77results about How to "Improve build accuracy" patented technology

The invention discloses a testing tool system for LNG ship liquid cargo compartment three-dimensional board CM nodes. The testing tool system comprises an inner clamping template and an outer clamping template. The inner clamping template is used for aligning the LNG ship liquid cargo compartment three-dimensional board CM node. The outer clamping template is used for verifying in a CM node verification stage after welding of the LNG ship liquid cargo compartment three-dimensional board CM node. The three-dimensional board comprises a transverse board, a vertical board and an oblique board. An included angle between the transverse board and the oblique board is alpha. A first reference line which is perpendicular with the transverse board is engraved on the transverse board. A second reference line which is perpendicular with the vertical board is engraved on the vertical board. According to the testing tool system, testing templates which matches the three-dimensional board are utilized. The testing templates comprise the inner clamping template for quick assembling and loading, thereby ensuring high precision and high stability in assembly. The testing templates further comprise the outer clamping template for after-welding verification. For ensuring high accuracy in final state measurement, the specialized outer clamping template is utilized, thereby truly testing the final deviation of each node.

The invention belongs to the technical field of data converters in integrated circuit design, and discloses a double-input operational amplifier shared margin gain amplifying circuit. The amplifying circuit comprises a double-input operational amplifier, a clock generating circuit, a sub digital-to-analog converter, a sub analog-to-digital converter, a capacitor, a switch and the like. Two groups of differential input pair tubes are controlled through the switch controlled by bidirectional overlapped clocks and embedded inside the operational amplifier by adopting the operational amplifier of two groups of input differential pairs and are alternately used at two phases of the clocks, and meanwhile the input differential pairs are alternately reset to a common-mode input voltage so as to fully eliminate the influence of memory effect and inter-stage feed-through in the traditional circuit, improve the signal establishing precision under the condition of keeping the same area, power consumption and circuit complexity and further improve the precision of analog-to-digital conversion.

The invention discloses a method, apparatus, device of measuring the distance between base stations, and a positioning system based on the distance measuring method. The method of measuring the distance between base stations includes the steps: utilizing a synchronization signal to trigger a first timing module to start timing and trigger a distance measuring signal emission module to emit a distance measuring signal; utilizing the synchronization signal to trigger a second timing module to start timing; utilizing the distance measuring signal to trigger the first timing module and the second timing module to stop timing; and by means of the interval from the time when the first timing module is triggered by the synchronization signal to start timing to the time when the first timing module is triggered by the distance measuring signal to stop timing, and the interval from the time when the second timing module is triggered to start timing by the synchronization signal to the time when the second timing module is triggered to stop timing by the distance measuring signal, obtaining the distance between the first base station and the second base station. The invention also discloses a method of establishing a coordinate system between base stations in a positioning system. According to the technical scheme of the method of establishing a coordinate system between base stations in a positioning system, the cost of manpower and material resources for measurement can be saved and the positioning accuracy can be improved.

The invention discloses lift roller based hull block turning equipment during ship construction. The turning equipment comprises a rotary table (11). Two sides of the rotary table (11) are fixed on rotary rings (21) used for overturning respectively. The rotary table (11) comprises an electromagnet adsorption component and a plane attached to a hull block. Each rotary ring (21) rotates together with an outer side driving gear (33). Grooves are formed in the plane, attracted to the hull block, of the rotary table (11) at intervals. Lift roller components (12) are arranged in the grooves. Each lift roller component (12) comprises a track (123) perpendicular to the plane of the rotary table (11). Roller carriers (124) with rollers (121) are arranged in the tracks (123). Lift roller hydraulic oil cylinder components (122) are connected to the lower sides of the roller carriers (124). Rotary shafts of the rollers (121) are connected with roller driving motor components. By the turning equipment, construction cost of the hull block is greatly reduced, and construction efficiency is improved.

The invention discloses a guide pipe frame, a guide pipe frame foundation platform and a guide pipe frame construction method. The guide pipe frame comprises at least two main guide pipes and at least two secondary guide pipes, wherein the main guide pipes and the secondary guide pipes are staggered to surround by a lap; the main guide pipes and the secondary guide pipes, close to each other, are connected through middle support rods; multiple inclined support rods are additionally arranged between the main guide pipes and the secondary guide pipes close to each other; and with connecting points of the middle support rods and the main guide pipes as first nodes, the multiple inclined support rods are connected between the main guide pipes and the secondary guide pipes in a sector form with the first nodes as centers. The guide pipe frame, the main guide pipes and the inclined support rods between two secondary guide pipes near the main guide pipes are gathered on the first nodes to facilitate to transfer the load onto the main guide pipes, so that the stability and the fatigue resistance of the guide pipe frame are improved; and as the support rods are not connected in the whole guide pipe frame, and the guide pipes are only connected with the support rods, the numbers of the support rods and the nodes are decreased, the construction is more convenient, the materials are saved, and the construction cost is reduced.

A building process for a deep sea spar platform includes the steps: firstly, respectively building an upper hard tank ring half section and a lower hard tank ring half section on a slide way; secondly, mounting lifting devices on the periphery of the upper ring half section; thirdly, continuously lifting the upper hard tank ring half section to a set position; fourthly, folding and butting the lower hard tank ring half section and the upper hard tank ring half section into an integral ring section; fifthly, leading the integral ring section to slide out of a mounting device; sixthly, repeating the step two to the step five until a plurality of integral ring sections are built; seventhly, folding and connecting the integral ring sections into an integral hard tank; eighthly, respectively mounting a truss and a soft tank on slide shoes positioned on sliders; and ninthly, completing building of a spar platform body by means of butting and folding. By the aid of the building process, building precision of the platform is improved, construction period is shortened, a building procedure is little susceptible to environment (wind) load effect, a requirement on site space is lowered, and important technical support is provided for deep-sea resource development.

The invention relates to a latch circuit. The latch circuit comprises a preamplifier, a comparison latch body, a first pair of reset tubes, a second pair of reset tubes, and a pair of switch tubes, wherein the preamplifier amplifies an input differential signal, the comparison latch body is connected with the preamplifier and performs compared latch on the amplified differential signal, the firstpair of reset tubes are connected with an output of the comparison latch body and a power supply, the second pair of reset tubes are connected with a drain of an input pair tube of the preamplifier and a power supply, the drain of the input pair tube of the preamplifier is grounded through the pair of switch tubes, gates of the two pairs of reset tubes receive a clock signal, a gate of the pair ofswitch tubes receives a delayed clock signal of the clock signal, the two pairs of reset tubes are used for enabling the comparison latch body to work in a linear area when the clock signal changes from low to high, and the pair of switch tubes helps reduce one tube for the ground path of the comparison latch body in work. The impact of circuit mismatch on comparison accuracy is lowered, the working time of a comparator is reduced, and the bit error rate in design of an analog-to-digital converter caused by the latch comparator is lowered.

The invention relates to a construction process for a lifting leg pile of an offshore living platform. The construction process is characterized by comprising the following steps of joint pipe manufacturing, unit section butt joint, segment butt joint, T-shaped frame assembly and welding, external web plate assembly and welding, pile leg cylinder curved surface hole making and sealing, sand blasting coating and pile insertion assembly. According to the construction process, each pile leg segment is of a cylinder structure, a plurality of cylinder segments are spliced and assembled into a segment, the construction efficiency is improved, and the construction cost is reduced; vertical reinforcing ribs and T-shaped reinforcing rings play the roles of longitudinal and transverse fixing and reinforcing, structural pipes play the role of transverse reinforcing in cylinders, and the strength of a pile leg structure is ensured; and the construction accuracy of a rack plate is improved by restricting the main indexes such as straightness, tooth spacing and common normal spacing of the rack plate, so that the support and stability of the pile leg are improved, and welding deformation or weldcracking is avoided.

The invention discloses hull block turning equipment provided with clamping and protecting mechanisms during ship construction. The hull block turning equipment comprises a rotary table (11). Two sides of the rotary table (11) are fixed on rotary rings (21) used for overturning respectively. The rotary table (11) comprises an electromagnet adsorption component and a plane attached to a hull block. Each rotary ring (21) rotates together with an outer side driving gear (33). Wide slots are formed at the edge, contacting with the hull block, of the rotary table (11). Movable clamping components are arranged in the wide slots. Each movable clamping component comprises a track frame component which is perpendicular to the plane of the rotary platform and moves outwards parallelly to the plane of the rotary platform. Clamping claws are arranged in the track frame components. Each clamping claw is provided with a hydraulic component for moving the claws in two directions. By the hull block turning equipment, construction cost is greatly reduced, and construction efficiency is improved.

The invention discloses a building process of an upper assembly of a maritime booster station. The building process comprises the following steps that (1) all layers of deck pieces are prefabricated and hoisted; (2) preparation is conducted before the deck pieces are hoisted; (3) the bottom deck pieces and related devices are hoisted; (4) the second layer of deck pieces and related devices are hoisted; (5) the third layer of deck pieces and related devices are hoisted; (6) the fourth layer of deck pieces are hoisted; and (7) the fifth layer of deck pieces are hoisted. When the upper assembly is built, all layers of deck pieces and segments of a steel structure building are hoisted from bottom to top and from inside to outside, land construction of the upper assembly adopts the method of segment prefabrication and integral hoisting, the land prefabrication depth is increased as much as possible, and the aerial working amount is reduced; and meanwhile, the related devices on the deck pieces are installed in place after the deck pieces are hoisted, the maritime tooling quantity is reduced, trouble caused by transportation is also omitted, the steps of the whole building process of the upper assembly are orderly, and the building efficiency and precision are greatly improved.

The invention, which belongs to the technical field of ship construction, discloses a method for installing a liquid cargo pump base of a duplex stainless steel chemical tank. The method comprises thefollowing steps: step one, making a deck opening positioning mechanism including a first opening template and a second opening template that are circular-ring-shaped plate structures with the thicknesses of 6mm; step two, determining the center of a deck opening on the deck; step three, placing the deck opening positioning mechanism on the deck; step four, carrying out opening on the deck by using a cutting machine; step five, installing a liquid cargo pump base, hoisting the liquid cargo pump base at the deck opening, enabling indication laser of a laser plumb aligner to pass through the central point of a liquid cargo cabin bottom suction well; step six, locating and welding the deck and the liquid cargo pump base; and step seven, welding and fixing the deck and the liquid cargo pump base. With the method disclosed by the invention, a problem that the liquid cargo pump base cannot be located, welded and fixed accurately is solved.

The invention discloses a sealing plate device of a half ship floating end surface and belongs to the technical field of ship assembling. The sealing plate device of the half ship floating end surface comprises a sealing plate and multiple first tensioning components, wherein the sealing plate is used for sealing a closure opening of a half ship end surface; multiple first pullers are arranged on the sealing plate; one end of each first tensioning component is connected with a hull; the other end of each first tensioning component is connected with a first puller; and the lengths of the first tensioning components are adjustable. According to the sealing plate device of the half ship floating end surface, the sealing plate and the hull approach each other or are separated from each other through the first tensioning components; and therefore, the sealing plate device to be detached can avoid cutting treatment in the closure opening of the half ship end surface while the sealing condition of a hull cabin is satisfied, the treatment time of the closure opening of the half ship end surface is shortened, and the operation time is shortened; and meanwhile, the labor intensity of operation personnel is reduced.

The invention discloses an assembling type structure of a symmetric wing type net cage floating tube frame and a construction method. The assembling type structure is composed of a wingtip component (1), a wing tail component (2) and two wing side components (3), wherein the wingtip component (1) is provided with an arc metal tube (11) and two metal flanges (12); the wing tail component (2) is provided with a V-shaped tube (21) and two connecting flanges (22) made of the same material as the V-shaped tube (21); each wing side component (3) is provided with an HDPE straight tube (31) and two HDPE flanges (32). According to the assembling type structure, the high-precision symmetric wing type outer contour can be constructed, the structure conforms to the single point mooring using characteristic of the symmetric wing type net cage floating tube frame, and the assembling type structure has the advantage of being low in building cost; the construction method has the advantages of being high in construction precision and high in speed.

The invention provides a helmet based on tactical command. The helmet comprises a helmet main body, a mounting base, a support assembly, a driving unit and a radar. The helmet body is detachably arranged on the head of a user in a sleeving mode, the mounting base is arranged on the front end face and/or the top and/or the side face of the surface of the helmet body, and the support assembly is fixedly mounted on the mounting base of the helmet body. The radar is fixedly connected with the end part of the support assembly. A transmission shaft of the driving unit is connected with the radar andfixedly installed on one side of the radar. Through the radar capable of being installed at multiple positions, multi-directional position detection can be achieved, a user does not need to hold theradar by hand for operation, and great convenience is achieved. Meanwhile, the invention further provides a map drawing and positioning system used on the helmet, information of the control unit, theradar and the remote client can be transmitted under wireless connection, the positioning accuracy of combat personnel in a complex environment and the map construction accuracy of a battlefield environment are improved, and potential safety hazards in the battlefield environment are reduced.

The invention discloses a digital background self-calibration circuit structure and method for a single-channel high-speed high-precision SAR ADC, and the structure comprises a bootstrap switch module, a capacitor array module, a comparator module, a register module, an SAR logic control module, and a digital calibration module. The bootstrap switch module is used for controlling the transmissionof an input signal; the capacitor array module is used for obtaining an error voltage and obtaining a sampling signal; the comparator module is used for comparing the voltages of the sampling signalsat different ends; the register module is used for storing the actual weight of the capacitor array module; the SAR logic control module is used for controlling a capacitor at the switch end of the capacitor array module to perform switch switching; and the digital calibration module is used for performing mathematical operation on an output result of the comparator module to obtain an error weight and an actual weight of the capacitor array module. According to the calibration method, the weight value of the high-weight-bit capacitor is effectively calibrated, and the establishment precisionof the high-weight-bit capacitor is improved, so that the data conversion rate is improved.

The solution, the improving the stability in the mounting, and the possibility of the reduction in weight it grows serious with volume may be referred to the difficult that the in-phase problem happens. Base foundation obtaining and realizes the improvement and cost reduction of handling It is the base foundation in which there is little the concern in which the break down by the moisture freeze occurs. The completed structure water using the base foundation provides. In the base foundation, it does not interfere about the height direction with the angle and it extends as the other direction and one end is opened around the central part of the one-way of the height direction and the through-hole more than opened of the other end is prepared with another side of the height direction. The base foundation puts the respective inserted pile into the through-hole into the underground and it is installed at the land. The base foundation comprises the main body, formed in the inner portion into the bowl form overturned to form the internal space opened to another side of the height direction and the multiple partition members which is formed with the pipe shape and is prepared by the hole of the inner portion in the peripheral part of the main body to form the through-hole through the main body.

The invention discloses a DNP3 testing case generation method, a system, a device and a computer medium, which are applied in the DNP3 protocol. The method comprises the following steps: obtaining application layer data, wherein the application layer data is data encapsulated by a data object to be mutated according to the application layer specification of the DNP3 protocol;locating the data objects to be mutated in the application layer data; determining a field to be mutated in the data object to be mutated; the mutation is performed on the mutated fields to obtain mutated application layerdata; according to the transport layer specification of DNP3 protocol, the application layer data is encapsulated into transport layer data. The transport layer data is encapsulated into the data link layer data according to the data link layer specification of the DNP3 protocol. The invention discloses a DNP3 test case generation method, a system, a device and a computer-readable storage medium,which ensure that the data of a data link layer must conform to the DNP3 protocol and contain fields to be mutated, and improves the generation accuracy of the DNP3 test case generation method.

The invention discloses an industrial robot D-H parameter three-dimensional self-calibration correction device and method, relates to the field of robot correction, and aims to solve the problems in the prior art. The device comprises a three-dimensional calibrator, a data transmission cable, a zero-position rapid positioning clamp, a four-ball calibration table, a three-dimensional angle adjuster and a control computer. The three-dimensional calibrator is composed of three high-precision grating displacement sensors which are perpendicular to one another, and each high-precision grating displacement sensor is connected with the control computer through the data transmission cable. The three-dimensional calibrator is mounted at the tail end of a calibrated industrial robot, measures four standard balls on the four-ball calibration table, and performs high-precision positioning on a TCP point of the robot through the standard balls. The zero-position rapid positioning clamp is used for calibrating the three-dimensional calibrator. The three-dimensional angle adjuster is arranged below the four-ball calibration table. According to the device, the acquisition cost of the whole device can be greatly reduced while the calibration precision is ensured, the use mode is quick, simple and convenient, and the device can be widely popularized in various use units.

The invention discloses a data query method, system and device and a computer readable storage medium. The method comprises the steps of determining a target function and a target lookup table interval corresponding to a target lookup table; segmenting the target table lookup interval to obtain each segmented interval and a corresponding segmented interval point; determining an original first-order linear fitting function corresponding to the target function in each segment interval; determining metadata corresponding to each segment interval point based on the original first-order linear fitting function, and constructing a target lookup table based on the segment interval points and the metadata; obtaining a query request, wherein the query request at least comprises target data; determining a target interval point corresponding to the target data from each segmented interval point recorded in the target lookup table based on the target data; and determining a target query result of the target data based on the target interval point and the corresponding metadata. The metadata recorded in the target lookup table can be closer to the value of the segmentation interval point in the target function, and the data query accuracy is ensured.

The embodiment of the invention discloses an industrial fault knowledge graph establishment method for an end-to-end scene, relates to the field of fault automatic diagnosis based on artificial intelligence, and can establish an industrial fault knowledge graph which is high in quality and large enough to support a follow-up operation reasoning algorithm in a short time. The method comprises the steps that a description text of the industrial equipment fault process is collected and input into a UT-CRF entity naming recognition model, and after an entity naming recognition task is executed, the UT-CRF entity naming recognition model outputs an entity extraction result; extracting a training set from the entity extraction result and training an RCNN entity classification model; the entity extraction result is input into a trained RCNN entity classification model, an entity classification task is executed, and the RCNN entity classification model outputs entity text data with entity category labels; and constructing an industrial fault knowledge graph by using the entity text data with the entity category labels.