Model development and Control of a circular cantilevered structure using piezoelectric patch actuators
Guides:
Dr.Faruque Ali and Prof. Narayanan S, IIT Madras (Aug'14 - present)
Abstract
The project deals with the analysis and control of cantilevered structures under non-
uniform thermo-mechanical loads. The structure is under non-uniform thermal and
mechanical loading. The goal is to reduce the structural deflection by design of control
techniques for actuation the piezoceramics(MFCs) using state feedback. It is assumed that
PZT patches are bonded at various locations on the beam, and a controller that receives
strain input and actuates them accordingly to minimize deflection or dissipate vibrations
induced.
Control Theoretic Analysis of Gas-evolution Oscillators
(accepted at CCDC), published in IEEExplore
Guide
Dr.Gaurav Raina (Jan'14 - present)
Abstract
Models that describe the dynamics of chemical oscillators are often associated with a delayed feedback. In this paper, we focus on one such model proposed by Bar-Eli and Noyes to explain the mechanism of gas-evolution oscillators. First, a local stability analysis of the system is performed to obtain the necessary and sufficient condition for stability. It is identified that the loss of stability occurs through a Hopf bifurcation. A measure for the rate of convergence of the system to its steady state is found using the Lambert W function. Further, the orbital stability of the bifurcating periodic solutions and the type of Hopf bifurcation is analysed. Finally, we perform a robust stability analysis of the linearised system using Vinnicombe gap metric for parametric uncertainties. This control theoretic analysis attempts to improve the mathematical understanding of the behaviour of gas-evolution oscillators.
Vibrating Mesh Nebulizer Design and Development
Guide
Dr. Mahesh Panchagnula. IIT Madras (Jan'14 - present)
Abstract
This is an attempt to build, prototype and fabricate an economic Vibrating Mesh Nebulizer for medical applications.
A nebulizer's major use is to alleviate respiratory ailments. This type of nebulizer consists of a vibrating piezoelectric
stack actuator, operating at high frequencies to nebulize the medical fluid, through a mesh with micron-sized holes, into
aerosol. A sonotrode component is also required to amplify piezoelectric vibrations. After modeling the system, a ring-type
piezoelectric transducer is chosen the system, and the optimal dimensioning was done for the entire system and is being fabricated.
Simulation and Software Development for Orifice Selection for Hoist Application
(To be submitted for patent)
Summer Intern at Engineering Design Center, Caterpillar Inc., Chennai (June '14 - July '14)
Abstract
Time of operation from a constant-pressure pump (or cycle time) for forward and reverse operation of the cargo loading
arrangement are required to be equal. Using varying orifice size and flow requirements,
a software tool is to be created to design the orifice plate, and to generate
performance curves including that of system efficiency based on input parameters:
flow, oil type, diameter, and pressure drop. Flexible configurations also to be allowed as input. Software tool is generated using
Visual StudioTM.
Convertible Freezer Design and Product Development
Summer Intern at Home Appliances Lab, LG Electronics, Noida (May '13 - July '13)
Abstract
Design of a freezer convertible to refrigerating compartment for winter usage. Modification of air and refrigerant systems
performed to enable low-cost convertibility of freezer.
- Simulations in ANSYS FLUENT performed for air flow separation between the freezer and refrigerator compartment.
- Improvement in energy-savings documented and validated
using a fabricated prototype.
- Stringent lean design performed from multiple options for temperature modulation.