An analytical method of single field reducing-coupling on dynamic modeling is presented
to analyze dynamic behaviors of thin plate structure based on dynamic fundamental solutions. In order
to improve systematic modeling precision and efficiency, the method of single field
reducing-coupling is introduced to deduce governing equations of thin plate structure dynamics by
dynamic boundary element method (DBEM). The scale of matrix and generated time of coefficient
matrixes are shortened greatly and dynamic behaviors of thin plate structure is obtained rapidly and
accurately. The numerical examples and experiments show that the theory, established method and
calculating program are feasible, and it has good precision and high efficiency.
TC4 blades are one of the major parts of the aero engine, and the examples of engine invalid and even wrecked are common. In this paper, a 3D analysis system of the vibration behaviors of the TC4 blades is given. The 3D analysis model of blade was described using 20 nodes elements. The finite element procedure was worked out using the blade vibration behaviors analysis of the aero engine. At last, the modal shapes and stress nephograms of the first six frequencies are gotten which influenced the blade vibration characteristics. Results show that the program has offered an effective, flexible research means for analyzing dynamic response of TC4 blades.
Laser shock processing (LSP) is an innovative surface treatment technique. According to the theory of residual stress field formation by laser shock wave, laser overlapping shock processing of LY12CZ aluminium alloy was analyzed. The diagonal shock process is simulated by FEM using LS-DYNA codes, and the residual stress field in different angle of fall and pressure are predicted. The results indicate that the value of residual tension stress can be increased when diagonal shock, and the value of residual compressive stress will be decreased. The simulated results can provide the basis for experimental studying the diagonal laser shock processing and laser facular overlap.
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