Patents
Literature
Patsnap Copilot is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Patsnap Copilot

134results about How to "Uniform change" patented technology

Control method of opening of large flow throttle valve for water

The invention provides a control method of the opening of a large flow throttle valve for water. The control method is characterized in that the position of a piston rod in a proportional servo oil cylinder is controlled by regulating input current of a pilot electro-hydraulic proportional flow valve, and the piston rod drives a valve core of the large flow throttle valve for water to move, thus ultimately controlling the opening of the large flow throttle valve for water; the piston rod is fixedly connected with the valve core of the throttle valve for water by screw threads; an unsymmetrical closed loop PID control method is employed in the control process, input is a given opening value of the large flow throttle valve for water, feedback is the actually detected opening value of the large flow throttle valve for water, the difference e (t) between the given opening value of the large flow throttle valve for water and the actually detected opening value of the large flow throttle valve for water is input into a PID controller, and the PID controller outputs current signals to the pilot electro-hydraulic proportional flow valve. The method has the advantages of high control precision, convenient installation and operation, strong practicability and high reliability.
Owner:CENT SOUTH UNIV

Method for measuring external parasitic resistance of MOS transistor

A method for measuring the external parasitic resistance of an MOS transistor comprises the steps that a semiconductor substrate is provided, and the MOS transistor is formed on the semiconductor substrate; a first voltage is applied to the gate electrode of the MOS transistor, a second voltage is applied to the source electrode of the MOS transistor, the first voltage is increased gradually, the second voltage remains unchanged, and at least ten source leakage current values corresponding to different first voltage values are obtained through measurement; according to the second voltage and the source leakage current values, at least ten MOS transistor source leakage resistance values corresponding to the different first voltage values are obtained through calculation, wherein the MOS transistor source leakage resistance comprises channel region resistance and the external parasitic resistance; curve fitting is conducted on the different first voltage values and the corresponding MOS transistor source leakage resistance values for five times, so that the external parasitic resistance of the MOS transistor is obtained. According to the method for measuring the external parasitic resistance of the MOS transistor, the measuring process is simple and convenient.
Owner:SEMICON MFG INT (SHANGHAI) CORP

Free view-point image quality evaluation method based on light space

InactiveCN101478694AUniform changeThe resulting variation characteristics are close toTelevision systemsLow noiseViewpoints
The present invention relates to a free viewpoint image quality evaluation method based on ray space. The invention uses the edge pixel direction consistency parameter of lines which have same direction in ray space for elevating the ray space quality obtained by three different interpolation methods. Firstly the high-frequency energy diagrams of all pixel direction angles in the ray space are obtained from three interpolation methods. Simultaneously the edge graph of ray space, which has low noise and same direction, is obtained. Then the average high frequency energy value of pixel direction angle in the edge graph is calculated, and the value is used as an important criterion which is used for evaluating the consistency of ray space edge pixel direction obtained through interpolation. Finally whether the evaluated high-quality ray space can generate high-quality viewpoint picture is checked. The test shows that when the ray space obtained through fixed-direction interpolation, ray space obtained through bilinear interpolation and ray space obtained through most adjacent interpolation are executed with quality evaluation, the obtained parameter variation is more uniform and is more adjacent with the variation characteristic of PSNR evaluation result compared with the prior art.
Owner:SHANGHAI UNIV

Open-type heavy hydraulic motor

The invention discloses an open-type heavy hydraulic motor which comprises a bracket, a spin valve and a crank shaft arranged at the center of the bracket, wherein one end of the crank shaft is connected with the outer end part of a valve core; more than four uniformly distributed double-acting oil cylinders are arranged around the eccentric section of the crank shaft; the bottom of each double-acting oil cylinder is hinged with the bracket, and the piston rod of each double-acting oil cylinder is connected with the eccentric section of the crank shaft through a rotatable connection structure; a valve body is provided with an oil inlet, an oil outlet and working oil ports of which the number is corresponding to that of the oil cylinders; all the working oil ports are uniformly distributed on the circumference of the valve body; the circumference of the valve core is provided with two annular grooves and two sectorial oil grooves; the corresponding central angles of the two sectorial oil grooves are greater than 90 degrees and less than 180 degrees; the two sectorial oil grooves are respectively connected with the corresponding annular grooves through connecting oil ways; and each working oil port is connected with the rod cavity oil port and rodless cavity oil port of each double-acting oil cylinder according to the corresponding relations. According to the invention, an extra-large torque can be easily realized, and the output torque and rotation speed are more uniform; and the open-type heavy hydraulic motor is convenient to install and maintain and has a wider application range.
Owner:南通艾德森机电设备有限公司

Raster-vector geographic data reversible decryption method based on trigonometric function

The invention provides a raster-vector geographic data reversible decryption method based on a trigonometric function. The method comprises the steps of building a trigonometric function model, calculating trigonometric function model parameters and building a decryption model according to original raster-vector geographic data, adopting the decryption model for performing decryption on the raster-vector geographic data, building a recovery model according to decryption model parameters, and adopting the recovery model for recovering the decrypted raster-vector geographic data. On the premise that the vector data topological relation is maintained unchanged, the excellent function characteristics of the trigonometric function are sufficiently utilized, and a decryption error is controlled by adjusting the amplitude; by keeping the model periodicity, and it is ensured that decryption data changes uniformly and the topology is kept good; by maintaining that an arbitrary order is derivable, the decryption effect is smooth and advanced gradually; the model attack resistance is improved, it is ensured that the decrypted data has the high safety, and has the advantages of being reversible and efficient in decryption, and technical supports can be provided for security, secrecy and sharing using of raster-vector geographic data.
Owner:NANJING NORMAL UNIVERSITY

Bladder-type storage tank for high concentration hydrogen peroxide

The invention discloses a bladder-type storage tank for high concentration hydrogen peroxide, which comprises a storage tank shell body, an injection discharging component and a thin film liquid bag, wherein the injection discharging component is coaxially mounted inside the storage tank shell body; the injection discharging component is constituted of an end cover, a multi-hole pipe, a fixed disc and a support plate; the end cover and the fixed disc are respectively welded on two ends of the multi-hole pipe; the end cover is connected to a storage tank outlet flange; liquid inlet/ outlet channels are respectively opened on the end cover and the fixed disc; the multi-hope pipe is provided with dense small holes in order to make sure the flow area of a propellant; the fixed disc and a support disc are used for mounting the thin film liquid bag and fixing the injection discharging component; the support disc is designed with a diffusion hole in order to prevent the thin film liquid bag from being impacted directly by the pressurized gas; and the thin film liquid bag is uniform in applied force. The advantages are that the bladder-type storage tank is suitable for storing hydrogen peroxide propellant for a long time; the hydrogen peroxide propellant and the pressurized gas are separated by the thin film liquid bag; the pressurized gas is wide in choice; and the hydrogen peroxide won't be catalyzed and decomposed by the pressurized gas.
Owner:BEIHANG UNIV

Water resistor for load test in generator and generator load testing device

ActiveCN102495369AThe water level changes evenly and slowlyLoad regulation changes smoothlyDynamo-electric machine testingPipingReturn channel
The invention discloses a water resistor for a load test in a generator. A feed water pump is arranged on an inlet pipe of each operating water tank to pump the water of a storage water tank into the operating water tank, and a draining pump is arranged on a water outlet pipe of each operating water tank to pump the water in the operating water tank to a spraying pipe. A water receiving basin capable of collecting sprayed water is arranged below the spraying pipe. Water return channels are formed at the bottom of the water receiving basin to return the collected water into the storage water tank. The operating water tanks are correspondingly connected with the feed water pumps and the draining pumps, and water levels in the operating water tanks can be regulated by regulating the flows of the feed water pumps and the draining pumps to further regulate a load. The water levels are changed uniformly and slowly, so that the load can be regulated and changed stably, and a sudden change is avoided. In addition, the water drained by the operating water tanks is sprayed and cooled, and then returns to the storage water tank, heat produced by the power consumption of the generator in the load test in the circulation process of the water can be timely dissipated to the outside, and the water in the operating water tanks cannot be gasified in the test process, so that the stability of the load can be maintained.
Owner:GUANGZHOU SHIPYARD INTERNATIONAL LTD

Preparation method of heteromorphic microporous ceramic capillary

ActiveCN107324802AGuaranteed positionAppearance dimensionally stable and uniformMouldsCoupling light guidesMicrometerVolumetric Mass Density
The invention provides a preparation method of a heteromorphic microporous ceramic capillary. The preparation method comprises the steps of designing a special heteromorphic microporous ceramic capillary forming die, preparing special zirconia ceramic particles, matching a unique sintering forming technology to achieve primary sintering forming of a heteromorphic inner hole of the ceramic capillary without secondary processing, and designing a thimble positioning hole during forming green body preparation according to a product property of the heteromorphic microporous ceramic capillary to allow that an outside diameter grinding technology of the ceramic capillary is greatly simplified. For the ceramic capillary prepared by the method, the density reaches 6.0-6.10g/cm<3>; the hardness is greater than 1200HV; the bending strength is greater than 1200MPa; the dimensional tolerance of the inner hole is within 3 micrometers; the outside diameter grinding precision can reach 1-micrometer position precision; a glass capillary in a multi-core optical fiber collimator can be completely replaced; the matching precision with an optical fiber is high; the reliability meets a requirement of an optical passive device standard GR1209/1221.
Owner:黄石晨信光电股份有限公司

Novel whitewashing device for tree trunk in winter

The invention relates to a novel whitewashing device for a tree trunk in the winter. A mechanism track is arranged on a vertical supporting rod, and an upper supporting arm and a lower supporting arm are respectively arranged on the mechanism track, and are connected with a motor through belts respectively; the upper supporting arm and the lower supporting arm are irregularly hexagonal, and double-hinged sliding rod supports are arranged at four corners formed by intersecting of five sides of the upper supporting arm; double-hinged sliding rod supports are arranged at four corners formed by intersecting of five sides of the lower supporting arm; a double-hinged sliding rod is arranged on each double-hinged sliding rod support; each double-hinged sliding rod is connected with two connecting rods; the two adjacent connecting rods of each double-hinged sliding rod are X-shaped to form five X-shaped rotation pairs; a sprayer is arranged at the position of the center of each of the five X-shaped rotation pairs; the sprayers are adjacently connected with a high-pressure plunger pump through a pipe; and the pipe is curled up in an automatic pipe winding wheel. The novel whitewashing device for the tree trunk in the winter is simple in structure, reasonable in design and high in practicality; and the distance between the upper supporting arm and the lower supporting arm is adjusted to adjust the diameter of an inscribed cylinder of a regular pentagonal prism.
Owner:SHENYANG JIANZHU UNIVERSITY

System and method for testing and controlling mechanical properties of rocks under complicated condition

The invention belongs to the technical field of testing mechanical properties of rocks, and discloses a system and a method for testing and controlling the mechanical properties of the rocks under a complicated condition. The system for testing and controlling the mechanical properties of the rocks under the complicated condition comprises a hardness detecting module, a tension detecting module, apressure detecting module, a temperature-humidity detecting module, a main control module, a density measuring module, a rock phase analysis module, a data storage module and a display module. According to the system for testing and controlling the mechanical properties of the rocks under the complicated condition, disclosed by the invention, a rock sample can be constructed into a cylinder of which the volume can be conveniently obtained through the density measuring module, the axial size and the radial size of the rock sample can be changed by respectively applying pressure to the top surface, the bottom surface and the side surface of the rock sample, and the heated and pressurized rock sample still is the cylinder, so that the volume of the heated and pressurized rock sample can be obtained, and measurement of rock density can be convenient; meanwhile, fine laminating of a big, very thick and single shale layer section can be rapidly solved through the rock phase analysis module.
Owner:TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products