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CAD representation of Shady, a truss climbing robot with a deployable sun-shade (spokes; mylar shade not drawn) as an example application.

We work in the new Stata Center building at MIT in a room with a large wall-window which currently has no shades. As many of our desks are directly next to this window we needed some means to block the light from hitting our computer screens. Instead of traditional shades which would block the whole window, detracting from the view, we have decided to build a robot which can climb on the window's aluminum frame. It can thus be positioned on the window to be a localized sunshade.

While many climbing robots have been developed, only a few climb on thin-member truss-like structures. Shady tests some new ideas in design and control, in particular, using mechanical compliances and associated proprioception, and was experimentally verified to be over 99.8% robust over many hours of climbing.

Contents for This Page

Truss Climbing

A map of the wall-window in our lab. The frame of the window (yellow lines) is composed of rigid aluminum members, each about 1 inch wide.

Truss structures are familiar to most of us: railroad bridges, construction scaffolding, and radio towers are common examples. Many structures built in space, for example on the international space station, are also essentially trusses. While most trusses are currently assembled and maintained by humans, it may be advantageous in some cases to have a robot which can climb about the truss to deliver tools and materials, or perhaps to inspect or even assemble new parts of the truss.

While many structure climbing robots have been developed, most do not address the case of climbing on trusses. It can be argued that the penalties for uncertainty are higher when climbing a thin-member truss structure than for some other types of climbing, such as climbing the broad flat surface of a building. In particular, as the robot extends a gripper towards a thin structure it may easily approach misaligned, or even miss the structure completely.

A Demon App: Sun Shading


Compliance and Proprioception

File:shady-barrel-springs-mq.avi File:shady-barrel-compliance-mq.avi File:shady-grip-compliance-mq.avi


Linkage-Based Grip Mechanism

File:shady-grip-oblique-mq.avi File:shady-grip-front-mq.avi
File:shady-grip-end-mq.avi File:shady-grip-rear-mq.avi

Research Context

Experimental Results



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