scholarly journals Reliable Design: Basic Approach

2018 ◽  
Vol 198 ◽  
pp. 02006 ◽  
Author(s):  
Jiří Stodola ◽  
Jan Furch
Keyword(s):  
Safety Margin ◽  
Stochastic Approach ◽  
Distribution Law ◽  
Reliability Design ◽  
Fault Resistance ◽  
Practical Engineering ◽  
Operating Stress ◽  
Reliable Design ◽  
Ultimate Condition ◽  
Production Probability

The knowledge and experience learnt from product designing have resulted in development of their reliability theory. The classical concept of safe – life is based on product over dimensioned design that considers safety factor or safety margin for measure. However, practical engineering has found this concept in a manner inconvenient as design fault-resistance to determine the ultimate condition and operating stress are random values. A way out is in the concept of stochastic approach to reliability design resulting from the defect-production probability distribution law. That concept allows product designing with predetermined reliability, such as in the example contained in this paper.

scholarly journals Reliability Modeling and Assessment of Component with Multiple Weak Sites under Complex Loading

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Wenxue Qian ◽  
Xiaowei Yin ◽  
Liyang Xie
Keyword(s):  
Static Loading ◽  
Safety Margin ◽  
Complex Loading ◽  
The Other ◽  
Reliability Model ◽  
Reliability Modeling ◽  
Component Reliability ◽  
Reliability Design ◽  
Practical Engineering ◽  
Weak Site

A component with multiple weak sites is widely used in practical engineering and the existence of multiple weak sites can significantly decrease the component reliability. On the other hand, only a few components bear static loading and most components bear dynamic loading. In this paper, a reliability model of isomorphic component with multiple weak sites is built based on an order statistics model and the influences of strength decentrality and loading decentrality on isomorphic component with multiple weak sites are discussed. Furthermore the influence of loading times is studied in detail. The results show that unlike a component with only one weak site, not only does the failure of a component with multiple weak sites have a relationship with the safety margin, but there also exist relationships with the number of weak sites, the loading roughness, and loading times. The work in this paper is of some guiding significance in reliability design and assessment of a component with multiple weak sites under complex loading.

Recent advances in reliability analysis of aeroengine rotor system: a review

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xue-Qin Li ◽  
Lu-Kai Song ◽  
Guang-Chen Bai
Keyword(s):  
Reliability Analysis ◽  
Surrogate Model ◽  
Engineering Application ◽  
Rotor System ◽  
Engineering Structures ◽  
Content Type ◽  
Reliability Design ◽  
Rotor Systems ◽  
Practical Engineering ◽  
Complex Engineering

PurposeTo provide valuable information for scholars to grasp the current situations, hotspots and future development trends of reliability analysis area.Design/methodology/approachIn this paper, recent researches on efficient reliability analysis and applications in complex engineering structures like aeroengine rotor systems are reviewd.FindingsThe recent reliability analysis advances of engineering application in aeroengine rotor system are highlighted, it is worth pointing out that the surrogate model methods hold great efficiency and accuracy advantages in the complex reliability analysis of aeroengine rotor system, since its strong computing power can effectively reduce the analysis time consumption and accelerate the development procedures of aeroengine. Moreover, considering the multi-objective, multi-disciplinary, high-dimensionality and time-varying problems are the common problems in various complex engineering fields, the surrogate model methods and its developed methods also have broad application prospects in the future.Originality/valueFor the strong demand for efficient reliability design technique, this review paper may help to highlights the benefits of reliability analysis methods not only in academia but also in practical engineering application like aeroengine rotor system.

Research on Parameters of RC Structure Reliability

2014 ◽  
Vol 501-504 ◽  
pp. 1061-1064
Author(s):  
Bin Cai ◽  
Xin Hui Liu
Keyword(s):  
Reinforced Concrete ◽  
Structural Reliability ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Engineering Structures ◽  
Reliability Design ◽  
Structure Reliability ◽  
Rc Structure ◽  
Practical Engineering ◽  
Materials Used

In the analysis of engineering structures are usually adopt the method of fixed value, that is the practical engineering structure under load and the performance of materials used by structure shall be treated as a constant value.But, in fact, the structure of geometry size, bear the load, material parameters,computing model and so on are affected by various factors. In order to more accurately reflect the reliability problems of reinforced concrete structures, this paper, the factors above will be regarded as random variables, combining the basic theory of reliability design, through the probability analysis, in normal uselimit state reliability of reinforced concrete structures for example analysis of the influence of related parameters on the structural reliability.

Wind-Induced Dynamic Analysis and Construction Measures of Large Diameter Spherical Tank

2013 ◽  
Vol 351-352 ◽  
pp. 46-49
Author(s):  
Bao Hui Xu ◽  
Jing Ji
Keyword(s):  
Simulation Analysis ◽  
Large Diameter ◽  
Wind Load ◽  
Distribution Law ◽  
Finite Element Software ◽  
Spherical Tank ◽  
Actual Design ◽  
Tank System ◽  
Practical Engineering ◽  
Large Spherical

It is easy for the bulky spherical tank to take place wind-induced buckling under wind load, combined with the Daqing region specific practical engineering, simulation analysis of spherical tank system with 15.7m under random wind loads has been carried out by using ANSYS finite element software. The author investigates the mechanical properties of spherical tanks with the actions of self-weight and wind load, and obtains the deformation and stress distribution law of the tank, pillars and drawbars, at last construction suggestions of spherical tank is given, and these can provide technical support for improving the actual design for large spherical tank.

Analysis of Bearing Capacity for Quicklime Compaction Pile Composite Foundation

2013 ◽  
Vol 671-674 ◽  
pp. 10-13 ◽  
Author(s):  
Yong Qiang He ◽  
Bin Can Liu ◽  
Bao Ping Jiao ◽  
Ji Zhong Gan
Keyword(s):  
Bearing Capacity ◽  
Influencing Factors ◽  
Calculation Method ◽  
Soil Compaction ◽  
Composite Foundation ◽  
Reliability Design ◽  
Collapsible Loess ◽  
Practical Engineering

In the collapsible loess of Midwest China, quicklime compaction pile composite foundation has been widely used in practical engineering. Firstly，the calculation method of quicklime compaction pile composite foundation is analyzed; then the influencing factors of bearing capacity for quicklime compaction pile composite foundation was researched on the basis of the character about soil compaction effect between piles with the quicklime expanding when absorbing water from the soil; lastly, the calculation method was used in practical engineering, the results can be used to reference in reliability design application of composite foundation.

Mechanism Movement Reliability Analysis of Galting Gun

2012 ◽  
Vol 605-607 ◽  
pp. 802-805
Author(s):  
Xiao Ming Han ◽  
Yu Cheng Bo ◽  
Qiang Li ◽  
Yun Jian Guo
Keyword(s):  
Reliability Analysis ◽  
Parametric Model ◽  
Design Parameters ◽  
Distribution Law ◽  
Development Environment ◽  
Reliability Design ◽  
Movement Error ◽  
Design Variables ◽  
Analysis Theory ◽  
Movement Characteristic

In order to improve mechanism movement reliability of galting gun, through analyzing functions at different periods of mechanism movement course and basing on reliability, mechanism kinematics and movement error analysis theory, design variables which affect mechanism movement reliability are sampled according to distribution law. Using VC++ development environment and MFC class library’s supporting and putting parametric model into ADAMS software, mechanism movement characteristic at different design parameters is emulation calculated. According to emulation results mechanism movement reliability is estimated and all design parameters’ sensibility is analyzed, which realizes mechanism movement reliability analysis based on parametric model and provides a useful exploration for galting gun’s reliability design.

The Strength Analysis of Pre-Tightening Force on Covering Pipe-Ear

2015 ◽  
Vol 741 ◽  
pp. 171-174
Author(s):  
Hong Wei Wang ◽  
Gan Zhou ◽  
Mei Juan Zhou
Keyword(s):  
Aluminum Alloy ◽  
Element Model ◽  
Static Strength ◽  
Strength Analysis ◽  
Distribution Law ◽  
Line System ◽  
Reliability Design ◽  
Tightening Force ◽  
Ice Load ◽  
The Finite Element Model

The covering pipe-ear is one of the important components of the overhead contact line system (OCS) for supporting loads. The finite element model of covering pipe-ear was established, as the pre-tightening force, wind load and ice load all have effect on it, the stress distribution law were simulated under 12 kinds of loading conditions. The results show that the pre-tightening force has remarkable influence on covering pipe-ear and 2500N pre-tightening force is appropriate for the aluminum alloy covering pipe-ear. It is useful for the catenary components static strength reliability design.

Research on the Underground Pressure Behavior Law of Repeated Mining Working Face under the Gob of Small Colliery

2014 ◽  
Vol 522-524 ◽  
pp. 1434-1440
Author(s):  
Chun Xiang Hu ◽  
Jin Kai Liu ◽  
Qi Li ◽  
Yong Zhang
Keyword(s):  
Lower Layer ◽  
Measurement Data ◽  
Simulation Software ◽  
Efficient Production ◽  
Distribution Law ◽  
Pressure Behavior ◽  
Safe Production ◽  
Working Face ◽  
Practical Engineering ◽  
Residual Coal

The gob of small colliery has been one of the main factors threatening the safe production of coal mine. The repeated mining working face in a certain mine is the practical engineering background in this paper to study the influence of gob in small colliery on the mining of lower layer. By using the numerical simulation software FLAC3D, the stress distribution law and the change of displacement during lower layer mining were analysed. It can be concluded from the analysis of field measurement data that: there is stress relief under the gob of small colliery because the distribution of coal is irregular resulting from the random distribution of gobs in small colliery, while the residual coal causes the effect of stress concentration on the lower layer mining; relatively large displacement appears in the caving zone of the upper layer by the roof of working face and the support should be strengthened appropriately during mining; meanwhile, the gob of small colliery can cause the nonuniform distance of periodic weighting in the roof, and segmented pressure behavior can be observed during the periodic weighting of the working face. Research results could provide some guidance to the safe and efficient production in repeated mining working face in the mining with similar conditions.

Conformation Optimization Based on Impulse Grounding Resistance for Ground Electrode of Power Lines

2014 ◽  
Vol 986-987 ◽  
pp. 1930-1933
Author(s):  
Guang Zu Ge ◽  
Bo Tang ◽  
Zi Hang Qu ◽  
Yu Li ◽  
Bin Chen
Keyword(s):  
Safety Margin ◽  
Effective Area ◽  
Power Lines ◽  
Calculation Formula ◽  
Grounding Resistance ◽  
Practical Engineering ◽  
Coefficient Method

Reducing tower ground’s impulse grounding resistance can prevent the power lines from lightning effectively. The concept of impulse grounding resistance is described. Calculation formula of the impulse grounding resistance for ground electrode in different Conformations is derived with impulse coefficient method. The conformation of the ground electrode is improved according to the theory of impulse grounding resistance is decreased when the effective area of the electrode is reduced, using ETAP for simulation of the improved ground electrode. The results show that the impulse grounding resistance of the improved ground electrode can be reduced to 41.1% of the original, and safety margin is larger in practical engineering.

3D Visual Parametric Reliability Design System Development of Flange Based on ProEngineer

2010 ◽  
Vol 118-120 ◽  
pp. 116-120
Author(s):  
Xiao Wei Yin ◽  
Wen Xue Qian ◽  
Li Yang Xie
Keyword(s):  
3D Modeling ◽  
System Development ◽  
3D Models ◽  
Design System ◽  
Labor Intensity ◽  
Reliability Design ◽  
Common Part ◽  
Parametric Reliability ◽  
Mining Machinery ◽  
Practical Engineering

Flange is a common part in engineering, and it is tedious to build the 3D models of flanges repeatedly. Nowadays 3D modeling softwares are widely used in many engineering fields such as mining machinery, transportation and petrochemical. In practical engineering, it is necessary to compute the reliability of a flange. For these reasons a reliability design system of flange was developed with VC and Protoolkit. In this system, we only need to input several parameters to build a flange model and to compute its reliability. Also it is easy to determine the key sizes of a flange with an appointed reliability. The application of the software shown that using the software can improve the work efficiency and decrease the labor intensity of designers.

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