79results about How to "High speed accuracy" patented technology

The invention discloses a fracturing pump, comprising a cooling device and a control device, wherein a motor is connected on an shaft of the fracturing pump, the cooling device comprises an air-cooled device for cooling a rotor of the motor and a water-cooled device for cooling a stator of the motor, and the control device is connected with the motor and the cooling device, respectively. The fracturing pump in the invention adopts a structure directly driven by the motor, thus breaking the form of a transmission structure of a diesel engine of the conventional fracturing pump added with a transmission tank, simplifying the structure of the entire fracturing pump, reducing the apparatus mounted on a fracturing car, decreasing failure rate of the apparatus, and becoming more safe and reliable.

Geophysical exploration for oil wells, the source from the vertical seismic profile aspect wave data stack depth domain Corridor profile approach is the use of in situ collection of well spacing VSP data, which will all receive points drilling depth of information and hierarchical data with the depth of information, the use of direct wave VSP data travel through and optimization algorithms are highly accurate anti-layer velocity model, the direct wave to the beginning of the reflected wave in the vicinity of the depth and precision homing imaging, further in-depth domain Corridor section and with the superposition of alternative conventional method leveled in the time domain, with corridors and the superposition method, the results can be superimposed for direct comparison with the drilling and seismic data stratified layer identification. More intuitive, but also made full use of VSP data in the depth of information, make geological formation of the earthquake response and drilling, logging data in depth domain direct contrast, a more intuitive geological layer and the relationship between seismic horizon, thereby enabling layer of identification and calibration more reliable.

A mixed speed regulating method of permanent magnet synchronous motor includes applying self-control vector to control speed when permanent magnet synchronous motor is started up and switching said self-control of speed regulation onto separate- control of speed regulation when said motor enters steady-state and feedback rotary speed is on set speed value, outputting voltage vector of relevant frequency directly according to set speed when separate-control of speed regulation is applied and making control of speed regulation be in matching to that speed is controlled by open-loop control.

A wavelength-selectable laser with a resonance region formed by two reflecting surfaces include a gain medium generating a laser beam, a first filter, and a second filter. The first filter has a first controllable transmission region and transmits a first predetermined wavelength region of the laser beam generated in the gain medium, the first predetermined wavelength region matching the first controllable transmission region. The second filter has a plurality of periodically arranged second transmission regions and transmits a second predetermined wavelength region of the laser beam transmitted by the first filter, the second predetermined wavelength region matching one of the second transmission regions.

An injection molding machine for bimaterial molding equipped with two sets of injection units (11,12) capable of plasticization and injection filling of different resin materials, respectively, which injection molding machine comprises, as mold clamping means, hydraulic mold clamping means for simultaneously clamping three sets of die plates (2,3,9); as movable die plate opening/closing means (14), movable die plate opening/closing means driven by an electric motor; as rotary die plate opening/closing means (15), rotary die plate opening/closing means (14) driven by an electric motor; and, asrotating means for a rotary die plate (9), rotational driving means driven by an electric motor mounted on a reversal pedestal (7).

A control unit includes a memory storing correction data obtained by associating information acquired by a first acquisition unit (rotary encoder) with information acquired by a second acquisition unit (direct sensor) with respect to, at least one rotation of a conveying roller. When a plurality of images are sequentially printed on a first surface and a second surface of a continuous sheet, the control unit reads the correction data corresponding to the rotation information acquired by the first acquisition unit from the memory and corrects at least one of driving control of a print head and driving control of the roller. The correction data used in printing on the first surface of the sheet is different from that used in printing on the second surface of the sheet.

The invention provides an SINS/DVL/ES combined navigation method based on information pre-evaluation and navigation result compensation correction. DVL data validity is judged before SINS/DVL combination, and when the DVL data information is invalid, DVL navigation information does not participate in combined navigation; at the same time, a residual error x2 testing method is introduced for evaluating whether combined navigation results are stable, and a compensation correction method is designed for real-time evaluation and correction compensation of Kalman output results when the combined navigation results are oscillated. The combined navigation method can effectively suppress the divergence speed of the SINS/DVL combined navigation attitude and speed, improves the combined system attitude and speed accuracy, improves the position accuracy in a certain extent, and also can solve the oscillation problem of attitude errors brought by declining of the DVL data information quality.

The invention relates to a formation speed test system and test method. The system comprises a high-energy electric spark source, a plurality of ground detectors, one to two receiving lines, a seismograph and a triggering timing device. According to the formation speed test system of the invention, high-energy electric spark is excited in a hole, and the plurality of detectors are linearly arranged on the ground to receive seismic waves. The test system has strong excitation energy and high main frequency; the test system receives longitudinal wave first arrivals in a multi-channel manner, which realizes easiness in distinguishing; the test system can pick up first arrivals in a common-excitation point and common-receiving interactive pickup manner, so that longitudinal and transverse wavefirst arrival time can be picked up; a speed obtained through a tomographic inversion method has high precision; the formation speed test system and test method are not only suitable for soil layers,but also suitable for rock formations; and a formation speed acquired by the test system and test method is accurate and reliable and is similar to a result obtained by an in-situ wave speed test.

Embodiments of the present disclosure provide a text detection method and apparatus, and a storage medium. The method includes: obtaining edge information of a to-be-detected image; and determining candidate text pixels in the to-be-detected image according to the edge information of the to-be-detected image by using a preset candidate text pixel determining strategy. The method also includes performing projection based segmentation on the candidate text pixels to obtain a projection based segmentation result. The method also includes determining one or more text regions in the to-be-detected image according to the projection based segmentation result.

A surface texture measuring instrument includes a contact piece to be in contact with an object, a sensor driving mechanism that moves the contact piece along the surface of the object, a controller that controls the sensor mechanism, and a force sensor that detects a measuring force exerted on the contact piece when the contact piece is brought into contact with the object. The controller includes a target value output that outputs a target value of the measuring force, a feedback controller that performs feedback control of the sensor driving mechanism based on a deviation between the measuring force and the target value, and a feedback compensator provided on the feedback controller. The feedback compensator performs feedback compensation in accordance with the measuring force.

The invention provides a measurement circuit for the rotation speed for a CW type electric eddy current dynamometer, which comprises a revolution speed transducer, a rotation speed signal processing module, a control module and a display module, wherein the rotation speed signal processing module comprises a signal processor (PICI6F877) and a rotation speed signal arranging circuit; a signal output end of the revolution speed transducer is connected with a rotation speed signal input end of the signal processor through the rotation speed signal arranging circuit; a display signal output end of the signal processor is connected with a display signal input end of the display module; and a control signal input end of the signal processor is connected with a control signal output end of the control module. The measurement circuit has the advantages of high measuring accuracy and stable performance, and is suitable for different types of the CW type electric eddy current dynamometer. The invention also provides a measurement method for the rotation speed, which comprises the following steps: segmentally collecting the rotation speed in low rotation speed and high rotation speed respectively; and reducing computation workload in the low rotation speed, improving the measuring accuracy in high rotation speed, and achieving the aims of performing operation monitoring control in the low rotation speed and alarming when running at overspeed.

The invention belongs to an air path control technology, and particularly relates to a fast pneumatic valve applied to air path control. The fast pneumatic valve comprises a valve body, a cone valve, electromagnetic valves, a separation plate and a gun barrel, wherein the cone valve and the separation plate are arranged in the valve body, a first air chamber is separated by a piston of the cone valve and the valve body, a valve head of the cone valve passes through the separation plate and can be matched with an opening of the gun barrel, a space among the cone valve, the separation plate and the valve body is a second air chamber, a third air chamber is formed between the separation plate and the valve body, in addition, the first air chamber is communicated with external atmosphere, and the third air chamber is communicated with a main air chamber used for emitting the gun barrel. Meanwhile, each air chamber is respectively provided with the electromagnetic valves used for controlling the air path closing. The fast pneumatic valve has the advantages that the cone valve movement is irrelevant to the work pressure, so the repeatability of the fast pneumatic valve is better, the speed precision of an air cannon device can be effectively improved, the piston lifting movement is smoother, the clamping cannot easily occur, and the low-speed capability of the air cannon device can be effectively improved.

In a neural network, hidden layers are modified by supplying input data, an output label, and internal teaching labels to the neural network; causing the neural network to process the input data through the hidden layers and outputting a result of the processing for comparison with the output label; supplying the internal teaching labels to the hidden layers and calculating scores for the hidden layers based on the internal teaching labels; and modifying the hidden layers or hidden nodes based on the calculated scores and the comparison of the processing result with the output label. The modifications to the hidden layers or hidden nodes may involve pruning hidden nodes by dropping lower scoring nodes; reducing a number of bits in computations and outputs; reducing a number of bits in selected nodes; bypassing lower scoring nodes; modifying activation functions of the hidden nodes based on the calculated scores; and/or adding hidden layers or hidden nodes.

A system and method for the detection of ROIs in images obtained of a breast or other tissue of a patient significantly improves the speed and precision/accuracy of navigation between multimodality 2D and 3D images. In the system and method, images of the tissue are obtained in a DBT acquisition to generate a synthetic 2D image of the imaged tissue and in a 3D, e.g., ultrasound, image acquisition. The 2D image generation process creates a synthetic 2D image that embed a navigation map correlating pixels in the 2D images to sections of the 3D ultrasound volume, such as via a registration between the 3D ultrasound volume and a 3D volume created using the DBT image data. When a synthetic 2D image is reviewed, an ROI on the 2D image is selected and the system will additionally present the user with the section of the 3D volume containing that ROI.

The invention discloses an aerial high precision rotation rate source power angle controlling method, which comprises the following steps. Firstly, a triphase Hall position sensor arranged on a permasyn motor transmits the measured power angle triangle of the motor to a power angle comparer for comparison with the set power angle triangle 0; when the warp of the power angles is less than the set value, PI regulation output is 0; when the warp of the power angles is more than the set value, the power angle is controlled to approach the set power angle. Secondly, the steady operation power angle of the permasyn motor is set to be less than 90 degrees and more than 0 degree. Thirdly, when disturbance of loads increases suddenly, the motor slows down; the output voltage of an inverter is increased, and the motor works stably after several damped oscillations; when disturbance of loads is eliminated, the motor speeds up, and then works stably after several damped oscillations. By adopting closed-loop control of power angle, speed precision of the motor is higher than 0.5 rpm within the range of speeds of rotation from 50 rpm to 9000 rpm. In addition, the invention solves the problems of loss of synchronism and heating of the motor.

The invention discloses a control device for automatic distribution of a sea surface oil spilling oil containment boom. The control device comprises a programmable logic controller, and further comprises a first hydraulic motor and a second hydraulic motor. The programmable logic controller is connected with a first proportional valve through a first proportion amplifier, the first proportion amplifier is connected with the first hydraulic motor, and the first hydraulic motor is connected with a first reduction box; the programmable logic controller is connected with a second proportional valve through a second proportion amplifier, the second proportion amplifier is connected with the second hydraulic motor, and the second hydraulic motor is connected with a second reduction box. The invention further discloses a control method for automatic distribution of the sea surface oil spilling oil containment boom. Influences of stress unevenness of the two motors on a system can be effectively reduced by the adoption of an equivalent control mode, the anti-interference capability of the system is improved, finally, the purpose that speeds of the two hydraulic motors stressed unevenly are proportional to each other is achieved, coordination control over the revolving speeds of the two motors in an equivalent control mode is achieved, and the automation level and the control accuracy of the system are improved.

The invention relates to an interval velocity inversion method for earthquake waves for processing earthquake exploration data, comprising the steps of receiving the data underground and obtaining VSP (Vertical Seismic Profiling) data, picking each first arrival and integer time, calculating the first arrival difference of adjacent integer sampling points, carrying out median filter wave field separation of the VSP data and obtaining down-going waves and leveling the down-going waves; opening one time window from the first sampling point; carrying out Fourier transform on a signal to obtain the phase spectrum of each frequency; getting the phase spectrum difference of the same frequency in adjacent channels; obtaining the first arrival second difference of non-integer sampling points of the adjacent channels by least square fit; summing the first arrival first difference and the first arrival second difference to obtain the first arrival difference; and obtaining the interval velocity by dividing the depth difference of the adjacent channels by the final first arrival difference of the adjacent channels. The method has strong ability resisting to immediate (random) interference; the algorithm is simple; and the inversion interval velocity has high precision.

The invention discloses an injection molding machine for molding double materials and a control method thereof. The injection molding machine comprises two groups of injection units (11, 12) used for respectively plastifying different resin materials for injection filling, wherein a mold clamping mechanism is a hydraulic mold clamping unit which can simultaneously clamp three groups of molding plates (2, 3, 9); a movable molding plate opening-closing unit (12) is driven by a motor; a rotary molding plate opening-closing unit (15) is a rotary molding plate opening-closing unit (14) which is driven by a motor; a rotary unit of the rotary molding plate (9) is a rotary driven device which is driven by a motor mounted on a reverse table (7).

A control mode is made into an easy adjustment corresponding to the load state or drive state of an inner side rotating body, and a better control mode is realized through an easy and compact structure. A magnetic coupling controlling means (10) comprises an outer side function body (10MT) of a rotor part (12) capable of rotating in an inner periphery, an inner side rotating body (14) which is disposed with intervals at the periphery side of the rotor part, tubings (P) of tube wall which are disposed between an external function body and an inner side rotating body, a magnetic coupling structure which is provided with a plurality of external side magnetic poles (12c) arranged around an axis in an inner periphery of the rotor part, and a plurality of internal side magnetic poles (14b) which match with the plurality of external side magnetic poles at the external periphery of the inner side rotating body and are arranged through magnetic coupling in a rotating direction, phase difference detection units (15, 16, 120) which detect the phase difference between the external side magnetic pole and the internal side magnetic pole, and external side function body control units (103, 106, 107) which control the external side function body based on the phase difference.

The invention relates to an in-situ detection device of an anti-skidding electrical control system, comprising a rotational speed sensor, an anti-skidding control system, a main undercarriage damping signal acquisition device, a brake valve and a tester, wherein, the tester comprises an amplifier, a band-pass filter, a detector, a first conditioning circuit, a second conditioning circuit, a thirdconditioning circuit, a logic comparison circuit and an electrical second meter, wherein, the rotational speed sensor, the amplifier, the band-pass filter, the detector and the logic comparison circuit are connected in sequence; the anti-skidding device, the first conditioning circuit and the logic comparison circuit are connected in sequence; the main undercarriage damping signal acquisition device, the third conditioning circuit, and the logic comparison circuit are connected in sequence; and the logic comparison circuit is connected with the electrical second meter. Compared with the priorart, by using the method provided by the invention, the advantages of detection precision and the like of the performance of the anti-skidding electrical control system is improved.

The invention discloses a high-speed dynamic balance driving system for a large steam turbine rotor. The driving system comprises a master motor and a slave motor, wherein the master motor is a motor with double extension shafts, is coaxially connected with the slave motor through a motor shaft at one side of the master motor in series and is connected with an acceleration gearbox through a motor shaft at the other side of the master motor, the acceleration gearbox is connected with the rotor and is connected with a barring gear, the master motor is connected with a master frequency converter, the slave motor is connected with a slave frequency converter, and the master frequency converter and the slave frequency converter are connected with a controller; rotating speed sensors are arranged on the master motor, the slave motor and the rotor and are connected with the controller. The high-speed dynamic balance driving system for the large steam turbine rotor can realize the closed-loop control, effectively improve the accuracy of the high-speed balanced rotating speed of the large steam turbine rotor and increase the acceleration speed of a dynamic balance system. The driving system has the advantages of simple structure, convenient operation, high work efficiency, convenience for repair and maintenance and capability of effectively reducing the test cost.

A polishing device having a table connected to a traction drive type reduction gear. The reduction gear includes an externally contacting shaft formed in a ring-shaped hollow cylinder and arranged at the center; a plurality of intermediate shafts which are equidistantly disposed at the circumference of the externally contacting shaft, at least one of which is an input shaft; and an internally contacting cylinder with which the intermediate shafts internally contact, and under free conditions, the externally contacting shaft formed in a hollow cylinder has a diameter which is a little bit larger than a diameter of an imaginary circle which externally contacts with a plurality of intermediate shafts whereby pressing load is created by means of deformation of the hollow cylinder.

The invention discloses a wide-rotation speed range and multi-induction source transmission device and belongs to the technical field of automobile transmission. The wide-rotation speed range and multi-induction source transmission device is mainly used for solving the problem that the full rotation speed range performance test of the engine sensor cannot be carried out by the traditional sensing device. The wide-rotation speed range and multi-induction source transmission device is mainly characterized by comprising a bottom plate, a motor support, a frequency conversion motor, a support plate, a bearing pedestal holder and an end face adjusting component stand, wherein a first bearing and a flywheel shaft are arranged between an upper support plate and a lower support plate in the support plate; a lower bearing pedestal, an upper bearing pedestal and a second bearing are arranged on the bearing pedestal holder; one end of the flywheel shaft is linked with the frequency conversion motor, and the other end of the flywheel shaft is provided with a gear and an end face flywheel; an elastic cylindrical pin, a shaft and an end cover are arranged in the second bearing; an end face adjusting component and a radial adjusting component are arranged on the end face adjusting component stand. The full rotation speed range performance test of the engine sensor can be carried out by the wide-rotation speed range and multi-induction source transmission device, and the wide-rotation speed range and multi-induction source transmission device also has the characteristic of high rotation speed precision. The wide-rotation speed range and multi-induction source transmission device is mainly used for performance test of various rotation type sensors of the automobile.