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Code Issues Releases Activity

OP-1351 now use Newton's law of cooling to simulate temperature rise

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This commit is contained in:
Philippe Renon 2014-06-11 01:11:18 +02:00
parent e596f2ea90
commit 67ff2e58b8
1 changed files with 10 additions and 2 deletions
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12
ground/openpilotgcs/src/plugins/config/calibration/thermal/thermalcalibrationhelper.cpp
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@ -31,6 +31,8 @@
#include <uavtalk/telemetrymanager.h>
#include "version_info/version_info.h"
#include <math.h>
// #define SIMULATE
namespace OpenPilot {
@ -263,8 +265,14 @@ float ThermalCalibrationHelper::getTemperature()
{
#ifdef SIMULATE
float t = m_startTime.msecsTo(QTime::currentTime()) / 1000.0f;
// simulate a temperature rise from 20°C to 40°C
return 40 - 20 / (t + 1);
// Simulate a temperature rise using Newton's law of cooling
// See http://en.wikipedia.org/wiki/Newton%27s_law_of_cooling#Newton.27s_law_of_cooling
// Initial temp : 20
// Final temp : 40
// Made up time constant (t0) : 10.0
// For a plot of the function, see http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiI0MC0yMCplXigteC8xMCkiLCJjb2xvciI6IiMwMDAwMDAifSx7InR5cGUiOjEwMDAsIndpbmRvdyI6WyItOTIuMjAzMjYzMTkzMzY4ODMiLCI5Ni45NzE2MzQ3NzU0MDAwOCIsIi00NC4zNzkzODMzMjU1NzY3NTQiLCI3Mi4wMzU5Mzg1MDEzNTc5OSJdfV0-
double t0 = 10.0;
return 40.0 - 20.0 * exp(-t / t0);
#else
return baroSensor->getTemperature();