1503 results about "Theoretical models" patented technology

A method for modeling diffraction includes constructing a theoretical model of the subject. A numerical method is then used to predict the output field that is created when an incident field is diffracted by the subject. The numerical method begins by computing the output field at the upper boundary of the substrate and then iterates upward through each of the subject's layers. Structurally simple layers are evaluated directly. More complex layers are discretized into slices. A finite difference scheme is performed for these layers using a recursive expansion of the field-current ratio that starts (or has a base case) at the lowermost slice. The combined evaluation, through all layers, creates a scattering matrix that is evaluated to determine the output field for the subject.

A method for controlling an arc welding equipment (21) used in a welding operation and adjustable by varying at least one welding parameter value, comprising the steps of determining said at least one welding parameter while using a theoretical model (24) of the welding process associated with the welding operation, and controlling the operation of the welding equipment and the welding process associated therewith by using said at least one welding parameter for adjusting the welding equipment and a device comprising an arc welding equipment (21) used in a welding operation and adjustable by varying at least one welding parameter and an arrangement (22) for controlling the operation of the arc welding equipment, said control arrangement including a means (23) adapted to determine the value of said at least one welding parameter while using a theoretical model (24) of the welding process, and a member (25) adapted to control the operation of the welding equipment and the welding process associated therewith by using said at least one welding parameter value for adjusting the welding equipment.

To perform a non-destructive condition assessment of a pipe carrying a fluid, an actual value representative of the propagation velocity of an acoustic disturbance propagating between two longitudinally separated points on the pipe is determined. A corresponding predicted value for the propagation velocity is computed as a function of at least one wall thickness parameter of the pipe by using a theoretical model for the propagation of acoustic waves in the pipe that assumes said pipe has a finite wall thickness with a predetermined circumferential thickness profile. The wall thickness parameter is then computed by matching the actual value with the predicted value, for example, by substituting the actual value in a formula predicting the theoretical value.

To perform a non-destructive condition assessment of a pipe carrying a fluid, an actual value representative of the propagation velocity of an acoustic disturbance propagating between two longitudinally separated points on the pipe is determined. A corresponding predicted value for the propagation velocity is computed as a function of at least one wall thickness parameter of the pipe by using a theoretical model for the propagation of acoustic waves in the pipe that assumes said pipe has a finite wall thickness with a predetermined circumferential thickness profile. The wall thickness parameter is then computed by matching the actual value with the predicted value, for example, by substituting the actual value in a formula predicting the theoretical value.

An optical metrology system includes model approximation logic for generating an optical model based on experimental data. By eliminating theoretical model generation, in which the fundamental equations of a test sample must be solved, the model approximation logic significantly reduces the computational requirements of the metrology system when measuring films formed on patterned base layers. The experimental model can be created by selecting an expected mathematical form for the final model, gathering experimental data, and compiling a lookup model. The lookup model can include the actual measurement data sorted by output (attribute) value, or can include “grating factors” that represent compensation factors that, when applied to standard monolithic model equations, compensate for the optical effects of grating layers.

The invention discloses a method for compensating a motion path of a mechanical arm based on vision measurement. Vision guides the mechanical arm to move. According to the method, due to vision measurement, the position of the mechanical arm, the position of a spacecraft and a position to be mounted are different from theoretical positions in a theoretical model, and a path planning deviation of the mechanical arm is compensated, so that a control effect on safe get in and get out of a narrow space is achieved, and a requirement on high-precision and high-reliability assembling of the spacecraft is met. Due to the method, an error between an actual position of the spacecraft and the theoretical position of an ideal model is identified, and the motion path of the mechanical arm is compensated, so that the position and the path can be more precisely controlled, and the control effect on safe get in and get out of the narrow space is achieved. The measurement method disclosed by the invention is wide in application range and can be applied to a spacecraft assembling process for different types under different assembling working conditions.

The invention discloses an on-line detection method for line heat forming of a ship outer plate, and belongs to the field of shipbuilding technologies and optical measurement. The method comprises the following steps: A, establishing a ship theoretical model point cloud; B, scanning and obtaining a ship measurement point cloud; C, performing coordinate system registration for ship theoretical model point cloud and the ship measurement point cloud; D, calculating the distance between every point in the ship measurement point cloud and a theoretical curve surface so as to present the deviation between the measurement point cloud and the theoretical model point cloud; E, expressing the deviation value by a color map. Compared with a traditional sample case / sample plate detection method, the method is high in detection efficiency and precision, and the detection result can be quantized and is good in readability.

The invention relates to a dynamic image modulation transfer function measuring device belonging to the field of optical property tests and sequentially comprising a point light source, a collimator objective, a pupil coupling system and a photoelectronic imaging system along the light propagating direction, and also comprising a driver, a motor, a lead screw, a computer and an image collector card, wherein the pupil coupling system adopts parallel light incidence and parallel light emergence; the entrance pupil of the pupil coupling system and the exit pupil of the collimator objective have same size and same position; the exit pupil of the pupil coupling system and the entrance pupil of the photoelectronic imaging system have same size and same position; the pupil coupling system is dismantled, and the exit pupil of the collimator objector and the entrance pupil of the photoelectronic imaging system have same size and same position; and the time difference of image acquisition of the photoelectronic imaging system and the travel of a sliding block I is set by a hardware delay circuit or software delay program. The device can not only eliminate image vignetting caused by target travel, but also can realize time comparison of the measurement result and the theoretical model.

The invention discloses a high-temperature creep deformation prediction and creep damage analysis method for a high-chrome steel component. The method comprises the following steps of: establishing a theoretical model, determining material parameters, designing a numerical integration algorithm, carrying out the secondary development of finite element software, carrying out the creep damage analysis of the component and the like. Compared with an existing technical scheme, the method disclosed by the invention is characterized in that a great improvement is carried out, the accurate prediction of the creep behavior and the creep damage of the high-chrome steel component can be realized, and therefore, the method has an important application value in the fields of the security design and the residual life evaluation of high-temperature high-pressure components in a supercritical generator set.

The invention relates to the field of oil-gas field exploration and development, particularly to a quantitative forecasting method of tectonic fissure occurrence. The quantitative forecasting method includes firstly determining a fissure mechanical property and rock mechanics parameters in a research area and restoring a paleotectonic map; secondly performing a numerical simulation of a paleostress field; thirdly selecting an appropriate rock failure principle according to the simulated paleostress field and the fissure mechanical property, and forecasting the best occurrence and the second-best occurrence of paleofissures on the basis of plane shearing strength distribution or profile shearing strength distribution of the stress field in the research area; coupling spatial positions of the paleorock stratum and the current rock stratum based on the simulated ant tracing technique, and then establishing a spatial switching theoretical model of the paleorock stratum and the current rock stratum; performing the quantitative analysis of fissure kinematics characteristics, and forecasting the occurrence of the current fissures according to that of the paleofissures.

The invention discloses a double-rotor-wing unmanned plane. Flying control on the double-rotor-wing unmanned plane is realized based on a four-rotor-wing unmanned plane flying control principle by designing a single-degree-of-freedom automatic tilter, semi-rigidity rotor wings and a flying control system. The unmanned plane consists of a stander, a plane body, a power bin, rotor wing systems and a rotor wing system support, wherein the plane body is provided with an equipment bin in which a flight posture sensor group, a PID controller, a lithium battery and an electronic speed controller are arranged; the plane body, the power bin and the rotor wing system support are in rigid fixed connection through the stander; a brushless motor and a steering engine are arranged in the power bin; the steering engine drives a pull rod to operate the single-degree-of-freedom automatic tilter and control the rotor wings to periodically change the distance; the angle of the tilter is measured by a potentiometer, so that precise control is facilitated; the rotor wing systems are symmetrically arranged and are positioned on the same horizontal plane; the rotating directions of the rotor wings are opposite, and the rotor wings are mounted on a total distance hinge so as to be mechanically limited to do waving motion. According to the unmanned plane, the operation mechanism is simplified; the flying quality is good; the requirement on the precision of a theoretical model is low, and an extremely high practical value is achieved.

The invention relates to a digitizing detection method of a complicated curved face. The method comprises the following steps: (1) extracting the geometric data of a CAD model of the complicated curved face, establishing an NURBS theoretical model of the complicated curved face, measuring a part object with the curved face by a three-coordinate measuring machine, digitizing the surface of the partto obtain the parameter of a measuring point; (2) establishing a binary nonlinear mathematical model with the minimum distance from the measuring point to an isoparametric line areas of the curved face by searching two groups of isoparametric line areas with isoparametric line structure proximate to the measuring point on the CAD curved face; and (3) calculating the shape error of the complicatedcurved face by a genetic algorithm to realize the error estimation of the complicated curved face. Compared with the prior art, the invention establishes an accurate curved face theoretical model, enhances the searching efficiency, can ensure the acquisition of a globally optimal solution and lightens the measuring intensity.

The invention discloses a tight reservoir volume pressure crack network extension simulation and representation method. The method comprises the following steps of: firstly establishing a multi-crackstress interference-considered tight reservoir combined ground stress field calculation model by utilizing a displacement discontinuity method, mechanical mechanism analysis and crack initiation and extension criterions; aiming at a stress interference problem in volume pressure crack multi-crack extension process, establishing flow pressure drop distribution models, in primary and secondary cracks, of a fracturing fluid, so as to form a tight reservoir volume pressure crack horizontal well crack network extension theoretical model; and finally comprehensively analyzing influences, on volume pressure crack network structural morphology, of different factors, and defining a plurality of feature parameters to represent crack network structure morphology and attribute features. At last, the tight reservoir volume pressure crack network extension simulation and representation method is established. The tight reservoir volume pressure crack network extension simulation and representation method has the advantages of being comprehensive in model factor consideration, high in simulation effect and visual in result, and has a certain guiding significance for optimum design and efficient development of tight reservoir cracks.

The invention discloses a quasi-continuous laser metal 3D printing method capable of realizing regulation of nickel base alloy crystallographic texture. Laser output is set as a quasi-continuous lasermode, and then a laser metal 3D printing technical window is preliminarily optimized. The temperature field of a molten bath under the preliminarily optimized parameter is calculated by using a finite element heat transfer model; the temperature gradient G and the cooling rate xi of the moving boundary of the molten bath during closing of laser in a single pulse period are extracted, and the growth length L of a single pulse internal columnar dendrite is worked out according to a structure growth theoretical model; the laser parameter is optimized according to the matching rule that the ratioof the scanning speed V to pulse frequency f is 0.5-0.8L, and finally 3D printing forming is conducted according to the optimized parameter, so that a formed part with the consistent crystallographicorientation height is obtained. By regulating the heat source output mode, an effective remelting mechanism for mixed crystal or isometric crystal is introduced in the scanning direction, all columnar dendrite growth is obtained, and the consistency of grain orientation is remarkably improved.

The invention provides deep inclined fractured reservoir earthquake amplitude prediction technology and belongs to the field of seismic prospecting. In the method, deep inclined fractured reservoir earthquake amplitude prediction is performed by using pre-stack seismic amplitude data and the method comprises the following steps of: performing theoretical model forward and inversion analysis of an inclined fracture medium on target area characteristics to acquire optimization and inversion parameters; optimizing date by the pre-processing of data, macro-surface element partial superposition and a residual gather leveling method so as to optimize parameters; and performing inclined fracture medium theory-based reservoir fracture inversion to obtain the parameters of the fracture. In the method, special processing means are adopted according to the characteristics of the deep reservoir, so that the signal-to-noise ratio is improved, and the real amplitude is guaranteed to the maximum extent. By using the method, the inclined fracture of the deep reservoir can be accurately predicted; accuracy and applicability are high; and the method is an effective method for predicting a deep fractured reservoir.

The present invention relates to a new method for characterizing magnets, magnetic assemblies (combinations of magnets) and magnetic materials. In what follows, these will be called under the common term ‘magnetic systems’. The method is based on obtaining quantitative properties of the magnetic system by combining magnetic field measurement data and theoretical modeling or simulation data. The input parameters of the theoretical model are optimized using an optimization method in order to obtain a best fit to the measured data. In this method, the present invention involves precalculating magnetic field distributions prior to the optimization execution in order to considerably speed up the process. Combining this advanced data processing with fast magnetic field mapping using e.g. a magnetic field camera, allows real-time measurement and data analysis of magnetic systems for applications in e.g. quality control of such magnetic systems.

The invention discloses an omni-directional vehicle anti-collision early warning system which comprises an anti-collision early warning system processing platform, a sound and light alarm display system, a camera and a remote control terminal. The remote control terminal is in signal connection with the anti-collision early warning system processing platform through a wireless communication module and monitors whether a vehicle is collided or not through wireless remote control. Lasers or ultrasonic waves and the camera are utilized to detect the distance between the vehicle and an obstacle in real time, by judging the distance change and relative speed between vehicles, the moving state of the front vehicle can be judged, thus which theoretical model, the front vehicle and the vehicle belong to, of anti-collision alarming is inferred, and the corresponding model is selected to calculate the danger alarm distance and the warning alarm distance. When the actual vehicle distance is smaller than or equal to the alarm distances, the system generates certain alarm signals to warn a driver, and the driver is reminded to carefully drive or immediately take relevant braking measures so that traffic accidents can be effectively prevented or reduced.

The invention discloses an automobile panel die design method, which comprises the following steps of: (1) establishing a corresponding theoretical model according to the geometrical structural characteristics of an automobile panel; (2) removing the structural characteristics unrelated to the deformation of a die cavity surface from the theoretical model; (3) establishing a finite element model according to the theoretical model simplified by the step (2), and simulating an automobile panel die molding process; (4) calculating the deformation of the die cavity surface after the simulation byusing a computer; (5) performing compensation design and amendment on the theoretical model obtained by the step (1) based on the deformation of the die cavity surface, thereby obtaining a model of an actual die to be machined; and (6) manufacturing the actual die according to the model obtained by the step (5). In the method, corresponding deformation compensation can be performed on the die cavity surface in a design stage so as to offset the influence of the deformation of the actual die, increase the joint degree of the die cavity surface, make the die can be designed and machined in place once, further shorten a die debugging period and reduce the manufacturing cost of the die.

The heat exchanger includes a large number of small, closely-spaced modules. Within each module of one embodiment, the fuel flows through a series of parallel micro-channels, while the air flows externally over rows of short, straight fins perpendicular to the direction of fuel flow. A theoretical model was developed to predict the thermal performance of the module for various operating conditions. To confirm the accuracy of the model, a module was constructed and tested using water to simulate the aircraft fuel.

A prediction method for thermodynamic responses and fatigue-creep damage of a high-chrome steel material is disclosed. The method includes constitutive model building, material parameter determination, numerical integration algorithm designing, damage analyzing, and the like. Compared with the prior art, the method can accurately simulate thermodynamic responses of the high-chrome steel material under different loading conditions, and can analyze fatigue, creep and fatigue-creep mutual damage of the material, thus providing a more reasonable and reliable theoretical model for service lifetimeprediction and safety design standards of supercritical generator unit components operated under complex changeable environments.

The invention belongs to the technical field of composite material prediction, and discloses a carbon fiber reinforced composite material mechanical performance prediction method based on cross-scalesimulation. The prediction method comprises the following steps: adopting a meso-finite element method, establishing a single cell prediction model of a meso-level carbon fiber composite material andpredicting the mechanical performance of the carbon fiber reinforced composite material; Based on the stiffness homogeneity method, predicting the off-axis angle and multi-angle lamination sequence and verifying the models by experiments. The invention provides a method for predicting the mechanical properties of the composite material, and the experimental results are consistent with the theoretical model.

The invention discloses a method for identifying damages of a frame structure. The method comprises the following steps: firstly, testing an undamaged frame structure, and carrying out model modification on an initial discretization model of the frame structure so as to obtain an accurate finite element theoretical model, and calculating a structural modal parameter (omega A0, phi A0); then, testing the damaged frame structure, and carrying out model analysis on the damaged frame structure so as to obtain a modal parameter (omega t2, phi t2); and finally, establishing a direct analysis method damage identification equation, and solving an unit damage coefficient Di (i=1, 2,..., n) by using front n (n is less than or equal to N) order frequencies and vibration mode variation value delta omega r (r=1, 2,..., n) of the frame structure before and after damage so as to achieve the purpose of simultaneously identifying the number, position and size of the damages existing in the whole structure. The method is suitable for the damage identification of a construction frame structure, and has the advantages of less required detection data amount, high efficiency and higher precision.

The invention discloses a measuring device and measuring method for film photo-thermal property. Based on the original surface thermal lens technology, the modulation frequency of pumping light beams is changed, so that the amplitude of detecting signals and the relationship of phase signals changed along with the frequency can be obtained. The relationship and the calculated result of the theoretical model are compared, and then some important information of the inner part of the film can be obtained. In the invention, not only can the absorption rate of the film be measured, but also the thermal conduction rate of a single-layer film and the deep indexing of some strong absorption impurities can be measured, so that the comprehensive evaluation on the photo-thermal property of the film can be conducted, and greater auxiliary action on the aspects of optimizing film coating process, seeking injury mechanisms and the like can be achieved.

The invention discloses a reservoir classification method based on rock electricity parameters, and belongs to the field of hydrocarbon reservoir evaluation. The method is based on rock electricity experiment theoretical model deduction, a theoretical value range and a value trend of rock electricity experiment data of reservoirs under different pore structures are formed, and reservoir pore structure subareas on a rock electricity data F-phi plate are formed; and corresponding electrical logging data are utilized in combination with rock electricity experiment data and mercury injection capillary pressure curve data to determine rock electricity method quantitative classifications, and the method at least includes: Step 1) establishing a rock electricity method classification bases; Step 2) forming a classification plate; Step 3) establishing a quantitative classification evaluation basis; and Step 4) determining classification grades of the reservoirs. According to the reservoir classification method based on rock electricity parameters in the invention, by checking distribution of the rock electricity data on the F-phi plate and discovering that rock samples of reservoirs of different classes fall on distinguishable different subareas on the F-phi plate, continuous evaluation knowledge can be provided, and a verification effect is good.

The invention relates to a service life evaluation method of an ultra-supercritical boiler special steel pipe welding connector. The method includes the steps of firstly: using an NSW-MOD theoretical model to determine mathematic relation between a creep damage accumulation process and crack growth rate on the basis of a crack tip creep damage accumulation process; secondly, using a polynomial to fit a da / dt-a curve to obtain a maximum curvature point, namely the turning point a of creep crack growth; thirdly, calculating to obtain the ratio a / (S-a0), namely the creep crack growth service life loss a / (S-a0) of the special steel pipe welding connector under high temperature and high pressure, of special steel pipe welding connector pipeline wall thickness S to the difference (S-a0) of S and initial crack length a0; acquiring the creep crack growth residual service life of the special steel pipe welding connector under high temperature and high pressure by numerical integration between the crack length a at the turning point and the pipe wall thickness S. The method has strict physical and theoretical basis, and service life predication is highly matched with actual service life.

The invention discloses a moving load analog loading method and device for a rail transit wheel axle. A plurality of actuators are distributed above sleepers along a rail direction, the bottom of each actuator is connected in the span middle of a distribution girder, the bottoms of two ends of the distribution girder are arranged above steel rails at two sides, two continuous steel rails are laid on the sleepers and are respectively cut into mutually independent sectional steel rails above the positions of the sleepers, and each pair of sectional steel rail and sleeper is connected by a fastening system. Vertical pressure and upward pulling force are applied on the actuators by an anti-drop external member. A stress load time travel curve of a single fastening system under the effect of the wheel axle moving at different moving speeds is determined according to a train-rail-roadbed theoretical model and is used as a load exciting curve of each actuator, and the adjacent actuators are dynamically excited sequentially in the same time interval along the moving direction of the wheel axle so as to realize the analog loading of the moving load of the wheel axle at different speeds. The invention provides a reliable and convenient loading platform for developing a rail traffic dynamic model test research.

The invention discloses a complicated surface cutting force prediction method and a method for performing parameter adjustment and tool path planning by use of the prediction method, and both the methods have generalizability and can be used for effectively reducing the model core parameter computation complexity and improving the effectiveness of an established complicated surface cutting force prediction model. The prediction method comprises the following steps: dividing a cutter-workpiece contact area into a type I only containing a cutter tip arc-shaped edge area and a type II containing a cutter tip arc-shaped area and a main cutting edge area according to the condition whether the outline of a to-be-processed surface is intersected with the arc-shaped edge or not; as for the type II containing the cutter tip arc-shaped area and the main cutting edge area, computing the total area of a cutting layer, the total length of the contact edge, the cutting layer area of the cutter tip arc-shaped edge area, the length of the contact edge and the direction angles of friction forces, obtaining correlation model parameters of the main cutting edge area by use of a subtractive method and weighting the direction angles of friction forces of the two areas, thereby obtaining the total friction force direction angle; as for the type I only containing the cutter tip arc-shaped edge area, computing the model parameters of the cutter tip arc-shaped edge area; substituting the computed model parameters into a cutting force theoretical model, thereby obtaining a cutting force predicted value.

The present invention discloses mechanical process of preparing composite nanometer ceramic / micron metal powder. The composite nanometer ceramic / micron metal powder is prepared with marketable micron and nanometer powder as material, and through establishing the theoretical model of the weight ratio between the micron powder and the nanometer powder, preparing stable suspension of nanometer ceramic powder, mixing the nanometer suspension and the micron powder, and mechanical compounding. The process has simplicity, short treating time, easy control, continuous production and other features, and is suitable for engineering application.

The invention discloses a method for suppressing multiple waves based on L1 norm multichannel matched filtering. The method comprises the steps that a predicted multiple wave channel, a Hilbert transformation channel of the multiple waves, a high-frequency reconstruction channel and translation channels of above three kinds of data are used as multiple channels to be input, so that fitting is conducted with the multiple waves in an original seismic record, and a modulation frequency expanding technology is introduced to reconstruct high-frequency components of the predicted multiple waves. According to the method, a GPU acceleration technology is introduced into an algorithm, GPU / CPU collaborative and parallel computing is used for improving the computational efficiency, and a convergent self-adapting filter is acquired quickly. The method is applied to multiple wave suppressing of a theoretical model and actual data, a test result shows that compared with a conventional L2 form matched filtering method, a high-precision multiple wave suppressing result can be obtained, and meanwhile the energy of effective waves is well protected.

The present invention discloses a frost heave force model of a rock tunnel based on a rock-water-ice force in-situ test. A pore water pressure gauge, an earth pressure box, and a multi-point platinumresistance temperature sensor are used in a combination manner to perform a frost heave force in-situ test on fractured rocks, the temporal and spatial evolution laws of the fissure water pressure, the ice pressure, and the surrounding rock pressure before and after freezing of the fractured rocks are obtained, and theoretical model calculation results, in-situ test results, and existing researchresults are compared and analyzed. According to the frost heave force model of the rock tunnel based on the rock-water-ice force in-situ test provided by the present invention, in-situ testing on siteis used, the test method is innovated outside the previous test system mainly containing the freeze-thaw cycle mechanics test of fractured rock masses, the lack of measurement methods is compensated,the frost heave force in natural water-containing cracks is obtained, and starting from macro and engineering applications, the discussion of the meso-structure and fracture geometry of fractured rocks is avoided; the general area of low-temperature water-ice phase transition and the direction of water migration are considered; and the frost heave force model of the rock tunnel based on the rock-water-ice force in-situ test provided by the present invention will provide a reference for similar projects of the currently developed Sichuan-Tibet Highway.