ISO 20412018 pdf free.Mechanical vibration, shock and condition monitoring – Vocabulary.
This document defines terms and expressions unique to the areas of mechanical vibration, shock and condition monitoring.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
ISO and IEC maintain terminological databases for use in standardization at the tollowing addresses:
— ISO Online browsing platform: available at https://wwwiso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 General terms
3.1.1 displacement relative displacement
(vibration and shock) time varying quantity that specifies the change in position of a point on a body with respect to a reference frame
Note ito entry: The reference frame is usually a set of axes within which a set of coordinates defines the change in position of a point on a body. In general, a rotation displacement vector, a translation displacement vector, or both can represent the displacement.
Note 2 to entry: A displacement is designated as a relative displacement if it is measured with respect to a reference frame other than the primary reference frame designated in a given case.
Note 3 to entry: Displacement can be:
— oscillatory, in which case simple harmonic components can he defined by the displacement amplitude (and frequency), or
— random, in which case the rootmeansquare (rms) displacement (and bandwidth and probability density distribution) can be used to define the probability that the displacement will have values within any given range.
Note 4 to entry: Displacements of short time are defined as transient displacements. Nonoscillatory displacements are defined as sustained displacements, if of long duration, or as displacement pulses, If of short duration.
3.1.2 velocity relative velocity (vibration and shock) rate of change of displacement.
3.1.3 acceleration relative acceleration (vibration and shock) rate of change of velocity
Note 1 to entry: In general, acceleration is timedependent.
Note 2 to entry: The reference frame is usually a set of axes within which a set of coordinates defines the rate of change of velocity of a point on a body. In general, a rotation acceleration vector, a translation acceleration vector,or both and the Coriolis acceleration can represent the acceleration.
Note 3 to entry: An acceleration is designated as a relative acceleration if it is measured with respect to a reference frame other than the inertial reference frame designated in a given case. The relative accelerationbetween two points is the vector difference between the accelerations of the two points.
Note 4 to entry: In the case of timedependent accelerations, various selfexplanatory modifiers, such as peak,average and rms (rootmeansquare), are often used. The time intervals over which the average or rootmean square values are taken should be indicated or implied.
Note 5 to entry: Acceleration can be:oscillatory, in which case simple harmonic components can be defined by the acceleration amplitude (and
frequency), or random, in which case the rms acceleration (and bandwidth and probability density distribution) can be used to define the probability that the acceleration will have values within any given range.ISO 2041ISO 2041 pdf free download.
ISO 20412018 pdf free
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