Papers by Keyword: Path Prediction

Abstract: It is known that fatigue crack path has an influence on the fatigue life of the structural components. In this study, a method of predicting the crack path is developed based upon superposition of a stress intensity factor (Green’s function solution) for the crack problem subjecting to a pair of concentrated loads. This method has a benefit to give us a complete closed crack path solution, and it is easy to predict the complex crack path in comparison with a numerical prediction by finite element (FE) analysis.

Abstract: In this paper, we propose a path prediction approach using behavioral data of user that it contains the meaningful locations extracting and predicting method. The proposed method has a difference to the previous methods that is considering the interaction data for defining the meaningful location and predicting the future paths. Using these interaction and path data, the proposed method calculates the proximities of adjacency people. For extracting the meaningful locations, we consider the calculated proximity of people around user and stay time based on path data. And we simplify the paths using these extracted meaningful locations. Finally, in prediction step, the method predicts the destination using the simplified paths, and finds detail path from current location to destination using modified Dynamic Time Warping (DTW) algorithm. For verifying the usability of proposed method, first, we analyze the effect of people around the user for predicting the future paths of user. We verify the effectiveness of the proposed method by comparing the prediction accuracies of each method.

Abstract: Many safety applications needed safety warning information to be disseminated to all vehicles in an area quickly. A path prediction model was built from the fused evidences by evidence theory, in which the basic probability assignment function of the local load and the old path load could be achieved using fuzzy set. And the loads became the evidences of the dissemination path prediction respectively. The prediction result with the maximal confidence was regarded as the quasi-real-time dissemination path load. Simulations show that the average end-to-end delay of safety information under heavy load with path prediction is less than the half of the delay without path prediction. However, the average packets loss rate of two schemes is almost the same.

Abstract: Composite damage modelling with cohesive elements has initially been limited to the analysis of interface damage or delamination. However, their use is also being extended to the analysis of inplane tensile failure arising from matrix or fibre fracture. These interface elements are typically placed at locations where failure is likely to occur, which infers a certain a priori knowledge of the crack propagation path(s). In the case of a crack jump for example, the location of the jump is usually not obvious, and the simulation would require the placement of cohesive elements at all element faces. A better option, presented here, is to determine the potential location of cohesive elements and insert them during the analysis. The aim of this work is to enable the determination of the crack path, as part of the solution process. A subroutine has been developed and implemented in the commercial finite element package ABAQUS/Standard[1] in order to automatically insert cohesive elements within a pristine model, on the basis of the analysis of the current stress field. Results for the prediction of delamination are presented in this paper.