Stiffness and Vibration Characteristics of Inflatable Delta Wing Models at Temperatures up to 650°F

Item

Title
Stiffness and Vibration Characteristics of Inflatable Delta Wing Models at Temperatures up to 650°F
Date
1966
Index Abstract
Coming Soon
Photo Quality
Complete
Report Number
AFFDL TR 66-14
Creator
Pollock, Samuel J.
Corporate Author
Air Force Flight Dynamics Laboratory
Laboratory
Air Force Flight Dynamics Laboratory
Extent
108
Identifier
AD0803266
Access Rights
Export Control
Distribution Classification
1
Contract
AF 33(615)-1880
DoD Project
1370
DoD Task
137003
DTIC Record Exists
No
Distribution Change Authority Correspondence
AFFDL LTR
Abstract
Stiffness and vibration data were obtained on inflatable Airmat models for various internal pressures from 2 to 10 psi and temperatures up to 650 F. The semi-span 65 deg delta wing models were woven from stainless steel monofilament wire and coated with high temperature silicone elastomer. Deflection and vibration characteristics were predicted using shear theory. Vibration predictions were also made using measured influence coefficients. Shear theory agreed with experimentation for deflections due to uniform load except near the leading edge where experimental deflections were smaller due to the stiffening effect of the rounded edges. Correlation of shear theory prediction for vibration frequencies with experiment improved as internal pressure increased to 10 psi. Vibration calculations using measured small deflection influence coefficients agreed with experimentation. Model vibration frequencies decreased as temperature was increased from 70 F to about 300 F. From 300 F to 650 F, vibration frequencies increased. At 650 F, the vibration frequency for a model without ceramic frits in the silicone elastomer coating was 32% higher than the room temperature frequency; for a model with ceramic frits the frequency was 10% lower. Mode shapes did not change appreciably with temperature. Structural damping coefficients decreased with increasing temperature.
Report Availability
Full text available
Date Issued
1966-06
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Media
AFFDLTR66-014.pdf