39results about "Digital differential analysers" patented technology

A system and method are used to maintain a variance in feedback factors of an amplifier between the first and second phases either below a threshold value or within a specified range. The system includes the amplifier and first through third capacitances. The amplifier is coupled between an input node and an output node that operates during first and second phases of operation. The first capacitance is coupled across the amplifier and between the input node and the output node during the first and second phases of operation. The second capacitance is coupled to the input node during the first phase of operation. The third capacitance is coupled to one of the input and output nodes during one or both of the first and second phases of operation.

The invention relates to the technical field of new energy power generation, and discloses a generating capacity calculation method and system based on wind and light resources and equipment data. The method comprises the following steps: acquiring and fusing wind and light resource data and equipment performance parameters to construct a standardized data set; based on the data set, a resource-equipment dynamic coupling potential field is established, and the potential field accurately represents the comprehensive power generation potential in the space-time dimension by fusing the resource space gradient and the equipment response characteristics; carrying out triple integral calculation on the potential field, and controlling an error by adopting a self-adaptive algorithm; and finally, realizing self-calibration of the system through model verification and parameter optimization. According to the method, the defects of insufficient data fusion, model staticization, contradiction between calculation precision and efficiency and the like of a traditional method are overcome, and the accuracy, the adaptive capacity and the engineering practical value of generating capacity calculation are remarkably improved.

The invention discloses a difference calculation circuit, a memory device including the same, and an operation method of the memory device. The memory device may include a format conversion circuit configured to generate a plurality of differential weights based on a plurality of weights provided from an external device; a memory cell array configured to store a first input element provided from an external device and the plurality of differential weights; a quantization circuit configured to generate a plurality of scaling coefficients based on the plurality of differential weights; and an input element scaling circuit configured to provide a plurality of output elements to an external device based on the plurality of scaling coefficients, the plurality of output elements corresponding to a product of the first input element and each of the plurality of weights.

The invention belongs to the technical field of synchronous control, and particularly relates to a synchronous control system and method for vibration suppression and quality monitoring of twisted pairs, and the method comprises the following steps: S1, obtaining the measurement data of an acceleration sensor and a laser displacement sensor array on a twisted pair production line, a real-time vibration vector field of the twisted pair in the monitoring area is constructed through data fusion; based on the real-time vibration vector field, utilizing a Hamiltonian agent model to predict the vibration energy state of the twisted pair in a future prediction time window; and S2, adjusting a weight coefficient for minimizing the weighted sum of the predicted vibration energy and the control increment norm in real time according to the twisting quality characteristic index calculated in the previous control period. According to the method, conversion from passive response to active predictive suppression is realized, optimal control measures can be taken before vibration deterioration, and the timeliness of vibration suppression is improved.

The present disclosure relates to the technical field of automatic differentiation, including an automatic differentiation method of parallelized reverse mode, a storage medium and a product. In an automatic differentiation conversion process on a source program, a tensor tape corresponding to each reading position of a declared intermediate variable is generated to generate a forward propagation program and a backward propagation program based on the tensor tape; if the reading position belongs to a first loop structure in the source program, the shape of the tensor tape is determined based on the loop boundary of the first loop structure, and the stored intermediate value is indexed by the loop variable of the first loop structure; this makes the data retrieval in the backward propagation process no longer dependent on the execution order of the control flow of the forward propagation of the program, and on this basis, a second loop structure in the backward propagation program can be subjected to loop transformation, and then a target program executable by a processor is generated; the problem of parallel conflict naturally introduced by automatic differentiation is solved by rewriting the backward propagation program, parallel resources are fully utilized, and parallel efficiency is improved.

The application discloses a physical enhancement-based fluid dynamics small sample solving method, including: acquiring sparse fluid observation data in a complex geometric calculation domain, and mapping the observation data to a statistical average flow space described by a Reynolds-averaged Navier-Stokes equation; constructing a neural network model for predicting an average velocity field, an average pressure field and a spatially continuous and learnable eddy viscosity coefficient latent field; when calculating spatial derivatives in the Reynolds-averaged Navier-Stokes equation, a differentiable spectral operator module is used to replace a traditional automatic differentiation mechanism; based on geometric distance information of each spatial point in the calculation domain to a solid boundary, a geometry-aware mask is constructed; the mask is used to distinguish the calculation domain into a near-wall shear dominated region and a main flow region; a joint loss function containing a data term and a physical residual term is constructed, and the physical residual term is preconditioned; and a prediction result is output; the application realizes numerical stability and high prediction accuracy.

The invention relates to the technical field of hydrological sediment monitoring, and discloses a sediment content calculation method, which comprises the following steps: acquiring a single-point flow velocity vector, a single-point original sediment content and a total water depth of a measuring point; constructing a non-constant inertia index combining the flow velocity change rate and the single-point flow velocity modulus; determining a dynamic lag time window by using a non-constant inertia index and acquiring a reference sand content; calculating a vertical density gradient and a gradient Richardson number by using the reference sand content, and determining a turbulence suppression factor; respectively correcting a vertical flow velocity distribution function and a sand content distribution function by using a turbulence suppression factor and a non-constant inertia index, and constructing a vertical flow velocity distribution data column and a sand content distribution data column through iterative calculation; and integrating to obtain the single-width sediment transport modulus. According to the method, sediment response lag is corrected by introducing a non-constant inertia index and a dynamic lag time window, the damping effect of density stratification on turbulent flow is quantified by using a turbulent flow suppression factor, and the full-water deep-water sediment structure under the non-constant flow condition is accurately inverted by using single-point data.

The invention provides a method for calculating sound and vibration characteristics of a multi-section rotary shell under light fluid, which comprises the following steps of: splitting the multi-section rotary shell into a conical section with a linear generatrix and a hyperbolic section with a nonlinear generatrix according to curvature change characteristics of a meridian line of the shell, and generating node distribution meeting differential quadrature operation in each section; a control equation of the shell is established based on the first-order shear deformation theory, boundary conditions are simulated through an artificial spring, force and displacement continuity of multiple sections of joints is processed, free vibration and forced vibration characteristics are solved through a differential quadrature algorithm, and global speed response is obtained; a fitting unit radiation superposition method is adopted to enable the surface of a shell to be equivalent to an acoustic baffle, a cylindrical surface or a spherical crown surface is adopted to fit and calculate a sound transmission vector according to the type of the shell, and far-field sound radiation characteristics under light fluid are solved in combination with global speed response. The sound and vibration characteristic analysis method provided by the invention has high efficiency, universality and good engineering practicability on the premise of ensuring the calculation precision.

The invention discloses a switch hand feeling multi-scale modeling method based on a physical information neural network, and the method comprises the steps: firstly building a one-dimensional nonlinear elastic damping partial differential equation PDE and an ordinary differential equation ODE which describe the overall deformation behavior of a key, and forming a hybrid PDE-ODE kinetic model; secondly, according to the dynamic model, designing a Bayesian physical information neural network B-PINN with an uncertainty quantification capability; and then the data sampling density is dynamically improved in a mutation region, training weight distribution is adjusted by adopting an event-driven strategy, and the adaptive training capability of the neural network B-PINN is enhanced. And finally, generating an elastic modulus and damping coefficient probability distribution map by using the trained network model, mapping the subjective hand feeling score of the user into a mechanical objective function, and inverting parameters. According to the method, the defects of poor generalization and insufficient physical consistency of a pure data driving method are overcome, and the reliability of switch design parameters is improved.

The application discloses a gravity data downward continuation method based on a discrete model of a reverse band-limit Poisson integral, equipment, a medium and a product, relates to the technical field of gravity data processing, and performs gridization on discrete gravity point data, determines a grid limit frequency, a truncation order of grid gravity anomaly data and a type of a discrete model of a reverse band-limit Poisson integral, and when a direct discrete model in a removal recovery mode is removed, determines a coefficient matrix, a parameter vector and a constant vector based on the grid gravity anomaly data, a continuation height and an earth gravity field model; determines a target calculation formula based on the coefficient matrix, the parameter vector and the constant vector; when an indirect discrete model in a near-zone integral mode is removed, determines a target calculation formula of the discrete model based on the grid gravity anomaly data and the continuation height; and obtains a downward continuation result based on the target calculation formula of the discrete model. The application can stably and highly accurately perform downward continuation on gravity data.

The invention discloses a space-time fence early warning method and device based on a vehicle position, a vehicle and a medium, and relates to the technical field of vehicles. The method comprises the following steps: acquiring the current position of a vehicle and associated space-time fence information; when it is determined that the space-time fence where the vehicle is located currently is not switched according to the current position of the vehicle and the associated space-time fence information, the current activity duration of the vehicle is accumulated; and controlling the vehicle to give an alarm under the condition that the current activity duration of the vehicle is greater than or equal to a preset activity duration threshold value corresponding to the space-time fence where the vehicle is currently located. Thus, the problems that an existing electronic fence system cannot continuously track the duration of the vehicle in the fence, the dynamic space-time rule is difficult to support, and a rule engine is rigid are effectively solved, precise monitoring and self-adaptive early warning of the continuous state of the vehicle behavior are achieved, and the real-time performance, flexibility and service adaptability of vehicle supervision are improved.

The embodiment of the application discloses a high-pass filter electromagnetic transient modeling method and device and electronic equipment, which can quickly, conveniently and accurately perform electromagnetic transient modeling on the high-pass filter, and is beneficial to electromagnetic transient simulation of a power system. The method comprises the following steps: firstly, determining a frequency domain model of the high-pass filter according to the high-pass filter; secondly, obtaining a time-domain integral model of the high-pass filter in a time period according to Laplace inverse transformation and the frequency domain model of the high-pass filter; and finally, obtaining a segmented time-domain electromagnetic transient model of the high-pass filter according to the trapezoidal rule and the time-domain integral model of the high-pass filter in the time period.

The invention provides a vibration system equivalent dynamic modeling method based on a steel wire rope catenary effect, and belongs to the technical field of dynamic simulation, and the method comprises the steps: discretizing a steel wire rope into a plurality of mass points distributed in the length direction of the steel wire rope, and connecting the adjacent mass points through spring damping force elements, constructing a dynamic model of the vibration system; performing a virtual test based on the dynamic model to obtain equivalent stiffness and equivalent mass of the vibration system at different travel positions of the trailer wagon; according to the relation between the equivalent stiffness and the travel of the trailer wagon and the relation between the equivalent mass and the travel of the trailer wagon, an equivalent model of the vibration system is established, and the equivalent model is a single-degree-of-freedom vibration system with the equivalent stiffness and the equivalent mass changing along with the travel. According to the invention, the efficiency of dynamics simulation control and the accuracy of simulation analysis are improved.

The embodiment of the utility model discloses a phase-locked control device, a phase-locked loop and a power grid system. The control device comprises a first branch used for generating a first output signal with the same phase as a first input signal, a second branch used for generating a second output signal orthogonal to the first input signal, a third branch used for extracting a third output signal in the first input signal, and a phase lock control module. The first input signal is an alternating current signal of a target phase-locked signal, and the third output signal is a direct current component in the first input signal; and the phase-locked control module is used for determining a target phase-locked phase angle by using the first output signal, the second output signal and the third output signal, and controlling the to-be-controlled phase-locked loop by using the target phase-locked phase angle. According to the utility model, the technical problems of phase locking control lag, slow response speed and low phase locking precision caused by dependence on symmetry of signals in a period or dependence on accuracy of parameter selection of a filter in a phase locking process are solved.

This invention relates to the field of magnetic pole topology design, and more particularly to a method for designing the magnetic pole topology of a finite-angle torque electromagnetic drive. The method includes: meshing the rotor back iron, air gap, and stator domain of a finite-angle torque motor; defining permanent magnet material variables and soft magnetic material variables; based on the material variables, performing filtering, projection, and constitutive equation electromagnetic field mapping through an electromagnetic field finite element model to generate mapped material variables and torque variables; constructing constraints and an objective function; and solving the magnetic field strength characterization variables of the objective function using an optimization solver to determine the optimal combination of the corresponding permanent magnet material variables and soft magnetic material variables. This invention transforms the distribution problem of permanent magnets and soft magnetic materials in the rotor back iron into a topology optimization problem, achieving a high-performance combination of permanent and soft magnetic materials, improving the material utilization rate and torque density of both permanent and soft magnets, and realizing high material utilization of the rotor back iron of a finite-angle torque motor.

The application discloses a kind of fine modeling methods for single-shaft gas turbine gas path system, including establishing single-shaft gas turbine gas path system's step-by-step compression compressor module, establishing single-shaft gas turbine gas path system's combustion chamber module, establishing single-shaft gas turbine gas path system's step-by-step expansion turbine module, based on the calculation method of compressor module outlet temperature, power consumption, the calculation method of each component mass, temperature of combustion chamber module outlet and the calculation method of turbine module outlet temperature, power, using Python simulation platform establishes single-shaft gas turbine gas path system model, obtains rated operating condition and actual operation data, the data of rated operating condition is input into the single-shaft gas turbine gas path system model built, and the dynamic characteristics of gas turbine are analyzed;It aims at solving the problem of insufficient accuracy caused by neglecting the change of specific heat capacity with temperature and the evolution of combustion product composition in the existing model.

The invention discloses a double-reflector antenna electromechanical coupling rapid analysis method and system, and aims to reconstruct a physical optical integral expression. Dispersing the reflecting surface into triangular grids, and performing linear fitting on amplitude and phase functions in each grid; an equivalent wave number / wavelength concept is introduced, a phase fitting error is analyzed, a differentiated grid processing strategy is put forward, a closed expression for calculating a far-field directional diagram is deduced through affine transformation and partial integration, and numerical integration is replaced by analytical calculation; and converting the structural deformation into an additional phase error, and integrating the additional phase error into a rapid calculation framework. The method breaks through the limitation of the traditional electromagnetic analysis on the grid size, greatly improves the electromechanical coupling analysis speed on the premise of guaranteeing the precision, and provides an efficient tool for the design and profile compensation of a high-frequency-band antenna.

The invention relates to the technical field of centrifugal pumps, in particular to a centrifugal pump blade wrap angle determining method based on hydromechanics numerical integration. The centrifugal pump blade wrap angle determining method is a numerical integration method based on a fluid mechanics equation, equal-interval point division is conducted on a shaft surface streamline in an impeller shaft surface projection drawing through combination of a differential equation and numerical integration, and the arc length and the radius between every two adjacent equal division points are calculated; after the axial surface fluid velocity vm is calculated based on the one-dimensional flow theory, a curve of vm changing along an axial surface streamline is drawn; establishing a linear distribution model of the tangential velocity moment vur according to an Euler equation; after the integral coefficient K is calculated, K.si accumulated integral is calculated point by point, the centrifugal pump blade wrap angle value is directly obtained, and the effectiveness of the centrifugal pump blade wrap angle value is obtained through verification with an example verification method; according to the method, the centrifugal pump blade wrap angle can be designed through parameterization, and the situation that the centrifugal pump blade wrap angle can only be obtained depending on experience is avoided.

The invention relates to the technical field of lightning current measurement, in particular to a large-span tall tower lightning current measurement and inversion method based on Gaussian integral. According to the technical scheme, the method comprises the steps that a rectangular plane coordinate system is established with the center O of the cross section of a platform at the middle section height of a target measurement tower as the origin of coordinates, rectangular vertexes A, B, C and D are defined, AB and CD are long sides, and AD and BC are short sides; n tunnel magnetoresistive sensors are installed on a rectangular loop path to form a rectangular sensor array Z, and n is an integer and is larger than or equal to 12 and smaller than or equal to 16. According to the lightning current measurement inversion method based on the Gaussian-Legendre integral algorithm, measurement can be carried out for different lightning currents, the influence that an external interference magnetic field and a circular array cannot be suitable for actual environment installation of a tower can be reduced, and the measurement accuracy is improved.

A memory device according various example embodiments may comprise a format conversion circuit configured to generate a plurality of differential weights based on a plurality of weights provided from an external device, a memory cell array configured to store a first input element provided from the external device and the plurality of differential weights, a quantization circuit configured to generate a plurality of scale coefficients based on the plurality of differential weights, and an input element scaling circuit configured to provide a plurality of output elements corresponding to products of the first input element and each of the plurality of weights to the external device based on the plurality of scale coefficients.

This invention discloses a method for synergistic optimization of soil structure and fertility based on straw return to the field to promote decomposition, belonging to the field of soil optimization technology. A systematic technical system is constructed from the dimensions of in-situ straw decomposition and compost humification enhancement. Highly efficient decomposition-promoting microorganisms and humification promoters are screened through indoor cultivation experiments. The regulatory mechanism of decomposition promoters on the compost humification process is analyzed using humification kinetic models and structural equation models, forming a compost humification enhancement technology. Key parameters affecting in-situ straw decomposition are screened using the nylon mesh bag method. Multiple physical, chemical, and biological indicators of the soil are measured through years of field experiments. A comprehensive scoring model is constructed using principal component analysis, combined with multi-factor variance analysis and multiple comparisons, to screen the treatment combination with the highest contribution rate to the synergistic improvement of soil structure and fertility. Technical procedures are formulated and demonstrated. This achieves synergistic fertilization of the topsoil and sub-topsoil of degraded soils, with significant economic, ecological, and social benefits.

The application relates to the technical field of new energy power generation, and discloses a power generation capacity calculation method and system based on wind and light resources and equipment data. The application collects and fuses wind and light resource data and equipment performance parameters to construct a standardized data set; based on the data set, a resource-equipment dynamic coupling potential field is established, the potential field accurately represents the comprehensive power generation potential in the time and space dimensions by fusing resource space gradients and equipment response characteristics; then, triple integral calculation is carried out on the potential field, and an adaptive algorithm is used to control errors; finally, model verification and parameter optimization are carried out to realize self-calibration of the system. The application overcomes the defects of the traditional method, such as insufficient data fusion, static model, contradiction between calculation accuracy and efficiency, and the like, and significantly improves the accuracy, adaptive capacity and engineering practical value of the power generation capacity calculation.

The invention belongs to the field of circuit design technology and application, and particularly relates to a neural network circuit containing a homogeneous ReLU activation function, which comprises three integral channels which have the same structure and are mutually coupled, and is characterized in that each integral channel comprises an integral unit consisting of an input resistance network, an integral capacitor and an operational amplifier, the output end of each integral channel is connected with a reverse ReLU function implementation circuit; the three integral channels receive direct current excitation signals and alternating current excitation signals introduced through an external input end respectively, output signals of all the channels are input to other channels respectively, and dynamic feedback coupling among multiple channels is achieved. The reverse ReLU function implementation circuit comprises a one-way limiting unit composed of an operational amplifier and a diode, and is used for carrying out reverse ReLU nonlinear processing on an input signal. The circuit provided by the invention is simple in structure, the number of circuit elements is reduced by more than five percent compared with a traditional homogeneous Tanh activation function neural network circuit, and the whole circuit is low in manufacturing cost and convenient to integrate.

The present application relates to the technical field of centrifugal pump, in particular to a centrifugal pump blade wrap angle determination method based on fluid mechanics numerical integration. The centrifugal pump blade wrap angle determination method is a numerical integration method based on fluid mechanics equation. By combining differential equation and numerical integration, equidistant points are divided on the axial surface streamline in the axial surface projection diagram, and the arc length and radius between each adjacent two equidistant points are calculated. Based on one-dimensional flow theory, the axial surface fluid velocity v m is calculated m , and a curve changing along the axial surface streamline is drawn. According to Euler equation, a linear distribution model of tangential velocity moment v u r is established. After calculating the integral coefficient K, K·△s i is calculated point by point, and the integral is accumulated to directly obtain the centrifugal pump blade wrap angle value. The effectiveness of the centrifugal pump blade wrap angle value is verified by using an example verification method. The present application can realize the design of the centrifugal pump blade wrap angle through parameterization, and get rid of the condition that the centrifugal pump blade wrap angle can only be obtained by relying on experience.

The invention discloses a gravity data downward continuation method, device, medium and product of a discretization model based on inverted band limit Poisson integral, and relates to the technical field of gravity data processing, gridding is carried out on discrete gravity point data, and grid limit frequency, the truncation order of grid gravity abnormal data and the type of the discretization model of the inverted band limit Poisson integral are determined; when a direct discretization model in a recovery mode is removed, a coefficient matrix, a parameter vector and a constant vector are determined based on grid gravity abnormal data, continuation height and an earth gravity field model; determining a target calculation formula based on the coefficient matrix, the parameter vector and the constant vector; when the model is an indirect discretization model in a near-region integration mode, determining a target calculation formula of the discretization model based on the grid gravity anomaly data and the continuation height; and obtaining a downward continuation result based on a target calculation formula of the discretization model. According to the invention, stable and high-precision downward continuation can be carried out on the gravity data.

The invention relates to the field of magnetic pole topology design, in particular to a finite angle torque electromagnetic drive magnetic pole topology design method, which comprises the following steps of: performing mesh generation on rotor back iron, an air gap and a stator domain of a finite angle torque motor, and defining a permanent magnet material variable and a soft magnetic material variable; performing filtering, projection and constitutive equation electromagnetic field mapping through an electromagnetic field finite element model based on the material variable to generate a mapping material variable and a torque variable; constructing a constraint condition and a target function; and solving the magnetic field intensity characterization variable of the target function through an optimization solver to determine an optimal combination of the corresponding permanent magnet material variable and the soft magnetic material variable. According to the method, the distribution problem of the permanent magnets and the soft magnetic materials of the rotor back iron is converted into the topological optimization problem, the high-performance permanent magnet and soft magnetic material combination is obtained, the material utilization rate and the torque density of the permanent magnets and the soft magnets are improved, and the high material utilization rate of the rotor back iron of the limited angle torque motor is achieved.

The invention discloses a digital filtering circuit, a filter, a method, electronic equipment and a storage medium, and the circuit comprises a counting module which is used for inputting a sampling clock signal outputted by a modulator, and outputting a clock pulse signal according to the sampling clock signal and a preset oversampling rate; the accumulation module is used for receiving the clock pulse signal, the bit stream signal output by the modulator and the sampling clock signal, performing accumulation operation and down-sampling operation on the bit stream signal based on the clock pulse signal, the sampling clock signal and the target order information, and outputting an integral result signal; and the calculation module is used for receiving the clock pulse signal, the sampling clock signal and the integration result signal, and performing differential operation on the integration result based on the clock pulse signal, the sampling clock signal and the target order information to obtain a target filtering result.

The invention provides a land hydrological load deformation determination method combining a spherical harmonic domain and a spatial domain, and belongs to the field of geodetics. The method comprises the following steps: S1, based on a gravity field model and a land hydrological model, respectively extracting a 60-order spherical harmonic coefficient and a space grid value from a spherical harmonic domain and a space domain; thirdly, calculating the vertical deformation of the regional hydrological load by using the coefficients and the load number in the step S2; and then, in the step S3, the spatial grid value is subjected to spherical harmonic expansion to 60 orders and then is converted into a grid value again, and the grid value is differentiated from an original value to obtain high-frequency mass distribution information. And S4, integrating the high-frequency load mass by adopting a Green function to obtain the contribution of the high-frequency load mass to hydrological load deformation. And finally, S5, integrating the results of the spherical harmonic domain and the spatial domain to obtain the total load deformation contribution. According to the method, the calculation precision and efficiency are improved, and the method is suitable for GNSS load correction so as to accurately extract tectonic deformation information.

The invention discloses a theoretical calculation method for a vehicle collision compatibility index OLC. The theoretical calculation method comprises the following steps: S1, acquiring time-acceleration curve data; s2, integral calculation is conducted, and standard displacement-collision force curve data, the maximum displacement and the maximum acceleration of the front end of the vehicle are obtained; s3, simulating an FWRB collision test through the law of conservation of energy, and calculating the maximum displacement and the maximum acceleration value of the vehicle in the simulated FWRB collision test; s4, comparing and checking; s5, an MPDB collision test is simulated, and the OLC value of the vehicle in the simulated MPDB collision test is calculated; the invention provides a complete calculation method for theoretically estimating MPDB test compatibility index OLC based on real vehicle FWRB collision test data.

The invention relates to a multi-physics coupling analysis system and method based on a universal PDE solving base. The system comprises a general PDE solving base which is used for managing cooperative work among modules, providing a standardized interface, loading an electromagnetic model plug-in, a thermal model plug-in and a structural mechanical model plug-in according to acquired configuration file information, integrating the plug-ins and a core module through the standardized interface, constructing each physical field solving module, and solving each physical field solving module; selecting operators configured in a physical field solving module from a discrete operator library, discretizing the physical model to obtain a linear equation set, and solving the linear equation set to obtain a physical field result; and the adapter is used for acquiring the physical field result of the coupling region during each iteration, performing parameter conversion and space alignment, updating the physical model parameters in each physical field solving module based on the coupling response result, and outputting each physical field result when the iteration is stopped. By adopting the system, the solving efficiency and flexibility of the multi-physics coupling analysis system can be improved.