Generic Vibration Criteria 

Introduction

The vibration criterion (VC) curves, widely used and

accepted throughout the world as a basis for evaluating 

facilities for vibration-sensitive instruments and tools

and designing structures that will support vibration-sensitive

equipment and process, were developed by Colin Gordon

and his associates. Equipment operational problems that

caused by vibration, can be prevented if environmental

vibration complies with the vibration criterion curves

appropriate to the equipment specific vibration criteria. 

Vibration Criterion Curves (VC Curves)

The vibration criterion criteria takes the form of a set of

one-third octave band velocity spectra labeled vibration

criterion curves VC-A through VC-G, illustrated in Figure 1

and numerically defined in Table 1. The vibration is expressed

in terms of its root-mean-square (rms) velocity. 

Figure 1

What are Octave Bands?

Octave Bands provide a method of splitting

the vibration levels into smaller segments

known as Octaves, identifying different

vibration levels across individual frequencies.

One third Octave Bands are mainly used environmental

and noise control applications. Each Octave Band is
further split into three called one third Octave Band,
providing a more detailed view of vibration levels. The
entire frequency range is divided into sets of frequencies
known as bands. Each band represents a specific range
of frequencies. As the band increases, the upper band
frequency is twice the lower band frequency.

Table 1

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