zoneA = new machines
zone B = unrestricted long term operation
zoneC = unsatisfactory for long term operation machine can be operated until remedial action
zone D = damage to the machine is possible
Class I = small machine or part of, below 15 kW
ClassII = medium sized machines ( 15-75 kW) without special foundation
ClassIII = large machines, rotating masses, mounted on rigid foundations, relatively stiff in the direction of vibration measurements
Class IV = large machines, rotating masses, mounted onfoundations whichare relatively soft inthe direction of vibration measurments 一般常用振动限值来自于标准(ISO10816-1,-2或者GBT 6075)或者与客户协商
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