Airworthiness Certification of Metallic Materials

Saha, Biswajit; Wanhill, R.J.H.; Prasad, N. Eswara; Gouda, G.; Tamilmani, K

doi:10.1016/b978-0-12-401698-9.00016-1

Cited by 3 publications

(3 citation statements)

References 6 publications

(3 reference statements)

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“…Figure A.2 is an example. The acronyms refer to institutes and authorities concerned with validations, in this case in India (Saha et al 2014). TCs = Type Certificates.…”

Section: Data Availability Statementmentioning

confidence: 99%

Comment on ‘Composition-based aluminum alloy selection using an artificial neural network’

Wanhill

2024

Modelling Simul. Mater. Sci. Eng.

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This article comments on the article ‘Composition-based aluminum alloy selection using an artificial neural network previously published in this journal. It is shown that the input information of the modelling is much too limited and the selection procedure is simplistic and not applicable or relevant to the actual selection procedures for aerospace aluminum alloys. The modelling has been done without sufficient engineering knowledge (almost none) about the properties, selection criteria, alloy compositions and processing of aerospace structural aluminum alloys.

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“…Figure A.2 is an example. The acronyms refer to institutes and authorities concerned with validations, in this case in India (Saha et al 2014). TCs = Type Certificates.…”

Section: Data Availability Statementmentioning

confidence: 99%

Comment on ‘Composition-based aluminum alloy selection using an artificial neural network’

Wanhill

2024

Modelling Simul. Mater. Sci. Eng.

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“…If two identical parts are built in two different build orientations, each part can be expected to exhibit different surface qualities, dimensional accuracy and mechanical properties (Ahn et al, 2007;Chlebus et al, 2011). Aircraft parts must go through a time-consuming and expensive certification process and meet stringent airworthiness requirements (Saha et al, 2013). If a change in the manufacturing route leads to different part properties, that part must be re-certified.…”

Section: Research Motivationmentioning

confidence: 99%

Cost-driven build orientation and bin packing of parts in Selective Laser Melting (SLM)

Griffiths

Scanlan

Eres

et al. 2019

European Journal of Operational Research

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Selective Laser Melting (SLM) is an additive manufacturing process capable of producing mixed batches of parts simultaneously within a single build. The build orientation of a part in SLM is a key process parameter, affecting the build cost, time and quality, as well as batch size. Choosing an optimal arrangement of multiple heterogeneous parts inside the SLM machine also presents a challenging irregular bin packing problem. Since the two problems are interdependent, this paper addresses the combined problem of finding an optimal build orientation and two-dimensional irregular bin packing solution of a mixed batch of parts across identical SLM machines. We address this problem specifically in the context of low-volume high-variety (LVHV) production in the aerospace sector, using total build cost as the objective function. To solve this problem, we present an Iterative Tabu Search Procedure (ITSP), which consists of six distinct stages. We test each stage in the ITSP on 27 manually generated instances, based on 68 unique geometries ranging in convexity and size, including six real-life components from the aerospace industry. Two of the six stages, which are driven by support structure volume, returned the highest improvement in cost. Overall, the results showed an average cost improvement of 16.2% over the initial solution. The initial solution of the procedure was benchmarked against a commercial software, showing comparable results.

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“…Refs. [22,23] which describe the procedures instituted in India for existing and novel materials. A schematic is given in Figure 8.…”

Section: Aircraft Parts Manufacturer and Subcontractor Competencesmentioning

confidence: 99%

Archives of Metallurgy and Materials

Wanhill¹

2018

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Airworthiness Certification of Metallic Materials

Cited by 3 publications

References 6 publications

Comment on ‘Composition-based aluminum alloy selection using an artificial neural network’

Comment on ‘Composition-based aluminum alloy selection using an artificial neural network’

Cost-driven build orientation and bin packing of parts in Selective Laser Melting (SLM)

Archives of Metallurgy and Materials

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