How to Solve This 2nd Order ODE in Control Systems?

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SUMMARY

The discussion focuses on solving a second-order ordinary differential equation (ODE) in control systems, specifically with parameters Km = 0.5, K2 = 0.03, K1 = 0.05, and x* = 49. The auxiliary equation and general solution can be derived by assuming C_m = e^(kt) and substituting the given parameters. The values of τ (time constant) and ζ (damping ratio) are also critical in determining the system's behavior, and it is recommended to substitute parameter values for clarity in the equation.

PREREQUISITES
  • Understanding of second-order ordinary differential equations (ODEs)
  • Familiarity with control systems terminology
  • Knowledge of exponential functions and their applications in differential equations
  • Basic concepts of damping ratio (ζ) and time constant (τ)
NEXT STEPS
  • Study the derivation of the auxiliary equation for second-order ODEs
  • Learn about the significance of time constant (τ) and damping ratio (ζ) in control systems
  • Explore analytical methods for solving ordinary differential equations
  • Investigate the application of parameter substitution in simplifying differential equations
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Control systems engineers, students studying differential equations, and professionals involved in system dynamics and stability analysis.

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I'm trying to solve this equation analytically, but I can't even find the auxiliary equation or general solution!

View attachment 1867

Km = 0.5
C*e = 0
K2 = 0.03
K1 = 0.05
x* = 49
 

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What is $\tau$ and what is $\zeta$? If they do not depend on $t$, then this equation is fairly straight-forward (just assume $C_{m}=e^{kt}$, plug in, and solve for $k$, followed by finding a particular solution of the form $C_{m}=A$.)
 
I'd also advise substituting the values for your parameters, the equation will be much easier to read at least...
 

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