Design of a High Angle of Attack Robotic Sting Mount for Tests in a Low Speed Wind Tunnel
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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A sting mounting system designed for high angle of attack AOA testing has been developed for the 7x10 foot low-speed wind tunnel LSWT. The mechanism was able to position the model from -15 deg to 90 deg of pitch with accuracy to within 0.2 deg, while keeping the model near the center of the test section. Compatible with the current turntable apparatus, the high angle of attack robotic sting HARS retained the turntables full range of yaw movement of or - 90 deg. All model positioning was done without shutting the tunnel down to manually alter the sting or mounting apparatus. Pitch adjustment progressed at about 4 deg per second, with final position tuning taking nearly 15 seconds. The mechanism consisted of two square steel telescoping tube struts that were joined at the ends in the test section by a cross link that held the existing LSWT small Langley sting. Wind tunnel blockage and flow irregularities near the model were minimized by mounting drive hardware under the tunnel floor. An IBMAT compatible microcomputer equipped with an analog-to-digital conversion board provided position control, drive motor signaling, and input signal filtering. Theses.
- Test Facilities, Equipment and Methods
- Fluid Mechanics