Browsing by Author "Gangadharan, K."

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Design and development of magneto-rheological brake for optimum casing thickness
(Institute of Electrical and Electronics Engineers Inc., 2017) Sumukha, M.H.; Sandeep, R.; Vivek, N.; Lijesh, K.P.; Kumar, H.; Gangadharan, K.
The online control of torque by Magneto-Rheological (MR) brake through MR Fluid makes an attractive option to replace the conventional disc brake. The torque provided by the MR brake depends on the magnetic flux generated on the MR fluid by the electromagnet. However the magnetic flux generated in a MR brake depends on the thickness of the casing, properties of MR fluid and material property of the MR brakes. Extensive work has been performed on improving the magnetic properties of MR fluid. However no work has been performed yet, to understand the thickness of the casing required for generating higher magnetic flux on MR fluid. Therefore in the present work, the dependence of casing thickness on the generation of magnetic flux on MR fluid region is studied using ANSYS software. Detailed electro-static analysis has been performed by varying the thickness of the casing and the magnetic flux at the MR fluid was evaluated. Based on the obtained results, MR brake having the desired thickness was developed. The generated magnetic flux values were validated with the reading obtained from Gauss meter. The obtained results are presented. Â© 2017 IEEE.
Model based test equipment design and controller tuning for elevator endurance test rig
(Institute of Electrical and Electronics Engineers Inc., 2017) Prasad, M.; Gangadharan, K.
Servo-controlled elevator is one of the primary flight control actuators which controls pitch of the aircraft. To prove out its design, a qualification test equipment or endurance test rig is needed. Using endurance test rig, aerodynamic load is simulated by a double-Acting servo-controlled linear hydraulic cylinder to the elevator actuator. The design of the endurance test rig primarily depends on load and velocity requirements. The main aim of this work is to design the endurance test rig and tune the load controller based on simulation results and analysis. A high fidelity, non-linear mathematical model of elevator endurance test rig is developed and validated against experimental data. Critical parameters of test equipment were identified based on mathematical modeling and simulation. An appropriate load cylinder and its electro-hydraulic servo valve are chosen to meet load and velocity requirements. The rig structure stiffness has also been determined by iterative simulations. The performance and stability of the test system areas certained through dynamic analysis of the model for every flight case. Finally, a model based load controller is designed and deployed to the experimental setup with simple proportional-integral (PI) and velocity feed-forward control to meet the load control performance satisfactorily. Â© 2015 IEEE.
Platform for mechatronics education using (1) mechatronics technology demonstrator and (2) web based virtual experimentation
(American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2017) Shetty, D.; Umesh, P.; Gangadharan, K.
Increasing demands on the productivity of complex systems, such as machine tools and their steadily growing technological importance will require the application of new methods in the product development process. This paper shows that the analysis of the simulation results from the simulation based mechatronic model of a complex system followed by a procedure that allows a better understanding of the dynamic behavior and interactions of the components. This paper will highlight the results of interaction between National Institute of Technology, (NITK) Surathkal, India and University of District of Columbia (UDC) in the area of Mechatronics and virtual testing. Mechatronics is a design philosophy, which is an integrating approach to engineering design. Through a mechanism of simulating interdisciplinary ideas and techniques, mechatronics provides ideal conditions to raise the synergy, thereby providing a catalytic effect for the new solutions to technically complex situations. Many real-world systems can be modeled by the mass-spring-damper system and hence considering one such system, namely Mechatronics Technology Demonstrator (MTD) is taken as the first example. MTD is a portable low cost, technology demonstrator that can be used for teaching mechatronics system design. The paper highlights design optimization of several mechatronic products using the procedures derived by the use of mass spring damper based mechatronic system. The second example is on web based virtual experimentation, where the experiment is conducted by remote triggering of Torsion Testing Machine. Remote triggered (RT) experimentation is a method of remotely controlling the laboratory equipment by an internet based system from a webpage. RT lab is an excellent way for the students to get access to expensive state of the art labs and equipment. The present work deals with the systematic approach of realizing a remote triggered experimentation on a horizontal torsional testing machine which can be triggered from a tablet PC or a laptop through an internet connection directed to the server computer system. RT lab algorithms are built in the server computer and the information and controls will be displayed on an html webpage where the experiment can be conducted. In this experiment the machine is remotely started through a command in the webpage which will be directed to the main server computer system from a wireless handheld internet enabled device such as laptops or tablet PCs and render the suitable graph of the experiment in the device. The experiment is completely in the control of the user. The person can either on/off the main equipment with the help of the device within the given slot of time and the data from the graph can be retrieved for further analysis. The first example uses a software platform of VisSim and the second example uses a software platform LabView. Although located in two different locations and countries, this paper examines the common mechatronics philosophy and the design approach used in modeling, simulation, optimization and virtual experimentation in building robust mechatronics product and procedures. Â© Â© 2017 ASME.