27results about How to "Prevent inversion" patented technology

The invention provides an asymmetric short-circuit current calculation method and system for a large-scale new energy station. The method comprises the following steps: judging a fault type and a fault phase; the negative sequence impedance of each new energy station is calculated, and the positive sequence initial voltage of each new energy station is calculated; calculating the output short-circuit current of each new energy station; according to the fault composite sequence network, a simplified equivalent circuit is obtained through circuit simplification; calculating the positive sequence voltage of each new energy station; comparing the positive sequence voltage and the positive sequence initial voltage of each new energy station, judging whether a voltage difference value meets convergence precision or not, and solving negative sequence current and zero sequence current output by each new energy station according to a circuit equation; and outputting the output phase current of each new energy station. According to the method, the influence of converter control on a phase selection element is overcome, the number of iterations can be effectively shortened, the process of solving matrix inverse operation by a node voltage method is avoided, and the method has relatively good engineering practicability and precision and can be suitable for a large-scale new energy field station.

The utility model discloses an anti-reverse-rotation electric turning gear which comprises a main machine main shaft, a second motor, a shell, a gear shaft, a transmission sleeve and a main shaft, a first gear is arranged on the gear shaft, an inner gear is arranged on the front section of the transmission sleeve, the first gear is meshed with the inner gear, the rear section of the transmission sleeve is arranged on the main shaft in a sleeved mode, and a clutch is arranged between the main shaft and the second motor. A connecting block is arranged on the shell, a threaded rod is fixedly connected to the output end of the first motor and rotationally connected with the connecting block, a connecting rod is connected to the threaded rod in a threaded mode, a telescopic rod is arranged at the lower end of the connecting rod, an annular groove is formed in the transmission sleeve and matched with the telescopic rod, and an annular brake disc is arranged on the gear shaft. Braking mechanisms are symmetrically arranged on the inner wall of the shell, the braking mechanisms are arranged, the main shaft is locked, it is guaranteed that the main shaft and the hub rotate in place, disassembly and assembly of the wind power generation blades are facilitated, the reverse rotation phenomenon is prevented, and then safety and operability are improved.

The application discloses a terahertz cell-free receiver extrapolation method based on a multi-edge trace Schrodinger bridge. Each terahertz AP measures the transmission delay of a served user and returns the transmission delay to a CPU. Each terahertz AP estimates the user angle and estimates the digital domain channel on a sampling frequency band and returns the digital domain channel to the CPU. The CPU constructs a full-band digital domain channel by using the transmission delay and the sampling frequency band digital domain channel returned by all terahertz APs, calculates an equalization matrix to form a training set, and trains the forward and reverse drift on each Schrodinger bridge. The CPU constructs a multi-edge trace Schrodinger bridge by using a stochastic differential equation, and fits the forward and reverse drift on the training set by using two neural networks. The CPU inferences the equalization matrix by frequency band in the forward and reverse directions by using the trained forward and reverse drift model. The CPU weights the forward and reverse results and equalizes the received signal by frequency band by using all the frequency band digital equalization matrices. The application greatly saves the computing resources of the terahertz cell-free wireless access network.

The utility model relates to the technical field of relays, in particular to a double-shaft-hole connecting mechanism for a relay, which comprises an armature, a push piece and a reed, two sides of the push piece are respectively provided with a double-rod positioning shaft which is detachably connected, and the armature and the reed are connected through the push piece. One side of the armature and one side of the reed which are close to each other are respectively provided with a connecting hole, the connecting holes are matched with the double-rod positioning shaft, the stable assembly is arranged, and the double-rod positioning shaft is connected with the connecting holes, so that the problem that deviation is easy to occur in the assembly process of a single shaft hole is solved, and the assembly efficiency is improved. Furthermore, through the meshing relation between the gear and the rack, the phenomenon of reverse rotation of the two-way threaded rod is avoided, the connection stability between the parts is further improved, the stress between the parts can be uniform, the problem of aggravation of abrasion is further avoided, and therefore the service life of the device is greatly prolonged.

The utility model relates to a detachable extraoral arch muscle agonist which comprises a resin base, a lower jaw tooth groove is formed in the portion, making contact with lower jaw teeth, of the resin base, and an extraoral traction mechanism used for relieving the burden of the teeth is installed on the outer side of the side face of the resin base. The extraoral traction mechanism comprises a connecting outer ring, fixing clamping rings are installed on the two sides of the bottom of the connecting outer ring, rotating springs are fixedly installed at the two ends of the connecting outer ring, and extraoral bow assemblies facilitating belt taking are installed on the two sides of the top of the connecting outer ring. The extra-oral traction mechanism is arranged, so that the extra-oral arch body is detachable, the tooth burden can be relieved, the possible inward inclination of the upper anterior teeth can be prevented, the upper anterior teeth can be conveniently taken out, and the forward extension of the upper anterior teeth can be better inhibited through the backward traction force of the extra-oral arch body and the inward contraction of the upper anterior teeth under the stress.

The application discloses a power grid carbon emission flow dynamic tracking method based on a physical guided graph neural network, and belongs to the technical field of power system operation analysis and low-carbon dispatching, and comprises the following steps: collecting power grid data in real time and dynamically constructing a power grid topology graph structure; inputting the graph structure into a physical guided graph attention network model trained through a loss function containing physical constraints, wherein the model fuses the edge features of line power and impedance when calculating attention coefficients, so as to infer the carbon potential of all nodes in the network; based on the inferred carbon potential, using a breadth-first search algorithm to start from a load node, tracking and proportionally allocating in the reverse direction along the active power flow path, and determining the carbon emission contribution of the generator set. The application ensures the physical consistency and precision of carbon flow tracking under the condition of lacking real labels, and significantly improves the efficiency of large-scale power grid carbon flow analysis and the adaptability to topology changes.

The invention relates to the technical field of nut mounting equipment, and discloses a conveying mechanism, a directional clamping system and a nut beating machine. The conveying mechanism is used for conveying plastic nuts, each plastic nut comprises a long-strip-shaped main body part and an opening end arranged at one end of the main body part, and an annular boss is arranged on the periphery of the opening end; the conveying mechanism comprises a vibration disc used for containing the plastic nuts; the conveying track is connected to the outlet of the vibration disc, the conveying track comprises a containing cavity and a step part, and the step part is arranged at the opening of the containing cavity; the vibration disc is used for driving the plastic nut to jump, so that when the plastic nut enters the conveying rail from an outlet of the vibration disc, the main body part is located in the containing cavity, and the annular boss is in lap joint with the step part. Plastic nuts are prevented from inclining during transportation through the limiting effect of the containing cavity and the step part, the position accuracy of the plastic nuts in the vertical posture during transportation is kept, a clamping mechanism of the nut beating machine can clamp the plastic nuts correctly, and therefore normal nut beating operation is guaranteed.

This application provides a real-time hyperspectral local anomaly detection method and device based on multi-line, multi-band recursive updates. The method includes: acquiring new data blocks for a target scene in real time using a filter array spectral imaging system; updating the current global mean vector and the multi-line, multi-band correlation matrix used for background modeling for the target scene using a recursive update formula to obtain the updated global mean vector and the updated multi-line, multi-band correlation matrix; acquiring the local spatial neighborhood statistics of the new data blocks; and performing local anomaly detection on the new data blocks based on the local spatial neighborhood statistics to obtain the current anomaly detection result data for the target scene. This application can realize local anomaly detection for multi-line, multi-band hyperspectral data and can solve the problems of high computational cost, large storage requirements, and insufficient real-time performance of traditional global covariance matrix calculations in complex industrial backgrounds.

The application discloses a dynamic load prediction method and equipment for a double-layer vibration isolation system under a variable stiffness condition. The method first establishes a multi-degree-of-freedom dynamic model of the double-layer vibration isolation system, then describes the structure displacement based on a frequency domain transfer function, further deduces a function expression of the to-be-identified dynamic load about the dynamic characteristics of the double-layer vibration isolation system, and finally obtains a relationship between the to-be-identified dynamic loads before and after the variable stiffness. When the stiffness of the lower layer structure of the double-layer vibration isolation system of a mechanical equipment changes, the dynamic load borne by the lower layer structure needs to be accurately predicted to guarantee the safe and stable operation of the equipment. The method is simple and easy to implement, and only needs the dynamic characteristics of the structure to identify the dynamic load, thereby avoiding the inverse operation in the traditional dynamic load identification method and improving the identification precision. In addition, under the variable stiffness condition, the method can quickly predict the load after the variable stiffness on the basis of the load identified before the variable stiffness, and compared with the traditional dynamic load identification method, the identification efficiency is improved.

The invention discloses a rapid setting algorithm and device for an initial weight of an environment sound adaptive noise reduction filter for auscultation, a medium and equipment. According to the algorithm, pulse responses of a main channel and an auxiliary channel are collected at the same time in a quiet environment; deconvolution is carried out on the main channel impulse response by taking the auxiliary channel impulse response as a kernel, and an obtained result is the impulse response of the adaptive filter expectation model; and finally, determining the order and the initial weight of the adaptive filter according to the pulse response obtained by deconvolution. The algorithm is small in calculation amount, the initial weight and order of the adaptive filter can be determined on line, and the algorithm is suitable for assembly line batch production.

The utility model discloses an efficient shock-absorbing and buffering device for a bullet train, which belongs to the field of bullet trains and comprises a connecting shaft sleeve sleeved on a shaft lever of a wheel and a shock-absorbing and buffering mechanism mounted between the connecting shaft sleeve and a beam frame of the bullet train. The buffering mechanism comprises a telescopic rod piece and a buffering spring slidably arranged outside the telescopic rod piece in a sleeving mode, the bottom of the telescopic rod piece is sleeved with an adjusting plate making contact with the bottom of the buffering spring in a threaded mode, and the top of the telescopic rod piece is slidably sleeved with a lantern ring making contact with the top of the buffering spring. The outer side of the end of the telescopic rod piece is fixedly sleeved with a fixing plate used for limiting the lantern ring. The spring fixedly installed on the bullet train damping and buffering device is changed into the design convenient to disassemble and replace, due to the design convenient to disassemble, when the spring is damaged or needs to be replaced, maintenance personnel can operate more quickly, the downtime of the bullet train is shortened, the maintenance efficiency is improved, the maintenance cost is reduced, and safety is improved.

The invention discloses a lens film changing device for an endoscope, and the device comprises a housing which is connected with an inner sleeve and an outer sleeve; an inner cavity of the inner sleeve can allow the endoscope to pass through, and a film changing channel is arranged between the outer sleeve and the inner sleeve and is communicated with the inner cavity of the shell; the film unwinding reel and the film winding reel are mounted in the shell and can rotate around the axial direction of the film unwinding reel and the film winding reel; one end of the lens film is connected to the film unwinding reel in a winding manner, and the other end of the lens film is connected to the film winding reel in a winding manner; the part, located outside the film unwinding reel and the film winding reel, of the lens film penetrates through the film changing channel and passes through the end opening of the inner sleeve. And the mechanical driving piece is in direct or indirect transmission connection with the film winding reel and is used for driving the film winding reel to rotate forwards around the own axial direction so as to drive the lens film to pass through the end opening of the inner sleeve in sequence. The mechanical film changing mode does not need to take the endoscope out of the body for cleaning, so that the operation is simpler and more convenient; stable power supply is not needed in the membrane replacement process, and the safety in the operation process can be improved.

The application provides a low-orbit satellite NOMA-OTFS system power distribution joint signal detection method for user fairness, which encapsulates a signal detection process as a fitness function in power distribution optimization under a total transmission power constraint, realizes collaborative design of power distribution and signal detection through construction of a closed-loop optimization mechanism based on detection feedback, and solves the problems of mutual independence of power distribution and signal detection, difficulty in giving consideration to user fairness and system capacity, and high resource consumption of a detection process in the prior art. Through introduction of an optimization mechanism based on a detection result, power distribution can be directly adjusted according to actual detection performance, thereby effectively improving weak user communication quality, enhancing system fairness, reducing calculation complexity, and improving overall system transmission performance.

The utility model relates to a spacer for a high-voltage line, and relates to the technical field of spacers, the spacer comprises a frame body and a plurality of wire clamp assemblies arranged on the frame body, the frame body comprises two support frames arranged oppositely, the wire clamp assembly comprises a wire clamp body rotationally arranged on the supporting frame, a wire clamp cover plate installed on the wire clamp body and an elastic clamping block; the side surfaces, close to each other, of the wire clamp body and the wire clamp cover plate are provided with accommodating grooves for accommodating the elastic clamping blocks, and the side surfaces, close to each other, of the elastic clamping blocks are provided with clamping grooves for fixing a cable. A plurality of positioning insertion blocks are arranged on the side face, away from the clamping groove, of the elastic clamping block, and positioning insertion grooves allowing the positioning insertion blocks to be embedded and a containing groove allowing glue to be contained and placed are formed in the side wall of the containing groove. According to the installation structure, the possibility that the elastic clamping blocks are loosened and even fall off during installation in windy and rainy days is reduced, and the installation stability of the elastic clamping blocks is improved.

This invention discloses a piecewise adaptive Kalman track tracking method and apparatus based on residual classification, relating to the field of radar track tracking technology. Addressing the problems of poor adaptability to non-stationary measurement noise environments, parameter dependence on human experience, and complex FPGA implementation in existing track tracking methods, this invention proposes introducing a residual classification decision and piecewise adaptive noise adjustment mechanism into the Kalman filter recursive framework. First, a residual vector is calculated based on the predicted state and measurement data. Then, a classification decision is made using the residual vector, the predicted covariance, and the measurement noise covariance of the previous cycle, outputting the measurement quality level. Next, the measurement noise covariance is updated piecewise adaptively based on the measurement quality level. Finally, the filter gain is calculated based on the updated measurement noise covariance and the predicted covariance to complete the correction and update of the state and covariance.

The utility model relates to a system for preventing centrifugal supercharger impeller reverse rotation relates to supercharger field, including electric regulating valve, solenoid valve and manual ball valve, electric regulating valve input is connected with compressor output through pipeline, and electric regulating valve output is connected with compressor input through pipeline, and solenoden valve is connected with electric regulating valve in parallel through pipeline, and two manual ball valves are fixedly connected on solenoden valve input pipeline and output pipeline respectively to control natural gas flow direction electric regulating valve or solenoid valve, and the high pressure natural gas of compressor output flows through solenoid valve and flows to compressor input more quickly to balance the pressure difference before and after compressor and prevent impeller reverse rotation, the utility model has the advantages of realizing the quick balance to the supercharger entrance and exit pressure, avoiding impeller reverse rotation.

This invention discloses a method for forming nulls in the beam pattern of an array antenna in a specified direction, belonging to the field of electronic defense technology. The method includes the following steps: S1, calculating the weighting coefficients of the signal for each antenna element using an iterative solution method to obtain multiple weighting coefficients; S2, using the multiple weighting coefficients obtained in step S1 to weight the signal passing through multiple antenna elements, thereby forming the main beam of the antenna pattern in the specified direction and simultaneously forming nulls in the antenna beam pattern in other specified directions. Based on this invention, the method can effectively control the null depth in the null direction and achieve the beneficial effect of rapid and effective null beam modulation.

The utility model relates to the technical field of dry-type transformers, and provides a self-cooled dry-type transformer which comprises a base, a transformer body is fixedly connected to the outer wall of the base, a top plate is fixedly connected to the upper portion of the transformer body, a motor is fixedly connected to the surface of the base, an output shaft of the motor is fixedly connected with a rotating rod, and the rotating rod is fixedly connected with the transformer body. The rotating rod is movably connected with a rotating direction adjusting device through a fixedly-connected small gear, the rotating direction adjusting device is movably connected with a lubricating assembly, and the rotating direction adjusting device comprises a sliding rail. Through the arrangement of the rotation direction adjusting device, when the iron ring rotates in the forward direction, the protruding block is attached to the outer wall of the extrusion block, the iron ring directly and rapidly passes through the extrusion block, after the iron ring stops rotating, the iron ring possibly rotates reversely due to the inertia effect, at the moment, the protruding edge of the extrusion block blocks the moving protruding block, the reverse rotation phenomenon is avoided, and meanwhile the iron ring is prevented from being damaged. The lubricating function is achieved through the effect of the extrusion block and the follow-up linkage effect.

The utility model relates to the technical field of battery cell processing equipment, in particular to a tab flattening mechanism and battery cell winding equipment. A tab flattening mechanism comprises a first flattening assembly, a second flattening assembly and a third flattening assembly, the first flattening assembly is used for being arranged on a movement path of a first tab on a first pole piece, and the first flattening assembly can flatten the first tab before the first tab is wound around a winding needle; the second flattening assembly is used for being arranged on a movement path of a second pole lug on a second pole piece, and the second flattening assembly can flatten the second pole lug before the second pole lug is wound on the winding needle; wherein the first tab is one of an anode tab and a cathode tab, and the second tab is the other one of the anode tab and the cathode tab. According to the tab flattening mechanism provided by the invention, the condition that any one of the anode tab and the cathode tab is turned inwards or outwards can be avoided, so that the quality of a battery cell formed by winding is better.

The utility model belongs to the technical field of stem cell transportation, and particularly relates to a portable ultralow-temperature stem cell transportation box which comprises a heat preservation box body, a limiting mechanism and a refrigeration mechanism. The heat preservation box body comprises a breathable plate, a net plate and a partition plate, the breathable plate is fixedly connected to the interior of the heat preservation box body, the net plate is fixedly installed in the heat preservation box body, the partition plate is slidably connected to the surface of the net plate, the limiting mechanism is arranged at the top of the partition plate, and the refrigeration mechanism is arranged in the heat preservation box body; the limiting mechanism comprises a fixing piece, a limiting hole, a limiting column, a square plate, a spring and a connecting rod, the fixing piece is fixedly connected to the top of the partition plate, and the problems that stem cells of different patients are prone to being mixed up due to the fact that the stem cells are stacked in an existing refrigerating box in the using process, and meanwhile during transportation, the stem cells are prone to being damaged are solved. The stem cells cannot be fixedly limited in the box body, so that the stem cells are easily inversely placed in the refrigerating box and are inconvenient to take out.

The present invention discloses a data dimensionality reduction method based on Fourier domain principal component analysis. By projecting high-dimensional data into the Fourier domain and utilizing the properties of circulant matrices and Fourier matrices, the problem of solving eigenvectors in principal component analysis is transformed into finding a meaningful Fourier domain basis. Since the Fourier domain basis is predefined and the principal component distribution of the data is ordered, the training can be accelerated by inputting the training samples in batches until the required Fourier basis is stable and ordered. The number of Fourier bases and the projection matrix are determined, and the projection matrix is ​​multiplied by the high-dimensional data set to obtain a low-dimensional data set to facilitate rapid data processing. The data dimensionality reduction method provided by the present invention, based on principal component analysis and fast Fourier transform, can remove noise and redundant information in high-dimensional data sets, reduce unnecessary calculation processes in data processing, and improve the running speed and memory efficiency of the algorithm.

The application relates to a support structure for a cable tower closure section, which comprises: a bracket, comprising opposite first and second sides; the inner walls of two middle tower columns are respectively anchored with the brackets, and the second sides of the two brackets are parallel to each other; a vertical support structure, comprising vertical supports and bearing beams; the vertical supports are supported below the bottom formwork of the closure section; a horizontal support structure, comprising horizontal support members and wedge-shaped members; the horizontal support members comprise first plate bodies, second plate bodies and support rods; the support rods are respectively connected with the first plate bodies and the second plate bodies; the first plate bodies comprise first surfaces away from the support rods, and the second plate bodies comprise second surfaces away from the support rods; the first surfaces are parallel to the second sides of the brackets and abut against the second sides; the second surfaces are inclined relative to the first surfaces, and the wedge-shaped members are inserted between the second plate bodies and the brackets. The utility model can provide vertical and horizontal supports for the closure section and the middle tower columns, and has the advantages of simple structure and low cost.

The utility model relates to a cylinder electrode assembly, including main part and tab part, the main part is wound into the cylinder shape, the tab part is connected with the main part end portion, the tab part includes a plurality of layers of tabs, each layer of tab has a first end portion and a second end portion in the height direction, the first end portion is connected with the main part, and the second end portion is connected with the main part. The plurality of layers of tabs of the same tab part are sequentially overlapped, the first end parts of the plurality of layers of tabs of the same tab part are sequentially arranged along the radial direction of the main body part, and the plurality of layers of tabs of the same tab part lodging towards the central side of the main body part to form a flattening tab area; in the multiple layers of tabs which are sequentially stacked in the radial direction of the main body part away from the center of the main body part, the heights of the tabs from the first layer to the Nth layer are gradually increased, and the heights of the tabs from the Nth layer to the Mth layer are the same; wherein N is a positive integer greater than 1, and M is a positive integer greater than N. According to the utility model, the welding size of the leveling tab area along the radius direction of the main body part can be increased, the transmission distance of electrons is reduced, the internal resistance and polarization of the battery are reduced, and the performance of the battery is improved.

The application relates to a material tower taper detection technical field, in particular to a material tower core mold taper part radius real-time determination structure and a winding forming system and method, a wire wheel is arranged on a pull rod, the top end of the pull rod is fixedly connected with an outer rod, the inner side of the outer rod is slidably connected with an inner rod, the inner rod can abut against the surface of the taper part upwards, the bottom end of the inner rod is a piston, a second spring is fixedly connected between the piston and the inner side of the outer rod, a potentiometer is fixedly connected on one side of the inner rod, a fixed block is fixedly connected on the inner side of the top end of the outer rod, the fixed block slides on the potentiometer, the real-time radius of the winding position of the taper part is obtained by obtaining the position of the fixed block on the potentiometer, the pull rod moves rightwards under the driving of a lead screw, the wire wheel moves rightwards synchronously, winding movement is realized, the outer rod bends to one side, so that the middle surface of the inner rod and the wire wheel is in the same plane, and the real-time radius of the winding position of the taper part is obtained by obtaining the position of the fixed block on the potentiometer.

This invention discloses a method for obtaining beamforming weight vectors in an integrated radar-communication system, within the field of array signal processing technology. The method comprises the following steps: S1: Establishing a receiver signal model for a uniform linear array antenna in the integrated radar-communication system; S2: Introducing orthogonal polynomials and the Gauss-Legendal numerical integration method to perform a low-complexity, fast fitting solution for the interference subspace; S3: Introducing the Schmitt orthogonalization method to recursively solve the orthogonal complement projection operator of the interference subspace and project it to obtain the beamforming weight vector; S4: Introducing an equivalent representation of the beamforming weight vector under a dual-phase shifter architecture to obtain the updated beamforming weight vector value under the dual-phase shifter architecture. This beamforming weight vector acquisition method solves the problems of high computational complexity, poor performance in low-quantization-bit hardware scenarios, and desired signal suppression under high signal-to-interference-plus-noise ratios in existing methods, achieving low-complexity and highly robust beamforming.

The utility model discloses a kind of anti-back material devices of climbing conveyor, solve the problem that belt conveyor in prior art will appear reverse after power failure. The utility model includes base, a pair of installation arms are rotationally arranged on base, respectively mirror image symmetry are arranged on two installation arms for the brake mechanism for brake conveyor output shaft, drive mechanism is arranged on base and respectively connected with two installation arms, and reset mechanism is arranged between two installation arms. The utility model reset mechanism can move in the direction of conveyor output shaft after power failure of conveyor, installation arm drives brake mechanism to move synchronously, and make brake mechanism contact with conveyor output shaft, so as to brake conveyor output shaft, so as to prevent reverse phenomenon of conveyor output shaft after power failure.

The utility model particularly relates to a paper roller packing device, which belongs to the technical field of paper roller transportation and comprises a base, a packing mechanism used for winding a plastic film is arranged on the upper surface of the base, two supporting frames are arranged on the upper surface of the packing mechanism, and supporting rollers are rotatably connected into the two supporting frames. A paper roller body located between the opposite sides of the two supporting frames is fixed to the outer side of the supporting roller, and a driving mechanism used for driving the supporting roller to automatically rotate is arranged on the right side of the supporting frame on the right side. According to the paper roller packing device, the driving mechanism drives the supporting roller to automatically rotate through cooperation of the limiting block, the air cylinder, the movable box, the motor, the rotating plate and the first positioning rod, so that the paper roller body is driven to continuously rotate in one direction, and the reverse rotation phenomenon caused by manual operation of workers is avoided; and meanwhile, the supporting roller is positioned through cooperation of a second positioning rod, a positioning plate, a second fixing plate and a rotating disc.