Papers by Keyword: Membrane Structure

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Authors: Wei Jian Zhou, Wen Bo Sun
Abstract: There is an absent of an effective way to measure the prestress of the structural membranes during the construction stage and under normal conditions. A new approach based on vibration method is proposed in this paper. This article analyzes the vibration characteristic of the typical membrane structures (Saddle Shape and High Point Shape) and provides the theoretical basis for a new approach which is convenient for operation and reliable for engineering application.
Authors: Hong Yuan Liu, Zhan Feng Fan
Abstract: Ultrafiltration processes are increasingly popular in drinking water treatment, as it can provide better quality water by removing microorganism and turbidity with lower filtration pore size, even without disinfection. Nonetheless, in our experiment the bacteria was occasionally detected in ultrafiltration effluent, and the related literature once had also been reported. This study was focused on the cause of secondary pollution in the drinking water ultrafiltration system, mainly from the production tank, biological stability, bacteria in air, as well as the membrane structure. And some solutions, including production water tank chlorination periodically, changing the operating mode of the ultrafiltration system, improving the design of the production tank, were studied to control secondary pollution in the treatment system.
Authors: Xu Feng Sun, Shi Rong Li
Abstract: Because of large flexibility and strong geometric nonlinearrity, the time domain method should be applied in the analysis of wind-induced vibration for the membrane structure, and the coupling effect between the structure and the fluid should also be considered. In this problem, it is hard now to solve it directly using the technique of three-dimensional transient FSI based on CFD. So in the article, a compromise schedule is proposed, i.e, for the mean wind part, the steady-state FSI technique is applied to solve the parameter such as the mean pressure coefficient, the mean wind velocity, etc, while for the fluctuating wind part, the time integral method is used based on the stochastic function of the wind velocity formed by auto regressive method. The aerodynamic damping is considered in the solving of fluctuating part and five computing schedule are compared, result shows that it is better to use positive mean wind damping for the nodes. It is also suggested that the stochastic wind velocity functuion can be revised based on the kinetic energy distribution of the reference points. A comparison between the computing and testing results show that it is greatly improved for the fluctuating response distribution of the structure.
Authors: Denis Veselov
Abstract: The article presents the properties study results of the dielectric membranes for sensitive elements of semiconductor gas sensors, obtained by different modes of the reactive magnetron sputtering of silicon with application of the two-stage unilateral anisotropic etching of silicon in the organic alkaline solutions. The qualitative analysis of the membranes stability to destructions and deformations in the course of their fabrication and heating is given. Optimum structures and modes of films formation for dielectric membrane structures are determined. The admissible thickness of the thermal silicon oxide underlay, which is does not promote to considerable membranes deformations in the course of their fabrication and heating, is identified.
Authors: Rostislav Lang, Ivan Němec, Ivan Ševčík
Abstract: The aim of this contribution is a form-finding process. It is the problem of initial pre-stressed shape generation of membrane constructions. The contribution deals with specific aspects of this process and the necessity of introducing stabilization with regard to its practical application. Individual examples will show the results of methods described in this paper.
Authors: D.S. Veselov, Yu.A. Voronov
Abstract: The new fabrication method of dielectric membrane structures for sensitive elements of gas sensors, based on the separation of anisotropic etching of silicon into two stages, is proposed. The preference etchant compositions, the preference elemental composition of membrane films and the acceptable thickness of the thermal silicon oxide underlay to obtain mechanically relaxed membranes are presented. The group technology for manufacturing of sensitive elements for gas sensors is developed, membrane structures are fabricated and their properties are studied.
Authors: Hui Feng Tan, Zhen Yong Du
Abstract: The conical inflated beams have steady bending stiffness before wrinkles appear according to experimental load-deflection curve, then the deflection distribute function is derived based on the differential function of deflection with variable bending stiffness. The equivalent bending stiffness is presented while the conical inflated beam equates to cylindrical inflated beam, according to the deflection formula of beam, the model of equivalent bending stiffness of conical inflated beams is obtained. Comparing the equivalent bending stiffness of conical inflated beams between theoretical model and Experiment results, it is found that they agree with each other well.
Authors: Jian Rong Sheng, Tian Jiao Zhang
Abstract: This paper analyses the membrane structure’s building material, structural style and its deformability, through which we pointed out that the membrane structure features light-duty and sustainable characteristic. Besides, this article describes the advantage of membrane structure in the area of environment protection and energy-saving from three points of view: acoustic, optical and thermal properties. In addition, development trends of membrane structure in the future constructions as well as the applications in China’s construction development are discussed, leading to the conclusion that the membrane structure, as a kind of light-duty architecture, has great prospects for environment protection and energy-saving applications.
Authors: Hong Zeng, Yu Pu, Jun Long
Abstract: This paper reviews the research on the deflection of the orthotropic flat membrane and saddle membrane under the external snow load. First the authors analyze the characteristics of snow load and obtain the standard snow load. Second we build the models of the orthotropic flat membrane and saddle membrane under the snow load. Then we deduce and solve the equations set of the two membranes under the effect of the pretension with the perturbation method. So we obtain the relational expression between the maximum deflection of the membrane’s centre point and the external load. At last, suppose that the load was determinate, the authors analyze the change of the deflection of the centre point of the membrane with different pretensions, side lengths and other parameters.
Authors: Wei Guo Yang, Xing Po Li
Abstract: In order to obtain a real shape of membrane structure, a new shape finding method was developed based on real material property. The curved shape is first obtained by raising the control points above the projection plane. The convergence was improved using pseudo material properties to get a preliminary shape, and then the real properties to get the final shape. A large number of examples were analyzed to verify the validity and practicality of this method. The results showed that the final curved surface after the second shape finding process was always quite similar to the first one. Moreover the curved surface obtained after the second shape finding process is accurate and will be realized in real.
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