Vibration Measuring Instruments:

The vibration response might be expressed in terms of several parameters that mean displacement, velocity, and acceleration and induced stress. The selection of the parameter based on the objective and the field of application. For a vehicle designer the comfort of the passenger is significant, hence, normally vibration in a vehicle is expressed in terms of acceleration. In order to measure vibration a transducer is utilized that generates voltage proportional to the magnitude of parameter.

Vibration equipment might be thought of a spring mass system enclosed in a box kind of a thing. It is illustrated in Figure 3. The box is fitted on the vibrating base. The dynamical differential equation is showed by

m ? + k ( x - y) = 0

Let          z = x - y

---------------------(7)

The solution of this differential equation is specified by

z = Z sin (ωt - φ)

where

                  . . . (.8)

If damping is also considered

                ------------------ (9)