激励频率自适应的采煤机状态压电俘能监测装置研究

考虑到目前用于采煤机状态监测的压电俘能装置不能实时根据外界激励频率变化而改变固有频率,研究一种自适应外界激励频率的采煤机状态压电俘能监测装置.对该频率可调的压电俘能装置进行数学模型建立、固有频率的有限元仿真以及实验研究.研究结果表明:随着压电俘能装置悬臂梁重心的变化,压电俘能装置发电量最大值对应的激励频率不断变化.自适应外界激励频率的压电俘能装置可将频率变化范围控制在7 Hz到55 Hz之间.自适应外界激励频率的压电俘能装置可使安装于采煤机各处的压电俘能装置输出功率在300 mW左右.自适应外界激励频率的压电俘能装置能够对采煤机工作时不同位置的激励频率进行自适应调节,保持对监测装置稳定供电.

State coal mining machine excitation frequency adaptive piezoelectric energy harvesting device of monitoring

Considering that piezoelectric energy harvesting device used for state monitoring of shearer could not change natural frequency in real-time according to changes of external excitation frequency,a king of piezoelectric energy har-vesting device for state monitoring of shearer adaptive to external excitation frequency was studied. Mathematical model establishment,finite element simulation of natural frequency and experimental study were conducted on piezoe-lectric energy harvesting device with adjustable frequency. Results showed that:with focus changes of cantilever beam of piezoelectric energy harvesting device,excitation frequency corresponding to maximum of power generation of piezo-electric energy harvesting device changed constantly. Piezoelectric energy harvesting device adaptive to external exci-tation frequency could control frequency range from 7 Hz to 55 Hz. Output power of various piezoelectric energy har-vesting devices installed anywhere of shearer could be about 300 mW by piezoelectric energy harvesting device adap-tive to external excitation frequency. Piezoelectric energy harvesting device adaptive to external excitation frequency could adjust excitation frequency at different positions when shearers were under operation to keep stable power supply for monitoring device.