TTi Project Update Oil- Pulse Driver February 10, 2017 Jessica Manning, Hallie Stidham,

Transcription

1 TTi Project Update Oil-Pulse February 10, 2017 Jessica Manning, Hallie Stidham, Department of Mechanical Engineering, Clemson University

2 Outline 2 of 21 Problem Statement Executive Summary Major Accomplishments Experiments Models Next Steps

3 Problem Statement 3 of 21 Oil-pulse unit was implemented into an oilpulse driver based off of a patent without full understanding of how it works TTi wants to implement this fundamental idea into other units but has been unable to do so due to their lack of understanding

4 Outline 4 of 21 Problem Statement Executive Summary Major Accomplishments Experiments Models Next Steps

5 Executive Summary 5 of 21 The project goal is to create a standard to analyze an oil pulse mechanism. This will be completed through a thorough analysis combining experimental and analytical methods. The mathematical models will emphasize lumped parameter and CAD tools to allow direct manipulation of the design variables. Bench top laboratory testing will be performed to observe system function and mechanical features.

6 Outline 6 of 21 Executive Summary Major Accomplishments Experiments Models Next Steps

7 Experiment 1-Disassembly 7 of 21 Goal: disassemble the oil-pulse driver to identify the parts to the oil-pulse unit Modifications were then made to allow us to see how the unit works

8 Experiment 2-Plexiglass Cover 8 of 21 Motor Output Shaft Blade Liner Oil Pulse Unit Plexiglas Cover

9 Experiment 2-Plexiglass Cover 9 of 21

10 Experiment 3- Temperature Reading 10 of 21 Goal: Measure the temperature of the inner liner (closest to oil) to deduce oil temperature increase Setup 1 was ineffective, disassembly and reassembly process led to driver not operating correctly Setup 2 more promising, less wobble introduced yet smaller increase in temperature measured Setup 1: four holes on each side Setup 2: two holes on right side Next Step: Try and use thermocouples to measure oil temperature directly

11 Outline 11 of 21 Executive Summary Major Accomplishments Experiments Models Next Steps

12 Solidworks Model 12 of 21 Determined the volume of the different cavities in the liner and established a pattern with the changes in volume Discovered the volume difference in the dugouts of the anvil Observed a difference between the center of mass and the center of the geometry of the liner Created a large scaled version of the oil pulse mechanism Anvil Liner

13 Mathematical Model 13 of 21 Defined variables needed to effectively model the system in Simulink and Matlab Established two major systems, Electrical and Mechanical Mechanical consists of the gears which transfer the Electrical Actuation to Mechanical Motion. Mechanical motion then uses Hydro Mechanical Power to Turn the driver OUTPUT TORQUE OIL PULSE MECHANISM ELECTRICAL MECHANICAL GEARS

14 Mathematical Model 14 of 21 Electrical Mechanical Battery Motor Gear train Outer Liner Input Voltage DC Motor Hydraulic Fluid Mechanical Fluid Center Shaft End Effect Work Piece The Hydraulic Fluid is the mystery box. It could be treated as a Rotary Valve Pump, a Journal Bearing, or a Hydraulic Pump.

15 Geometry Analysis 15 of Chamber Volume (without anvil and blades) Volume (in^3) The blue dots indicate the larger dugouts on the anvil only 90 The anvil stays still and the liner rotates, the degrees corresponds to the liner rotation The chamber corresponds to the cavity in the liner and will stay with the individual cavity throughout the rotation

16 Degrees of Rotation of the Liner vs. Chamber Volumes 16 of 21 Degrees vs. Chamber Volumes Volume (in 3 ) Degrees Chamber 1 Chamber 2 Chamber 3 Chamber 4

17 Outline 17 of 21 Executive Summary Major Accomplishments Experiments Models Next Steps

18 New Experiment 18 of 21 Experiment 4 Pressure Reading with Improved Plexiglass Cover Using the pressure readings the bulk modulus of the oil will be determined and factored into the impact theory Plexiglass cover changes Increased size for gauge hole Increased length of liner 1/8" NPT Female to UNF Male Brass Pipe Adapter Straight L-6S Improved Cover Pressure Gauge

19 New Experiment 19 of 21 Transducer measures pressure once every 360 rotation of anvil Current setup measures pressure in area where springs are located Springs are not located within one of the four dugouts The four dugouts lead to four separate chambers with four different pressures Where transducer measures pressure Area where pressure measurement is being taken in oil-pulse unit (where springs are housed)

20 Pressure Transducer Experimental Update 20 of 21 Hole will be drilled down anvil, then at a 45 angle Allows us to measure pressure in one chamber at a time End of hole in dugout Top view down anvil with hole that connects to dugout Beginning of hole down anvil Side view of hole in one dugout Hole path from anvil to dugout

21 Thank you 21 of 21 Any Questions?