This standard specifies methods for determining the sensitivity of machine vibration to unbalance and provides guidance for evaluating sensitivity as a function of the proximity of critical speeds to operating speeds. This standard also includes the grouping of certain machines according to their susceptibility to unbalanced changes. It also provides recommendations on what sensitivity values to apply for some specific machines. 1.2 Classify machines into the three types shown in 4. and show the sensitivity values for each group in 5. This sensitivity value should be applied to simple systems of machines, preferably those with only one critical speed within the entire operating speed range. It may also be applicable to machines with many critical speeds within the operating speed range, provided that the critical speeds are sufficiently far apart from each other (e.g., 20% or more). It is not intended to provide acceptance criteria for a group of machines, but rather to provide guidance to avoid serious inaccuracies or excessive or unfeasible requirements, e.g. more accurate measurements of sensitivity. In special cases where this is necessary, these values are useful for detailed consideration.If appropriate measures are taken using the recommended values as a reference, satisfactory operating conditions can be expected in most cases. Mere consideration of the sensitivity value does not necessarily guarantee that the specified vibration value during operation will not be exceeded.It must be recognized that there are many causes of vibration other than those covered by this standard.
JIS B 0911:2000 history
2000JIS B 0911:2000 Mechanical vibration -- Susceptibility and sensitivity of machines to unbalance