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Legged robots have greater capability to traverse irregular terrains. However, one of the most common problems is the failure of the actuators when the robot is working in remote. Fault-tolerant gait about one fault actuator can be found. This paper proposes another algorithm for more than one fault actuators. The degree-of-freedoms (DOFs) of the robot body are divided into two parts: the major DOFs,...
This paper proposes a 6-DOF (Degree of Freedom) heavy-load parallel manipulator with a redundant actuation and fault-tolerant actuator (RFTA). The novel RFTA model of the proposed manipulator is developed and its working principle is described. In order to achieve the given motion, the mathematic models of the proposed manipulator with the RFTA are derived. As a prototype of an earthquake simulator,...
This paper reviews several key issues on the trends and open research problems of parallel manipulators. The research of a parallel manipulator structure is an essential question. It includes two research issues: design of a novel parallel robot mechanism and performance indexes. This paper reviews the methods on the two aspects and presents the research directions. The paper discusses the functions...
In this paper a novel orthogonal 6-DOF (Degree Of Freedom) parallel robot with redundant actuation is studied as an earthquake motion simulator. Taking the practical simulation of earthquake waves into consideration, we firstly analyze the general characteristics of natural earthquakes. Complexity and variety of seismic waves, 3-dimension and multi-DOF movement and strong devastating force are regarded...
In this paper, a model predictive controller for time delay capsubot system is presented. Linearized dynamics is used to predictive future system behavior and a control law is derived from a quadratic cost function penalizing the system tracking error and the control effort. It is noted that model predictive control has advantages over state feedback law because of consideration of constraints on...
This paper presents a new method of applying laser sensor to obtain road boundary points in order to solve the road detection problems of outdoor cleaning mobile robot. This method makes full use of the advantages of laser sensor and realizes the recognition of road detection in real-time. The road boundary recognition algorithm including the feature extraction and coordinate calculation is proposed...
Capsule robots have attracted great attention from researchers due to their potential applications in medicine. In this paper, the capsule robot system is studied from the control point of view, i.e. an underactuated system which has two degrees of freedom but only one control actuator. An exponentially stable robust nonlinear control scheme based on Lyapunov stability theory is studied on the capsule...
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