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package Physics::Ballistics; |
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use strict; |
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use warnings; |
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# Work in progress; currently useless except for documentation. |
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# Would like this to become an easy, powerful interface akin to http://www.shooterscalculator.com/ballistic-trajectory-chart.php?t=0c84354b |
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# Generate graphs from multiple profiles via flight_sim, ebc, lethality, etc. |
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# Include in output statistics about weight and recoil. |
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use Math::Trig; |
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our $VERSION = '1.03'; |
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our $PI = Math::Trig::pi; |
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sub setundef { ${$_[0]} = $_[1] unless ( defined ( ${$_[0]} ) ); } |
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sub absolute { $_[0] = 0 - $_[0] if ( $_[0] < 0 ); return $_[0]; } |
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our %FUNCTION_DEPENDENCIES_H = ( |
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'ebc' => [ |
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{label => 'proj_mass', unit => 'grain'}, |
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{label => 'proj_diam', unit => 'mm'}, |
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[{label => 'proj_shape', unit => ''}, {label => 'proj_form_factor', unit => ''}], # list means one or the other must be defined |
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], |
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'flight_simulator' => [ |
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{label => 'drag_model', unit => ''}, |
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{label => 'proj_bc', unit => ''}, |
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{label => 'velocity', unit => 'fps'}, |
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{label => 'sight_height', unit => 'inch'}, |
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{label => 'shot_angle', unit => 'degree'}, |
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{label => 'zero_range', unit => 'yard'} |
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], |
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'muzzle_energy' => [ |
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{label => 'proj_mass', unit => 'grain'}, |
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{label => 'velocity', unit => 'fps'} |
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], |
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'muzzle_velocity_from_energy' => [ |
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{label => 'proj_mass', unit => 'grain'}, |
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{label => 'proj_ke', unit => 'ftlb'}, |
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], |
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'cartridge_capacity' => [ |
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{label => 'proj_diam', unit => 'mm'}, |
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{label => 'case_base_diam', unit => 'mm'}, |
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{label => 'case_len', unit => 'mm'}, |
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{label => 'pressure', unit => 'psi'} |
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], |
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'empty_brass' => [ |
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{label => 'proj_diam', unit => 'mm'}, |
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{label => 'case_base_diam', unit => 'mm'}, |
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{label => 'case_len', unit => 'mm'}, |
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{label => 'pressure', unit => 'psi'} |
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], |
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'gunfire' => [ |
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{label => 'proj_diam', unit => 'mm'}, |
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{label => 'case_base_diam', unit => 'mm'}, |
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{label => 'case_len', unit => 'mm'}, |
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{label => 'pressure', unit => 'psi'}, |
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{label => 'proj_mass', unit => 'grain'}, |
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{label => 'barrel_len', unit => 'inch'} |
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], |
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'powley' => [ |
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{label => 'proj_diam', unit => 'mm'}, |
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{label => 'case_base_diam', unit => 'mm'}, |
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{label => 'case_len', unit => 'mm'}, |
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{label => 'barrel_reference_len', unit => 'inch'}, |
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{label => 'barrel_len', unit => 'inch'} |
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], |
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'ke' => [ |
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{label => 'velocity', unit => 'mps'}, |
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{label => 'proj_mass', unit => 'grain'} |
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], |
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'penetration_rha' => [ # Physics::Ballistics::Terminal::pc() |
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{label => 'proj_mass', unit => 'grain'}, |
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{label => 'velocity', unit => 'fps'}, |
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{label => 'proj_diam', unit => 'inch'}, |
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{label => 'proj_composition', unit => ''} |
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], |
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'penetration_flesh' => [ # Physics::Ballistics::Terminal::poncelet() |
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{label => 'proj_mass', unit => 'grain'}, |
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{label => 'velocity', unit => 'fps'}, |
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{label => 'proj_diam', unit => 'inch'}, |
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{label => 'proj_composition', unit => ''} |
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] |
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); |
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our %FUNCTION_PRODUCT_H = ( |
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'ebc' => [ |
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{label => 'proj_bc', unit => 'grain'}, |
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], |
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'flight_simulator' => [ |
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{label => 'flight_ar', unit => 'list'} |
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], |
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'muzzle_energy' => [ |
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{label => 'proj_ke', unit => 'ftlb'} |
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], |
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'muzzle_velocity_from_energy' => [ |
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{label => 'reference_velocity', unit => 'fps'} |
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], |
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'cartridge_capacity' => [ |
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{label => 'case_volume', unit => 'grain_water'} |
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], |
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'empty_brass' => [ |
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{label => 'case_mass', unit => 'grain'} |
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], |
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'gunfire' => [ |
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{label => '', unit => 'hash', mapping => { |
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'N*m' => {label => 'proj_ke', unit => 'joule'}, |
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'f/s' => {label => 'velocity', unit => 'fps'} # zzapp -- whenever setting velocity, also set reference velocity for 24" barrel |
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}} |
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], |
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'powley' => [ |
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# special-case -- multiply by reference velocity to get new velocity -- zzapp |
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], |
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'ke' => [ |
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{label => 'proj_ke', unit => 'joule'} |
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], |
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'penetration_rha' => [ # Physics::Ballistics::Terminal::pc() |
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{label => 'proj_penetration_rha', unit => 'mm'} |
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], |
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'penetration_flesh' => [ # Physics::Ballistics::Terminal::poncelet() |
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{label => 'proj_penetration_flesh', unit => 'mm'} |
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] |
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); |
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1; |
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=head1 NAME |
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Physics::Ballistics -- Ballistics formulae. |
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=head1 ABSTRACT |
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Ballistics is the study of the launching, flight and effects of projectiles. |
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This distribution provides various formulae producing metrics of internal, |
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external and terminal ballistics. |
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These formulae are primarily oriented towards the ballistics of small arms |
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bullets between 5mm and 14mm and diameter, and to a lesser extent heavier |
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hypervelocity projectiles ("long rod" penetrators) and shaped charges. |
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More extensive documentation is available in each of these three constituent |
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modules. |
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=head1 MODULES |
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L - launch mechanics |
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L - flight mechanics |
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L - terminal effects |
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=head1 TODO |
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I would like Physics::Ballistics to provide the integrated functionality of |
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these modules in an object-oriented way, someday. |
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156
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Some rocket physics functions are works in progress. Those might get integrated here eventually. |
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The units used and returned by these functions are horribly inconsistent, but at least they are documented. They might be made more consistent in the future. |
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160
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See also the individual modules for module-specific to-do lists. |
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=head1 AUTHOR |
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164
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TTK Ciar, |
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166
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=head1 COPYRIGHT AND LICENSE |
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168
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Copyright 2007-2017 by TTK Ciar |
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170
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This library is free software; you can redistribute it and/or modify it under |
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the same terms as Perl itself. |
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=cut |