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.