In this article the modal analysis of a manipulator is presented and discussed from a theoretical and experimental perspective. the work focuses on boththe simulation and the experimental stages of the modal analysis...
详细信息
ISBN:
(纸本)9789897583803
In this article the modal analysis of a manipulator is presented and discussed from a theoretical and experimental perspective. the work focuses on boththe simulation and the experimental stages of the modal analysis on six DOF parallel kinematics machine. In particular, the behavioural vibrational trend of the kinematics structure under analysis is presented within the entire workspace. Critical aspects of each test phase are highlighted as well as data post processing methods used. Finally, a map capable of summarizing the modal analysis results is shown.
this paper deals withthe problem of automatic detection of offsets in GPS time series, which is of interest both in active volcanic and tectonic areas, where they often signal either the opening of eruptive fissures ...
详细信息
ISBN:
(纸本)9789897583803
this paper deals withthe problem of automatic detection of offsets in GPS time series, which is of interest both in active volcanic and tectonic areas, where they often signal either the opening of eruptive fissures or seismic and aseismic dislocations. the problem is tackled by using the Change Point Detection (CPD) approach. Results show that CPD algorithms are suitable both in off-line and on-line frameworks. In particular, we show that CPD algorithms could contribute to the implementation of a warning system of volcanic intrusive activity.
In this research, we focus on the 6D pose estimation of known objects from the RGB image. In contrast to state of the art methods, which are based on the end-to-end neural network training, we proposed a hybrid approa...
详细信息
ISBN:
(纸本)9789897583803
In this research, we focus on the 6D pose estimation of known objects from the RGB image. In contrast to state of the art methods, which are based on the end-to-end neural network training, we proposed a hybrid approach. We use separate deep neural networks to: detect the object on the image, estimate the center of the object, and estimate the translation and "in-place" rotation of the object. then, we use geometrical relations on the image and the camera model to recover the full 6D object pose. As a result, we avoid the direct estimation of the object orientation defined in SO3 using a neural network. We propose the 4D-NET neural network to estimate translation and "in-place" rotation of the object. Finally, we show results on the images generated from the Pascal VOC and ShapeNet datasets.
the problem of discrete-time multi-agent systems governed by general MIMO dynamics is addressed. By employing a PID-like distributed protocol, we aim to solve two relevant consensus problems, namely the leaderless con...
详细信息
ISBN:
(纸本)9789897583049
the problem of discrete-time multi-agent systems governed by general MIMO dynamics is addressed. By employing a PID-like distributed protocol, we aim to solve two relevant consensus problems, namely the leaderless consensus under disturbances and leader-follower under time-varying reference state ones. Sufficient conditions for stability as well as two LMI approaches to tune the controller gains are provided. the latter are either based on a H-infinity formulation of the problem or on fast response to a reference exogenous signal. Numerical simulations give some insight of which tuning should be considered according to the problem addressed.
the dynamic analysis is the basic element of the mechanical design and control of parallel mechanisms. the parallel robots dynamics requires a great deal of computing as regards the formulation of the generally nonlin...
详细信息
ISBN:
(纸本)9789898111319
the dynamic analysis is the basic element of the mechanical design and control of parallel mechanisms. the parallel robots dynamics requires a great deal of computing as regards the formulation of the generally nonlinear equations of motion and their solution. In this paper a solution for solving the dynamical model of a 6-DOF parallel structure destined to helicopter flight simulation is presented. the obtained dynamical algorithms, based on the kinematical ones, offer the possibility of a complex study for this type of parallel structure in order to evaluate the dynamic capabilities and to generate the control algorithms.
the inspection of large structures is increasingly carried out withthe help of Unmanned Aerial Vehicles (UAVs). When navigating relative to the structure, multiple data sources can be used to determine the position o...
详细信息
ISBN:
(纸本)9789897585227
the inspection of large structures is increasingly carried out withthe help of Unmanned Aerial Vehicles (UAVs). When navigating relative to the structure, multiple data sources can be used to determine the position of the UAV. Examples include track data from an installed camera and sensor data from the orientation sensors of the UAV. this paper deals withthe fusion of this data and its use for navigation alongside the structure. For the sensor fusion, a concept is developed using a Kalman filter and evaluated simulatively in a prototype. the calculated position data are also fed into a vector flight control system, which dynamically calculates and flies a trajectory along the component using the potential field method. this is done taking into account obstacles detected by the onboard sensors of the UAV. the established concept is then implemented withthe Robot Operating System (ROS) and evaluated simulatively.
Environmental research is an area where robotics platforms can be applied as solutions for different problems to help or automate certain tasks, withthe purpose of being more efficient or also safer for the researche...
详细信息
Environmental research is an area where robotics platforms can be applied as solutions for different problems to help or automate certain tasks, withthe purpose of being more efficient or also safer for the researchers involved. this paper presents the Kamanbare platform. Kamanbar6 is a bioinspired robotic platform, whose main goal is to climb trees for environmental research applications, applied in tasks such as gathering botanical specimen, insects, climatic and arboreal fauna studies, among others. Kamanbare is a platform that provides flexibility both in hardware and software, so that new applications may be developed and integrated without the need of extensive knowledge in robotics.
An advanced approach to the waypoint-based navigation for near-bottom survey of a cruising AUV is presented. Pursuing vehicle safety as well as high-definition bottom survey data, we apply GDS-based optimization techn...
详细信息
ISBN:
(纸本)9789897583803
An advanced approach to the waypoint-based navigation for near-bottom survey of a cruising AUV is presented. Pursuing vehicle safety as well as high-definition bottom survey data, we apply GDS-based optimization technique for achieving waypoint-based minimum-altitude flight of an underactuated cruising AUV. While the objective of our optimization is minimizing average altitude of a vehicle throughout its flight interval, depth or altitude references on waypoints are used as control inputs. In our optimization, bottom bathymetry is incorporated as a constraint used for bottom collision avoidance. As another constraint, dynamic model of an AUV is included. By solving the dynamic model in time domain, motion responses of the vehicle following reference waypoints are derived. Our approach of the optimal waypoint navigation is validated by not only simulation but also at-sea deployment of an AUV.
In order to keep its leadership in French rail market and to improve work conditions of its systems engineers during automation projects, the SNCF (French acronym for National Society of French Railways) wants to deve...
详细信息
ISBN:
(纸本)9789897583049
In order to keep its leadership in French rail market and to improve work conditions of its systems engineers during automation projects, the SNCF (French acronym for National Society of French Railways) wants to develop solutions increasing the productivity. One of these improvements focuses on the current methodology used by systems engineers to verify and validate PLC programs of electrical installations. this task remains one of the most important during an automation project because it is supposed to ensure installations safety, but it must be optimized. through an industrial thesis financed by SNCF, the aim of this research project is to improve this method and reduce time validation of programs by providing a tool which will help systems engineers to verify and validate quickly and automatically PLC programs during any automation project, not necessarily during factory tests but directly from their office.
this work is concerned withthe analysis of 3-d (3-dimensional) systems. the aim is to establish conditions that guarantee the asymptotic stability of these kinds of systems. To accomplish it, the Lagrange candidate s...
详细信息
ISBN:
(纸本)9789897580390
this work is concerned withthe analysis of 3-d (3-dimensional) systems. the aim is to establish conditions that guarantee the asymptotic stability of these kinds of systems. To accomplish it, the Lagrange candidate solutions method for partial difference equations is adopted here. We show that the systems are asymptotically stable if the entries of the matrices of their state space descriptions yield a solution in the Lagrange solution sense. Furthermore, the particular cases in which the matrices can be turned into a diagonal matrix by means of the canonical transformation is studied in order to figure out the role of the eigenvalues on the stability conditions.
暂无评论