Applied Mechanics and Materials Vol. 482

Abstract: This paper seeks to outline the concept and application of health monitoring system in aircraft structure. The focus is placed on the principles and methods of the structural health monitoring system, including SMART layers, electric potential method, Acoustic Emission, etc. The difference between the above monitoring methods is justified and clarified. Finally a perspective view on structural health monitor techniques is discussed.

Abstract: A thick-walled cylinder under outer pressure load was studied by means of the Finite cell method (FCM). Sensitivity analysis was made to demonstrate the advantage of this method. Shape optimization of a turbine disk is conducted. It is shown that the introduction of B-spline basis function can achieve a high continuity of stress filed along the cell boundary.

Abstract: This article constructed the stress distributions function expression of four free edges square basal bottom slab touching foundation respectively from the two aspects of symmetric and anti-symmetric load, placed the foundation on the surface of the sandy soil, do numerical simulation to the contact stress between foundation slab and foundation through the large scale finite element analysis software ANSYS, and fitting by adopting the contact stress function proposed in this article. The contact stress function and finite element numerical fitting result shows that the contact stress function proposed in this article can better reflect the actual contact stress distribution, also adapt to foundation slab with different width height ratio.

Abstract: Quayside container crane, referred to as the bridge crane. The steel structure is usually the permissible stress method is adopted to design check, analysis on its dynamic characteristics through the finite element analysis, can the actual working state simulation of crane more accurate. The dynamic characteristic analysis of problem, change to correct the parameters in the design, greatly improved the design efficiency and accuracy .

Abstract: Combing the advantages of frequency response method with the advantages of short-circuit impedance method, put forward the sweep frequency short-circuit impedance method. Analyse the windings deformation basing on the mutual difference of short-circuit impedance at different frequencies. The validity of this method is preliminary verified at last.

Abstract: The reason of most accidents in the construction engineering are due to the complicated nature of concrete composition, shortcomings during the construction process, equipment and many other reasons. Reinforced concrete quality account for a large percentage of engineering accidents. In this paper, reinforced concrete structures accident type and its causes were classified and summarized through the summarizing and sorting of different cases, and the relationship between them was analyzed and expounded.

Abstract: Damping ratio is a very important parameter for building structures in the analysis of dynamic response. Story-adding RC structure of light-weight steel is composed by two different material stories. If all the modal damping ratios are defined as the same, as to the dynamic analysis for that structure, the results of analysis will be inappropriate. This paper made some response spectrum analysis on a six-story story-adding RC structure of light-weight steel by finite element analysis software Midas Gen through defining the Rayleigh damping. In the meanwhile, compared the results based on different Rayleigh damping parameters with the results by using the method of strain energy proportional, and got the rule of the definition of Rayleigh damping.

Abstract: The theory of vibration resistance of blocking mass at the corner interface of L-shaped plates is put forward from the perspective of wave approach. The equation of transmission and reflection coefficients of flexure wave is deduced by the presented theory. Based on FE/SEA method, the vibration resistance performance of the hollow blocking mass at the corner interface of L-shaped plates was studied through numerical simulation. The results show that the hollow blocking mass can impede the propagation of the high frequency vibration waves, reduce the vibration and sound radiation of the latter plate, and increase the influence of the reflection waves on the former plate. However, the overall radiant energy is basically identical to the L-shaped plates without the hollow blocking mass.

Abstract: Experiments were performed on Jundu Mountain Aqueduct Bridge, the article introduces the identification methods and processes which obtain modal parameter of bridge subject to Environment excitation. Layout of points effectively by moving the measurement method can obtain reliable measurement data, and it uses self-power spectrum、cross power spectrum and coherence function analysis , With the use of analytic technology for spectrum, has identified the preceding six natural frequency of the bridge vibration and has analyzed the phase information of he bridge vibration.

Abstract: The coal transport trestle as a connection channel is widely used in large and medium-sized coal enterprises, which plays an important role in the whole manufacturing process. The vibration problems in coal transport trestle can not only reduce the occupant comfort, cause people serious harm, but also have pernicious effect on structure. Along with the structure aging and dynamics property change, things go badly, which even causes enormous life and property loss. This paper describes the vibration testing and analysis methods of the steel truss coal trestle though engineering examples. The results show that the belt transport system is the main reason which caused the vibration of the STCT, and trestle must undergo resonance phase with the exciting force changes.