Energy Harvesting & Design Optimization Laboratory, UMBC Department of Mechanical Engineering University of Maryland, Baltimore County Mechanical Motion Conversion from Reciprocating Translation to One-Directional Rotation for Effective Energy Harvesting Kabir Ahmed a , Soobum Lee a a Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD, USA 21250-0001
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Energy Harvesting & Design Optimization Laboratory, UMBC
Department of Mechanical Engineering
University of Maryland, Baltimore County
Mechanical Motion Conversion from
Reciprocating Translation to One-Directional
Rotation for Effective Energy Harvesting
Kabir Ahmeda, Soobum Leea
aDepartment of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle,
Baltimore, MD, USA 21250-0001
1/19
Outline
Literature survey on Energy Harvesting Buoy
Our Idea
Prototyping
Power Estimation Study
Conclusion
Future Works
2/19
Motivation
A large scale buoy can potentially replace 10% of world electricity demand
Buoy generators can conceivably produce power more cheaply than coal (4.5 cents/kWh), currently the cheapest source of energy
3/19
Methods
Wave motion rotational movement
Hydraulic pressure (water flow) to actuate hydraulic motors
or turbine
Wave motion translational movement
Linear generator: utilizing electric coil and magnetic shaft for
producing electric current
Use of dielectric elastomer
4/19
Previous Work
Linear generators
Permanent magnet linear
generator buoy, Rhinefrank, K. et
al. (USA, 2006)
Ocean Wave Energy Harvesting
Buoy for Sensors (2009)
•Utilization of singular anchored linear
generators
•Simplifies the overall mechanical
design and the device experiences low
mechanical wear
•Eliminating the complex and inefficient
process of converting the linear thrust
of the waves to rotational torque
5/19
Previous Work
Pelamis (2008), UK
As the waves move the joints up and down, hydraulic rams
move according to them, pumping high pressure oil to
hydraulic motors which drive electric generators
Near shore devices
•Agucadoura Wave Farm (Portugal)
http://www.pelamiswave.com/
6/19
Previous Work
Ocean Power Technologies (OPT)
The rising and falling of the waves offshore causes the buoy
to move freely up and down
The resultant mechanical stroking drives a rotational
electrical generator
http://www.oceanpowertechnologies.com/
7/19
Our Idea
The buoy motion dependent of
wave motion (by airbag or float)
The reciprocating translational
motion from wave generates
one directional rotational
motion
No need of rectification to convert
VAC to VDC
8/19
Implementation
Practical application of motion conversion concept
Linear rail and carriage provides the translational motion
The motor would utilize the rotational motion, by means of
pulleys to convert from translation to rotation
In order to ensure unidirectional rotation, a pair of clutches