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Kalaichelvan, K.
- Design and Control of Autonomous Underwater Vehicle using Variable Buoyancy System
Authors
1 Department of Production Technology, MIT, Anna University, Chrompet, Chennai-600044, IN
Source
Digital Signal Processing, Vol 4, No 9 (2012), Pagination: 419-422Abstract
The autonomous underwater vehicles are operated by power thrust to reach the desired depth. This system consumes more power or thrust and it is overcome by variable buoyancy system. In this project a feedback system is used by employing a control pressure sensor. With the help of this pressure sensor, the depth sensor is to be designed. The signal from the pressure sensor will be used to find the depth of the immersion of autonomous underwater vehicle from the top of the water surface. The signal from the pressure sensor is used to maintain the autonomous underwater vehicle at desired depth level. The sea level pressure is measured with help of pressure sensor. The output of the pressure sensor is an analog signal and is given to the ADC (analog to digital converter) port of microcontroller which takes decision on pumping sequence depending upon the input voltage (the digital value given to it)the microcontroller will control the driver unit to pump either in or out based on control signal. When the required depth level is reached the driver circuits takes some delay and automatically drives the pump out circuit to pump out the water till the preset value is reached. This sequence of pumping in and pumping out of the water will be controlled by the microcontroller for various digital input values.Keywords
Buoyancy, Pressure Sensor Calibration, Depth Control.- Evaluation of Formability of Tubular Material by Hydro Forming Technique
Authors
1 Dept. of Mechanical Engg., B S Abdur Rahman University, Vandalur, Chennai, IN
2 Dept. of Prod. Engg., M. I. T, Anna University, Chennai, IN
3 B S Abdur Rahman University, Vandalur, Chennai, IN
4 Dept. of Mechanical Engg., Anna University, Chennai, IN
Source
Manufacturing Technology Today, Vol 9, No 5 (2010), Pagination: 3-6Abstract
Hydro forming is a method of deforming sheet metal and tubular materials with the help of pressurized fluid medium using closed dies. In tube hydro forming process an internal fluid medium (inside the tube) serves as the forming medium and the tube is bulged into the desired shape through simultaneous application of axial feed and internal pressure. This paper aims to study the formability characteristic for aluminum tubular materials (A9 6063) for expansion zone geometry by considering various parameters such as axial feed, fluid medium, and semi cone angle of 20°. The formability of tube material was evaluated by varying the process parameters. In the experimental work, the tubular specimen was placed between the two halves of a split die and filled with oil as the forming medium. This tooling was mounted on a hydraulic press. The punch was advanced into the tube to increase the fluid pressure and to provide axial feed of the tube. The optimal expansion zone geometry was identified by various experimental trials, to get flaw free component.
Keywords
Formability, Tube Hydro Forming, Expansion Zone, Pressurised Fluid Medium.- Modelling, Simulation and Analysis of Three Degrees of Freedom Triglide Parallel Manipulator
Authors
1 Dept. of Mechanical Engg., Rajagopal Polytechnic College, Gudiyattam-632602, Tamil Nadu, IN
2 Dept. of Production Technology, MIT Campus, Anna University, Chennai-600044, IN
Source
Manufacturing Technology Today, Vol 7, No 8 (2008), Pagination: 3-8Abstract
This article presents modelling, simulation, kinematic and workspace analysis of a triglide type of three degrees of freedom parallel manipulator actuated by screw pairs and spherical pairs. A fabricated model of the manipulator has been used for experimental analysis to find the angular tilt of moving platform. A computer program with suitable algorithms is developed to find the displacement of the nuts of the screw pairs and the kinematic analysis is performed. In order to further validate the model the software package ADAMS (Automatic Dynamic Analysis of Mechanical Systems) is used to simulate to verify the displacement and angular tilt of the moving platform. The results obtained from experimental, analytical and simulation methods are verified and found to be closer in all the three cases. This mechanism of parallel manipulator, no doubt shall find its way for performing applications like machining inclined holes, contour milling and angular machining with accuracy and precision.- Effect of Heat Treatment on Forming Limit Strains in Aluminium Alloy Sheets
Authors
1 MIT Campus, Anna University, Chromepet, Chennai - 44, IN
Source
Manufacturing Technology Today, Vol 3, No 8 (2004), Pagination: 3-5Abstract
This paper focuses on formability value of aluminium alloy sheet in the stretch forming operation. The formability of materials can be varied with respect to different heat treatment processes. Aluminium alloy sheets were prepared for the required size under cold rolled, polymer quenched and annealed conditions. A hemispherical punch and ring die were designed and fabricated for performing the stretch forming operations. The surface of each aluminium alloy sheet was imprinted with circular grid pattern of diameter 5 mm and these sheets were stretch formed by using the punch and die. The change in grid pattern after deformation were measured and analysed for major and minor strain values. From these values a formability limit diagram was constructed for each heat treatment conditions. From the forming limit diagram it is found that the annealed and polymer quenched aluminium alloy sheets have good formability. For increasing the formability value of the Aluminium alloy sheets, the stretch forming of the annealed specimen was repeated by applying the proper lubricant (SAE 40) in between the work and punch surface. It is found 2% increase in major strain in lubricating condition. The tensile strength of the sheet metal is found in UTM with constant cross head speed. The tensile strength of polymer quenched aluminium alloy sheet is placed very close to the cold rolled one. Hence polymer quenched aluminium sheets are recommended for making automobile components.- Modelling, Simulation and Analysis of Angular Drilling Machine Using Parallel Manipulator Mechanism
Authors
1 Dept, of Production Technology, M.l.T.Campus, Anna University, Chromepet, Chennai-6000 44, IN
2 Centre for Aerospace Engineering, M.l.T. Campus, Anna University, Chromepet, Chennai -6000 44, IN