12results about How to "The calculation formula is simple" patented technology

The invention relates to the technical field of civil engineering, and particularly discloses a tunnel early-high-strength rock anchoring and shotcreting synergistic effect bearing arch active support design method which comprises the following steps: determining a rock anchor bearing arch acting load and establishing a rock anchor bearing arch calculation model; calculating to obtain the most unfavorable section displacement and stress of the rock anchor bearing arch; verifying whether the displacement of the rock anchor bearing arch meets the requirement; a safety evaluation method of the pre-stressed anchor rods is provided, and the safety of the pre-stressed anchor rods is evaluated according to a rock anchor bearing arch calculation result; establishing a sprayed concrete calculation model; calculating to obtain the most unfavorable section displacement and stress of the sprayed concrete; a sprayed concrete safety and durability evaluation method is provided; active support parameters are determined according to the calculation result of the rock anchor bearing arch and the calculation result of the sprayed concrete. By means of the method, the safety and durability of rock-anchor-shotcrete active supporting under different supporting parameters can be simply, rapidly and accurately calculated, reference is provided for tunnel engineering design adopting active supporting, and good engineering value is achieved.

The invention relates to the technical field of civil engineering, and particularly discloses a railway tunnel high-performance active support system design method considering a space-time effect, which comprises the following steps: S1, establishing a tunnel early-strength and high-strength sprayed concrete layer calculation model; s2, determining calculation parameters required by the sprayed layer calculation model according to the tunnel early-high-strength sprayed concrete layer calculation model; s3, influence factors of surrounding rock deformation pressure borne by the tunnel early-strength and high-strength sprayed concrete layer are determined; s4, establishing a surrounding rock deformation pressure calculation method of the tunnel early-strength and high-strength sprayed concrete layer considering the surrounding rock level; and S5, establishing a surrounding rock deformation pressure calculation method of the tunnel early-strength and high-strength sprayed concrete layer considering the rock mass quality index. By adopting the railway tunnel high-performance active support system design method considering the space-time effect, the safety of the tunnel early-strength and high-strength sprayed concrete layer under different time, geological conditions, construction levels and support design parameters can be simply, quickly and accurately calculated.

The invention relates to the technical field of civil engineering, and particularly discloses a tunnel rock anchor bearing arch numerical calculation method considering mechanical parameter changes of surrounding rock, which comprises the following steps: establishing a tunnel rock anchor bearing arch numerical calculation model to carry out numerical calculation in the ith step; traversing all units in the model; extracting a corresponding stress component and a centroid coordinate of each unit and then calculating a radial stress of each unit; calculating a mechanical parameter update value of each unit; judging whether each unit participates in numerical calculation of the ith step or not; if so, endowing the unit with updated mechanical parameters, otherwise, keeping the mechanical parameters unchanged; judging whether the i-step numerical calculation of the numerical model is converged or not; if convergence occurs, the calculation process is ended, and otherwise, numerical calculation of the (i + 1) th step is carried out. According to the method, in the numerical calculation process of the tunnel rock anchor bearing arch, the change of surrounding rock mechanical parameters along with the change of surrounding rock stress is considered, reference is provided for the design of tunnel engineering supported by anchor rods, and the method has good engineering value.

The application relates to a deep-sea shadow zone target distance and azimuth fast high-precision estimation method. First, a large-aperture horizontal array is divided into two sub-arrays with a certain horizontal interval, and target azimuth estimation is performed on array receiving signals of the two sub-arrays; second, based on target azimuth estimation results of the two sub-arrays and geometric relation with the target, the sound line propagation distance of the target is estimated, and the sound line propagation distance is converted into the horizontal distance between the target and the receiving array through a virtual source model; finally, the horizontal distance obtained is utilized to correct the horizontal array system direction-finding error in combination with geometric knowledge. Compared with a traditional two-station direction-finding cross positioning method, the positioning precision of the method is higher. The basic principle and implementation scheme of the method are verified through computer numerical simulation, and the result shows that in a typical deep-sea environment, the method can effectively estimate the distance and azimuth of a near-sea surface target.

The application provides a design method of a soil-rock combined foundation pit hanging foot pile supporting structure, the hanging foot pile supporting structure comprises a supporting pile and a reserved rock shoulder in a pit, and the design method comprises the following steps: a semi-infinite rock mass and an actual finite rock mass model are established by means of finite element software, a uniform load is applied to the rock mass model, the horizontal resistance coefficient of the rock mass is calculated and the reduction coefficient of the finite rock mass is obtained by comparison, and the reduction coefficient is substituted into a specification method to calculate the horizontal resistance coefficient of the finite rock mass in design; the supporting pile displacement, passive resistance safety factor, anti-overturning and anti-sliding checking are completed by using Lizheng deep foundation pit software, the suitable rock-embedded depth is determined, the pile reinforcement is determined according to the shear force and the bending moment calculated by the software; and the shear resistance and tensile resistance bearing capacity of the reserved rock shoulder in front of the pile are checked, and the rock shoulder width is determined. The passive resistance effect of the reserved rock shoulder in front of the pile is fully considered, the rock-embedded depth of the supporting pile can be effectively shortened, the supporting cost is saved, and certain economic benefits are obtained.

The application discloses a kind of elastic rigidity prediction methods of reed-bamboo-steel splint bolt connection node, and it is related to reed bolt connection technical field.The application is based on infinite body elastic foundation beam theory and is simplified, and an elastic rigidity calculation method suitable for reed-bamboo-steel splint bolt connection node is proposed, the method optimizes calculation parameters, so that it is simple in calculation process, so as to simply and quickly predict the elastic rigidity of reed-bamboo-steel splint connection form in the design process, increase the safety of this kind of connection design.The application can well solve the problem that the connection stiffness of steel splint connection form is difficult to calculate, and the connection stiffness can be calculated directly according to the structural design when reed-bamboo-steel splint bolt connection is adopted, which provides a reference for the design of this kind of connection.

This invention discloses a joint scheduling optimization system and method for energy storage and frequency regulation markets, considering the electrochemical-aging coupling characteristics of energy storage, and relates to the field of energy storage. The method simplifies the calculation formula for terminal voltage by ignoring the effect of capacitance in the equivalent circuit, and linearizes the relationship between the open-circuit voltage and state of charge, as well as the internal resistance characteristics of the energy storage system, thereby effectively reducing model complexity. Simultaneously, it utilizes sequential convex programming techniques to successively approximate the non-convex optimization problem, significantly improving solution efficiency and computational accuracy. This method not only accurately characterizes the dynamic behavior of energy storage systems under different scenarios but also provides a more operational optimization scheme for practical engineering applications. Furthermore, by linearizing the power constraints, the scalability and adaptability of the model are further enhanced, making it more suitable for the actual needs of multi-scenario joint scheduling.

The present invention provides a method for determining the rock blasting vibration safety factor based on the particle vibration velocity, and relates to the technical field of engineering blasting. The method first monitors the vibration velocity of the particle during on-site blasting to obtain the maximum vibration acceleration of the particle; and obtains the wave velocity of the rock mass and the static physical and mechanical parameters of the rock; then performs rock mass quality classification and estimates the static mechanical parameters of the rock mass; calculates the dynamic strain tensor of the rock mass, the dynamic strain rate of the rock mass and the dynamic uniaxial tensile strength of the rock mass; calculates the minimum dynamic principal stress of the rock mass based on the elastic constitutive model; and finally, according to the rock mass tensile strength theory, selects the maximum value of the minimum dynamic principal stress of the rock mass and the dynamic uniaxial tensile strength of the rock mass to calculate the blasting vibration safety factor. The method is based on the principle of mechanics and comprehensively considers the physical and mechanical parameters of the characteristic protection object. It can quantitatively describe the influence of blasting vibration on the specific protection object and determine the actual blasting vibration limit and safety factor of the specific protection object.

The invention relates to a safety assessment method for a web-stiffened high-strength steel cold-formed thin-walled C-shaped section perforated component, and belongs to the technical field of structural engineering. According to the safety assessment method for the web-stiffened high-strength steel cold-formed thin-walled C-shaped cross-section component, the influence of web tapping on the axial bearing capacity of the stiffening component under the action of axial pressure is studied for an LQ550 hot-dip aluminum-zinc high-strength steel cold-formed thin-walled C-shaped cross-section component with the wall thickness t not exceeding 1.5 mm, and the safety assessment of the web-stiffened high-strength steel cold-formed thin-walled C-shaped cross-section component is realized. On the basis of a large number of loading tests and nonlinear finite element calculation, the axial pressure bearing capacity ratio of members with different sizes and with or without web holes is obtained, and a calculation formula of the axial pressure bearing capacity reduction coefficient gamma J is obtained through least square fitting. And obtaining a calculation formula of the axial pressure bearing capacity Nu of the steel member with the perforated web plate based on the axial pressure bearing capacity of the steel member with the stiffened web plate and the reduction coefficient gamma J of the axial pressure bearing capacity.

The invention relates to the field of gear detection technology and compensation for gear grinding, and specifically to a pitch measurement and compensation method in the gear grinding process. In view of the fact that the pitch measurement on the machine in the current gear grinding process takes too long, and the pitch error is difficult to be effectively compensated in the grinding process, in order to improve the pitch accuracy and efficiency in the gear processing of a forming gear grinding machine, a single-side pitch measurement scheme in the same direction of rotation and feeding of a turntable in the grinding process is proposed in the forming gear grinding process, and a C-axis (turntable) micro-compensation method for the grinding process is performed based on the accumulated error of the single-tooth pitch. The method is mainly used in the gear processing process of the forming gear grinding machine, and the basic steps are: after the grinding of a single tool-feeding process is completed, the accumulated error of the single-tooth pitch rotating in the same direction of the turntable in the grinding process is measured, and the compensation value is added to the next tool-feeding grinding process through reverse compensation, thereby improving the pitch accuracy and efficiency of the forming gear grinding process.

The invention belongs to the technical field of aircraft control stability design, and particularly relates to a method and system for determining an elevator trim additional deflection angle after aircraft cargo putting, and the method comprises the steps: 1, calculating the weight change of an aircraft after cargo putting, and calculating the weight change of the aircraft after cargo putting; a generated elevator balancing additional deflection angle delta e1; step 2, calculating an elevator trim additional deflection angle delta e2 generated by the change of the center of gravity of the aircraft after the cargo is thrown; 3, the elevator balancing additional deflection angle delta e1 generated by aircraft weight change after the goods are thrown and the elevator balancing additional deflection angle delta e2 generated by aircraft gravity center change after the goods are thrown are synthesized, and the elevator balancing additional deflection angle delta e is obtained.

The invention relates to the technical field of geological exploration, and particularly discloses a rockburst identification method and system and a medium. According to the rockburst identification method provided on the basis of rock mass structural surface property ground stress characteristics and dynamic disturbance, the identification of the occurrence position and potential scale of strain type and structural surface type instant rockburst is realized by using mathematical space vector calculation from the nature of the strength of the rock mass and the stress state of the rock mass; according to the method, judgment is carried out through quantitative calculation, the accuracy is better, breakthrough of accurate position and potential scale calculation of rockburst in the tunnel cavern is achieved, meanwhile, the method is not limited by lithology and tunnel cavern types, accurate calculation can be achieved, calculation can be continuously carried out in the tunnel excavation process, limitation of monitoring equipment is avoided, and the method is suitable for popularization and application. The method is simple in calculation formula and wide in application range.