An Experimental Study on the Interaction of Thermal Loading and Mechanical Loading in Membrane Structures

Abstract

Maintenance of membrane structures geometry is crucial for them to be utilised in some space missions, including membrane antennae being developed at the Canadian Space Agency. In the harsh space environment, thermal loading and mechanical loading both can cause the distortion of membrane surfaces. Their effects on surface distortion will interact with each other. In order to properly design active control system, the interaction needs to be well understood. An experimental setup is designed for this purpose. A square membrane is subjected to mechanical loading provided by corner tension forces and thermal loading provided by a ceramic heater. Surface profile of the membrane is measured using the photogrammetry technique. In cases of symmetric thermal loading and asymmetric thermal loading, different mechanical loading cases are evaluated in terms of mitigating surface distortions. Some results are compared and explained using numerical results. Finally, the controllability of membrane structures is discussed using the results from these experiments.

Temperature Dependent Frequency Response of a Constant Tension Membrane

“…al. 7 investigated the effect of combined thermal-mechanical loading on membrane surface distortion with application to designing an active control system for maintaining surface accuracy. In a numerical study Johnston 8 determined the stress state and static shape of a sunshield membrane subjected to thermal and mechanical loads.…”

Adaptive Shape Control for Thermal Deformation of Membrane Mirror with In-plane PVDF Actuators

“…A series of tests on membrane shape control with SMA wires were undertaken by the Canadian Space Agency. A generic algorithm-based control system was developed and tested on a square membrane by Peng et al [14][15][16][17] and Wang et al [18][19][20] investigated active flatness control of membrane structures under thermal and mechanical loads with SMA actuators. Furthermore, Shan et al [21] in York University developed a photogrammetry software to measure the flatness of a membrane structure that actively boundary controlled by SMA wires.…”