34results about How to "Rich design method" patented technology

The invention provides an impermeable drainage system for a cement-sand-gravel dam. The impermeable drainage system is provided with an upstream impermeable layer and a drainage layer, wherein the upstream impermeable layer is arranged on the upstream of the cement-sand-gravel dam and covers the whole upstream dam face in a laminating manner, the upstream impermeable layer is cut into a pluralityof blocks by transverse seams in the axis direction of the dam, water-stop structures are arranged at the transverse seam positions, at least one part of each water-stop structure is arranged on the surface of the upstream impermeable layer, the upstream impermeable layer is made of slurry-adding vibrating cement sand gravels or slurry enriching cement sand gravels, the drainage layer is arrangedon the downstream side of the upstream impermeable layer of the cement-sand-gravel dam and is adjacent to the upstream impermeable layer, and drainage pipes are arranged on the downstream side of thedrainage layer in the axis direction of the dam and drain leakage water penetrating the upstream impermeable layer. According to the impermeable drainage system, the cement-sand-gravel dam is more economical and environmentally friendly, and meets higher engineering design requirements for compressive strength larger than 20 MPa, anti-freeze strength meeting F300 and impervious strength larger than W10, construction is convenient and fast, the dam body impermeable effect and the dam inner drainage effect can be improved effectively, and the design method of the cement-sand-gravel dam is perfected.

The invention relates to a Marshall design method of an Evotherm warm-mix asphalt mixture, comprising the following steps: (1) selecting a Marshall design method of a warm-mix asphalt mixture to design the graduation and oil-stone ratio of the warm-mix mixture; (2) selecting aggregates with different temperatures, conducting a rutting test on the selected aggregates with different temperatures and an asphalt with same temperature of the warm-mix asphalt, and determining the discharge temperature and compaction temperature of the warm-mix asphalt with the bulk density of a test piece of the warm-mix asphalt as a standard; and (3) conducting a high temperature test, a low temperature test, and a water stability test of the warm-mix asphalt at the temperatures, and evaluating by taking technical indexes of the warm-mix asphalt of the same type. According to the invention, the warm-mix asphalt mixture can be designed without a gyratory compactor, the bulk density of the warm-mix asphalt mixture is represented as the core sample density of the rutting plate drilled core, and the technical indexes of the warm-mix asphalt of the same type are taken as the performance index for evaluation; and the design method is simple and reasonable and is convenient for laboratories and field laboratories without the gyratory compactor, thus the design method of the warm-mix asphalt mixture is expanded.

The invention relates to the technical field of structural engineering, and discloses a prestressed support friction damping assembled steel structure system and a design method. The system is formedby stacking layered frame structures up and down, each layered frame structure includes steel columns, steel beams and floor plates, the steel columns between the upper and lower adjacent layered frame structures are disconnected at the connection positions of the floor plates on the lower layer, connection through self friction is achieved, and meanwhile, high-strength cables are connected between the adjacent layered frame structures; and the top ends of the steel columns are provided with upper flange plates so as to be fixedly connected to the steel beams, the bottom ends of the steel columns are provided with lower flange plates, the lower flange plates are in contact with the upper surfaces of the floor plates of the adjacent layered frame structure on the lower layer, the upper surfaces of the floor plates are provided with friction coating layers and limiting devices, and the limiting devices are steel plate strips arranged along the edges of the floor plates. By means of the system, the layers are connected through the high-strength cables and the mutual friction between the columns, construction is convenient and efficient to achieve, and the stress performance is good.

The invention discloses a friction pendulum connected fabricated steel structure system and a design method thereof. The friction pendulum connected fabricated steel structure system comprises at least two layers of steel frame structures and a group of friction pendulum shock isolation devices; steel columns of each layer of steel frame structure are disconnected at the joint with the lower floor; the friction pendulum shock isolation devices are correspondingly arranged between the steel columns of every two layers of steel frame structures; each friction pendulum shock isolation device comprises an upper connection plate and a lower connection plate; the middles of the bottom surfaces of the upper connection plates are connected with plugging blocks; the bottom surfaces of the pluggingblocks are convex curved surfaces which are convex downwards; lugs are arranged on the top surfaces of the lower connection plates; plugging slots are formed in the tops of the lugs; the bottom surfaces of the plugging slots are concave curved surfaces which are concave downwards; the plugging blocks are correspondingly plugged in the plugging slots; the tops of the plugging blocks are higher thanthe tops of the plugging slots; and distances are reserved between the side walls of the plugging blocks and the side walls of the plugging slots. The friction pendulum connected fabricated steel structure system is capable of solving the technical problems that the existing fabricated steel structure buildings are complicated in connection joints, large in field workload and low in constructionefficiency, the joints of the frame structures are rigidly connected and the seismic resistance of the frames is relatively bad are solved.

The invention provides a control method and a device for a flywheel energy storage system. The method comprises the steps of a, with the angular velocity, the d-axis current and the q-axis current of A, a flywheel as state variables, and the energy storage capacity of the flywheel as a control variable, constructing a model for the energy storage system of the flywheel, and discretizing the model according to the sampling time; B, constructing a performance index based on a second-order Renyi entropy, and determining an optimal input control variable increment with the partial derivative of the input control variable increment to be zero based on the performance index; C, determining a current optimal input control variable based on the optimal input control variable increment. According to the control method and device, based on the simplified energy storage model of the flywheel, a controller for the energy storage system of the flywheel can be designed. Meanwhile, the excess energy of the flywheel is stored, or the deficient energy of the flywheel is supplemented. In this way, a wind turbine generator set is ensured to transmit a smoothing power to the power grid.

The invention provides a fast calculation method for a permanent magnet eddy current loss of a vehicle surface-mount permanent magnet synchronous motor. The influence of phase current harmonics on thepermanent magnet eddy current loss is considered, the quick and accurate calculation of the permanent magnet eddy current loss in a whole working area can be achieved, thus a designer can select appropriate motor structural parameters and electromagnetic parameters during the design process, the permanent magnet eddy current loss is reduced, the irreversible demagnetization of a permanent magnetis avoided, and the normal working of the motor under complex and variable working conditions is ensured. At the same time, the design method of the permanent magnet synchronous motor is improved, andthe design cycle of the permanent magnet synchronous motor is shortened.

Provided is a robust Hinf spacecraft pointing control method and system based on feature structure configuration. A controller designed by the feature structure configuration method can provide complete parameterization representation of all control laws with desired characteristics or structures for the control system, and then a reasonable constraint condition is designed according to the characteristics of a spacecraft to select free parameters in the control laws. According to the method disclosed by the invention, the satellite robust Hinf high-precision pointing control design is carriedout by mainly taking the feature structure configuration method, according to the designed closed-loop control system result, the feature value of the reasonable closed-loop system is determined andis adjusted according to the normalized structure of an existing satellite controller, the main feature value of the on-satellite closed-loop control system is consistent to that of the invention, sothat the closed-looped system has the similar motion characteristics. The in-orbit verification of the spacecraft with uncertain large-flexible structures shows that the convergence and robust stability are high, and the high-precision pointing task demand in the long-term on-orbit operation can be guaranteed, thus the reliability of the system is improved.

A prestressed assembly type steel frame friction damping structure system and a design method thereof comprise at least two layers of steel frame structures, wherein adjacent steel frame structures are disconnected at the joint of an upper-layer column and a lower-layer floor slab; the adjacent steel frame structures are connected in a sliding manner through a bidirectional sliding friction connecting device; the bidirectional sliding friction connecting device comprises an upper C-shaped plate, a lower C-shaped plate, a friction plate and a connecting piece; the plate surface of the upper C-shaped plate is provided with a first transverse strip hole; the plate surface of the lower C-shaped plate is provided with a first longitudinal strip hole; the upper C-shaped plate and the lower C-shaped plate are mutually inserted and connected with the connecting pieces in the corresponding first longitudinal strip holes through the first transverse strip holes; the upper C-shaped plate is connected with a bottom connecting plate; the lower C-shaped plate is connected with a top connecting plate; and friction plates are arranged between a first top plate and a second top plate, between a second top plate and a first bottom plate and between the first bottom plate and a second bottom plate. The prestressed assembly type steel frame friction damping structure system solves the technical problems of poor energy consumption performance and difficult construction of connecting joints of the traditional assembly type structural steel column connecting structure.

The invention discloses a satellite sensor fault detection and positioning method based on a self-encoding observer. According to the method, fault detection and positioning are carried out on a satellite attitude sensor based on a self-encoding observer. To be specific, according to an observer design based on an auto-encoder and a support vector machine system, self-coding observers are built according to a satellite attitude measurement method, inputs and outputs of the observers are compared to generate residual errors, the support vector machine is used for detecting faults according to mean values, mean square errors and information entropies of the residual errors, and detection results of the multiple self-coding observers are combined to locate fault sensors. According to the invention, fault detection and fault positioning can be carried out in combination with signals of a plurality of satellite attitude sensors, and the reliability and ground monitoring capability of a satellite attitude control system are improved.

The invention relates to a concentration distribution prediction model of water curtain diluted ammonia by considering water curtain liquid drop absorbing ammonia mass transfer. The mass transfer process between water curtain liquid drop and ammonia cloud cluster is researched based on a double-film mass transfer theory, a theoretical calculation equation of water curtain liquid drop absorbing ammonia is built, the liquid drop absorbing ammonia concentration R is built to represent the liquid drop absorbing effect, the square root of R is coupled into the smoke plume radius r on the basis thatthe parameter R is comprehensively assessed, and the concentration distribution prediction model of the water curtain diluted ammonia is built. The built concentration distribution prediction model is testified by adopting relevant experimental data, the model can accurately calculate the ground concentration of the ammonia leaked cloud cluster in the downwind direction at a natural spreading state and a forced spreading state respectively. The design method of water curtain diluted ammonia system projects is enriched, and the effect prediction errors of the water curtain diluted ammonia aredeclined. The result shows that the built prediction model can accurately predict the concentration of the water curtain diluted ammonia in the downwind direction, the deviation is within the range accepted by the project, and the prediction result is enabled to be reliable.

The present invention relates to a sort of rotary rice transplanter with many lines of moving claws for the seedlings, which includes: machine support, the left-and-right railway underpans, the principal axis, the moving claws for the seedlings, the rotary driver, the telescopic machine and the like, the left and right railway underpans are arranged at the two side of the principal axis, more than one rotary drivers are arranged at the principal axis, several telescopic machines is arranged in every rotary driver, a moving claw is connected on the telescopic machine. The moving seedling claw have a structure with double deck, three hinges and four levers, whose four disciplinary reciprocating actions include: rest interval, circumversion, expansion and random self-regulation. The present invention perfects the design theory and working performance in the moving theory and design method fields, the moving of the rice transplanter is stable when it works, the claw can simulate the rice-transplanting action of the man, and the depth of planting can random self-adjusted, so it has a good uniformity.

The invention relates to a noise suppression method and a noise suppression device based on Gaussian distribution weighting. The noise suppression method comprises the steps of determining the local radius of a filter; determining a window length of the filter according to the local radius of the filter, and determining discrete signals in the window of the filter; determining corresponding mean values and variances according to the discrete signals in the window of the filter; determining a Gaussian function of the discrete signals in the window of the filter by using the mean values and the variances; determining the corresponding Gaussian function value of each discrete signal in the window of the filter by using the Gaussian function, and performing summation of the obtained Gaussian function values; determining the corresponding weighted value of each discrete signal in the window of the filter by using the corresponding Gaussian function value of each discrete signal in the window of the filter and the sum of the Gaussian function values; and performing noise suppression treatment on the discrete signals at the center of the window by using the weighted values by the filter.

The invention provides a design method and structure for an additive manufacturing lattice sandwich structure, relates to the technical field of additive manufacturing, and can provide a feasible design scheme for preparing the lattice sandwich structure by adopting an additive manufacturing process and expand the application scene of the additive manufacturing lattice structure. According to the method, an initial structure is assumed to be a solid structure for topological optimization, then the skin thickness of the initial structure is adjusted according to a topological optimization result, then a cavity part of the adjusted structure is filled with a dot matrix through dot matrix filling optimization, and design is completed. The optimization target of topological optimization is that the strain energy of the overall structure with the weight is minimum, and the constraint conditions comprise volume fraction constraint, minimum size constraint and/or maximum size constraint; the optimization target of dot matrix filling optimization is that the rigidity of the overall structure with the weight is maximum, and the constraint conditions comprise the total mass constraint, the dot matrix target length constraint, the minimum diameter constraint and/or the maximum diameter constraint.