Transverse Movement Analysis and Its Influence on Diesel Piston Design

Abstract

<div class="htmlview paragraph">The latest advances made in the development in a theoretical analysis of piston movement are described, covering the introduction of such new features as non-parallel bores, ring/groove friction, conservation of angular momentum at impact, and kinetic energy loss at impact. A single value of friction co-efficient of 0.2″ is derived from experimental data and the new program is shown to give good agreement with measured piston movement traces.</div> <div class="htmlview paragraph">The movement program is used to examine several piston design features in respect of their influence on impact severity and indicates the importance of gudgeon pin offset, piston/liner clearance and gudgeon pin height when considering piston noise.</div> <div class="htmlview paragraph">Further study on the features of friction and impact conditions are suggested, and the work is seen to have wider implications in the development of a complete set of piston assembly predictive design techniques.</div>