Research on a Hollow Cylinder Specimen Apparatus and Self-tuning and Predicting Control Technique of Stress Paths

This paper researched on a hollow cylinder specimen apparatus to realize the controlled three-dimension and torque loading,using mechano-electro-hydro-optical integration technique, to imitate the three dimensional or three dimensional accompanied by principal stress rotation operating mode of agricultural soils and actual engineering problems, the paper adopt Wittenmark self-tuning and predicting controlling method to overcome the nonuniformity on the response rate among the different kinds of loading device of the apparatus to make more sampling points follow the stress paths. All the test procedures are under the supervision of a microcomputer IBM PC/XT.