The new harvester can amplify power generated from human walking vibrations by about 90 times while remaining as small as conventional harvesters.
CREDIT: Yoshimura, Osaka Metropolitan University
New harvester amplifies electric power generated from human walking motion by about 90 times
Walking can boost not only your own energy but also, potentially, the energy of your wearable electronic devices. Osaka Metropolitan University scientists made a significant advance toward self-charging wearable devices with their invention of a dynamic magnifier-enhanced piezoelectric vibration energy harvester that can amplify power generated from impulsive vibrations, such as from human walking, by about 90 times, while remaining as small as currently developed energy harvesters. The results were published in Applied Physics Letters.
These days, people carry multiple electronic devices such as smartphones, and wearable devices are expected to become increasingly widespread in the near future. The resulting demand for more efficient recharging of these devices has increased the attention paid to energy harvesting, a technology that converts energy such as heat and light into electricity that can power small devices. One form of energy harvesting called vibration energy harvesting is deemed highly practical given that it can transform the kinetic energy from vibration into electricity and is not affected by weather or climate.
A research team led by Associate Professor Takeshi Yoshimura from the Graduate School of Engineering at Osaka Metropolitan University has developed a microelectromechanical system (MEMS) piezoelectric vibration energy harvester that is only approximately 2 cm in diameter with a U-shaped metal component called a dynamic magnifier. Compared with conventional harvesters, the new harvester allows for an increase of about 90 times in the power converted from impulsive vibrations, which can be generated by human walking motion.
The team has been working on developing vibration energy harvesters that utilize the piezoelectric effect, a phenomenon in which specific types of materials produce an electric charge or voltage in response to applied pressure. So far, they have succeeded in generating microwatt-level electricity from mechanical vibrations with a constant frequency, such as those generated by motors and washing machines. However, the power generation of these harvesters drops drastically when the applied vibrations are nonstationary and impulsive, such as those generated by human walking.
Responding to this challenge, the team developed and incorporated the U-shaped vibration amplification component under the harvester. The component allowed for improvement in power generation without increasing the device size. The technology is expected to generate electric power from non-steady vibrations, including walking motion, in order to power small wearable devices such as smartphones and wireless earphones.
Professor Yoshimura concluded, “Since electronic devices are expected to become more energy-efficient, we hope that this invention will contribute to the realization of self-charging wearable devices.”
More from: Osaka Metropolitan University
The Latest Updates from Bing News
Go deeper with Bing News on:
Vibration energy harvester
- New Harvester Powers IoT Sensors With Everyday Waste Energy
Energy harvesting is the process of obtaining electrical energy from common energy sources such as heat, vibration, light, and electromagnetic waves from places like factories and cars. Today's ...
- MIT’s breakthrough self-powered sensor harvests energy from the air
The battery-free, energy-harvesting sensor could also have implications ... He says that measuring the vibration of a pump, for example, could provide real-time information on the health of ...
- Evaluating the “Power” of Energy Harvesting
But it operates on a significantly smaller scale. Energy harvesting is the process of capturing light, heat, vibrations, radio, or other sources of energy in the environment and converting it into ...
- What are nanogenerators? Explaining their types, applications, and potential
This characteristic makes them suitable for applications in energy harvesting from various sources, such as vibrations, human motion, and fluid flow. Examples include piezoelectric nanogenerators for ...
- Energy Harvesting Generators and Transducers Information
The primary function of energy harvesting generators and transducers is to generate electricity from nonstandard sources such as vibrations, thermal differences, and photonic sources. These products ...
Go deeper with Bing News on:
Self-charging wearable devices
- Apple’s Magnetic Charging Dock for the Apple Watch is 56% off today
The Apple Watch Magnetic Charging Dock, originally priced at $79, is down to a very affordable $35 from Amazon's Woot, but you have to hurry with your purchase.
- PSiFI: Wearable device interprets emotions of people near you
This development from Professor Jiyun Kim and his team from the Department of Material Science and Engineering at UNIST is set to transform a variety of sectors by integrating emotion-based services ...
- World’s first real-time wearable human emotion recognition technology developed!
The technology is based on the phenomenon of “friction charging,” where objects separate into positive and negative charges upon friction. Notably, the system is self-generating, requiring no ...
- Researchers Develop Real-Time Emotion Recognition Wearable Tech: Here's How It Works
Researchers at the Ulsan National Institute of Science and Technology ... of "friction charging." When in use, the system separates positive and negative charges via friction, eliminating the need for ...
- Real-time wearable human emotion recognition technology developed
This innovative technology is poised to revolutionize various industries, including next-generation wearable ... of "friction charging," where objects separate into positive and negative charges upon ...