168results about How to "Simple engineering" patented technology

A variable-sized, self-inflating and self-deflating intragastric balloon device, includes a hiocompatible polymer membrane formed into a balloon having inner and outer surfaces preferably coated with a wax, the balloon defining an interior lumen having an internal capsule freely floating within the lumen, the internal capsule having first and second chambers with a communicating one way valve therebetween. The first chamber is formed from a biocompatible polymer preferably coated with wax forming a gas and liquid tight housing to store a liquid solution therein, and the second chamber is composed of material capable of self dissolving or degrading in the presence of the liquid solution. Application of external pressure will transfer liquid from the first chamber through the valve into the second chamber where it will degrade the chamber and react with a solid reagent disposed within the lumen external to the capsule, forming a gas which inflates the balloon. A manufactured weakness within the membrane wall reacts chemically and/or physically causing a deflation of the balloon.

The invention discloses an anti-icing composite coating and a manufacturing method thereof. The anti-icing composite coating comprises three layers, wherein an inner layer is an organic silicon modified epoxy resin layer, a middle layer is a polyelectrolyte salt layer and an outer layer is a fluorine-silicon modified acrylic ester layer. The anti-icing composite coating is coated on the surfaces of components, such as high-voltage cables, iron towers, communication lines, aircrafts and the like, the adhesive force between the inner layer and a substrate can be increased due to the inner layer, icing can be slowed down due to ions ionized by the middle layer, and the adhesive force of ice on the surface and the icing quantity of the surface can be reduced due to the super hydrophobicity of the outer layer. The anti-icing composite coating has excellent bonding force on the substrate and higher heat conductivity, the surface of the outer layer has low surface tension, high hydrophobicity and high icing resistance, and the adhesive force of water and ice can be reduced to the maximum, thus the water and the ice can be easily removed; meanwhile, the middle layer can ionize ions to delay the adhesion of the ice under severe environment, thus the purposes of icing prevention and ice removal are realized. The manufacturing method disclosed by the invention has the advantages of easiness, feasibility, convenience for control, lower cost, and excellent use effect during engineering.

The invention relates to a system and a method, which facilities the establishment of a documentation of working processes, said documentation using methods of augmented reality, particularly in the domain of production, installation, service or maintenance. The system contains at least one camera for recording image information during one or more working processes, tracking means for determining the position and orientation of the camera with regard to points in space, and contains a mobile computer for processing the image information recorded by the camera as well as the position and orientation of the camera, and for relaying the processed image information as image data as well as the position and orientation of the camera as tracking information to a remote computer system. This remote computer system comprises: processing means for generating information, which supplements the image data, in the form of graphic elements, texts and/or for referring to additional information and for assigning the supplemented information to points in space; first playback means for playing back the image data and the supplemented information, and; storage means for storing the information that supplements the image data and for assigning this information to points in space and to the tracking information serving as documentation of the working processes.

The invention discloses a low-voltage ride-through control method for a grid-connected inverter based on control mode switching. The method comprises the following steps: during normal operation of the grid, a grid-connected inverter adopts a VSG control mode, the d-axis and q-axis positive and negative sequence components of the grid voltage are acquired and the phase angle of three-phase modulated wave is output in a PR current control mode, and the phase angle is used to follow the grid-connected inverter in order to output a voltage phase angle; when the grid fails, the given values of the d-axis and q-axis positive and negative sequence components of the current are calculated, the given value of current under a static coordinate system is obtained through inverse rotation transformation, a PR current controller generates a voltage signal, and the grid-connected inverter is quickly switched from the VSG control mode to a PR current control mode; and at the end of failure, the grid-connected inverter is switched back to the VSG control mode from the PR current control mode at an appropriate time. A grid-connected inverter can be smoothly switched between control modes. The grid-connection impact current can be limited, and reactive power can be provided for the grid. Thus, low-voltage ride-through of a virtual synchronous generator under grid failure is realized.

The invention relates to an adaptive clutter suppression moving-target signal processing method, which is mainly applicable to moving-target signal detection in a clutter environment in the field of radar detection. The adaptive clutter suppression moving-target signal processing method comprises processing flows as follows: firstly, dynamically matching pulse-pressed signals; carrying out primary compensation processing on the signals and sending the processed signals into narrow-band filter sets; respectively carrying out distance unit constant false-alarm processing on the signals output by each filter set, and obtaining a detecting result by selecting large output; and calculating an FIR (Finite Impulse Response) coefficient which uses a speed center as a main peak of a filter by using a given movement speed of a target which is focused on, and changing the coefficient of the filter in a adaptive manner. With the adoption of the method disclosed by the invention, the clutter is restrained obviously, the signal to noise ratio of the movement target is improved through the adaptive method, so that the signal detection performance is finally improved. Furthermore, application of VHDL (VHSIC Hardware Description Language) in FPGA (Field Programmable Gate Array) is completely realized. The method disclosed by the invention has wide application prospect in fields such as the radar detection.

The invention relates to a method and a device for finding hot videos based on user query logs in real time. The method comprises the steps of: firstly, carrying out word segmentation on user video query logs in a certain period of time to obtain atomic words; then, counting the occurrence number of each atomic word in the user video query logs in the certain period of time and the occurrence number of any two atomic words presenting in the same user query simultaneously; calculating the association degree of any two atomic words in the user video query logs by adopting a pointwise mutual information (PMI) method according to the obtained values of the occurrence number, merging any two atomic words with the association degree exceeding a certain threshold value into a compound word and placing the compound word into a compound word list; and finally, sorting the compound words in a descending manner, wherein the compound words ranking in the front are taken as keywords for finding the hot videos in real time according to a certain proportion finally.

The invention relates to the field of acoustic and signal processing, and mainly discloses a Doppler measurement and correction method for MFSK underwater acoustic communication. At a transmitting end, a frequency point falls on a sideband of an encoded signal by mapping two Doppler measurement spectrum lines; a receiving end can obtain a Doppler measurement value with higher resolution by performing Zoom-FFT processing on a compound fundamental frequency signal of the encoded signal; and finally the measurement value is used for performing Doppler correction and the compensation of time synchronization on the compound fundamental frequency signal. A DSP realizes the setting of two-stage ping-pong buffers which store a radiofrequency signal acquired by an AD and a compound fundamental frequency signal of a digital down converter respectively, improve the real-time and reduce the storage capacity. The method has the advantages that: the method overcomes the disadvantages of measuring Doppler by a single-frequency signal in the prior art; the measurement value can be reflected as a true value for each encoded signal; the measurement spectrum lines can be mapped at a frequency band of response difference and do not occupy an actual communication frequency band; and Zoom-FFT technology can improve the resolution of Doppler measurement, has small operation amount, also occupies less storage resources, and is easy to realize the engineering.

The invention belongs to the field of electrical power systems, and particularly relates to a pulse width modulation method for a modularization multi-level converter. The modularization multi-level converter (MMC) is composed of three phases and six bridge arms, each bridge arm comprises n sub-modules and an alternating current reactor, and the n sub-modules are successively connected in series. Each sub-module comprises two insulated gate bipolar translator (IGBT), a half-bridge structure and a capacitor, anti-parallel diodes of the IGBT constitute the half-bridge structure, and the half-bridge structure is connected with the capacitor in parallel. The pulse width modulation method includes the following steps: A three-phase saddle-shaped modulating waves are produced; B the saddle-shaped modulating waves and triangle carrier waves are compared to produce pulse-width modulation (PWM) signals; and C the PWM signals are used for controlling the MMC. The method has the advantages of achieving on-line computation easily, achieving engineering simply, being high in direct voltage use ratio, being capable of reducing the quantity of modules in the same voltage power level, and capable of lowering cost, and being obvious in effect when volume is large.

The invention relates to a control method and device for eliminating system buffeting during sliding mode control of a linear motor. In the method, a sign function in the conventional sliding mode control formula is replaced by a diffusion hysteresis function, so that control voltage on a mover coil is evaluated. Due to the soft switching property of the diffusion hysteresis function, buffeting during sliding mode control is eliminated. Parameters in a formula are obtained by second-order approximation and an experiment. The device comprises a linear motor, a displacement sensor, a signal processor, a driving circuit and the like, wherein a control signal of the signal processor is connected to the driving circuit; the signal processor comprises a central processing unit, an A/D (Analog to Digital) circuit, a D/A (Digital to Analog) circuit, an ROM (Read Only Memory) module, an RAM (Random Access Memory) module, a pulse width modulation module and a signal receiving circuit, and is used for storing a formula and parameters of a sliding mode control method; and the central processing unit is used for obtaining a voltage signal of the mover coil according to the mover displacement data of the displacement sensor and regulating the voltage of the mover coil through the pulse width modulation module so as to realize stable linear movement of the mover. By adopting the method and the device, system buffeting is eliminated effectively, and the running reliability is enhanced; and the method and the device are easy to realize.

According to the user switching method in satellite communication, a to-be-switched area relative to a user terminal is set for the edge of a coverage area of each satellite through a ground network management center; and then satellite switching is performed on the user terminal in the to-be-switched area of the satellite, so that the user terminal is connected to other satellites which are within the visual range of the user terminal and are not in the range relative to the to-be-switched area of the user terminal. The method has the advantages that the flexible to-be-switched area is set inthe satellite coverage area, the satellite switching of the user terminal is realized by adopting the user terminal judgment scheme, the strategy is flexible and reliable, the engineering realizationis simple, and the problem of frequent ping-pong switching is well avoided while the user communication quality is ensured.

An improved sucker pin bushing for an injection mold is disclosed. In various preferred embodiments, the improved sucker pin bushing maintains much of the configuration of a conventional sucker pin bushing, namely a body portion and a head portion having a larger diameter than the body portion. A shoulder is formed where the body portion meets the head portion. However, the need for a jam screw or other retaining means is eliminated by the present invention by the inclusion of threads on the head portion of the bushing.

A wiper blade, especially for a windshield wiper, is proposed, which is provided at least from area to area with a friction-reducing coating formed by a lubricating varnish. The lubricating varnish contains a polyurethane, a siloxane and, as dry lubricant, graphite, polytetrafluoroethylene, polypropylene and/or molybdenum.

The invention belongs to the technical field of deep foundation pit construction, and discloses a steel pipe column insertion accurate positioning structure. The steel pipe column insertion accurate positioning structure comprises a steel pipe column, wherein a tool joint is connected to the outer side of the steel pipe column. The steel pipe column insertion accurate positioning structure furthercomprises a preset hole, a protective cylinder arranged in the preset hole and a positioning platform; one end of the protective cylinder is exposed out of the ground; the positioning platform is positioned above an opening of the preset hole and connected with the ground through threaded steel; the positioning platform is provided with a positioning pin used for limiting the steel pipe column; the steel pipe column is inserted into the protective cylinder; section steel is arranged on the two sides of the end, exposed out of the ground, of the protective cylinder; channel steel is perpendicularly arranged on the section steel; and the bottom end of the steel pipe column is fixed to the plane of the bottom of the hole through a fixing piece. According to the steel pipe column insertion accurate positioning structure, on the basis that the input cost is saved, the perpendicularity and the center position of the steel pipe column can be directly measured in the whole construction process, correction is conducted in time after the cost is reduced, and the uncontrollability of error accumulation and untight contact between the steel pipe column and a positioner in a traditional technology is avoided. The invention further discloses a construction method for conducting accurate positioning through the structure.

The invention discloses an electronic device, a camera and an optical image stable driving device. The device comprises an outer shell, a carrier and at least three electric transformation components, wherein at least part of the carrier is arranged in the outer shell, the carrier is in the suspension state relative to the outer shell and a base, one end of the carrier is directly or indirectly connected with one or one set of first elastic elements which provide restoring force for the carrier, the other end of the carrier is directly or indirectly connected with at least three or three sets of second elastic elements, each or each set of second elastic elements are respectively connected with the electric transformation components respectively, the electric transformation components are directly or indirectly connected with signal terminals, the electric transformation components are arranged on the periphery of the carrier, and therefore the low power dissipation of the optical image stable driving device is achieved by shortening the one-way motion displacement, the product manufacturing engineering complexity is greatly reduced, and the electronic product stability is greatly improved.

The invention aims to provide a TRM (time reversal mirror) technology based underwater positioning method, which mainly comprises the following steps: determining the coordinate position of each array element of a short baseline relative to a geodetic coordinate system, emitting a broadband linear FM (frequency modulation) interrogating signal to the position of an underwater transponder, and determining a signal emission time; receiving the broadband linear FM (frequency modulation) interrogating signal s (t) by the underwater transponder, and estimating a multi-path spread delay length t byusing the s (t); selecting a time window according to the t, and carrying out time reversal processing on the received signals within the range of the time window; carrying out relative real-time detection on the signal (subjected to time reversal) received by an overwater short baseline processor through sliding, and according to the obtained detection result, judging whether a correlation peak is over a preset threshold scope, if so, judging that an answer signal is arrived, and at this moment, determining a signal receiving moment; and calculating the delay inequality of four circuits of signals of a short baseline array so as to obtain a distance, then obtaining a target position through converged calculation. By using the method provided by the invention, the high precision and low noise requirements of a system can be satisfied, and the multi-path influence of an underwater channel cam be offset effectively.

The invention discloses a permanent magnet synchronous motor torque compensation method and a permanent magnet synchronous motor compensation device. The method comprises the following steps of acquiring a permanent magnet synchronous motor line voltage uVU and a line voltage uWU; according to the line voltage uVU and the line voltage uWU, calculating a permanent-magnet synchronous-motor three-phase counter electromotive force; acquiring a rotation speed of the permanent magnet synchronous motor, and according to the calculated permanent-magnet synchronous-motor three-phase counter electromotive force and the acquired rotation speed, determining a d-shaft flux linkage psid and a q-shaft flux linkage psiq of the permanent magnet synchronous motor; according to the determined d-shaft flux linkage psid and the q-shaft flux linkage psiq, extracting corresponding harmonic wave compensation values delta ud and delta uq; and according to the extracted harmonic wave compensation values delta ud and delta uq, carrying out harmonic wave compensation on a permanent magnet synchronous motor control system so as to reduce a speed fluctuation. In the prior art, in a process that an air-gap magnetic field restraining the permanent magnet synchronous motor is with different degrees of harmonic waves, a scheme is complex. By using the method and the device of the invention, the above problem is solved and complexity of permanent magnet synchronous motor compensation control is reduced.

The embodiment of the invention discloses a data collection method and device, and is applied to the technical field of the wireless sensing network. The method comprises the following steps: obtaining multiple pieces of compressed collection data, wherein the multiple pieces of compressed collection data are obtained in a way that a plurality of sensor nodes independently use different random measurement matrixes to carry out independent linear compression on the collected collection data; carrying out simultaneous low-rank and joint sparse modeling on the multiple pieces of compressed collection data to obtain a compression sensing reconstruction model based on a simultaneous low-rank and joint sparse structure; according to the compression sensing reconstruction model, adopting a joint reconstruction algorithm to reconstruct the multiple pieces of compressed collection data to obtain the collection data collected by the plurality of sensor nodes. Compared with the traditional data collection method, the data collection method disclosed by the invention is characterized in that the compression ratio and the reconstruction performance of the data can be effectively improved while engineering implementation is guaranteed to be simple, and network energy consumption is reduced.

The invention relates to a separating device for separating fluids (18) from solids (31), in particular for the separation of fluids (18) from material previously isolated from a solid-fluid mixture (33), comprising:-a screw transport device (1), provided with a housing (2), a shaft (4) and a conveying helix (3), a compacting zone (15) wherein the solid conveyed by the screw transport device (1) is compressed to express the fluid, a sieve area (16), in particular on the compacting zone (15) and a solids discharge section (7) where the expressed solids are led away from the rotating axis of the screw transport device (1). According to the invention, the drainage effect may be improved, whereby a counter transport device (9) is provided for the transport of solids in a direction (10), opposed to at least one direction component of the transport device (8) on the screw transport (1), in such a way that solids in the compacting zone (15) and/or in the solids discharge section (7) are put under pressure by the counter transporting (10), in order to increase the expression force for the expression of fluids and the discharge force (P) for the discharge of expressed solids from the separating device. According to the invention, the drainage effect may be alternatively, or additionally improved, whereby the sieve surface (16) is formed at least partly on the shaft (4). Further, a preferred application of the above separating device in a mechanical effluent treatment is disclosed.

The invention relates to the field of ship navigation, in particular to a construction method for an artificial island platform. The construction method at least comprises the following steps that an artificial island platform with supporting pile legs is built; the artificial island platform is towed to a specific sea area; and the supporting pile legs are sunk and supported on the seabed sludge surface of the specific sea area, and the artificial island platform finishes positioning and fixation through the supporting pile legs. The construction method for the artificial island platform has the advantages that a reef island base can be built on continent, a project which is complicated and difficult to operate is simplified, and the construction is facilitated; the construction method can realize the batch production of artificial island platforms and provide safeguard for the navigation supply and safety in ocean vessel navigation; the cost is greatly reduced; and the artificial island platform can be moved through towing wheels, is strong in flexibility and can be repeatedly used.