Abstract:

Risk assessment is one of the common methods of identify non-standard automobile product defects. An improved risk matrix method was proposed based on trapezoid fuzzy number to solve some practical problems of assessing the defect hazard. Subjective or qualitative comments of severity, probability and risk rank of defect hazard were quantified by using trapezoid fuzzy number. The influence weight of severity and probability was determined by pair-wise comparison in analytic hierarchy process (AHP) theory. Risk evaluations from different analyses were synthesized. Taking the defect of vacuum booster as example, the risk value was calculated using the method. The results demonstrate the engineering practicability and effectiveness of the method.

Key words: automobile safety, automobile defect, risk assessment, defect judgment, fuzzy number, risk matrix