1 / 17

Dynamic Modeling PDR

Dynamic Modeling PDR. Dynamic Modeling Preliminary Design Review for Vehicle and Avionics October 17, 2000 Presented By: Christopher Peters …and that’s cool Team DR 2 Chris Curtis Loren Garrison Jeff Rodrian Mark Blanton. Dynamic Modeling PDR. Presentation Outline:

wolivera
Download Presentation

Dynamic Modeling PDR

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Dynamic Modeling PDR Dynamic Modeling Preliminary Design Review for Vehicle and Avionics October 17, 2000 Presented By: Christopher Peters …and that’s cool Team DR2 Chris Curtis Loren Garrison Jeff Rodrian Mark Blanton

  2. Dynamic Modeling PDR Presentation Outline: • General Dynamic Model Buildup • Component Description • Mathematical/Physical Approach • Methods • Results • Conclusion • Progress Plan

  3. Dynamic Modeling PDR General Dynamic Model Buildup for YAW-Feedback Loop Pilot Rudder Input δrc(Volts) Transmitter Aircraft Model Dutch Roll Approx. δr r + Receiver Servo - + kr Gain Selector and Feedback sign implementation Washout Filter Rate Gyro

  4. Dynamic Modeling PDR Component Description • Transmitter • Receiver • Servo • Block Diagram • Dynamic Model • Simulation • Airplane Dynamic Model for Yaw Feedback • Non-Linear vs. Linear • Dutch-Roll Approximation • For small dihedral effect, mainly sideslipping and yawing • Gain Selector • Washout Filter • Rate Gyro

  5. Dynamic Modeling PDR Simulink Servo Model • Not Specified FUTABA Model • Actual model determined by testing, hopefully soon…

  6. Dynamic Modeling PDR Mathematical/Physical Approach • General Transfer Function for Dutch-Roll Approximation: • Terms Described in Subsequent Slides

  7. Dynamic Modeling PDR Lateral-Directional, Dimensional Stability Derivatives Lateral Acceleration per Unit Sideslip Angle Lateral Acceleration per Unit Yaw Rate Lateral Acceleration per Unit Rudder Angle Yaw Angular Acceleration per Unit Sideslip Angle Yaw Angular Acceleration per Unit Yaw Rate Yaw Angular Acceleration per Unit Rudder Angle Dynamic Pressure

  8. Dynamic Modeling PDR Lateral-Directional, Dimensional Stability Derivative Coefficients

  9. Dynamic Modeling PDR Lateral-Directional, Dimensional Stability Derivatives and Coefficients… Continued: [rad-1] DR2 C182 MP-X5 Cyβ -0.30 -0.31 -0.34 Cyr 0.22 0.21 0.32 Cyδr 0.194 0.187 0.24 Cnβ 0.108 0.065 0.16 Cnr -0.079 -0.099 4.84 Cnδr -0.073 -0.066 -0.11

  10. Dynamic Modeling PDR Lateral-Directional, Dimensional Stability Derivatives and Coefficients… Continued: Yβ = -9.09 ft/s2 Yr = 1.07ft/s Yδr = 5.88 ft/s2 Nβ = 5.87 s-2 Nr = -0.69 s-1 Nδr = -3.96 s-2 • All Evaluated at ρ= 2.335e-03slugs/ft3 (600ft) and Vloi = 24 ft/s • Difficult to compare to other values do to dependency on Vloi

  11. Dynamic Modeling PDR Transfer Function, Damping Ratio and Natural Damped Frequency: Open Loop (OL) • Numerator • Constant Coefficient 0

  12. Dynamic Modeling PDR Constant Coefficient:

  13. Dynamic Modeling PDR Stability Analysis Closed Loop (CL)

  14. Dynamic Modeling PDR Stability Analysis (CL)

  15. Dynamic Modeling PDR Washout Filter • Depends on Selection of Feedback Implementation • Might not be needed • For Destabilizing Effects • To Visualize Dutch Roll Mode • Might be needed • If Rate Gyro is supposed to stabilize Aircraft • Depends on Roll/Yaw Effects • Very Simple T.F.: s/(s+c), c = 1,2,3

  16. Dynamic Modeling PDR Rate Gyro • No Specifications yet… BUT • We still have a week left…

  17. Dynamic Modeling PDR Progress Plan • Improve Current Values as Design continues to improve • Analyze Pitch and Roll Dynamic Models • Complete Stability and Control Analysis • Simulate Components and Aircraft to obtain A PRIORI Model • Compare Results to Mark Peters’ Analysis

More Related