Akhilesh Gogikar | IIT Kharagpur (original) (raw)
Papers by Akhilesh Gogikar
The document details of the modelling of a solar powered glider and the power requirements of the... more The document details of the modelling of a solar powered glider and the power requirements of the glider in a gliding flight. The model is based on the successful sky sailor powered glider which had achieved 24hr sustained flight. The glider was simulated from an initial condition of gliding at a certain height while the remote controller gave constant commands to the actuators of the glider. The details of the power requirements of each actuator powered by a model servo motor have been included into the document. The range and endurance data of the flights have also been recorded.
This document details the procedure of calculation of orbital perturbation due to gravitational h... more This document details the procedure of calculation of orbital perturbation due to gravitational harmonics by simulation of various orbits at different altitudes and inclinations to the earth's equatorial plane. The orbits were first simulated and data of position and velocity was collected. The data was then analysed by another program to calculate the perturbations. Runge – Kutta fourth order method was used to simulate the orbits. The orbits were assumed to start from the perigee position which lied on the longitudinal plane containing the point of vernal equinox. The perturbations obtained were analysed w.r.t inclination of orbits and eccentricity of the orbits. The order of magnitude of the perturbations obtained were analysed w.r.t altitude. The earth was assumed to be symmetrical in all other terms.
The report contains the study of servo actuators used in the deployment of various active surface... more The report contains the study of servo actuators used in the deployment of various active surfaces such as ailerons, flaps, rudder elevator etc. The technical details and working of the servo actuators was studied and analysed during the testing of the actuators. Following the study a MATLAB Simulink based simulation was undertaken and to simulate a servo actuator as close to the real one as was possible. The results of the simulation as compared to the data of the actual servo actuators has been tabled to validate the degree of similarity simulated.
Race car performance depends on elements such as the engine, tires, suspension, road, aerodynamic... more Race car performance depends on elements such as the engine, tires, suspension, road, aerodynamics, and of course the driver. In recent years, however, vehicle aerodynamics gained increased attention, mainly due to the utilization of the negative lift (downforce) principle, yielding several important performance improvements. A historical overview of the significance of the aerodynamic applications of drag reduction and downforce and how it has improved race car performances has is discussed. After this a detailed explanation of the various aerodynamic devices such as inverted wings, diffusers, and vortex generators is discussed. A large amount of reference is given to Formula one applications, as it is safe to say that those are the peaks race car technology has strived to reach. Due to the complex geometry of these vehicles, the aerodynamic interaction between the various body components is significant, resulting in vortex flows and lifting surface shapes unlike traditional airplane wings. A lot of other aerodynamics devices have also being deployed over the years to improve performance. A combination of the effects of all these devices generates the ultimate race car. A brief insight has also been given about the Dynamic lifting devices recently being implemented.
The incompressible couette flow problem given in the book " CFD basics and applications " by J.D.... more The incompressible couette flow problem given in the book " CFD basics and applications " by J.D.Anderson Jr. was taken up and Matlab code to solve the same was developed. The flow was resolved into a staggered grid and the momentum equations were used to generate the velocity fields and then the Poisson equation was solved to generate the pressure field. This was done iteratively till the solution converged.
The document details of the modelling of a solar powered glider and the power requirements of the... more The document details of the modelling of a solar powered glider and the power requirements of the glider in a gliding flight. The model is based on the successful sky sailor powered glider which had achieved 24hr sustained flight. The glider was simulated from an initial condition of gliding at a certain height while the remote controller gave constant commands to the actuators of the glider. The details of the power requirements of each actuator powered by a model servo motor have been included into the document. The range and endurance data of the flights have also been recorded.
This document details the procedure of calculation of orbital perturbation due to gravitational h... more This document details the procedure of calculation of orbital perturbation due to gravitational harmonics by simulation of various orbits at different altitudes and inclinations to the earth's equatorial plane. The orbits were first simulated and data of position and velocity was collected. The data was then analysed by another program to calculate the perturbations. Runge – Kutta fourth order method was used to simulate the orbits. The orbits were assumed to start from the perigee position which lied on the longitudinal plane containing the point of vernal equinox. The perturbations obtained were analysed w.r.t inclination of orbits and eccentricity of the orbits. The order of magnitude of the perturbations obtained were analysed w.r.t altitude. The earth was assumed to be symmetrical in all other terms.
The report contains the study of servo actuators used in the deployment of various active surface... more The report contains the study of servo actuators used in the deployment of various active surfaces such as ailerons, flaps, rudder elevator etc. The technical details and working of the servo actuators was studied and analysed during the testing of the actuators. Following the study a MATLAB Simulink based simulation was undertaken and to simulate a servo actuator as close to the real one as was possible. The results of the simulation as compared to the data of the actual servo actuators has been tabled to validate the degree of similarity simulated.
Race car performance depends on elements such as the engine, tires, suspension, road, aerodynamic... more Race car performance depends on elements such as the engine, tires, suspension, road, aerodynamics, and of course the driver. In recent years, however, vehicle aerodynamics gained increased attention, mainly due to the utilization of the negative lift (downforce) principle, yielding several important performance improvements. A historical overview of the significance of the aerodynamic applications of drag reduction and downforce and how it has improved race car performances has is discussed. After this a detailed explanation of the various aerodynamic devices such as inverted wings, diffusers, and vortex generators is discussed. A large amount of reference is given to Formula one applications, as it is safe to say that those are the peaks race car technology has strived to reach. Due to the complex geometry of these vehicles, the aerodynamic interaction between the various body components is significant, resulting in vortex flows and lifting surface shapes unlike traditional airplane wings. A lot of other aerodynamics devices have also being deployed over the years to improve performance. A combination of the effects of all these devices generates the ultimate race car. A brief insight has also been given about the Dynamic lifting devices recently being implemented.
The incompressible couette flow problem given in the book " CFD basics and applications " by J.D.... more The incompressible couette flow problem given in the book " CFD basics and applications " by J.D.Anderson Jr. was taken up and Matlab code to solve the same was developed. The flow was resolved into a staggered grid and the momentum equations were used to generate the velocity fields and then the Poisson equation was solved to generate the pressure field. This was done iteratively till the solution converged.