Theory of Machine
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Damping factor
Damping coefficient
Magnification factor
Logarithmic decrement

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Theory of Machine
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r (cos 2θ/n)
m.ω².r (sin 2θ/n)
m.ω².r sinθ
m.ω².r cosθ

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