590 results about "Motion accuracy" patented technology

Methods for motion estimation with adaptive motion accuracy of the present invention include several techniques for computing motion vectors of high pixel accuracy with a minor increase in computation. One technique uses fast-search strategies in sub-pixel space that smartly searches for the best motion vectors. An alternate technique estimates high-accurate motion vectors using different interpolation filters at different stages in order to reduce computational complexity. Yet another technique uses rate-distortion criteria that adapts according to the different motion accuracies to determine both the best motion vectors and the best motion accuracies. Still another technique uses a VLC table that is interpreted differently at different coding units, according to the associated motion vector accuracy.

The multiple-inlet shuffling machine has a shuffler and at least two card inputs. The shuffler has a base, a shuffling wheel mounted rotatably on the base and has multiple card slots formed radially around which, and a controller having at least one random number generator (RNG) that generates at least one random number. The card inputs are mounted oppositely on the base of the shuffler adjacent to the shuffling wheel and are controlled by the at least one random number generator (RNG) of the controller to randomly place cards into a same wheel further raising a randomness of the cards. relative to a number of compartments to number of cards ratio. Furthermore, operations are made via gears, so the multiple-inlet shuffling machine has improved precision of movement.

The invention discloses a direct driving type precise rotating table which comprises a working table (30) and a torque motor, wherein the torque motor comprises a motor shell (8), a main shaft (2), a stator (6) and a rotor (7), the motor shell (8) is fixedly connected with the stator (6) to form a static part, the main shaft (2) is fixedly connected with the rotor (7) to form a rotating part, and the working table (30) is directly and fixedly connected with the main shaft (2) of the torque motor. Furthermore, a circular arc crossing roller bearing (1) is arranged between the motor shell (8) and the main shaft (2) and comprises an inner ring (21), two outer rings (22) and a plurality of circular arc rollers (23) arranged among of the inner ring (21) and the outer rings (22), and the circular arc rollers (23) are sequentially crossed in an angle of 90 DEG. The invention has high radial and axial load capacity, good rigidity and high motion precision and stability, and can meet the integrated requirements of serving as a high-precision digital control rotating table.

The invention discloses a hydraulic vibration active isolation platform which comprises an upper platform, a lower platform, a two-degree-of-freedom hook joint, a three-degree-of-freedom hook joint and a hydraulic active actuating rod. According to the invention, since the two-degree-of-freedom hook joint and the three-degree-of-freedom hook joint are designed by adopting a pre-tightening anti-backlash technology, the hinge gap is eliminated and the motion accuracy of the hydraulic vibration active isolation platform is much higher. Based on the isolation platform, an active isolation platform with six-degree-of-freedom large-range vibration isolation capability is provided for the application field of vehicle mounted or onboard optical observation and laser aiming and other technologies, so that the disadvantage that the low-frequency large amplitude vibration is hardly isolated by the traditional isolation platform is overcome.

The invention discloses a parallel mechanism capable of realizing four-degree-of-freedom movement. The mechanism is characterized in that a subangle mechanism or the combination of the subangle mechanism and a parallelogram structure is adopted for a moving platform, thus the moving platform is of a rhombus structure, the relative positions of virtual central points of the structure are not changed, and only the deformation movement of relative extension and compression along the diagonal direction can be performed. The mechanism provided by the invention has the advantages of flexible movement, uniform stress, high movement accuracy; the relative movement is converted into rotation movement of an actuator through an angular magnification mechanism, moving pairs are not used in the mechanism, the defects such as nonuniform stress, great friction, short service life and the like are avoided, the integral structure has good rigidity and stability, high-speed movement can be realized easily, and requirements of complex grabbing operations are satisfied; and the mechanism has high reorganization, multiple configurations can be realized, and the clamping and rotation operations can be implemented, thus multiple choices are provided for practical applications.

The invention relates to a tool magazine and automatic tool changer comprehensive performance detecting system, which adopts a three-shaft acceleration sensor, a wireless vibration sensor, an industrial camera, a PSD (position sensory device) camera and a sound pressure sensor as detecting elements for detecting the comprehensive performance of a large-sized tool magazine and an automatic tool changer thereof. An IEPE (integrated electronics piezo electric) analog quantity collection card, a wireless gateway, an image collection card and an analog voltage collection card are adopted as a data collection or a signal transmission device to detect performances of the large-sized tool magazine and the automatic tool changer on the five aspects such as vibration of the tool magazine, vibration of a mechanical arm, positioning error of the tool magazine, the tool changing movement precision of a mechanical hand and the working noise of the entire machine and to transmit collected signals to an industrial personal computer. LabVIEW is adopted as a tool to design processing software special for analyzing and calculating data and for analyzing, operating and storing the acquired experimental data. The tool magazine and automatic tool changer comprehensive performance detecting system has the advantages of strong portability, wide measurement range, high measurement precision, low requirement on the professional technical level of an operator and the like and has strong practical application value.

The invention concerns a device for examining the precision of motion of a working spindle of an NC-controlled machine tool along a circular path for producing circular cylindrical surfaces on workpieces, comprising a first device part which can be coaxially mounted to the working spindle, a second device part which can be positioned on a machine table, which receives a workpiece to be processed, coaxially to the axis of a circular cylindrical surface to be produced on the workpiece, an electronic measuring value sensor which extends radially with respect to the axes of working spindle and circular cylindrical surface and is hinged to both device parts, and a shaft encoder which is rotatably disposed in the second device part coaxial relative to the axis of the circular cylindrical surface to be produced to determine the angular position of the measuring value sensor, wherein the measuring value sensor is held on one of the two device parts such that it can be adjusted and fixed transversely to the axes of the working spindle and the circular cylindrical surface.

The invention discloses a three-arm type non-cooperative target docking mechanism, relating to a satellite docking mechanism. The invention aims at solving the problems that the docking success rate of the existing satellite docking mechanism is comparatively low and the requirement on motion precision is extremely high. The three large mechanical arms of the invention are arranged on the periphery of a supporting platform at a 120 degree angle, one end of the large arm of the mechanical arm is articulated with the supporting platform, the other end thereof is articulated with one end of the small arm of the mechanical arm, and the other end of the small arm of the mechanical arm is connected with an end effector; the lower end of each bumper post is fixedly connected with the upper end of the supporting platform, the free end of each dashpot plunger is fixedly connected with the lower end of a target docking platform. In the invention, when the docking mechanism reaches a preset position, the three mechanical arms and the target docking platform form a closed region to encase a jet pipe, therefore, the jet pipe is placed in an inescapable space, and a target aircraft is clamped and fixed by the underdraught of the three mechanical arms and the upthrust of the target docking platform.

The invention relates to a six-freedom-degree industrial robot with ball screw pair transmission. Waist whole circle rotating is achieved through a waist swing mechanism, a shoulder swing mechanism and an elbow swing mechanism form a two-freedom-degree parallel mechanism to achieve two-dimensional horizontal moving, and ball screws are driven by motors arranged on a swing platform respectively. Three mutual-orthometric rotating shafts connected through a front arm rotating mechanism, a wrist swing mechanism and a tool clamping base swing mechanism are driven independently by three motors respectively, and three-freedom-degree gesture adjusting of an executing tail end tool is achieved. The advantage of the large working space of a serial mechanism is kept, ball screw transmission is used, the rigidness of the mechanism is guaranteed, the positions of the driving motors are lowered, good dynamic characteristics are obtained, bearing capacity is large, high-speed or superspeed operation can be easily achieved, and the six-freedom-degree industrial robot has the advantages that side gaps do not exist, rigidness is high, micro-motion feeding can be conveniently achieved, accumulated errors are small, motion accuracy is high, positive and athwart kinematics solving is convenient, and control is convenient.

A step-and-scan optical engraver wafer station mask station control system, its characteristics are: it comprises the main control module [13], the wafer station control module [12], the masking station control module [10] and the synchronization control module [11]. The invention uses the synchronous control with disturbance controller to reduce the effect of the movement precision and stability of disturbance to the wafer station and masking station, and it introduces the synchronization control compensation device to reduce the synchronization error, and finally improve the optical engraver accuracy. The invention can not only realize step-and-scan movement required during the scanning exposure process, but also improve the machinery precision and stability. The invention is applicable to optical scan projection optical engraver, and extreme ultraviolet scanning exposure machine, and the synchronous control of other micro-processing equipment.

The invention discloses a method which realizes numerical control finish machining of intersection of large parts of the airplane on the basis of a digital error compensation template, comprising the steps as follows: firstly, a quasi static movement error model thereof is built, all the original errors are measured and obtained, and then a compensation of the quasi static movement error is realized; all machining tasks are carried out under a practical working condition; the comprehensive machining error residual after the first compensation is measured; and the total error compensation value is obtained comprehensively and a corresponding digital error compensation template is built. The machining precision of the intersection of a plurality of airplane wings of the same type is ensured by the repeated movement precision of a machining center. The method has the advantages that the precise numerical control machining center can be adopted to realize the precise machining of the intersection of the large parts of the airplane, the real-time performance is high, the numerical control program and the software and hardware of the machining center are not required to be changed, the advantages of the high precision of the repeated movement of the numerical control machining center is sufficiently played, and the control requirement on the workshop environmental temperature is reduced.

The invention discloses a method for friction compensation of a ball screw feeding system. On the basis that the actual friction phenomenon of the system is analyzed, segmented models of friction torque in speed sections are provided, friction in the low-speed section is modeled through a Steck Berry model, and friction in the high-speed section is modeled through a logarithmic model. Unknown parameters of the friction models are recognized through a hybrid genetic algorithm, the friction compensation amount at the real-time speed is estimated based on the recognized friction models, and friction compensation of the system is achieved in a compensation amount feedforward mode. Through the segmented friction model, friction in the ball screw feeding system is accurately described, the parameters of the friction models are accurately recognized through the designed hybrid genetic algorithm, motion accuracy of the ball screw feeding system is improved based on the feedforward compensation mode of the friction models, and the method can be widely applied to various systems which comprise ball screw feeding mechanisms.

The present invention discloses an air-floating magnetic-control precision motion platform, which comprises a mover platform, a stator platform, a mover thrusting coil, a stator magnet permanent iron array and an x-y directional reflection mirror. The x-y directional reflection mirror is positioned at two sides of the top of the mover platform. The bottom edge of the mover platform is provided with an air-floating hole. The center of the mover platform is provided with a vacuum cavity. The mover thrusting coil is positioned at the inner side of the bottom of the mover platform. The stator magnet permanent iron array is fixed on the stator platform. The entire mover platform floats above the stator platform. The way of the arrangement of the mover thrusting coil is matched with that of the stator magnet permanent iron array. By adopting the air-floating magnetic-control precision motion platform of the present invention, fretting precision and positioning precision of micrometer/nanometer can be realized by the single mover air-floating magnetic-control precision motion platform while the precision motion of multi-working station and large stroke can be realized by a plurality of the mover air-floating magnetic-control precision motion platforms. As the mover platform floats above the stator platform, the mechanical friction between the platforms and the problem of the motion precision of the platform caused by the friction are avoided, and meanwhile a mover coil can be cooled.

The invention relates to an experiment method for jointly and synchronously measuring model motion track, object plane pressure and space velocity field during pitching-rolling two-degree-of-freedom dynamic simulation motion control process. A pitching motion mechanism and a model support rod are simultaneously driven through an industrial personal computer to respectively drive the model to make pitching and rolling motion along preset tracks. When the model moves to a position requiring data acquisition, the industrial personal computer sends an instruction to pressure measuring equipment and PIV (Particle Image Velocimetry) equipment at multiple points, and the actual motion position, the object plane pressure and the space velocity field of the model are collected synchronously. Experiment results show that two-degree-of-freedom coupled simulation motion has high precision under the control of PID (Proportion Integration Differentiation) closed loop feedback, and the error of synchronous measurement can be reduced by transmitting an external trigger signal of synchronous measurement according to a partitioning method. The joint and synchronous experiment technology provides an effective research means for the analysis of the large angle-of-attack unsteady flow mechanism.

The invention relates to an electro-hydraulic servo cylinder, comprising a four-edge sliding valve whose base is mounted with a valve element moving left and right. The valve base is fixed on the cylinder whose piston rod is fixed with the frame; the cylinder is connected with the load. The left driving chamber via tube is communicated with the left working chamber, while the right driving chamber via tube is communicated with the right working chamber; one end of valve element is engaged with the dial block mounted on the straight motion output element of straight motion output device. The digit-control machine with said electro-hydraulic servo cylinder comprises a first axle servo driving system, a second axle servo driving system, a third axle servo driving system and a digit-control system, wherein, the second driving system comprises a straight load axle. The invention has high accuracy, quick steering speed, and stable property, which combines the digit control technique with the electro-hydraulic servo motion, with high accuracy in large power.

A multi-dimensional parallel mechanism vibrating table which relates to middle, small type mechanical vibration measuring field includes a multi-freedom parallel mechanism composed of 3~6 branch chains, a moving platform and a static platform, each branch chain can select one or several motion pairs from revolute pair, shifting pair, column pair, sphere pair or helix pair which are connected by connecting bars therebetween, axes configuration between the motion pairs can be coincident, parallel, upright, intersected or coplane, one end of each branch chain is connected with the moving platform, while another is connected with the static platform. The invention is capable of outputting arbitrary waveform with simple structure, low costs, great firmness, high motion precision and convenience for control.

The invention discloses a three-coordinate positioner with large stroke, high rigidity and high precision. A main pillar and an auxiliary pillar are arranged on a base; a main pillar is provided with a Z-axis transmission unit; a Z-axis telescopic column is connected with the main pillar by the Z-axis transmission unit; the Z-axis telescopic column is connected with the auxiliary pillar by a roller sliding block; the Z-axis telescopic column is provided with an X longitudinal sliding plate and a Y transversal sliding plate; the X longitudinal sliding plate is provided with an X-axis transmission unit; the Y transversal sliding plate is provided with a Y-axis transmission unit; the Y transversal sliding plate is fixed with a bulb clamping device or vacuum adsorption equipment; a process bulb is arranged in the bulb clamping device; the positioner is controlled by a control system; and the main pillar and the auxiliary pillar are provided with lift working tables. The invention can make movement in three directions of X, Y and Z, can realize linkage control and has high movement precision and accurate positioning; the positioner has big safety working stroke and high rigidity; the Z direction is provided with a displacement and force sensor positioner, and thereby, the three-coordinate positioner has stable and reliable support. The three-coordinate positioner is the basic unit for the digital posture adjustment of aircraft components.

The invention discloses a phantom motion platform and a method for processing the motion simulation, wherein the phantom motion platform includes a telemechamic apparatus, a step motor driver and a control device. The telemechamic apparatus is a precise numerical control table matching with two step motors. The step motors are respectively connected with the step motor driver, while the step motor driver and the precise numerical control table are connected with the control device. The method to process the motion simulation is: the parameters of the motion trace, the amplitude and the rotate speed etc are set in advance, and the control device computes the required frequency and sends to the drivers, so the control step motor drives the precise numerical control table to move. The invention has simple structure, high kinematic accuracy, which can process the straight line, the diamond and ellipse motion having different frequency and amplitude, and systematacially simulate the motion of the human body apparatus, and provides effective means for the clinical diagnosis, quality assurance and the quality control.