This thesis presents a coupled mechanical device that generates power by a direct conversion of the airflow into mechanical vibrations. The mechanism experiences a fluid force that changes with its orientation causing vibrations. The device consists of two tightly coupled parts: a mechanical resonator that produces high-frequency mechanical oscillations from quasi-steady airflow resulting in large amplitude vibrations and a piezoelectric power generator harvesting the energy from the resonatoru27s motion. Instantaneous velocity interactions were studied using numerical modeling and experimental tests. The proposed energy harvester allows for locking up the deviceu27s lowest natural frequency to the vortex-shedding resonant frequency induced by the ambient energy source. Furthermore, an array consisting of 8 harvesters was constructed and a net feasible power output was measured. A single energy harvester vibrating at its first Eigen frequency mode demonstrated a peak-to-peak output voltage of over 80V at 10Hz, from an input wind velocity of ~7 m/s.
展开▼
机译：本文提出了一种耦合的机械装置，该装置通过将气流直接转换为机械振动来发电。该机构会受到流体力的影响，该流体力会随着其方向变化而引起振动。该设备由两个紧密耦合的部分组成：一个机械谐振器，该谐振器从准稳定气流中产生高频机械振荡，从而导致大幅度的振动，而压电发电机则从谐振器的运动中获取能量。使用数值模型和实验测试研究了瞬时速度相互作用。拟议中的能量收集器可以将设备的最低固有频率锁定到由环境能量源诱发的涡流消除共振频率。此外，构建了由8个收割机组成的阵列，并测量了净可行功率输出。单个能量采集器以其第一个本征频率模式振动，在约7 m / s的输入风速下，以10Hz的频率显示峰峰值输出电压超过80V。
展开▼
