Vibration Measurement Units

Vibration measuring instruments vibration terminology important parameters relating to vibration pickups vibrometers are described below.

Vibration measurement units.

Acceleration can be expressed in the true values of m sec2 rms or gravitational units g where 1g is equal to 9 81 m sec2 approximately. The vibration parameters are almost universally measured in metric units in accordance with iso requirements these are shown in the table. F refers to the number of times a vibrating object vibrates per second. Vibration is the movement or mechanical oscillation about an equilibrium position of a machine or component.

Psi kg cm2 x 14 223. In north america the velocity unit usually used for linear velocity scales 8 is in s and a commonly used frequency unit is kcpm kilocycles per minute. Psi pascal pa x 1 45 x 10 4. Which units should be used is really a matter of personal choice or more often geographic location.

Kg cm2 psi x 0 0703. The gravitational constant g is still widely used for acceleration levels al though it is outside the iso system of coherent units. In lb mm n x 0 175. Units used are inches per second or millimeters per second for velocity or in terms of g or meters per second per second for acceleration.

Vibration can be expressed in metric units m s2 or units of gravitational constant g where 1 g 9 81 m s2. The inverse of a vibration frequency is referred to as the period t t 1 f. The vibration spectrum provides important frequency information that can pinpoint the faulty component. It can be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road.

Pascal kg cm2 x 9 8 x 104. When we consider cycles per second or the number of times a repetitive motion is generated by a vibrating. The diagram on the previous page showed a typical value for vibration of 1 2 g rms. Vibration velocity and acceleration are measured as zero to peak or rms.

1 vibration frequency unit. When the vibrating object. Convert between commonly used vibration units such as. Mm n in lb x 5 7.

If we talk about the amplitude distance between the peaks of vibration or the distance a vibrating.