17results about How to "Reduce fit error" patented technology

The invention discloses a method for measuring a magnetic field of an inertial measurement system, which realizes accurate reconstruction of a global magnetic field vector field by planning a discrete point test layout, synchronously acquiring multi-dimensional data and constructing a magnetic field vector fitting model. The method comprises the steps of test area division and discrete point layout, multi-source data synchronous acquisition, data preprocessing and abnormal value elimination, global magnetic field vector field fitting modeling, and fitting result verification and optimization. According to the method, a discrete point layering layout strategy is adopted, a multivariable fitting algorithm is combined, magnetic field space change characteristics can be effectively captured, global magnetic field vector field fitting errors are controlled, and the method is suitable for inertial measurement system magnetic field performance detection and optimization design and has the advantages of being high in measurement speed, high in representation precision and high in practicability.

The utility model relates to a projector which comprises a shell, an optical machine assembly and an external lens. The shell is provided with a containing cavity and an opening, and the opening is used for communicating the containing cavity with the external space of the shell. And the ray machine assembly is arranged in the accommodating cavity and comprises a ray machine lens. One end of the external lens penetrates through the opening, is matched with the ray machine lens shaft hole and is used for being matched with the ray machine lens to carry out image projection; the external lens is detachably installed on the ray machine assembly.

This invention relates to the field of spring clip molding technology, and particularly to a spring clip molding mold and process based on long carbon fiber reinforcement. The mold includes an upper pressure plate, a lower pressure plate, and an upper pressure head. An upper mold cavity seat, a middle transition body, and a bottom support leg are vertically arranged between the upper and lower pressure plates. A push rod is provided on the inner side of the bottom support leg. A cylindrical mold cavity hole is provided inside the upper mold cavity seat, and two L-shaped side sliders and a central core assembly are arranged inside the cylindrical mold cavity hole. The process steps include: mixing long carbon fibers with a thermoplastic matrix, heating to obtain a melt, transferring the melt into a mold, closing the mold and applying pressure, and obtaining a hollow cylindrical blank after holding pressure and cooling. The hollow cylindrical blank is then cut and machined. This invention eliminates the prepreg preparation process, resulting in a shorter process flow, higher production efficiency, better uniformity of spring clip dimensions, continuous and intact fibers in the groove area, and significantly improved mechanical properties.

The invention relates to a road alignment safety evaluation method based on three-dimensional point cloud spatial modeling, and aims to overcome the defects of poor adaptability of a road surface point cloud segmentation algorithm and strong dependency of vertical line fitting on a road marking in a complex scene by utilizing characteristics of obtained high-density point cloud data. The road key information collaborative extraction method comprises the following steps: firstly, reducing the influence of environmental noise on road surface features through a normalized gradient filtering algorithm and a statistical outlier filtering algorithm; secondly, constructing a joint clustering model and an interactive region growing algorithm considering elevation, normal vector and pavement material reflection heterogeneity, and realizing precise segmentation of pavement point cloud in a complex scene; and then extracting a road surface edge line, obtaining road center line data, and generating a safety evaluation result list based on road center line parameters of a road plane, a longitudinal section and a cross section line shape. The research results provide technical support for application scenes such as road maintenance detection and automatic driving high-precision map construction.

The invention relates to the technical field of silicon wafer detection, and discloses a silicon wafer multi-defect decoupling weighted fitting method and device and a storage medium, and the method comprises the steps: S1, obtaining original point cloud data, S2, calculating a gradient G and a local variance Var (z), recognizing a defect dominant type, S3, stripping defects and noise through a multi-defect coupling model, and obtaining a real surface type point cloud; according to the method, the problems of defect confusion and non-uniform global precision of a traditional technology are solved, self-adaptive adaptation of different defect scenes is realized, manual intervention is not needed, the fitting precision of r, k and Sq is greatly improved, the detection error of a multi-defect superposition scene is controlled, and the detection accuracy of the multi-defect superposition scene is improved. The detection efficiency is guaranteed, and the industrial mass production requirement is met.

The invention relates to a data-driven load frequency control method for a power system containing a network-forming converter. The method comprises the following steps: firstly, according to a power system topology, constructing a time-delay nonlinear load frequency control model containing a network construction type converter; taking the model as an environment, simulating operation acquisition data by using a PID controller, and constructing a pre-training data set; then, an agent of an actor-commentator framework is constructed, and offline pre-training is completed through a data set; and finally, accessing the intelligent agent into a system for online interaction, outputting a frequency modulation instruction by an action network, and iteratively updating parameters by combining an award and a loss function to realize self-adaptive control. Compared with the prior art, the method has the advantages of being adaptive to the dynamic characteristics of the GFM, efficient, high in robustness and the like.

According to the building energy consumption prediction method and system based on multi-frequency characteristic decomposition and double-branch modeling provided by the invention, a complete ensemble empirical mode decomposition (CEEMDAN) adaptive noise algorithm is introduced to perform multi-scale decomposition on a building energy consumption signal, so that the decomposability and the signal stability of an original energy consumption sequence are greatly improved. The CEEMDAN decomposition mechanism ensures that different frequency components are effectively distinguished before modeling, and the problems of mode aliasing and feature distortion caused by direct modeling of non-stationary signals are avoided. And through an adaptive grouping strategy based on variance entropy, the decomposed signals are automatically classified and reconstructed, so that high-frequency disturbance and low-frequency trend can be modeled in a targeted manner, and the feature expression ability and generalization performance of the model are further improved.

This application provides a weighing method, a vehicle controller, and an electric loader, relating to the field of electric loader technology. The method responds to a boom lifting signal, acquires weighing parameters within a preset sampling range when lifting the object to be weighed, including average main valve pressure, handle opening, hydraulic oil temperature, and slope; determines whether the electric loader has automatic weighing enabled; if automatic weighing is not enabled, the initial mass of the object to be weighed is obtained based on the average main valve pressure, handle opening, and a preset first weighing fitting formula; if automatic weighing is enabled, the initial mass of the object to be weighed is obtained based on the average main valve pressure and a preset second weighing fitting formula; and compensates for the initial mass of the object to be weighed based on the hydraulic oil temperature and slope to obtain and output the target mass of the object. This method can improve the accuracy of dynamic weighing of the electric loader without increasing equipment costs.

This invention discloses a large-format split-type laser cutting machine bed connection structure and assembly method, including a movable crossbeam, with a laser cutting machine bed located below both ends of the movable crossbeam. The laser cutting machine bed includes a first bed, a second bed at one end of the first bed, and connecting plates on both sides of the adjacent ends of the first and second beds. First pin grooves are provided on both sides of the joint of the connecting plates, and first pin keys are provided within the first pin grooves. Second pin grooves are provided on the adjacent upper surfaces of the first and second beds. This invention moves the bed through the cooperation of nuts and screws, which is safer and more stable, saving manpower. The cooperation of guide columns and guide holes can accurately position the connection between the two beds, reducing cooperation errors and improving cooperation accuracy. The first and second pin keys are adjusted in size through grinding, so that the pin keys and pin grooves fit tightly, which can limit the position of the two beds, preventing processing vibration from affecting the bed and improving processing accuracy.

The application discloses a parameterized human body model reconstruction method based on a Chinese database, three-dimensional human body grid data of multiple female naked bodies of different ages, body types and heights are collected to establish a database; point clouds are learned based on BPS, SMPL model grid points are respectively roughly registered to the vicinity of each three-dimensional human body grid point to generate corresponding rough registration models; then, a non-rigid grid registration algorithm based on an ICP algorithm is used to finely register each rough registration model to generate corresponding SMPLD models; each SMPLD model is corrected in a standard standing posture, and then PCA principal component analysis is performed on each SMPLD model after the standing posture correction, a plurality of principal component proportions obtained are used as body parameters of a parameterized human body model adapted to Chinese body shapes, original posture parameters of the SMPL model are used as posture parameters of the parameterized human body model adapted to Chinese body shapes, and a final parameterized human body model is constructed.

The application discloses a radar single-pulse angle discrimination curve fitting method based on cost sensitivity weighting, which comprises the following steps: 1, measuring sum-difference beam patterns of multiple wave positions in a microwave darkroom or an ideal field environment, and extracting original measurement values of angle discrimination curves in an angle range of interest; 2, constructing a measurement value combination for joint fitting of the angle discrimination function of multiple wave positions; 3, constructing a polynomial fitting optimization problem based on a least square criterion; 4, designing a cost sensitivity function and related parameters according to actual application requirements, and further correcting the cost function; 5, calculating intermediate variables and solving fitting coefficients; and 6, in a radar actual working project, on-line single-pulse angle measurement is completed based on the angle discrimination function obtained through fitting. Through simple parameter setting, the fitting accuracy of targets near the beam pointing direction and targets far away from the beam pointing direction can be flexibly adjusted according to actual application requirements.

The application discloses a method and device for calculating nominal electric field of direct current transmission based on a firefly algorithm, and relates to the technical field of high-voltage engineering and computational electromagnetics. The method comprises the following steps: obtaining transmission line parameters, setting the number of simulation electric charges, the number and coordinates of matching points and verification points for each conductor, and calling a preset simulation electric charge method calculation framework to solve simulation electric charge quantity vectors and target functions; encoding all simulation electric charge coordinates into optimization variables, randomly generating an initial population and calculating brightness through the firefly algorithm, iteratively optimizing simulation electric charge positions, and finally obtaining a terminal generation optimal simulation electric charge position vector, which is substituted into the calculation framework to calculate a terminal generation optimal simulation electric charge quantity vector, and then the ground nominal electric field is solved. The optimal position of the simulation electric charge is searched through the firefly algorithm, the calculation precision of the ground electric field of the direct current transmission line is improved, and reliable technical support is provided for the ground nominal electric field evaluation under the static electric field condition of the direct current transmission line.

The application relates to the technical field of water level prediction, and particularly discloses a basin water level prediction system and method for complex terrains, wherein the method is characterized in that: a feature screening algorithm is used to screen a preliminary model feature set, and effective features which have a significant influence on the transit of a flood peak and the risk of backflow are reserved; the effective features are scientifically divided into a training set and a test set; the training set is used to enable the model to fully learn the mapping relationship between the buffer state of a buffer confluence unit, the flood discharge, the movement of the flood peak and the change of the confluence water level under complex terrains; and the fusion of hydrological data and topographic image data covers key influence factors in the time and space dimensions on the data level; the water flow lagging effect is captured through an upstream water level lagging feature set on the feature level; the discharge position is accurately positioned in combination with the discharge channel and the buffer state of the buffer confluence unit; and the transit path of the flood peak and the peak water level are simulated, so that the accurate simulation of the transit of the flood peak in the complex terrain and the reliable prediction of the backflow risk can be realized.

The application discloses a kind of power transmission methods and mechanism of boxing machine, it is related to the technical field of boxing machine, by the design of independent main shaft centralized for each system energy supply, replace the independent power source and the diversified power transmission mode of each system in the prior art, realize the power synchronous transmission of boxing machine feeding, pushing material, opening box, instruction manual folding and throwing, sealing box output whole process, cancel each system independent power source, greatly reduce the use of motor, speed reducer and other power components, simplify the overall transmission structure of boxing machine, reduce the early manufacturing cost and processing technology requirement of equipment, and also reduce the matching error and fault point between components, ensure the stability and reliability of power transmission, equipment can long time continuous stable operation, reduce the maintenance cost and downtime loss of later period.

This utility model discloses a simple tube locking structure and a photographic bracket. The tube locking structure includes a first leg tube assembly, a second leg tube assembly, a third leg tube assembly, a first base, a second base, and a third base. It also includes a latch, a pressure plate, a first drive block, a second drive block, a pull rod, and a locking component. The latch and pressure plate work together to lock or release the first leg tube assembly from the second leg tube assembly, and the latch, the first drive block, the second drive block, the pull rod, and the locking component work together to lock or release the second leg tube assembly from the third leg tube assembly. The structure has few parts and a compact layout, which not only reduces assembly difficulty and production costs, but also reduces the fit error between parts, improves the overall reliability of the structure, and facilitates disassembly and replacement of parts during later maintenance.

This invention discloses a multi-piston rod cylinder and its working method, belonging to the field of pneumatic components. The multi-piston rod cylinder includes: a cylinder body, at least two piston rods, and a piston element connected to the piston rods. The cylinder body has at least two piston chambers and several air ports. Each piston chamber contains at least one piston rod and a piston element. The piston element divides the piston chamber into a rod-side chamber and a rodless chamber. Each air port communicates with at least one rod-side chamber and / or a rodless chamber. Each piston chamber includes: at least one first piston chamber and at least one second piston chamber. The central axes of the first and second piston chambers are set at a predetermined angle. The central axis of the piston rod is parallel or collinear with the central axis of the corresponding piston chamber. This invention solves the problems of large assembly errors between the cylinder and connecting parts in existing technologies, and the excessive size making it unsuitable for use in space-constrained precision equipment.

The utility model discloses an automobile roof handle integrated damping rotating mechanism which comprises a handle body, installation grooves are formed in the two ends of the handle body, the installation grooves are rotationally connected with fixing bases, and the fixing bases comprise the first fixing base and the second fixing base. The first fixing base is rotationally connected with the handle body through a first pin shaft, the first pin shaft is provided with a damper, the damper comprises a damping shell and a damping rotor, the damping shell is arranged on the outer side of the damping rotor in a sleeving mode, a left fixing block is arranged on the left end face of the damping rotor, and a right fixing block is arranged on the right end face of the damping rotor; the left fixing block and the right fixing block are arranged at the two ends of the damping rotor respectively, and the fixing grooves matched with the left fixing block and the right fixing block are formed in the first fixing base respectively, so that rigid connection between the damping rotor and the first fixing base is achieved, and the two ends of the damping rotor are tightly matched with the first fixing base; and the matching error between the damping rotor and the first fixed base is reduced, and the damping effect stability is ensured.