.Modelica.Mechanics.MultiBody.Interfaces.PartialRelativeSensor .Modelica.Mechanics.MultiBody.Interfaces.PartialRelativeSensorThis is a base class for 3-dim. mechanical components with two frames and one output port in order to measure relative quantities between the two frames or the cut-forces/torques in the frame and to provide the measured signals as output for further processing with the blocks of package Modelica.Blocks.