Design of helicopter stabilization systems using optimal control theory.

A technique is described for the design of multivariable controllers for helicopters, based on results obtained recently in optimal control theory. For a specified quadratic performance index, the optimal feedback controller is obtained by solving a matrix Riccati equation. A method of determining the performance index which yields a desired response is outlined in the paper. The solution represents the fastest response that can be obtained for a specified amplitude of anticipated disturbance and a limited controller output. An example is worked out in detail to indicate the effectiveness of the method.