This paper reports the development and implementation of an energy aware autonomous wireless condition monitoring sensor system (ACMS) powered by ambient vibrations. An electromagnetic (EM) generator has been designed to harvest sufficient energy to power a radio-frequency (RF) linked accelerometer-based sensor system. The ACMS is energy aware and will adjust the measurement/transmit duty cycle according to the available energy; this is typically every 3 s at 0.6 m s?2 rms acceleration and can be as low as 0.2 m s?2 rms with a duty cycle around 12 min. The EM generator has a volume of only 150 mm3 producing an average power of 58 ?W at 0.6m s?2 rms acceleration at a frequency of 52 Hz. In addition, a voltage multiplier circuit is shown to increase the electrical damping compared to a purely resistive load; this allows for an average power of 120 ?W to be generated at 1.7 m s?2 rms acceleration. The ACMS has been successfully demonstrated on an industrial air compressor and an office air conditioning unit, continuously monitoring vibration levels and thereby simulating a typical condition monitoring application
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机译:本文报告了由环境振动驱动的能量感知型自主无线状态监测传感器系统(ACMS)的开发和实现。电磁(EM)发生器已被设计为收集足够的能量,以为基于射频(RF)链接的基于加速度计的传感器系统供电。 ACMS具有能量意识,并将根据可用能量调整测量/发射占空比;通常在0.6 m s?2 rms的加速度下每3 s发生一次,并且占空比大约为12分钟时可以低至0.2 m s?2 rms。 EM发电机的体积仅为150 mm3,在0.6m s?2 rms的加速度下,以52 Hz的频率产生的平均功率为58?W。此外,还显示了一个电压倍增电路,与纯电阻负载相比,它可以增加电阻尼。这允许在1.7 m s?2 rms的加速度下产生120?W的平均功率。 ACMS已在工业空气压缩机和办公室空调单元上成功演示,可连续监测振动水平,从而模拟典型的状态监测应用
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