Impulse 9

[Marilina Crawn]

Theterm "impulse" is also used to refer to a fast-acting force or impact. This type of impulse is often idealized so that the change in momentum produced by the force happens with no change in time. This sort of change is a step change, and is not physically possible. However, this is a useful model for computing the effects of ideal collisions (such as in videogame physics engines). Additionally, in rocketry, the term "total impulse" is commonly used and is considered synonymous with the term "impulse".

The application of Newton's second law for variable mass allows impulse and momentum to be used as analysis tools for jet- or rocket-propelled vehicles. In the case of rockets, the impulse imparted can be normalized by unit of propellant expended, to create a performance parameter, specific impulse. This fact can be used to derive the Tsiolkovsky rocket equation, which relates the vehicle's propulsive change in velocity to the engine's specific impulse (or nozzle exhaust velocity) and the vehicle's propellant-mass ratio.

During the envlp sweeps, I see that the first simulation takes about 40 minutes to for spectre to complete (including calculattion/create impulse response bin files) while the following steps in the sweep take no more than couple of minutes (useing the models). But with no changes/updates of the schematic/N-ports/netlist, on the next sweep once again the first simulation takes about 40 minutes and all the bin files are re-generated on the first run.

If I understand your question correctly, I think the option to save the impulse response files spectre creates from an S-parameter N-port file already exists and may be selected either through the GUI or through options set in either your .cdsinit file or .cdsenv file.

I'm using a WinXP machine connected to PCI-6024E and AT-MIO-16E-10. The whole setup is supposed to drive a DC motor and I'm supposed to design an experiment to input an impulse signal to the system and get an impulse/step response. I have to be able to define the width of the impulse signal.

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