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The design target with definite purpose character of product quality was described in a real fuzzy number (named fuzzy target for short in this paper),and its membership functions in common use were given. According to the fuzzy probability theory and the robust design principle, the robust design rule based on fuzzy probability (named fuzzy robust design rule for short) was put forward and its validity and practicability were analyzed and tested with a design example. The theoretical analysis and the design examples make clear that, while the fuzzy robust design rule was used, the fine design effect can be obtained and the fuzzy robust design rule can be very suitable for the choice of the membership function of the fuzzy target; so it has a particular advantage.
The design target with definite purpose character of product quality was described in a real fuzzy number (named fuzzy target for short in this paper), and its membership functions in common use were given. According to the fuzzy probability theory and the robust design principle, the robust design rule based on fuzzy probability (named fuzzy robust design rule for short) was put forward and its validity and practicability were analyzed and tested with a design example. The theoretical analysis and the design examples make clear that, while the fuzzy robust design rule was used, the fine design effect can be obtained and the fuzzy robust design rule can be very suitable for the choice of the membership function of the fuzzy target; so it has a particular advantage.