## Turbocharging and supercharging

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(i) Coefficient of fluctuation of speed: Coefficient of fluctuation of speed is defined as the ratio of the maximum fluctuation of speed to the mean speed. It is denoted by C s.

Mathematically,

C s = (N 1 – N 2 ) /N

Where, N 1 = maximum speed in rpm;

N 2 =minimum speed in rpm; N = mean speed in rpm

Classification of drives:

(i) Belt drives.

(ii) Chain drives.

(iii) Rope.

(iv) Gear drives.

(i) Pressure angle: It is the angle between the direction of the follower motion and a normal to the pitch curve. This angle is very important in designing a cam profile. If the pressure angel is too large, a reciprocating follower will jam in its bearing.

(ii) Pitch point: It is point on pitch curve having the maximum pressure angle.

Types of constrained motion:

(i)Completely constrained motion.

(ii)Incompletely constrained motion.

(iii)Successfully constrained motion.