ENBIS-13 in Ankara

15 – 19 September 2013 Abstract submission: 5 February – 5 June 2013

The Practical Use of Experimental Design in the Development of New Lubricants

17 September 2013, 10:10 – 10:30

Abstract

Submitted by
Maggie Wenham
Authors
Maggie Wenham (Shell Global Solutions (UK))
Abstract
The development of new lubricants involves a great variety of testing; from screening tests on new formulations in the lab to testing in vehicles or machinery under real-life operating conditions. Statistical design of experiments is used at all stages of the development process. This talk outlines the main types of design used at each of four stages: laboratory screening, lab-based emulation of service conditions, testing in vehicles/machinery and lastly, field trials.
The general considerations of experimental design are discussed in relation to experiments at each stage, especially the challenges of keeping nuisance factors constant as you move closer to the real-life situation. Examples of Latin-square and balanced incomplete block designs are discussed in the context of laboratory tests emulating service conditions, using time factors as the blocking terms. Examples of designs for engine and vehicle tests are also given where particular attention is drawn to the issues of ensuring that the experimental units are properly identified so that the correct error term is used in the analysis. Finally, the ultimate challenge of conducting fleet trials is discussed, where the conditions are far from the idealised conditions in a laboratory environment.

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