Analogous System

Comparing eqn. (2.1) for the mechanical translational system shown in Fig. 25 ) or en
(2.13) for the mechanical rotational system shown in Fig. 2.10 (a) and equation. (2.24) for the electrical
system shown in Fig. 2.11, it is seen that they are of identical form. Such systems whose
differential equations are of identical form are called analogous systems. The force F (torqu
and voltage e are the analogous variables here. This is called the Force (Torque)-Voltage anal
A list of analogous variables in this analogy is given in Table 2.2.

2

Similarly equations. (2.1) and (2.3) referred above and equation. (2.26) for the electrical system
shown in Fig. 2.13 are also identical. In this case force F (torque T) and current i are the
analogous variables. This is called the Force (Torque)-Current analogy. A list of analogous
quantities in this analogy is given in Table 2.3.
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