Development Of Closed Loop System Evaluation Procedures
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Development of a Full-scale Transmission Testing Procedure to Evaluate Advanced Lubricants
Experimental tests were performed on the OH-58A helicopter main-rotor transmission in the NASA Lewis 500-hp Helicopter Transmission Test Stand. The testing was part of a joint Navy/NASA/Army lubrication program to develop a separate lubricant for gearboxes that would improve life and load-carrying capacity. The goal of the experiments was to develop a testing procedure using a MIL-L-23699 base reference oil to fail certain transmission components, and then to run identical tests with improved lubricants and demonstrate improved performance. The tests were directed at failing components that have given the Navy problems because of marginal lubrication. These failures included mast-shaft bearing micropitting, sun gear and planet bearing fatigue, and spiral bevel gear scoring. More than 900 hr of total run time were accumulated for these tests. Some success was achieved in developing a testing procedure to produce sun gear and planet bearing fatigue failures. Only marginal success was achieved in producing mast-shaft bearing micropitting and spiral bevel gear scoring.
Chassis Handbook
Author: Bernhard Heißing
language: en
Publisher: Springer Science & Business Media
Release Date: 2010-11-09
In spite of all the assistance offered by electronic control systems, the latest generation of passenger car chassis still relies on conventional chassis elements. With a view towards driving dynamics, this book examines these conventional elements and their interaction with mechatronic systems. First, it describes the fundamentals and design of the chassis and goes on to examine driving dynamics with a particularly practical focus. This is followed by a detailed description and explanation of the modern components. A separate section is devoted to the axles and processes for axle development. With its revised illustrations and several updates in the text and list of references, this new edition already includes a number of improvements over the first edition.