Department of Mechanical engineering
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Item Design and fabrication of single drive tri-axis MEMS gyroscope(Elsevier, 2024-03) Rao, Venkatesh K.P.Gyroscopes are sensors that measure the angular rate of an rotating object along one or more coordinate axis. For measuring angular rate along all three axes, usually three different single axis gyroscopes are used. Three sensor systems imply more space and power requirements which are precious commodities in microelectronics. Single-drive tri axis gyroscopes overcome this issue. Owing to their design complications, they have not been explored to the scale of the single axis gyroscopes. In this paper we present a novel design of single drive tri-axis MEMS gyroscope with detail explanation of its working principle. Since gyroscopes are resonant sensors, the natural frequencies of drive and sense modes are expected to be as close to each other as possible to ensure maximum sensitivity. These frequencies depend on the structural dimensions of the design. A design optimization procedure using Finite Element Method (FEM) based parametric modal analysis has been suggested in order to achieve mode matching. An equivalent analytical model is also presented for drive mode and all three sense modes. The optimized design is fabricated using modified silicon on glass bulk micromachining technique. The natural frequencies in drive and sense modes of as fabricated devices were measured and compared with the numerical and analytical values, The experimental values of frequencies are well within 16% of the numerical values. A design upgrade has been suggested to further reduce this error value.Item Coupled field simulation of mems tuning fork gyroscope(Springer, 2025-06) Rao, Venkatesh K.P.The use of Microelectromechanical Systems (MEMS) based sensors has become increasingly popular due to the growing demand for miniaturization in electronics. Though developing these sensors may require multiple iterations on smaller samples, Finite Element Method (FEM) based simulations offer a viable solution by enabling the optimization of design parameters to a significant degree. A FEM based simulation methodology has been designed in this paper to incorporate electromechanical coupling in an electrostatically actuated tuning fork gyroscope using COMSOL Multiphysics. The simulation results have been compared with analytical values and an existing simulation example that combines numerical and analytical approaches. The obtained sense mode displacement values predicted by the model lie within 5% of the analytically predicted values and the values predicted by the simulation example.Item Numerical evaluation of residual stresses induced during metal cutting(Elsevier, 2018) Rao, Venkatesh K.P.Residual stress analysis plays a very important role in the structural safety and stability of the component. Residual stress has a great influence on the fatigue life of the structures. Residual stress reduces the load carrying capacity along with source of crack generation. The analysis of residual stress is complicated as it depends upon the tool geometry and cutting parameters. This work focuses on the effects of tool geometry and cutting parameters on residual stress in orthogonal machining of Aluminum 1100-0 using the finite element method (FEM) simulation. Explicit dynamics analysis is carried out in ANSYS Workbench. The results reveal the variation of residual stress as a function of tool geometry, depth of cut, nose and the machining speed. The results provide the inter relation between the residual stress and afore mentioned parameters