摘要
本研究主要為設計行進波式線性致動器，利用兩個蘭杰文型壓電振動子(Langevin vibrator)壓電振動子作為激振源，其中一振動子作為波產生器，另ㄧ振動子為波吸收器，且振幅相同。因振動時所產生的行進波傳遞於導軌上其表面伴隨著質點橢圓軌跡運動現象，因此可用此原理以驅動置於上方之滑台。研究中主要探討方向為提升滑台的傳輸速度(約500mm/s)。經由行進波原理探討得知驅動頻率為影響速度的主因之一。利用ANSYS有限元素分析軟體來設計振動子，經實驗與分析比較，其振動子製作誤差約3%。將此線性致動器與系統整合後，驅動致動器使滑台移動速度可達466mm/s。另建立致動器接觸層之數學模式探討得知其損耗原因有摩擦力、接觸時所給予的預應力以及材料特性等，經實驗驗證相當接近，數模推導之誤差約6%，可作為修正致動器轉換效率之重要參考依據，以改善運用行進波式線性致動器驅動之系統傳輸效能。
並列摘要
By use of a pair of Langevin vibrators and by use of associated rail and slide, a linear actuator is developed. One of the Langevin vibrators performs as a vibrator and the other one performs as an absorber. Besides the Langevin vibrator, design of the waveguide and the slider are included in this article. Also, the generated traveling wave and the transmission loss due to friction and contact pressure and so on are studied. The vibration wave generated by the vibrators is simulated by ANSYS and measured in experiment. Experimental data shows that both are approximate and with error of about 3%. Similarly, the slider output of the developed linear actuator system by use of Langevin vibrators is tested that can reach the speed of about 466 mm/sec. Since the transmission loss is significant, except the manufacturing and assembly errors, the cause and effect as well as how to increase the efficiency to transfer more energy into the slider is investigated. Modeling of transmission loss is derived including the factors of friction and contact pressure and material property. It is seen that by adjusting these parameters, the transmission loss can be reduced; in other words, the speed and force output of the slider can be increased. It is believed the model of transmission is useful for understanding the energy transfer of the traveling wave to the driven mechanism, and it provides a design index for similar actuator design by use of traveling wave.