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Environmental temperature is essential for security monitoring and controlled areas, such as chemicals factory and Inflammable goods vehicle, in which WSN is the most appropriate choice for intelligent monitoring purpose. In this work, we design a piezoelectric energy harvester to collect low-acceleration (<0.5 g) and low-frequency (<50 Hz) vibration energy for powering wireless sensor network...
Current calibration for high-g accelerometer is mainly based on Hopkinson bar trail. On practical application, we found that there are deviations between calibrated results and the response of an accelerometer. In this work, relevant experiments are designed to verify this deviation. A method for compensating the results obtained by shock excitation with short duration was proposed, which is expected...
Molecular dynamics simulations based on reactive empirical bond-order potentials were conducted to investigate the bending and vibration of defect-free and defective monolayer MoS2. The effects of constrained boundary conditions and single sulfur point vacancies were concerned. Three types of boundary conditions were discussed in our work, including the simply supported boundary, the pinned-pinned...
A design scheme of piezoelectric MEMS vibration platform for in-situ self-calibration of accelerometer is proposed in this paper. On the basis of theoretical deduction, the available g-factor of the vibration platform is analyzed. Taking fabrication limitations into consideration, the characteristics optimization of the vibration platform using PZT-4 is carried out by evaluating the impact on performance...
This paper reports a new hybrid energy harvesting approach which combines triboelectricity and piezoelectricity based on low-frequency (less than 5 Hz, such as environmental vibrations) stochastic resonance. A vibration configuration was well designed to enhance the conversion efficiency of mechanical energy to electricity via the stochastic vibration mechanism. Furthermore, the electric output performance...
This paper presents a new method to monitor the micro-stamping procedures by collecting the acoustic vibration signals via low-cost MEMS microphones. A MEMS microphone is directly mounted on the punching mold for detecting the acoustic signals of the stamping procedure. The small stamping signals are conducted via the metal molds such that the levels for signal attenuation and background noise can...
This paper demonstrates a hybrid converter, which, for the first time, combines both the piezoelectric and the electromagnetic mechanisms in a ball-impact structure. The converter can harvest low-frequency vibration energy with an external power and has been proven to work in an environment with the ambient vibration frequency under 10Hz.
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