Research on temperature drift current fluctuation of nozzle flapper servo valve
LI Lei
LI Changchun
YAN Hao
QIN Jiayan
WANG Peng
Abstract：In order to find out why temperature drift can cause current fluctuation in servo valve,the changing rules of how temperature produces a wedge effect on the spool is elaborated by sim-ulation,in which the effect of thermal expansion on main spool is taken into consideration.The local temperature distribution in spool axial dimension is simplified to a one-dimensional steady-state heat conduction.Thus an expression which show the changing rules of the wedge-shaped clearance between the spool and spool sleeve is derived.Accordingly,a coulomb friction expres-sion under slide valve wedge deformation is deduced based on clearance flow rules of slide valve,by which the current variable quantity of servo valve under coulomb friction is obtained.Finally,by comparing theoretical analysis and tests,it is proved that the current fluctuation in servo valve caused by temperature drift is relevant to the non-linear friction caused by temperature rise inside servo valve.
Keywords：servo valvenonlinear frictionclearance flowtemperature drift
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 96-102 )