3 results about "Modal strain energy" patented technology

The application discloses a pile foundation positioning and quantitative damage identification method and device and a storage medium, and belongs to the technical field of engineering detection. The method comprises the following steps: dividing a pile body into a plurality of pile body sections, and acquiring acceleration time history data of nodes at both ends of each pile body section; performing modal analysis on the acceleration time history data, and estimating modal shapes of each node; calculating modal strain energy residual variables of each pile body section by using the modal shapes; drawing a curve of the modal strain energy residual variables of each pile body section according to the division order, and positioning a pile body section corresponding to a protruding position of the curve as a damage section; establishing a numerical relationship between the modal strain energy residual variables and the pile body integrity, and converting the modal strain energy residual variables of the damage section into the pile body integrity based on the numerical relationship to quantitatively judge the damage degree. The application has the advantages of small amount of measured data and calculated amount, high identification precision, and convenient application in actual engineering.

The application provides a large-span steel structure closed loop analysis method and system, the analysis method comprises the following steps: constructing a finite element model and a design parameter space, identifying key design parameters and key regions affecting the first N modal strain energy of the structure through initial sensitivity and modal analysis, and establishing a mapping relationship between the two; according to the parameter sensitivity contribution, a non-uniform sampling strategy is formulated, the sampling is encrypted in the high sensitivity parameter subspace, an initial sample set is generated, based on the sample and the finite element response, a hierarchical mixed kernel Kriging surrogate model containing a global long-range kernel and a multi-region local short-range kernel is constructed, the local kernel weight increases as the input point approaches the high sensitivity region, the iteration termination and the performance limit state are set, the composite point adding criterion integrating the prediction variance, the limit state distance and the cross-validation error is used to iteratively update the sample and the model, and after the condition is met, the structure performance analysis is completed by using the surrogate model.

The application provides a machine tool column structure optimization method based on finite element simulation, and relates to the technical field of machine tool column structure optimization.The application accurately defines the key laying area of the constraint layer damping which is most effective in inhibiting resonance according to the threshold screening and region growing algorithm in the inner wall of the column based on the identified risk resonance mode, the modal strain energy cloud diagram and the mode shape animation, and establishes a parameterized model to realize the coupling optimization of the thickness, so that the precise positioning and on-demand distribution of the damping laying are realized.The utilization efficiency and damping effectiveness of the damping material are fundamentally improved by concentrating the limited damping material in the local area with the most dense vibration deformation energy and strain energy, material waste and invalid weight increase are avoided, and in combination with the parameterized optimization, the design space for reducing the damping layer coverage area, reducing the cost and process complexity is provided under the premise of ensuring the dynamic performance.