Balesh Babali - Academia.edu (original) (raw)
Papers by Balesh Babali
2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT), 2021
In the present study of self-driving car motion planning and control, the primary focus is on vel... more In the present study of self-driving car motion planning and control, the primary focus is on velocity tracking and trajectory tracking. Although, many studies deal with velocity and trajectory tracking separately, during trajectory tracking yaw stability is hardly considered. In the present research, a fusion of the direct yaw stability control with lateral-longitudinal control in velocity and trajectory tracking for self-driving cars is studied. Considering vehicle dynamics, the velocity and trajectory tracking can be associated with lateral and longitudinal control of the car. In longitudinal control, a variable control structure with a sliding mode method has been incorporated. To carry out velocity tracking, the overall driving force is achieved against the error in velocity. In lateral control for trajectory tracking, a linear time-varying model predictive control (MPC) technique is employed to calculate the desired front wheel angle. Additionally, to upgrade the reliability and control of the longitudinal-lateral motion, a combined control framework is initiated. On this principle, to provide better yaw stability of the car while trajectory tracking, the driving force of the tire is assigned rationally by employing the direct yaw moment control. Simulation results give valuable evidence that the suggested control strategy is satisfactory in tracking the reference trajectory and velocity thereby improving the stability and the performance of the car
The present scenario, the main objective the engine designer's try to achieve is the best per... more The present scenario, the main objective the engine designer's try to achieve is the best performance with lowest possible emissions. Exhaust Manifold is one of the crucial components that have an influence on this objective. The designing of Exhaust Manifold is one of the complex procedures and relies on many variables like back-pressure, flow velocity, mechanical efficiency, volumetric efficiency, etc. In the present work, three different exhaust manifold models are considered with various pipe diameters. All three models differ from each other in geometry. Computational fluid dynamics simulation has been carried out with the help of ANSYS Fluent at three different speeds. The pressure contours and velocity streamlines are obtained for all the three models. The work is further extended by modeling two other models and the performed analysis results are validated with journal data. Manifold model 3 considered is yielding the least backpressure and indicates possible design prop...
Free natural convection in an enclosed space cavity with the various thermal applications, like d... more Free natural convection in an enclosed space cavity with the various thermal applications, like designing fields, nuclear reactors, solar storage systems in solid walls occur as the heat exchanger, fin type cooling. Heat transfer circulation within square cavity enclosed conducting wall thickness (t). It is analyzed for various fluids (Pr) ranges from 0.7 to 17. In the present study a limited volume, based computational method is use to investigate steady, laminar, free convection in enclosed space cavity. Adiabatic top and bottom walls bound the square cavity used for the flow of heat and transmission analysis. The (Gr) is varied from 103 - 107. As the Gr is increased, the rate of heat transfer also increases. Average Nu increases by means of Pr and conductivity quotient.
Free natural convection in an enclosed space cavity with the various thermal applications, like d... more Free natural convection in an enclosed space cavity with the various thermal applications, like designing fields, nuclear reactors, solar storage systems in solid walls occur as the heat exchanger, fin type cooling. Heat transfer circulation within square cavity enclosed conducting wall thickness (t). It is analyzed for various fluids (Pr) ranges from 0.7 to 17. In the present study a limited volume, based computational method is use to investigate steady, laminar, free convection in enclosed space cavity. Adiabatic top and bottom walls bound the square cavity used for the flow of heat and transmission analysis. The (Gr) is varied from 10 3 10 7 . As the Gr is increased, the rate of heat transfer also increases. Average Nu increases by means of Pr and conductivity quotient. A R T I C L E H I S T O R Y Received: 2019-06-20
Proceeding of Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), 2018
Journal of Thermophysics and Heat Transfer, 1995
Lecture Notes in Mechanical Engineering, 2021
In this study, conjugate natural convection in a square cavity filled with fluids under steady-st... more In this study, conjugate natural convection in a square cavity filled with fluids under steady-state condition is numerically investigated with the finite element method. The left side wall is considered as hot wall, and the right wall is considered to be cold. The top and bottom walls are assumed to be adiabatic. Different boundary conditions are introduced on the walls, and a thorough investigation is done in the present study. Numerical simulations have been done for different parameters of Grashof number (10 3-10 7) and Prandtl number. The graph of Nusselt number versus Grashof number and Nusselt number versus Prandtl number is plotted. It is observed that the buoyant forces developed in the cavity due to thermally induced density gradients vary as the value of acceleration due to gravity (g) differs, due to the change in temperature and stream function. Keywords Conjugate natural convection heat transfer Á Square cavity Nomenclature AR aspect ratio (H/L) g acceleration due to gravity (m s −2) H height of square cavity (m) K thermal conductivity (W m −1 K −1) L length of the square cavity (m)
2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT), 2021
In the present study of self-driving car motion planning and control, the primary focus is on vel... more In the present study of self-driving car motion planning and control, the primary focus is on velocity tracking and trajectory tracking. Although, many studies deal with velocity and trajectory tracking separately, during trajectory tracking yaw stability is hardly considered. In the present research, a fusion of the direct yaw stability control with lateral-longitudinal control in velocity and trajectory tracking for self-driving cars is studied. Considering vehicle dynamics, the velocity and trajectory tracking can be associated with lateral and longitudinal control of the car. In longitudinal control, a variable control structure with a sliding mode method has been incorporated. To carry out velocity tracking, the overall driving force is achieved against the error in velocity. In lateral control for trajectory tracking, a linear time-varying model predictive control (MPC) technique is employed to calculate the desired front wheel angle. Additionally, to upgrade the reliability and control of the longitudinal-lateral motion, a combined control framework is initiated. On this principle, to provide better yaw stability of the car while trajectory tracking, the driving force of the tire is assigned rationally by employing the direct yaw moment control. Simulation results give valuable evidence that the suggested control strategy is satisfactory in tracking the reference trajectory and velocity thereby improving the stability and the performance of the car
The present scenario, the main objective the engine designer's try to achieve is the best per... more The present scenario, the main objective the engine designer's try to achieve is the best performance with lowest possible emissions. Exhaust Manifold is one of the crucial components that have an influence on this objective. The designing of Exhaust Manifold is one of the complex procedures and relies on many variables like back-pressure, flow velocity, mechanical efficiency, volumetric efficiency, etc. In the present work, three different exhaust manifold models are considered with various pipe diameters. All three models differ from each other in geometry. Computational fluid dynamics simulation has been carried out with the help of ANSYS Fluent at three different speeds. The pressure contours and velocity streamlines are obtained for all the three models. The work is further extended by modeling two other models and the performed analysis results are validated with journal data. Manifold model 3 considered is yielding the least backpressure and indicates possible design prop...
Free natural convection in an enclosed space cavity with the various thermal applications, like d... more Free natural convection in an enclosed space cavity with the various thermal applications, like designing fields, nuclear reactors, solar storage systems in solid walls occur as the heat exchanger, fin type cooling. Heat transfer circulation within square cavity enclosed conducting wall thickness (t). It is analyzed for various fluids (Pr) ranges from 0.7 to 17. In the present study a limited volume, based computational method is use to investigate steady, laminar, free convection in enclosed space cavity. Adiabatic top and bottom walls bound the square cavity used for the flow of heat and transmission analysis. The (Gr) is varied from 103 - 107. As the Gr is increased, the rate of heat transfer also increases. Average Nu increases by means of Pr and conductivity quotient.
Free natural convection in an enclosed space cavity with the various thermal applications, like d... more Free natural convection in an enclosed space cavity with the various thermal applications, like designing fields, nuclear reactors, solar storage systems in solid walls occur as the heat exchanger, fin type cooling. Heat transfer circulation within square cavity enclosed conducting wall thickness (t). It is analyzed for various fluids (Pr) ranges from 0.7 to 17. In the present study a limited volume, based computational method is use to investigate steady, laminar, free convection in enclosed space cavity. Adiabatic top and bottom walls bound the square cavity used for the flow of heat and transmission analysis. The (Gr) is varied from 10 3 10 7 . As the Gr is increased, the rate of heat transfer also increases. Average Nu increases by means of Pr and conductivity quotient. A R T I C L E H I S T O R Y Received: 2019-06-20
Proceeding of Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), 2018
Journal of Thermophysics and Heat Transfer, 1995
Lecture Notes in Mechanical Engineering, 2021
In this study, conjugate natural convection in a square cavity filled with fluids under steady-st... more In this study, conjugate natural convection in a square cavity filled with fluids under steady-state condition is numerically investigated with the finite element method. The left side wall is considered as hot wall, and the right wall is considered to be cold. The top and bottom walls are assumed to be adiabatic. Different boundary conditions are introduced on the walls, and a thorough investigation is done in the present study. Numerical simulations have been done for different parameters of Grashof number (10 3-10 7) and Prandtl number. The graph of Nusselt number versus Grashof number and Nusselt number versus Prandtl number is plotted. It is observed that the buoyant forces developed in the cavity due to thermally induced density gradients vary as the value of acceleration due to gravity (g) differs, due to the change in temperature and stream function. Keywords Conjugate natural convection heat transfer Á Square cavity Nomenclature AR aspect ratio (H/L) g acceleration due to gravity (m s −2) H height of square cavity (m) K thermal conductivity (W m −1 K −1) L length of the square cavity (m)