Damage features extraction of prestressed near-surface mounted CFRP beams based on tunable Q-factor wavelet transform and improved variational modal decomposition

In order to solve the problems of excessive weight and unreasonable structure of anchor machine parts caused by traditional design methods, a lightweight optimization method was proposed based on pre-stressed modal analysis. The design variables were determined, and the parameterized model was established by using ANSYS Workbench. Under ultimate load conditions, the strength of wall frame board and lower box bodies was simulated and calculated. Through modal analysis, the discretized natural frequencies under different design variables could be obtained. The multi-objective genetic algorithm and sequence quadratic programming were respectively used to calculate the lightweight analysis model. The results showed that the weight of the supporting components in ship anchor can be reduced by more than 5 % without reducing strength and equivalent stiffness.

Section: Parameterized Wall Frame Board Modelmentioning

confidence: 99%

Analysis and optimization of pre-stressed modal features of ship anchor support parts

Liu,

Wu,

Calderon

2024

“…The modal testing system includes a force hammer, acceleration sensor, electrical load amplifier, and LMS data acquisition system. Among them, the impact of the hammer on the test pipeline generates an excitation signal, and the acceleration sensor measures the pipeline response signal [9]. The signal is amplified by a charge amplifier and collected by the LMS data acquisition system.…”

Section: Fig 2 Experimental Design Of Modal Testingmentioning

confidence: 99%

Analysis of vibration response characteristics of composite pipeline based on finite element method

2024

In order to ensure the good stability of the composite pipeline under fluid dynamic loads, finite element analysis method was applied to simulate and calculate the modal characteristics under dry and wet mode conditions. According to the working principle and structural characteristics of composite pipelines, the model was parameterized and simplified to improve computational efficiency and convergence. The modal testing platform is constructed, consisting of a combination of pipeline structure and pipeline support structure. The movement direction of the slider is limited by the guide rail used, allowing the horizontal section of the branch to move only along its own pipeline axis direction. The fluid structure coupling analysis technology was applied to obtain the vibration mode and spectral response results of the composite pipeline, which was verified through an experimental platform. The research results indicate that the natural frequency in wet mode was about 16 % lower than that in dry mode. In addition, it could be proven that the simulation scheme had good computational accuracy, with a maximum error of 9.2 %.

“…The components of the hydraulic cylinder are mainly connected to each other through screws, and the preload will change the contact stiffness between the connecting components, affecting the natural frequency [6,7]. Therefore, the preload should be applied according to the actual working conditions.…”

Section: Simulation and Analysis Of Staticsmentioning

confidence: 99%

Analysis of preload modal characteristics of hydraulic cylinders based on finite element method

Wang

2023

In order to study the dynamic response of hydraulic cylinders under complex load conditions, the modal characteristics of hydraulic cylinders were simulated and calculated by comprehensively considering the combined effects of preload and oil fluid dynamics. The contact in the finite element model was specially processed to ensure that the local degrees of freedom of the piston in the structure were maintained during the modal simulation calculation process. After the static characteristics were calculated, the relevant data was imported into the modal simulation module to achieve coupling analysis under preload. By verifying the contact stiffness factor, the boundary conditions of the model were effectively optimized. The natural frequencies of the model were compared and analyzed under different piston strokes, and the mechanism of dynamic response was obtained. Through modal testing, the results indicated that the simulation results had high accuracy and reliability.