Temat: avoidance - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Real-time coordinated trajectory planning and obstacle avoidance for mobile robots
Autorzy:: McNinch, L. C.
Soltan, R. A.
Muske, K. R.
Ashrafiuon, H.
Peyton, J. C.
Tematy:: path planning
obstacle avoidance
ODE
mobile robots; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384978.pdf Link otwiera się w nowym oknie
Opis:: A novel method for real-time coordinated trajectory planning and obstacle avoidance of autonomous mobile robot systems is presented. The desired autonomous system trajectories are generated from a set of first order ODEs. The solution to this system of ODEs converges to either a desired target position or a closed orbit de.ned by a limit cycle. Coordinated control is achieved by utilizing the nature of limit cycles where independent, non-crossing paths are automatically generated from different initial positions that smoothly converge to the desired closed orbits. Real-time obstacle avoidance is achieved by specifying a transitional elliptically shaped closed orbit around the nearest obstacle blocking the path. This orbit determines an alternate trajectory that avoids the obstacle. When the obstacle no longer blocks a direct path to the original target trajectory, a transitional trajectory that returns to the original path is defined. The coordination and obstacle avoidance methods are demonstrated experimentally using differential-drive wheeled mobile robots.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Fuzzy logic controller with fuzzylab python library and the robot operating system for autonomous mobile robot navigation
Autorzy:: Avelar, Eduardo
Castillo, Oscar
Soria, José
Tematy:: fuzzy controller
mobile robot navigation
obstacle avoidance; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/385156.pdf Link otwiera się w nowym oknie
Opis:: The navigation system of a robot requires sensors to perceive its environment to get a representation. Based on this perception and the state of the robot, it needs to take an action to make a desired behavior in the environment. The actions are defined by a system that processes the obtained information. This system can be based on decision rules defined by an expert or obtained by a training or optimization process. Fuzzy logic controllers are based on fuzzy logic on which degrees of truth are used on sy‐ stem variables and has a rule‐base that stores the knowledge about the operation of the system. In this paper a fuzzy logic controller is made with the Python fuzzylab library which is based on the Octave Fuzzy Logic Toolkit, and with the Robot Operating System (ROS) for autonomous navigation of the TurtleBot3 robot on a simulated and a real environment using a LIDAR sensor to get the distance of the objects around the robot.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Motion planning for wheeled mobile robot using potential field method
Planowanie ruchu mobilnego robota kołowego z zastosowaniem sztucznego pola potencjalnego
Autorzy:: Żylski, W.
Tematy:: mobile robots
obstacle avoidance
artificial potential field; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281931.pdf Link otwiera się w nowym oknie
Opis:: A potential field method in the real-time approach toward avoidance of obstacles for a mobile robot has been developed. A collision-free path and goal-seeking behaviour are calculated using an artificial potential field method. The proposed reactive nevigation approach is based on the coordination of elementary responses. To avoid convex obstacles, the navigator generates a "reaching the middle of the collision-free space" and goal-seeking behaviours. A control strategy based on artificial potential fields that generates a trajectory to be followed by a mobile robot that represents a reference for the robot at the same time is proposed. The effectiveness of the proposed method is numerically verified by a series of experiments on the emulator of the wheeled mobile robot Pioneer-2DX.
W pracy rozważa się problem generowania bezkolizyjnej trajektorii ruchu mobilnego robota w czasie rzeczywistym z zastosowaniem sztucznego pola potencjalnego. Analizuje się elementarne zachowanie mobilnego robota, takie jak: osiągnij środek wolnej przestrzeni oraz idź do celu. Wygenerowana trajektoria ruchu umożliwiająca omijanie przeszkód wypukłych uwzględnia elementarne zachowania robota. Stanowi ona trajektorię zadaną, która realizuje układ sterowania. Efektywność zaproponowanego rozwiązania została numerycznie zweryfikowana na emulatorze mibilnego robota kołowego Pioneer-2DX.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Spatial motion of the aircraft manoeuvring to avoid moving obstacle
Autorzy:: Graffstein, J.
Tematy:: anti-collision manoeuvre
obstacle avoidance
flight simulation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279527.pdf Link otwiera się w nowym oknie
Opis:: In the paper, mathematical relationships which are used to describe kinematic variables of the aircraft-obstacles configuration and motion of the aircraft are presented. These define the base for the set of conditions enabling determination of the possibility and threat of collision. The second important aim of such a definition is creation of prerequisites for selection of an appropriate anti-collision manoeuvre, computation of reference signals and inequalities used as limitations on these signals in the automatic flight control process. Theoretical analysis is illustrated by an example of computer simulation of the flight of aircraft. Two anti- -collision manoeuvres are studied in this experiment. The first one, performed in a vertical plane, consists in emergency climbing. The second one, performed in the horizontal plane, is shaped by three turns, each one of small radius, to go around the obstacle and then return to the previously realised flight path.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Real-time obstacle avoidance using harmonic potential functions
Autorzy:: Szulczyński, P.
Pazderski, D.
Kozłowski, K.
Tematy:: motion planning
obstacle avoidance
mobile robot
harmonic function; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384802.pdf Link otwiera się w nowym oknie
Opis:: The paper presents a solution of motion planning and control of mobile robot in a two-dimensional environment with elliptical static obstacle based on hydrodynamics description. Theoretical background refers to solution of Laplace equation using complex algebra. The method of designing complex potential with respect to stationary elliptical obstacle and stationary goal is formally shown. Next, the planning motion problem is extended assuming that the goal is moving. Then results of motion planning is used in order to design closed-loop control algorithms which is based on decoupling technique. Theoretical considerations are supported by numerical simulations illustrating example results of motion planning and control.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Efficient non-odometry method for environment mapping and localisation of mobile robots
Autorzy:: Adamowicz, Mateusz
Ambroziak, Leszek
Kondratiuk, Mirosław
Tematy:: mobile robot
mapping
navigation
obstacle detection
obstacle avoidance; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/1837947.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the simple algorithm of simultaneous localisation and mapping (SLAM) without odometry information. The proposed algorithm is based only on scanning laser range finder. The theoretical foundations of the proposed method are presented. The most important element of the work is the experimental research. The research underlying the paper encompasses several tests, which were carried out to build the environment map to be navigated by the mobile robot in conjunction with the trajectory planning algorithm and obstacle avoidance.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Neural Based Autonomous Navigation of Wheeled Mobile Robots
Autorzy:: Al-Sagban, M.
Dhaouadi, R.
Tematy:: reactive navigation
obstacle avoidance
autonomous ground robots
recurrent neural networks; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384293.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a novel reactive navigation algorithm for wheeled mobile robots under non-holonomic constraints and in unknown environments. Two techniques are proposed: a geometrical based technique and a neural network based technique. The mobile robot travels to a pre-defined goal position safely and efficiently without any prior map of the environment by modulating its steering angle and turning radius. The dimensions and shape of the robot are incorporated to determine the set of all possible collision-free steering angles. The algorithm then selects the best steering angle candidate. In the geometrical navigation technique, a safe turning radius is computed based on an equation derived from the geometry of the problem. On the other hand, the neural-based technique aims to generate an optimized trajectory by using a user-defined objective function which minimizes the traveled distance to the goal position while avoiding obstacles. The experimental results demonstrate that the algorithms are capable of driving the robot safely across a variety of indoor environments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Energy-efficient walking over irregular terrain: a case of hexapod robot
Autorzy:: Luneckas, Mindaugas
Luneckas, Tomas
Udris, Dainius
Plonis, Darius
Maskeliunas, Rytis
Damasevicius, Robertas
Tematy:: hexapod walking robot
irregular terrain
obstacle avoidance
energy consumption
leg trajectory optimization; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220953.pdf Link otwiera się w nowym oknie
Opis:: Adaptive locomotion over difficult or irregular terrain is considered as a superiority feature of walking robots over wheeled or tracked machines. However, safe foot positioning, body posture and stability, correct leg trajectory, and efficient path planning are a necessity for legged robots to overcome a variety of possible terrains and obstacles. Without these properties, any walking machine becomes useless. Energy consumption is one of the major problems for robots with a large number of Degrees of Freedom (DoF). When considering a path plan or movement parameters such as speed, step length or step height, it is important to choose the most suitable variables to sustain long battery life and to reach the objective or complete the task successfully. We change the settings of a hexapod robot leg trajectory for overcoming small terrain irregularities by optimizing consumed energy and leg trajectory during each leg transfer. The trajectory settings are implemented as a part of hexapod robot simulation model and tested through series of experiments with various terrains of differing complexity and obstacles of various sizes. Our results show that the proposed energy-efficient trajectory transformation is an effective method for minimizing energy consumption and improving overall performance of a walking robot.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Navigation of autonomous mobile robot using different activation functions of wavelet neural network
Autorzy:: Panigrahi, P. K.
Ghosh, S.
Parhi, D. R.
Tematy:: autonomous mobile robot
activation functions
obstacle avoidance
path planning
wavelet neural network; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/229613.pdf Link otwiera się w nowym oknie
Opis:: An autonomous mobile robot is a robot which can move and act autonomously without the help of human assistance. Navigation problem of mobile robot in unknown environment is an interesting research area. This is a problem of deducing a path for the robot from its initial position to a given goal position without collision with the obstacles. Different methods such as fuzzy logic, neural networks etc. are used to find collision free path for mobile robot. This paper examines behavior of path planning of mobile robot using three activation functions of wavelet neural network i.e. Mexican Hat, Gaussian and Morlet wavelet functions by MATLAB. The simulation result shows that WNN has faster learning speed with respect to traditional artificial neural network.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A learning paradigm for motion control of mobile manipulators
Autorzy:: Abdessemed, F.
Monacelli, E.
Benmahammed, K.
Tematy:: manipulator ruchomy
sieć neuronowa
unikanie przeszkód
mobile manipulator
neural network
backpropagation
obstacle avoidance; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/908373.pdf Link otwiera się w nowym oknie
Opis:: Motion control of a mobile manipulator is discussed. The objective is to allow the end-effector to track a given trajectory in a fixed world frame. The motion of the platform and that of the manipulator are coordinated by a neural network which is a kind of graph designed from the kinematic model of the system. A learning paradigm is used to produce the required reference variables for each of the mobile platform and the robot manipulator for an overall coordinate behavior. Simulation results are presented to show the effectiveness of the proposed scheme.
Dostawca treści:: Biblioteka Nauki

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