Consider the schematic of the single pendulum. m The kinetic energy T and potential energy V may be written as: T = = ml²j² V = -gml cos(6) d al dt ə The Lagrangian L is given by L=T-V, and the Euler-Lagrange equations for the motion of the pendulum are given by the following second order differential equation in : 19 ac ə w = ف Write down the second order ODE using the specific T and V defined above. Please write this ODE in the form = f(0,0). Notice that this ODE is not linear! Now you may assume that l = m = g = 1 for the remainder of the problem. 0 You may still suspend variables to get a system of two first order (nonlinear) ODEs by writing the ODE as: w = f(0, w) What are the fixed points of this system where all derivatives are zero? Write down the linearized equations in a neighborhood of each fixed point and determine the linear stability. You may formally linearize the nonlinear ODE or you may use a small angle approximation for sin(); the two approaches are equivalent.

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Consider the schematic of the single pendulum.
M
The kinetic energy T and potential energy V may be written as:
T = ²m²²8²
V = -gml cos (0)
аас
dt 80
The Lagrangian L is given by L=T-V, and the Euler-Lagrange equations for the motion
of the pendulum are given by the following second order differential equation in :
ас
80
=
11
= 0
Write down the second order ODE using the specific T and V defined above. Please write
this ODE in the form = f(0,0). Notice that this ODE is not linear!
Now you may assume that l = m = g = 1 for the remainder of the problem.
You may still suspend variables to get a system of two first order (nonlinear) ODEs by
writing the ODE as:
w = f(0,w)
What are the fixed points of this system where all derivatives are zero?
Write down the linearized equations in a neighborhood of each fixed point and determine
the linear stability. You may formally linearize the nonlinear ODE or you may use a small
angle approximation for sin(0); the two approaches are equivalent.
Transcribed Image Text:Consider the schematic of the single pendulum. M The kinetic energy T and potential energy V may be written as: T = ²m²²8² V = -gml cos (0) аас dt 80 The Lagrangian L is given by L=T-V, and the Euler-Lagrange equations for the motion of the pendulum are given by the following second order differential equation in : ас 80 = 11 = 0 Write down the second order ODE using the specific T and V defined above. Please write this ODE in the form = f(0,0). Notice that this ODE is not linear! Now you may assume that l = m = g = 1 for the remainder of the problem. You may still suspend variables to get a system of two first order (nonlinear) ODEs by writing the ODE as: w = f(0,w) What are the fixed points of this system where all derivatives are zero? Write down the linearized equations in a neighborhood of each fixed point and determine the linear stability. You may formally linearize the nonlinear ODE or you may use a small angle approximation for sin(0); the two approaches are equivalent.
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