10 results about "Statically indeterminate" patented technology

A method for eliminating redundant force disputes in an over-determined system relates to the field of automatic control technology. It solves the problems of poor control system accuracy, high noise, and low static output caused by redundant force disputes in existing over-determined systems. The method includes: constructing an over-determined system, wherein the over-determined system includes: a conventional rigid body position loop and a redundant force control loop; obtaining a rigid body posture decomposition factor according to the over-determined system; calculating a rigid body posture synthesis factor according to the rigid body posture decomposition factor; calculating a deformation posture decomposition factor according to the rigid body posture synthesis factor; generating a position correction control signal according to the redundant force controller and the deformation posture decomposition factor; generating a position loop control signal according to the posture controller and the rigid body posture decomposition factor; superimposing the position correction control signal and the position loop control signal as the input signal to excite the system, thereby completing the elimination of redundant force disputes. It is applied to the control of over-determined systems in ground test equipment in the fields of transportation, aerospace, civil engineering, etc.

The application discloses a beam structure damage identification method of an exponential optimization modal strain energy method, and steps are as follows: (1) a plurality of mode shape curves before and after beam structure damage are obtained through dynamic testing respectively; (2) the mode shape curvature before and after beam structure damage is calculated by using a central difference method, and then the mode shape curvature curve after damage is adjusted by using an optimal matching method; (3) the mode shape curvature before beam structure damage is subtracted from the adjusted mode shape curvature after damage for a statically determinate structure, and damage positioning is carried out by using mode shape curvature difference curve mutation synthesis for a statically indeterminate structure; (4) the mode shape curvature of a unit is calculated by using the mode shape curvature before beam structure damage and the adjusted mode shape curvature, and damage degree quantification is carried out by using the exponential optimization modal strain energy method. The application can accurately identify the damage position and damage degree of a beam structure, is suitable for different beam structure damage identifications, provides an effective new method for beam structure damage identification, and can be applied to bridge damage evaluation.

This invention discloses an advanced positioning algorithm that, by constructing a statically indeterminate linear equation system, can efficiently integrate data from various stations in a large-scale distributed positioning system and accurately determine the target location in a single calculation. Its innovation lies in utilizing the transformation relationship between polar and rectangular coordinate systems to directly construct a boundary value equation containing mixed variables based on the path difference equation. Through appropriate equation transformation and variable substitution, the algorithm achieves linearization of the boundary value equation, significantly simplifying the calculation process. Furthermore, addressing the decisive influence of the path difference construction method or matrix construction strategy on positioning accuracy, this invention proposes unique path difference construction rules or coefficient matrix construction methods. These rules and methods ensure highly accurate positioning results in practical applications. The new algorithm is not only simple but also significantly improves positioning efficiency, bringing a revolutionary change to large-scale distributed positioning.

The application belongs to the field of bridge health monitoring and rapid detection, and discloses a bridge bending stiffness identification method based on multi-point deflection influence line input, and steps are as follows: firstly, a linear model for solving bending stiffness is established by using measured deflection influence lines at multiple positions of a bridge and linear elasticity theory; then, a redundant dictionary composed of multiple types of global basis functions is used for sparse representation of the bending stiffness distribution curve, and the bending stiffness reconstruction problem is converted into a sparse vector solving problem; finally, a sparse vector solution model with 1-norm regularization constraint is established, and the optimal bending stiffness distribution is obtained by solving the model. l The application can realize continuous bending stiffness curve solving by using multi-point measured deflection influence lines only, is suitable for stiffness evaluation of statically indeterminate in-service bridges such as continuous girder bridges, and has the advantages of strong applicability, high solving efficiency and strong robustness.

The application discloses a railway passenger car whole vehicle completion method based on an explicit dynamic integral method, and comprises the following steps: obtaining the parameters of materials to be matched with a railway passenger car whole vehicle to be completed; constructing a statically indeterminate balance model of the railway passenger car whole vehicle to be completed, and obtaining the displacement response of the statically indeterminate balance model; calculating first theoretical pad parameters according to the displacement response and the completion requirements of the railway passenger car whole vehicle; inputting the parameters of the materials to be matched into a full connection feedforward neural network, and obtaining second theoretical pad parameters; constructing a linear regression model, combining the first theoretical pad parameters and the second theoretical pad parameters, and outputting the combined parameters as pad parameters to be added; and guiding the railway passenger car whole vehicle to be completed according to the pad parameters to be added. The application can more accurately calculate the required pad parameters, improve the completion precision, reduce repeated operations, and improve the production and maintenance efficiency; through data analysis and machine learning technology, the application can adapt to various physical changes that may occur in the long-term operation of the railway passenger car.

To provide a method for selecting a reinforcing place of an statically indeterminate structure, which enables a column to be reinforced to be properly selected in view of the whole statically indeterminate structure.SOLUTION: This reinforcing place selecting method of the statically indeterminate structure selects a column to be reinforced with the statically indeterminate structure having a plurality of columns and slabs made of reinforced concrete as an object. The method includes a step (S3, S5, S51) of selecting a column that causes a decrease in load of the statically indeterminate structure by using a material damage indicator of concrete of the column calculated by nonlinear finite element analysis using an analysis model of the statically indeterminate structure to be reinforced, and a step (S6, S7) of performing nonlinear finite element analysis again using an analysis model after reinforcement of the selected column and checking a reinforcement effect of the entire statically indeterminate structure based on a result of the nonlinear finite element analysis after reinforcement.SELECTED DRAWING: Figure 1

The invention discloses a reliability analysis method for a bar system structure system without searching a failure mode. The method comprises the following steps: firstly, exporting an elastic stiffness matrix according to a finite element model of a structure, and outputting internal forces of all units; deducting the contribution of the section of a part of rod pieces needing to bear internal force in the structural elastic stiffness matrix, and constructing a virtual stiffness matrix of the rod system structure; eigenvalue decomposition is conducted on the structure virtual stiffness matrix, the minimum eigenvalue of the structure virtual stiffness matrix is output, and the minimum eigenvalue serves as a performance function for judging the failure of the structure system; solving a probability density function of the performance function; and finally, calculating the system reliability and the failure probability of the rod system structure. According to the method, the minimum characteristic value of the virtual stiffness matrix of the structure is used as a performance function for judging the failure of the structure system, the failure mode and correlation analysis of the structure are avoided, a key problem in the reliability calculation of the high-order statically indeterminate rod system structure is solved, and the method is suitable for the reliability analysis of the high-order statically indeterminate rod system structure.

A method for simulating statically indeterminate boundary of static test of a component with connecting joint parts, comprising: performing finite element analysis of actual state of the component; performing finite element analysis of each connecting joint hinge constraint state on the boundary of the component; if the deviation of each connecting joint node force and element strain on the main force transmission path in the actual state of the component and the connecting joint hinge constraint state on the component exceeds the set deviation value, then: on the basis of the connecting joint hinge constraint state on the boundary of the component, releasing displacement constraint of part of the connecting joints in part direction according to relative deformation of each joint in the theoretical state of the component, and applying active load on part of the connecting joints, establishing an updated finite element model according to the new boundary condition, constructing an optimization model to correct the active load, until the deviation of each connecting joint node force and element strain on the main force transmission path is within the set deviation value range in the actual state of the component, and then obtaining the simulation of statically indeterminate boundary of static test of the component.

The application provides a statically indeterminate multi-point support combined static test system for a multi-hanging missile, which comprises a bearing support module, a tooling module, a static loading module, a test module and a plurality of slider loading tools; the bearing support module comprises a bearing structure and a support structure; the hanging missile comprises a missile body and a plurality of sliders, the plurality of sliders are installed on the missile body and are distributed along the length direction of the missile body; the number of the sliders corresponds to the number of the slider loading tools one by one, and the tooling module is connected with the missile body; the static loading module can provide a force for the missile body through the tooling module; and the test module is used for testing the stress condition of the missile body. The test system scheme of the application is simple and convenient to operate, can safely and reliably perform static test verification on the statically indeterminate multi-point support of the multi-hanging missile, has low test cost, fully meets the requirements of the static test of the multi-hanging missile, and can more truly simulate the real stress state of the missile hanging under the air hanging condition of the missile.

The invention relates to a method for judging the anti-overturning stability of a single-column-pier curve beam bridge, and the method comprises the following steps: S1, calculating the anti-overturning stability effect of a bridge under the dead load action according to the basic principle of structural mechanics on the basis of the mechanical analysis of the displacement of a simply supported statically indeterminate curve beam and the reaction force of a support; s2, on the basis of mechanical analysis of simply supported statically indeterminate curve beam displacement and support reaction force, according to the basic principle of structural mechanics, the overturning instability effect of the bridge under the live load effect is calculated; s3, calculating the anti-overturning stability coefficient of the bridge according to the calculation results of the dead load anti-overturning stability effect and the live load overturning instability effect; and S4, based on the calculation result of the anti-overturning stability coefficient of the single-column-pier curve beam bridge, judging the anti-overturning stability of the bridge according to a standard threshold value. According to the method, the efficiency of calculating and judging the anti-overturning stability of the single-column-pier curve beam bridge can be improved, the popularization of a bridge health monitoring technology is facilitated, and the method has the advantages of simplicity, high efficiency and rapidness.