38results about How to "Efficient calculation method" patented technology

The invention provides an axis-invariant-based multi-axis robot inverse kinematics modeling and solving method. The method is implemented based on the fixed axis invariant D-H system and D-H parameterdetermination principle, the Ju-Gibbs quaternion and quasi direction cosine matrix principle, the axis invariant general 6R mechanical arm inverse solution principle and the axis invariant general 7Rmechanical arm inverse solution principle. The principles have the characteristics of being general, convenient and accurate and can be set into circuits and codes and be executed directly or indirectly and partially or totally in a multi-axis robot system. Besides, an analysis and verification system established based on the principles is also included and used for designing and verifying the multi-axis robot system.

The invention relates to an on-vehicle road grade recognition device based on a low-cost acceleration transducer and a method thereof, belonging to the technical field of automotive electronics. The device comprises an on-vehicle embedded computer with two serial ports, as well as an acceleration module and a vehicle speed module respectively connected with the on-vehicle embedded computer. The acceleration module is composed of an acceleration transducer, an analog-digital conversion module and a singlechip. The method comprises the following steps: acceleration data and vehicle speed data are read in sequence; the obtained acceleration data is averagely processed and then taken as the present transducer acceleration; the motion acceleration of a last moment is obtained by calculation according to the present vehicle speed and the vehicle speed of a last moment; and the road grade is obtained by calculation according to the transducer acceleration of a last moment and the motion acceleration of a last moment and taken as the presently recognized road grade value. By adopting the low-cost acceleration transducer, the device and the method are characterized by low cost, small volume, convenient installation, and the like.

The invention discloses a population distribution calculation method. The method includes: firstly, preprocessing a mobile phone base station and on-line population distribution thermodynamic map datain a research area, wherein the Tyson polygon set is established for the base station data of the mobile phone, which is denoted by S; capturing the original point data of the online population distribution thermodynamic map of the corresponding area, and generating the grid data of the population distribution density by using the kernel density method, which is recorded as Z; secondly, finding the corresponding maximum points of online population distribution thermodynamic map for each plot in set S; and then forming a maximum point data set M; Finally, a new population thermodynamic map isgenerated by using the point data set M and the point kernel density algorithm. The invention integrates the characteristics of online population distribution thermodynamic map and mobile phone signaling data, can utilize different types of population thermodynamic map data to improve the accuracy of population distribution calculation, and provides decision basis for urban planning and traffic management.

The present invention belongs to the technical field of non-destructive testing of concrete beams, and discloses a non-destructive testing system and method for pre-stressed concrete beams. The non-destructive testing system comprises: a pre-stress acquisition module, a strength detecting module, an anti-seepage detecting module, a main control module, a crack resistance testing module, and a pre-stress simulation module, a data storage module, and a display module. The method is characterized in that: identification and intelligent analysis are performed on the strength of the concrete through the strength detecting module, and the strength of the concrete structure can be accurately determined; and the pre-stressed tendon and the concrete unit are separately established by the pre-stresssimulation module, so that only specifying the pre-stressing force, the cross section area, the linear expansion coefficient and the elasticity modulus of the pre-stressed tendon can calculate the cooling value applied to the pre-stressed tendon. According to the method provided by the present invention, the actual effect of the pre-stressed tendon is considered, and the pre-stressing effect canbe effectively simulated; and in the complex pre-stressed concrete structure, only the cooling value of the pre-stressed tendon needs to be calculated, and the calculation result is accurate and the calculation method is efficient.

The invention relates to a finite difference method of a fine simulation tubular well structure. The finite difference method of the fine simulation tubular well structure comprises the steps of: firstly performing finite difference grid division on a well computation space based on a research need and establishing a finite difference relationship of water balance on grid nodes; then performing value assignment of hydrogeological parameters on a ground layer where the well locates based on a practical project, setting a known water-head border or fixed water-head border and a water-isolating border at a well filter pipe to distinguish a well wall, a filter pipe hole, a filter pipe surrounding stuffing and a practical ground surface; then establishing a linear equation group of the water balance based on an underground water three-dimensional unsteady flow equation; and finally solving the equation through Gauss-Seide iteration to obtain water-head values of nodes. The finite difference method of the fine simulation tubular well structure, disclosed by the invention, has the advantages of being simple and efficient, and is suitable for finite difference value simulation design of any well fine structure.

The invention discloses a vehicle-mounted road slope identification device based on an embedded system. The vehicle-mounted road slope identification device is characterized by comprising a vehicle-mounted embedded computer with three serial ports, an acceleration module connected with the vehicle-mounted embedded computer through a first serial port, a vehicle speed module connected with the vehicle-mounted embedded computer through a second serial port, and a timer connected with the vehicle-mounted embedded computer through a third serial port, wherein the acceleration module consists of an acceleration sensor, an analog/digital conversion module and a singlechip; the output end of the acceleration sensor is connected with the singlechip through the analog/digital conversion module; the singlechip is connected with the input end of the embedded computer through the serial port; a power supply module supplies power to each module through a vehicle-mounted power supply.

The invention provides an irregular object volume measurement method and system based on point cloud data, and the method comprises the steps: projecting the information of the point cloud data of a measured irregular object to a Z axis of a space system, determining a probability density function on the Z axis, determining a curvature function on the Z-axis projection, and calculating the curvature of each point on the Z-axis projection through the curvature function; according to the curvature of each point, the set reference spacing, the reference curvature and the relative spacing coefficient, determining a list of optimal lengths of spacing between adjacent slices on the z axis; slicing the point cloud according to the list to sequentially obtain a z-axis direction point holder body; carrying out boundary detection on the cross section of each slice, and calculating the cross section area of each point cloud slice; and determining the volume of each table body according to the cross section area of each point cloud slice and the height of each table body, and adding all table bodies to obtain the final volume of the measured irregular object. The method and system are simple in measuring process, reliable in result, efficient and controllable in precision.

The invention discloses a compressed sensing-based image signal acquisition method. The method comprises the steps of receiving an analog image signal x(t), sampling the analog image signal x(t), andacquiring a sampled discrete signal yi(n) of an i path; according to the analog image signal x(t) and the discrete signal yi(n), acquiring a fourier transform function X(Omega) of x(t), a discrete fourier transform function Yi(Omega) of yi(n), an ideal sensing matrix H(Omega) and an original signal R(Omega); calculating a unique sparse solution of the original signal R(Omega) according to the ideal sensing matrix H(Omega); and reconstructing the sampled analog image signal and the discrete signal according to the unique sparse solution of the original signal R(Omega). Through adoption of the method, the sparse signal can be obtained efficiently, each signal channel is matched, and zero overflow is realized; sampling and reconstruction errors of the sparse signal in the prior art are overcome and are corrected accurately; and compressed sensing prevents impact on the whole system.

The invention relates to a method for calculating the area of a building window, and the method comprises the following steps: selecting a window in a building as a calibration window, and performing measuring to obtain the size information of the calibration window; photographing the building by using the unmanned aerial vehicle to obtain a building image; establishing a three-dimensional live-action model by utilizing the building image; intercepting a vertical view of the three-dimensional live-action model to obtain a screenshot image as training data; obtaining a window object detection model through training data training based on an EsyDL platform; obtaining a vertical view of the three-dimensional live-action model as a calculation image; intercepting a calibration window in the three-dimensional live-action model to obtain a calibration image; attaching the calibration image to the edge of the calculation image, and inputting the calibration image into a window object detection model to perform window object detection to obtain all detection windows; and calculating the areas of all detection windows by using the calibration window size information, so the building window area is obtained. According to the building window area calculation method, automatic calculation is achieved, labor is saved, and the calculation efficiency and the calculation precision can be improved.

A convolutional neural network character recognition method running on an ARM comprises the steps that all weight layers of a neural network are quantized into n-th power of 2, and all active layers are quantized into 8-bit signed integers; during calculation of the neural network, all multiplication operations can be replaced by shift operations, the advantage of high efficiency of bit operationsof an ARM processor is fully played, the defect of long time consumption of ARM floating point operations is overcome, and complex neural network calculation can be deployed on embedded equipment with low operational capability and low power consumption.

The invention discloses a multi-level quantifiable calculation method for comprehensive ability analysis of preschool children. The multi-level quantifiable calculation method comprises the steps of obtaining a question list in a test process; obtaining test questions from the question list, and identifying the test questions as test questions; querying a target capability list and a number corresponding to the test question; obtaining the investigation capability from the target capability list, and identifying the investigation capability as the investigation capability; loading sub-capability items contained in the capability according to the serial number and the investigation capability, and calculating a score value; dynamically loading a sub-capability module, executing a scoring function and storing a result into a sub-capability list; calculating quantitative scores of all the sub-capabilities according to the sub-capability list; setting a corresponding score on the memory tree according to the calculated score and the capability ID; and reconstructing the score of the memory tree to obtain an updated scoring result.

The invention discloses a prestress equivalent simulation method in finite element analysis of a complex prestressed concrete structure in the field of water conservancy and hydropower engineering. The prestress equivalent simulation method comprises the following steps of establishing a concrete structure unit according to structure arrangement and size; establishing pre-stressed tendon units according to the specifications and sizes of pre-stressed tendons configured in the concrete structure; applying the cooling value to the prestressed tendon unit, so that the shrinkage force generated byshrinkage of the prestressed tendon is used for simulating the pre-pressing stress of the prestressed tendon on the concrete. The beneficial effects of the invention are as follows the prestressed tendons and concrete units are established respectively; only the prestressing force of the prestressed tendons, the cross-section area, the linear dilatation coefficient and the elasticity modulus needto be clear, so that the actual effect of the prestressed tendons is considered, the prestressed effect can be effectively simulated, only the cooling value of the prestressed tendons needs to be calculated in a complex prestressed concrete structure, the calculation result is accurate, and the calculation method is efficient.

The invention provides an axis type centrifugal ventilator resistance calculation method which comprises the following steps: determining the arrangement of aperture units of an axis type centrifugalventilator according to the structural form of the axis type centrifugal ventilator and the airflow direction of airflow passing through the axis type centrifugal ventilator, and constructing a resistance characteristic unit network framework; determining parameter values of the corresponding resistance characteristic units according to the structure parameters and the operation parameters of theresistance characteristic units, wherein the working environment of the axis type centrifugal ventilator is determined; and calculating the resistance of the aperture units and the overall resistanceof the axis type centrifugal ventilator with the plurality of aperture units according to the parameter values in the working environment. According to the method provided by the invention, the resistance theoretical expression of the axis type centrifugal ventilator can be directly obtained through network architecture construction according to the structural characteristics and sizes of the axistype centrifugal ventilator, and the calculation method is simple, efficient and suitable for resistance calculation under all working conditions.

The invention discloses a block chain-based secret image sharing and recovery method, which comprises two parts of sharing and recovery of a secret image, and is characterized in that: 1) the secret image generates a group of shadow images, and the shadow images are sent to corresponding users; 2) partitioning each shadow image, and encrypting each image block; and 3) uploading the encrypted shadow image to an IPFS (Internet Protocol File System) and a block chain. The recovery comprises the following steps: 1) a certain user sends a recovery application to the smart contract; 2) the smart contract broadcasts a recovery application event to other users; 3) the secret image sharer selectively authorizes the access right to the smart contract; 4) the smart contract issues a recovery task to the block chain; 5) selecting an agent mining machine by the intelligent contract; (6) the proxy mining machine recovers the secret image in the ciphertext domain, and an encrypted secret image is obtained; and 7) the intelligent contract forwards the encrypted secret image to the application user for decryption. According to the method, the problems of stealing, tampering and losing of the shadow image can be completely prevented.

The invention relates to a method for speculating the polymer lithium ion battery AC internal resistance. The AC internal resistance of the polymer lithium ion battery is set as the sum of the internal resistance of the positive and negative foils and the electrochemical internal resistance; an equivalent graph formed by a right triangle A, a parallelogram B and a right triangle C which are sequentially connected is built in the foil internal resistance; the internal resistance of the right triangle A part is shown in the description, the area of the right triangle C and the area of the righttriangle A are equal, and the internal resistance values are equal RC=RA; the internal resistance of the parallelogram B part is shown in the description, the internal resistance of the foil is R0=2*RA +RB; the calculation of the electrochemical internal resistance value can be carried out according to the Rct constant = Rct*S, and then the coating amount M is corrected, the electrochemical internal resistance formula is shown in the description, and the calculation formula of the AC internal resistance value of the polymer lithium ion battery is expressed as R=R0 positive + R0 negative + Rct.The method has the beneficial effects that the calculation method obtains the internal resistance value close to the actually measured value, the research on the mechanism performance of the lithiumion battery is facilitated, and more support is provided for the design of the battery.

A frame building structure anti-seismic optimization design method considering multiple randomness comprises the steps that sensitivity formulas of structure dynamic reliability to random variable distribution parameters and deterministic variables are derived respectively based on a direct probability integral method, and an efficient and accurate analysis method for dynamic reliability sensitivity is provided; a framework building structure parameter optimization design framework is constructed by taking building structure construction cost as a target function and dynamic reliability as a constraint function, and optimization problem solving is carried out based on a dynamic reliability sensitivity analysis method and a moving asymptote method provided by the invention. Compared with a traditional building structure design scheme, the method has the advantages that near-fault seismic oscillation random excitation possibly suffered by the frame building structure and randomness of parameters of the structure are considered, and the design scheme of the frame building structure considering safety and economical efficiency is provided.

The invention relates to a method for calculating the octane number loss in a gasoline catalytic cracking process. The method comprises the following steps of collecting the historical operation parameters of a gasoline catalytic cracking device; and substituting the historical operation data of the catalytic cracking device into a calculation formula, and calculating to obtain the octane number loss in the gasoline catalytic cracking process. According to the method, the octane number in the operation process of the catalytic cracking gasoline device can be effectively analyzed, the problems that an existing octane number monitoring device is unstable and cannot meet the actual requirements are solved, the calculated octane number loss is more accurate, the calculation method is more efficient, and a guidance basis is provided for the real-time monitoring of the octane number loss in the gasoline catalytic cracking process.

The invention relates to the field of wind power generation, in particular to a blade power-increasing trailing edge flap design method, which comprises the following steps of: calculating corresponding average operation attack angles, optimal pitch angles and stress distribution of each section of a blade at different wind speeds lower than a rated wind speed; flap parameters are added to the blade airfoil, and the optimal flap parameters are judged based on the judgment basis including the average operation attack angle and the optimal pitch angle; for the airfoil profile with the optimal flap parameters, modeling and adding groove parameters, and carrying out simulation calculation to obtain optimal groove parameters; and for the airfoil profile with the optimal groove parameters, the flap mounting position meeting the safety requirement is determined based on the stress distribution. For the airfoil main body with the relative thickness of 16-25%, close to the blade tip area, of the outer side of the blade in the spanwise direction, the lift coefficient and the lift-drag ratio of the airfoil main body can be well improved, and the good power increasing and noise reducing effects are achieved.

The invention relates to a calculation method for predicting the length and position of a sea ditch formed by interaction of a flexible or steel catenary riser and a seabed soil body. Before dynamic analysis is carried out, relevant parameters of the sea ditch are determined and added into finite element software, then overall dynamic analysis is carried out, a large amount of time can be saved, meanwhile, the influence of the sea ditch on the fatigue life of the catenary riser is fully considered, and the accuracy of evaluation of the fatigue life of the catenary riser is improved.