Table 2. Resonance Frequency, Displacement of Center Point, and Voltage Output as a Function of Device Diameter in Random and Aligned Fibers.

	circle diameter (mm)	resonance frequency (Hz)	displacement (μm)	voltage output (mV)
random fibers	30	140	240	17
	20	167	133	8
	16	302	120	5
	10	330	76	1
aligned fibers	30	186	78	10
	20	222	45	5
	16	230	11	3
	10	220	9	3