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Serpentine Locomotion is the most common and simplest locomotion form of a snake-like robot; its main characteristic is the wave-like undulation of the snake's body. In order to realize the noticeable features of the snake-like robot's serpentine locomotion in water, we have developed an amphibious snake-like robot which can adapt to terrestrial and underwater environments. After we derived the dynamic...
AFM based nanomanipulation is still hindered by large spatial uncertainties encountered in tip positioning caused by PZT nonlinearity and thermal drift. In this paper, a landmark based positioning method is proposed to solve these problems. Its pivotal idea is that the tip position is described in a feature based landmark coordinate instead of length based Descartes coordinate. During manipulation,...
A new dynamical model of the shoulder has been developed. It consisted of eleven muscles. The glenohumeral joint is modeled as a spherical joint, allowing for three rotations. Muscle wrapping around a spherical humeral head is calculated analytically. The problem of indeterminated muscle forces is solved in two steps. First, an intermediate solution is calculated using the pseudo-inverse of the moment...
The humanoid bipedal robot WABIAN-2R was developed to be used as human motion simulator. It is able to perform similar human-like walking motion. Moreover, the robot is able to perform walking motions with a walking support device. This walking device was moving passively helping the robot to move easily. However, to go further with this development, we have to test the robot using the walking device...
This paper focuses on technical endeavors to develop bio-inspired dolphin-like robots, involving dynamic modeling, mechanical design, as well as motion control. The inspiration and motivation comes from the remarkable swimming abilities of dolphins together with some promising applications in aquatic environments. The thrust in dolphin-like movements in a robotics context can be generated by the up-down-motioned...
The bipedal humanoid robot WABIAN-2R is developed to simulate human locomotion. Performing a walking motion requires a high torque at the ankle joint. WABIAN-2R consists of harmonic gears in its driveline system which increases the weight of each leg and respectively decreases the energy economy. Therefore, a new idea is proposed and developed in this paper through computer simulation to modify the...
This paper firstly presents a method to formulate the dynamics of the mobile humanoid robot which is composed by the mobile platform and the upper body. As tip-over is an important stable issue for the mobile robot, the dynamic stability constraint is carefully studied to keep the robot stable. Stable support for the robot moving on a plane is solved. With the consideration of the stability problem...
In this paper modeling and robust sliding mode control of a snake-like robot in tracking of serpenoidal motion is addressed. By considering holonomic constraints, the kinematic and dynamic equations of a hyper redundant robot are obtained using Kane's method. The Coulomb friction between robot's wheels and the ground is modeled in two perpendicular directions (i.e. tangential and normal directions)...
A two degree-of-freedom motor system constructed with two sets of piezoelectric actuators mutually perpendicular around a spherical surface is designed. Each set is employed with a series of piezoelectric actuators driven by voltage with appropriate phase difference on the neighboring actuators so that traveling wave is generated. Such a system can be used for robot (eyes or joints), flight guide...
Passive-dynamic walkers are mechanical devices that walk down a slope without motors or controllers. In this paper we present in detail the incremental development of one such walker, the design stages we went through and its experimental results. We built a four-legged planar passive-dynamic walking machine with its inner and outer legs connected rigidly two by two, making it equivalent to a biped...
Recently, development of mini-sized humanoid robots with a certain level of intelligence becomes a popular research topic. Because of its small size and light weight, those humanoid robots become more portable and attractive. However, extra difficulties are introduced in hardware selection, mechanical design, motion planning, etc. In this paper, we propose the development of a transformable mini-humanoid...
The purpose of this study is to develop a methodology that enables a humanoid robot to imitate a whole body motion of a human. In the communication and interaction with a human being with motions and gestures, a humanoid robot needs not only to look like a human but to behave as a human does to make sure the meanings of motions and gestures. To act like a human, the humanoid robot has to imitate the...
Since a rigid humanoid robot arm is kinematically redundant and composed of seven degrees of freedom at least to execute complex and dexterous motions, how to construct a fast and precise control system becomes an important issue. To avoid high complexity of the high-order dynamic model considering coupling effects and payload variations typically inherited from common robotic systems, a robust dynamic...
Classical motion planners and most of navigation routines discard dynamics of the system and therefore fail in some special conditions. If a robot is moving towards an obstacle with a high acceleration and speed, collision is inevitable because the obstacles are taken into account only either once they are in range, or a physical collision is reported by detection routines. In this paper, we have...
This paper first presents a modeling method for a mobile humanoid robot whose upper human-like body is mounted on a mobile platform supported by three wheels (two driving wheels and one caster wheel). The upper body connects the platform by two-DOF joint and the wheeled platform moves on the ground subject to nonholonomic constraints. Then based on Lie groups and screw theory, the kinematics and dynamics...
This paper presents a bio-inspired concept for an autonomous centimeter-scale robot for locomotion on un-even terrains with bionic legs. Our previous work, the jumping robot ldquoGRILLO Irdquo, is firstly introduced, as well as its limitations. For improving the performance of this prototype, we made biological observations on jumping insects by means of a high speed camera. It was found that the...
This paper addresses a platform-based design for a bio-inspired amphibious robot well-suited for multi-mode motion both on ground and under water. It concerns mechanical design, hardware implementation, software design, as well as ADAMS-based modeling. By introducing well-established software and hardware architectures, an ARM+uC/OS-II centered embedded control system is formed. With the sensor subsystem...
A model of the human upper limb was developed for predicting the motion of the human upper limb while performing activities of daily living. This study focuses on the effect of a joint limit function on the ability of the model to perform human like movements. This measurement was analysed by comparing the modelled joint movements with recorded movements of subjects while drinking from a cup, opening...
Hierarchical structure of deterministic chaos in a chaotic neural network model (CNN) is investigated in the view of application in robotics. The result shows a rich capacity of CNN in selectively controlling the synchronization of neuron outputs, and sensitively responding to external sensory inputs, both being based on the intrinsic mechanism of the dynamics called chaotic itinerancy. Choosing appropriate...
In this paper, a software modelling and a layered framework for controlling multiple mobile robots in a leader-follower formation is proposed. The supervisor level in the framework handles the higher level missions such as formation and interobot communication, and the lower level deals with the dynamic control of robots while navigating the environment. Dynamic switching control strategy between...
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