Technical Papers

Technical Papers

Report of the Condition of a General Electric Transportation Systems Gearbox

2 GearboxDescription The DOE began installing a General Electric (GE) 1.5-megawatt (MW) wind turbine at its National Wind Technology Center...

Technical Papers

A Comparison of Surface Roughness Measurement Methods for Gear Tooth Working Surfaces

1           Introduction Surface roughness is a critical parameter for gears operating under a variety of conditions. It directly influencesfrictionandcontacttemperature,andthereforehasanimpactonvariousfailuremodessuchas macropitting, micropitting,...

Technical Papers

Surface Treatment of Powder-Bed Fusion Additive Manufactured Metals for Improved Fatigue Life

Introduction The high-cycle fatigue (HCF) properties of metallic materials made by additive manufacturing (AM) have received considerable recent interest (Ref...

Technical Papers

AH-64 Loss of Lubrication Study: Test of Isotropic Superfinished AH-64 (Apache) Engine Nose Gearbox Without Black Oxide Coating

INTRODUCTION Isotropic Superfinish (ISF*) technology applied to gears has become the benchmark for surface finishing of rotorcraft gearing. The performance...

Technical Papers

Future Advanced Rotorcraft Drive System (FARDS) Full Scale Gearbox Demonstration

The eighteen technologies include the following: Gear Technologies 1. C64 gear steel material 2. Cavitation peening 3. Optimized gear teeth...

Technical Papers

Gear Repair for Helicopters and Wind Turbines via Isotropic Superfinishing

Abral = a proprietary, abrasive vibratory finishing process AEO = all engines operative OEI = one engine inoperative CAVF =...

Technical Papers

Gear Corrosion During the Manufacturing Process

Crevice corrosion Crevice corrosion is a localized form of corrosion that occurs in narrow openings or spaces where the localized...

Technical Papers

High Speed, Automatable Superfinishing of Rear-Axle Hypoid Gears

INTRODUCTION Only a very brief description of superfinishing will be presented here since it is discussed in detail elsewhere.3,4,5 The process...

Technical Papers

The Effect of Superfinishing on Gear Micropitting, Part II

Experimental Gear design The gears used were the standard FZG- C type gears for micropitting testing. Table 1 gives the...

Technical Papers

A Novel Approach to the Refurbishment of Wind Turbine Gears

Background Wind turbine gears experience several types of repairable damage including micropitting or “gray staining”, abrasive wear, foreign object damage...

Technical Papers

Superfinishing and its Effect on Micropitting

  [caption id="attachment_8811" align="aligncenter" width="300"] Figure1. Illustrates the progressive levelling effect of isotropic finishing processes.[/caption] Chemically accelerated vibratory finishing is...

Technical Papers

The Impact of Surface Condition and Lubricant on Gear Tooth Friction

The experimental effort is conducted on a high speed, power re-circulating (PC), gear test rig, which had been specially instrumented...

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