38results about How to "Simple math" patented technology

The invention relates to a partial-compensation aspherical reflector surface shape detection method, which comprises the following steps of demarcating partial-compensation elements to obtain demarcated phase distribution Wb; using the demarcated phase distribution Wb, sphere theory wavefront Wq and aspherical theory wavefront Wf to obtain phase distribution Wy of digital virtual sample plates; measuring an aspherical reflector surface to be measured to obtain phase distribution Wa; and reducing the phase distribution Wy from the measured phase distribution Wa to achieve surface shape error distribution Wm of the aspherical surface. The partial-compensation aspherical reflector surface shape detection method can accurately measure optical aspherical surface shapes by using a single partial-compensation element, thereby reducing design difficulty of a compensator, simplifying structure of the compensator and being clear in physical definition, simple in data processing and arithmetical operation, simple and practical in experimental operation, low in detection cost and short in test time.

The invention relates to a method for detecting a nonzero digit compensation light-degree optical non-spherical profile. The method comprises the following steps of: calculating the value of z(x, y)-s(x, y, r), wherein z(x, y) is the rise distribution of an aspheric surface along the direction of an optical axis, and s(x, y, r) is the rise distribution of a spherical surface closest to the aspheric surface to be detected along the direction of the optical axis; converting emergent parallel light of an interferometer into standard spherical waves by utilizing a transmission ball and using the standard spherical waves as reference spherical waves; adjusting the position of the aspheric surface to be detected to ensure that the circle center of the spherical surface closest to the aspheric surface to be detected coincides with a focus point of converging the reference spherical waves; detecting phase distribution data of interference fringes formed by the optical waves reflected by the aspheric surface to be detected and the reference spherical waves by utilizing the interferometer; and rejecting the value of the z(x, y)-s(x, y, r) and an adjusting and positioning error epsilon (x, y) from the phase distribution data of the interference fringes to obtain the profile error distribution e(x, y) of the aspheric surface. The invention can realize the detection of large-caliber concave and convex light-degree aspheric surface profiles with high resolution and high precision and has the advantages of low detection cost and short detection cost.

The invention provides a method for pressurizing and molding a composite part by using thermal expansion of silicon rubber, which applies the relations among product thickness, process gaps and thickness of a silicon rubber layer to a molding die of the composite part, and realizes molding and curing of the composite product by heating of an autoclave and a curing furnace and expansion and pressurization of the silicon rubber. Compared with the prior art, the method is suitable for different composite parts and different die materials, simultaneously meets the technical requirements of the geometric dimension of the composite part, the porosity of a laminate part, expansion pressure of the silicon rubber and the like, simplifies arithmetical operation, and contributes to designing of various molding dies of composite laminate parts, thus has extremely practical value.

The invention discloses a wave type dynamic data reconstruction method based on a singular boundary method. A wave equation time elementary solution is directly used as a kernel function, a source point intensity factor is used for replacing a source point singular item, no numerical value integrals, no singular integrals and no mesh generation are related, the wave equation time elementary solution is directly used as the kernel function, no complex mathematical manipulation exists, and the simple and efficient characters meet the feature requirements of wave type dynamic data reconstruction for quickness, stability and precision of the data reconstruction technology. Experiment comparisons show that when the technology is used for processing the wave type dynamic data reconstruction problem, under the condition of obtaining the similar precision, generally, only about 10% of time taken by a traditional linear boundary element algorithm is consumed, and the method has the advantages that the precision is high, calculation is quick, mathematics is simple, and the procedure is simple and convenient to conduct and can be applied to the engineering technical fields such as sound wave noise reduction, sea wave energy dissipation, earthquake prediction and other wave type data reconstruction and image processing.

The invention relates to the technical field of dispensing, in particular to a camera module dispensing system based on a turntable. The system comprises an acquisition module, an object module, a target module, a calculation module, a correcting module and a dispensing module. The acquisition module is used for acquiring dispensing path information according to a preset dispensing path; the object module is used for acquiring object image coordinates of object mark points in real time; the target module is used for acquiring target image coordinates of target mark points in real time; the calculation module is used for calculating the coordinate deviation amount of the object platform coordinates and the target platform coordinates under a platform coordinate system in real time; the correcting module is used for correcting the dispensing path in real time according to the coordinate deviation amount and updating the dispensing path to obtain an updated dispensing path; and the dispensing module is used for carrying out dispensing according to the updated dispensing path information. The technical problems in the prior art that the dispensing path cannot be corrected immediately in real time when the dispensing path is changed, and the deviation of the dispensing path cannot be corrected in real time are solved.

The invention provides an electronic non-stop toll collection method capable of preventing toll evasion, which can be applied to an ETC system. The method includes the following steps of: detecting the state of a vehicle entering an ETC lane; detecting the height of the vehicle entering the ETC lane and storing the height into a memory; detecting a type of the vehicle entering the ETC lane through an on-board electronic tag detector; performing vehicle determination and decision, i.e., determining the type of the vehicle entering the ETC lane according to preset height pre-determined values of various vehicle types and a detection result of a raster detector; and comparing the vehicle type of a determined result with the vehicle type detected by the on-board electronic tag detector, and deciding an intercept signal and an intervention alerting signal based on a comparison result. The invention also relates to an electronic non-stop toll collection system capable of preventing toll evasion. The method can decide the intercept signal and the intervention alerting signal based on the comparison result of the vehicle type determined by the actual vehicle height and the vehicle type detected by the ETC system rather than only electronic tag identification, and can effectively prevent toll evasion.

The application discloses an EOS-ELM-based piezoelectric driving positioning platform modeling method and system, and an EOS-ELM-based piezoelectric driving positioning platform control method. According to the application, by taking the current desired output displacement, a plurality of previous output displacements and an input driving voltage as the input values of a model, and taking the input driving voltage value of a piezoelectric driver at the current moment as an output value of the model, a hysteretic nonlinear multi-value mapping problem is solved, and a complicated model inversion process can be avoided; secondly, the weights and the threshold values between a hidden layer and an input layer are given randomly, and a conventional neural network can be transformed into a linear equation model, so that the training time of the model is shortened greatly; thirdly, an infinite differentiable function is used as a hidden layer activation function, so that an excellent training effect can be realized; additionally, just by adopting a recursive least square method, the parameter online adaptive updating can be realized, and the applicability of the model is improved; furthermore, by integrating a plurality of weak learning machines, the precision and the stability of the model can be improved.

The application discloses an FReOS-ELM-based piezoelectric actuation type FTS modeling method and system and control method and system. According to the application, a current expected output displacement value, a plurality of previous output displacement values, and input driving voltages are used as input values of a model and an input driving voltage value of a piezoelectric ceramic actuator component at a current time is used as an output value of the model, so that a hysteresis nonlinear multi-value mapping problem is solved and a tedious model inversion process is avoided. Besides, the model is converted into a linear equation model, so that the training time of the model is shortened greatly. And the precision is improved by using an infinitely differentiable function as a hidden-layer activation function. Moreover, on the basis of the regularization idea, a proportional parameter of a risk is introduced to avoid ill-conditioned matrix generation, so that the training stability and generalization performance of the model are improved substantially; and because of introduction of a forgetting factor for online adaptive parameter updating, the operation becomes convenient, the computing loading and information overloading phenomena are avoided and the adaptability of the model is enhanced.

The invention relates to a method for setting and judging break beads for parts by draw forming. The method comprises the following steps: firstly, determining two sections of which the section difference is larger and the spacing between the sections is L; secondly, determining the section arc lengths between two profiled outlines are L1 and L2 and plan ranges between the two profiled outlines are a1 and a2; thirdly, calculating unilateral inflow volume of section materials: b1=(L1-1.06a1)/2,b2=(L2-1.06a2)/2, wherein 1.06 is the plastic deformation ratio of the section materials; fourthly, working out theta, according to a formula: tan theta is equal to |b1-b2|/L; and fifthly, setting a single reinforcement if the theta is less than 7 DEG, setting a double reinforcement if the theta is more than or equal to 7 DEG and less than or equal to 15 DEG, and providing design alteration of a product if the theta is more than 15 DEG. The method has simple mathematical calculation, less steps and amount of calculation, and fast and accurate determination; and the determination does not exceed ten minutes.

The invention discloses a sponge city optimal layout and comprehensive benefit evaluation method, relates to the technical field of environmental engineering, and aims to solve the problems of relatively outstanding planning efficiency, poor planning accuracy and large planning effect error in existing sponge city planning. Decision variables selected by the project scientifically and reliably includea green roof area, a permeable pavement area, a concave green land area, a bioretention pond area, a grassed swale area and a rainwater garden area respectively; and the objective functions comprise an LID facility total construction cost function, a rainwater annual comprehensive runoff coefficient function and an LID system comprehensive pollutant control rate function. A decision maker can select decision schemes under different target preferences by comprehensively considering factors such as cost, water quantity and water quality according to main problems and contradictions in a transformation area, and a decision thought is provided for constructing various LID facilities according to local conditions.

The invention discloses a voltage sag source identification method. The method comprises the following steps: acquiring original voltage sag waveform data; processing the original voltage sag waveformdata to obtain a voltage sag waveform data queue; and inputting the voltage sag waveform data queue into a neural network model for judgment to obtain an identification result of the original voltagesag waveform data. In the embodiment of the invention, the specific fault type of the voltage sag source can be quickly and accurately identified, and an important basis is provided for formulating avoltage sag treatment scheme and dividing responsibilities of voltage sag events.