Papers by Keyword: Detection Accuracy

Abstract: A novel algorithm, which can check the collision point of rigid objects continuously and solve the problem of penetration and crossing in collision detection effectively, is presented in this paper. At each simulation moment, the adaptive test lines (ATLs) are first constructed based on the velocity vector of the moving object and then the intersection between the ATLs and the environment is calculated. The collision happens when the intersection is not empty and the collision point is obtained through crossing-frame processing. By checking the interference between body and ATLs instead of bodies, we greatly improve the detection efficiency. It avoids missing collisions for an object with arbitrary shape or in any motion states. Simulation results show that our algorithm runs faster than the general continuous collision detection algorithms and has similar detection effects to the swept volume algorithm.

Abstract: This work deals with the Liquid Resin Infusion (LRI) process developed within the research program “FUSelage COMPosite” of DAHER SOCATA. This manufacturing process enables the realization of complex composite structures or fuselage elements in a single phase (mono-material), which considerably reduce connections and relative difficulties. The concern here is the investigation of non destructive testing (NDT) methods that can be applied to LRI-structures in order to define their capacities for defect detection, and especially their associated critical defect size. In aviation industry, the AITM standards require the ultrasonic testing as NDT for composite materials. Therefore the aim of this work is to characterize and compare three different and complementary ultrasonic techniques on composite specimens. Such analysis allows to define the NDT application field of each method in term of defect detection.

Abstract: All aspects of measured process should be considered to minimize the negative influence then improve the GPR detection accuracy in the tunnel lining inspection. Take ChangBanPo tunnel test for example, in the case of not using measuring wheel, reducing the interpolation space improves accuracy of test data in the axial direction, and finally the positioning accuracy of the data is over 0.1m. By calculating the electromagnetic wave velocity of the end of the lining where the thickness is known, the velocity is used as the corresponding section of the lining ,which avoids the computational error by using dielectric constant and the error is controlled under the centimeter level.