetary layer is limited in many cases by errors in air velocity measurements.Recommendation(s): In January, 1993, Cohe

5、rent Technologies, Inc., was given a $50,000.00 SBIR Grant to design, build and test a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-remote, air-motion sensing system.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/A

6、Mission Directorate(s): N/AAdditional Key Phrase(s): a73 Aircrafta73 Flight EquipmentAdditional 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-,-,-