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.
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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