Rainbow + ODEcalc + CurvFit Software 4 Engineers & Scientists
 Reg. $0.00

Fortran Calculus - Ordinary Differential Equations
 Reg. $1,000,000.00
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Problem-Solving Suggestion

Need a Sinewave Removed?

    Sinewave removal or extraction from ones data is a two-step process that requires our CurvFit and Rainbow software. Here is a procedure to remove sinewaves from digital data:
    1. First execute Rainbow to find what are your key frequencies. For example, say Rainbow shows two key frequencies. Take these two frequencies as starting values for CurvFit's 'sine' model (question #10 input). Setup CurvFit to match these two frequencies against your data (lets call your data file A1).
    2. If CurvFit converges okay, then your CurvFit Error plot should be called A2 (i.e. A2 = A1 - n * Sinewaves) where 'n' is number of sinewaves removed (n = 2 in this example). Your error data is located in your '~4plots.dat' file. It is the third column. Delete or comment out the first few lines up to where the 4 column data begins. Then delete columns 2 and 4. Save the remaining save data as your 'A2' file.
    3. If A2 data still shows a sinewave is involved, run Rainbow on A2 data and find what other frequencies are involved. Say Rainbow finds one more frequency from A2 data. Add this frequency to your CurvFit input (question #10) parameters. Now this example would have 3 frequencies. The A1 data is still in use as you rerun CurvFit. An edited CurvFit Error plot (see '~4plots.dat' file) will be your new A2 data file. If this new A2 data still shows sinusoidal ripple then back to the beginning of this pharagraph you go. (Warning: CurvFit does a least-square error fit to converge that looks like a ripple. Can't remove this ripple!)
    Once you make it here, A2 data is your A1 data minus 'n' sinewaves.

    Description Price
1.   Rainbow + CurvFit Software Bundle 4 Engineers & Scientists $0.00
2.   Rainbow + ODEcalc + CurvFit Software 4 Engineers & Scientists $0.00
3.   Match-n-Freq + Rainbow + CurvFit Software 4 Filter Designing $433.00
All prices in US Dollars

Problem-Solving Application Examples include:

CurvFit: a curve fitting program with Lorentzian, Sine, Exponential and Power series are available models to match your data.

ODEcalc: an Ordinary Differential Equation Calculator! Solves BVP & IVP.

Match-n-Freq: a Matched Filter program used to filter signals and slim pulses.

Robot4: Robotic Arm Movement; determines how to get from a point to another point.

Industry Problem-Solving Descriptions include:

AC Motor Design: a simulation program for A.C. motor design that was reapplied as a constrained optimization problem with 12 unknown parameters and 7 constraints.

Body Plasma Chemistry: determine the concentration of a Therapeutic treatment drug that is in the body over a period of time.

Efficient Solar Cells: Modeling a Nanostructured Solar Cell. Problem: How to develop solar cells with a new (higher) efficiency; grätzel cells.

Pulse Slimming to minimize InterSymbol Interference: via Arbitrary Equalization with Simple LC Structures to reduce errors.

Voice Coil Motor: basically an electromagnetic transducer in which a coil placed in a magnetic pole gap experiences a force proportional to the current passing through the coil.

Heat Transfer Boundary Value Problem: Solves second order Differential Equation for temperature distribution in a tapered fin.

Electrical Filter Design: find the transfer function's poles & zeros; H(s) = Yout(s) / Yin(s).

Digitized Signal from Magnetic Recording: Magnetic recording of transitions written onto a computer disc drive may produce an isolated pulse as shown.

PharmacoKinetics: an open-two- compartment model with first order absorption into elimination from central compartment is presented here.

Rocket Feed System: illustrates solving implicit differential equations that model a liquid propellant rocket feed system in the presence of a longitudinal vibration.


 
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