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Concurrent Engineering
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Cost Estimation of Machined Parts within an Aerospace Supply Chain

P. Watson

School of Aeronautical Engineering, Queen’s University Belfast (QUB), N. Ireland, BT9 5AG, paul.watson{at}qub.ac.uk

R. Curran

School of Aeronautical Engineering, Queen’s University Belfast (QUB), N. Ireland, BT9 5AG

A. Murphy

School of Aeronautical Engineering, Queen’s University Belfast (QUB), N. Ireland, BT9 5AG

S. Cowan

Methods-procurement, Bombardier Aerospace Belfast (BAB), N. Ireland, BT3 9DZ

A generic, hierarchical, and multifidelity unit cost of acquisition estimating methodology for outside production machined parts is presented. The originality of the work lies with the method’s inherent capability of being able to generate multilevel and multifidelity cost relations for large volumes of parts utilizing process, supply chain costing data, and varying degrees of part design definition information. Estimates can be generated throughout the life cycle of a part using different grades of the combined information available. Considering design development for a given part, additional design definition may be used as it becomes available within the developed method to improve the quality of the resulting estimate. Via a process of analogous classification, parts are classified into groups of increasing similarity using design-based descriptors. A parametric estimating method is then applied to each subgroup of the machined part commodity in the direction of improved classification and using which, a relationship which links design variables to manufacturing cycle time may be generated. A rate cost reflective of the supply chain is then applied to the cycle time estimate for a given part to arrive at an estimate of make cost which is then totalled with the material and treatments cost components respectively to give an overall estimate of unit acquisition cost. Both the rate charge applied and the treatments cost calculated for a given procured part is derived via the use of ratio analysis.

Key Words: cost engineering • manufacturing cost estimating • aerospace procurement

Concurrent Engineering, Vol. 14, No. 1, 17-26 (2006)
DOI: 10.1177/1063293X06063424
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