Energy Scavenging Resonator for Wireless Sensor Networks

"Foster-Miller proposes to develop a novel self-optimizing energy scavenging device for condition-based maintenance applications specifically targeted to engine condition monitoring sensors. The device will be able to generate up to 10 mW of DC power foronline sensors and wireless CBM network nodes in the vicinity of a diesel engine. The device will scavenge energy from the intrinsic vibrations in the engine and have the ability to tune itself for optimal power output at any engine speed. A novelelectrical generator based on a mechanical resonator will be developed that produces power via electromagnetic induction. Initial calculations show that a 10 mW generator can be built within a 2.5  2.5  0.5 cm3 enclosure. Additional spaceof comparable size is required for up to 10 J of energy storage and power conditioning electronics. The phase I program will investigate the vibration spectrum of diesel engines and design the resonator system to exploit existing vibration energy sourceswith a goal of producing 5 mW of DC power and store 5 J. Phase II will expand the development of the energy scavenger, upgrade the design to produce 10 mW and develop the processes necessary for limited manufacture and field testing. (P-020234) The proposed energy scavenging system will enable autonomous operation of engine condition-based monitoring and data transmission systems and reduce the complexity of under-hood power distribution.