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The composite action of cross-laminated timber rib panels at elevated temperatures
(2021)In the frame of an ongoing research project, the fire behaviour and fire resistance of CLT rib panels are studied. The floor system consists of cross-laminated timber (CLT) plates rigidly bonded to glued-laminated timber ribs by means of screw-press gluing using a one-component polyurethane adhesive. The experimental programme comprised reference tests and fire tests for fire resistances up to 120 min. In addition to the reference tests, ...Conference Paper -
Online Informative Path Planning for Active Information Gathering of a 3D Surface
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)This paper presents an online informative path planning approach for active information gathering on three-dimensional surfaces using aerial robots. Most existing works on surface inspection focus on planning a path offline that can provide full coverage of the surface, which inherently assumes the surface information is uniformly distributed hence ignoring potential spatial correlations of the information field. In this paper, we utilize ...Conference Paper -
Crowd against the machine: A simulation-based benchmark tool to evaluate and compare robot capabilities to navigate a human crowd
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)The evaluation of robot capabilities to navigate human crowds is essential to conceive new robots intended to operate in public spaces. This paper initiates the development of a benchmark tool to evaluate such capabilities; our long term vision is to provide the community with a simulation tool that generates virtual crowded environment to test robots, to establish standard scenarios and metrics to evaluate navigation techniques in terms ...Conference Paper -
Generating Continuous Motion and Force Plans in Real-Time for Legged Mobile Manipulation
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)Manipulators can be added to legged robots, allowing them to interact with and change their environment. Legged mobile manipulation planners must consider how contact forces generated by these manipulators affect the system. Current planning strategies either treat these forces as immutable during planning or are unable to optimize over these contact forces while operating in real time. This paper presents the Stability and Task Oriented ...Conference Paper -
Learn to Path: Using neural networks to predict Dubins path characteristics for aerial vehicles in wind
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)For asymptotically optimal sampling-based path planners such as RRT*, path quality improves as the number of samples added to the motion tree increases. However, each additional sample requires a nearest-neighbor search. Calculating state transition costs can be particularly difficult in cases with complex dynamics such as aerial vehicles in non-isotropic cost fields like wind. Computationally costly nearest neighbor searches increase the ...Conference Paper -
Distributed Variable-Baseline Stereo SLAM from two UAVs
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)Visual Inertial Odometry (VIO) has been widely used and researched to control and aid the automation of navigation of robots especially in the absence of absolute position measurements, such as GPS. However, when the observable landmarks in the scene lie far away, as in high-altitude flights for example, the fidelity of the metric scale estimate in VIO greatly degrades. Aiming to tackle this issue, in this work, we utilize the virtual ...Conference Paper -
Imitation Learning from MPC for Quadrupedal Multi-Gait Control
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)We present a learning algorithm for training a single policy that imitates multiple gaits of a walking robot. To achieve this, we use and extend MPC-Net, which is an Imitation Learning approach guided by Model Predictive Control (MPC). The strategy of MPC-Net differs from many other approaches since its objective is to minimize the control Hamiltonian, which derives from the principle of optimality. To represent the policies, we employ a ...Conference Paper -
Efficient Multi-scale POMDPs for Robotic Object Search and Delivery
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)We present a novel hierarchical POMDP framework to solve an object search and delivery task where the agent is given a prior belief about the possible item locations. Solving POMDPs is computationally demanding and, as such, applications have typically been limited to small environments. The proposed hierarchical POMDP framework performs reasoning on multiple spatial scales in order to reduce computation time. The problem is first solved ...Conference Paper -
Direct Force and Pose NMPC with Multiple Interaction Modes for Aerial Push-and-Slide Operations
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)In this paper, we present a model predictive controller for a fully actuated aerial manipulator to track a hybrid force and pose trajectory at the end-effector in an aerial interaction task. A force sensor at the end-effector is used to detect contact and to directly control the interaction force. We propose an approach for automatic transition between three operation modes which reflect the state of contact constraints, including ...Conference Paper -
Active Model Learning using Informative Trajectories for Improved Closed-Loop Control on Real Robots
(2021)2021 IEEE International Conference on Robotics and Automation (ICRA)Model-based controllers on real robots require accurate knowledge of the system dynamics to perform optimally. For complex dynamics, first-principles modeling is not sufficiently precise, and data-driven approaches can be leveraged to learn a statistical model from real experiments. However, the efficient and effective data collection for such a data-driven system on real robots is still an open challenge. This paper introduces an ...Conference Paper