An engineer is interested in the horizontal displacement of the dynamic system depicted in Fig. Q1. The two solids have the same mass m, are connected by a spring with stiffness k, and are both connected to the ground by dampers (viscous damping) with a damping coefficient c. The horizontal displacement of the left mass is denoted by 2₁ (t) and the horizontal displacement of the right mass is denoted by 12(t). Both masses are initially at rest (the initial displacement and speed are zero). A force fi(t) is applied on the left mass and a force f2(t) is applied on the right mass. Data:

Elements Of Electromagnetics
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I’m struggling with questions a b c
x₁ (t)
Data:
m = 2 kg.
k = 1 N/m.
c = 4 Ns/m.
fi(t)=-1 N.
fa(t)=2 N.
C
m
лий
b) Introducing the change of variable
x₂ (t)
Fig. Q1 Dynamic system
An engineer is interested in the horizontal displacement of the dynamic system depicted in Fig. Q1.
The two solids have the same mass m, are connected by a spring with stiffness k, and are both
connected to the ground by dampers (viscous damping) with a damping coefficient c. The horizontal
displacement of the left mass is denoted by 21 (t) and the horizontal displacement of the right mass
is denoted by 22(t). Both masses are initially at rest (the initial displacement and speed are zero). A
force fi(t) is applied on the left mass and a force f2(t) is applied on the right mass.
C
91 (t) = x₁(t) + ₂(t),
92 (t)=₁(t)-T2(t),
m
a) Show that the displacements ₁ (t) and r2(t) are given by the solutions of the equations
mä(t) + ci(t) +k(F₁(t)- T₂(t)) = f(t),
mi₂(t)+ci₂(t)+k(x2(t)-1(t)) = f(t).
and combining the two equations established in Q1-a, show that q₁ (t) and q2 (t) are given by the
solutions of the equations
mai (1) + ci(t)=√1 (1) + S2(1),
miz(t) + c(t) + 2kga(t) = f(t) - fa(t).
c) Calculate q, (f) and qz (1) (hint for q (t); introduce the change of variable z(t) = (t))
Transcribed Image Text:x₁ (t) Data: m = 2 kg. k = 1 N/m. c = 4 Ns/m. fi(t)=-1 N. fa(t)=2 N. C m лий b) Introducing the change of variable x₂ (t) Fig. Q1 Dynamic system An engineer is interested in the horizontal displacement of the dynamic system depicted in Fig. Q1. The two solids have the same mass m, are connected by a spring with stiffness k, and are both connected to the ground by dampers (viscous damping) with a damping coefficient c. The horizontal displacement of the left mass is denoted by 21 (t) and the horizontal displacement of the right mass is denoted by 22(t). Both masses are initially at rest (the initial displacement and speed are zero). A force fi(t) is applied on the left mass and a force f2(t) is applied on the right mass. C 91 (t) = x₁(t) + ₂(t), 92 (t)=₁(t)-T2(t), m a) Show that the displacements ₁ (t) and r2(t) are given by the solutions of the equations mä(t) + ci(t) +k(F₁(t)- T₂(t)) = f(t), mi₂(t)+ci₂(t)+k(x2(t)-1(t)) = f(t). and combining the two equations established in Q1-a, show that q₁ (t) and q2 (t) are given by the solutions of the equations mai (1) + ci(t)=√1 (1) + S2(1), miz(t) + c(t) + 2kga(t) = f(t) - fa(t). c) Calculate q, (f) and qz (1) (hint for q (t); introduce the change of variable z(t) = (t))
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