为快速、准确地响应加工中心用户的可用性需求，需要准确评估加工中心各组件对用户可用性需求的满足程度，从而有针对性地构建可用性保障机制。针对加工中心产品的用户可用性需求的特点，以及加工中心各组件间自相关关系，引入质量功能展开理论(Quality function deployment，QFD)，建立可用性功能展开屋模型(Dynamic availability of the house，DHOA)。由于用户需求与加工中心各组件间的相关系数具有不确定性、呈区间数值的特点，采用区间灰关联分析与可用性功能展开融合方法，求解可用性功能展开模型的输出项，确定各组件对可用性需求重要度。以国产某型号加工中心为实例，验证该模型的合理性与有效性。

The evaluation,which is the degree of availability requirements generated by the components of CNC machine tools,must be assessed accurately,for responding the availability requirements of numerical control machine tools accurately and quickly machine tools. The dynamic house of availability(DHOA) model is established through introducing the quality function deployment (QFD) theory,aiming at the characteristic of availability requirements in CNC machine tool and the relationship of self-correlation between the components. Because the correlation coefficient between the user requirements and components in machining center is uncertainty and numerical interval,the calculation of availability requirements importance is realized by combining the interval gray relational analysis model with the DHOA model. Finally,the rationality and availability of the DHOA model is validated by taking a domestic machine center as an example.