jonathan lesage asme dsc 2010
TRANSCRIPT
Electric control surface actuation • Goal: Retrofit of the hydraulic control surface actuators with
electromechanical systems
Retrofit Actuator Package
Hydraulic system
Electromechanical system
Figure 1: Existing hydraulic actuation system [2] and prototype electromechanical system. Adapted from Ref. [9]
• Cons of electrical retrofit • Power consumption during holding
maneuvers • Strenuous loading demands
• Benefits of electrical retrofit • Reduced whole lifecycle
expenses • Maintainability • Energy conversion efficiency
Synthesis Methodology - Overview
System model for synthesis • Linearized 2-port impedance model
• Dynamics of interest for ocean disturbance rejection
Derived via transmission matrices
Specifications on Response • Reject Pierson-Moskowitz wave spectrum induced torques
• Desired rejection response produced by attenuating natural response over wave spectrum frequencies
Resulting impedance function
• Positive real – Purely passive realization exists • Brune Elements – Requires complex transformers • Further options for physical realization
• Model reduction (balanced realization) • Active and passive components (functional expansion)
Physical Realization of Impedance • Purely active realization – actuator as impedance
• Passive and active hybrid architecture
Design energy consumption comparison • Energy consumption as metric for design selection
• Simulated actuator energy required for regulation control • Ocean disturbances imposed
• For this design iteration, active impedance control in actuator consumed minimal energy
• Purely passive realization would minimize energy for rejection