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.
Based on the first-passage failure and the accumulative fatigue damage rule, the dynamic strength reliability and parameter sensitivity of an aircraft fuel pipe system under a random load is discussed in this paper. To calculate the structural dynamic strength reliability, a method which combined the random vibration spectrum analysis, dynamic strength reliability theory and the sensitivity analysis...
Prediction of future health state of an aerospace structure allows airlines to plan repair or replacement activities well in time. Correct planning ensures low probability of failure as well as low aircraft's downtime. Accurate prediction is possible through usage of the effective prognostic algorithms, based on historical trends and underlying suitable degradation models. A particle filter (PF)-based...
In this paper, a dynamic reliability based design optimization problem of the lifting gear transmission system is formulated and solved. We focus on two issues in the design process, one is the excitations of the lifting gear transmission system, the random speed input, time variant meshing stiffness, dynamic loads are analyzed. The other is two kinds of reliability constraints, time-invariant reliability...
Life prediction and failure analysis are necessary and critical for the aeronautical structures. In this paper, a general method is proposed to predict the fatigue life of smooth and circular-hole specimens using the equivalent initial flaw size (EIFS) concept. The proposed methodology is based on a previously developed method. Fatigue limit and threshold stress intensity factor are used to predict...
Despite all the today's effort, devices and systems that underwent the highly popular highly-accelerated-life-testing (HALT), passed the existing qualification tests (QT) and survived the burn-in testing (BIT), often fail in the field. Are these tests, specifications and practices adequate? If not, could they be improved to an extent that for a product that passed the QT and survived the appropriate...
Based on the wave equation of longitudinal vibration, the simulation model of cyclic stress properties for sucker rod is proposed. The regression model for stress concentration factor of rods with defects is established by the finite element method. According to the influence of transition section on fatigue limit and service life on the degree of damage, combining the randomness of material mechanical...
Semiconductor component manufacturers supply to different product manufacturers in a wide range of market segments, for different end use applications. The goal of electronic component qualification is to demonstrate component reliability under operating conditions in the end product configuration. While a manufacturer may have successfully qualified an individual component, operating stresses due...
According to the conventional structure reliability theory, the bigger stress than the fatigue limit will bring some damage which can be accumulated. When the stress is smaller than the fatigue limit, there will be no damage to the structure. The model uncertainty can not be disposed very well by the conventional fatigue reliability theory. Fuzzy math theory can be used to describe the model uncertainty...
The omni-axis random vibration environment characteristics of repetitive shock machine, a new vibration equipment for reliability enhancement testing, is roundly studied. Firstly the omni-axis vibration acceleration is sampled by using triple axis accelerator under different intensity of vibration. Secondly the all-sided characteristics of the vibration signal is extracted according to related index...
Metal fatigue is one of the most important failure modes to be considered in mechanical and structural design. The only satisfactory way to prevent fatigue failures in the service life span is by proper design; i.e., being able to predict the fatigue lifetime of a particular design through design analysis or testing. For engineering applications, designers need a simple and reasonably accurate design...
Design for thermo-mechanical reliability of electronics components on the basis of parameterized Finite Element Models and DoE/RSM-approaches (Design of Experiments/Response Surface Methods) are more and more performed for optimizations at early phases of the product development process. This is especially the case for electronic components in the fields of RF (Radio Frequency), optoelectronics, high...
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.