103results about How to "Eliminate jumping" patented technology

The invention is a bridge-free power factor correction (PFC) converter able to reduce common code noises and increase power density, comprising: boost inductor coupled to input end; two-way switch connected in series with the boost inductor and having junction node coupled between the boost inductor and two-way switch; second series rectifier circuit, having junction node coupled to the two-way switch; and output capacitor connected in parallel with the second series rectifier circuit; where the second series rectifier circuit is composed of slow recovery diode and the first series rectifier circuit is composed of fast recovery diode. Thus, the invention can reduce common mode noises in the converter and increase the power density of the converter.

The invention provides an online finishing and morphology detecting device for a grinding wheel for performing ultrasonic electrolytic combined grinding on inner circles. The online finishing and morphology detecting device comprises a machine tool worktable and a machine tool spindle, wherein the machine tool worktable is provided with a grinding wheel shaping device and a grinding wheel morphology online observing device; the speed of the grinding wheel shaping device can be regulated in a frequency converting manner; the grinding wheel morphology online observing device can be used for movably observing the morphology of the surface of the grinding wheel in an online manner; the machine tool spindle is provided with an ultrasonic vibration tool system; an outer ring fixing sleeve is arranged outside the machine tool spindle; an ELID (electrolytic in-process dressing) online dressing device is arranged on the outer ring fixing sleeve; the ELID online dressing device and the machine tool spindle rotate synchronously; and the ultrasonic vibration tool system and the ELID online dressing device are positioned between the grinding wheel shaping device and the grinding wheel morphology online observing device. While ultrasonic vibration grinding is realized, ELID grinding wheel online finishing or grinding wheel online observing can be performed according to working requirements, a multi-process combined high-efficiency mirror finishing technology is formed and is a technical support for application of high-efficiency machining to ultra-smooth surfaces of crisp and hard materials in the field of advanced technologies such as national defense and aerospace, and the theoretical value and the practical value are important.

A torsional vibration damper includes a one-piece integral hub and annular inertia mass assembly. Between the hub and the inertia mass are intermediate rings connected integrally with the mass and the hub connected integral spokes. Elastomeric members are compression fitted within spaces formed between the hub and the mass. With this design, the damper can be formed from a polymeric material with an embedded annular weight.

The invention relates to a handheld drilling machine with a dust removal device. The handheld drilling machine comprises a drilling machine shell, a drill chuck, a drill bit and the dust removal device. The dust removal device comprises a dust collection base, an aligning rubber sleeve, a fan blade and a dust collection box, wherein the fan blade is installed in the dust collection base through a bearing, an inner circular conical surface opened backwards is arranged on the fan blade, the aligning rubber sleeve is arranged on the drill bit in a penetrating mode and rotates along with the drill bit, the circumference of the aligning rubber sleeve is an outer circular conical surface, and the outer circular conical surface can be attached to the inner circular conical surface of the fan blade to drive the fan blade to rotate; the fan blade sucks external air in or exhausts internal air when rotating, an air channel used for controlling the flowing direction of the air is formed in the dust collection base or the dust collection box, and through the flowing of the air, dust generated in the hole drilling process is thoroughly brought into the dust collection box. The handheld drilling machine is reasonable in structure, small in size and low in cost and can prevent the drill bit from driving the fan blade to jitter, and the dust is removed more thoroughly.

A torsional vibration damper includes a one-piece integral hub and annular inertia mass assembly. Between the hub and the inertia mass are intermediate rings connected integrally with the mass and the hub connected integral spokes. Elastomeric members are compression fitted within spaces formed between the hub and the mass.

The invention relates to a method of detecting glass defects based on a phase image processing. The method utilizes a glass defect detection system based on the phase image processing; and comprises that light emitted from a light source passes through a raster and forms moire showing a cosine distribution of light intensity on surfaces of to-be-detected glasses, a high-speed linear-array camera collects the moire patterns on the surfaces of the glasses which are then transmitted to an industrial control computer through an image acquisition card, and a defect detection and processing software installed on the industrial control computer timely processes the moire patterns to obtain binary defect images. The method is characterized by firstly subtracting corresponding points of main value images of reference phases respectively containing glass defects and being free of defects, eliminating hopping in the subtraction results by using a hopping error correction algorithm, segmenting into binary images for the glass defects through a mathematical morphology and a segmentation algorithm of combined high and low thresholds, and finally determining the glass defects according to data of the binary images. The method can greatly reduce influences of system noises, improve an operation speed and realize rapid and accurate detection for the glass defects.

The invention proposes a calculation method for a battery electricity quantity of a battery system. The method includes the following steps: a. obtaining a current sampling mode of the battery system, wherein the battery system has a plurality of sampling modes and each sampling mode has a corresponding sampling frequency and voltage value storage queue; b. according to a sampling frequency corresponding to the current sampling mode, sampling the voltages of the battery system and storing the sampled voltages to the voltage value storage queue; c. judging whether the voltage value storage queue is full; and d. if the voltage value storage queue is full, calculating a first sampling voltage success value according to the plurality of sampling voltages in the voltage value storage queue and calculating the battery electricity quantity according to the first sampling voltage success value. The calculation method for the battery electricity quantity of the battery system is capable of eliminating jumps and improving the detection precision of the electricity quantity. The invention also proposes a calculation device for the battery electricity quantity of the battery system.

The invention belongs to the field of aerospace craft guidance, and aims to enable an RLV to still obtain a guidance instruction enabling a track to strictly meet heat flow, overload and dynamic pressure constraints under the condition that the RLV is affected by external disturbance and uncertain factors, and finally land at an appointed runway position at a proper speed. Therefore, the technicalscheme adopted by the invention is as follows: the full-stage reentry return guidance method for a reusable launch vehicle comprises the following steps of: 1, guidance of an initial descending section; 2, gliding section guidance; 3, guidance of a terminal energy management section; 4, automatic landing section guidance: keeping the heeling angle to be 0 in the transverse direction; in the longitudinal direction, the automatic landing section is designed to be formed by combining a quasi-balanced gliding section and an exponential gliding section, an attack angle instruction is determined bydesigning a track angle function, and the height of a switching point of the two sections is designed through a secant method, so that the RLV can make contact with the ground at a preset speed and atrack angle. The method is mainly applied to aerospace craft guidance occasions.

The invention relates to the reasonable research on the arrangement of road traffic identifier markings, in particular to a method for establishing a simulation experiment platform of a road traffic virtual identifier marking, comprising the following steps: firstly, a camera is utilized to simulate the visual field of a driver and shoot the scene video of an actual road as the original video; secondly, the path tracking parameters of the camera are obtained; then, a drawn identifier marking line is added on to the original video by utilizing the function of adding a camera of Maya software to obtain the real scene video with virtual identifier marking as the simulation scene after video synthesis and rendering process; and finally, the simulation video is input into a simulation driving system and matched with a driving simulator, and then the simulation experiment on virtual identifier marking based on road real scene video can be carried out.

The invention relates to a method for selecting a reference field and a time-domain motion vector in a jump or direct mode. The method comprises the steps of: firstly, judging a current macro-block type and a current subblock type, and then performing the following operations according to different types: assigning values to different numerical values of a current block according to the image structure of the current block; defining opposite-field perpendicular vector offset compensation; defining block distance formulas between a backward reference block and self / forward / backward reference blocks; assigning a value to mvRef_y; and calculating the forward / backward motion vator of the current block according to the formula and the assigned value. The backward motion vector mvBw of the current block can be calculated by using the method in such a way. For a typical interlaced video sequence, when the direct and jump modes are more suitable, the method disclosed by the invention can be used for increasing the coding efficiency by 10% and 20% totally with a very obvious effect. In addition, the method disclosed by the invention can be used for eliminating serious jump distortion for low field videos, and the subjective evaluation scoring for a code stream of original AVS (Audio Video Standard) reference grade field coding can be greatly increased.

The invention discloses a high-precision satellite pulse per second synchronous punctuality device and method. The method is characterized in that phase difference detection of 1PPS signals is realized by using flip phase discrimination in the process of realizing synchronous punctuality, and the output phase of 1PPS is accurately controlled in real time by combining stepping compensation and phase shift alignment so that an accumulated error of a local clock and hopping of satellite 1PPS signals are well eliminated, high-precision synchronous punctuality is realized, during satellite synchronization, synchronization precision of 1PPS output is superior to 16ns; when a satellite is disconnected, the local punctuality is 24 hours, the error is less than 3 microseconds, moreover, online configuration of the output 1PPS pulse width is supported.

The invention belongs to the technical field of machine tool clamps, and particularly relates to a clamp with a repeated clamping function for a numerical control machine tool. The clamp comprises a chuck, clamping jaw mechanisms, first adjusting rods and a coiled wire. According to the designed clamp, during adjustment, firstly, eight clamping blocks in four clamping jaws slightly clamp a workpiece by driving one of the three first adjusting rods, but a spindle can drive the workpiece to rotate through the clamp under the clamping force, but the clamping force is not clamping force during turning work, a worker can observe the installation condition of the workpiece under the clamping force to judge whether the workpiece jumps or not, then each adjusting mechanism is controlled to adjust two adjusting blocks on the corresponding side according to the jumping condition, then the adjusting blocks extrude two corresponding clamping jaws, and four clamping blocks in the two clamping jaws adjust the installation state of the workpiece upwards or downwards or leftwards or rightwards through respective swinging, so that the final machining precision of the workpiece is guaranteed.

Disclosed is a system for comprehensively measuring multiple parameters of a fiber optic interferometer. The system comprises a semiconductor laser unit with tunable narrow linewidth, an opto-isolator, the interferometer, a carrier wave circuit, a photoelectric detector, a data acquisition card and a data-processing machine, wherein the semiconductor laser unit is used for providing transmission signal light, the input end of the opto-isolator is connected with the output end of the semiconductor laser unit with the tunable narrow linewidth, a port 1 of the interferometer is connected with the output end of the opto-isolator, the interferometer is used for reducing the influence of rayleigh scattering light on the laser unit so as to protect the laser unit to work stably for a long time, the output end of the carrier wave circuit is connected with a port 3 of the interferometer, the carrier wave circuit is used for providing the interferometer with PZT modulating signals, the input end of the photoelectric detector is connected with a port 2 of the interferometer, the input end of the data acquisition card is connected with the output end of the photoelectric detector, the data acquisition card is used for converting received optical signals into electric signals, the input end of the data-processing machine is connected with the output end of the data acquisition card, and the data-processing machine is used for processing digital signals collected by the data acquisition card and giving out parameter values through nonlinearity minimum least squares and fitting by using visibility, modulation amplitude and initial phase difference as undetermined parameters.

The invention discloses an inner armature type high precision positioning electromagnet which comprises a shell, an armature, a coil, an end cover and a positioning shaft. One end of the shell is sealed through the end cover, three supporting assemblies are arranged at the end, far away from the end cover, of the shell, bearings of the three supporting assemblies are all tightly attached to the positioning shaft, and the positioning shaft can move freely in the axial direction of the positioning shaft. Two supporting assemblies are fixed supporting assemblies, another supporting assembly is a movable supporting assembly, and a kidney-shaped hole is formed in a supporting block of the movable supporting assembly in the length direction of the supporting block. A screw sequentially penetrates through a pressing plate and the kidney-shaped hole and then is connected with the shell. A compressed spring is arranged at the end, far away from the positioning shaft, of the movable supporting assembly, one end of the compressed spring is fixedly connected with the shell, and the other end of the compressed spring is tightly pressed on the supporting block of the movable supporting assembly. By means of the inner armature type high precision positioning electromagnet, gap variation caused by temperature variation can be compensated automatically, and high positional accuracy and low temperature drift are achieved.

The invention relates to a structure for reducing pressure and subsidence of behind-abutment earth for a bridge and a construction method thereof. The structure comprises a bridge abutment, wherein the bridge abutment supports a main beam; the abutment front side of the bridge abutment is provided with an in-front-of-abutment revetment; the abutment rear side of the bridge abutment is provided with behind-abutment filling earth; a corrugated plate which is vertically arranged is arranged between the bridge abutment and the behind-abutment filling earth; concave parts and convex parts in the corrugated plate are vertically alternately arrayed; the concave parts are filled with shrinkable materials in two sides of the corrugated plate. The structure is used for effectively preventing the behind-abutment earth from generating subsidence and falling off, preventing a behind-abutment splice plate from generating the subsidence, eliminating distress of bumps at bridge-head and the like, improving running safety and smoothness and decreasing a maintenance cost of the bridge, can be used for improving an entire lifecycle of the bridge, is used for prolonging and improving a service life period and the traffic capacity of the bridge, has advantages of simple structure, high universality, convenient construction and the like, and meanwhile, has important practical significance and engineering application value.

A presser inspection well cover comprises a flexible structure and a rigid structure, wherein the presser inspection well cover mainly comprises a bovine ear type well seat (4), an anchor bolt assembly (1), an elastic pressure plate (2), a three-oil two-network plastic washer (3) and a concrete well cap (5), wherein the lower end of the anchor bolt assembly (1) is anchored in the concrete well cap (5) and positioned outside the bovine ear type well seat (4), the three-oil two-network plastic washer (3) is cushioned between the bovine ear type well seat (4) and the concrete well cap (5), the elastic pressure plate (2) is sleeved on the anchor bolt assembly (1), one end of the elastic pressure plate (2) is against the bovine ear type well seat (4) and the other end is against the supper surface of the concrete well cap (5), and a rigid presser inspection well cover is internally provided with at least one three-oil two-network plastic washer (3). The invention can effectively eliminate the flexible road slit and the rigid road broken edge around an inspection well, prolongs the service life of the road, saves the road building and maintenance cost, and saves the fuel cost and the maintenance cost of an engine.

A high-voltage power supply for the electrostatic oil soot exhauster is composed of input rectifier, power amplifier, high-voltage transform circuit, high-voltage output rectifier, amplitude modulator, and frequency modulator.

The invention relates to research of setting reasonability of road traffic virtual signs and marks, in particular to an establishing method of a simulation test platform of the road traffic virtual signs and marks. The method comprises the following steps: first, shooting a scene video of an actual road by simulating the view of a driver by a vidicon as an original video; second, obtaining path tracking parameters of the vidicon; then, adding drawn signs and marks to the original video by an adding vidicon function by Maya software, and obtaining a real scene video with virtual signs and marks through video synthesis and rendering as a simulating scene; and finally, inputting the simulating video into a simulating driving system to be matched with a driving simulator, so that the simulation test of the virtual signs and marks based on the real scene video can be carried out.

The invention relates to a yarn tensioner of a nylon zipper sewing machine. The yarn tensioner of the nylon zipper sewing machine comprises a yarn feeding wheel, a yarn discharging wheel and a tension control assembly, wherein the tension control assembly comprises a mounting seat tension wheel and a back tension wheel; the yarn feeding wheel, the back tension wheel and the yarn discharging wheel are separately arranged on a mounting seat transversely in a spaced manner; a yarn body winds the front tension wheel and the back tension wheel in a spaced manner; the yarn body winds the front tension wheel and the back tension wheel by arranging the front tension wheel and the back tension wheel to eliminate jumping of the yarn body; and in conditions that when the number of winding rings of the yarn body on the front tension wheel and the back tension wheel is one, although the yarn body is of a sort of jumping, and when the number of winding rings are two and three, the poor jumping of the yarn body is substantially eliminated, the yarn tension value is stabilized, and meanwhile, the yarn interrupting rate is decreased, and the product quality is further enhanced, so that the production line equipment is more reasonable in automation.

The invention relates to a handlebar, and discloses a hook-type front fork and handlebar fast disassembly bicycle structure comprising a handlebar stand, the lower part of which is provided with a frame head tube and a headset. The lower end of the handlebar stand is provided with a front fork, and the upper part of the handlebar stand is provided with a bolt, which is in a threaded connection with a nut. The upper part of the front fork is provided with a front fork head tube vertical tube pin shaft, which is connected with a clamping slot disposed in the bottom part of the handlebar stand ina clamped manner. The upper part of the handlebar stand is provided with a handlebar pin shaft hole, which penetrates a connection pin shaft. The pin shaft is rotatably connected with a hook throughhole in the upper end of the hook, and the upper part of the hook is provided with a button. The lower part of the hook is slidably connected with a guiding slot disposed in the middle part of a maintaining rack, and the left side of the maintaining rack is provided with a maintaining rack side hole. The technical scheme provided by the invention is suitable for the hook-type front fork and handlebar fast disassembly bicycle structure, and by arranging the hook, the handlebar is connected with the front fork, the whole connection is firm, and the clamping is prevented from being loosened, andtherefore the radial jump is eliminated. The whole device has advantages of simple operation, convenient disassembly, and applicability in popularization and application.

The invention relates to a multi-frequency heterodyne phase unwrapping error compensation method, belongs to the field of 3D measurement of structured light, and mainly aims at solving the problem ofjump of pixel points generated by phase unwrapping. Direct roundup of m12 is replaced by m12'(1) and m12'(y+1), and compared with direct roundup of m12, jump points are eliminated completely, a step graph is completely continuous, a phase unwrapping graph of the whole grating stripes is continuous, smooth and jump-free, and a stripe image projection process is not influenced by the environment andis more stable.

The invention discloses a head of a pantograph. The head of the pantograph comprises a supporting structure, a roller structure and a connecting structure, wherein the roller structure can be contacted with a contact line to realize the conduction with the contact line, and the cylinder structure rolls in the axial direction of the contact line; and the connecting structure is used for connectingthe roller structure and the supporting structure, and the connecting structure enables the roller structure to move on the supporting structure in the radial direction of the contact line. Accordingto the head of the pantograph, the sliding friction between a sliding plate of the head of the pantograph and the contact line in the horizontal direction and longitudinal direction is avoided, the current collection effect between bow nets is greatly improved, and at the same time, the maintenance and overhaul are convenient, and the maintenance cost is reduced.

The invention relates to an integrated imaging light field information acquisition and display method which comprises the following steps: establishing an integrated imaging model which comprises a detector, an acquisition micro-lens array, a display screen and a display micro-lens array; acquiring three-dimensional light field information of n different viewing angle areas of each acquisition micro lens through the detector, and generating a micro-unit image array, wherein n is greater than or equal to 2; equally dividing the persistence time of human vision into n time periods, wherein n isgreater than or equal to 2; and taking the micro-unit image array as a data source of the display screen, and sequentially displaying the micro-unit images corresponding to the ith viewing angle areaof each display micro-lens in a three-dimensional space in the ith time period, wherein i = 1, 2,..., n. According to the method, the tunable backlight direction and display screen content refreshingcan be accurately controlled, the micro-unit image information of different observation view angles is loaded at different moments within the human eye vision persistence time range, the crosstalk phenomenon is eliminated, and crosstalk light is converted into useful reproduced images.

The invention provides a novel bridge connecting plate structure and construction method. The structure comprises main beams and connecting plates, the main beams are adjacently arranged, the connecting plates are arranged between the main beams, piers are arranged on the lower portion between the upper adjacent main beams, the adjacent main beams are connected through the connecting plates, the vertical cross section of each connecting plate is in a wedge shape, and connecting reinforcing steel bars are arranged in the connecting plates and extend into the adjacent main beams. According to the structure, displacement and corners of the main beams in a vertical bridge direction can be effectively absorbed, horizontal deformation between the main beams is converted into vertical deformationof the connecting plates, the deformation amount is greatly decreased, the horizontal deformation amount between the main beams is dispersed into two ends of each connecting plate, deformation requirements can be met, good waterproof performance is achieved, driving safety and smoothness is ensured, cracking of the connecting plates between the main beams is prevented, defects such as bumping atconnecting sections of the main beams is removed, the life cycle of a bridge can be prolonged, the passing capability of the bridge is improved, the structure has the advantages of simple structure, high universality, convenience in construction and the like, and the structure has great engineering significance and practical values.

The invention discloses a linear output ventilator control method based on movable blade and rotating speed coupling adjustment. The linear output ventilator control method comprises the following steps that a changing curve of the fan rotating speed along with a current value of a motor and a changing curve of the angle of movable blades along with the current value of the motor are fitted; and acurrent current value of the motor is obtained, according to the current current value of the motor, a given value of the fan rotating speed and a given value of the angle of the movable blades are obtained through the changing curve of the fan rotating speed along with the current value of the motor and the changing curve of the angle of the movable blades along with the current value of the motor which are obtained through fitting in the step 2, then the fan rotating speed and the angle of the movable blades are controlled according to the given value of the fan rotating speed and the givenvalue of the angle of the movable blades, and control over a linear output ventilator based on movable blade and rotating speed coupling adjustment is achieved. The method can improve the fan adjusting precision.

The invention discloses a magnetic suspension bearing high in reliability. The magnetic suspension bearing comprises a bearing body, an electromagnet, a stator disc, a first stator, a first damping ring, a rotor, a magnet, a limiting groove, a dynamic monitoring device, a second damping ring, a rotor sleeve, a position monitor, a second stator, a display screen, a connecting line, a starting switch, a laminating block, an embedded plate, an oil storage layer and a guide hole; the stator disc is arranged in the bearing body, the rotor is arranged in the middle of the side end of the stator disc, the rotor sleeve is arranged on one side of the rotor, the first damping ring is arranged on the outer wall of the rotor, the dynamic monitoring device is arranged at one end of the bearing body, the electromagnet is arranged on one side of the stator disc, the first stator is arranged on the other side of the stator disc, the limiting groove is formed in the side end face of the first stator, and the relative gap is reserved between the oil storage layer and the rotor all the time. Therefore, normal running of the rotor is not affected, and use needs of wide customers can be met.

The invention discloses a pantograph head. The pantograph head comprises a supporting structure, a roller structure, a connecting structure and a transverse alignment spring, wherein the roller structure can be in contact with a contact line to achieve the breakover with the contact line and can roll around the axial direction of the contact line; the connecting structure is connected with the roller structure and the supporting structure and enable the roller structure to move on the supporting structure around the radial direction of the contact line; and the transverse alignment spring is arranged on the supporting structure and can apply elastic force to the roller structure, so that the roller structure moves on the radial direction of the contact line and is aligned with the contactline again. According to the pantograph head, the sliding friction of a sliding plate and contact line of the pantograph head is avoided both laterally and longitudinally, the current receiving effectamong bow nets is significantly improved, the maintenance and the repair are simultaneously convenient, the maintenance cost is reduced, and the alignment between the contact line and the pantographhead can be better achieved.