dc.description.abstract |
The application of composites has been increasing dramatically in aerospace
structures recently, for example, composites have contributed over 50 percent
of the structure mass of large transport airplanes Boeing 787 and Airbus
350XWB. However, the further usage has been restricted because of the high
material and manufacturing costs. Hence, it is essential to utilize cost estimation
tools for accurate cost estimation in the early design stages, and then efficient
decisions and design optimizations could be made to reduce the cost of
composite products.
This research project aims to develop a cost model for aerospace carbon fibre
reinforced plastic (CFRP) composites, which will help designers and cost
engineers with the cost estimation for composites manufacturing in the early
development stages. The main objectives of the research are to: (i) recognise
the standard manufacturing stages and activities of CFRP components; (ii)
identify the cost drivers of composites manufacturing; (iii) identify the cost
estimation relationships; (iv) develop a cost model that can assist designers and
engineers with manufacturing cost estimation for CFRP components; (v)
validate the developed cost model through case studies and expert judgements.
The process of model development was carried out through four main steps:
firstly, conducting an integrated understanding of cost modelling for composites
manufacturing; secondly, collecting data for cost modelling from industry and
existing literature and databases; thirdly, developing the cost model with several
function modules and databases; and finally, taking a validation of the
developed model.
The developed cost model consists of several modules: material selection,
process planning, cost estimation, cost reporting and a user friendly interface.
Moreover, the selection and planning modules are combined with databases
including material and process.
The developed model enables the user to estimate the manufacturing cost and
process time of CFRP composites, and it can also help designers realize the
impact of design changes on the manufacturing cost. The process planning can
efficiently help estimators with manufacturing process understanding and
accurate time estimation. Quality control activities are time consuming and
investment sensitive in composites manufacturing. |
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