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69 lines
2.4 KiB
Plaintext
69 lines
2.4 KiB
Plaintext
#include "..\script_component.hpp"
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/*
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* Author: esteldunedain
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* Calculate the cooling down of a weapon over a time interval.
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*
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* Arguments:
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* 0: Initial temperature <NUMBER>
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* 1: Barrel mass <NUMBER>
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* 2: Time interval <NUMBER>
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*
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* Return Value:
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* Final temperature <NUMBER>
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*
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* Example:
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* [_temperature, _barrelMass, _totalTime] call ace_overheating_fnc_calculateCooling
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*
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* Public: No
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*/
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params ["_temperature", "_barrelMass", "_totalTime"];
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// The lowest temperature a weapon can reach is the ambient air temperature.
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private _ambientTemperature = ambientTemperature select 0;
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// If a long time passed since the last shot, there's no need to calculate anything; the weapon should be cool
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if (_totalTime > 1800) exitWith {_ambientTemperature};
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if (_temperature <= _ambientTemperature) exitWith {_ambientTemperature};
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//AR-15 (0.00570m bullet diameter) (barrel diameter usually 0.75" or 0.008255m radius)
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//Steel Denisty = 7850 m^3 / kg
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//Area of a cylinder (2/r)*(Pi * r^3 + V) - for a 0.008255m radius barrel -> Area = 210(1/meters) * Volume
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//Adjusted volume for being hollowed out is ~1.1x
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//So Area = 210 * 1.1 * (mass / 7850) = mass * 0.029427 (for steel near that diameter)
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private _barrelSurface = _barrelMass * 0.029427;
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private _convectionRate = 25;
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//provide additional cooling if swimming or raining or windy
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if (ACE_player call EFUNC(common,isSwimming)) then {
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_convectionRate = 500;
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} else {
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// this will give a convection rate between 25 (no wind or rain) and 125 (max rain and >=50 m/s wind)
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_convectionRate = _convectionRate * ((linearConversion [0,1,rain,1,5,true] + (5 min (vectorMagnitude wind / 10))) / 2);
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};
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TRACE_4("cooling",_temperature,_totalTime,_barrelMass,_barrelSurface);
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private _time = 0;
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while {true} do {
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private _deltaTime = (_totalTime - _time) min 20;
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_temperature = _temperature - (
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// Convective cooling
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_convectionRate * _barrelSurface * _temperature
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// Radiative cooling
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+ 0.4 * 5.67e-8 * _barrelSurface * ((_temperature + 273.15) ^ 4 - 273.15 ^ 4)
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) * GVAR(coolingCoef) * _deltaTime / (_barrelMass * 466);
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if (_temperature <= _ambientTemperature) exitWith {_ambientTemperature};
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if (isNil "_temperature") exitWith {
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diag_log text format ["[ACE] ERROR: _totalTime = %1; _time = %2; _deltaTime = %3;", _totalTime, _time, _deltaTime];
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0
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};
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_time = _time + _deltaTime;
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if (_time >= _totalTime) exitWith {_temperature max _ambientTemperature};
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};
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