AN ADAPTIVE CONTROL SYSTEM BASED ON PID, I2PD AND RLS, A SIMULATED DESIGN FOR UAVS

• Main Authors: Gärtner, Johan, Johansson, Philip
• Format: Others
• Language: English
• Published: Mälardalens högskola, Akademin för innovation, design och teknik 2017
• Subjects: RLS; PID Controller; UAV; quadrotor; adaptive control; I2PD; simulation; Control Engineering; Reglerteknik
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-35614

During this master thesis an adaptive control system for angular velocity was developed. The approach focuses on radio controlled quadrotors and thereby targets a computational efficient solution. The adaptation is divided into two steps. First, an Integral Squared Plus Time Delay (I2PD) model estimation is done through the Recursive Least Squares (RLS) algorithm. Second, control parameters for the quadrotors Proportional Integral Derivative (PID) controller are found by using empirically modified Tuning Rules (TRs) which are based on the I2PD model. Simulation results show the benefits of an adaptive tuning algorithm in regards of the time consuming process of manually tuning a PID controller as well as robustness against both predictable and unpredictable system changes. This includes actuator degradation, battery consumption, changes in weight or inertia etc. However, it is apparent that the tuning algorithm demands an arbitrary initial approximation to be stable at initialization.