Vibration Measurement Units

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 measurement units.

Mm n in lb x 5 7. Convert between commonly used vibration units such as. Psi kg cm2 x 14 223. Psi pascal pa x 1 45 x 10 4.

The inverse of a vibration frequency is referred to as the period t t 1 f. 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. It can be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road.

Vibration velocity and acceleration are measured as zero to peak or rms. 1 vibration frequency unit. If we talk about the amplitude distance between the peaks of vibration or the distance a vibrating. Kg cm2 psi x 0 0703.

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 diagram on the previous page showed a typical value for vibration of 1 2 g rms. Pascal kg cm2 x 9 8 x 104.

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. 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. The vibration parameters are almost universally measured in metric units in accordance with iso requirements these are shown in the table. Acceleration g s rms acceleration in sec2 rms acceleration mm sec2 rms velocity mm s rms velocity mm s peak velocity in s rms velocity in s peak displacement mils peak peak displacement mm peak peak displacement µm peak peak.

Pascal psi x 6895. In lb mm n x 0 175. When we consider cycles per second or the number of times a repetitive motion is generated by a vibrating. F refers to the number of times a vibrating object vibrates per second.

The vibration spectrum provides important frequency information that can pinpoint the faulty component.