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This paper deals with the application of design of experiments (D.O.E.) to study the effect of nine different design parameters on valvetrain noise. The parameters selected deal with components such as the camshaft, valves, valve springs, rocker arms and cylinder head. The D.O.E. quantifies parameter importance based on overall sound pressure levels measured on a motored Chrysler 3.3L engine. The study sparked further interest in camshaft design parameters. An attempt was made to determine what camshaft design parameter, valve seating velocity, acceleration, or jerk, was most important in reducing overall valvetrain noise.

This paper deals with the applications of the Design for Manufacturing and Assembly (DFMA) process to the development of a new front suspension system in the PL Small Car Platform at Chrysler Corporation. At the very early stages of the program timing schedule, it was found necessary to introduce a structured DFMA program to bring together a cross-disciplinary team from within Chrysler as well as from the supplier companies. The major objective of this simultaneous engineering activity was to optimize all the design, manufacturing and assembly factors of the front suspension system. The Qualitative spreadsheet was created as one of the efficient tools in the DFMA program to perform the analysis and continuously track the DFMA issues. The specific examples in the paper demonstrate how the process optimizes the relationship between design, manufacturing and assembly factors in the development of a product.