Jon S. Berndt wrote: >> В сообщении от 9 Ноябрь 2006 09:21 Jon S. Berndt написал(a): >> >>> The philosophy behind our propulsion system is to provide a decent >>> perception of propulsive forces applied to the aircraft - not an >>> engineering simulation of an engine. With that said, improvements to the >>> engine model are always something we are interested in. >>> >> May I take some question? >> >> What is a parameter "displacement" in engine xml file? It tune heating of >> cylinder heat? >> >> There are dampers for change air flow, in air-cooled engine. How >> I can change >> cool degrees in JSBsim engine model? >> >> I write dampers gauges and handles for An-2 model, but I don't >> know how it >> apply to engine. >> >> >> Thanks! >> -- >> Wbr, Yurik >> > > Hi, Yurik: > > These might be questions to ask in the JSBSim developers list. Dave Luff > developed our piston engine. I'll try to answer this, but Dave is the best > one to ask. > > Jon > > Hi Yurik, Jon,
Displacement is the swept volume of the cylinders, eg. 1.6 litres for a 1.6 litre auto engine. I'm working from memory right now, but the cylinder temperature model is a simple 1D lumped capacity model IIRC, dependent on the rate of heat generation within the engine and the rate of airflow over it. I tuned it so that the C172 would get into the red on the guage if climbed out at max power mixture, but would stay in the green if the mixture was set rich for climb, but I don't think the CHT guage made it onto the panel by default, so the model has had no TLC or feedback over the years. If the displacement is an input, then I suspect it was an attempt to non-dimensionalise engine size within the model, to make it valid for any similar piston engine. I'll take a look and try and be more helpful... Cheers - Dave ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
