1 / 5

Tribology Lab

ME 4053. Tribology Lab. Objectives : Characterize elastohydrodynamic (EHD) lubrication using an optical technique. The study involves: Measurement of the lubricating film thickness as a function of: rolling velocity normal load

marika
Télécharger la présentation

Tribology Lab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ME 4053 Tribology Lab • Objectives: Characterize elastohydrodynamic (EHD) lubrication using an optical technique. The study involves: • Measurement of the lubricating film thickness as a function of: • rolling velocity • normal load • Comparison of the measured film thickness with a theoretical film thickness (from the Hamrock & Dawson equation) • Experimental Setup: Light Source: Camera Monitor Camera Light Source Nd aperture Semi- reflective Surface Loading Mechanism Glass plate (connected to motor) Steel ball Fiberoptic Cable condenser Contact Area

  2. Experimental Setup (cont’d) Camera Light Beam side view: top view: Nd glass disc u oil film rc Fringe pattern h W(load) Nd: rpm; u: rolling velocity; h: film thickness Rolling velocity: Measured oil film thickness: , where: exp : wavelength of light in air (600nm) N: fringe order n: refractive index of oil (1.5) : phase shift constant (0.1)

  3. Experimental Procedure: obtain the following table for W=16N & W=30N computed from Nd, N computed from HD equation measured Theoretical Thickness, ht: The Hamrock & Dawson Equation t R: ball radius W*: dimensionless load parameter U*: dimensionless speed parameter G*: dimensionless material parameter

  4. Results Presentation: Theoretical/Experimental Comparison: *Practical note on load adjustment: Load = 2 x (spring value - tare value) (tare = 3.2N) Ex: to get W=16N, set spring value to 11.2N 16 = 2 x (11.2 - 3.2)

  5. Reporting Requirements • Notebook entry only • Must have objective, setup, procedure, per usual. Be sure to have plot of results similar in format to what is shown on previous slide • Provide conclusions. Be sure to address how well experimental results match theoretical and explain relationship between normal load, rolling velocity, and film thickness

More Related