3 results about "Load deflection" patented technology

The application provides a sandwich combination structure lower hanging steel beam coordinate precision control method, and belongs to the technical field of wind tunnel construction. The application establishes an independent reference control network, sets a forced closed control point to block error linear transmission, calculates the lower hanging steel beam camber, and offsets the dead load deflection through reverse prefabricated bending processing. A buried part rigid positioning frame is installed and the position deviation is monitored. A hydraulic synchronous jacking device is used to iteratively adjust the posture of the steel beam. Pre-stressed tension is applied to realize reverse arch shaping. Finally, the least squares adjustment technology and the minimum spanning tree optimization algorithm are used to reasonably distribute the section cumulative error between the forced closed control points, thereby solving the technical problem of excessive steel beam coordinate precision caused by large-span multi-section construction cumulative error.

This invention relates to the technical field of testing devices, specifically disclosing a wind turbine blade static load deflection and tilt testing device and its usage method. The device includes a moving component, a receiving component, a clamping component, and a detection component. The clamping component is located below the receiving component, which is also below the moving component. The detection component is fixedly connected to the lower end of the moving component and located above the receiving component. The wind turbine blade is located inside the clamping component. The detection component includes a support platform, a rotating cylinder, a connecting rod, a drive rod, and a laser collimator. A cylinder support frame is rotatably mounted at the middle position of the rotating cylinder, and the right side of the cylinder support frame is fixedly connected to the left side of the support platform. A rotating connector is rotatably mounted at one end of the rotating cylinder, and the rotating connector is fixedly sleeved at the middle position of the connecting rod. This invention can automatically calibrate and test the detection component, automatically adjusting it to a suitable angle and position, and can clamp wind turbine blades of various types and sizes.

Using a bending test with enhanced measurement accuracy, this experimental study involved testing partially sheathed composite steel beams with and without prestressing and without openings on the vertical plate. The bending strength and behavior patterns were also analyzed. The new technique for these composite beams proved to be an effective bending system. The steel-constructed structure significantly increased the bending capacity of the sheathed beam, while the prestressing of the cables was dependent on the steel's stress ratio. An infinite-scale analysis was conducted to study the behavior up to failure of a partially supported and partially covered composite beam subjected to a constant symmetrical load. Three-dimensional models were then analyzed using finite-element software to assess the beam's behavior under load deflection and failure conditions. The methodology employed was nonlinear gear and nonlinear geometric analysis based on repeated load incrementing. Twelve models were analyzed using this method to verify their potential and effectiveness. The results obtained using finite element models and failure methods were compared with experimental results. Good correlations were found between finite element analysis and experimental results.