61 results about "Reverse transformation" patented technology

The invention relates to the technical field of information security, in particular to a lightweight encryption and decryption method, which comprises the following steps: acquiring a continuous binary data stream of a sensor and segmenting the continuous binary data stream into fixed-length groups; calling a pre-generated round key sequence and a whitening key, wherein the round key sequence is generated through master key shift operation and round constant iteration; performing XOR operation on the grouped data and the whitening key to output initial confusion data; segmenting the initial confusion data into four equal-length sub-segments to execute multiple rounds of iterative processing, wherein each round comprises 16-bit modular addition operation and fixed-bit cyclic shift; xOR is carried out on the shifted data and a current round key, a sub-segment state is updated according to a preset branch processing rule, and linear transformation is carried out on the updated state by adopting a self-inverse matrix; the last-round output sub-segments are spliced into a ciphertext to be transmitted to an execution mechanism; during decryption, reversely calling the round key sequence, and multiplexing the self-inverse matrix to execute inverse transformation and reverse operation to recover original data. The problem of high encryption delay of industrial control equipment is solved.

Techniques for conducting an air flow simulation for a wind turbine include importing a file containing a digitized representation of a three-dimensional blade geometry, extracting from the file, blade constructive parameters, and calculating a low-order air flow past a wind-turbine that includes the blade, based on a Blade Element Momentum Theory (BEMT) to determine sectional angle of attack and free-stream velocity, boundary layer transition, and acoustic noise results. The techniques also include performing air flow simulation for a given number of blade sections, and generating virtual microphone rings. The process also includes computing noise spectra at the virtual microphone rings and blending the noise spectra generated and generating synthetic noise signals from each section by inverse Fourier transform of the noise spectra and converting the noise spectra into an audio track.

The invention provides a calculation method and system for a two-dimensional foundation pit unsteady-state seepage field under suspension type retaining wall supporting, and belongs to the technical field of computer aided design. Dividing a seepage field around the foundation pit into three regular areas according to the boundary condition when the boundary state is zero when seepage does not occur; sequentially carrying out Laplace transformation, Fourier transformation and inverse transformation on the time variables in the unsteady-state seepage equilibrium equation and the boundary condition of each region to obtain an expression of a water head series solution of a water head of each region; constructing a non-homogeneous equation set by utilizing continuous conditions among the regions; programming solving is carried out by utilizing orthogonality of a trigonometric function, and obtained constant terms are substituted into expressions of water head series solutions of all the areas; and carrying out inverse transformation on the solved expression by adopting a Stehfest method to obtain an expression of the unsteady-state seepage field water head solution of the foundation pit. The seepage field analytic solution calculated by the method has high precision, and the dynamic change characteristic of the seepage field around the foundation pit along with time can be accurately determined.

The invention discloses a wave power generation and energy storage method based on a superconducting cable and an optimization controller. The method comprises the following steps: firstly, acquiring deviation between wave power generation power and power grid demand, and inputting the deviation to a TID controller after Laplace transformation; the core of the method is that an ant colony optimization algorithm is adopted to dynamically optimize a tilt term coefficient, an integral term coefficient and a differential term coefficient of a TID controller, a parameter space is discretized into candidate nodes, an ant colony probability optimization and pheromone updating mechanism is simulated, time weighted absolute error integral is taken as a fitness function, and an optimal control parameter combination is iteratively searched; based on the optimization result, the TID controller generates a master control signal, and after inverse transformation and physical constraint, the superconducting cable energy storage system is driven to rapidly charge and discharge, so that high-precision and self-adaptive stabilization of wave energy power fluctuation is realized. Intelligent parameter optimization and superconducting energy storage are combined, and the control performance, the response speed and the overall energy efficiency of the system are remarkably improved.

The invention discloses a transaction data generation method and device. The method comprises the following steps: randomly generating polynomial distribution noise and Levy distribution noise; based on a Levy distribution reverse denoising model, reverse denoising is carried out on Levy distribution noise, standardized inverse transformation is carried out on first data obtained through reverse denoising, and Levy distribution transaction data is generated; and based on the polynomial distribution reverse denoising model, performing reverse denoising on the polynomial distribution noise, and performing one-hot coding inverse transformation on second data obtained by reverse denoising to generate polynomial distribution transaction data. According to the Levy distribution reverse denoising model, a Levy distribution function which better conforms to financial data long-tail distribution characteristics is adopted to model numeric type, date type and time type data, samples which better conform to real data distribution are generated, and the actual availability of synthetic data is improved. Therefore, the accurate transaction data generation method is realized.

The invention discloses martensite structure genetic effect-based ultrahigh strength and plasticity advanced high-strength steel and a preparation method thereof, and belongs to the technical field of metal materials. The advanced high-strength steel comprises the following chemical components: C, Mn, Si, Al, Nb, Ti, Fe and the like, and the core of the advanced high-strength steel is that a microstructure is regulated and controlled through the'structure genetic effect 'of martensite: full martensite formed by pre-quenching is used as an initial structure, and reverse transformed austenite is preferentially nucleated on a martensite lath interface through critical zone annealing and inherits the lath form of the martensite lath; the double-peak retained austenite with battens as the main part (the volume fraction is larger than or equal to 70%) and blocks as the auxiliary part (the volume fraction is smaller than or equal to 30%) is finally obtained, the Mn element of the batten retained austenite is obviously enriched, the mass fraction of the Mn element is larger than or equal to 3.5%, the tensile strength of the finally-obtained advanced high-strength steel reaches 840-900 MPa, the ductility is 35-40%, the product of strength and ductility is larger than or equal to 31.5 Pa%, and the tensile strength is larger than or equal to 31.5 Pa%. The method is suitable for the fields of automobile lightweight, high-end equipment manufacturing and the like with strict requirements on material performance.

The application discloses a kind of based on dual three-dimensional memory hyperchaos SCMA-OFDM transmission system, the system includes sending end and receiving end, the user of sending end possesses respective codebook, J user shares K subcarrier, initial bit information and after the calculation of hyperchaos model of memristor triangle mapping chaotic codebook enter SCMA encoder and carry out codebook mapping processing, obtain encrypted SCMA-OFDM signal, for carrier synchronization, it is inserted pilot, after pilot, obtain frequency domain signal and information data using fast inverse fourier transform after the calculation of hyperchaos model of memristor triangle mapping, frequency domain signal is changed into time domain signal;Then to time domain signal is increased cyclic prefix CP and cyclic suffix CS to eliminate intercarrier interference, then parallel-serial conversion parallel signal is changed into serial signal, finally through up-conversion DUC complex signal mixing becomes real signal into transmission channel.The transmission system of regular hexagon chaotic codebook, its performance is improved by 2.5dB than traditional codebook.

The invention discloses a deflection calculation method of a steel-concrete composite beam under uniformly distributed loads, and relates to the technical field of high-speed railway bridge construction. The method comprises the following steps: establishing a differential equation of the continuous steel-concrete composite beam and carrying out Laplace transformation to obtain an expression of a non-zero real solution; inverse transformation is carried out on the equation obtained after Laplace transformation, an analytical expression of the deflection of the composite beam is obtained, and the expression comprises a plurality of unknown quantities. Substituting the structure parameters and the material parameters of the composite beam into the non-zero real number solution expression to solve Laplace transformation parameters; the parameters and the boundary conditions are substituted into the deflection analytical expression, and matrix elements used for solving unknown quantities are obtained; and constructing a linear equation set, solving an unknown quantity, substituting the unknown quantity into a deflection analytical expression, and finally obtaining a complete expression for solving the deflection of the continuous composite beam. The complete expression of the deflection of the continuous composite beam provided by the invention is suitable for analyzing the deflection of a single-span or continuous steel-concrete composite beam, and has relatively high calculation precision.

The invention discloses a cold machining method of a super duplex stainless steel seamless tube, relates to the technical field of stainless steel tube machining, and aims to solve the problems of long period, high cost and structure coarsening caused by multiple times of intermediate annealing in the prior art. The method adopts a three-stage cold-drawing process which does not need intermediate annealing and is sequentially and continuously carried out, and comprises the following steps: carrying out low-temperature first-stage pre-deformation, introducing alpha'martensite and inducing a strong gamma-phase texture; medium-temperature secondary main deformation is carried out, and full reversal of alpha'martensite and in-situ precipitation of nanoscale Cr2N in an alpha phase are synchronously realized by controlling the temperature, the strain rate and the deformation in a specific synergistic window; according to the seamless pipe and the preparation method thereof, the final deformation close to the reverse transformation temperature is adopted to stabilize the structure, triple cooperative regulation and control of the phase proportion, the nanometer precipitation and the crystal texture are achieved, the prepared seamless pipe has high yield strength, high toughness and excellent stress corrosion resistance, meanwhile, the production period is greatly shortened, and the cost is reduced.

The application provides a silicon-based free-space optical MEMS accelerometer and a manufacturing method, the upper layer of the accelerometer is a glass substrate free-space optical sensitive structure, the lower layer is a silicon-based horizontal axis MEMS sensitive structure, and the upper layer structure is fixed on the lower layer structure through a bonding process. The upper layer optical sensitive structure is composed of a pair of Michelson interferometers, a glass anchor point and a glass mass; the lower layer MEMS sensitive structure is composed of four groups of cantilever beams, a silicon anchor point and a silicon mass. The lower layer MEMS sensitive structure converts the horizontal axis input acceleration into the displacement of the silicon mass, the displacement is synchronously transmitted to the glass mass, and a pair of reversely arranged Michelson interferometers convert the displacement into the reverse transformation of the phase of the interference light, so that the high-precision differential detection of the acceleration is realized. The micro-optical accelerometer scheme provided by the application has the outstanding advantages of high detection sensitivity, strong anti-common-mode error capability and high integration.

The invention discloses a fully homomorphic encryption high-precision bootstrap method which can give consideration to both efficiency and precision. The method sequentially comprises the steps of modulus improvement, coefficient slot transformation, polynomial approximation, inverse transformation and scaling. According to the method, firstly, the modulus is improved, the modulus space is expanded, and the slot vector is converted, so that large-scale parallel processing is realized; secondly, adopting a double-stage approximation framework, namely, firstly performing global preliminary approximation by using Fourier series, and then performing local refined optimization by using Chebyshev interpolation in a key effective approximation interval so as to effectively balance the calculation efficiency and the approximation precision; and finally, an error-aware adaptive node allocation algorithm is introduced to break through the traditional mode of uniform resource allocation, and remarkably higher overall approximation precision is obtained through dynamic optimization with the completely same calculation cost.

The application discloses a TMCP preparation method of a low-carbon equivalent high-strength steel of a ship plate, and belongs to the technical field of metal material processing. The steel material comprises C, Si, Mn, Ni, Cr, Mo, Al, Nb, P, S, Fe and impurities. The preparation method comprises the following steps: smelting and continuous casting, slab heating, controlled rolling, quenching treatment and reverse phase transformation annealing. The application adopts low-carbon medium-nickel collaborative design, replaces interstitial atom carbon with substitution atom nickel as an austenite stabilizing element, introduces high-density crystal defects through controlled rolling, obtains full martensite structure in combination with offline quenching, and then is subjected to two-phase zone reverse phase transformation annealing to obtain the final structure of a tempered martensite matrix with 10% to 20% thin film-shaped reverse transformation austenite distributed thereon. The obtained steel material has high yield strength and high impact energy at-80 DEG C, and welding does not need preheating, and has high strength, excellent low-temperature toughness and excellent welding performance, and is suitable for high-value-added application scenarios such as polar ships.

The invention discloses a multiple parallel interphase circulating current suppression and dead zone compensation method based on a dynamic dead zone, and the method comprises the steps: achieving the circulating current suppression through a mode of adjusting the dead zones of inverters, obtaining the duty ratios of all parallel inverters, determining and calculating the dead zones based on the duty ratios of all inverters, taking the inverter with the small duty ratio as a negative deviation square, and enabling the inverter with the small duty ratio to serve as a negative deviation square. According to the method, dead zone adjustment is carried out according to a comparison result of a calculation dead zone and an inverter inherent dead zone and a maximum dead zone, dead zone compensation is further carried out on a single inverter, three-phase current is converted into direct current through a 3 / 2 conversion mode, then filtering is carried out, then the direct current is converted into smooth and clean three-phase current through an inverse conversion mode, disturbance is eliminated, and the direct current is filtered. The problem of current zero crossing point direction discrimination error during dead zone compensation is solved; according to the technical scheme, starting from the actual control effect of each inversion module, the duty ratio is actively adjusted according to the current, the purpose of eliminating circulating current is achieved, and the problems of time delay and wrong current direction judgment are solved on the premise of eliminating disturbance.

The application discloses a power system nonlinear load power metering method based on improved S transformation, and comprises the following steps: step one, extracting voltage and current fundamental component and distortion component based on IST, and obtaining voltage and current fundamental part and distortion part signals respectively; step two, reconstructing voltage and current signal fundamental discrete signals and distortion discrete signals through IST inverse transformation; step three, carrying out dot product and operation on the reconstructed voltage and current signal fundamental discrete signals and distortion discrete signals, and thus power metering of the signals can be completed. The decomposition and reconstruction algorithm based on IST provided by the application can significantly improve metering precision when metering power under the condition of existing harmonics and nonlinear load, and the application provides theoretical support and application guidance for applying the IST method to new power system power metering with a high proportion of nonlinear load.

The method is for homolytic and heterolytic cleavage in molecules of gases and liquids with the release of bonding energy and its use to change the internal geometric architecture of some molecules, leading to the synthesis of new chemical compounds that are not contained in the initial gases and liquids, with the secondary release of energy during the synthesis process, without carrying out nuclear reactions on equipment for its realization, characterised by an increase in the energy of the work environment and use of this energy to generate thermal energy with simultaneous synthesis of new chemical compounds, in consequence of the physical effect of a standing pressure wave on the gas and liquid molecules at various temperatures, where the temperature is a measure of activation energy, and subsequent dissociation of the molecules into atoms or fragments of molecules (radicals), partial ionization of atoms and subsequent transformation of the bonds in atoms of the molecules with no change to atomic number but with a change to atomic mass and in the proton-neutron ratio. The method also consists in the direct conversion of neutron mass into the mass equivalent to the total mass of 1 electron and 1 proton that do not go beyond the framework of the electrodynamic interaction of electrons and the nucleus, which ensures the absence of radiation, where the method also consists in the transformation of an atom into a chemical molecule or the reverse transformation of 1 electron and 1 proton into 1 neutron from the volume, where these elementary particles can be free, with external exchange of energy and mass equalling the mass with a positive charge and equal to the reduction in the mass of the neutron and proton. The method furthermore consists in a back reaction to the physical effect consisting in the formation of new chemical compounds that are not contained in the initial gases and liquids, with the release of the energy produced during the process of recombination of atoms into the original molecules, where the execution of the proposed method takes place through a combination of initial influences, such as for example: 12 C 1 H 4=16 Ne=16 O, while the method further consists in rearranging the architecture of some molecules without changing the atomic number, mass number, atomic weight as a reaction to a physical impact, during which new chemical compounds are synthesized, including those that they are not contained in the initial gases and liquids, while the energy generated during these synthesis reactions is released, for example 14 N 2=12 C 16 O; 12 C 16 O 2=14 N 2 16 O. The proposed method is implemented by a combination of initial influences, such as:increase in temperature of up to 250° C., ideally 140° C. to 150° C.;reduction in pressure (creation of a reduced atmosphere) to-100 kPa, ideally-65 kPa;generation of standing pressure waves;electric discharge (tribostatic discharge, barrier, spark) with a breakdown voltage of 1 to 15 kV;the value of the magnetic field in the reactor based on the discharge in the gas is 70 to 120 nTl;micro-explosions;impact, impact force, at which negative acceleration at from 50,000 to 150,000 g occurs;or a combination of these influences.The apparatus for converting hydrocarbon and non-hydrocarbon gases and liquids consists ofan acceleration module, which is a piece of apparatus accelerating a mixture of gas and liquid up to a speed of 30 to 400 m / s;a deceleration module, which is a tribostatic energy generator covering 70% to 90% of the reactor's cross-section;a tribostatic generator, which consists of two electrodes which are placed side by side an on which positive and negative charges are mutually created;a reduced atmosphere zone after the deceleration module.

The present application relates to a kind of big data platform-oriented stream data incremental cleaning method, belong to data cleaning technical field, comprising the following steps: step 1: data stream is divided into sliding window according to the preset window time length, and adjacent relation graph is constructed according to leaf node co-occurrence relationship;Step 2: the data record in each near neighbor bucket is constructed field fingerprint string, and the data record that field fingerprint string is not identical with all leading mode fingerprints in leading mode fingerprint set is marked as dirty data mode seed;Step 3: with dirty data mode seed as the initial label of dirty data area, the data record of dirty data area is executed local cleaning operation according to original field unit and is recovered after inverse transformation and outputs cleaning result.The present application is applicable to real-time big data scene such as Internet of Things and financial transaction.

The present application relates to a kind of big data platform-oriented stream data incremental cleaning method, belong to data cleaning technical field, comprising the following steps: step 1: data stream is divided into sliding window according to the preset window time length, and adjacent relation graph is constructed according to leaf node co-occurrence relationship;Step 2: the data record in each near neighbor bucket is constructed field fingerprint string, and the data record that field fingerprint string is not identical with all leading mode fingerprints in leading mode fingerprint set is marked as dirty data mode seed;Step 3: with dirty data mode seed as the initial label of dirty data area, the data record of dirty data area is executed local cleaning operation according to original field unit and is recovered after inverse transformation and outputs cleaning result.The present application is applicable to real-time big data scene such as Internet of Things and financial transaction.

The application discloses a deflection calculation method of a steel-concrete composite beam under uniform load, and relates to the technical field of high-speed railway bridge construction. The method comprises the following steps: a differential equation of a continuous steel-concrete composite beam is established, and Laplace transformation is performed to obtain an expression of non-zero real number solution; inverse transformation is performed on the equation after the Laplace transformation to obtain an analytical expression of the deflection of the composite beam, which contains multiple unknown quantities. The structural parameters and material parameters of the composite beam are substituted into the non-zero real number solution expression to solve the Laplace transformation parameters; the parameters and boundary conditions are substituted into the deflection analytical expression to obtain matrix elements for solving the unknown quantities; a linear equation set is constructed, the unknown quantities are solved, and then are substituted into the deflection analytical expression to finally obtain a complete expression for solving the deflection of the continuous composite beam. The complete expression of the deflection of the continuous composite beam provided by the application is suitable for analyzing the deflection of a single-span or continuous steel-concrete composite beam, and has high calculation precision.

The invention relates to 1500MPa-grade hot-rolled medium manganese steel and a short-process preparation method thereof. The steel comprises the following chemical components in percentage by mass: 0.23%-0.26% of C, 6.7%-7.2% of Mn, 1.4%-1.6% of Al, 0.75%-0.85% of Si, 1.9%-2.1% of Cr, less than 0.005% of P, less than 0.02% of S and the balance of Fe and inevitable impurities. The microstructure of the hot-rolled medium manganese steel is composed of lath-shaped martensite, fine reversed austenite and nanoscale Cr-rich carbide. The purposes of softening martensite and generating fine reversed austenite are achieved by reasonably designing the component proportion, optimizing the annealing process and accurately controlling the morphology and proportion of a multi-phase structure, and the toughness and plasticity of the hot-rolled medium manganese steel are enhanced through the continuous and gradient TRIP effect.

The invention discloses a low-speed sensorless sliding mode control algorithm for a permanent magnet linear synchronous motor, and relates to the technical field of motor parameter identification and sensorless sliding mode control. The control algorithm comprises Frenet inverse transformation, a quantum cuckoo parameter identification algorithm, a novel approaching rate sliding mode controller and 18-sector SVPWM (Space Vector Pulse Width Modulation). Frenet inverse transformation can realize coordinate transformation without depending on the linear motion electrical angle of the motor; a quantum-classical fusion optimization normal form is adopted, quantum entanglement and a quantum revolving door are introduced into a cuckoo algorithm, based on a quantum partial trace theory, space dimension reduction of strong coupling parameters of a motor is realized, online identification precision of parameters such as resistance, inductance and flux linkage is improved, and a sliding mode controller based on a novel approaching rate solves the buffeting problem of traditional sliding mode control. The convergence speed is improved; the 18-sector SVPWM can eliminate even harmonics, improve dynamic response and realize smooth commutation. According to the invention, the accuracy of low-speed sensorless control of the permanent magnet linear synchronous motor can be improved, additional cost does not need to be increased, and the method has high application value.

The application provides a method for designing high-strength martensitic stainless steel based on phase change toughening, and relates to the technical field of performance control of martensitic stainless steel. The method for designing high-strength martensitic stainless steel based on phase change toughening comprises the following steps: raw material weighing and smelting, homogenization heat treatment-oil quenching treatment, solid solution treatment-oil quenching treatment, deep cooling treatment with temperature control, aging treatment for adjusting reverse transformation austenite content. The component content of the high-strength martensitic stainless steel is as follows in percentage by mass: Cr 10-12%, Ni 7-9%, Co 4-6%, Mo 2-4%, and the high-strength martensitic stainless steel also contains Mn, V, Si, C and other elements, and the rest is Fe and inevitable impurities. The method is simple and easy to operate, green and environmentally friendly, low in cost, short in process, high in efficiency, and beneficial to industrial large-scale production and popularization.

The application provides a Hawk algorithm acceleration method based on GPU multi-thread parallelism. The Hawk algorithm acceleration method based on GPU multi-thread parallelism comprises the following steps: (1) thread resource division and task mapping; (2) kernel fusion and throughput peak detection; (3) NTT / iNTT parallelization reconstruction and memory access optimization; (4) FFT / iFFT structured parallelization optimization and butterfly operator fusion. The application realizes a coarse-grained parallel butterfly operator execution mode without complex address calculation, without shared memory synchronization, and without competition between threads, greatly improving the throughput efficiency on the GPU; meanwhile, the application unifies the parallel execution framework in the forward and inverse transformations of FFT / NTT, wherein the inverse transformation only needs to use the corresponding inverse rotation factor and perform simple normalization processing at the end to complete the overall recovery.

The invention provides a hybrid excitation motor fault-tolerant control method, device and equipment based on a four-bridge-arm inverter and a storage medium, and the method comprises the steps: responding to a fault of a first bridge arm, disconnecting the first bridge arm, connecting a fourth bridge arm, and obtaining a position angle and dq-axis reference current of a motor rotor; performing Clarke inverse transformation and Park transformation based on the dq-axis reference current to obtain a zero-axis compensation current; generating a target voltage vector based on the dq-axis reference current and the zero-axis compensation current; determining a target sector corresponding to the target voltage vector in a pre-established three-dimensional vector SVPWM space; acquiring a plurality of control vectors based on the target sector; generating duty ratio data of each bridge arm switch tube based on a voltage balance principle in combination with a plurality of control vectors; and controlling each bridge arm switch tube based on the duty ratio data. Through the technical scheme of the invention, fault-tolerant operation after the bridge arm has a fault can be realized.

The invention discloses an offshore wind turbine generator converter motor side control method and system. The method comprises the following steps: acquiring motor current, and performing coordinate transformation to obtain d-axis current and q-axis current under a two-phase synchronous rotating coordinate system; respectively comparing the output active power effective value with an active power reference value and comparing the output reactive power effective value with a reactive power reference value, and then obtaining an active current reference value and a reactive current reference value through PI regulation; respectively comparing the active current reference value and the reactive current reference value with d-axis current and q-axis current of the two control loops, and respectively obtaining d-axis voltage and q-axis voltage of the two control loops through current loop PI regulation and decoupling feedforward; and the d-axis voltage and the q-axis voltage of the two control loops drive corresponding phase IGBTs after being subjected to coordinate inverse transformation and a PWM (pulse-width modulation) strategy respectively. By improving the control strategy, the performance of the converter is improved, the electric energy quality and the electromagnetic compatibility are improved, and the optimized control method reduces the calorific value, improves the response speed and improves the economic benefit.

The invention relates to the technical field of steel and iron materials, and discloses medium manganese steel and a method for preparing the medium manganese steel. The medium manganese steel is provided, and the medium manganese steel comprises the following chemical components in percentage by mass: 0.05 wt.%-0.35 wt.% of C, 3.0 wt.%-6.0 wt.% of Mn, 0.1 wt.%-2.0 wt.% of Si, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: carrying out reverse transformation annealing on the cold-rolled steel sheet, and then carrying out rapid heating thermoforming and baking. The medium manganese steel has the advantages that the obtained medium manganese steel has an organization structure of superfine martensite mixed with nano twin austenite, the tensile strength is 1600 MPa or above, and the product of strength and ductility is larger than 30 GPa%.

The present application relates to the technical field of information security, and more particularly to a lightweight encryption and decryption method, comprising: obtaining sensor continuity binary data stream and dividing it into fixed length packets; calling pre-generated round key sequence and whitening key, wherein the round key sequence is generated by main key shift operation and round constant iteration; performing XOR operation on the packet data and the whitening key to output initial confusion data; dividing the initial confusion data into four equal length subsegments to perform multi-round iteration processing, each round including 16-bit modulo addition operation and fixed bit cyclic shift; performing XOR operation on the shifted data and the current round key, updating the subsegment state according to a preset branch processing rule, and performing linear transformation on the updated state using a self-inverse matrix; splicing the subsegments output in the last round into ciphertext and transmitting to an execution mechanism; and calling the round key sequence in reverse direction during decryption, performing inverse transformation and inverse operation using the self-inverse matrix to restore the original data. The present application solves the problem of high encryption delay of industrial control equipment.

This invention discloses a low-storage, high-reliability transceiver cooperative interleaving transformation method for random multiplexing communication systems. The method includes: at the transmitter, mapping the bit stream to be transmitted into source domain information symbol vectors; interleaving and rearranging the symbol vectors using a low-storage interleaver; performing phase perturbation and multi-layer coupling transformation on the interleaved and rearranged transmitted signal to generate a high-reliability random multiplexing modulation signal and adding a cyclic prefix before sending it to the receiver; at the receiver, after receiving the signal, removing the cyclic prefix to obtain a time-domain observation signal vector; performing iterative signal detection using an HR-CD-MAMP detector matched to the transmitter's transformation to complete symbol estimation; and completing the interleaving and deinterleaving operations of the high-reliability transformation and inverse transformation in the iterative estimator using a low-storage interleaver corresponding to the synchronization parameters to recover the source domain symbol vectors; and recovering the binary bit stream from the obtained source domain symbol vectors through digital demapping.

The application provides a three-dimensional recycled concrete random aggregate multi-phase model construction method. In view of the problems of insufficient gradation control precision, low collision detection efficiency, difficulty in high volume fraction casting and lack of multi-phase geometry generation in the prior art, the application provides a model construction method which combines Andreasen continuous gradation control, two-stage collision detection and multi-stage repair strategy. The method comprises the following steps: generating an aggregate pool and determining the target number based on the Andreasen gradation index and inverse transformation method; constructing a three-dimensional collision grid and an occupancy grid, and performing collision judgment through a two-stage collision detection system composed of an external ball pre-screening and GJK accurate detection; implementing two-stage casting by combining blind casting with grid search, and performing edge casting and edge repair by using one-way push away and shrink repair during the casting process; performing post-processing repair on residual overlap by using two-way push away, shrink repair and forced removal; and finally generating a multi-phase geometric model including a new interface transition zone, an old mortar layer, an old interface transition zone and an aggregate core based on the internal shrinkage method. The application can realize high-density collision-free casting with a volume fraction of more than 45%, significantly improve the collision detection efficiency and gradation control precision, and the generated multi-phase model can be directly used for fine numerical simulation in mainstream finite element software.

The invention provides a Hawk algorithm acceleration method based on GPU (Graphics Processing Unit) multi-thread parallel. The GPU multi-thread parallel-based Hawk algorithm acceleration method comprises the following steps of (1) thread resource division and task mapping; (2) kernel fusion and throughput peak detection; (3) NTT / iNTT parallel reconstruction and memory access optimization are carried out; and (4) carrying out FFT / iFFT structured parallel optimization and butterfly operator fusion. According to the method, a coarse-grained parallel butterfly operator execution mode which does not need complex address calculation, does not need shared memory synchronization and does not compete among threads is realized, and the throughput efficiency on the GPU is greatly improved; meanwhile, a parallel execution framework is unified in forward and reverse transformation of the FFT / NTT, and overall recovery can be completed only by using a corresponding reverse twiddle factor and performing simple normalization processing at the tail end in the reverse transformation.

The invention discloses a worm gear shaft mirror image transmission electric push rod, and belongs to the technical field of devices for converting rotary motion into reciprocating motion or carrying out inverse transformation, the worm gear shaft mirror image transmission electric push rod comprises a supporting shell, a transmission cavity is formed in the upper portion of the supporting shell, a transmission system is arranged in the transmission cavity, and the transmission system comprises a power input shaft and a worm. And the gear shafts are mirrored on the two sides of the power input shaft and the worm. By redesigning the transmission system of the electric push rod, the two sides of the worm linked with the power motor can provide effective transmission force output, unbalance loading of the worm is avoided, and therefore the operation stability of the transmission system is improved, shaking of the transmission system is reduced, the service life of the transmission system is prolonged, and the utilization rate of the torque of the power motor is increased.