方向舵和装载.ppt

12/12/2002 Introduction Contents Design and Certification Requirements Operational Summary Training Issues Contents Design and Certification Requirements Operational Summary Training Issues Design And Certification Requirements Vertical Stabilizer And Rudder Objectives Effects Of Rudder Deflection On A/c Directional Control Loads On Vertical Stabilizer And Rudder Certification Requirements Rudder Deflection Limiting Devices Yaw Control Schematics Summary Vertical Stabilizer And Rudder Objectives To provide yaw stability To provide directional control (T/O and LDG with X-wind) To balance any yaw asymmetry(thrust and/or drag asymmetry) Effect Of Rudder Deflection On A/C Directional Control Rudder deflection is the sum of: Pedal input Yaw damper input Rudder deflection may be limited by a limiter (based on airspeed) Design And Certification Requirements Design And Certification Requirements Rudder input: As a primary effect, will create a yaw moment inducing sideslip buildup (?) As a second effect, sideslip will induce roll As a consequence, roll induced by a rudder input comes on with a time delay, except with FBW A/C with an active roll rate control law Design And Certification Requirements Design And Certification Requirements Abrupt and large rudder pedal input generates a dynamic yaw moment with very large transient sideslip (overshoot) This large sideslip will induce a very large roll rate after a significant time delay(except on FBW A/C with an active roll rate control law) Design And Certification Requirements In flight, the pilot uses the rudder to control YAW In order to zero sideslip by centering the ball or the index on a PFD In order to align the aircraft with the runway axis in crosswind conditions Design And Certification Requirements Contents Design and Certification Requirements Operational Summary Training Issues Rudder Must Be Used Rudder Should Not Be Used Rudder Must Not Be Used Contents Design and Cer