| http://www.w3.org/ns/prov#value | - The estimated traveling head friction component 760 and the estimated traveling head damping gain 762 are provided to take into account friction and damping effects that may be present in the mechanical structure associated with the hydraulic actuators 110-a, b, for example mechanical rails or guides which substantially constrain the hydraulic actuators 110-a, b to motion in a single Z-axis.
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