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Building A Rope Bridge With Drones



#drones #science #tech #technology #design #engineering #geek

http://gabeweb.tumblr.com/post/129620230676/building-a-rope-bridge-with-drones-in-this-work-a
Building A Rope Bridge With Drones

In this work, a rope bridge that can support the crossing of a person is built by quadrocopters, showing for the first time that small flying 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 flying 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 flight 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 flying 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.

(story from ETH Zurich)
Link to source
Gabe™ 6 years ago from Diaspora

Over-Unity Reactionless Generator Invented In India



Obrázek/fotografie

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p style="text-align: center;">“Ere many generations pass; our machinery will be driven by a power obtainable at any point in the universe.” – Nikola Tesla

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p style="text-align: center;">A Reactionless AC Synchronous Generator (RLG) has been invented by Paramahamsa Tewari, electrical engineer and former Executive Director of Nuclear Power Corporation of India. His background includes engineering project management for construction of nuclear power stations. The efficiency of models he has built, which have also been independently built and tested, is as high as 250%.

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p style="text-align: center;">In November 2014, I made one of many visits to the laboratory of Paramahamsa Tewari. I had seen the basis for the RLG design in September of 2010. Mr. Tewari showed me a stiff conductor about a foot long which was allowed to rotate at the center and connected at each end with small gauge wire. A magnetic circuit was placed under the conductor. When a current was allowed to flow through the conductor it rotated, due to a torque induced on the conductor according to Flemings Left Hand Rule and standard theory, verified by experiments at the dawn of the electrical age. With a simple rearrangement of the magnetic circuit, the same current produced no rotation – the torque was cancelled. I later duplicated the setup and experiment on my workbench. It is ingenious and lead to his breakthrough, the invention of a reactionless generator with greatly improved efficiency.

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p style="text-align: center;">This experiment has lead to the design and testing of generators with efficiencies far above any previous design. The design uses the same types of materials used in current generators, but the magnetic circuit within the machine is configured to cancel back torque while inducing current and producing power. This might be compared to the rearrangement of materials by the Wright Brothers to build a surface with lift that resulted in manned flight in a time when many, including scientists, said it was impossible. Indeed, physicists who cling to an outdated model of the properties and structure of space have declared what has been done by Tewari to be impossible.

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p style="text-align: center;">During the November testing I witnessed two tests of efficiency on the new model in Tewari’s lab. The second test was several percent better than the first and produced 6.6 KVA with an efficiency of 238%. A second set of stator coils was not connected yet but is expected to increase output to 300%. This is a 3 phase, 248 volt Hz, AC synchronous generator operating at 50 Hz. State of the art, true RMS meters on the input and output that measured KW, KVA, and power factor confirmed the readings of meters we had supplied for tests I observed in April of 2014.

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p style="text-align: center;">We were able to visit a 130-acre factory site of one of the top electrical machinery manufacturing companies in India. At this site the company manufactures rotating electrical machines, including generators. When the chief electrical engineer first saw the drawings and design of the RLG he knew immediately what it meant for efficiency! Because of their confidence in the design, and the results of the tests on the smaller model, the company has assembled a self-excited machine designed to produce 20 KVA.

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p style="text-align: center;">When we arrived at the factory a vice president of the company, the factory general manager, and the chief engineer greeted us. We then inspected the new machine and met the engineering design team assigned to this project. They are electrical and mechanical engineers who design and build conventional generators with output as high as 500 KVA. They are very enthusiastic and understand the breakthrough. A second machine rated at 25 KVA is now under construction at this company in India.

I am not a technician but understand that this is a groundbreaking invention ... read the rest of the story by clicking on the title ... and/or go to http://www.tewari.org

#ParamahamsaTewari #India #generator #engineering #technology #NiolaiTesla #technics #electricity #science

World Truth.TV: Breaking News: Over-Unity Reactionless Generator Invented In India | World Truth.TV (Eddie)

"Ere many generations pass; our machinery will be driven by a power obtainable at any point in the universe." - Nikola Tesla A Reactionless AC Synchronous Generator (RLG) has been invented by Paramahamsa Tewari, electrical engineer and former Executive Director of Nuclear Power Corporation of India.
Link to source
YA 7 years ago from Diaspora
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