42 results about "Analytical equations" patented technology

Disclosed is an improved analytical method that can be utilized by hydrogen filling stations for directly and accurately calculating the end-of-fill temperature in a hydrogen tank that, in turn, allows for improvements in the fill quantity while tending to reduce refueling time. The calculations involve calculation of a composite heat capacity value, MC, from a set of thermodynamic parameters drawn from both the tank system receiving the gas and the station supplying the gas. These thermodynamic parameters are utilized in a series of simple analytical equations to define a multi-step process by which target fill times, final temperatures and final pressures can be determined. The parameters can be communicated to the station directly from the vehicle or retrieved from a database accessible by the station. Because the method is based on direct measurements of actual thermodynamic conditions and quantified thermodynamic behavior, significantly improved tank filling results can be achieved.

The invention relates to a sensorless brushless DC motor commutation deviation fast correction control system and a method. An analytical equation between the bus current difference before and after commutation and commutation deviation is derived according to the bus current fluctuation value before and after commutation. In view of the influence of commutation ripple and motor three-phase winding asymmetry on the accuracy of sampled current during actual bus current sampling, a method for current offset sampling in the same conduction zone is designed. The bus current difference is obtained according to the designed current sampling method, the commutation deviation is calculated based on the analytical equation, and the commutation signal is compensated and corrected in real time. By designing the sensorless motor commutation deviation fast correction control system, the commutation deviation convergence time is reduced greatly, and the commutation precision is improved.

The invention relates to a method of calculating AC impedance spectroscopy relaxation time distribution, so as to solve problems that the prior impedance spectroscopy analysis method has a low frequency resolution, the number of electrochemical reaction processes and actual impedance can not be effectively analyzed, and an analytical equation for relaxation time distribution can not be solved. The method is realized via the following technical scheme: 1, an AC impedance spectroscopy array including a frequency, an impedance real part and an impedance imaginary part are acquired; 2, KK test is carried out to enable the AC impedance spectroscopy array to be stable and analytical; 3, algebraic equations for relaxation time and a relaxation time distribution function are built; and 4, the relaxation time and a relaxation time distribution function array are obtained, a chart is drawn with logarithm of the relaxation time as transverse axis and with the relaxation time distribution function as longitudinal axis, each peak in the chart corresponds to a different electrochemical process, and the peak area represents the actual impedance of a different electrochemical process. The method of the invention is applied to the electrochemical field.

A method and system of optimizing a complex manufacturing process performed to achieve one or more processing objectives for the process and/or a component produced by the process. The system includes a graphical user interface, a process module, and an optimization module. The process module includes a training module, an empirical relationships database, an analytical equations database, a heuristic knowledge database, and a process models database. The graphical user interface is used to input one or more processing variables and constraints for the processing objective. The training module generates empirical relationships from the processing variable and empirical data obtained from the manufacturing process. The process module generates a process model that takes into consideration heuristic knowledge of the manufacturing process, empirical relationships, and optionally analytical equations relating to the manufacturing process. The optimization module employs the process model to optimize the manufacturing process.

Disclosed is an improved analytical method that can be utilized by hydrogen filling stations for directly and accurately calculating the end-of-fill temperature in a hydrogen tank that, in turn, allows for improvements in the fill quantity while tending to reduce refueling time. The calculations involve calculation of a composite heat capacity value, MC, from a set of thermodynamic parameters drawn from both the tank system receiving the gas and the station supplying the gas. These thermodynamic parameters are utilized in a series of simple analytical equations to define a multi-step process by which target fill times, final temperatures and final pressures can be determined. The parameters can be communicated to the station directly from the vehicle or retrieved from a database accessible by the station. Because the method is based on direct measurements of actual thermodynamic conditions and quantified thermodynamic behavior, significantly improved tank filling results can be achieved.

The invention discloses a control method for asymmetrical fillet weld joint melting form and melting depth. Melting forming of an asymmetrical fillet weld joint is controlled by adjusting the weldinggun angle, a front melting pool model is identified on the basis of a vision method, melting depth estimation and control are achieved, and due to the fact that the heat dissipation difference of twoside plates of an asymmetrical structure is large, melting forming of the two sides is difficult to control. The control method comprises the steps that on one hand, the melting pool form is controlled by controlling the welding gun angle, on the other hand, a finite-size fillet weld joint workpiece temperature field analytical model is derived on the basis of an instantaneous point heat source temperature field analytical equation of an infinite-body green function and a heat source equivalent method, melting pool edge feature points are obtained by means of image treatment to correct the analytical model, numerical calculation is conducted through the corrected analytical model, the maximum coordinate of the melting point temperature in the depth direction is solved, and then melting depth calculating and solving can be achieved. Through the method, control over melting forming of the asymmetrical fillet weld joint can be achieved, and the purpose of improving the welding quality ofthe special structure is achieved.

The invention discloses a water color satellite atmospheric layer top radiation product quality evaluation and cross calibration method. The method comprises the following steps: establishing a multi-source satellite quasi-synchronization effective pixel selection constraint condition; finding that radiation signal abnormity caused by the natural process has high interstellar correlation; designing a multi-source satellite radiation product error analytical equation; combining a dynamic cross radiation calibration mechanism; and determining the influence of the radiation product quality on the water color product. According to the scheme, constraint conditions of quasi-synchronous observation are specified for the first time, an analytic equation of multi-source satellite radiation product errors is determined, dynamic evaluation and cross calibration of the water radiation product quality are achieved, the defect that a traditional method is seriously influenced by abnormal signals caused by the natural process is overcome, and the water radiation product quality and the automatic service level are improved; and moreover, the method is easy to implement, can be used for dynamically monitoring and improving the quality of water radiation products, and has wider practical application value and economic value.

The invention discloses a method for achieving the double-station passive positioning through an external radiation source at an unknown position. Based on the principle that the radial distances, detected by two detection platforms at the same time, between the external radiation source and a target are definitely equal for the same external radiation source, the method comprises the steps: respectively obtaining a radial distance analytical equation between the external radiation source and the target through a T-R double-base-station positioning method based on time difference and azimuth measurement when each station performs independent positioning; taking a baseline distance between an unknown external radiation source and a detection station in a range finding equation as a continuously changing parameter variable; carrying out the traversing of all possible baseline distances, and carrying out the differential calculation of all obtained radial distance sequences calculated bytwo stations independently; finally determining the radial distance between the target and the external radiation source directly through searching the minimum difference value, and determining the baseline distances between the detection stations and the external radiation source through a serial number. Based on the above, the method can achieve the obtaining of the position of the target through a double-base positioning method, and also can achieve the solving of the baseline length between two detection stations.

The invention discloses an optimal orbit design method considering the constraint of a non-cooperative target no-fly zone, comprising the following steps: 1) establishing the earth inertia coordinatesystem EXYZ and the target spacecraft orbit coordinate system Txyz, setting the no-fly zone of the target spacecraft body and the no-fly zone of the target spacecraft sensor; 2) establishing a relative motion orbit model of the spacecraft, obtaining the solution of the relative motion orbit model of the spacecraft, eliminating the drift term, and then giving the conditions for tracking the initialposition and the final position of the spacecraft by use of the initial conditions; 3) constructing the analytical equation of the transfer trajectory; 4) constructing the mathematical expression ofthe constraint conditions of the no-fly zone, and then constructing the conditions to complete the orbital transfer avoiding the no-fly zone; 5) according to the analytical equation of the transfer trajectory, the mathematical expression of the constraint condition of the no-fly zone and the condition of avoiding the no-fly zone, completing the orbit transfer and designing the optimal transfer trajectory. The optimal trajectory of the no-fly zone constraint of the non-cooperative target can be obtained by this method.

The invention provides a tailing pond dry beach important parameter extraction method and system based on three-dimensional laser point clouds, and the method comprises the steps: 1, carrying out the range division, voxel down-sampling, filtering and denoising preprocessing of tailing pond three-dimensional laser point cloud data; 2, establishing a multi-dimensional feature model combining spatial features and laser reflectivity features, and proposing a dam body, dry beach and water surface boundary segmentation method based on Z gradient; 3, proposing a dry beach extraction model based on point cloud reflection intensity segmentation; 4, for the point cloud after dry beach segmentation, providing a dam body candidate set segmentation method based on linearity, establishing a main and auxiliary dam extraction model based on connectivity, and obtaining a dam body analytical equation; and 5, providing a point cloud-based dry beach parameter calculation method, setting calculation parameters along the main dam and the auxiliary dam, and calculating the length and gradient of the dry beach. The method and system have the advantages of low cost, high accuracy, wide range and the like, and can provide important basis for analysis and pre-arranged planning of safety accidents such as tailing pond dam break and the like.

Provided is a TOF MS equipped with an ideal reflectron that assures a high degree of freedom in design and in which the time of flight of ions having identical m/z does not depend on energy. The electric field formed by the reflectron is divided virtually into a deceleration region (B) where ions are decelerated and a reflection region (C) where ions are reflected, and the deceleration region is determined by one or more potential distributions, such as a first stage homogeneous decelerating electric field and a second stage homogeneous decelerating electric field, along the central axis. On the other hand, in terms of the reflection region, ions with a certain mass-to-charge ratio starting from a prescribed location under the parameters of the deceleration region are guided to the reflection region through a free-flight region (A) and the deceleration region. The potential distribution of those electric fields is determined by an analytical equation or numerical calculations such that time of flight for being turned around in the reflection region and returning to the original location is the same as the time of flight for ions with the identical mass-to-charge ratio having a return trajectory at the boundary between the deceleration region and reflective region or at a prescribed location within the deceleration region.

The invention provides a power management and decomposition method for a renewable energy direct-current hydrogen production island system, which comprises the following steps of: 1, establishing a static and dynamic model of an electrolytic cell, determining static and dynamic response characteristics of the electrolytic cell, and obtaining a dynamic response analytical equation of the electrolytic cell; 2, determining a power management method of the renewable energy direct current hydrogen production island system; 3, providing a renewable energy source and hydrogen production unit power instruction decomposition method by considering the dynamic response characteristics of the electrolytic cell; 4, control methods of the wind power generation unit, the photovoltaic power generation unit, the hydrogen production unit and the storage battery energy storage unit in different operation modes are determined; and step 5, determining the control architecture of the renewable energy direct current hydrogen production island system. The system stability is ensured under the condition that the energy storage capacity configuration is limited, the power of the hydrogen production unit is flexibly adjusted through the distribution coefficient, the control mode switching of the storage battery energy storage unit and the renewable energy power generation unit is avoided, and the complexity of coordination control of the wind and light hydrogen storage system is reduced.

The invention discloses a transformer neutral point fault voltage analyzing method. The method comprises the steps that sequence network analysis is carried out on a boundary condition with the single-phase-to-earth fault of a distributed photovoltaic power supply accessing a distribution network; a new fault boundary condition is acquired according to protection action, and accordingly the analytical equation of the main transformer neutral point voltage deviation after the protection action and influencing factors thereof are acquired; according to the output characteristics of the distributed photovoltaic power supply which is off-network in a short time, the relationship among the main transformer neutral point voltage, a local load and the output power of the photovoltaic power supply is acquired; the acquired typical daily output power curve of the distributed photovoltaic power supply is compared with the local load power demand curve; and accordingly the deviation level of the main transformer neutral point voltage after faults at different moments is acquired. The method is suitable for the configuration analysis of the main transformer gap protection in a new scenario with the distributed photovoltaic distribution network, is not limited by other operating conditions and line characteristic data, and has the advantages of simple operation and high practicality.

The invention discloses a method for designing a shading cylinder array in a compact multi-aperture off-axis beam combining system. The method comprises the following steps: respectively establishinga shading cylinder cylindrical curved surface space analytical equation in each off-axis beam combining system; solving the equation set to obtain the spatial position coordinates of the highest pointof the shading cylinder in each off-axis beam combining system; according to the space position coordinates of the lowest point and the highest point of the shading cylinder in each off-axis beam combining system, solving the inclination angle of the section of the inclined end surface of the shading cylinder in each off-axis beam combining system; and according to the inclination angle of the inclined section of the inner shading cylinder and a cylindrical curved surface equation of the inner shading cylinder, establishing an inner shading cylinder array of the compact multi-aperture off-axis beam combining system in three-dimensional modeling software (ProE, Cero and the like). According to the method, the inclination angle of the inclined section of the shading cylinder in the multi-aperture off-axis beam combination system is deduced mainly through a space analytic geometry method, the analysis thought can be suitable for design of the shading cylinder in any multi-aperture off-axis beam combination system, and mutual crosstalk of external stray light among sub-apertures of the multi-aperture off-axis beam combination system is effectively improved.

The invention discloses a programmed algorithm for simulating molecular chemical trend motion, which comprises the following steps of: establishing a finite element model related to receptor and ligand cross diffusion, and strictly deducing an analytical equation for unifying molecular chemotaxis behaviors from a statistical thermodynamics basic framework; developing a core algorithm capable of deducing the special motion process, flow field configuration and fluid properties serving as input parameters, giving numerical simulation to the molecular chemotaxis system, and using the molecular chemotaxis system for predicting and checking experiment results. According to the method, the first principle is followed, a dominance equation for describing molecular chemotaxis is completely derivedfrom the basis of a basic statistical thermodynamics theorem, trial mathematical expression and empirical parameter definition are not needed, and a general model is established; a motion equation isconverted into a core algorithm of a program, the motion trend and related effects of a specific molecular binding system are efficiently simulated on the basis of the properties of an actual system,and a quantitative prediction result is output and used for data mining and comparison.

The invention discloses an improved solving method for a Lambert orbital transfer problem based on a Newton iteration thought. The method comprises the steps of 1, calculating a transfer angle theta,an auxiliary variable c and an auxiliary variable s; 2, determining the shape of the track according to the transfer angle and the auxiliary variable in the step 1; 3, when delta t is larger than delta tp, determining that the transfer orbit is an elliptical orbit, and carrying out solving; 4, when delta t is smaller than delta tp, determining that the transfer orbit is a hyperbolic orbit, and carrying out solving; 5, when delta t is equal to delta tp, determining that the transfer orbit is a parabola orbit, and carrying out solving; 6, expressing the Lambert orbital transfer problem analytical equation in the steps 3-5 as a function of a conic curve semi-major axis, and calculating a conic curve semi-drift diameter; 7, calculating orbital transfer point speed and intersection speed; and 8, proving the high efficiency and accuracy of the improved solving method for the Lambert orbital transfer problem based on the Newton iteration thought. The invention aims to improve the solving speed of the Lambert orbital transfer problem in spacecraft rendezvous.

The invention provides model correction method and device suitable for an elastic connection structure. According to the method, a kinetic analysis model with a linear or nonlinear elastic connectionlink structure can be established. The most important advantage of the technology is that the connection rigidity can be explicitly expressed in an analytical equation; when connection parameters arechanged, kinetic analysis can be directly carried out, large-scale finite element calculation does not need to be carried out again, accordingly parameter design and dynamic response analysis can be carried out rapidly and efficiently, model parameter rapid correction can be carried out on the basis of an overall modal test of an elastic connection structure, and a kinetic model consistent with atest result is obtained.

The invention relates to the technical field of spiral rotor flow meters, and provides a spiral rotor modeling method based on virtual generating machining. The method aims to solve the problem that atraditional spiral rotor modeling method depends on the meshing principle, an end face profile curve analytical equation is established through derivation to obtain an end face profile curve of the spiral rotor, and a three-dimensional solid model generated on the basis has multiple defects. The method comprises the following steps of 1, constructing a rack-type cutter through two-dimensional software, carrying out virtual generating processing on a circular rotor blank model I by using the rack-type cutter, and simulating a tooth surface open line forming process to obtain a preliminary rotor end surface, and 2, taking the preliminary rotor end surface as a preliminary rotor cutter, carrying out virtual generating processing on the circular rotor blank model II, and simulating a tooth surface open line forming process to obtain a secondary rotor end surface. The method is particularly suitable for efficient and accurate modeling of the spiral rotor, and has high social use value andapplication prospect.