Regenerative dampers for vehicle suspension systems that can harvest power at low frequencies efficiently are challenging to realise. To increase their energy harvesting efficiency, a type of high volumetric Figure of Merit magnetoelectric regenerative damper is proposed. To increase the magnetic linkage gradient of its coil in the moving direction and in its motion region, lumped parameter equivalent magnetic circuit model is adopted in its magnetic structural parameter optimization. Finite element analysis is then used to verify the analytical model and theoretical results. Finally, 3 prototypes with different parametric combinations are manufactured and fabricated to do experiments. The experiments indicate that the optimised megnetoelectric regenerative damper can harvest vibration power of 16.3 watts and provide an adjustable damping coefficient that can reach 1605Ns/m when the damper in a relative velocity of 0.2m/s. The corresponding volumetric Figure of Merit can reach 8.3%, which is higher than most of the works presented in recent literatures. This type of regenerative damper can be used in vehicle suspension systems and meet their requirements. It also offers the opportunity to be applied in semi-active vehicle suspensions.
To supply power to wireless sensor networks, a type of broadband electromagnetic vibration energy harvester (VEH) using bistable vibration scavenging structure is proposed. It consists of a planar spring, an electromagnetic transducer with an annular magnetic circuit, and a coil assembly with a ferrite bobbin inside. A nonlinear magnetic force respecting to the relative displacement is generated by the ferrite bobbin, and to broaden the working frequency bandwidth of the VEH. Moreover, the ferrite bobbin increases the magnetic flux linkage gradient of the coil assembly in its moving region, and further to improve its output voltage. The dynamic behaviors of the VEH are analyzed and predicted by finite element analysis and ODE calculation. Validation experiments are carried out and show that the VEH can harvest high energy in a relatively wide excitation frequency band. The further test shows that the load power of the VEH with a load resistor of 90Ω can reach 10mW level in a wide frequency bandwidth when the acceleration level of the harmonic excitation is 1g. It can ensure the intermittent work of many sensors as well as wireless communication modules at least.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.