Assessing Fit and Finish Design Sensitivity By Mapping Measurements to VNM Utility 2020-01-0600
In the automotive industry “fit and finish” is the term applied to the perceived quality of the alignment of one part to another. Fit and finish gives the buyer a sense of the overall quality of the vehicle purely from an aesthetic perspective. Fit and finish is usually evaluated by the manufacturer through dimensional measurements of the “gap” and “flush” conditions between panels. Since variation in the measurements increases the probability that a vehicle will result in poor fit and finish, relatively arbitrary limits are put on these measurements to define whether a gap or flush condition is acceptable or not. It is suspected that the relationship between the appropriate measurement limits and the customer’s perception of quality is highly influenced by the design of the interface between panels. This paper proposes a method to evaluate the sensitivity of the perceived quality of the designed interface to variation in the measurements of gap and flush. The novelty is in the application of the concept of von Neumann-Morgestern utility to fit and finish. The significance is the ability to evaluate design decisions governing perceived quality based on their sensitivity to inevitable manufacturing variation.
Christopher Slon, Xiaona LI, Vita Valetchikov, Vijitashwa Pandey