2019-12-02 18:25:19 +00:00
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##########################################################################
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# Simple Brake Simulation System
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# 2010, Thorsten Brehm
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#
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# Simple simulation of brake energy absorption and cooling effects.
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#
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# This module computes (approximates... :-) ) an energy level which
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# (faintly) resembles the kinetic energy absorption and cooling effects
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# of a brake system. But instead of computing real temperatures, this
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# is just meant to distinguish normal energy levels from exceptionally
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# high levels. The target is to drive EICAS "brakes overheat" messages
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# and gear effects only, to "reward" pilots with exceptionally bad
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# landings...
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#
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# To avoid complicated calculations of different braking effects (roll/air
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# drag, reverse thrust etc), we simply assume the brake system to cause a
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# fixed deceleration (me.BrakeDecel). With this deceleration we approximate
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# the speed difference which would be caused by the brake system alone for
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# any given simulation interval. The difference of the kinetic energy level
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# at the current speed and the decelerated speed are then added up to the
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# total absorbed brake energy.
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# Units (knots/lbs/Kg) do not matter much here. Eventually a magic scaling
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# divisor is used to scale the output level. Any output > 1 means
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# "overheated brakes", any level <=1 means "brake temperature OK".
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# No exact science here - but good enough for now :-).
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##########################################################################
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2020-01-27 18:01:33 +00:00
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#
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# Added brakes temp calculations and adapted for A320-family
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# 2020, Andrea Vezzali
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#
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##########################################################################
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2019-12-02 18:25:19 +00:00
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var BrakeSystem =
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{
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new : func()
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{
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var m = { parents : [BrakeSystem]};
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# deceleration caused by brakes alone (knots/s2)
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m.BrakeDecel = 1.0; # kt/s^2
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# Higher value means quicker cooling
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2020-01-27 18:01:33 +00:00
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m.CoolingFactor = 0.00005;
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2019-12-02 18:25:19 +00:00
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# Scaling divisor. Use this to scale the energy output.
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# Manually tune this value: a total energy output
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# at "/gear/brake-thermal-energy" > 1.0 means overheated brakes,
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# anything below <= 1.0 means energy absorbed by brakes is OK.
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#m.ScalingDivisor= 700000*450.0;
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2020-01-08 22:39:10 +00:00
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2020-01-27 18:01:33 +00:00
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m.ScalingDivisor = 0.000000006;
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2019-12-02 18:25:19 +00:00
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m.LSmokeActive = 0;
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m.LSmokeToggle = 0;
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m.RSmokeActive = 0;
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m.RSmokeToggle = 0;
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2020-01-04 22:36:43 +00:00
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# m.LnCoolFactor = math.ln(1-m.CoolingFactor);
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2019-12-02 18:25:19 +00:00
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m.reset();
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return m;
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},
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reset : func()
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{
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# Initial thermal energy
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2020-01-04 22:36:43 +00:00
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setprop("gear/gear[1]/Lbrake-thermal-energy",0.0);
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setprop("gear/gear[2]/Rbrake-thermal-energy",0.0);
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2020-01-27 18:01:33 +00:00
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setprop("controls/gear/brake-fans",0);
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2020-01-04 22:36:43 +00:00
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setprop("gear/gear[1]/Lbrake-smoke",0);
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setprop("gear/gear[2]/Rbrake-smoke",0);
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2020-01-27 18:01:33 +00:00
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setprop("gear/gear[1]/L-Thrust",0);
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setprop("gear/gear[2]/R-Thrust",0);
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#Introducing a random error on temp sensors (max 5°C)
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setprop("gear/gear[1]/L1error-temp-degc", math.round(rand()*(5)));
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setprop("gear/gear[1]/L2error-temp-degc", math.round(rand()*(5)));
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setprop("gear/gear[2]/R3error-temp-degc", math.round(rand()*(5)));
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setprop("gear/gear[2]/R4error-temp-degc", math.round(rand()*(5)));
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var atemp = getprop("environment/temperature-degc") or 0;
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var vmach = getprop("velocities/mach") or 0;
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var tatdegc = atemp * (1 + (0.2 * math.pow(vmach, 2)));
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var tatdegf = 32+(1.8 * tatdegc);
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setprop("gear/gear[1]/L1brake-temp-degc",tatdegc+getprop("gear/gear[1]/L1error-temp-degc"));
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setprop("gear/gear[1]/L2brake-temp-degc",tatdegc+getprop("gear/gear[1]/L2error-temp-degc"));
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setprop("gear/gear[2]/R3brake-temp-degc",tatdegc+getprop("gear/gear[2]/R3error-temp-degc"));
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setprop("gear/gear[2]/R4brake-temp-degc",tatdegc+getprop("gear/gear[2]/R4error-temp-degc"));
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setprop("gear/gear[1]/L1brake-temp-degf",tatdegf+32+(1.8 * getprop("gear/gear[1]/L1brake-temp-degc")));
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setprop("gear/gear[1]/L2brake-temp-degf",tatdegf+32+(1.8 * getprop("gear/gear[1]/L2brake-temp-degc")));
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setprop("gear/gear[2]/R3brake-temp-degf",tatdegf+32+(1.8 * getprop("gear/gear[2]/R3brake-temp-degc")));
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setprop("gear/gear[2]/R4brake-temp-degf",tatdegf+32+(1.8 * getprop("gear/gear[2]/R4brake-temp-degc")));
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2019-12-02 18:25:19 +00:00
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setprop("sim/animation/fire-services",0);
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me.LastSimTime = 0.0;
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},
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# update brake energy
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update : func()
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{
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var CurrentTime = getprop("sim/time/elapsed-sec");
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var dt = CurrentTime - me.LastSimTime;
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2020-01-27 18:01:33 +00:00
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var LThermalEnergy = getprop("gear/gear[1]/Lbrake-thermal-energy");
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var RThermalEnergy = getprop("gear/gear[2]/Rbrake-thermal-energy");
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var LBrakeLevel = getprop("fdm/jsbsim/fcs/left-brake-cmd-norm");
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var RBrakeLevel = getprop("fdm/jsbsim/fcs/right-brake-cmd-norm");
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var atemp = getprop("environment/temperature-degc") or 0;
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var vmach = getprop("velocities/mach") or 0;
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var tatdegc = atemp * (1 + (0.2 * math.pow(vmach, 2)));
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var tatdegf = 32+(1.8 * tatdegc);
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setprop("environment/total-air-temperature-degc", tatdegc);
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setprop("environment/total-air-temperature-degf", tatdegf);
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var L_thrust_lb = getprop("engines/engine[0]/thrust_lb");
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var R_thrust_lb = getprop("engines/engine[1]/thrust_lb");
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2019-12-02 18:25:19 +00:00
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if (dt<1.0)
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{
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2020-01-27 18:01:33 +00:00
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var OnGround = getprop("gear/gear[1]/wow");
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#cooling effect: adjust cooling factor by a value proportional to the environment temp (m.CoolingFactor + environment temp-degc * 0.00001)
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var LCoolingRatio = me.CoolingFactor+(tatdegc*0.000001);
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var RCoolingRatio = me.CoolingFactor+(tatdegc*0.000001);
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2020-01-04 22:36:43 +00:00
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if (getprop("controls/gear/brake-fans"))
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{
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#increase CoolingRatio if Brake Fans are active
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2020-01-27 18:01:33 +00:00
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LCoolingRatio = LCoolingRatio * 3;
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RCoolingRatio = RCoolingRatio * 3;
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}
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if (getprop("gear/gear[1]/position-norm"))
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{
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#increase CoolingRatio if gear down according to airspeed
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LCoolingRatio = LCoolingRatio * getprop("velocities/airspeed-kt");
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} else {
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#Reduced CoolingRatio if gear up
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LCoolingRatio = LCoolingRatio * 0.1;
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2020-01-04 22:36:43 +00:00
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}
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2020-01-27 18:01:33 +00:00
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if (getprop("gear/gear[2]/position-norm"))
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{
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#increase CoolingRatio if gear down according to airspeed
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RCoolingRatio = RCoolingRatio * getprop("velocities/airspeed-kt");
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} else {
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#Reduced CoolingRatio if gear up
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RCoolingRatio = RCoolingRatio * 0.1;
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}
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if (LBrakeLevel>0)
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{
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#Reduced CoolingRatio if Brakes used
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LCoolingRatio = LCoolingRatio * 0.1 * LBrakeLevel;
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}
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if (RBrakeLevel>0)
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{
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#Reduced CoolingRatio if Brakes used
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RCoolingRatio = RCoolingRatio * 0.1 * RBrakeLevel;
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}
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var LnCoolFactor = math.ln(1-LCoolingRatio);
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var RnCoolFactor = math.ln(1-RCoolingRatio);
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2020-01-04 22:36:43 +00:00
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2020-01-27 18:01:33 +00:00
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L_thrust_lb = math.abs(getprop("engines/engine[0]/thrust_lb"));
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if (L_thrust_lb < 1)
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{
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L_thrust_lb = 1
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}
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L_Thrust = math.pow((math.log10(L_thrust_lb)),10)*0.000000001;
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R_thrust_lb = math.abs(getprop("engines/engine[1]/thrust_lb"));
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if (R_thrust_lb < 1)
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{
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R_thrust_lb = 1
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}
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R_Thrust = math.pow((math.log10(R_thrust_lb)),10)*0.000000001;
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if (OnGround)
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{
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2019-12-02 18:25:19 +00:00
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var V1 = getprop("velocities/groundspeed-kt");
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2020-01-08 22:39:10 +00:00
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var Mass = getprop("fdm/jsbsim/inertia/weight-lbs")*(me.ScalingDivisor);
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2020-01-27 18:01:33 +00:00
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2019-12-02 18:25:19 +00:00
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# absorb some kinetic energy:
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# dE= 1/2 * m * V1^2 - 1/2 * m * V2^2)
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2020-01-27 18:01:33 +00:00
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var V2_L = V1 - me.BrakeDecel * dt * LBrakeLevel;
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2020-01-04 22:36:43 +00:00
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var V2_R = V1 - me.BrakeDecel * dt * RBrakeLevel;
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2020-01-27 18:01:33 +00:00
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#TODO - Adjust ThermalEnergy according to differential braking
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#LBrakeLevel-RBrakeLevel
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LThermalEnergy += (Mass * (math.pow(V1, 2) - math.pow(V2_L, 2)) / 2);
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if (getprop("services/chocks/left"))
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{
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if (!getprop("controls/gear/brake-parking"))
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{
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# cooling effect: reduce thermal energy by (LnCoolFactor) * dt
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LThermalEnergy = LThermalEnergy * math.exp(LnCoolFactor * dt);
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} else {
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#LThermalEnergy += L_Thrust;
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# cooling effect: reduce thermal energy by (LnCoolFactor) * dt
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LThermalEnergy = (LThermalEnergy * math.exp(LnCoolFactor * dt)) + (L_Thrust * dt);
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}
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} else {
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if (!getprop("controls/gear/brake-parking"))
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{
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if (LBrakeLevel>0)
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{
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if (V2_L>0)
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{
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#LThermalEnergy += (Mass * (math.pow(V1, 2) - math.pow(V2_L, 2)) / 2) + L_thrust;
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# cooling effect: reduce thermal energy by (LnCoolFactor) * dt
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LThermalEnergy = LThermalEnergy * math.exp(LnCoolFactor * dt);
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} else {
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#LThermalEnergy += math.abs(L_Thrust);
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# cooling effect: reduce thermal energy by (LnCoolFactor) * dt
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LThermalEnergy = (LThermalEnergy * math.exp(LnCoolFactor * dt)) + (L_Thrust * dt);
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}
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} else {
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# cooling effect: reduce thermal energy by (LnCoolFactor) * dt
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LThermalEnergy = LThermalEnergy * math.exp(LnCoolFactor * dt);
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}
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} else {
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#LThermalEnergy += math.abs(L_Thrust);
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# cooling effect: reduce thermal energy by (LnCoolFactor) * dt
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LThermalEnergy = (LThermalEnergy * math.exp(LnCoolFactor * dt)) + (L_Thrust * dt);
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}
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}
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RThermalEnergy += (Mass * (math.pow(V1, 2) - math.pow(V2_R, 2)) / 2);
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if (getprop("services/chocks/right"))
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{
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if (!getprop("controls/gear/brake-parking"))
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{
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# cooling effect: reduce thermal energy by (RnCoolFactor) * dt
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RThermalEnergy = RThermalEnergy * math.exp(RnCoolFactor * dt);
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} else {
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#RThermalEnergy += math.abs(R_Thrust);
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# cooling effect: reduce thermal energy by (RnCoolFactor) * dt
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RThermalEnergy = (RThermalEnergy * math.exp(RnCoolFactor * dt)) + (R_Thrust * dt);
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}
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} else {
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if (!getprop("controls/gear/brake-parking"))
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{
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if (RBrakeLevel>0)
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{
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if (V2_R>0)
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{
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#RThermalEnergy += (Mass * (math.pow(V1, 2) - math.pow(V2_R, 2)) / 2) + R_thrust;
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# cooling effect: reduce thermal energy by (RnCoolFactor) * dt
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RThermalEnergy = RThermalEnergy * math.exp(RnCoolFactor * dt);
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} else {
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#RThermalEnergy += math.abs(R_Thrust);
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# cooling effect: reduce thermal energy by (RnCoolFactor) * dt
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RThermalEnergy = (RThermalEnergy * math.exp(RnCoolFactor * dt)) + (R_Thrust * dt);
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}
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} else {
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# cooling effect: reduce thermal energy by (RnCoolFactor) * dt
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RThermalEnergy = RThermalEnergy * math.exp(RnCoolFactor * dt);
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}
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} else {
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#RThermalEnergy += math.abs(R_Thrust);
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# cooling effect: reduce thermal energy by (RnCoolFactor) * dt
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RThermalEnergy = (RThermalEnergy * math.exp(RnCoolFactor * dt)) + (R_Thrust * dt);
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}
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}
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} else {
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LThermalEnergy = LThermalEnergy * math.exp(LnCoolFactor * dt);
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RThermalEnergy = RThermalEnergy * math.exp(RnCoolFactor * dt);
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}
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if (LThermalEnergy < 0) {
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LThermalEnergy = 0
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}
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|
|
|
|
if (LThermalEnergy > 3) {
|
|
|
|
|
LThermalEnergy = 3
|
|
|
|
|
}
|
|
|
|
|
if (RThermalEnergy < 0) {
|
|
|
|
|
RThermalEnergy = 0
|
|
|
|
|
}
|
|
|
|
|
if (RThermalEnergy > 3) {
|
|
|
|
|
RThermalEnergy = 3
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
setprop("gear/gear[1]/L-Thrust",L_Thrust);
|
|
|
|
|
setprop("gear/gear[2]/R-Thrust",R_Thrust);
|
2020-01-04 22:36:43 +00:00
|
|
|
setprop("gear/gear[1]/Lbrake-thermal-energy",LThermalEnergy);
|
|
|
|
|
setprop("gear/gear[2]/Rbrake-thermal-energy",RThermalEnergy);
|
2019-12-02 18:25:19 +00:00
|
|
|
|
2020-01-04 22:36:43 +00:00
|
|
|
#Calculating Brakes temperature
|
2020-01-27 18:01:33 +00:00
|
|
|
setprop("gear/gear[1]/L1brake-temp-degc",tatdegc+getprop("gear/gear[1]/L1error-temp-degc")+(LThermalEnergy * (300-tatdegc-getprop("gear/gear[1]/L1error-temp-degc"))));
|
|
|
|
|
setprop("gear/gear[1]/L2brake-temp-degc",tatdegc+getprop("gear/gear[1]/L2error-temp-degc")+(LThermalEnergy * (300-tatdegc-getprop("gear/gear[1]/L2error-temp-degc"))));
|
|
|
|
|
setprop("gear/gear[2]/R3brake-temp-degc",tatdegc+getprop("gear/gear[2]/R3error-temp-degc")+(RThermalEnergy * (300-tatdegc-getprop("gear/gear[2]/R3error-temp-degc"))));
|
|
|
|
|
setprop("gear/gear[2]/R4brake-temp-degc",tatdegc+getprop("gear/gear[2]/R4error-temp-degc")+(RThermalEnergy * (300-tatdegc-getprop("gear/gear[2]/R4error-temp-degc"))));
|
2020-01-04 22:36:43 +00:00
|
|
|
setprop("gear/gear[1]/L1brake-temp-degf",(32 + (1.8 * getprop("gear/gear[1]/L1brake-temp-degc"))));
|
|
|
|
|
setprop("gear/gear[1]/L2brake-temp-degf",(32 + (1.8 * getprop("gear/gear[1]/L2brake-temp-degc"))));
|
|
|
|
|
setprop("gear/gear[2]/R3brake-temp-degf",(32 + (1.8 * getprop("gear/gear[2]/R3brake-temp-degc"))));
|
|
|
|
|
setprop("gear/gear[2]/R4brake-temp-degf",(32 + (1.8 * getprop("gear/gear[2]/R4brake-temp-degc"))));
|
2019-12-02 18:25:19 +00:00
|
|
|
|
|
|
|
|
if ((LThermalEnergy>1)and(!me.LSmokeActive))
|
|
|
|
|
{
|
|
|
|
|
# start smoke processing
|
|
|
|
|
me.LSmokeActive = 1;
|
|
|
|
|
settimer(func { BrakeSys.Lsmoke(); },0);
|
|
|
|
|
}
|
|
|
|
|
if ((RThermalEnergy>1)and(!me.RSmokeActive))
|
|
|
|
|
{
|
|
|
|
|
# start smoke processing
|
|
|
|
|
me.RSmokeActive = 1;
|
|
|
|
|
settimer(func { BrakeSys.Rsmoke(); },0);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
me.LastSimTime = CurrentTime;
|
|
|
|
|
# 5 updates per second are good enough
|
|
|
|
|
settimer(func { BrakeSys.update(); },0.2);
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
# smoke processing
|
|
|
|
|
Lsmoke : func()
|
|
|
|
|
{
|
2020-01-04 22:36:43 +00:00
|
|
|
if ((me.LSmokeActive)and(getprop("gear/gear[1]/Lbrake-thermal-energy")>1))
|
2019-12-02 18:25:19 +00:00
|
|
|
{
|
|
|
|
|
# make density of smoke effect depend on energy level
|
|
|
|
|
var LSmokeDelay=0;
|
2020-01-04 22:36:43 +00:00
|
|
|
var LThermalEnergy = getprop("gear/gear[1]/Lbrake-thermal-energy");
|
2019-12-02 18:25:19 +00:00
|
|
|
if (LThermalEnergy < 1.5)
|
|
|
|
|
LSmokeDelay=(1.5-LThermalEnergy);
|
|
|
|
|
# No smoke when gear retracted
|
|
|
|
|
var LSmokeValue = (getprop("gear/gear[1]/position-norm")>0.5);
|
|
|
|
|
# toggle smoke to interpolate different densities
|
|
|
|
|
if (LSmokeDelay>0.05)
|
|
|
|
|
{
|
|
|
|
|
me.LSmokeToggle = !me.LSmokeToggle;
|
|
|
|
|
if (!me.LSmokeToggle)
|
|
|
|
|
LSmokeValue = 0;
|
|
|
|
|
else
|
|
|
|
|
LSmokeDelay = 0;
|
|
|
|
|
}
|
2020-01-04 22:36:43 +00:00
|
|
|
setprop("gear/gear[1]/Lbrake-smoke",LSmokeValue);
|
2019-12-02 18:25:19 +00:00
|
|
|
settimer(func { BrakeSys.Lsmoke(); },LSmokeDelay);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
# stop smoke processing
|
2020-01-04 22:36:43 +00:00
|
|
|
setprop("gear/gear[1]/Lbrake-smoke",0);
|
2019-12-02 18:25:19 +00:00
|
|
|
setprop("sim/animation/fire-services",0);
|
|
|
|
|
me.LSmokeActive = 0;
|
|
|
|
|
}
|
2020-01-04 22:36:43 +00:00
|
|
|
if (getprop("gear/gear[1]/Lbrake-thermal-energy") > 1.5)
|
2019-12-02 18:25:19 +00:00
|
|
|
setprop("sim/animation/fire-services",1);
|
|
|
|
|
else
|
|
|
|
|
setprop("sim/animation/fire-services",0);
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
# smoke processing
|
|
|
|
|
Rsmoke : func()
|
|
|
|
|
{
|
2020-01-04 22:36:43 +00:00
|
|
|
if ((me.RSmokeActive)and(getprop("gear/gear[2]/Rbrake-thermal-energy")>1))
|
2019-12-02 18:25:19 +00:00
|
|
|
{
|
|
|
|
|
# make density of smoke effect depend on energy level
|
|
|
|
|
var RSmokeDelay=0;
|
2020-01-04 22:36:43 +00:00
|
|
|
var RThermalEnergy = getprop("gear/gear[2]/Rbrake-thermal-energy");
|
2019-12-02 18:25:19 +00:00
|
|
|
if (RThermalEnergy < 1.5)
|
|
|
|
|
RSmokeDelay=(1.5-RThermalEnergy);
|
|
|
|
|
# No smoke when gear retracted
|
|
|
|
|
var RSmokeValue = (getprop("gear/gear[2]/position-norm")>0.5);
|
|
|
|
|
# toggle smoke to interpolate different densities
|
|
|
|
|
if (RSmokeDelay>0.05)
|
|
|
|
|
{
|
|
|
|
|
me.RSmokeToggle = !me.RSmokeToggle;
|
|
|
|
|
if (!me.RSmokeToggle)
|
|
|
|
|
RSmokeValue = 0;
|
|
|
|
|
else
|
|
|
|
|
RSmokeDelay = 0;
|
|
|
|
|
}
|
2020-01-04 22:36:43 +00:00
|
|
|
setprop("gear/gear[2]/Rbrake-smoke",RSmokeValue);
|
2019-12-02 18:25:19 +00:00
|
|
|
settimer(func { BrakeSys.Rsmoke(); },RSmokeDelay);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
# stop smoke processing
|
2020-01-04 22:36:43 +00:00
|
|
|
setprop("gear/gear[2]/Rbrake-smoke",0);
|
2019-12-02 18:25:19 +00:00
|
|
|
me.RSmokeActive = 0;
|
|
|
|
|
}
|
2020-01-04 22:36:43 +00:00
|
|
|
if (getprop("gear/gear[2]/Rbrake-thermal-energy") > 1.5)
|
2019-12-02 18:25:19 +00:00
|
|
|
setprop("sim/animation/fire-services",1);
|
|
|
|
|
else
|
|
|
|
|
setprop("sim/animation/fire-services",0);
|
|
|
|
|
},
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
var BrakeSys = BrakeSystem.new();
|
|
|
|
|
|
|
|
|
|
setlistener("sim/signals/fdm-initialized",
|
|
|
|
|
# executed on _every_ FDM reset (but not installing new listeners)
|
|
|
|
|
func(idle) { BrakeSys.reset(); },
|
|
|
|
|
0,0);
|
|
|
|
|
|
|
|
|
|
settimer(func()
|
|
|
|
|
{
|
|
|
|
|
BrakeSys.update();
|
|
|
|
|
}, 5);
|
