Design of Notch Filters for Structural Responses with Multiaxis Coupling

Abstract

A novel method for designing notch e lters to attenuate structural responses that show signie cant cross-coupling (betweenaxes )ispresented.Thisapproachdiffersfromtheconventionalmethodsinthatitisasingle-stepprocedure that enables notch e lters of each sensor path to be designed independently of those in other sensor paths while guaranteeing the stability margin requirements. As a result, this approach can result in a less conservative design as compared to the conventional methods. Thispaperdescribes theprocedure in thecontext of thecoupled lateraldirectional axes of an aircraft— the objectivebeing to gain stabilizethe structural response uniformly so as to meet the MIL-F-9490D specie cations. An example is given to illustrate the power of this method.