A new twist on power walking
September 09, 2005
Laptop Battery MBL scientist invents backpack that empowers wearers to generate
their own electricity
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Thinkpad WOODS HOLE, MA-In an unprecedented breakthrough in the
development of portable and renewable human-driven energy sources,
an MBL (Marine Biological Laboratory) biomechanics expert who
studies how muscle moves skeletons in fish and frogs has invented a
backpack that gives new meaning to the term power walking.
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Microsoft In a paper published in the September 9 issue of Science,
Lawrence C. Rome, a University of Pennsylvania biology professor
who spends his summers conducting research at the MBL, and three
colleagues describe the mechanics of, and physics behind, the
Suspended-load Backpack, a piece of gear that will one day enable
field scientists, hikers, explorers, soldiers, and disaster workers
to convert mechanical energy generated by walking with a heavy load
on their backs into electricity.
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Laptop Computers By carrying a load weighing from 44 to 84 pounds (20 to 38 kg),
Suspended-load Backpack testers were able to generate up to 7.4
Watts-more than enough electricity to simultaneously power an MP3
player, a PDA, night vision
goggles (or 3 LED headlamp), a
handheld GPS, a CMOS image decoder, a GSM terminal in talk mode,
and Bluetooth. The electricity can be used while it is being
generated, or it can be stored in a lightweight rechargeable
battery for later use, greatly
reducing the need to haul and use heavy replacement
batteries.
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Laptop Computer "The need for electronic devices in remote areas is an
increasing reality these days," says Rome. "Throughout history,
humans have solved many problems by inventing passive devices to
enhance the movements made by their muscles, such as springy bamboo
poles to carry loads and skis to move through snow," he says. "The
Suspended-load Backpack represents another passive device that may
help solve a growing problem in the 21st century."
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Desktop Computer The backpack, which is currently in its working prototype stage,
is based on the external frame design once popular with overnight
backpackers. It works by capitalizing on the up-and-down motion of
the body during walking.
Notebooks When walking, the body is like an inverted pendulum. After the
foot is put down to take a step, the body vaults over it, causing
the hip to move up and down about 1.6 to 2.7 inches (4 to 7 cm).
The Suspended-load Backpack frame sits still on the wearer's back,
and the load is mounted on a load plate that is suspended from the
frame by springs. The springs allow the load to slide up and down
on bushings constrained to vertical rods, thus allowing the load to
move with the same vertical motion as the hip, but lagging it by a
fraction of a second, producing differential movement between the
frame and load. The pogo-stick-like movement of the load generates
mechanical energy that drives a rack-and-pinion device that powers
a geared DC motor that acts as a generator mounted on the frame.
The load plate can be locked to stop the device from sliding up and
down and generating electricity.
Lenovo To assure that the backpack wouldn't require users to expend too
much additional metabolic energy, the scientists performed a
variety of tests on six male subjects, who used the backpack while
walking on a treadmill.
Hard Drive The backpack was instrumented with force transducers and length
transducers, which measured the amount of mechanical energy going
into the backpack's generator. The scientists also measured the
test subjects' oxygen consumption and carbon dioxide production
rates to gauge the metabolic cost of generating electricity with
the backpack.
Travelstar The scientists discovered that the Suspended-load Backpack
altered the gait of the test wearers, causing them to walk more
efficiently. Because of this, the testers used less metabolic
energy to generate electricity than anticipated. The tests also
showed that the backpack wearers could generate more electricity by
either walking faster or
carrying a heavier load or both.
Gateway While Rome and his colleagues haven't yet determined the
biomechanical causes of the backpack's better-than-expected
efficiency, they say it confirms that the backpack is practical and
that the technology can be applied to making a standard backpack
that is more ergonomic.
Laptop Parts "It seems that most everyone in the world uses a backpack to
carry things, and the possibility of doing it more ergonomically
and also providing electricity in remote areas may have widespread
benefits, some of which we can't even anticipate today," says
Rome.
Software A Pennsylvania-based company called Lightning Packs LLC has been
formed to further develop and refine the Suspended-load Backpack
and to develop an ergonomic backpack based on the working prototype
and initial findings. Lightning Packs has applied for patent
protection on both inventions.
Hard Drives Marine Biological Laboratory
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