然而，长期以来，在PVC生产过程中仍采用常规控制的方法，仅针对于某一特定的工艺流程、生产设备和产品，无法满足过程对控制系统柔性的要求。
However, for long time, only regulatory control has been implemented in PVC production, aiming at some particular craft process, equipments and products, can't satisfy the flexible request in system.
本文详细阐述了具有柔性船体的高性能船体上轴系对中过程中双头万向联轴节的定位法和工艺。
The paper described in detail the way and workmanship of centering of double head universal coupling during shafting alignment onboard high performance crafts that have flexible hulls.
论述了产品制造过程中的柔性工艺产生的原因及其工艺柔性存在的意义。
Discusses causation of flexible process in product manufacturing and significance of its flexibility.
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