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In this paper, a redundantly actuated chewing robot with two higher kinematic pairs (HKPs) is presented, which can be used in performance test and evaluation of denture material. The robot has six actuators, but only has four degrees of freedom, due to constraints of two HKPs which mimic two temporomandibular joints (TMJs) of human. Quasi-static force analysis in occlusion status is performed to calculate...
In recent years, a great many robot-assisted therapy systems have been developed and applied in neural rehabilitation. In this paper, we develop a wearable upper limb exoskeleton robot for the purpose of assisting the disable patients to execute effective rehabilitation. The proposed exoskeleton system consists of 7 degrees of freedom (DOFs) and is capable of providing naturalistic assistance of shoulder,...
An interesting about MAV and a research for flapping wing aero vehicle has been increased. It is required that take-off and landing abilities to lift up a vehicle by flapping motion to achieve a special purpose for flapping wing aero vehicle. An airfoil has to generate lift force more than a weight of the body to work take-off from the ground without additional force. MAV can generate enough lift...
This paper presents a novel nonlinear velocity estimation method for robotic joints based on inverse hyperbolic sine tracing differential algorithm. Unlike the conventional methods that using the motor-side position measurements to obtain the joint velocity, this paper addresses the problem of joint velocity estimation that using the link-side absolute encoder data, so that the kinematic error caused...
For the optimal robot-arm multi-point manufacturing sequence (RAMMS) problem, the best sequence needs to be explored to efficiently visit each task point just once and return back to the start one finally. It is the known travel salesman problem (TSP). Furthermore, in each task point, the optimal joint configuration is also a difficult problem because it involves an inverse kinematics (IK) computation...
Military vehicles are important part to maintain territories of a country. Military vehicle is often equipped with a gun turret mounted on top of the vehicle. Traditionally, gun turret is operated manually by an operator sitting on the vehicle. With the advance of current robotic technology an automatic operation of gun turret is highly possible. Notable works on automatic gun turret tend to use features...
In a robotized ultrasound scanning system and more generally in any system which interacts with a human, the used control laws have to satisfy a safety of operating and functioning. Moreover these control laws have to guarantee a high precision in the medical gesture tracking, and especially within the framework of the ultrasound scanning, they assure the preservation of the ultrasound plane. The...
This paper presents a novel modeling and fabrication technique of semi-soft mechanisms inspired by the origami twisted tower. The twisted tower is a modular origami structure consisting of multiple octagon-shaped layers. This structure can generate linear contraction, extension, and bending. A special geometric construct of this design allows each layer to fully collapse by twisting π/4°. Inspired...
Nowadays, when designing a bird-like flapping wing robot, single-section or two-foldable-section wing type is normally adopted to mimic the flexible wing, which is hard to simulate a real bird's flapping fly or gain well aerodynamic performance. In present work, a new flexible flapping wing vehicle, of which the flexibility of the wing is more authentic, is designed firstly, then the kinematic model...
Kinematic compatibility is of paramount importance in wearable robotic and exoskeleton design. Misalignments between exoskeletons and anatomical joints of the human body result in interaction forces which make wearing the exoskeleton uncomfortable and even dangerous for the human. In this paper we present a kinematically compatible design of an exoskeleton hip to reduce kinematic incompatibilities,...
This paper introduces a cable-driven robot for upper-limb rehabilitation. Kinematic and dynamic of this rehabilitation robot is analyzed. A sliding mode controller combined with a nonlinear disturbance observer is proposed to control this robot in the presence of disturbances. Simulation is carried out to prove the effectiveness of the proposed control scheme, and the results of the proposed controller...
Human-Robot Interaction is a prominent field of robotics today. Knowledge of human-human physical interaction can prove vital in creating dynamic physical interactions between human and robots. Most of the current work in studying this interaction has been from a haptic perspective. Through this paper, we present metrics that can be used to identify if a physical interaction occurred between two people...
This paper is focused on motion control of a nonholonomic car-like robot. The main idea of the proposed control method is based on an approximate decoupling of phase-constrained kinematics in order to imitate an omnidirectional robot. In order to facilitate the feedback design, the original kinematics is simplified and represented by a nilpotent homogeneous locally equivalent control system. Next,...
The article focuses on designed construction of the exoskeleton, which significantly reproduces the kinematic structure and the range of joint movement of the human upper limb. The exoskeleton will able to control real objects i.e. loading crane, including force feedback. The designed device, composed of seven rotary joints, is equipped with the closed loop Bowden cable conduit system with linear...
An algorithm for volumetric calibration is developed and verified practically by measuring of all geometric errors after numerical compensation. In this paper, analysis of the contribution of each of 9 translational and 9 rotational position dependent errors and each of 3 position independent errors in total displacement error vector is presented. Changing only one of the errors, and keeping all the...
Generating a proper simulation model out of a CAD tool for virtual commissioning is a challenging task. Several standard file formats and customized data structure are meant to represent every aspect of the simulation model, which are visualization, physics and kinematics. COLLADA is one of the promising 3D formats, which will be examined in this paper. However, it still lacks a convenient method...
In this study, we aim to explore ways to objectively assess cognitive deficits in the stroke and HIV/stroke populations, where cognitive and motor impairments can be hard to separate. Using an upper limb rehabilitation robot called the Haptic TheraDrive, we collect performance error scores and motor learning data on the impaired and unimpaired limb during a trajectory tracking task. We compare these...
In this paper, a cable-driven haptic interface able to move in the six-dimensional space, suitable for applications in various robotic scenarios is presented. The device takes advantage of four force-controlled twisted string actuators to generate a linear force along the three Cartesian space dimensions while providing a considerable force-weight ratio and low inertia. The system consists of a frame...
To investigate, improve, and observe the effect of rehabilitation therapy, many studies have been conducted on evaluating the motor function quantitatively by developing various types of robotic systems. Even though the robotic systems have been developed, functional evaluation of the hand has been rarely investigated, because it is difficult to install a number of actuators or sensors to the hand...
The main goal of this study is to analyse the effects of combined transcranial direct current stimulation (tDCS) and wrist robot-assisted therapy in subacute stroke patients. Twenty-four patients were included in this study and randomly assigned to the experimental (EG) or control group (CG). All participants performed wrist robot-assisted training a) in conjunction with tDCS (real stimulation for...
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