Birds' good vibrations power mini backpacks

July 26, 2013
Birds' good vibrations power mini backpacks
A pigeon with a Cornell mini backpack. Credit: Michael Shafer

Birds that yield good vibration provide motion excitation ... for engineers: As Earth warms, birds may be changing their migratory patterns. But to obtain avian data, scientists need in-flight tracking sensors – and those sensors need energy.

Cornell's Laboratory for Intelligent Machine Systems, or LIMS, is developing an ultra-lightweight energy source for small backpacks packed with sensors. The miniature vibrational energy harvesters convert the motion of a bird's body into electrical power. Ephrahim Garcia, Cornell professor of mechanical and aerospace engineering, runs LIMS, and he delves into dynamics and controls, sensors and actuators that involve .

"You can't put a 9-volt battery on a bird, so you need a lightweight energy source," says Michael Shafer, Cornell doctoral candidate who will get his degree in August and begin a new job as an assistant professor at Northern Arizona University.

Shafer is testing his system of removable backpacks and power sources on , which weigh about 300 grams. The can carry only about 4 percent of their mass – or about 12 grams (less than one tablespoon of water) – without disrupting their natural flight dynamics.

Much like human-made aircraft, birds employ aerodynamics and balance. They have a center of gravity and roll control – like the roll and pitch of an aircraft. If the ornithological backpack weighs too much, birds cannot maneuver back to an upright position – and fall to the ground.

Birds' good vibrations power mini backpacks
A close-up view of the Cornell-designed, removable bird backpack that provides energy for in-flight experiments. Credit: Michael Shafer

Despite the light weight, the tiny backpacks condense engineering brilliance, as they feature a microcontroller, an , a memory module, a wireless receiver and a piezoelectric device that serves to transduce the harvested energy into electric power. The harvester gathers up to 300 microwatts, enough juice to power the microcontrollers.

Garcia explains that like canaries in the coal mine, birds outfitted with these systems could serve as environmental sentinels. While other scientists gather information on bird behavior and the impact of environment, his labs focuses making that data possible.

Says Garcia: "Unlike engineering systems of the past, we are creating self-reliant systems. They gather power from their environs to perform their mission indefinitely."

Explore further: Most powerful millimeter-scale energy harvester generates electricity from vibrations

Related Stories

Recommended for you

Interactive tool lifts veil on the cost of nuclear energy

August 24, 2015

Despite the ever-changing landscape of energy economics, subject to the influence of new technologies and geopolitics, a new tool promises to root discussions about the cost of nuclear energy in hard evidence rather than ...

Smart home heating and cooling

August 28, 2015

Smart temperature-control devices—such as thermostats that learn and adjust to pre-programmed temperatures—are poised to increase comfort and save energy in homes.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.