30results about How to "Improve boundary conditions" patented technology

The invention discloses a manual rack type dead-weight loading device for a landslide physical model test. The device comprises a bottom plate, a sliding surface adjusting mechanism and a thrust loading mechanism, wherein the sliding surface adjusting mechanism is located on the bottom plate and comprises a sliding panel, two groups of racks and gears which are mutually meshed, two transmission shafts, two groups of worm wheels and worms which are mutually meshed, two rocking handles and a guide holder; the guide holder is fixed on the bottom plate; vertical guide grooves are formed at the front part and the rear part of the guide holder respectively; one group of racks are located in the guide groove at the front part of the guide holder, while the other group of racks are located in the guide groove at the rear part of the guide holder; each group of racks and one of worm wheels are arranged on the guide holder through the transmission shafts; each worm is connected with one of the rocking handles; the front end of the sliding panel is hinged with the tops of the group of racks which are located at the front part of the guide holder, while the rear end of the sliding panel is arranged on the group of racks which are located at the rear part of the guide holder; the thrust loading mechanism comprises a loading platform; the bottom of the loading platform is in sliding fit with the top surface of the sliding panel; and the loading platform can slide along the sliding panel forth and back.

The invention brings forward a double motion freedom degree low thermal resistance locking device. Via the device, contact thermal resistance can be remarkably reduced, vibration amplitude of an LRM module can be lowered, and vibration resistance performance of the module can be improved. The device is realized via the following technical solution: a one-way wedge face fixing block (1) fixed on anangle plate, a rear wedge face block angle plate moving section (2), a double wedge face block middle angle plate moving section (3), a one-way wedge face front angle plate moving section (4), and aone-way wedge face driving slide block (5) are orderly connected in series at an interval of 3-5 millimeters via long screw rods so as to form a cuboid-shaped locking bar comprising four moving pairsconnected in series, the locking bar is mounted fixedly in L-shaped gap slot of the LRM module, all angle plate moving sections are driven spirally via screw rods (6) to gradually retract along interval gaps among all sections, staggered sliding motion is generated along a direction of a diagonal line of a cuboid, distensible force is generated between walls of gap slots of the LRM module and a cold plate (10), and double motion locking and heat transfer of the LRM module can be realized.

The invention discloses a method for post-grouting in the bottom of a pile, which comprises the following steps: in the process of constructing the pile by drilling holes, a grouting pipeline is prearranged in the bottom of the pile and grout is injected. The method has good grouting effect and high success rate of grouting.

The invention provides a dissimilar material brazing gap control method and system. The dissimilar material brazing gap control method comprises the steps of: presetting assembly gap values according to the actual structures of all workpieces to be assembled; determining performance parameters of all the workpieces; according to the brazing structures of all the workpieces and the brazing filler metal joint filling requirements, determining the positions of brazing seams and the boundary conditions of thermal structure analysis; according to the boundary conditions of thermal structure analysis and the performance parameters of all the workpieces, analyzing thermal displacement changes of all the workpieces, and working out brazing gap values among all the workpieces; performing comparison and re-calculation according to the brazing gap values among all the workpieces and a preset brazing gap range of a brazing material to obtain an optimal assembly gap range among the workpieces; and performing a process test according to the optimal assembly gap range to determine the actual assembly gap among the workpieces. According to the method, the initial assembly gap of the workpieces and the brazing gap are linked through simulation analysis, so that numerical control over the brazing gap of the dissimilar materials is achieved, and the brazing quality of products is guaranteed.

An apparatus is described for cooling a strip (1) of sheet metal with nozzles (6) for a cooling liquid to be sprayed onto the bottom side of the strip, which nozzles are arranged beneath the strip (1) in transversal rows relative to the feeding direction (3) of the strip. In order to provide advantageous cooling conditions it is proposed that the nozzles (6) configured as fan jet nozzles form a common middle spraying surface (7) for each transversal row and that covers (10) are provided in the spraying region of the nozzles (6) which are laterally adjacent to the strip (1) of sheet metal.

The invention discloses a method for calculating the stable bearing capacity of a U-shaped stiffening plate under the action of axial compression. The method comprises the following steps: step 1, assuming conditions; step 2, obtaining the total potential energy of the U-shaped stiffening plate; step 3, obtaining a flexural surface function; step 4, critical load of the stiffening plate; step 5, determining elastic constraint rigidity; and step 6, comparing the theoretical solution with an ANSYS numerical solution. The invention aims to provide the method for calculating the stable bearing capacity of the U-shaped stiffening plate under the action of the axial compression, the stable bearing capacity of the U-shaped stiffening plate under the action of the axial compression can be more accurately simulated and calculated, the maximum error is 0.42%, and the result coincidence is better.

The invention discloses a metal shearing type damper structure form. The metal shearing type damper structure form comprises a core plate lower end special-shaped connecting section, a middle sectionenergy consumption section capable of controlling a core plate to be reasonable in slenderness ratio, a core plate upper end special-shaped connecting section and flange plates on the two sides, the upper section, the middle section and the lower section of the core plate are formed by integrally machining a mild steel plate, it is guaranteed that steel performance of the energy consumption section is fully exerted, and stress is reasonably transmitted. Under the same load, the size, the weight and the manufacturing cost of a damper are greatly reduced, accurate simulation can be carried out through numerical simulation, consistency of damper unit parameters in an actual product and the overall structural design is kept, and the metal shearing type damper structure form is wide in application range, efficient and reliable.

The invention relates to a meshless method seepage free surface solving method based on a radial base point interpolation method. The meshless method seepage free surface solving method comprises thefollowing steps: 1) determining a control equation; 2) determining boundary conditions; 3) determining an RPIM control equation; solving a partial differential equation by adopting RPIM, dispersing aproblem domain into a series of field nodes, introducing an integral rigidity matrix into a background grid in order to facilitate integration and assembly, integral points existing in the backgroundgrid, each integral point having a support domain, and interpolating the field nodes in the support domains to obtain information on the integral points. According to the method, the seepage free surface can be solved conveniently and quickly, the precision is high, the working process can be simplified, and engineering practice can be better guided.

The invention relates to a desulfurization catalyst. The desulfurization catalyst contains the following components in parts by weight: 15-20 parts of aluminum chloride, 5-15 parts of urea, 10-15 parts of ammonium nitrate, 10-15 parts of nickel nitrate and 10-15 parts of aluminum oxide. According to the desulfurization catalyst, boundary conditions of the reaction between limestone slurry and SO2can be effectively improved, the desulfurization process of the reaction can be intensified, the desulfurization efficiency can be improved, the adaptability of a desulfurization system for the changeof sulfur content of fire coal can be improved, the energy consumption can be reduced, and the standardized discharge of SO2 in exhaust gas can be guaranteed.

The invention discloses a fluorine-modified acrylic resin composite anticorrosive coating preparation process and device. The preparation device comprises a device case, one side of the device case is fixedly connected with an air cylinder base, the inner side of the air cylinder base is fixedly connected with a coating conveying pipe, and the upper end of the coating conveying pipe is fixedly connected with a spray head filling mechanism. According to the fluorine-modified acrylic resin composite anticorrosive coating preparation process and device, a connecting box, an adjustable barrel cover placing mechanism and a multi-application cover pressing mechanism are arranged, filling barrels with different sizes can be conveniently covered by adding the adjustable barrel cover placing mechanism, one barrel has one cover through a movable cover fixing plate and a flap wheel, the covering size can be changed by adjusting the movable cover fixing plate, barrel covers of special sizes can be effectively sealed and packaged by additionally arranging the multi-application cover pressing mechanism, cover pressing is conducted by adjusting a telescopic pressing assembly and a telescopic connecting rod according to different sizes, and the air tightness of cover pressing and packaging is improved.

The invention discloses an LBM computational domain planning method based on image recognition, which surpasses the limitation that a mathematical expression required by a traditional specified computational domain expresses a computational domain and boundary conditions, and can divide the computational domain into an integer matrix containing predefined label information based on any closed image (engineering image or actual experimental image). According to the method, after a closed image is input, a plurality of regions are automatically divided through a series of preprocessing, pixel points in the regions can be selected, a drainage basin and a wall surface region are planned according to a predefined integer label, pixel points near the edge of the image are selected to automatically identify a boundary entrance and exit, and planning is also carried out according to a predefined integer. Finally, a matrix with various predefined integer information is output, and different regions and entrances and exits are distinguished by different integers, so that corresponding boundary conditions can be defined according to the predefined integers when the LBM method is used.

A method for determining a basic boost pressure of a gas conducting system of an internal combustion engine with a turbocharger that has a compressor, a turbine, a shaft connecting the compressor and the turbine, and a turbocharger actuator for varying a flow velocity through the turbine or a pressure ratio across the turbine. The method comprises calculation of an exhaust gas back pressure at the open turbocharger actuator position, wherein the flow velocity through the turbine or the pressure ratio across the turbine is minimal in the open turbocharger actuator position, and determination of the basic boost pressure as a function of the calculated exhaust gas back pressure at the open turbocharger actuator position. An engine controller for carrying out a method for determining a basic boost pressure is also provided.