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This paper studies modelling and dynamic analysis of underactuated capsule systems exhibiting friction-induced hysteresis. The motion mechanism is novel in utilizing internal centripetal torques generated by a vibration micro-motor mounted on the platform. Up to now, most investigations in frictional interactions towards capsule systems were confined into static or quasi-dynamic circumstance, where...
In this paper, we tested a dynamic control law on a 2DOF robot walking leg. To achieve this, we modeled the system using bond graphs, and the Sliding Control Method for real time control. To increase performance of the robot trajectory tracking control a fuzzy gain adjustment inside the dynamic control method have been used and the new results include the systems' influence on the sliding parameter...
The delta parallel mechanism has proven to be a very successful parallel robot design and a number of variants have been proposed in the literature. Taking advantage of its simple construction and the intrinsic features such as high stiffness and accuracy, delta robots play an important role both in the fields of industrial robots and academical fields. In this paper, dynamic modeling and control...
Survey of literature has revealed research on excavators in trajectory analysis, modeling, control, soil-tool interaction, energy efficiency, and simulators. Kinematics of excavators has largely remained unchanged over time. Dynamic models of 3 degree of freedom (DOF) manipulator have been applied in literature. Soil-tool interaction models are becoming computationally less demanding and more accurate,...
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 investigates human learning and skill performance to control an underactuated pendulum-driven capsule system within an interactive virtual simulation environment. A number of experiments is conducted with 9 participants who learned to control the capsule using a physical joystick. The results show differences in learning and skill performance among the participants. Right-handed and lefthanded...
The inverse dynamic of the leg with a (2-UPS+U)R series-parallel mechanism of the hybrid rescue robot is analyzed in this paper. First, the constrained relationships in the leg are determined, and the 6×6 Jacobian matrices of the series-parallel leg are derived and presented. Second, the velocity, acceleration, angular velocity and acceleration of center of mass in each link are solved and the dynamic...
In today's ever-changing market, global competition, technology development, customer demands, and decreases of product life cycles push logistics organizations in a supply chain (SC) to shift towards to flexible, robust, autonomy, responsive, and collaborative organization such as a virtual enterprise (VE). Internet and mobile technology support SMEs collaboration to establish VE with an inter-organizational...
This paper investigates several general friction models and applies different friction models to accurately simulate the propulsion of a capsule driven by an internally oscillating mass. The six published friction models are reviewed and are validated using the simulation studies. The simulation results are verified with a physical prototype in an experimentation test. The most accurate friction model...
In this paper, a real time virtual simulation framework which is the foundation for studying human adaptive mechatronics (HAM) is proposed. This framework allows researchers to interact and experiment with the system in real time. Thus, motion control patterns can be identified and learned with, for example, a heuristic strategy. The prototype is developed with an underactuated pendulum-driven capsule...
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...
A propulsion system that does not require any interaction with the external environment in the form of grasping or sticking is proposed. This internal propulsion system for a robot body operates by the use of the frictional force between the body and the environment, and the reaction force from the controlled acceleration of a mass. The dynamics and control issues of a rotating lever attached to a...
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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