Multi-condition optimization design of main load bearing structure of optical small satellite

2017 ◽  
Vol 46 (12) ◽  
pp. 1218004
Author(s):  
谭陆洋 Tan Luyang ◽  
王 栋 Wang Dong ◽  
李 林 Li Lin ◽  
谷 松 Gu Song ◽  
孔 林 Kong Lin
Keyword(s):  
Optimization Design ◽  
Small Satellite ◽  
Load Bearing ◽  
Condition Optimization ◽  
Bearing Structure

scholarly journals Reliability as a Key Driver for a Sustainable Design of Adaptive Load-Bearing Structures

2022 ◽  
Vol 14 (2) ◽  
pp. 895
Author(s):  
Dshamil Efinger ◽  
Andreas Ostertag ◽  
Martin Dazer ◽  
David Borschewski ◽  
Stefan Albrecht ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Construction Materials ◽  
Internal Stresses ◽  
Elastic Model ◽  
Load Spectrum ◽  
Operating Life ◽  
Load Bearing ◽  
Linear Elastic ◽  
High Rise ◽  
Bearing Structure

The consumption of construction materials and the pollution caused by their production can be reduced by the use of reliable adaptive load-bearing structures. Adaptive load-bearing structures are able to adapt to different load cases by specifically manipulating internal stresses using actuators installed in the structure. One main aspect of quality is reliability. A verification of reliability, and thus the safety of conventional structures, was a design issue. When it comes to adaptive load-bearing structures, the material savings reduce the stiffness of the structure, whereby integrated actuators with sensors and a control take over the stiffening. This article explains why the conventional design process is not sufficient for adaptive load-bearing structures and proposes a method for demonstrating improved reliability and environmental sustainability. For this purpose, an exemplary adaptive load-bearing structure is introduced. A linear elastic model, simulating tension in the elements of the adaptive load-bearing structure, supports the analysis. By means of a representative local load-spectrum, the operating life is estimated based on Woehler curves given by the Eurocode for the critical notches. Environmental sustainability is increased by including reliability and sustainability in design. For an exemplary high-rise adaptive load-bearing structure, this increase is more than 50%.

The Bridge over the Chomutovka River Valley

2017 ◽  
Vol 259 ◽  
pp. 130-134
Author(s):  
Radim Cihlář ◽  
Martin Nožička ◽  
Jakub Aubrecht
Keyword(s):  
Czech Republic ◽  
Pile Foundation ◽  
River Valley ◽  
Box Girder ◽  
The Czech Republic ◽  
Load Bearing ◽  
The Road ◽  
Planning Agency ◽  
The Village ◽  
Bearing Structure

The purpose of this article is to describe the construction of the bridge spanning the Chomutovka river valley as a part of the road I/27 bypassing the village of Velemyšleves. The investor of this project is Ředitelství silnic a dálnic ČR, správa Chomutov (Directorate for Roads and Motorways of the Czech Republic, division Chomutov). The general constructor of the entire project is the association of companies Silnice Group a.s. and AZ sanace a.s., the constructor of the foundations and the pile foundation is AZ Sanace a.s. and the constructor of the bridge is SMP CZ, a.s. The project execution documentation was carried out by the planning agency NOVÁK & PARTNER s.r.o. The designer and lead construction engineer of the project is Doc. Ing. Lukáš Vráblík, Ph.D.The structure is a seven-span bridge with a total length of 537 m. The load bearing structure, constructed using cantilever casting and supporting construction, consists of a seven-span continuous box girder with two frame connections. The whole structure is to be opened for public use by the end of this year.

scholarly journals Correction to: Stress and load-bearing structure analysis of the surrounding rock in a soft broken roadway

2020 ◽  
Vol 13 (23) ◽  
Author(s):  
Guangming Zhao ◽  
Chongyan Liu ◽  
Siming Kao ◽  
Xiaobo Zhang ◽  
Xiang Cheng
Keyword(s):  
Structure Analysis ◽  
Surrounding Rock ◽  
Load Bearing ◽  
Bearing Structure

scholarly journals Multiobjective Optimization Design for Structural Parameters of TBM Disc Cutter Rings Based on FAHP and SAMPGA

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Laikuang Lin ◽  
Yimin Xia ◽  
Dun Wu
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Structural Parameters ◽  
Rock Breaking ◽  
Ring Structure ◽  
Structure Design ◽  
Disc Cutter ◽  
Load Bearing ◽  
Geological Conditions ◽  
Weight Coefficients

As a key component of tunnel boring machines (TBMs), the disc cutter ring and its structural parameters are closely related to the TBM tunneling quality. Literature review shows that investigations on optimization design methods for cutter ring structure are seriously insufficient. Therefore, in this paper, a multiobjective optimization design model of structural parameters for disc cutter rings is developed based on the complex geological conditions and the corresponding cutter ring structure design requirements. The rock breaking capability, energy consumption, load-bearing capability, wear life, and wear uniformity of disc cutter are selected as the objectives, and the geometric structure of cutter rings, ultimate load-bearing capability, and cutterhead drive performance are determined as constraints. According to the characteristics of this model, a self-adaptive multipopulation genetic algorithm (SAMPGA) is utilized to solve the optimization problem, and the Fuzzy analytical hierarchy process (FAHP) is employed to calculate weight coefficients for multiple objectives. Finally, the applicability of the proposed method is demonstrated through a case study in a TBM project. The results indicated that the rock breaking performance and service life of the disc cutter are improved after optimization by using the proposed method. The utilization of SAMPGA effectively solves the premature local convergence problems during optimization. The geological adaptability should be considered in the cutter ring structure design, which can be realized by using the proposed method based on the suitable weight coefficients.

scholarly journals Influence of Load-bearing Structure on Size of Bonded Facade Cladding

2018 ◽  
Vol 163 ◽  
pp. 08003
Author(s):  
Pavel Liška ◽  
Barbora Nečasová ◽  
Jiří Šlanhof
Keyword(s):  
Aluminium Alloy ◽  
Bonded Joints ◽  
Test Results ◽  
Load Bearing ◽  
Moisture Expansion ◽  
Cladding Panels ◽  
People First ◽  
Materials Used ◽  
Bearing Structure ◽  
Modern Technologies

Architecture has been an integral part of our lives ever since people first existed. Structures are required by both investors and society to have what is considered a highly modern appearance while maintaining elements of a long service life. To meet such requirements, it is necessary to use modern technologies and materials. Bonded joints represent one of the options. Unlike with mechanical joints, it is possible to use bonded joints to anchor large format cladding panels to bearing substructures of various shapes and sizes. The design is simple, but very technically demanding to implement. One of the factors which have an impact on both the design and its implementation is the bearing substructure itself. As part of a research project, a load bearing substructure made from wood and aluminium alloy was tested. The test results prove that the mechanical properties of the materials used, especially their thermal and moisture expansion, directly influence the size of the cladding. In the case of a bearing substructure made from wood, the cladding may be larger by several percentage points than in the case of a bearing substructure made from aluminium alloy.

On mechanical models for tendon: addendum and corrigendum

1981 ◽  
Vol 211 (1184) ◽  
pp. 391-392 ◽  
Keyword(s):  
Mechanical Properties ◽  
Deformation Behaviour ◽  
Mechanical Deformation ◽  
Load Bearing ◽  
Mechanical Models ◽  
Tail Tendon ◽  
Bearing Structure ◽  
Published Paper ◽  
Rat Tail ◽  
Western Reserve

The purpose of this note is to comment on some models for the mechanical properties of tendon and to draw attention to a misprint in an earlier paper, Diamant et al , (1972), to which we were contributors. In the study published in 1972 we and our coauthors at Case Western Reserve University, Cleveland, Ohio, presented optical and mechanical evidence for a planar zig-zag model of the basic load-bearing structure in rat-tail tendon interpreting the mechanical deformation by the theory of the extensible elastica. Because of an unfortunate misprint in the published paper, the validity of the elastica model has been called into question, and other theories explaining the load deformation behaviour of tendon have been proposed (Lanir 1978; Comninou & Yannas 1976).

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