A Linear actuator based on cilia vibration
Date Issued
2015
Date
2015
Author(s)
Wang, Chun-You
Abstract
Actuators based on vibration are typically found in ultrasonic motors and part feeder. The former can generate a fairly large torque and a high energy density; however, specific mechanisms such as belt drives or motion guides are necessary for the movement of objects that have various shapes. The latter is not that convenient for engineering application due to the driving force which is dominated by the mass of the objects and the friction coefficient. An easy way to assemble linear actuator has been developed by utilizing the vibration of angled thin short fibers—cilia vibration (CV). The actuator consists of a cantilever beam made of PVDF piezo film and Velcro cilia. The cilia array is made of nylon fiber bounded with a plastic resin and angled to the object so that it has directional flexure and anisotropic friction. When the cantilever beam vibrates, a standing-up and falling-down motion of the cilia linearly drives objects out of two plates, realizing a linear movement. A theoretical model for the actuator based on geometry of the device is established. A maximum driving speed of 4 mm/s occurs at 300 Hz which is the nature frequency of the device. And the driving force is theoretically calculated as 1.6 μm which were obtained at the vibration frequency of 300 Hz. Also, a prototype of the CV actuator was developed. The prototype is made of acrylic plate fabricated by laser cutting machine. A box-tunnel like shape, two holders and a latch fit bottom constitute the device and make it easy to assemble and for observation.
Subjects
linear actuator
cilia
cantilever beam
nature frequency
piezoelectric film
Type
thesis
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