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The improved full pneumatic climbing robot Sky Cleaner IV has recently been developed as an intelligent demonstrator and test bed for the implementation of nonlinear locomotion control. Pneumatic actuators control the robot's movement, reducing its weight and increasing its dexterity. The pneumatic system of the robot includes X, Y and Z cylinders, a waist cylinder, brush cylinders and vacuum suckers...
This paper describes a telescopic-arm type, climbing support robot. Although there are various kinds of wall climbing robots, there is a possibility that they may fall, due to the wall concavity/convexity or insufficient adhesion. To solve this problem, we developed the wall climbing support robot, which uses a telescopic-arm to support the climbing robot. The telescopic are includes a joint with...
This paper presents a vacuum-based wet adhesion system for wall climbing robots. This system allows an adherability and low friction performance when a suction cup adheres on rough surface such as concrete wall with small vacuum pump. It utilizes a seal action and lubrication action of a liquid to make the robot body adherable and slidable on the surface. The measurements of friction and seal performance...
We developed a rescue robot system, which allows efficient utilization of the potentials of a robot, by effectively switching between tele-operation mode and autonomous mode based on the task and the operation environment. Rescue robots are mobile sytems which can perform search for human lives, on behalf of rescue personnel, in dangerous environments like earthquack disaster zones or areas with chemical...
Many natural hazards like earthquake and seismic sea waves happen every year all over the world. In addition, many manmade disasters happen in many countries. To deal with these disasters, rescue robots are being developed in many countries. These robots support the rescue workers to search for the victims in the disaster environments. In this paper, we propose a flexible and generic interface system...
This paper proposes a modified split and merge algorithm for line extraction with high accuracy, efficient speed and low complexity. It is robust against measurement noises and demonstrates satisfactory results on different surfaces in determining line boundaries. The method is based on the least square equation to fit a line on a series of uncertain points. Different least square criterion is investigated...
In this paper, we propose a novel method using read-time of IC tags to reduce the localization error of an RFID navigation system. In order to reduce localization error, many approaches have been introduced. However, they do not deal with the problems that arise when the antenna can read at most one tag at any given moment. Using this, our passive RFID system is able to estimate the robot's location...
Cooperative multi-robot localization uses sensor measurements to estimate poses (locations, orientations) of robots in a given environment. Existing approach [3] updates a robot's belief of its pose instantly whenever it detects another robot. However, such instant update does not always contribute positively to the localization process, since both robots' pose estimates could be highly uncertain...
This paper tackles the problem of re-localization in a swarm of moving virtual robots where some robots might be lost and where the distance between each neighboring robot is known within a limited communication radius (e.g. using the strength of a radio/wifi signal), whereas the precise localization is not known. The basic process in relocalization relies in a robot swarm that re-aggregates based...
Modules have been widely used in development of various robots including re-configurable robots and snake-like robots. To build robotic systems more flexibly and quickly with low costs of manufacturing and maintenance, we have developed two basic types, which are called T-type and I-type, of robotic joint modules with one degree of freedom for general purpose. The modules are designed to be compact,...
The cluster space control technique promotes simplified specification and monitoring of the motion of mobile multi-robot systems of limited size. Previous work has established the conceptual foundation of this approach and has experimentally verified and validated its use for 2-robot, 3-robot and 4-robot systems, with varying implementations ranging from automated trajectory control to human-in-the-loop...
In this paper, an energetic swarm controller is developed that controls the swarm temperature, swarm centre position, and swarm potential energy. A sliding control approach is combined with a control allocation process to solve the overactuated control problem. The control allocation problem is solved using nonlinear programming software which allows the optimization problem to be solved with input...
This article presents robust control of the mobile inverted pendulum system(MIPS) whose structure is a combination of a wheeled mobile robot and an inverted pendulum with two arms. The MIPS navigates on the horizontal plane while balancing the pendulum. Control of the MIPS is difficult since the system is non-holonomic and nonlinear so that simple linear controllers may have poor performances for...
Design and development of unmanned aerial vehicles has attracted increased interest in the recent past. Rotorcraft UAVs, in particular have more challenges than its fixed wing counterparts. More research and experiments have been conducted to study the stability and control of RUAVs. A model-based control system design is particularly of our interest since it avoids a tedious trial and error process...
Bayesian reasoning is used in many robotics applications when there is significant uncertainty accompanying perception and action. Generally for Bayesian belief changes in query nodes, we are more interested in evidence that may lead to a change in decision. If an observation has very little effect on decisions, it could be regarded as an insignificant observation for the learning process. This paper...
We consider the problem of wheeled mobile robot navigation towards an unknown stationary or maneuvering target with real time obstacle avoidance using range-only measurements. We study a method for navigation and guidance termed equiangular navigation guidance (ENG) law and give mathematically rigorous proof of convergence and stability of the proposed navigation law. Using the sensory information,...
We consider the problem of navigation of wheeled mobile robot (WMR) towards an unknown target in a cluttered environment. The biologically inspired navigation algorithm is the equiangular navigation guidance (ENG) combined with a local obstacle avoidance technique. The collision avoidance technique uses a system of active sensors which provides the necessary information about the obstacles in the...
In many fields employing robots, e.g., wheelchair robots, rescue robots, and construction robots, robots that can move on rough terrains are desired. A robot with a simple mechanism and high mobility for all terrains is discussed in this paper. A four-wheel-type mobile robot is developed, and its design is discussed from a functional viewpoint. Its fundamental capability of moving on rough terrains...
Theoretical analysis and implementation of autonomous staircase detection and stair climbing algorithms on a novel rescue mobile robot are presented in this paper. The main goals are to find the staircase during navigation and to implement a fast, safe and smooth autonomous stair climbing algorithm. Silver is used here as the experimental platform. This tracked mobile robot is a tele-operative rescue...
Plasma-RX is a team of robots for search and rescue mission in an urban environment. The robot configuration contains differential drive tracks with front/rear flippers and serial-link arms equipped with cameras. They contain many sensors: thermopile array, CO2 sensor, microphone, tilt sensor, digital compass and laser range finder. For low level control of robots, a processor Arm7 and a special-purpose...
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