Write a program in Maple ( or Mupad) to use the techniques of Laplace
transforms to solve the system of equations
= ax + by
= cx + dy
for any specified values of a, b, c, d, x(0), y(0), Dx(0), Dy(0). Use examples to
test this program and in particular use it in the case
a = b = c = d = 1, x(0) = 1, Dx(0) = 0, y(0) = 0, Dy(0) = 1
To complete the assignment apply your program to solve ONE of the
two physical systems given below. You should choose appropriate and realistic parameters and illustrate your solutions with both an analytical and
1. The equations for two identical masses coupled by three springs are
m 2 = -kx – k(x – y)
= -k(y – x) – ky
where x and y are the displacements of the masses from their equilibrium position.Initially the masses are displaced from their equilibrium
positions and then released so that
x(0) = a, y(0) = b, Dx(0) = Dy(0) = 0
Repeat the calculations with different , small displacements, a, b , different realistic force constants and comment on the output.
2. The equations for a circuit comprising of two identical LC circuits coupled with a different capacitor ,Cˆ are
= -?(1 + a)I1 – ? 2 aI2
= -?(1 + a)I2 – ? 2 aI1
where I1 , I2 are the currents in the two circuits and
For given, realistic values of L, C, Cˆ solve this system for different initial
currents I1 (0), I2 (0) and derivatives I10 (0), I20 (0).
The figures below illustrate the physical systems.
md 2 x/dx^2 = -kx – k(x-y), md 2 y/dy^2 = -k(y-x) -ky . Here x and y are the displacements measured
from the masses m and k is the common spring constant.
d^2x/dt^2= -w^2(1+a)x -w^2a y, d^2y/dt^2 = -w^2(1+a)y – w^ax, a= C2/C1, C1=C3, w^2 = 1/(LC1)
Here x an y are the current in the left circuit and right circuit respectively. The C’s are the capacitances and
L an inductance.
Figure 1: Spring and Circuit
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