This study proposes a double elastic steel sheet vibration energy harvester system (DESS VEH), where the vibration generated by the deformation and/or clap of two magnetic excited elastic steel sheets is assisted by a piezo-patch to generate electric energy. The proposed model can be applied on an unmanned helicopterany other multi-rotor drones. The downstream flows from the rotors are collecteddriving a wind-turbine to excite the vibration steel sheet(s) systemgenerating electric power.

This technology develops a high-efficiency whole-body vertical vibration system, which includes a high-power factor correction circuit, a 2-switch forward converter, a full-bridge inverter realized by a micro-controller. The developed application products can generate alternating sine-wave waveform of different frequenciesamplitudes to the electromagnet coils to generate vertical vibration force, thereby achieving the effect of high power factoraccelerated motion. Different frequenciesamplitude voltages can achieve different vibration body positionvibration strength.

Here, we develop a comfortable dental headpiece with aerosol reduction function as shown in Figure 3. This can not only help reduce the air pollution, but also reduce noisevibration, enabling future dental treatment to be safermore pleasant. Air curtain are traditionally used to contain pollutants in large area, here we used the air curtain technology to contain air pollutants in a small area at the sourceadded negative ions to remove air pollutants within. This technology can also be applied to other handheld tool that emits air pollution.