Using the fuzzy design theory,the safety factor of bolts for cylinder head is judged fuzzily based on considering the design,manufacture,material and using condition.

• 运用模糊设计理论,在考虑了设计水平、制造水平、材料性能和使用等因素的基础上,对柴油机气缸盖螺栓的安全系数取值大小进行了模糊综合判断,并给出了一个例子。