E-ACE (acrylic elastomer) is a kind of material so far in electro-active polymer (EAP) in the most excellent performance. Based on the analysis of the basic principle of the E-ACE power generation, the feasibility is studied on E-ACE power generation principle to achieve energy recovery and damping. Design a model damping device of vehicle for energy recovery based on E-ACE. Through analysis, when the system vibrates near the resonance frequency, deformation of spring is greater, E-ACE materials to move up and down reach the larger amplitude, and the more energy it produces. To analysis the system about harmonic response by ANSYS software, get the relationship between spring stiffness K, damping coefficient C and external incentive, then analysis the resonance frequency of the system. The simulation results verify the feasibility of the design scheme. Results show that E-ACE has excellent performance in the automobile vibration energy recovery and vibration. E-ACE will have broad application prospects.

In the engineering background of the prototype test of a deep radial gate on three gorges dam, two methods are provided for the modal parameter identification of the radial gate, one is applying operation modal analysis (OMA) to a gate which is under flood discharge, the other one is applying experiment modal analysis (EMA) to a inactive gate with some other gates under flood discharge. This paper is based on the feasibility study on the former method. We use the natural excitation technology (NExT) combined with the eigensystem realization algorithm (ERA) to determine the dynamic characteristics of a gate. Displacement data at 7 locations were processed using NExT-ERA to extract the natural frequency and associated damping ratio. The results show the effectiveness of this modal identification methodology and the possibility of implementing it on other hydraulic structure.

Viscous dampers are widely used in vibration energy dissipation project. The researches on viscous dampers used in energy dissipation project at present are more, and one of the main research contents is about how to improve energy dissipation efficiency. In the current study, the effect of the supporting stiffness in dampers is neglected, and only its strength and stiffness is verified. Based on the research on the principle and mechanical model of viscous damper, the influence of supporting stiffness on various energy dissipation working parameters has been analyzed in this paper. The results showed that, supporting stiffness has great influence on the energy dissipation efficiency, then with energy dissipation efficiency as the index, this paper derived the generality support stiffness design formula for energy consumption optimizing, which provide scientific basis for similar design.

Shell stiffeners are used effectively to prevent preferential local buckling of LNG tank shell. In this paper, Finite element method (FEM) is applied to pay attention to the thermal analysis on the shell stiffeners of double steel wall LNG storage tank. The structural requirements according to British Standard 7777-2:1993 has been considered and then some dimensional adjustments of shell stiffeners are made to evaluate their influence on the thermal field of double steel wall LNG storage tank. Temperature distributions and heat flux of different dimensional shell stiffeners are presented. Though the analysis of results, it puts forward the conclusion that the dimensional design of shell stiffeners used in double steel wall LNG storage tank shall take not only the structural design requirements but also the thermal design ones into consideration in order to finally save cost in both construction and normal operation.

In order to provide scientific basis for design and application of cast steel joint, this paper researches on mechanical properties of tubular-plate combined cast steel joint and tubular cast steel joint, which work in International Expo Center in the most unfavorable load condition. Finite Element Method (FEM) is employed to analysis the mechanical properties of the complex cast steel joint and an optimize solution is given. FEM based on large deformation theory and material nonlinearity obtained ultimate load and failure mode of the joints. The results show that, force transmission path of combined cast steel joint is complex for its cross-section shape of branch changes much; stress concentration is very obvious on the branch. In contrast, the force transmission path of tubular cast steel joint is clear and concise; the phenomenon of stress concentration alleviated effectively, the efficiency of material improved greatly; in the same amount of material, the ultimate bearing capacity of tubular cast steel joint increased by 9.5%. The joint design should follow the principle of simple and practical in premise of mechanical requirements.