new unit:REV-PER-MIN-SEC

[VladimirAlexiev]

Encountered it in wind farm data as "Drive train acceleration(crpm)".
Calculated multiplier based on unit:REV-PER-SEC2 qudt:conversionMultiplier 6.28318531

unit:REV-PER-MIN-SEC
  a qudt:Unit ;
  dcterms:description "Revolution per Minute per Second is a unit for Angular Acceleration (sometimes called Change of RPM, crpm)"^^qudt:LatexString ;
  qudt:conversionMultiplier 376.9911186 ;
  qudt:conversionMultiplierSN 3.769911186E2 ;
  qudt:hasDimensionVector qkdv:A0E0L0I0M0H0T-2D0 ;
  qudt:hasQuantityKind quantitykind:AngularAcceleration ;
  qudt:symbol "rev/min/s" ;
  qudt:ucumCode "{#}.min-1.s-1"^^qudt:UCUMcs ;
  rdfs:isDefinedBy <http://qudt.org/2.1/vocab/unit> ;
  rdfs:label "Revolution per Minute per Second"@en ;
.

[fkleedorfer]

Looks good to me, would you be willing to make a PR from a fork?