Energy harvesting technology based on smart piezoelectric materials still faces the challenge of expanding bandwidth and increasing frequency bands of harvesters. In response to this challenge, a magnetically excited piezoelectric harvester with nonlinear energy sink is proposed. This work establishes a nonlinear magnetic force model for the magnetic rotor and auxiliary magnets. The electromechanical coupling equations for the harvesting system are formulated based on Newton’s and Kirchhoff’s laws, and their applicability is verified by experiments. The numerical calculation method is employed to analyze the effects of the magnetic rotor types and the main position parameters of the auxiliary magnets on the performances. The analysis results show that a single piezoelectric oscillator can have multiple working frequency bands due to the special form of the force exerted by the alternating magnetic excitation; the nonlinear energy sink enhances the oscillation deflection at low speeds; the position parameters of the auxiliary magnets can adjust the band width between the power peaks and improve the power. In the laboratory tests, the harvester lit up 67 LEDs and power for a Bluetooth temperature and humidity sensor at 170 rpm. The mobile terminal received the monitoring data transmitted by the sensor, realizing the self-powering function of wireless sensors.

中文翻译：

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具有非线性能量阱的磁励磁宽带旋转压电能量收集器：理论研究和实验验证


基于智能压电材料的能量收集技术仍然面临着扩大采集器带宽和增加频段的挑战。为了应对这一挑战，该文提出了一种具有非线性能量吸收的磁励磁压电采集器。这项工作建立了磁转子和辅助磁体的非线性磁力模型。根据牛顿定律和基尔霍夫定律制定了收获系统的机电耦合方程，并通过实验验证了其适用性。采用数值计算方法分析了磁转子类型和辅助磁体的主要位置参数对性能的影响。分析结果表明，由于交变磁激励施加的力的特殊形式，单个压电振荡器可以具有多个工作频段;非线性能量汇增强了低速时的振荡偏转;辅助磁体的位置参数可以调整功率峰值之间的带宽，提高功率。在实验室测试中，收割机点亮了 67 个 LED，并以 170 rpm 的速度为蓝牙温度和湿度传感器供电。移动终端接收到传感器传输的监控数据，实现了无线传感器的自供电功能。