Dissertation > Aviation, aerospace > Aviation > Various types of aircraft > Short-range and vertical - lift aircraft > Helicopters, rotorcraft

Helicopter structural response active control frequency domain method of

Author ZhaoCanFeng
Tutor GuZhongQuan
School Nanjing University of Aeronautics and Astronautics
Course Aircraft design
Keywords Structural response active control Helicopter Global model MMSE Kalman filtering method Frequency domain method Study
CLC V275.1
Type Master's thesis
Year 2010
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Structural response active control is the domestic helicopter engineering widespread concern a tech . In this paper, the helicopter cockpit and cabin location of active vibration problems as engineering background , based helicopter global model of the structural response frequency domain active control method and control processes, carried out the following various items of content study: control convergence of the algorithm , robustness, controllability and prudent controllers theoretical derivation, the relevant explicit conditions , and through simulation can be verified , discussed two recognition algorithm ( least Mean method (LMS) and Kalman filtering (KF) the H ∞ optimality ; using a helicopter measured data , carried out from the time domain to the frequency domain and then return to the time domain vibration control of the whole process of simulation studies to analyze the whole process may encounter major problems , and compared two kinds of recognition algorithm different characteristics ; prepared a frequency domain kernel compilation process , the completion of the DSP and control software development ; in the simulation based on the use of SEED-DEC33 embedded DSP controllers and directed the DSP control software , respectively, for freedom - freedom beams and helicopter body dynamics similar to the model of a single input / single output , four input / two output vibration control testing research , focusing on the weight matrix , recognition algorithm parameter settings, the control effect ; in traditional control algorithm based on aimed at reducing computation , gentle amount of control for identifying the initial value \control the amount of strike double LMS method, two normalized LMS method ( double NLMS France ) and based on the LMS method identified secondary Kalman filtering method , the theoretical derivation and simulation studies . simulation analysis , experimental research , methods to improve have achieved good results for real engineering applications has laid a more solid foundation.

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