The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Analysis of fatigue crack growth has undergone several developments in the past few decades. In general, fatigue crack growth is studied using deterministic models from either single or multiple crack growth rate tests. Realizing that several variables influence fatigue crack growth, such as, microstructure, crack length measurement techniques, it is pertinent to assess crack growth using probabilistic...
This paper combined the finite element method with theory of reliability design and applied the PDS module of ANSYS to establishing 3D parameterized model of shield cutter. What's more, it compiled the APDL command flow and obtained the reliability documents to analysing the reliability of shield cutter. It can be obtained the reliability of shield cutter and influence degree of different parameters...
Aiming at reliability analysis problems with implicit performance functions and strongly nonlinear features in the pavement engineering, a new method for reliability analysis based on mente carlo(MC) theory and support vector machine(SVM) is developed. Due to strongly nonlinear mapping ability of SVM, the SVM model is employed to establish the nonlinear mapping relationship between basic random variables...
In this paper, the fracture problems appearing in operation and the reasons of the welded bogie frames of railway vehicles were explained firstly, and the current design situation of fatigue life and reliability of bogie frame were summarized. The railway vehicle design standard, which plays a decisive role in the bogie frame design, was analyzed. The traditional determining value method by using...
As demand for highly reliable complex systems increases, engineers are being forced to consider the risk implications of design decisions earlier in the conceptual phase of projects and with greater accuracy. Standard probabilistic risk assessments (PRA) usually employed to verify that a product meets requirements are too resource intensive and too slow to keep up with the speed at which the design...
Mechanical components design is subjected to uncertainties in material and geometrical properties, loads and other variables. For reliability optimization design with uncertain parameters, based on the non-probabilistic reliability theory, robust design and optimal design method, the uncertain parameters of mechanical components are expressed by non-probabilistic interval variables, and a non-probabilistic...
High Reliability and operational safety are most important requirements of an aerospace product. Many aerospace standard guidelines are followed during design phases and after many iterations the product parameters are established. The conventional design practices do not take variability in to account. Probabilistic structural analysis, unlike traditional methods, provides a means to quantify the...
This paper proposes a procedure to the robust design of composite laminates with initial imperfection under probabilistic considerations. A probability progressive failure mode of composite laminates is adopted to evaluate the structural reliability. The initial imperfection, strength parameters are considered as random variables, matrix cracking and fiber breaking are defined as the two basic failure...
The allocation of components to systems remains a challenge due to the components success and failure rate which is unpredictable to design engineers. Optimal algorithms often assume a restricted class for the allocation and yet still require a high-degree polynomial time complexity. Heuristic methods may be time-efficient but they do not guarantee optimality of the allocation. This paper introduces...
This paper addresses the comparative characteristic deflection and serviceability analysis in limit state of deflection of beam designed for given action in four different ways. The displacement samples for each beam for given loadings conditions, spans, are generated by simulation technique. Obtained samples are modeled with lognormal probability distributions. With the means and standard deviations...
A new NASA approach to launch vehicle (LV) design and development is recommended, which will increase human rated LV reliability in the future. At its core, the new approach includes probabilistic modeling and simulation methods, which will enable the low design margins and large loading uncertainties inherent in LVs to be quantified and addressed, like they have not been on past LV programs. In order...
This paper presents an overview of the Probabilistic Technology. The approach was demonstrated using the Probabilistic Transient Dynamic Impact Analysis of PA103E2 IM Container. The analysis results of indicate that the PA103E2 IM Container has a lower bound reliability. While there were 20 design variables involved in the analysis, the system reliability is only sensitive to 3 variables including...
Maintenance, inspection, and repair are key aspects of managing the structural integrity of ship systems in a life cycle framework. For example, an inspection program can be developed with the objective of maintaining the structural integrity of a ship. It can start with system definition, followed by qualitative reliability assessment, and then quantitative reliability assessment with the objective...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.