Rotorcraft System Identification: An Integrated Time-Frequency Domain Approach

The problem of rotorcraft system identification is considered and a novel, two step technique is proposed, which combines the advantages of time domain and frequency domain methods. In the first step, the identification of a black-box model using a subspace model identification method is carried out, using a technique which can deal with data generated under feedback; subsequently, in the second step, a-priori information on the model structure is enforced in the identified model using an H-infinity model matching method. A simulation study is used to illustrate the proposed approach.