SAMPE Journal - May/June 2021 - 29
Figure 3. Schematic of the wing manufacturing cost model.
* Manufacturing database: Overview of the manufacturing process,
materials and assembly process for the wing and all of its sub-components.
* Materials database: Detailed information on each type of material
used in the wing, e.g. fabric reinforcements, prepregs, resin, hardener,
surface coatings and adhesives.
* Production databases: Databases containing (i) a list of steps for each
production method and (ii) the production rate variables for scaling the
activities.
* Equipment database: Detailed information on the tooling,
moulds and equipment.
* Construction database: Wing construction data for the
external wing geometry and the internal wing structure.
Figure 2 (b) shows the generic production
flowchart used for each part in the wing. The
material, labour and equipment costs are
determined for each step in the flowchart.
Structure Breakdown Module
The first step for the cost model, after importing
the input data, is to break down the structure of all
the parts in the wing into geometric variables that
will be used for the material and labour analysis
modules. For each part, these variables include one
or more of the following:
* Total surface area of the part (SA)
* Total surface area of the fabric/prepreg
used in the part (PSA)
* Length of the fabric/prepreg used in the
part (Lplies)
* Length of the bond line (Lbond)
For parts that are glued together during
assembly, the length of the bond line is used as the
scaling variable for determining the labour hours
for activities like bond line trimming and gluing.
Figure 4 shows an example of the breakdown
of a hypothetical part. The part is initially split
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SAMPE Journal - May/June 2021
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2021
Table of Contents
SAMPE Journal - May/June 2021 - Cover1
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SAMPE Journal - May/June 2021 - Table of Contents
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SAMPE Journal - May/June 2021 - Cover3
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