Browsing by Subject "Piezoelectric actuator"

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Open Access
Design and characterization of a micro mechanical test device
(2016-08) Altıntepe, Elif
Devices with micro- and nano- scale components are becoming more commonplace and demand for better quantification of the properties such as Young's modulus, stiffness, and damping of small-scale components is increasing. Since these properties can differ significantly from their bulk values, their direct measurements using a micro mechanical test device is offered in the thesis. The micro-scale test device described in this thesis consists of a platform that also includes subsystems to measure stress and strain, actuation, sample fabrication and grippers to mount the samples. A notch- exure based monolithic structure is used for the device platform to provide high-resolution precise motion. A piezoelectric actuator, a force transducer, and a vibrometer are used for actuation, force measurement and velocity measurement, respectively. Finite element analyses and experiments are carried out in order to characterize the apparatus as a micro mechanical test device. Static, time-dependent cases are analyzed and its eigenfrequencies are determined. Required calibrations and drift analysis of instruments are conducted. Force and velocity relations are obtained, and results are evaluated for linearity and repeatability. Finally, operating range of proposed device is determined for use as a micro mechanical test device.
Open Access
Static and dynamic deformation response of smart laminated composite plates induced by inclined piezoelectric actuators
(SAGE, 2022) Gohari, Soheil; Mozafari, Farzin; Moslemi, Navid; Mouloodi, Saeed; Alebrahim, Reza; Ahmed, Mizan; Abdi, Behzad; Sudin, Izman; Burvill, Colin
A Levi-type analytical solution procedure is developed to characterize static and dynamic deformation response of smart laminated simply-supported composite rectangular plates induced by inclined piezoelectric actuators under (1) constant electrical voltage and (2) time-dependent electrical voltage with excitation frequency. The key to development of this analytical solution is to employ higher order finite integral transform and discretized higher order partial differential unit step function equations. Unlike earlier studies, this research aims to investigate the effect of inclination angle of piezo electric actuators on static and dynamic deformation response of laminated composite plates under both static and dynamic conditions. The developed analytical solution procedure is implemented computationally through Matlab-based computer code. Its accuracy is initially investigated through convergence study and results comparison with the published literature for a particular case when inclination angle is θ = 0°, which is only limited to bending deformation response. Since there is no published benchmark data for twisting deformation response analysis caused by inclination angle of piezoelectric actuators (θ ≠ 0°), a set of robust and realistic numerical analysis using Abaqus finite element analysis (FEA) is conducted. Good agreement between the analytical and numerical results is observed. Unlike applied electrical voltage, inclination angle of a piezoelectric actuator does not have a significant impact on twisting deformation response during static mode; whereas, both the excitation frequency and inclination angle can significantly influence maximum amplitude of vibration.