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- The stairs with a spring to be compressed when someone walks down the stairs, saving the energy dissipated in another way through the impact.
- The climb, the stairs bring to the people an impulse, releasing the stored energy, making it a 37% easier to the knee.
- The device low-power can be placed on existing stairs and does not have to be permanently installed.
Researchers from the Georgia Institute of Technology (Georgia Tech) and Emory University, in the united States, have created a device that makes it easier to walk the stairs. These scientists have built stairs that recycled energy, store the energy of a user during descent and return the energy to the user during the ascent.
The stairs spring are compressed when someone walks down the stairs, saving the energy dissipated in another way through the impact, and holding back a 26% of the forces in the ankle. When climbing, the stairs bring to the people a boost releasing the stored energy, making it 37% more easy for the knee joint, using stairs conventional. The device of low power can be placed on existing stairs and does not have to be permanently installed.
Each ladder is attached by springs and equipped with pressure sensors. When a person is low, each step sinking slowly until it blocks and is level with the next step, storing the energy generated by the user. It remains so until someone walks up. When a person climbs stairs walks on the sensor in the tread next up, the latch on the step bottom is released and the energy stored in the spring is released, lifting the hind leg.
the authors of the research, which is detailed in an article published in the journal Plos One, they say that the initial idea was to wear shoes, prosthetic recycling of energy to help people to climb stairs. “Unlike the normal walking in which each tap of the heel dissipates the energy that can be potentially recovered, the ascent of the ladder is really very energy-efficient, the greater part of the energy you put out is transformed into potential energy to get up,” explains Karen Liu School of Interactive Computing.
“But then I realized that down is a waste, diffuse power to avoid falling, and I thought that it would be great if we could store the energy wasted during the descent and returned to the user during the ascent,” adds Liu, who is co-author of the article with her colleague Lena Ting, associate professor of Biomedical Engineering in the Department of Biomedical Engineering Wallace H. Coulter Emory and Georgia Tech.
“Walking up stairs is like stepping on the brakes of the car while you turn the engine -you put as an example-Ting. Your legs use a lot of power in each step to avoid falling too fast. Our ladders stored that energy instead of wasting it”. The researchers did not expect, before designing the device, that the stairs actually alleviate the impact of going down.
“The spring on the stairs, instead of the ankle, acts as a cushion and brake”, pointing to Yun Seong Song, who built the device as a postdoctoral researcher at Georgia Tech and is currently an assistant professor at the University of Science and Technology of Missouri, united States. “The smooth movement down relieves the work of the ankle, that is what keeps you balanced and prevents you from falling too fast on the stairs normal,” he adds.
July 17, 2017
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