conduc t ed a t th e I ns t it u t e for F luid M ec h anics (FLM) of th e T ec h nisc h e U niv ersitüa t Müunc ... t em p oral c h arac t eris t ics of th e uns t eady fl o w v elocit ies . ... U∞. (high-α). Vortex bursting. Fig. 1: Fin buffet flow characteri¡ tic¢ . £¤£¤£¤£ ... F or ac t iv e v ibra t ion alle v ia t ion v arious ac t ua t ors h a v e been.
(SYA) 35-1
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Paper presented at the RTO AVT Symposium on “Advanced Flow Management: Part A – Vortex Flows and High Angle of Attack for Military Vehicles”, held in Loen, Norway, 7-11 May 2001, and published in RTO MP-069(I).
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5a. CONTRACT NUMBER
Aerodynamic Active Vibration Alleviation for Buffet Excited Vertical Tails
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Also see: ADM001490, Presented at RTO Applied Vehicle Technology Panel (AVT) Symposium held inLeon, Norway on 7-11 May 2001, The original document contains color images. 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: a. REPORT
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;ß+ á ò>Ü>ÝXð XAâÝ jáhã¨àhâÝjáð]Ýjâ#,ðGä ïaäÙ)à6ßï' åUæ¸ñ*âAä]ïä]ïaòâ[ß´ÝXçµßïç Ü2#vßÝXç5biâïð^áYf+Ü>á6ï2 ^å]æè[ß)àhá6ï2 já6Ý @+åHä]ï>áw)ïñßæßsåNð^â)á6ïàhâ+Ü>ï' já6Ýb;aä C;< jÜ>Ýjò>Üaå]á6ïàháå]áGAáhåNð£ä]ïÅ ;>áw;aäk;2@ Ë Vortex bursting
αmax
U∞ (high-α)
Wake flow of burst leading-edge vortex affects the vertical tail (fin)
Structural dynamic loads [g]
Extension of flight envelope
Aerodynamic fin excitation strong increase above certain α
ê
Spectral density of fin normal force
ê
narrow-band loads
ë ency Frequ é f attack Angle o ì7í4îïMð'ñØì7í4òÊó5ô|õ¸ö÷wøùúüûý5þCÿGþ'ûR÷oöÿGí ÷íKû Rï
with active control
Aerodynam ic limit
ê ê
Structural limit
Reduced structural loads
Improved uvermane ability
7ì í4îï ñ òûRÿGöþ öÉí4ò öÿ 0Angle ù'ÿ þoòf ûRattack öó þ2ûG÷í 2ö ó5ô|õ¸ö÷ 4ù'þ *þ 4ö í4þC÷í ù2ò7ï
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A 0- A
+
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Vane
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Accelerometer
-
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1
Rotating / oscillating slotted cylinder
Actuator
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/
A
/
δ
A
.
Cylinder Accelerometer
2
Torque tube Servo motor
Feedback control device
Feedback control device
Accelerometer
Root control
5
Feedback control device
Accelerometer
Active rudder
Piezo ) interface at *"*"* fin root
Accelerometer
Active auxil3 iary rudder
-
Actuator Rudder actuator
Feedback control device
Feedback control device
Feedback control device
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Frequency [Hz]
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(SYA) 35-13
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