This paper introduces some concepts and calculation methods,such as primary qualification rate of welding,equivalent welded joint and qualification rate of equivalent welding.
介绍了焊接一次合格率、当量焊口、当量焊接合格率等概念及其计算方法。
Finally, the formula to calculate the equivalent people's number influenced by the noise is put forward.
根据Ｗｅｂｅｒ－Ｆｅｃｈｎｅｒ法则建立了反映铁路环境噪声对人们影响程度的数学模型， 进一步基于模糊积分给出了综合评价三个时段内铁路环境噪声对人们影响的数学方法，最后提出了受铁路环境噪声影响的当量人数计算公式。
