Download e-book for iPad: Advanced Dynamic-system Simulation: Model-replication by Granino A. Korn

By Granino A. Korn

ISBN-10: 0470081880

ISBN-13: 9780470081884

Examine the most recent concepts in programming refined simulation platforms. This state of the art textual content offers the most recent ideas in complex simulation programming for interactive modeling and simulation of dynamic structures, corresponding to aerospace autos, keep watch over structures, and organic platforms. the writer, a number one authority within the box, demonstrates software program that may deal with huge simulation reports on general own pcs.

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Extra resources for Advanced Dynamic-system Simulation: Model-replication Techniques and Monte Carlo Simulation

Example text

This is precisely why we wrote each difference equation (2-1b) as an assignment to a “predictor variable” Qi rather than to qi. It is always safe to rewrite difference equations such as (2-2) as Qi = Fi(t; q1, q2, …; p1, p2, …) and to program updating assignments qi = Qi following the difference equations as in Section 2-1. info Sampled-data Assignments and Difference Equations 35 + 0 – 0 scale =4 400 q1 vs. 90 t = 0 | q1 = 0 | q2 = 1 drun -----------------------------------------------------------------DYNAMIC -----------------------------------------------------------------SAMPLE 10 | -for better display only Q1 = q2 | Q2 = a*q2 + b * q1 | -- difference eqs.

The program in Figure 2-4 models digital PID (proportional/integral/ derivative) control [1] of an analog plant represented by differential equations similar to those for the servo in Section 1-14, that is, torque = maxtrq * tanh(y/maxtrq) d/dt c = cdot d/dt cdot = 10 * torque – R * cdot Torque saturation is again represented by the tanh function. The program neglects analog-to-digital converter quantization, but this could be implemented as shown in Section 2-15. The simulated digital controller samples the analog input u and the analog output c (this models analog-to-digital conversion) to produce the sampleddata variable error.

But crowding (b > 0) limits the predator population, and both populations converge to steady-state values. 1-13. Splicing Multiple Simulation Runs: Billiard-ball Simulation The DYNAMIC program segment in Figure 1-7 models a billiard ball as a point (x, y) on a table bounded by elastic barriers at x = a, x = – a, y = b, and y = – b. For x, y within the barriers, the only acceleration is due to constant friction in the negative velocity direction, so that we program d/dt x = xdot | d/dt y = ydot d/dt xdot = – fric * xdot/v | d/dt ydot = – fric * ydot/v where the velocity v is obtained with the defined-variable assignment v = sqrt(xdot^2 + ydot^2) A differential-equation model of barrier impacts would need to formulate elastic and dissipative forces produced as the ball penetrates each barrier.

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Advanced Dynamic-system Simulation: Model-replication Techniques and Monte Carlo Simulation by Granino A. Korn

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