A Methodology for Integrated Cost Engineered Systems within Aerospace
A Methodology for Integrated Cost Engineered Systems within Aerospace
复制标题
航空航天领域集成成本工程系统的方法
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Early
中科院分区：
文献类型：
--
作者：
R. Curran;S. Raghunathan;M. Price;A. Kundu;E. Bénard;S. Castagne;P. Mawhinney;S. Crosby;J. Early
本文涉及工程驱动成本的建模，以便集成到系统工程方法中。该方法提出了一种遗传因果成本建模概念，将产品系列及其与工程设计参数的因果关系隔离开来。这包括为制造和组装成本对组装建造的每个阶段进行初始建模，其中假定材料成本直接作为每种类型的重量和单位成本的函数计算。然后，通过建立大型机身组件的经常性单位成本和非经常性设计成本的模型来考虑购置成本。最后，使用单位成本与运行成本之间关系的简单模型，对11个机舱的全寿命成本的影响进行了研究。运营成本被建模为燃料燃烧作为重量的函数，并允许在主要是金属或复合材料设计之间进行比较。一般而言，系统工程方法是通过根据客户要求和派生的系统要求重点对工程要求与成本相关的建模来促进的。然而，最终的目标函数应该是利润。这项工作没有考虑设计修改或维护，成本建模也没有明确地包括返工等相关成本、夹具和工装等以及管理费用。提出了一些工业案例研究，重点是通过优化零件数量来实现单位成本的降低。这些结果突出了早期优化设计的机会，通过使用因果参数成本动因来指导结构组件的概念性布局设计过程，这是面向制造和组装的设计方法的典型做法。主要工作涉及遗传因果成本建模，最后提出了将这一建模技术整合到系统工程设计模型中的建议方法。论文的主要贡献在于将成本作为概念设计参数的函数进行建模，并通过采购成本和燃料消耗(重量)通过直接运营成本将成本与客户要求联系起来。
The paper is concerned with the modelling of engineering driven costs for integration into a systems engineering approach. The methodology presents a Genetic Causal cost modelling concept that isolates product families and their causal relationship to engineering design parameters. This includes the initial modelling for each stage of assembly build for the fabrication and assembly costs, where material costs are assumed to be calculated directly as a function of the weight and unit cost for each type. The acquisition cost is then considered through the modelling of the recurring unit cost and the non-recurring design cost of larger airframe assemblies. Finally, the through-life cost impact is investigated using a simple model for the relationship between unit cost and operational cost for a range of 11 nacelles. The operational cost is modelled as fuel burn as a function of weight and allows the comparison between predominately metal or composites designs. In general, the systems engineering approach is facilitated by focusing on the modelling of engineering requirements relative to cost, in the light of customer requirements and derived systems requirements. However, ultimately the objective function should be profit. The work does not consider design modifications or maintenance, and the cost modeling does not explicitly include the associated costs of reworking etc, jigs and tooling etc, and overheads. A number of industrial case studies are presented that focus on the realised reduction in unit cost by optimizing part count. The results highlight the opportunity for the early optimization of design by using causal parametric cost drivers to guide the conceptual layout design process for structural assemblies, typical to the Design for Manufacture and Assembly approach. The main body of work is concerned with the Genetic Causal cost modelling and concludes with a suggested approach to the integration of this modelling technology into a systems engineering design model. The main contribution of paper is in the modelling of cost as a function of conceptual design parameters, and in the linking of that to customer requirements through acquisition cost and fuel burn (weight) through direct operating cost.