Comparative Analysis of Parameter Estimation Techniques for Modelling a Twin Rotor MIMO System

In this paper, we investigate the parameter estimation techniques for the modelling of Twin Rotor Multi Input Multi Output System and make a comparative study for the applied estimation techniques based on the generated model's fit to the actual system. Time delay problem in twin rotor systems specifically during the hovering of the system is the major issue that needs to be addressed strongly for finding a solution. In order to address the time delay issues, the system should be modelled appropriately to pave way for designing accurate control methodologies. Parameter estimation techniques like Autoregressive with Exogenous Input (ARX) and Autoregressive Moving Average with Exogenous input (ARMAX) methods are used to model the system. Extended Least Square algorithm is used to tune the obtained model. The model obtained by using ARX method was found to be more suitable for the system as they were more resistant to noise interference. A complete analysis of different order of systems of ARX and ARMAX models of one Degree Of Freedom(DOF) is performed.