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Control of exterior ballistic properties of spin-stabilized bullet by optimizing internal mass distribution

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Lahti, Janne
dc.contributor.author Sailaranta, Timo
dc.contributor.author Harju, Mikko
dc.contributor.author Virtanen, Kai
dc.date.accessioned 2020-02-03T09:03:45Z
dc.date.available 2020-02-03T09:03:45Z
dc.date.issued 2019-02-01
dc.identifier.citation Lahti , J , Sailaranta , T , Harju , M & Virtanen , K 2019 , ' Control of exterior ballistic properties of spin-stabilized bullet by optimizing internal mass distribution ' , Defence Technology , vol. 15 , no. 1 , pp. 38-50 . https://doi.org/10.1016/j.dt.2018.10.003 en
dc.identifier.issn 2214-9147
dc.identifier.other PURE UUID: f3c4ad6d-c520-4d9f-8aa6-8e4ab968cc5d
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/control-of-exterior-ballistic-properties-of-spinstabilized-bullet-by-optimizing-internal-mass-distribution(f3c4ad6d-c520-4d9f-8aa6-8e4ab968cc5d).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/40473077/1_s2.0_S2214914718303131_main.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/42970
dc.description.abstract This paper introduces a novel approach for controlling the exterior ballistic properties of spin-stabilized bullets by optimizing their internal mass distributions. Specifically, the properties of interest are the bullets’ stability characteristics that are examined through dynamic and gyroscopic stability parameters. New analytical expressions for aerodynamic quantities are also derived to address the compressibility of air. These expressions are utilized in a bullet model that enables efficient computation of the stability parameters for a given mass distribution. The bullet model is used in the formulation of nonlinear optimization problems that provide optimal mass distributions with respect to given goals, i.e., desired stability characteristics. The bullet types investigated in this paper are a long range bullet and a limited range training bullet. In the optimization of the mass distribution of the long range bullet, the goal is that the bullet stays stable for as long as possible. The mass distribution of the training bullet is optimized such that the bullet is stable at launch but becomes unstable shortly afterwards. The global optimal solutions obtained with the new approach fulfill the desired stability characteristics better than currently used uniformly filled bullets. Overall, the optimization approach reveals a new goal focused philosophy for bullet design compared to current trial and error design practices. en
dc.format.extent 13
dc.format.extent 38-50
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher China Ordnance Society
dc.relation.ispartofseries Defence Technology en
dc.relation.ispartofseries Volume 15, issue 1 en
dc.rights openAccess en
dc.subject.other 111 Mathematics en
dc.title Control of exterior ballistic properties of spin-stabilized bullet by optimizing internal mass distribution en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Mathematics and Systems Analysis
dc.contributor.department Aero RD Ltd
dc.contributor.department Department of Mathematics and Systems Analysis en
dc.subject.keyword Aerodynamics
dc.subject.keyword Bullet
dc.subject.keyword Exterior ballistics
dc.subject.keyword Mass properties
dc.subject.keyword Optimization
dc.subject.keyword Stability
dc.subject.keyword 111 Mathematics
dc.identifier.urn URN:NBN:fi:aalto-202002032050
dc.identifier.doi 10.1016/j.dt.2018.10.003
dc.type.version publishedVersion


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