Abstract
Engine health monitoring is very important to maintain the life of engines, and the power supply to sensor nodes is a key issue that needs to be solved. The piezoelectric vibration energy harvester has attracted much attention due to its obvious advantages in configuration, electromechanical conversion efficiency, and output power. However, the narrow bandwidth has restricted its practical application. A self-powered engine health monitoring system was proposed in this paper, and an L-shaped wideband piezoelectric energy harvester was designed and implemented. The L-shaped beam-mass structure and the piezoelectric bimorph cantilever beam structure was combined to form the wideband piezoelectric energy harvester configuration, which realized effective output at both resonance points. The theoretical model and finite element simulation analysis of the wideband piezoelectric energy harvester were proposed and the parameters were optimized based on that to meet the requirement of the vibration frequency of the engine. The experimental results show that the proposed energy harvester can be applied into the automobile engine health monitoring system. Engine signal analysis results also demonstrate that the proposed system can be used for engine health monitoring.
Highlights
As the most common power mechanical equipment, engines are widely used for automobiles, ships and aviation aircraft
Due to the batteries needing to be replaced or charged periodically, which increases difficulty of maintenance, finding a non-battery power supply way for the wireless acceleration nodes is a key issue to push the application of the engine health monitoring technique
This study proposed the entire system from power supply to data transmission, and the experimental results showed that the piezoelectric energy harvester could support the system
Summary
As the most common power mechanical equipment, engines are widely used for automobiles, ships and aviation aircraft. In [14], a novel piezoelectric harvester-based self-powered adaptive circuit with wireless data transmission capability for structural health monitoring is presented. The circuit can work with different piezoelectric ceramic transducers (PZT) and different load conditions and is able to accomplish the maximum power transferred condition along different amplitudes and frequencies of oscillations of the PZT. Few of these works were designed based on actual application scenarios. This paper aims to provide a self-powered solving plan for the engine health monitoring and explore the bandwidth expansion technology of the piezoelectric energy harvesters aiming at the wideband engine vibration. The test experiment system was set up and implemented and the analysis results of the signals were provided
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