Daily Bread for 9.22.15 – 2017

Good morning, Whitewater.

Tuesday in Whitewater will be mostly sunny with a high 0f seventy-nine degrees. Sunrise is 6:42 and sunset 6:51. for 12h 08m 56s of daytime. The moon is a waxing gibbous with 61.4% of its visible disk illuminated.

Whitewater’s Urban Forestry Commission meets at 4:30 PM, and the Police & Fire Commission at 7:30 PM.

On this day in 1862, Pres. Lincoln released the preliminary Emancipation Proclamation, to take effect January 1, 1863.

Small drones are useful for photography, but in the video below, one sees that they can be programmed to build bridges or other structures:

In this work, a rope bridge that can support the crossing of a person is built by quadrocopters, showing for the ?rst time that small ?ying machines are capable of autonomously realizing load-bearing structures at full-scale and proceeding a step further towards real-world scenarios. Except for the required anchor points at both ends of the structure, the bridge consists exclusively of tensile elements and its connections and links are entirely realized by ?ying machines. Spanning 7.4 m between two scaffolding structures, the bridge consists of nine rope segments for a total rope length of about 120 m and is composed of different elements, such as knots, links, and braids. The rope used for these experiments is made out of Dyneema, a material with a low weight-to-strength ratio and thus suitable for aerial construction. Of little weight (7 g per meter), a 4 mm diameter rope can sustain 1300 kg.

The vehicles are equipped with a motorized spool that allows them to control the tension acting on the rope during deployment. A plastic tube guides the rope to the release point located between two propellers. The external forces and torques exerted on the quadrocopter by the rope during deployment are estimated and taken into account to achieve compliant ?ight behavior. The assembly of the bridge is performed by small custom quadrocopters and builds upon the Flying Machine Arena, a research and demonstration platform for aerial robotics. The arena is equipped with a motion capture system that provides vehicle position and attitude measurements. Algorithms are run on a computer and commands are then sent to the ?ying machines via a customized wireless infrastructure.

In order to be able to design tensile structures that are buildable with flying robots, a series of computational tools have been developed, specifically addressing the characteristics of the building method. The design tools allow to simulate, sequence, and evaluate the structure before building.

The location of the scaffolding structure is manually measured before starting the construction. The primary and bracing structure can then be realized without human intervention. Before realizing the stabilizers, the locations of the narrow openings of the bridge are measured and input to the system, which adapts the trajectories accordingly.

Via YouTube.

A Google a Day asks a science & technology question:

Of the five NASA space shuttles, which one flew the most missions?

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