摘要 : Scavenging irregular energy from various environmental impacts has gained great attentions. In this paper, an impact energy harvesting system with a mechanical vibration frequency stabilizer (MVFS) is proposed and evaluated. The M... 展开 Scavenging irregular energy from various environmental impacts has gained great attentions. In this paper, an impact energy harvesting system with a mechanical vibration frequency stabilizer (MVFS) is proposed and evaluated. The MVFS, constructed with a spiral spring and a series of gear sets, can store the short-duration irregular energy, and then stably release it to excite a piezoelectric cantilever with a regular frequency. Torque equations are constructed to analyze the energy transmitting process, and the parameters correlating with the vibration frequency of cantilever. A lab-scale prototype with a dimension of 6.0 x 3.0 x 5.2 cm(3) is fabricated and tested. The experimental results demonstrate that the proposed MVFS can realize a frequency stabilization within 33% for the output voltage when the frequency of impact input changes by 436%. This system concept features good compatibility for powering wireless sensor nodes with the impact energy from roads, railways, offices and sports fields. 收起