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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 the rocket transportation the road roughness load can cause its solid motor charge to vibrate randomly. To get information about the motor charge's dynamic characteristic and damage degree, this paper calculated the charge's vibration responses by road excitations on the numerical method of mechanical modeling. First the rocket launcher's simplified model was built and the transfer function was...
Estimating State-of-Health(SOH) for electric vehicle(EV) batteries is the most crucial to determine replacement time of the battery or to calculate driving mileage. However, partial charge and discharge, or steep changes of current loads imposed in EV increase estimation error. In this paper, we present a data-driven method for Battery Management System(BMS) to precisely estimate the SOH reflecting...
The focus of this work is on fatigue load modeling and controller design for the wind turbine level. The main purpose is to include a model of the damage effects caused by the fatigue of the wind turbine components in the controller design process. This paper addresses an online fatigue estimation method based on hysteresis operators, which can be used in control loops. Furthermore, we propose a model...
According to the aero-engines' flight hours and the speed cycle number, we can obtain the relationship between the load spectrum and the life of its main components; According to the analysis of actual measured load spectrum and the fatigue damage model, this paper adopts the S-N curve and Miner's rule to estimate the fatigue life of engine's first stage turbine disk.
Birnbaum-Saunders fatigue life distribution is one of the common distributions, the use of which in the accelerated life test is discussed in this paper. A regression model is established according to its characteristics. Then the parameters of accelerated model are obtained by means of best unbiased integral estimate method, which makes use of censored data in different stress levels as a whole....
It is general to evaluate strength of a structure by the strain and the stress obtained by using the finite element method. The strong shape can be derived for an over load when these evaluations are used. However, it is not an enough evaluation if it thinks from the viewpoint used in a mid/long term. In this paper, we propose the damage estimation algorithm which estimates the damage of the structure...
Fatigue strength is of prior concern for automotive chassis parts design. In a reliability framework, its assessment still requires long and expensive test campaigns. In particular, high-cycle endurance tests usually involve several specimens undergoing million-cycle procedures. In order to reduce the specimen number (e.g. expensive prototypes) and to shorten testing procedures (i.e. time-to-result...
Accelerated life testing (ALT) is used to get information quickly on life distributions. This study describes an accelerated life testing for fighter-bomber wheel hubs that is representative of actual service conditions. The acceleration models are proposed based on the fatigue life tests of 2014 aluminum alloy, which is extensively used to make fighter-bomber wheel hubs. The BLUE (best linear unbiased...
According to the essential reasons for equipments failure of diesel locomotive, the shortages of present calculating method of overhaul cycle of diesel locomotive are analyzed. Simultaneously, a new overhaul cycle model based on the stress analysis is presented. This model adopts Miner Criterion and reliability theory to estimate the equipmentspsila maintenance life-time of diesel locomotive and to...
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