The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Brendan P. Williams - One of the best experts on this subject based on the ideXlab platform.
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Optimal Bearing-Only-Information Strategy for Unmanned Aircraft Collision Avoidance
Journal of Guidance Control and Dynamics, 2020Co-Authors: Timothy L. Molloy, Tristan Perez, Brendan P. WilliamsAbstract:This paper presents a novel collision-avoidance strategy for unmanned aircraft detect and avoid that requires only information about the Relative Bearing angle between an aircraft and hazard. It is...
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An Optimal Bearing-Only-Information Strategy for Unmanned Aircraft Collision Avoidance
2020Co-Authors: Timothy L. Molloy, Tristan Perez, Brendan P. WilliamsAbstract:This paper presents a novel collision avoidance strategy for unmanned aircraft detect and avoid that requires only information about the Relative Bearing angle between an aircraft and hazard. It is shown that this Bearing-only strategy can be conceived as the solution to a novel differential game formulation of collision avoidance, and has several intuitive properties including maximising the instantaneous range acceleration in situations where the hazard is stationary or has a finite turn rate. The performance of the Bearing-only strategy is illustrated in simulations based on test cases drawn from draft minimum operating performance standards for unmanned aircraft detect and avoid systems.
Timothy L. Molloy - One of the best experts on this subject based on the ideXlab platform.
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Optimal Bearing-Only-Information Strategy for Unmanned Aircraft Collision Avoidance
Journal of Guidance Control and Dynamics, 2020Co-Authors: Timothy L. Molloy, Tristan Perez, Brendan P. WilliamsAbstract:This paper presents a novel collision-avoidance strategy for unmanned aircraft detect and avoid that requires only information about the Relative Bearing angle between an aircraft and hazard. It is...
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An Optimal Bearing-Only-Information Strategy for Unmanned Aircraft Collision Avoidance
2020Co-Authors: Timothy L. Molloy, Tristan Perez, Brendan P. WilliamsAbstract:This paper presents a novel collision avoidance strategy for unmanned aircraft detect and avoid that requires only information about the Relative Bearing angle between an aircraft and hazard. It is shown that this Bearing-only strategy can be conceived as the solution to a novel differential game formulation of collision avoidance, and has several intuitive properties including maximising the instantaneous range acceleration in situations where the hazard is stationary or has a finite turn rate. The performance of the Bearing-only strategy is illustrated in simulations based on test cases drawn from draft minimum operating performance standards for unmanned aircraft detect and avoid systems.
Robert C. Hendricks - One of the best experts on this subject based on the ideXlab platform.
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Wave Journal Bearings Under Dynamic Loads
2002Co-Authors: Florin Dimofte, Robert C. HendricksAbstract:The dynamic behavior of the wave journal Bearing was determined by running a three-wave Bearing with an eccentrically mounted shaft. A transient analysis was developed and used to predict numerical data for the experimental cases. The three-wave journal Bearing ran stably under dynamic loads with orbits well inside the Bearing clearance. The orbits were almost circular and nearly free of the influence of, but dynamically dependent on, Bearing wave shape. Experimental observations for both the absolute Bearing-housing-center orbits and the Relative Bearing-housing-center-to-shaft-center orbits agreed well with the predictions. Moreover, the subsynchronous whirl motion generated by the fluid film was found experimentally and predicted theoretically for certain speeds.
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Three-wave gas journal Bearing behavior with shaft runout
NASA Conference Publication, 1997Co-Authors: Florin Dimofte, Robert C. HendricksAbstract:Experimental orbits of a free-mounted, three-wave gas journal Bearing housing where recorded and compared to transient predicted orbits. The shaft was mounted eccentric with a fixed runout. Experimental observations for both the absolute Bearing housing center orbits and the Relative Bearing housing center to shaft center orbits are in good agreement with the predictions. The sub-synchronous whirl motion generated by the fluid film was found experimentally and predicted theoretically for certain speeds. A three-wave journal Bearing can run stably under dynamic loads with orbits well inside the Bearing clearance. Moreover, the orbits are almost circular free of the influence of Bearing wave shape.
Wang Yong-ji - One of the best experts on this subject based on the ideXlab platform.
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Sliding Mode Control for Nonholonomic Mobile Robot Formation
Robot, 2006Co-Authors: Yu Hui, Wang Yong-jiAbstract:A nonlinear sliding mode controller is proposed to coordinate a group of nonholonomic mobile robots so that a desired formation can be achieved.By using sliding mode control approaches,we consider a two-vehicle team in leader-(follower) configuration that is required to follow a prescribed trajectory while maintaining a desired Relative distance,Relative Bearing angle and heading orientation.Stability of the closed-loop system are studied using classical Lyapunov theory.We prove theoretically that under certain reasonable assumptions the formation is asymptotically stable even with bounded disturbances;that is,the proposed sliding mode controller can asymptotically stabilize the errors in Relative distance,Relative Bearing and heading direction,respectively.Finally,a numerical simulation example is given for the two-robot case to verify the validity of our approach.
Tristan Perez - One of the best experts on this subject based on the ideXlab platform.
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Optimal Bearing-Only-Information Strategy for Unmanned Aircraft Collision Avoidance
Journal of Guidance Control and Dynamics, 2020Co-Authors: Timothy L. Molloy, Tristan Perez, Brendan P. WilliamsAbstract:This paper presents a novel collision-avoidance strategy for unmanned aircraft detect and avoid that requires only information about the Relative Bearing angle between an aircraft and hazard. It is...
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An Optimal Bearing-Only-Information Strategy for Unmanned Aircraft Collision Avoidance
2020Co-Authors: Timothy L. Molloy, Tristan Perez, Brendan P. WilliamsAbstract:This paper presents a novel collision avoidance strategy for unmanned aircraft detect and avoid that requires only information about the Relative Bearing angle between an aircraft and hazard. It is shown that this Bearing-only strategy can be conceived as the solution to a novel differential game formulation of collision avoidance, and has several intuitive properties including maximising the instantaneous range acceleration in situations where the hazard is stationary or has a finite turn rate. The performance of the Bearing-only strategy is illustrated in simulations based on test cases drawn from draft minimum operating performance standards for unmanned aircraft detect and avoid systems.