压电悬臂梁能量收集及减振研究

根据压电悬臂梁和悬臂梁-质量块振子的理论模型,针对船舶柴油机多振源、高频振动等特点,提出了一种集压电集能和减振降噪两种功能协调工作的多压电悬臂梁装置。运用COMSOL有限元分析软件建立了带质量块的多悬臂梁仿真模型。有限元仿真分析结果表明:压电悬臂梁结构振动频率接近柴油机固有频率时产生共振,振动由柴油机转移到悬臂梁装置,柴油机振动情况明显减少,压电片输出电压和功率分别为5. 88 V和3. 46 m W。压电悬臂梁减振降噪和压电能量收集实验得出:悬臂梁与振动源在频率18 Hz发生共振,振幅由19. 49 d B减少到2. 41 d B,压电片最大的输出电压约为5. 92V,集能效果和减振都较为明显。

Study of Piezoelectric Cantilever Beam in Vibration and Noise Reduction and Energy Gathering

Based on the theoretical models of piezoelectric cantilever beam and cantilever beam-mass block vibrator, and in view of the characteristics of marine diesel engine such as multi-vibration source and high-frequency vibration, a kind of multi-piezoelectric cantilever beam device is proposed, which combines the functions of piezoelectric energy gathering and vibration reduction and noise reduction. The simulation model of multi-cantilever beam with mass block was established by using COMSOL finite element analysis (FEA) software. The FEA simulation results showed that the vibration frequency of piezoelectric cantilever beam structure was close to the natural frequency of diesel engine, and the vibration was transferred from diesel engine to cantilever beam device, and the vibration of diesel engine was obviously reduced. The output voltage and power were 5.88 V and 3.46 mW respectively. Vibration and noise reduction of piezoelectric cantilever beam and piezoelectric energy collection experiments show that the cantilever beam resonates with the vibration source at the frequency 18 Hz, the amplitude is reduced from 19.49 dB to 2.41 dB, and the maximum output voltage of the piezoelectric plate is about 5.92 V. The effect of energy collection and vibration reduction are obvious.