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Articles 31 - 36 of 36
Full-Text Articles in Robotics
Dexterous Hexrotor Uav Platform, Guangying Jiang
Dexterous Hexrotor Uav Platform, Guangying Jiang
Electronic Theses and Dissertations
Mobile manipulation is a hot area of study in robotics as it unites the two classes of robots: locomotors and manipulators. An emerging niche in the field of mobile manipulation is aerial mobile manipulation. Although there has been a fair amount of study of free-flying satellites with graspers, the more recent trend has been to outfit UAVs with graspers to assist various manipulation tasks. While this recent work has yielded impressive results, it is hampered by a lack of appropriate testbeds for aerial mobile manipulation, similar to the state of ground-based mobile manipulation a decade ago. Typical helicopters or quadrotors …
Radar Based Collision Avoidance For Unmanned Aircraft Systems, Allistair A. Moses
Radar Based Collision Avoidance For Unmanned Aircraft Systems, Allistair A. Moses
Electronic Theses and Dissertations
Unmanned Aircraft Systems (UAS) have become increasingly prevalent and will represent an increasing percentage of all aviation. These unmanned aircraft are available in a wide range of sizes and capabilities and can be used for a multitude of civilian and military applications. However, as the number of UAS increases so does the risk of mid-air collisions involving unmanned aircraft. This dissertation aims present one possible solution for addressing the mid-air collision problem in addition to increasing the levels of autonomy of UAS beyond waypoint navigation to include preemptive sensor-based collision avoidance. The presented research goes beyond the current state of …
Reducing Communication Delay Variability For A Group Of Robots, Goncalo Martins
Reducing Communication Delay Variability For A Group Of Robots, Goncalo Martins
Electronic Theses and Dissertations
A novel architecture is presented for reducing communication delay variability for a group of robots. This architecture relies on using three components: a microprocessor architecture that allows deterministic real-time tasks; an event-based communication protocol in which nodes transmit in a TDMA fashion, without the need of global clock synchronization techniques; and a novel communication scheme that enables deterministic communications by allowing senders to transmit without regard for the state of the medium or coordination with other senders, and receivers can tease apart messages sent simultaneously with a high probability of success. This approach compared to others, allows simultaneous communications without …
Robot Team Formation Control Using Communication "Throughput Approach", Fatmazahra Ahmed Benhalim
Robot Team Formation Control Using Communication "Throughput Approach", Fatmazahra Ahmed Benhalim
Electronic Theses and Dissertations
In this thesis, we consider a team of robots forming a mobile robot network cooperating to accomplish a mission in an unknown but structured environment. The team has no a-priori knowledge of the environment. Robots have limited memory storage capabilities, not enough to map the environment. Each robot also has limited sensor capability and computational power. Due to the need to avoid obstacles and other environment effects, some robots get delayed from the rest. Using tracking controller, the robot team should follow the leader in a flexible formation shape without losing network connectivity, and that was achieved by monitoring the …
Reconode: Towards An Autonomous Multi-Robot Team Agent For Usar, Kang Li
Reconode: Towards An Autonomous Multi-Robot Team Agent For Usar, Kang Li
Electronic Theses and Dissertations
Urban search and rescue (USAR) robots can benefit from small size as it facilitates movement in cramped quarters. Yet, small size limits actuator power, sensor payloads, computational capacity and battery life. We are alleviating these issues by developing the hardware and software infrastructure for high performance, heterogeneous, dynamically-reconfigurable miniature USAR robots, as well as a host of other relevant applications. In this thesis, a generic modular embedded system architecture based on the RecoNode multiprocessor is proposed, which consists of a set of hardware and software modules that can be configured to construct various types of robot systems for dynamic and …
Heterogeneous Drive Mechanisms For Novel Locomotion In Rough Terrain, Roy Godzdanker
Heterogeneous Drive Mechanisms For Novel Locomotion In Rough Terrain, Roy Godzdanker
Electronic Theses and Dissertations
The smaller the robot the easier it is for it to access voids in a collapsed structure, however small size brings a host of other problems related to constrained resources. One of the primary constraints on small robots is limited motive power to surmount obstacles and navigate rough terrain. This thesis examines the addition of bulk motive force actuators to existing locomotion platforms and the impact of these heterogeneous actuators on conventional steering methods. The steering methods examined are those associated with skid steered vehicles and differential drive vehicles. In developing the Crabinator, a robot composed of a limbed crawler …