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MIT Self-Compensating Hydrostatic Bearings

MIT Self-Compensating Hydrostatic Bearings. 26 February 2010 Professor Alex Slocum Gerald Rothenhofer Matt Angle. A Quick Primer on Hydrostatic Bearings. High-Pressure Lubricant. Are Used to Support the Crankshaft in Automotive Engines

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MIT Self-Compensating Hydrostatic Bearings

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  1. MIT Self-Compensating Hydrostatic Bearings 26 February 2010 Professor Alex Slocum Gerald Rothenhofer Matt Angle

  2. A Quick Primer on Hydrostatic Bearings High-Pressure Lubricant • Are Used to Support the Crankshaft in Automotive Engines • Pump Forces Fluid Into a Channel and then Between a Shaft and Journal • Shaft Rides on Thin Film of Fluid • Metal-to-Metal Contact and Friction are Reduced Bearing Journal Shaft

  3. Issues with Non-Self Compensating Hydrostatic Bearings • Small Orifices • Used to Create Constant-Pressure Fluid Supply • Are Easily Clogged by Contaminants in Fluid (Especially Sea Water) • Control Loops • ?? • Water Hammer • High Flow Rates Cause Turbulence in Fluid Exit • Shaft Can Oscillate in Unsteady Flow

  4. Why ours is cool • Supply Grooves • Oriented on Inside of Bearing Assembly (Made of Two of These Pieces) • Extend ~180° to Pocket on Opposite Side of Bearing • Function as Orifices in Non-Compensating Bearings • Are Self-Cleaning and Difficult to Clog • Pockets • Bear Load of Shaft • Fed by Supply Channels • How it Works • When Shaft is Displaced, Supply Grooves are Blocked, Pressure Reduced in Pockets on Opposite Side of Shaft • Produces Restoring force

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