Time and Frequency-Domain Identification and Verification of BO 105 Dynamic Models
Abstract
Mathematical models for the dynamics of the DLR BO 105 helicopter are extracted from flight test data using two different approaches: frequency-domain and time-domain identification. Both approaches are reviewed. Results from an extensive data consistency analysis are given. Identifications for 6 degrees of freedom (DOF) rigid body models are presented and compared in detail. The extracted models compare favorably and their prediction capability is demonstrated in verification results. Approaches to extend the 6 DOF models are addressed and first results are presented. System identification is broadly defined as the deduction of system characteristics from measured data. It provides the only possibility to extract both non-parametric (e.g. frequency responses) and parametric (e.g. state space matrices) aircraft models from flight test data and therefore gives a reliable characterization of the dynamics of the actually existing air-craft. Main applications of system identification are seen in areas where higher accuracies of the mathematical models are required: Simulation validation, control system design (in particular model- following control system design for in-flight simulation), and handling qualities. (KR)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1989
- Accession Number
- ADA216828
Entities
People
- Jay W. Fletcher
- Juergen Kaletka
- Mark B. Tischler
- Wolfgang V. Gruenhagen