壓電振子應用於能量擷取與滾珠軸承損壞檢測之研究

Abstract

本論文提出了一種能夠從旋轉式徑向週期性磁力收集能量的壓電感測器，此裝置可藉由量測到的電壓變化來區分健康與損壞軸承，因此可應用於軸承健康檢測。此裝置由固定在軸承座上並連接到標準介面電路的壓電懸臂樑組成，懸臂樑末端的磁鐵被固定在負載上旋轉的磁鐵沿徑向激振。當旋轉機械中的滾珠軸承出現損壞時，會產生隨機晃動，導致磁激振作用力產生變化，因此可藉由量測出的振動訊號判斷壓電片輸出電壓的變化。結果顯示，當軸承故障時，量測出的頻率響應輸出功率值會低於在健康軸承下量測到的輸出功率值，因此可判斷對應的軸承是否損壞。未來將建置訊號傳送模組取代外部振動訊號量測，達到一完整自供電壓電感測器。

The paper proposes a piezoelectric device which is capable of harvesting energy from the radial direction of rotary magnetic plucking. This device is able to distinguish between the healthy and faulty ball bearings by measuring the change of piezoelectric voltage. Indeed, the device consists of a piezoelectric cantilever beam attached to the standard interface circuit. Its tip magnet is excited along the radial direction by a rotating magnet affixed to the fly wheel. The interaction between these two magnets is perturbed due to the induced excitation by the faulty bearing, giving rise to the change of the output voltage. The result shows that the voltage frequency response in the case of the faulty bearing is typically smaller than that of the healthy bearing. Thus, the diagnosis of the healthy bearing can be achieved by detecting the change of output voltage. Finally, a module used for sending voltage readings to a smartphone intermittently will be setup in the near future. The outcome of it is the development of a self-powered sensor for the health monitoring of bearings.