Studies have reported that propagating waves can be generated in a finite one-dimensional structure by using two piezoelectric actuators. However it is not easy to generate stable and continuous propagating waves due to the finite boundaries. Driving two piezoelectric actuators at two different locations with sinusoidal signals of 90° phase difference, the propagating waves can be generated on a one-dimensional structure. However, the correlation between the actuators and propagating waves is still not clear. In this paper, we adopt shadow Moiré technique to monitor the full-field out-of-plane deformation response of the generated propagating waves in the one-dimensional (1-D) plate with 180 mm in length. A 200-μm-pitch grating was used in this moiré interferometry setup. The moiré fringe images were captured by a high dynamic camera sequentially. Moiré fringes were analyzed by regions of interested (ROI) capturing technique and Fourier transform to retrieve phase information, which included 1-D plate deformation. After the phase was unwrapped and filtered, the instantaneous surface profile was reconstructed. Our experimental results demonstrated that our system can capture propagating waves generated by using the second (60.025 Hz) and the third (109.500 Hz) resonant modes.
Piezoelectric motor is based on generating traveling waves on a finite structure. It can be classified into linear and
rotary types. Among them, linear motors have an inevitable problem since finite boundaries are always exist, and reflected
waves can hinder the formation of propagating waves. To solve this problem, a linear motor based on a single driving
frequency and two induced resonant molds are previously reported. However, the driving frequencies are not at structure
resonant frequency, the efficiency of linear motor is based on the superposition of two adjacent bending modes. The
traveling wave is created by two piezoelectric actuators driven by a single frequency in between these two resonant molds
with a 90° phase difference. Based on previous report, it shows that by placing these two 0.178/L length actuators at 0.22/L
and 0.78/L on a one-dimensional beam with length L, an optimal performance could be reached. It suggested that the
location and size of the two piezoelectric actuators can be used to optimize the performance of the linear motor. In this
study, finite element simulation was used to study the contributions of the temporal and spatial correlations between the
two actuators with respect to a 1-D linear motor. The position and size of these two piezoelectric actuators are studied for
optimizing the performance of the linear motor.
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