Achieving Quality and Reliability

Abstract

This paper is a subjective summary of nine conferences on quality and reliability organized by the Institution of Mechanical Engineers during the last decade. Starting from economic factors, optimum design is identified with minimum total life cost, which is, in turn, closely related to reliability. The paper examines reliability theory briefly for its practical implications, e.g. that reliability depends crucially on safety margin and loading roughness. The former is a design feature, but both are operator controlled. The matching of design to the requirements of the user in the intended environment is considered paramount. It is shown that reliability is so dependent on such factors that design for prescribed levels of reliability presents formidable difficulties. The design process is discussed, taking these and maintenance constraints into account. The necessity for proper development is underlined. It is noted how realistic theory supports everyday practical experience. Finally, the function of management is discussed.