Vibration Measurement Units

The diagram on the previous page showed a typical value for vibration of 1 2 g rms.

Vibration measurement units.

Vibration measuring instruments vibration terminology important parameters relating to vibration pickups vibrometers are described below. Mm n in lb x 5 7. Pascal psi x 6895. The vibration spectrum provides important frequency information that can pinpoint the faulty component.

When the vibrating object. The inverse of a vibration frequency is referred to as the period t t 1 f. 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. 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.

Psi kg cm2 x 14 223. If we talk about the amplitude distance between the peaks of vibration or the distance a vibrating. Which units should be used is really a matter of personal choice or more often geographic location. Vibration velocity and acceleration are measured as zero to peak or rms.

When we consider cycles per second or the number of times a repetitive motion is generated by a vibrating. The gravitational constant g is still widely used for acceleration levels al though it is outside the iso system of coherent units. 1 vibration frequency unit. Vibration is the movement or mechanical oscillation about an equilibrium position of a machine or 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. Kg cm2 psi x 0 0703. Vibration can be expressed in metric units m s2 or units of gravitational constant g where 1 g 9 81 m s2. 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.

Convert between commonly used vibration units such as. 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. In lb mm n x 0 175. 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.

Psi pascal pa x 1 45 x 10 4.