Topic
Obstacle
About: Obstacle is a research topic. Over the lifetime, 9517 publications have been published within this topic receiving 94760 citations. The topic is also known as: impediment & barrier.
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TL;DR: In this paper, an approximate analysis for the propagation of water waves past long obstacles by considering separately the effects of diffraction at each end is presented. But this analysis is restricted to the case of a rectangular obstacle.
Abstract: An approximate analysis is developed for the propagation of water waves past long obstacles by considering separately the effects of diffraction at each end. The motion is two-dimensional, and linearized potential flow is assumed. Reflexion and transmission coefficients are obtained for the long obstacle, and it is shown that for suitably chosen values of the obstacle length there is complete transmission due to interference between the two ends. A comparison is made with experiments for the case of a rectangular obstacle.
120 citations
TL;DR: A novel control scheme for some problems on tracking and obstacle avoidance of a wheeled mobile robot with nonholonomic constraint is presented and an extended state observer is introduced to estimate the unknown disturbances and velocity information of the wheeling mobile robot.
Abstract: This brief presents a novel control scheme for some problems on tracking and obstacle avoidance of a wheeled mobile robot with nonholonomic constraint. An extended state observer is introduced to estimate the unknown disturbances and velocity information of the wheeled mobile robot. A nonlinear controller is designed to achieve tracking target and obstacle avoidance in complex environments. Note that tracking errors converge to a residual set outside the obstacle detection region. Moreover, the obstacle avoidance is also guaranteed inside the obstacle detection region. Simulation results are given to verify the effectiveness and robustness of the proposed design scheme.
120 citations
TL;DR: In this paper, a numerical simulation of forced convective, incompressible flow in a channel with an array of heated obstacles attached to one wall is presented, and three levels of Nusselt numbers are emphasized in this systematic analysis: local distributions along the obstacle exposed faces, mean values for individual faces, and overall obstacle mean values.
120 citations
Patent•
27 Dec 2004
TL;DR: In this paper, the traveling state of an own vehicle is detected (steps S1 and S2), and forward obstacle data detected by an obstacle sensor 3, approaching vehicle information acquired from infrastructure facilities arranged in a traveling road by a road-to-vehicle radio device 4, traveling information of vehicles in a V2V communication destination, acquired by a vehicle-tovehicle radios device 5, and the like are read (step S3 to S5).
Abstract: PROBLEM TO BE SOLVED: To perform a driving support of further high level even in a complicated traffic environment such as an intersection or T-shaped intersection. SOLUTION: The traveling state of an own vehicle is detected (steps S1 and S2), and forward obstacle data detected by an obstacle sensor 3, approaching vehicle information acquired from infrastructure facilities arranged in a traveling road by a road-to-vehicle radio device 4, traveling information of vehicles in a vehicle-to-vehicle communication destination, acquired by a vehicle-to-vehicle radio device 5, and the like are read (steps S3 to S5). With respect each detection means of the obstacle sensor 3, the road-to-vehicle radio 4 and the vehicle-to-vehicle radio 5, the sum of a multi-level showing the number of detection means in detection of the same object by different detection means and the reliability set to the detection means which is detecting an object is determined, and a total reliability is determined based on the resulting reliability (step S6). As higher reliability is predicted from the total reliability, driving support of higher level is performed. COPYRIGHT: (C)2006,JPO&NCIPI
118 citations