Self-Powered Wireless Temperature and Vibration Monitoring System by Weak Vibrational Energy for Industrial Internet of Things

Developing self-powered smart wireless sensor networksby harvestingindustrial environmental weak vibration energy remains a challengeand an impending need for enabling the widespread rollout of the industrialinternet of things (IIoT). This work reports a self-powered wirelesstemperature and vibration monitoring system (WTVMS) based on a vibrationaltriboelectric nanogenerator (V-TENG) and a piezoelectric nanogenerator(PENG) for weak vibration energy collection and information sensing.Therein, the V-TENG can scavenge weak vibration energy down to 80 & mu;m to power the system through a power management module, whilethe PENG is able to supply the frequency signal to the system by acomparison circuit. In an industrial vibration environment where thevibration frequency and amplitude are 20 Hz and 100 & mu;m, respectively,the WTVMS can upload temperature and frequency information on theequipment to the cloud in combination with the narrowband IoT technologyto realize real-time information monitoring. Furthermore, the WTVMScan work continuously for more than 2 months, during which the V-TENGcan operate up to 100 million cycles, achieving ultrahigh stabilityand durability. By integrating weak vibration energy harvesting andactive sensing technology, the WTVMS can be used for real-time onlinemonitoring and early fault diagnosis of vibration equipment, whichhas great application prospects in industrial production, machinerymanufacturing, traffic transportation, and intelligent IIoT.