On Sat, 23 Apr 2005 10:15:31 +0100, Vivian wrote in message <[EMAIL PROTECTED]>:
> Andy Ross wrote > > > > > Drew wrote: > > > IMHO, it's best to use interpolation tables rather than equations > > > if you're trying to curve fit empirical data. > > > > Not in this context. The data here isn't being used to model a > > specific engine, but to provide sane parameters for all > > (super/turbochared) engines. The performance and code size > > advantages of an equation here are significant. > > > > At the moment we are looking at gear driven centrifugal compressors. > Although I haven't researched it in any detail, the output of > turbo-driven centrifugal compressors do not have a direct relationship > with rpm (turbo lag), and the situation is complicated by the > wastegate which operates on the turbo rather than the compressor. I > suspect that this is another black art! Gear driven is easy in > comparison. When someone comes up with a turbo we may have to have > separate models. ..if your supercharger code takes shaft input (shaft speed, torque or power), then it can be re-used in the turbocharger's compressor code. ..the turbocharger's compressor or turbo-compound engine's crankshaft then only needs a turbine derivering shaft outnput (shaft speed, torque or power) to the compressor or gear box. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
