125results about How to "Rapid design" patented technology

The invention belongs to the technical field of Linux kernel schedulers, and particularly relates to a Linux kernel scheduler parameter optimization system and method.The Linux kernel scheduler parameter optimization system comprises a data collection module, a large model training and optimization module, a kernel scheduler module, a code generation and verification module, a small model training module and a small model reasoning module; the large model is responsible for periodically providing a visual angle of global optimization, generating an initial weight and a scheduler prototype of the small model, extracting a rule from long-term accumulated data, and ensuring that an optimization strategy has a global visual field. Meanwhile, the small model serves as a local adapter to process the dynamic scheduling requirement of a kernel mode in real time. The layered optimization mechanism can balance short-term adaptability and long-term performance improvement.

The invention provides a business process construction method combining a workflow engine and a dynamic form, which relates to the technical field of low-code platforms, and comprises the following steps of: establishing a data table according to a business, selecting and importing the data table in a code generation module, generating a basic code package, re-operating a main program compiling code package and loading the code package to a JVM (Java Virtual Machine) operating environment; creating a dynamic form on the basis of the entity class information of the code package through a visual form designer of the dynamic form module, and outputting dynamic form configuration in a JSON (JavaScript Object Notation) format; according to the method, the dynamic form and the process engine are combined, highly flexible business process design can be realized, a user can dynamically design the form and the process model as required to meet different business requirements, and the user-defined component can be designed according to a business data structure and common functions, so that the form can better adapt to a specific business scene, and the user experience is improved. And the user experience and the working efficiency are improved.

The invention provides a firearm process cross-region collaborative design method and system based on model definition, and relates to the field of firearm design. The method comprises the following steps: defining product process information as a three-dimensional model structure file; wherein the three-dimensional model structure file comprises a top layer structure, a primary component and a secondary component; the top layer structure is a part model or a final assembly model, the first-stage component is a trial-manufacture process model containing process information, and the second-stage component is a trial-manufacture step model containing step information; transmitting the three-dimensional model structure file to a factory end in a cross-region manner based on collaborative distribution of data between factories; and reading the three-dimensional model structure file at a factory side, analyzing the process content and the step content in the three-dimensional model structure file, and editing and modifying the analysis result according to the production field condition, thereby realizing the firearm process cross-region collaborative design. According to the method and the device, the correlation between the process data and the three-dimensional design model is realized, and the data consistency is ensured.

The invention belongs to the technical field of gearbox shaft end sealing, and particularly relates to a motor vehicle shaft end double-blade sealing device and a shaft end sealing design method.The method comprises the following steps that S1, working condition parameters are determined; s2, designing a double-blade impeller; s3, designing a sealing structure; and S4, outputting a design result. The sealing effect is good, the double-blade impeller and the staggered labyrinth seal are combined, and the sealing performance of the shaft end of the gearbox is effectively improved; the operation and maintenance cost is reduced, and the operation and maintenance interval can be effectively prolonged and the operation and maintenance investment is reduced; the reliability is high, a non-contact sealing mode is adopted completely, and the reliability of the double-blade impeller structure is high; and the design and three-dimensional modeling work of the shaft end sealing device can be automatically completed according to the determined environmental parameters and boundary dimension requirements, and a user can complete the design adjustment work of the shaft end sealing device through one key based on reliability redundancy.

The invention belongs to the technical field of data processing, particularly relates to a BIM-based intelligent medical building design optimization method and system, and aims to solve the problems of high error rate and low optimization efficiency when real-time data is processed by a BIM model. The method comprises the following steps: acquiring a BIM model of a medical building, construction data and user input, establishing a mirror image model, detecting and correcting real-time data, processing the corrected data, detecting the real-time data by using a dynamic data detection model, correcting the data according to an error result, and optimizing the BIM model in combination with historical data. According to the method, the accuracy and optimization efficiency of the BIM model are improved, and efficient design, operation and maintenance of an intelligent medical building are supported.

The invention provides a double-groove structure design method for enhancing the sorting performance of a spiral chute, and relates to the technical field of spiral chute structural design. The double-groove structure design method comprises the steps that S1, the inner diameter and the outer diameter of a first groove and the outer diameter of a second groove are selected; s2, selecting a groove spiral line form as an equiangular spiral line, and selecting equiangular spiral line spiral angles of the first groove and the second groove; s3, selecting the maximum depth and the minimum depth of the groove; s4, an adjacent angle between the first groove and the second groove is selected, and the width of the grooves and the total number of the grooves of the spiral chute are selected; s5, the vertical distance between an outlet of the second groove and an inlet of the first groove is selected; and S6, performance checking is conducted on the designed double-groove structure used for enhancing the sorting performance of the spiral chute, if the performance meets the standard, design is ended, and if the performance does not meet the standard, the steps 1-6 are repeated. Rapid and efficient design of the groove structure can be achieved, and powerful technical support is provided for improving the performance of the spiral chute.

The invention discloses a large-scale solid heat storage system and a control method, the system comprises a plurality of heat storage subareas, the heat storage subareas are arranged in parallel, inlets of the heat storage subareas are jointly connected with a main heat storage pipeline, and outlets of the heat storage subareas are jointly connected with a main heat release pipeline; each heat storage subarea comprises a plurality of heat storage pipe sections, the inlet pipe section of each heat storage pipe section is provided with a pipe section inlet valve, the outlet pipe section of each heat storage pipe section is provided with a pipe section outlet valve, the heat storage pipe sections are arranged in parallel, and each heat storage pipe section comprises a plurality of solid heat storage modules; the multiple solid heat storage modules are arranged between the pipe section inlet valve and the pipe section outlet valve in series, the inlet pipe section and the outlet pipe section of each heat storage pipe section are each provided with a temperature sensor, the temperature sensors are connected with a temperature flow feedback control unit, and the temperature flow feedback control units are connected with the pipe section inlet valves.

The invention discloses a semiconductor integrated gas path analysis processing method and system and a medium, relates to the technical field of semiconductor special gas, and aims to solve the problem that an integrated gas path analysis method in the prior art cannot adapt to different gas path pressures and gas path flows under the condition that the position of a gas inlet and the position of a gas outlet are fixed. The method comprises the steps of obtaining a gas path schematic diagram; determining the base block size of the gas path assembly based on the gas path flow data and the gas path pressure intensity data; the to-be-compared length is compared with a preset inlet-outlet distance, and if the to-be-compared length is larger than the preset inlet-outlet distance, the gas path corresponding to the to-be-compared length is determined as a to-be-bypassed gas path; on the basis of the assembly sequence, the to-be-bypassed gas path is configured based on the base block size and the preset inlet and outlet distance, the multiple preliminary bypassing schemes are generated, the multiple preliminary bypassing schemes are sequenced according to the sequence of the priorities from high to low, the first scheme sequencing table is obtained, and the gas path configuration efficiency is improved.

The invention provides a rapid structure design method based on a carbon fiber composite material database, which comprises the following steps: disassembling an imported composite material structure model into a basic joint structure and a basic connection structure through an image recognition technology, matching the basic joint structure and the basic connection structure with a composite material basic structure database to obtain composition information of the composite material structure model, the method comprises the following steps: manually inputting a user demand, calling a composite material layering performance library by a system, and matching material performance and a layering structure to a basic joint structure and a basic connection structure of a composite material structure model; and by taking the model structure composition information, the material performance and the layering structure parameters as input ends of machine learning, and taking the user demand as an index of machine learning, a composite material type and a layering structure which meet the user demand are optimized through a machine learning method. According to the method, image recognition, a database and machine learning are integrated, the design process can be simplified, and the design threshold is reduced.

The embodiment of the invention provides a model generation method, a related system and a storage medium. The method can be widely applied to the field of artificial intelligence AI. The method comprises the following steps: determining information of operators or operator cascading, wherein the information comprises at least one of input, output and parameters of the operators; determining the type of a model according to the operator or operator cascade information; and generating a model according to the operator or operator cascade information and the type of the model. By adopting the means, efficient design and automatic generation of the AI network fragment model can be realized.

The invention discloses a dredged sludge full industrial waste residue curing material proportion optimization method and system, and the method comprises the steps: carrying out a proportion test on dredged sludge by adopting cement, mineral powder and desulfurized gypsum according to a volcanic ash, alkali and sulfate synergistic curing mechanism, determining the optimal mixing ratio of each material, and giving chemical component mass ratios of SO3 / Al2O3, CaO / Al2O3 and (CaO + MgO) / SiO2; the method comprises the following steps: investigating industrial waste residues in a dredging engineering preset range, dividing the industrial waste residues into three types: an active base material, an alkali-activated material and a sulfate-activated material, and measuring chemical components of the industrial waste residues; according to the chemical components and the target mass ratio of the chemical components determined by the ratio test, three target functions for optimizing the ratio of the whole industrial waste residue curing material are established; and searching an optimal solution meeting the three objective functions by using an optimization algorithm. The method can solve the problem of proportion change caused by difference of chemical components of industrial waste residues in different regions, the proportion optimization efficiency is greatly improved, and the popularization value is extremely high.

The invention provides a printing method and device of an Excel-based printing template system. The method comprises the following steps: making an Excel template according to a receipt printing template requirement of a unit; carrying out the binding of the Excel template; the Excel template obtains data from a database, data filling is carried out through the Apache POI technology, and a complete Excel file filled with the data is generated; converting the Excel file into an HTML (Hypertext Markup Language) code; matching all bound functions in the HTML code through a regular expression, running corresponding function code blocks, and replacing the bound functions with function running results; according to the printing size configured by the template, a script is embedded in an HTML code, and the scaling is adjusted; and the browser executes the printing operation to complete printing, so that the user can quickly print, and the operation difficulty is reduced.

The invention discloses a coaxial contra-rotating propeller design method and system based on a rapid pneumatic calculation method, and relates to the technical field of aircraft design, and the method comprises the steps: obtaining the layout and parameter design of a coaxial contra-rotating propeller, and determining the blade load distribution in a cruising state through a Goldstein theory; calculating the thickness distribution and chord length distribution of the blades according to the dimensionless spanwise positions of the blades and the diameter of the propeller disc; an airfoil lift coefficient and an airfoil distribution are determined based on these data. The torsion distribution of the blades is calculated through the blade element theory, and the sweepback / sweepback distribution is determined according to pneumatic and structural requirements. A rapid momentum source pneumatic calculation method is used for evaluating whether the pneumatic performance meets the cruise and take-off states or not, and when the pneumatic performance meets the cruise and take-off states, coaxial contra-rotating propeller design is completed; and if not, updating chord length distribution, airfoil profile distribution and torsion distribution of the blades until the design requirements of the cruise and take-off states are met. According to the method, rapid design of the coaxial contra-rotating propeller can be achieved.

The invention relates to the technical field of offshore mooring systems, and discloses a mooring system initial design method based on a catenary equation, which comprises the following steps: determining basic parameters of a mooring system according to a multi-component catenary equation; based on the basic parameters and the central symmetry problem of the floating foundation, mooring parameters, the horizontal offset of the floating platform under different wind wave flow incidence angles, the load borne by the floating wind turbine generator and the value of the horizontal force borne by the top end of a mooring chain are determined; according to the mooring parameters, the horizontal force borne by the top end of the mooring chain and the load borne by the floating type wind turbine generator, horizontal force balance checking is conducted; the maximum offset of the floating platform is verified, if the maximum offset of the floating platform is equal to the allowable maximum offset of the floating platform, the horizontal length of a mooring chain is compared, and if the maximum offset of the floating platform is not equal to the allowable maximum offset of the floating platform, iterative optimization is carried out; and determining parameters for designing the mooring system according to the mooring parameters in the corresponding states when the horizontal length of the mooring chain is maximum so as to establish the mooring system.

The invention provides a rotor punching sheet of a high-efficiency permanent magnet synchronous motor, and relates to the technical field of permanent magnet synchronous motors. The rotor punching sheet provided by the invention is designed according to the following steps: according to symmetry, one pole of the motor rotor punching sheet is designed to be a sector, the unfolding angle of the sector is 180 / p degrees, and p is the number of pole pairs; the center axis of the sector, the boundary straight line and the inner arc line of the motor stator are taken as the reference, the boundary position of the hole is drawn by adopting a geometric construction method, the formed hole is used for inserting the permanent magnet with the rectangular section, and the permanent magnets in the hole have the same specification. According to the invention, serialized high-efficiency permanent magnet rotor punching sheets can be rapidly designed, and the motor cost is reduced; the outer side area of the pole part is small, so that the stress of the rotor reinforcing rib is small; the linear permanent magnets are small in width, so that the flux density of the stator is reduced, and the iron loss of the stator is reduced; the permanent magnets with rectangular cross sections can be inserted into the rotor iron core formed by laminating the punching sheets, so that the manufacturing and mounting cost of the permanent magnets is reduced.

The invention relates to the field of computer information communication, in particular to an automatic process service system and method based on resource application, and the method comprises the following specific steps: a user selects an applied resource type through a selection field in a form, and determines which module enters next according to the selected resource type; each resource application process module has an independent dynamic form, form fields can be automatically adjusted according to different resource types, forms meeting resource application requirements are dynamically generated through a configuration rule engine and a system, and form data are processed and verified; the system controls an access module according to the role authority of the user; in a process execution process, a resource application form submitted by a user passes preliminary auditing, and a system can automatically select an approval module needing to be transferred according to form content.

The invention relates to a desert sand grading cleaning and sewage treatment system which comprises a frame base, a support and three grading cleaning tanks are installed at the top of the frame base, a material guiding inclined plate is installed at the top of each grading cleaning tank, a vibration screening machine frame is installed at the top of the support, and the vibration screening machine frame is designed to conduct vibration screening in the vertical direction. By designing the vibration screening machine frame, related assemblies of the vibration screening machine frame and the sand crushing assembly, during working, the three material guiding inclined plates can receive sand and stone particles of different sizes and grades, and finally the sand and stone particles are conveyed into the three grading cleaning tanks to complete grading cleaning; when the vibrating screening machine frame moves up and down, half teeth drive a rotating rod to rotate back and forth, so that a beating and crushing plate periodically beats the gravel, the caked gravel is beaten and crushed, and then the caked gravel enters three cleaning tanks to be cleaned after being beaten and crushed; the defect that in the prior art, grading and fragmenting operation cannot be completed in the cleaning process is effectively overcome.

The invention relates to an additive manufacturing method of a continuous fiber reinforced composite material, belongs to the technical field of additive manufacturing, and solves the problems that an existing additive manufacturing technology is not suitable for continuous fiber reinforced metal matrix and ceramic matrix composite materials, and the process quality of additive manufacturing of a continuous fiber reinforced resin matrix composite material is poor. An additive manufacturing method of a continuous fiber reinforced composite material comprises the steps that S1, a three-dimensional model of a laminated composite material product is established, slicing treatment is carried out, and each layer of two-dimensional fiber fabric is contained in a corresponding slice; s2, prefabricating a two-dimensional fiber fabric in a layered manner; and S3, additive manufacturing of the laminated composite material product is conducted through a 3D printing forming method. According to the method, rapid additive manufacturing of continuous fiber reinforced ceramic-based, metal-based and resin-based composite materials is achieved, fiber and matrix infiltration in the obtained product is good, the interface bonding strength is high, and compared with a continuous fiber reinforced composite material obtained through an existing method, the continuous fiber reinforced composite material has better process quality and performance.

The invention relates to the field of biotechnology primer design, in particular to a target species specific primer design system, method and device based on information entropy. The system comprises a data acquisition module, a data screening module and a data optimization module, the data screening module is used for acquiring short sequence fragment data with identity and coverage greater than or equal to 80%, and the data optimization module is used for processing the short sequence fragment data with identity and coverage greater than or equal to 80%. According to the method, short sequence fragments covering 90% of genomes are screened out, the entropy value of each basic group in the short sequence fragments is obtained, quantitative scoring is conducted on the short sequence fragments according to the entropy values and coverage degree information, the short sequence fragments with the top scores are screened out, the basic groups are replaced with the most conservative basic groups, and the optimized short sequence fragments are obtained. And designing primers based on the short sequence fragments. According to the system, entropy analysis is introduced in the primer design process, and the design quality and application efficiency of primers are remarkably improved.

The invention relates to a continuous fiber reinforced metal-based composite material and an additive manufacturing method thereof, belongs to the technical field of additive manufacturing, and solves the problems that in the prior art, the continuous fiber reinforced metal-based composite material is difficult to realize 3D printing, and the integrity and consistency of fibers and / or poor infiltration of the fibers and a matrix are / is solved. An additive manufacturing method of a continuous fiber reinforced metal matrix composite comprises the steps that S1, a three-dimensional model of a laminated composite product is established, slicing treatment is conducted, and each layer of two-dimensional fiber fabric is contained in the corresponding slice; s2, prefabricating a two-dimensional fiber fabric in a layered manner; and S3, additive manufacturing of the laminated composite material product is conducted through a selective laser melting forming method. Rapid additive manufacturing of the continuous fiber reinforced metal-based composite material is achieved, fibers in the obtained continuous fiber reinforced metal-based composite material and a product of the continuous fiber reinforced metal-based composite material have good integrity, consistency and stability, infiltration of the fibers and a matrix is good, and the interface bonding strength is high.

This invention provides a method and system for designing complex fracture networks in three-dimensional fracturing of shale oil systems. The method includes: first, identifying the original three-dimensional seepage paths of reservoir samples, including natural fractures and pores, using core observation and microscopic identification. Then, using CT and NMR techniques, the number and morphology of fractures are quantitatively characterized and delineated, forming digital characterization units of the pore-fracture network structure. Next, appropriate fracturing processes are selected based on different original fracture matching relationships, including controlled near-to-far expansion, broadband expansion, and pressurized expansion processes. A CO2-based pre-fracturing acid initiation process is added. Finally, based on optimized and reasonable three-dimensional fracturing parameters for the well group, a refined three-dimensional geological model, a geostress model, and a numerical simulation model of the actual well group are established. This three-dimensional fracturing network design method has advantages such as high accuracy, comprehensive parameters, convenience, and ease of operation.

The utility model relates to the field of filters, and discloses a filter, which comprises a metal shell and a circuit board, a stud is arranged on the inner top surface of the metal shell and is used for mounting and fixing the circuit board and the metal shell; two ends of the circuit board are respectively provided with an input lead and an output lead; the circuit board is divided into a first part and a second part by taking the central axis as a boundary; the first part and the second part of the circuit board are respectively provided with mounting holes close to the middle parts, and are combined with the studs of the metal shell through screws. According to the filter, the filter circuit is arranged on the circuit board, and the functional ground wire on the circuit is connected with the metal shell through the stud and the mounting hole, so that reliable grounding is realized, the process and the structure of the product are simple and attractive, the automation degree is high, and the production is convenient.

The application provides a kind of deep learning optical imaging system design method based on complex function neural network, comprising the following steps: step one, object distance, system focal length, F number as input, according to the ideal optical system imaging relationship, determine image distance, imaging scale ratio;Step two, according to the imaging scale ratio and the object image of ideal optical system, the image of ideal optical system is calculated;Step three, construct complex function generator network model, step four, construct discriminator network model, step five, after the establishment, training of the above-mentioned complex function neural network deep learning model, step six, use phase.The deep learning optical imaging system design method based on complex function neural network provided by the application solves the correlation between the advantages and disadvantages of the design result and the experience value of the designer, without the designer providing initial structure parameters;Greatly improve the computing ability and optimization speed.

This invention relates to the field of power management technology, and particularly to an intelligent integrated power system and control method based on multi-source collaboration, including a main power module, a backup power cluster, an energy management unit, a voltage adaptation module, a status monitoring unit, a communication module, and a load interface. Compared to existing technologies that typically use a single type of battery pack as a backup power source, which suffers from slow response speed and difficulty in withstanding instantaneous high-power surges, this invention employs a heterogeneous energy storage system composed of parallel lithium battery packs and supercapacitor modules as the backup power cluster, and uses a bidirectional DC / DC converter for intelligent control. This solution fully leverages the different advantages of lithium batteries (high energy density) and supercapacitors (high power density and rapid response), enabling the system to provide both long-term backup power support and instantaneous high-power discharge, thereby significantly improving the dynamic response capability, power support reliability, and overall service life of the backup power source.

A magnetic resonance-compatible programmable synchronized photostimulation system includes a main control unit and a stimulation execution unit. The main control unit is located outside the magnetic resonance scanning room, while the stimulation execution unit is located inside the scanning room and consists only of an LED light panel shielded by a magnetic field. The main control unit is configured to: receive photostimulation sequence parameters configured by the user in a modular manner through a graphical interface; receive a scan trigger signal from the magnetic resonance equipment, and automatically control the start and stop of the photostimulation sequence based on the trigger signal using hardware triggering; thereby achieving high-precision time synchronization between photostimulation and magnetic resonance scanning while maintaining magnetic resonance compatibility. This invention solves electromagnetic compatibility issues through a split architecture, achieves millisecond-level synchronization accuracy through hardware TTL triggering, and enhances experimental paradigm flexibility through modular programmable sequences, making it suitable for neuroscience research fields such as functional magnetic resonance imaging.

In order to solve the problem that when the diesel engine belt pump is assembled, a transmission gear can rotate with a pump shaft and cannot be assembled, the gear assembly tool for the marine diesel engine belt pump is designed to guarantee stable and reliable assembly of the transmission gear. The gear assembly tool for the marine diesel engine belt pump comprises a fixing ring with an adjusting screw hole, a gear assembly tool body and a gear assembly tool body, and a screw hole is formed in the fixing ring with the adjusting screw hole; and the adjustable simulation teeth are meshed with the outer teeth of the transmission gear, are arranged on the inner side of the fixed ring with the adjusting screw hole and are assembled in the screw hole of the fixed ring with the adjusting screw hole through a fastening nut.

The application provides a longitudinal-bending coupled vibration ultrasonic scalpel head based on an acoustic black hole, a scalpel and a design method, and belongs to the technical field of medical instruments.The ultrasonic scalpel head comprises, in sequence from the head to the tail, an ultrasonic scalpel head head part, an ultrasonic scalpel head back part, an ultrasonic scalpel head tail part and an ultrasonic scalpel head arc blade part; and the arc structure of the ultrasonic scalpel head arc blade part satisfies a one-dimensional acoustic black hole cross-section height calculation model.The longitudinal-bending coupled vibration mode provides longitudinal shearing force and transverse shearing force for the ultrasonic scalpel head at the same time, the focusing effect of the acoustic black hole structure is utilized to further enhance the mechanical vibration capacity of the ultrasonic scalpel head, and the cutting time of the ultrasonic scalpel head in surgery can be greatly shortened, so that the work efficiency is greatly improved.

The invention provides a sewing machine, a needle bar crank of the sewing machine and a design method of the needle bar crank. The design method comprises the following steps: establishing a dynamic model of the needle bar crank in dynamic simulation software, and establishing a simulated mass center of the needle bar crank; setting a plurality of groups of parameter conditions, adjusting the simulated mass center according to the plurality of groups of parameter conditions in dynamics simulation software, and calculating the inertia force of the needle bar crank to the front bearing seat under different parameter conditions. The inertia force meeting the set condition is selected from the inertia force of the needle bar crank on the front bearing seat under the condition of different parameters, and the needle bar crank is designed according to the parameter condition corresponding to the inertia force. According to the technical scheme, the parameters of the mass center of the needle bar crank are simulated and adjusted through the dynamic simulation software, the parameter conditions enabling the inertia force of the needle bar crank mechanism to meet the set conditions are selected, the optimal needle bar crank can be rapidly designed according to the parameter conditions, then vibration and noise generated when the sewing machine works are weakened and improved, and the working efficiency of the sewing machine is improved. And the motion precision and stability of the sewing machine are improved.

According to the design method of the engine cylinder, the engine cylinder comprises a cylinder body and a cylinder cover, and the cylinder cover is provided with an inlet valve seat ring; a plane which passes through the central axis of the intake valve seat ring and is parallel to the XZ plane is a second plane, and the second plane is provided with a second rotating center; the connecting line of the first rotation center and the second rotation center is a rotation axis, and the projection axis of the projection of the rotation axis on the YZ plane; the included angle between the projection axis and the Y axis is a parameter included angle; the ratio of the Z-axis coordinate of the first rotating center to the inner diameter of the engine cylinder is a parameter ratio; the design method comprises the steps that size parameters of an engine cylinder are adjusted, and a CFD model is used for conducting single-time simulation calculation on the engine cylinder within the range that the crank angle ranges from 360 degrees to 0 degree; obtaining a parameter included angle and a parameter ratio in a single simulation calculation process; whether the parameter included angle is within a set included angle range or not and whether the parameter ratio is within a set ratio range or not are judged, if yes, single-time simulation calculation is stopped, and the single-time simulation calculation is stopped at a set rotating angle P, and Plt is smaller than or equal to-160 degrees; 0 DEG.

The invention provides a nanoparticle, a preparation method and a cancer early screening related application thereof, the nanoparticle comprises a superparamagnetic nano core, a cationic polymer modified on the surface of the superparamagnetic nano core and a targeting polypeptide grafted on the cationic polymer, the targeting polypeptide can specifically recognize a tumor specific antigen protein, and has a modular structure comprising a rigid helix and a charge repulsion sequence. The plasma low-abundance protein-enriched nanoparticles provided by the invention can be used for early screening detection of tumors through liquid biopsy, can significantly improve the detection rate of early tumors, and have important clinical significance.