In recent years, micropumps have been investigated by various researchers as drug delivery and disease diagnostic devices. Many of these micropumps have been designed, considering available micro fabrication technologies rather than appropriate pump performance analysis. Piezoelectric based micro pumps are more popular as compared to other smart materials being explored. In this paper, four segment piezoelectric bimorph actuator (FSPB) are compared with circular disc piezoelectric bimorph actuator (CDPB) based pump. The static and transient behaviors under various electric fields have been analyzed by using ANSYS 12.1(R) finite element software. Simulation results show that dividing the actuator in segment can amplify the deflection and improve the performance of the pump.
In the present study an attempt has been made to identify various bearing faults using machine learning algorithm.
Vibration signals obtained from faults in inner race, outer race, rolling element and combined faults are considered. Raw
vibration signal cannot be used directly since vibration signals are masked by noise. To overcome this difficulty
combined time frequency domain method such as wavelet transform is used. Further wavelet selection criteria based on
minimum permutation entropy is employed to select most appropriate base wavelet. Statistical features from selected
wavelet coefficients are calculated to form feature vector. To reduce size of feature vector information gain attribute
selection method is employed. Modified feature set is fed in to machine learning algorithm such as random forest and
self-organizing map for getting maximize fault identification efficiency. Results obtained revealed that attribute selection
method shows improvement in fault identification accuracy of bearing components.
In this study a 3-D finite element analysis for cantilever plate structure excited by giving unit deflection
at free end is presented. Finite Element Modeling based on ANSYS12.0 package using modal analysis
and harmonic analysis is used in this study for cantilever plate structure by patch type of piezoelectric
plates of PZT-5H4E as a piezo material and steel as a substrate material for Cantilever Beam. This
study aims to investigate the influence of different geometry parameters like, length and width &
position of piezo patches on voltage generation & try to find out optimal geometrical dimensions of
piezoelectric beam for maximum energy harvesting. ANSYS-12.0 is used as optimization tool. Here the
basic modeling with an equivalent circuit is done initially by considering some specific dimensions of
beam. Then simulation of the same is done by varying different geometrical parameters where effect of
change in length of piezo patch is analyzed first .The second affecting parameter considered is change
in Width of piezo patch and last one is the position of piezo patch along the length of beam is analyzed,
where output is measured in turn of voltage generated. This study aims to investigate the Optimum
placement of piezoelectric actuators in a cantilever beam for maximum energy harvesting.
Piezoelectric materials are being explored for shape and vibration control. In this paper Finite Element formulation for analyzing general shell structures under the influence of piezoelectric actuators is presented. Reduced integration is carried out to overcome problem of shear locking, and integration is carried out numerically in all three directions to obtain accurate results. The FE formulation is compared with the current literature. Experiments are conducted on curved beams and experimental results are compared with the current Finite Element formulation. Non-linearity is observed at higher voltages. Typical FEA results on a doubly curved hemispherical shell are also presented.
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