9 results about "Shape finding" patented technology

The invention discloses an ice-coated conductor galloping load equivalent loading method and system based on finite element analysis. A conductor model is established based on actual line parameters, a conductor is established based on engineering simulation software, and initial tension is applied; three-component pneumatic parameters are obtained through a full-wind attack angle wind tunnel test, a pneumatic load mathematical model is constructed, and the load on a wire is calculated; and according to the calculated load size, loading a concentrated load on a node in the conductor. According to the method, dynamic aerodynamic force is equivalent to node concentrated force loading through a quasi-static load conversion strategy, and efficient and accurate galloping simulation is realized in combination with conductor nonlinear shape finding and wind tunnel test data. The problems of low dynamic fluid-solid coupling iteration efficiency and high model complexity are solved, and an efficient and reliable technical means is provided for power transmission line anti-galloping design and disaster prevention evaluation.

The application relates to a cantilever structure installed on a public building and a hoisting method thereof, and belongs to the technical field of public building reconstruction construction. The structure comprises edge truss units, installation cables and shape-finding cables. The edge truss units are provided in plurality, the edge truss units are connected in a head-to-tail mode to form a closed loop, the edge truss units are connected with the installation cables respectively, the edge truss units are connected with the shape-finding cables respectively, the edge truss units are provided with fixing members respectively, the fixing members are used for realizing fixed connection between the edge truss units and the public building, the installation cables are used for enabling the closed loop formed by the edge truss units to have certain rigidity, and the shape-finding cables are used for shape finding of the closed loop formed by the edge truss units. The application has the effect of increasing a large-scale auxiliary structure on the original public building.

The application discloses a parameterized power transmission line tension field site arrangement simulation method and equipment, combines an interpolation method and a shape finding analysis method to perform structural characterization on extracted nodes, and performs parameterized modeling according to the characterized structure, and further obtains a tension field site model, the tension field site model accurately feeds back the shape of the tension field, and meanwhile, accurately feeds back the interaction relationship between each machine and each structure, provides an accurate, stable and consistent tension field site model with a construction site for subsequent tension field site simulation; arrangement simulation parameters after construction verification are input into a tension field site migration model again for cyclic processing until optimal arrangement simulation parameters are generated, the optimal arrangement simulation parameters are used as optimal tension field site construction parameters and are subjected to construction, and the problems that local engineering calculation is performed on the parameters by means of manual work, the calculation result is not standardized, and meanwhile, the positions of dangerous points in the tension field site arrangement cannot be accurately estimated are solved.

This invention discloses a decommissioned wind turbine blade dismantling device with self-optimizing shape-finding function, belonging to the field of wind turbine blade dismantling technology. It includes a support frame with support positions for supporting and fixing the airfoil body and a clamping mechanism for clamping the flexible trailing edge. A guide rail is provided on the support frame, and the movement path of the guide rail coincides with the connection between the airfoil body and the flexible trailing edge. A cutting blade capable of moving along the guide rail is installed on the guide rail. The clamping mechanism includes multiple clamping cylinders arranged along the extension direction of the flexible trailing edge, and a drive cylinder fixedly installed on the support frame for pushing the clamping cylinders to move linearly. The support frame has multiple sliding grooves corresponding to the clamping cylinders. A fixing block extending into the sliding groove is fixedly connected to each clamping cylinder, and a spring is fixedly connected between the fixing block and the inner wall of the sliding groove. This invention stretches the flexible trailing edge in the clamping state using the clamping cylinders, putting the flexible trailing edge in a taut state to facilitate cutting.

The invention discloses a spatial self-anchored suspension bridge main cable shape finding calculation method, and belongs to the field of bridge structure design, and the method comprises the following steps: S1, initializing an iteration initial value; s2, respectively carrying out iterative calculation on node relations of the slings and single main cable sections between the slings, and completing iterative calculation of each cable section of the main cable; s3, carrying out deformation compatibility condition judgment on the main cable; s4, if the error precision is not met, calculating the correction amount of the iteration initial value, updating the initial force iteration value, and executing S2; s5, if the error precision is met, other main cable crossing calculation is carried out, and S1 to S4 are repeated; s6, performing finite element calculation; s7, checking whether the error between the coordinate value of the control point of the main beam model and the design value meets the precision requirement or not; if not, correcting the initial strain of the main beam and returning to S6; and if yes, executing S8: taking the counter force at the vertical constraint position of the model obtained in the step S7 as the vertical force borne by the corresponding sling at the anchoring point of the stiffening beam until the main cable line shape at the moment is determined to be the final line shape in the bridge forming state.

The application discloses a kind of main cable form finding method and device considering oblique central buckle, it is related to suspension bridge design field, the method includes the component in bridge main cable sling system decomposition;The vertical coordinate and horizontal coordinate of the right end point of the first cable segment of main cable are calculated to obtain, the unstressed length of the first cable segment of main cable, the three-way component force of the right end point of the first cable segment of main cable;The three-way force of sling upper end point and the unstressed length of the cable segment where sling is located are calculated;The three-way force of oblique central buckle upper end point, the three-way force of oblique central buckle lower end point, the unstressed length of the cable segment where oblique central buckle is located are calculated;The three-way component force of main cable left end point, the coordinate of main cable right end point, the three-way force of oblique central buckle lower end point, the three-way force of sling lower end point, the three-way force of sling upper end point and the three-way component force of main cable left end point are sequentially solved;The unstressed length of each cable segment of main cable, each sling and oblique central buckle is obtained.The main cable form finding in the application considers the influence of central buckle, effectively guarantee form finding effect.

The application provides a cableway bridge parameterized modeling method based on geometric form finding and space topology mapping, relates to the technical field of bridge engineering digital design and modeling, and the technology comprises the following steps: constructing a calculation domain, analyzing form finding, constructing an assembly reference, component topology mapping and full model generation. The application establishes a full parameterized driving dynamic model: all geometric features of the model are driven by input design parameters and topology relations. Through preset parameter dependence relations and update sequences, the system can automatically and orderly update the whole three-dimensional model when the parameters are changed, realizes "one modification, everywhere update", significantly improves the design iteration and scheme comparison and selection efficiency, and solves the core problem of parameter and model disconnection.

The invention discloses a whole-process accurate shape finding mathematical model for a high-speed railway No.18 line fork contact network, and solves the high-point problems of height difference of two end points, non-uniform on-way tension, influence of sag change and the like caused by dynamic height change of the contact network. Modeling is improved on the basis of a hybrid cable unit theory, specifically, a geometric shape is constructed according to contact line position partition by combining a parabola and a catenary linear cable unit, and the method adapts to uneven tension; deriving a cable unit unbalance force algorithm, solving tension distribution by using a Newton-Raphson iteration method, and quantifying a coupling relation between height difference and sag; a dynamic correction shape finding model is established, and dynamic transition form distortion is solved; and constructing a pantograph-catenary coupling dynamic model. The actual measurement verification of the No.18 line turnout shows that the deviation of the improved model is less than 5%, the model accords with the EN50318 standard, and the quantitative analysis shows that the equal-height point is the main cause of the turnout parameters of the non-cross contact network on the bow-catenary coupling performance. According to the technology, the accuracy of pantograph-catenary coupling performance analysis can be improved, and a quantitative design basis is provided for optimization of a catenary system.

The present application relates to structural engineering shape finding analysis technical field, disclose a kind of complex free curved surface structure full-automatic iterative predeformation shape finding method, this method with the target node coordinates of complex free curved surface structure as convergence target, establish finite element analysis model, determine control node set, and receive node control proportion and difference control value;According to target load combination Automatic execution forward loading analysis, automatically read node displacement and deformation after shape, generate shape finding shape based on node displacement and write into finite element analysis model;Subsequently, repeatedly execute forward loading analysis, node difference value calculation, adjacent two times node displacement difference value calculation and current shape finding shape update, until meet node control proportion after automatically output design initial shape.The present application can reduce the error accumulation caused by artificial export coordinate, modify model and judge convergence, improve the efficiency, accuracy and reviewability of complex free curved surface structure predeformation shape finding.