- #1
SF2K4
- 7
- 0
Ok, so while I understand 2nd Order ODEs... I really don't understand MATLAB.
I have 2 questions that I just can't get any code to work for:
1
Question: Consider the model of an undampened spring-mass system with a time-dependent spring constant k(t) given by:
d2y/dt2 + k(t)y = 0,
Use the ODE45-solver to obtain the solution curves satisfying the initial conditions on interval [0, 100] and function k(t). Predict the behavios as t approaches infinity and discuss the nature of the oscillations (if any)
1) y(0) = 1, y'(0) = 1, k(t) = cos(t)
2) y(0) = 1, y'(0) = 1, k(t) = 1+t^2
---------------
2
Question: Consider the following model for a linear mass-spring system with damping and forcing:
d2y/dt2 + (1/5)(dy/dt) + (1/5)y = coswt, y(0) = 0, y'(0) = 0
1) Use ODE45-solver to obtain the solution curves for values of w = 0.5, 1, 1.5, 2. Plot the solutions and estimate the amplitude A of the steady response in each case.
2) Using the data from part 1), plot the graph of A versus w. For what w is the amplitude greatest?
---------------
I know how to use ODE45 to solve a 1st Order ODE and I know how to use other parts of MATLAB (tspan, y0, plot, etc.) but I have no idea how to approach this problem (mainly due to the 2nd Order ODE) nor has my professor been the best teacher when it comes to MATLAB.
Thanks!
I have 2 questions that I just can't get any code to work for:
1
Question: Consider the model of an undampened spring-mass system with a time-dependent spring constant k(t) given by:
d2y/dt2 + k(t)y = 0,
Use the ODE45-solver to obtain the solution curves satisfying the initial conditions on interval [0, 100] and function k(t). Predict the behavios as t approaches infinity and discuss the nature of the oscillations (if any)
1) y(0) = 1, y'(0) = 1, k(t) = cos(t)
2) y(0) = 1, y'(0) = 1, k(t) = 1+t^2
---------------
2
Question: Consider the following model for a linear mass-spring system with damping and forcing:
d2y/dt2 + (1/5)(dy/dt) + (1/5)y = coswt, y(0) = 0, y'(0) = 0
1) Use ODE45-solver to obtain the solution curves for values of w = 0.5, 1, 1.5, 2. Plot the solutions and estimate the amplitude A of the steady response in each case.
2) Using the data from part 1), plot the graph of A versus w. For what w is the amplitude greatest?
---------------
I know how to use ODE45 to solve a 1st Order ODE and I know how to use other parts of MATLAB (tspan, y0, plot, etc.) but I have no idea how to approach this problem (mainly due to the 2nd Order ODE) nor has my professor been the best teacher when it comes to MATLAB.
Thanks!