Vibration Measurement Units

Psi kg cm2 x 14 223.

Vibration measurement units.

Mm n in lb x 5 7. In lb mm n x 0 175. Pascal kg cm2 x 9 8 x 104. Psi pascal pa x 1 45 x 10 4.

F refers to the number of times a vibrating object vibrates per second. Convert between commonly used vibration units such as. Kg cm2 psi x 0 0703. Va can use the units of displacement velocity and acceleration displayed as a time waveform twf but most commonly the spectrum is used derived from a fast fourier transform of the twf.

It can be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road. 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. Vibration can be expressed in metric units m s2 or units of gravitational constant g where 1 g 9 81 m s2. The vibration parameters are almost universally measured in metric units in accordance with iso requirements these are shown in the table.

The vibration spectrum provides important frequency information that can pinpoint the faulty component. 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. Vibration measuring instruments vibration terminology important parameters relating to vibration pickups vibrometers are described below. Which units should be used is really a matter of personal choice or more often geographic location.

Pascal psi x 6895. When we consider cycles per second or the number of times a repetitive motion is generated by a vibrating. If we talk about the amplitude distance between the peaks of vibration or the distance a vibrating. Vibration is the movement or mechanical oscillation about an equilibrium position of a machine or component.

The gravitational constant g is still widely used for acceleration levels al though it is outside the iso system of coherent units. The inverse of a vibration frequency is referred to as the period t t 1 f. Vibration velocity and acceleration are measured as zero to peak or rms. The diagram on the previous page showed a typical value for vibration of 1 2 g rms.

1 vibration frequency unit.