37 results about "Shape finding" patented technology

Embodiments of the invention provide a bridge structure design shape finding method and device, and the method comprises the steps: S1, building an initial structure model of a bridge, and carrying out the static structure analysis of the initial structure model; S2, based on a static structure analysis result, performing topological optimization on the initial structure model by taking the volumereduction amount as a constraint condition and taking the maximum rigidity as an objective function to obtain an optimized structure model; and S3, if it is known through judgment that the optimizedstructure model meets the optimization design target, taking the optimized structure model as the structure model of the bridge. According to the embodiment of the invention, topological optimizationis carried out on an initial structure model by taking the volume reduction amount as a constraint condition and taking the maximum rigidity as an objective function. Compared with an initial structure model obtained by a traditional bridge design method, the obtained optimized structure model has higher stress and lower mass, so that the material cost can be reduced, and greater economic benefitscan be obtained.

The invention relates to a contact line static space position-based contact network suspension three-dimensional rapid shape finding method. The method comprises the following steps: firstly, calculating vertical forces of a contact line dropper point and a positioning point according to a contact line static space position; calculating the three-dimensional static shapes of the carrier cable andthe elastic sling according to the static space position of the contact line, the vertical force of the dropper point and the displacement constraint of the dropper point of the contact line; calculating the gradient and the spatial position of the positioner according to the static spatial position of the contact line, the vertical force of the positioning point and the length of the positioner;and finally, calculating the three-dimensional static shape of the contact network suspension according to the three-dimensional static shapes of the carrier cable and the elastic sling at the staticspace position of the contact line and the slope of the positioner. According to the method, the actual stress state and elastic deformation of the overhead line system suspension cable are considered, the method is simple and efficient, simple chain shapes of various line conditions and actual contact line static space positions and three-dimensional static shapes of elastic chain shape suspension can be accurately calculated, and the method is directly applied to pantograph-catenary system design, overhead line system construction pre-configuration and overhead line system state maintenance.

The invention relates to a reticulated shell shape optimization method based on iterative shape finding, which comprises the following steps: 1) setting a reticulated shell initial structure, obtaining an initial node coordinate and an initial axial force, and setting an initial external load of the structure; 2) calculating a stiffness matrix of the current iteration stage according to the node coordinates and the axial force of the current iteration stage; 3) setting a boundary condition by adopting a zeroing setting method, and solving a node coordinate of a next iteration stage through anoverall balance equation according to the rigidity matrix, the node coordinate and the external load of the current iteration stage; 4) according to the node coordinates of the next iteration stage and the rigidity matrix of the previous iteration stage, calculating through a unit balance equation to obtain the axial force of the next iteration stage; and 5) setting a convergence condition, if theconvergence condition is satisfied, completing reticulated shell shape optimization, and otherwise, returning to the step 2) until the convergence condition is satisfied. Compared with the prior art,the reticulated shell shape optimization method has the advantages of simple steps, rapid convergence, convenient adjustment, suitability for single-layer and double-layer reticulated shells and thelike.

A method for shape-finding optimization design of a strong-coupling tree structure includes such steps of setting initial parameters, establishing a tree structure with two-element numerical model; ifm is an odd number, applying the reverse load; solving the internal force of each branch and calculating the temperature load of all branches; if m is an even number, applying a temperature load; extracting vertical displacement of all nodes; changing the node position according to the vertical displacement of the extraction point until the maximum node displacement is less than the threshold value, and finishing the shape-finding process. The method of the invention adopts the two-element numerical model, wherein the cross-sectional area of the rod element is far larger than that of the beamelement, and the beam element is provided with a very small bending rigidity, so as to overcome the problem that the tree-like model of the two-element cannot be solved because the rigidity matrix isnot satisfied with the rank. The method of the invention has very high precision and high efficiency, avoids heavy programming work, couples optimization and shape-finding in one iterative program, converges quickly, and ensures maximum stable bearing capacity of tree structure as a whole.

The invention discloses a design method of a large-curvature cable-membrane structure, and aims to solve the technical problems that the existing cable-membrane structure is easy to generate larger deformation to change the shape size or loosen, and the analysis and design theory of the cable-membrane structure at home and abroad is not completely mature. The design method comprises the following steps: (1) carrying out performance analysis on a membrane material to be used by the large-curvature cable membrane structure; (2) adopting ANSYS software to carry out shape finding analysis on the large-curvature cable membrane structure; (3) selecting a membrane material with a proper thickness; (4) optimizing a reinforcing cable net in the large-curvature cable membrane structure; (5) carrying out technical verification and hardware optimization on the large-curvature cable membrane structure; and (6) designing proper light transmittance of the membrane material. According to the design method, a collaborative stress system of the steel cable, the membrane material, the hardware and the cable membrane support steel structure is optimized, the overall stress stability of the structure and the applicability of the component are improved on the premise that the material performance is brought into full play, and the building body art is perfectly expressed.

The invention discloses an overhead conductor shape finding method based on ABAQUS finite element software, and the method comprises the following steps: S1, calculating the length and elongation of aconductor under the action of gravity, and solving the length of the conductor under an unstressed condition, namely, the original length of the conductor; S2, calculating the linear distance of a wire hanging point, and comparing the linear distance of the wire hanging point with the original length of the wire calculated in the step S1 so as to judge the initial shape of the wire; S3, modelingis carried out according to the initial shape of the wire, initial assembly stress is preset, finite element analysis is carried out after the attenuation coefficient in the analysis step is set, a resolving result is obtained, and simulated sag and simulated maximum stress are obtained; And S4, calculating a relative error value of a resolving result, judging the correctness of modeling, finishing resolving if the error value conforms to a preset threshold condition, and returning to S3 to correct the attenuation coefficient in the analysis step and continuously executing until the error value conforms to the preset threshold condition if the error value does not conform to the preset threshold condition. The method is simple to operate, stable in calculation result and high in accuracy.

The invention relates to a finite element shape finding analysis method for a cable structure, and the method comprises the following steps: building a broken-line-shaped finite element model of a cable structure, applying a concentrated load to a broken point of the finite element model, and solving an initial balance state solution of the cable structure under prestress and the concentrated load; under the initial balance state solution, continuously superposing the dead weight and/or the external load, and solving a working state solution obtained after superposing the dead weight and/or the external load on the cable structure; and eliminating the concentrated load, solving a final state solution, and determining the cable structure form. According to the method, broken line modeling is adopted, the modeling of the cable structure can be more convenient, and the initial balance state solution under the action of the concentrated load is obtained based on the finite element model ofthe broken line, so that the initial balance state solution of the cable structure can be more efficiently, simply and conveniently solved, the initial balance solution obtained through solving is transited to the working state solution, and the structural deformation under the dead weight and/or the external load can be more conveniently calculated.

The invention discloses an initial shape-finding analysis method and system for icing stress of a power transmission line. The method comprises: equally dividing a wire into a plurality of wire unit sections in the horizontal direction in the whole span; determining an initial displacement vector of each conductor unit node through a catenary equation; and according to the elastic modulus, calculating and obtaining the initial original length and the elastic rigidity of each conductor unit section. The initial original length and the elastic rigidity of each conductor unit section can be quickly determined, initial calculation data are provided for iterative calculation when a finite element method is combined with a kinetic equation to analyze the icing stress of the power transmission line, and the pertinence and the calculation precision of icing stress analysis of the power transmission line are improved.

The invention discloses a power transmission wire shape finding method, system and device. The method comprises the following steps of: obtaining power transmission line information of a wire and determining a wire type; based on the line information and the wire type, establishing a form-finding transcendental equation set and a constraint equation set according to a force balance condition at aspacer; solving the transcendental equation set and the constraint equation set to obtain a spacer height difference, segmenting the conductor based on the spacer height difference, and calculating conductor sag and stress distribution in the conductor segment by adopting a catenary method; and determining the shape of the wire according to the spacer height difference, the wire sag and the stressdistribution. According to the method, the problem of inaccurate shape finding result caused by the fact that the prestress-free initial state information is difficult to obtain in an existing finiteelement method is solved. The method can be used for power transmission wire shape finding under complex conditions such as strain insulator strings, spacers and concentrated loads, and is wide in application range.