Size estimation tools for conventional actuator system prototyping in aerospace

Abstract

Predicting the size of an actuator capable of reaching given performance requirements isa critical step for any systems design. Thus, to help in the prototyping and early developmentstages of such devices, simple mathematical models were developed, which can be used withlittle knowledge in actuation system design. Based on physical phenomenons at the heart ofthe actuation mechanism, these models can be used to estimate diameter and length, and there-fore volume and weight of conventional actuators as a function of performance requirements.Models include linear hydraulic pistons and electric motors, divided into radial and axial fluxmachines. Off-the-shelf actuators and more aerospace specific products were used to validateand assess the accuracy of the models over a wide range of force and torque requirements.Simple sizing examples for aerospace actuation systems are also given as use-cases of the different tools. A discussion on model applicability, for various aircraft scales and applicationsconcludes the paper.