Papers by Keyword: Flexible Support

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Authors: Gang Ma, Yun Long Du
Abstract: Aimed at cantilever-type foil cylinder film seal system, finite element method analysis model was established to calculate the deformation of cantilever foil under the gas pressure based on the theory of plate bending. The paper proposed a method to solve fluid-solid interaction problems in cantilever-type foil cylinder film seal system based on the numerical analysis method of cylinder gas film seal. The calculation program using the finite element method to solve fluid-solid interaction problems was developed. Calculation simulation of the film mechanical properties and steady-state performance of sealing system was realized which improved the accuracy of the sealing system performance analysis and provided the basis for the multi-parameters matching design of sealing system. The impact of adding cantilever foil support structure to the steady-state performance of sealing system and the influence of flexible support parameters on the steady-state performance of the sealing system was calculated through the method.
Authors: Wen Yi Chai, Yong Jie Xie, Wei Wang, Meng Yuan Wu, Xue Wu Fan
Abstract: This paper describe design and optimize of the lightweight primary mirror assemblies for the space telescope, aim at supporting structure of the primary mirror with an aperture of 530mm for the Cassegrain optical. We design three kinds of flexible support structure for the mirror, and numerical simulation analysis the accuracy of reflective shape for mirror assemblies on the ground test and in-orbit work environment, compare the results of analysis and optimize parameters of flexible structure, determine the final project and put it into production. The results show that the component should be aligned and tested in the same direction of the mirror optical axis and the gravity, the accuracy of reflective shape is PV<λ/25 and RMS<λ /125 (λ = 632.8nm), under the state ofΔ4oC temperature change, the RMS<λ/234 (λ = 632.8nm), the project meet design requirements of the optical system.
Authors: Kyung Su Kim, Sung Chan Kim, Dae Ho Kim, Chang Hwan Lee, Jung Hee Kim, Seung Bok Choi
Abstract: The effective breadth of a stiffened plate under bending was investigated. The design parameter of an effective breadth was used when a stiffened plate subjected to a lateral loading was considered. Due to the lateral loads there was shear transmission through the plate from the stiffener, which leads to a non-uniform longitudinal stress distribution across the plate width the effective breadth that takes into account a shear lag can be calculated by the simple beam theory. For a tanker, the existing effective breadth concept has been used when longitudinal stiffeners are fixed at adjacent web frames. However, the effective breadth of each classification’s formula can’t be applied to flexible support condition such as the one prevailing in Ro-Ro vessel. The effective breadth according to the rules of several classification societies was compared and a way to get an accurate analysis as suggested.
Authors: Wei Gang Zhan, Jia Wang, Nian Li Lu
Abstract: This paper presents an analysis in attachment spacing of tower cranes. Both the support spacing under the rigid support and the flexible support are obtained for this purpose. For deriving the rigid support spacing, differential equation is used. The principle is used for calculating the support spacing, which the extended segment has the same Euler critical force with the independent segment. The flexible support distance is obtained by setting the integrated stiffness matrix zero, which is equivalent to structural instability. The order of the overall stiffness matrix is big when the tower crane is attached many times. In order to calculate more convenient for solving the matrix determinant, a transfer matrix method is adopted. To verify the influence of the flexibility caused by the support device, an example is carried out by both rigid and flexible support situations for this purpose, and the support spacing is computed numerically. Numerical results for the support distances of a tower crane will be presented and discussed.
Authors: Bo Tan
Abstract: Flexible supporting is a kind of treatment more reasonable than rigid supporting for dealing with the landslide of expansive soil cut slope. Base on flexible supporting treatment mechanism, a corresponding finite element calculation method is established. Take into consideration reasonably the expansion force, use nodal force to simulate interaction between the geotechnical grille and expansive soil. Calculation results agree with the actual situation, and have provided a theory basis for flexible supporting reasonable size of design.
Authors: Yue Hua Wang, Wei Yuan, Ya Nong Chen
Abstract: This document concentrates on the relationship between critical speeds and geometrical dimensions such as length, outer diameter, thickness, support stiffness and so on. An effective method was summarized for helicopter tail drive shaft system rotor dynamic design. A tail drive shaft system designed by this method was mounted in a helicopter and performed its first flight-test successfully. According to the feedback of tests in the air or on test bench, the vibration level of this shaft system was very low and rightly met the design requirements.
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