39results about How to "Reduce displacement error" patented technology

The invention discloses a high-precision integrated navigation positioning method for an underwater glider. The method comprises the steps that output of an inertial measurement unit (IMU) is subjected to rough processing and fine processing; higher-precision data is obtained; data obtained by dead reckoning based on a Runge-Kutta method (RK4) is combined; adaptive Kalman filtering (AKF) and unscented Kalman filtering (UKF) are conducted; the filtered data is fed back to the IMU; an accumulative error of the IMU is corrected; and relatively accurate information such as position, speed and gesture is finally output. The autonomous navigation method for the underwater glider has the advantages of high precision, real-time performance, stability, and the like, so that a whole navigation system can stably operate at long endurance, high precision and low power consumption, the current position and gesture information of an underwater aircraft can be obtained rapidly and accurately, and navigation path and position parameters can be provided for the underwater aircraft.

The invention provides a combined hardness measuring instrument. The combined hardness measuring instrument is composed of a measuring main body and a group of different frameworks; the measuring main body has a cavity and a positioning groove, and a user selects different frameworks according to measuring needs and installs the selected frameworks on the positioning groove of the measuring main body; a probe is installed in the cavity of the measuring main body, a force cell sensor equipped with a through hole in its end surface is mounted in the probe, one end of a drive pin contacts with a displacement measuring sleeve, and the other end of the drive pin penetrates the through hole and contacts with a driving plate; a motor connected with a speed reducer is installed at the other end of the measuring main body, and the speed reducer reduces the speed of the motor and is installed on a screw of a bearing pedestal in a driving manner so as to drive the probe to move. With such a structure, the user can select a corresponding framework according to a to-be-detected workpiece and assembles the framework and the measuring main body into a specific hardness measuring instrument which can measure hardness of a to-be-detected workpiece with a complex shape; thus, the application scope of the combined hardness measuring instrument is widened, and testing requirements of the user are substantially met.

The invention discloses a one-face two-pin precise positioning system. The one-face two-pin precise positioning system is characterized by comprising a worktable, a round pin positioning device, a diamond pin positioning device and a control system; the control system comprises a first power device and a second power device, the first power drive drives a first plunger to move in a plunger hole of a round pin, the round pin is driven to move upwards by upwards extruding hydraulic plastics, the positioning portion of the round pin is inserted into a corresponding positioning hole of a workpiece, the positioning portion of the round pin generates corresponding plastic deformation and expands, and the gap between the round pin and the corresponding positioning hole in the workpiece is reduced. The second power device drives a second plunger to move in a plunger hole of a diamond pin, the diamond pin is driven to move upwards by upwards extruding the hydraulic plastics, the positioning portion of the diamond pin is inserted into a corresponding positioning hole of the workpiece, the positioning portion of the diamond pin generates corresponding plastic deformation and expands, and the gap between the diamond pin and the corresponding positioning hole in the workpiece is reduced.

The invention discloses a bi-directional supporting system deformation monitoring and compensating device and a construction method, and belongs to the technical field of foundation pit supporting systems. The bi-directional supporting system deformation monitoring and compensating device and the construction method solve the problems that during a construction process of a traditional bi-directional steel support, one end is used as a fixing end, and the other end is installed, so that the accurate positioning of a cross joint of super long bi-directional steel support is hard to guarantee; and the construction safety of a deep and large foundation pit is hard to guarantee since a displacement error is easy to produce by applying a prestress. The system comprises a cross joint, and steelsupports and adjustable ends symmetrically and sequentially arranged on two sides of the cross joint, wherein the other ends of the adjustable ends are connected with an enclosing purlin of the foundation pit through embedded parts; and a synchronous control device capable of detecting and controlling displacement deviations of the steel supports and the cross joint is arranged on the cross joint.The construction method comprises the steps of firstly excavating an earthwork of the foundation pit from the middle part to two sides, and sequentially forming diagonal braces and inclined struts, wherein during diagonal brace construction, the cross joint is firstly positioned and installed, then the steel supports are arranged at two ends, the cross joint and the adjustable ends at two ends are remained, and finally prestresses are synchronously applied to the adjustable ends.

A device for thermal keratoplasty, the device comprising a plurality of ultrasonic transducers for emitting ultrasound waves, wherein the ultrasound waves of at least one of the transducers is focused on a corresponding area of the cornea in order to heat these area and cause collagen shrinkage and at least one of the transducers is capable of receiving ultrasound waves for ocular imaging.

The invention discloses a deformable mirror device capable of generating a plurality of aberrations, and belongs to the field of aberration compensation of an optical system. The problems that loading of axial force, tangential moment, and radial moment at the same time only through loading force on an extension piece cannot realized in the prior art, and precision of effective aberration and an error of rigid body displacement are hard to control. According to the device, a mirror frame between an optical component and a deformable mirror frame is formed through adhesion or tight pressing. A plurality of actuators are fixed on an external ring of the deformable mirror frame, respectively, and input force is applied to actuating arms of the deformable mirror frame. The deformable mirror frame is of an integrated structure formed by connecting the external ring of the mirror frame and an interior ring of the mirror frame through a plurality of circumferentially-distributed flexible blocks, and one actuating arm is distributed between every two flexible blocks. The actuating arms are connected to the interior ring of the mirror frame, and are separated from the external ring of the mirror frame by a slit from linear cutting. A cross section of each actuating arm is a cross-shaped beam, and the eight actuators are acted on upper and lower sides of four ends of the cross-shaped beam, respectively.

The invention discloses dynamic calibration equipment for a six-dimensional force sensor and a loading method of the dynamic calibration equipment, and belongs to the technical field of sensor testing. The dynamic calibration equipment comprises a lower bed body, a to-be-tested sensor, a connecting plate, a displacement sensor, an electric cylinder, a speed reducer, columns, a bearing plate, a servo motor, a connector, an upper bed body, a standard sensor, a servo motor, a working plate, a connector, a standard sensor, an electric cylinder, a fixing plate, a vertical plate, a loading column, achuck and a PLC control box. According to the dynamic calibration equipment, based on the basic principle of a negative step load, through the rotation of the servo motor, a load is slowly applied tothe to-be-tested sensor, the force value is stabilized by relying the self-locking performance of the electromagnetic brake of the servo motor, the servo motor is controlled by a PLC to rotate reversely, and instantaneous unloading can be conducted to form the negative step load. The dynamic calibration equipment can calibrate the FX, FY, FZ, MZ, MX and MY of the six-dimensional force sensor witha large force value, is small in occupied space, precise and reliable, and can simultaneously meet the requirements of dynamic calibration, static calibration and quasi-static calibration.

The invention provides a production method of an LTPS array substrate. According to the method, one photomask is used for respectively patterning a light shielding metal layer and photoresist for performing N type heavy doping, thus forming a plurality of parallel spaced light shielding metal strips, and a plurality of photoresist strips overlapped one by one with the light shielding metal strips. By the production method, the number of photomasks required by production of the LTPS array substrate is reduced, the production cost is lowered, the displacement errors among membranous layers are reduced, the manufacture procedure precision is elevated, and the product quality is guaranteed.

The invention relates to the technical field of paper cutting, in particular to a high-speed spiral ceramic paper cutter. The high-speed spiral ceramic paper cutter comprises a cutter holder, a fixed tool post and a movable tool post, and an arc-shaped groove coaxial with the fixed tool post is arranged on the cutter holder; the end part of the movable tool post is rotatably and slidably mounted in the arc-shaped groove, and is in transmission connection with the fixed tool post through a belt; the movable tool post is provided with an initial position and a reversing position in the arc-shaped groove, the movable tool post is located below the front side of the axis of the fixed tool post and rotates in the first direction when the movable tool post is located at the initial position, and the movable tool post is located above the front side of the axis of the fixed tool post and rotates in the second direction opposite to the first direction when the movable tool post is located at the reversing position; the fixed tool post and the movable tool post are each provided with a cutting edge spirally extending around the axis of the fixed tool post and the axis of the movable tool post, so that when the fixed tool post and the movable tool post rotate in the first direction, the fixed tool post and the movable tool post are always tangent on the same horizontal line, paper can be cut open in the third direction, and when the fixed tool post and the movable tool post rotate in the second direction, the paper is cut open in the fourth direction opposite to the third direction.

The invention relates to a magnetostriction actuator displacement magnification mechanism. The mechanism comprises a magnetostriction actuator, a displacement magnification mechanism, splints and support seats, the magnetostriction actuator is fixed on the bottom, four support seats are fixed above the top cover of the magnetostriction actuator; the displacement magnification mechanism is installed on the top end of the output shaft of magnetostriction actuator; two splints are fixedly installed through screw bolts on the two sides of the displacement magnification mechanism; the support seats are fixed on the two sides of the splints through the screw bolts symmetrically in pairs; the displacement magnification mechanism and the splints are fixed by the screw bolts through four support seats with the upper cover of the magnetostriction actuator. The differential leverage principal is utilized by the magnetostriction actuator displacement magnification mechanism, the magnification of the outputted infinitesimal displacement through the flexure hinge elastic deformation in the magnetostriction actuator work process is achieved, the job requirements are met, and the desired magnification effect is achieved.

The invention relates to a counting type variable-pitch grating displacement sensor. The sensor comprises a collimation optical system and a Y-shaped optical fiber, wherein the collimation optical system is arranged in the sensor, the Y-shaped optical fiber penetrates into the sensor and is opposite to one side of the collimation optical system, a guide rail is arranged in a sensor shell, and a sliding block is arranged on the guide rail in a sliding mode through a connecting shaft; a reflecting mirror opposite to the other side of the collimating optical system is arranged on the inner side of the sliding part, and a variable-pitch grating opposite to the reflecting mirror is arranged at the bottom end in the sensor. The counting type variable-pitch grating displacement sensor is advantaged in that the counting type variable-pitch grating displacement sensor is provided, overall precision of the sensor is improved, the requirement for the guide rail machining precision is lowered, and applicability of the device is improved.

The invention provides a 3D printer including a printing chamber, a push rod and machining parts. The printing chamber is provided with a number of printing work stations in surrounding arrangement; the push rod has a moving track extending along a ring enclosed by the printing work stations; the machining parts each include a stand column and a machine head, and the stand columns are erected in the ring enclosed by the number of printing work stations; the machine heads take the stand columns as base parts, are scattered outwards radially and are located above the corresponding printing workstations. The 3D printer has the advantages that the number of printing work stations are in surrounding arrangement, a cylinder and the push rod can be shared, and the vertical direction and horizontal direction displacement of the number of machining parts can be controlled at the same time, so that a unified action is achieved, the displacement error is small, and small batch 3D printing is convenient.

The invention relates to a spiral multifunctional test device for physical properties of materials. The device comprises a container, a disc piston matched with an outlet of the container, a driving device, a measuring device and a sensor, wherein the container is cylindrical and is provided with three closed sides and an internal thread, and a heating device is arranged on the outer surface of the container; an exhaust system is arranged on the piston, an external thread matched with the internal thread is arranged on the outer side surface of the piston, and the piston can move vertically inthe container by rotation of the piston; the measuring device comprises a measuring ruler and a slider. The high-precision threads are formed on the inner wall of the container and the outer side surface of the piston, the piston can rotate and move vertically in the cylindrical container under thread rotation, so that seal can be guaranteed by thread connection, displacement errors can be reduced, and pressure stability and volume stability can be guaranteed; meanwhile, the position of the piston is detected in real time by a range unit, and volume precision can be guaranteed.