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cusf-standalone-predictor/predict/js/calc/calc.js

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10 KiB
JavaScript
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function get_value(id) {
return parseFloat(document.getElementById(id).value);
}
function clear_errors() {
var ids = ['mp', 'tar', 'tba', 'rho_g', 'rho_a', 'adm', 'bd', 'cd',
'bd_c', 'cd_c'];
for(var i in ids) {
document.getElementById(ids[i]).style.backgroundColor = '';
}
var ids = ['mp_w', 'mb_w', 'tar_w', 'tba_w'];
for(i in ids) {
document.getElementById(ids[i]).innerHTML = ' ';
}
}
function show_error(id) {
document.getElementById(id).style.backgroundColor = '#f99';
}
function set_error(id, error) {
show_error(id);
document.getElementById(id+"_w").innerHTML = error;
}
function sanity_check_inputs(mb, mp, mp_set, tar, tba, tar_set, tba_set) {
if(tar_set && tba_set) {
set_error('tar', "Can't specify both!");
set_error('tba', "Can't specify both!");
return 1;
} else if(!tar_set && !tba_set) {
set_error('tar', "Must specify at least one!");
set_error('tba', "Must specify at least one!");
return 1;
}
if(tar_set && tar < 0) {
set_error('tar', "Can't be negative!");
return 1;
} else if(tar_set && tar > 10) {
set_error('tar', "Too large! (> 10m/s)");
return 1;
}
if(tba_set && tba < 10000) {
set_error('tba', "Too low! (< 10km)");
return 1;
} else if(tba_set && tba > 40000) {
set_error('tba', "Too high! (> 40km)");
return 1;
}
if(!mp_set) {
set_error('mp', "Mass required!");
return 1;
} else if(mp < 20) {
set_error('mp', "Too small! (< 20g)");
return 1;
} else if(mp > 5000) {
set_error('mp', "Too large! (> 5kg)");
return 1;
}
return 0;
}
function sanity_check_constants(rho_g, rho_a, adm, ga, bd, cd) {
if(!rho_a || rho_a < 0) {
show_error('rho_a');
return 1;
}
if(!rho_g || rho_g < 0 || rho_g > rho_a) {
show_error('rho_g');
return 1;
}
if(!adm || adm < 0) {
show_error('adm');
return 1;
}
if(!ga || ga < 0) {
show_error('ga');
return 1;
}
if(!cd || cd < 0 || cd > 1) {
show_error('cd');
return 1;
}
if(!bd || bd < 0) {
show_error('bd');
return 1;
}
return 0;
}
function find_rho_g() {
var gas = document.getElementById('gas').value;
var rho_g;
switch(gas) {
case 'he':
rho_g = 0.1786;
document.getElementById('rho_g').value = rho_g;
document.getElementById('rho_g').disabled = "disabled";
break;
case 'h':
rho_g = 0.0899;
document.getElementById('rho_g').value = rho_g;
document.getElementById('rho_g').disabled = "disabled";
break;
case 'ch4':
rho_g = 0.6672;
document.getElementById('rho_g').value = rho_g;
document.getElementById('rho_g').disabled = "disabled";
break;
default:
document.getElementById('rho_g').disabled = "";
rho_g = get_value('rho_g');
break;
}
return rho_g;
}
function find_bd(mb) {
var bds = new Array();
// From Kaymont Totex Sounding Balloon Data
bds["k200"] = 3.00;
bds["k300"] = 3.78;
bds["k350"] = 4.12;
bds["k450"] = 4.72;
bds["k500"] = 4.99;
bds["k600"] = 6.02;
bds["k700"] = 6.53;
bds["k800"] = 7.00;
bds["k1000"] = 7.86;
bds["k1200"] = 8.63;
bds["k1500"] = 9.44;
bds["k2000"] = 10.54;
bds["k3000"] = 13.00;
// Hwoyee data from http://www.hwoyee.com/base.asp?ScClassid=521&id=521102
bds["h200"] = 3.00;
bds["h300"] = 3.80;
bds["h350"] = 4.10;
bds["h400"] = 4.50;
bds["h500"] = 5.00;
bds["h600"] = 5.80;
bds["h750"] = 6.50;
bds["h800"] = 6.80;
bds["h950"] = 7.20;
bds["h1000"] = 7.50;
bds["h1200"] = 8.50;
bds["h1500"] = 9.50;
bds["h1600"] = 10.50;
bds["h2000"] = 11.00;
// PAWAN data from
// https://sites.google.com/site/balloonnewswebstore/1200g-balloon-data
bds["p1200"] = 8.0;
var bd_c = document.getElementById('bd_c').checked;
var bd;
if(bd_c) {
bd = get_value('bd');
document.getElementById('bd').disabled = "";
} else {
bd = bds[mb];
document.getElementById('bd').disabled = "disabled";
document.getElementById('bd').value = bd;
}
return bd;
}
function find_cd(mb) {
var cds = new Array();
// From Kaymont Totex Sounding Balloon Data
cds["k200"] = 0.25;
cds["k300"] = 0.25;
cds["k350"] = 0.25;
cds["k450"] = 0.25;
cds["k500"] = 0.25;
cds["k600"] = 0.30;
cds["k700"] = 0.30;
cds["k800"] = 0.30;
cds["k1000"] = 0.30;
cds["k1200"] = 0.25;
cds["k1500"] = 0.25;
cds["k2000"] = 0.25;
cds["k3000"] = 0.25;
// Hwoyee data just guesswork
cds["h200"] = 0.25;
cds["h300"] = 0.25;
cds["h350"] = 0.25;
cds["h400"] = 0.25;
cds["h500"] = 0.25;
cds["h600"] = 0.30;
cds["h750"] = 0.30;
cds["h800"] = 0.30;
cds["h950"] = 0.30;
cds["h1000"] = 0.30;
cds["h1200"] = 0.25;
cds["h1500"] = 0.25;
cds["h1600"] = 0.25;
cds["h2000"] = 0.25;
// PAWAN data also guesswork
cds["p1200"] = 0.25;
var cd_c = document.getElementById('cd_c').checked;
var cd;
if(cd_c) {
cd = get_value('cd');
document.getElementById('cd').disabled = "";
} else {
cd = cds[mb];
document.getElementById('cd').disabled = "disabled";
document.getElementById('cd').value = cd;
}
return cd;
}
function calc_update() {
// Reset error status
clear_errors();
// Get input values and check them
var mb = document.getElementById('mb').value;
var mp = get_value('mp');
var tar = get_value('tar');
var tba = get_value('tba');
var mp_set = 0;
var tar_set = 0;
var tba_set = 0;
if(document.getElementById('mp').value)
mp_set = 1;
if(document.getElementById('tar').value)
tar_set = 1;
if(document.getElementById('tba').value)
tba_set = 1;
if(sanity_check_inputs(mb, mp, mp_set, tar, tba, tar_set, tba_set))
return;
// Get constants and check them
var rho_g = find_rho_g();
var rho_a = get_value('rho_a');
var adm = get_value('adm');
var ga = get_value('ga');
var bd = find_bd(mb);
var cd = find_cd(mb);
if(sanity_check_constants(rho_g, rho_a, adm, ga, bd, cd))
return;
// Do some maths
mb = parseFloat(mb.substr(1)) / 1000.0;
mp = mp / 1000.0;
var ascent_rate = 0;
var burst_altitude = 0;
var time_to_burst = 0;
var neck_lift = 0;
var launch_radius = 0;
var launch_volume = 0;
var burst_volume = (4.0/3.0) * Math.PI * Math.pow(bd / 2.0, 3);
if(tba_set) {
launch_volume = burst_volume * Math.exp((-tba) / adm);
launch_radius = Math.pow((3*launch_volume)/(4*Math.PI), (1/3));
} else if(tar_set) {
var a = ga * (rho_a - rho_g) * (4.0 / 3.0) * Math.PI;
var b = -0.5 * Math.pow(tar, 2) * cd * rho_a * Math.PI;
var c = 0;
var d = - (mp + mb) * ga;
var f = (((3*c)/a) - (Math.pow(b, 2) / Math.pow(a,2)) / 3.0);
var g = (
((2*Math.pow(b,3))/Math.pow(a,3)) -
((9*b*c)/(Math.pow(a,2))) + ((27*d)/a) / 27.0
);
var h = (Math.pow(g,2) / 4.0) + (Math.pow(f,3) / 27.0);
if(h>0) {
// One real root. This is what should happen.
var R = (-0.5 * g) + Math.sqrt(h);
var S = Math.pow(R, 1.0/3.0);
var T = (-0.5 * g) - Math.sqrt(h);
var U = Math.pow(T, 1.0/3.0);
launch_radius = (S+U) - (b/(3*a));
} else if(f==0 && g==0 && h==0) {
// Three real and equal roots
// Will this ever even happen?
launch_radius = -1 * Math.pow(d/a, 1.0/3.0);
} else if(h <= 0) {
// Three real and different roots
// What the hell do we do?!
// It needs trig! fffff
var i = Math.sqrt((Math.pow(g,2)/4.0) - h);
var j = Math.pow(i, 1.0/3.0);
var k = Math.acos(-g / (2*i));
var L = -1 * j;
var M = Math.cos(K/3.0);
var N = Math.sqrt(3) * Math.sin(K/3.0);
var P = (b/(3*a)) * -1;
var r1 = 2*j*Math.cos(k/3.0) - (b/(3*a));
var r2 = L * (M + N) + P;
var r3 = L * (M - N) + P;
alert("Three possible solutions found: "
+ r1 + ", " + r2 + ", " + r3);
if(r1 > 0) {
launch_radius = r1;
} else if(r2 > 0) {
launch_radius = r2;
} else if(r3 > 0) {
launch_radius = r3;
}
} else {
// No real roots
}
}
var launch_area = Math.PI * Math.pow(launch_radius, 2);
var launch_volume = (4.0/3.0) * Math.PI * Math.pow(launch_radius, 3);
var density_difference = rho_a - rho_g;
var gross_lift = launch_volume * density_difference;
neck_lift = (gross_lift - mb) * 1000;
var total_mass = mp + mb;
var free_lift = (gross_lift - total_mass) * ga;
ascent_rate = Math.sqrt(free_lift / (0.5 * cd * launch_area * rho_a));
var volume_ratio = launch_volume / burst_volume;
burst_altitude = -(adm) * Math.log(volume_ratio);
time_to_burst = (burst_altitude / ascent_rate) / 60.0;
if(isNaN(ascent_rate)) {
set_error('tba', "Altitude unreachable<br />for this configuration.");
return;
}
ascent_rate = ascent_rate.toFixed(2);
burst_altitude = burst_altitude.toFixed();
time_to_burst = time_to_burst.toFixed();
neck_lift = neck_lift.toFixed();
launch_litres = (launch_volume * 1000).toFixed();
launch_cf = (launch_volume * 35.31).toFixed(1);
launch_volume = launch_volume.toFixed(2);
document.getElementById('ar').innerHTML = ascent_rate;
document.getElementById('ba').innerHTML = burst_altitude;
document.getElementById('ttb').innerHTML = time_to_burst + " min";
document.getElementById('nl').innerHTML = neck_lift + " g";
document.getElementById('lv_m3').innerHTML = launch_volume + " m<sup>3</sup>";
document.getElementById('lv_l').innerHTML = launch_litres + " L";
document.getElementById('lv_cf').innerHTML = launch_cf + " ft<sup>3</sup>";
}
function calc_init() {
var ids = ['mb', 'mp', 'tar', 'tba', 'gas', 'rho_g', 'rho_a', 'adm', 'bd', 'cd', 'bd_c', 'cd_c'];
for(var i in ids) {
document.getElementById(ids[i]).onchange = calc_update;
}
calc_update();
}
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