45results about How to "Rigorous theory" patented technology

This invention relates to one complex mixture control structure flow SVA value analogue method, which comprises the following steps: simulating the complex mixture control structure by drainage structure and adopting rough network unit to form limit element module; describing the latent overflow boundary and engine mixture control structure boundary as Signorrini compensation condition to solve boundary overflow point accurately positioning problem; by self-adapting penal Heaviside function to solve the position problem of the overflow free page.

The invention discloses a 3D pavement generation method applicable to a virtual prototype system. The method comprises the following steps: the first step, establishing a 3D random pavement elevation model of a fast Fourier transform (FFT) algorithm based on a single-point FFT pavement roughness random excitation time domain model; the second step, programming a general program of the FFT 3D pavement model in MATLAB software, and selecting the pavement of a specific level to simulate the pavement roughness according to needs, thus obtaining coordinate data of the 3D pavement; the third step, establishing a generalized pavement file which is applicable to common multibody dynamics software: establishing a general model which generates the 3D pavement file and comprises the node generation and the unit generation algorithm, thus compiling the coordinate data of the 3D pavement obtained in the second step into a pavement file that can be identified by virtual prototype simulation software; and the fourth step, performing virtual prototype modeling simulation. The method has faster computation speed of the 3D FFT model, and is more suitable to the research requirements of multi-dimensional complicated systems, real-time systems and the like.

The invention discloses a high-precision registration method for a ground laser radar and a close-range photography measurement data. The method comprises the following steps: obtaining multiple close-range photographic images of a scanned object and obtaining a three-dimensional point cloud of the scanned object by a ground laser radar; carrying out SIFT feature extraction and matching based on the pyramid image of the multiple close-range photographic images and generating a free network model of the scanned object according to the matched result; carrying out bundle adjustment on the free network model by using feature points of the three-dimensional point cloud and the image as control points so as to realize coarse positioning on the multiple close-range photographic images; on the basis of a three-dimensional point cloud depth image model generated by point cloud sampling based on the uniform grid of the reference surface of the three-dimensional point cloud, completing prediction and dense matching of corresponding image points of two adjacent close-range photographic images among the multiple close-range photographic images and generating an image point cloud of the scanned object; and carrying out ICP loop iteration registration on the obtained three-dimensional point cloud and image point cloud of the scanned object to realize high-precision registration.

The invention discloses a real-time monitoring rapid initialization method for a bridge based on GNSS, and the method comprises the steps: S100, constructing a double-difference observation equation on the respective frequencies of a Beidou tri-frequency signal; S200, linearizing the double-difference observation equation and constructing an error equation; S300, applying reference constraint on ato-be-estimated parameter through prior information, and weighting the double-difference observation equation through a random mode; S400, solving an error equation through a Kalman filter method, and obtaining a floating point solution estimation value of an ambiguity parameter; S500, carrying out the ambiguity search through an LAMBDA method based on a monitoring station coordinate estimation value and the floating point solution estimation value; S600, repeatedly executing the steps S400-S500 for the next epoch. According to the short baseline data processing characteristics of bridge deformation monitoring, the method employs the Beidou tri-frequency signal for building a superwide-band combined observation value with the wavelength of 4.88m, greatly improves the ambiguity fixing efficiency, and speeds up the initialization process in the real-time monitoring of the bridge.

The invention discloses an inner tube drawdown double-tube method for determining the outer tube aquiclude hydrogeological parameter in site. According to the method, firstly, an inner tube drawdown double-tube test model with the determined outer tube aquiclude hydrogeological parameter is formed in site; on the basis of the double-tube test model, a flow rate formula analytic solution of the outer tube aquiclude unit level area under the conditions that an inner tube water head is reduced by a certain constant (the water level is not lower than the top surface of the aquiclude) but the underground water level at one side of an outer tube aquiclude post body keeps unchanged is deduced; then, experiment data based on measurement of the change of the flow rate of a Marriotte bottle at the upper part of the outer tube along with time is given; a wire fitting method is used for determining the aquiclude conduction coefficient, the seepage coefficient and the water storage rate. The method provided by the invention has the advantages that the operation is easy; the obtained parameters are many; the precision is high; the technical problem that the aquiclude hydrogeological parameter cannot be determined in situ in site in the prior art is solved; the defect of errors during test in laboratories after the sampling in site is overcome; good popularization and application values are realized.