In order to describe the complexity of aircraft and make the digital product definition ( dpd ) model hereditable and patulous , a product-process-resource ( ppr ) knowledge model for aircraft is presented .

摘要为描述飞机产品的复杂性，使数字化产品定义模型具有良好的可继承性和可扩展性，提出了飞机产品－过程－资源知识模型。