2results about How to "Improve displacement control accuracy" patented technology

The invention discloses a dynamic regulation and control system and method for friction force of a servo cylinder. The dynamic regulation and control system is characterized in that a dynamic sealing pair of the servo cylinder is provided with a magneto-rheological elastomer dynamic seal; a magnetizing device is arranged on one side of the magneto-rheological elastomer dynamic seal, an axial positioning sensor is arranged on the servo cylinder, the magnetizing device is connected with a magnetic control unit, and the axial positioning sensor is connected with the magnetic control unit; the magnetic control unit judges whether the dynamic sealing pair area of the servo cylinder is in the starting stage or not through the axial positioning sensor and controls the magnetizing device to regulate and control the magnetic field intensity according to the judgment result. The problems of creeping and shaking of the servo hydraulic cylinder caused by the viscous effect of elastomer sealing in the starting process can be solved, and the displacement control precision of the servo cylinder is improved.

The application belongs to the technical field of tunnel engineering detection, and discloses a tunnel displacement simulation device and a detection calibration method, which comprises multiple groups of tunnel simulation units, the multiple groups of tunnel simulation units are sequentially spliced, each group of tunnel simulation units comprises two groups of arches, a support steel frame and a plurality of groups of telescopic pipe piece assemblies; the two groups of arches are oppositely arranged, the support steel frame is in a semicircular arc support structure and is arranged between the two groups of arches; the plurality of groups of telescopic pipe piece assemblies are arranged on the support steel frame and are sequentially arranged along the arc surfaces of the two groups of arches, wherein the adjacent telescopic pipe piece assemblies are connected, and the plurality of groups of telescopic pipe piece assemblies can simultaneously expand and contract along the radial direction of the two groups of arches and are used for simulating the profile range between the maximum profile and the minimum profile of the tunnel. The application can realize the simulation of the dynamic continuous deformation of the tunnel, does not need manual comparison of the scale, reduces the error caused by manual operation and lays a structural foundation for high-precision calibration.