English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Maximum output powers of vibration-driven inertial power harvesters reportedin literature exhibit sizable variations, even when normalized by the deviceweight or their maximum linear size. To help establish a common benchmark, wepresent a power-spectral-density based approach for estimating the maximumpower that can be obtained using a resonant inertial power harvester from arandom (aperiodic) vibration source with a given power spectral density. In thesimplest case of unlimited harvester size, the maximum obtainable power issimply proportional to the maximum value of the power spectral density ofvibration acceleration. We describe in detail the underlying theory and thepractical method for evaluating these limits. We also present a simpleanalytical formula to estimate the minimum harvester size required forobtaining the maximum possible power. Specific power limits are derived asfunction of harvester size for three practical examples of vibration sources:(a) pneumatic power tool, (b) the body of an idling Mazda RX7 sports car, and(c) human walking motion. Characteristic power spectra and optimum designparameters (quality factor and resonant frequency) are presented for bothtranslational and rotational harvesters. Translational harvesters generallyoutperform rotational ones for realistic harvester sizes, with the power toolvibrations yielding a practical power limit of ~300 mW per gram of inertialmass, followed by walking at ~1mW/g, while the vibrations of a car body yield~0.1 mW/g or less.

Limits to inertial vibration power harvesting: power-spectral-density approach and its applications