Department of Computer Science and Information Systems
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Item Experimental Analysis and Optimal Control of PZT Based Cantilever Beam Using Fuzzy-PID Controllers(IEEE, 2022) Yenuganti, SujanIn this study experimental analysis and control of a PZT based cantilever is performed using Fuzzy-PID controllers. Two PZT patches were attached to the rigid end of the Cantilever beam out of which one was used as an actuator and another PZT was used as a sensor. The sensor input was provided to a computer using an NI DAQ card. The sensor signal was received by the computer through LABVIEW software where the control algorithms using PID and Fuzzy-PID controller were designed. At the rigid end of the cantilever beam, a magnet was attached and an electromagnet was used as a controller for controlling the vibrations. The vibration suppression was done at the first order mode frequency of the cantilever beam and both PID and fuzzy-PID controllers show good suppression of the vibrations. However, the results show that fuzzy-PID controllers have better characteristics than PID control.Item Performance Enhancement in Stainless Steel Pressure Sensor(Springer, 2020-07) Yenuganti, SujanA piezoelectric resonant pressure sensor fabricated with stainless steel with a modified design to improve its performance is proposed in this work. The sensor consists of a stainless steel diaphragm, inclined trusses, hinged vertical mounts, and a resonating doubly clamped beam. The deflection of the diaphragm with applied pressure is transferred to the resonating beam via a stress transmission mechanism comprising of inclined trusses and vertical mounts. The sensor is fabricated with SS 304 grade stainless steel using electrical discharge machining (EDM) and wire-cut EDM process. The sensor was tested for its characteristics for an input pressure of 0–25 bar. The experimental results demonstrate that the proposed sensor was found to have better linearity, higher sensitivity, and low hysteresis as compared to a similar pressure sensor existing in the literature. Sensor design is simple; fabrication involves well-known machining process, self-packed, and hence cost effective.Item Piezoelectric based Resonance Displacement sensor(IEEE, 2013) Yenuganti, SujanThe paper presents design and development of a resonance displacement sensor. The sensor is built with cantilever as a resonator with piezoelectric excitation and sensing in closed loop electronics. The sensor measures the unknown displacement with good linearity within the measurement range. The input displacement varies the length of the resonator by a fixed roller arrangement. The shift in resonance frequency for a change in displacement is detected by closed loop electronics.Item Thickness sensor for ferromagnetic sheets(IEEE, 2012) Yenuganti, SujanThe paper presents a novel design and development of a resonant sensor to measure thickness of ferromagnetic sheets and their alloys. The sensor is built with cantilever beam as a resonator with electromagnetic excitation and piezoelectric sensing in closed loop electronics. The sensor measures the unknown thickness by measuring the resonance frequency of the resonator. The magnetic force due to the magnetic field interaction between electromagnet and ferromagnetic sheet will make the resonator at resonance. The resonator vibrates at different resonance frequencies depending on the thickness of the ferromagnetic sheet. The shift in resonance frequency for a change in thickness is detected by closed loop electronics. The proposed system is simple and varies linearly with thickness in the given measurement range and the sensitivity is improved by increasing the magnetic field strength of the electromagnet.Item T-Shaped Resonating Beam Pressure Sensor(IEEE, 2012) Yenuganti, SujanA resonant pressure sensor with a provision for incorporating appropriate actuation and detection mechanism using fully surface micromachined process is presented in this paper. The pressure sensing element is a Tshaped resonating beam encapsulated beneath a polysilicon rectangular diaphragm and fully enclosed in a sealed vacuum cavity. This design enables high pressure sensitivity, miniature chip size and as well as good environmental isolation. The proposed structure is evaluated for pressure sensitivity theoretically and numerically using MEMS CAD tool CoventorWare. The pressure sensitivity of the sensor with a T-shaped 1.2 μm thick beam is found to be 10.2%/bar with the beam resonance frequency of about 792 kHzItem A Differential Hall Effect Based Pressure Sensor(Springer, 2021-01) Yenuganti, SujanThis paper presents the design and simulation of a pressure sensor integrated with two identical hall effect sensors and permanent magnets arranged in a differential configuration for measuring pressure in the range of 0–20 bar. The sensor uses the deflection of a circular diaphragm with a simple rigid mechanical structure to convert the applied pressure to a differential hall voltage output. A complete analytical modelling was carried out by assuming the rigid mechanical structure as a central circular boss structure on the circular diaphragm. Numerical simulations were also carried out in COMSOL Multiphysics FEM tool to support the analytical results. Before going for actual fabrication, the optimum sensor dimensions were also fixed from both analytical modelling and numerical simulation analysis. The sensor was planned to be fabricated completely using different grades of stainless steel and hence can be used in high temperature and corrosive environments. The fabricated sensor can be of low cost, self-packaged and the differential arrangement helps in compensating for any ambient temperature variations.Item Improved energy harvesting from a clamped–clamped micro beam with cavity(Springer, 2020-11) Yenuganti, SujanThis paper presents modelling and numerical evaluation of a piezo electrically excited clamped–clamped micro beam (CCMB) with cavity as a vibrational energy harvester. The harvester micro beam is made to vibrate at resonance by piezoelectric excitation to resemble the ambient vibration conditions. The generated voltage from the CCMB with cavity is found to be higher when compared to a similar CCMB without cavity. An analytical expression for the output voltage is derived for a particular actuation voltage at resonance and further analysis is also carried out by varying the position and thickness of the cavity to extract maximum output voltage from the CCMB harvester with and without cavity. The analytical results are well supported by numerical simulation results that are carried out in COMSOL Multiphysics FEM tool. The introduction of cavity in CCMB increases the generated peak output voltage when compared with CCMB without cavity. The proposed CCMB harvester design with cavity can also be replaced by bridge resonators in various MEMS/NEMS based sensors with piezoelectric excitation and detection.