1,721,006 research outputs found
HANDSHAKE: HANDling System for Human Autonomous KEeping
No full textThis paper presents a novel biped-wheeled-wearable machine, named HANDSHAKE, and obtained by an evolution of two robots presented in other works: one °exible-wheeled leg and one biped-°exible-wheeled robot. A critical design analysis of these two robots helped the author to propose a novel machine able to revolutionize the lower body exoskeletons' world. Conceptual and functional design, mechanical behavior (kinematics and dynamics), and multibody simulation of the biped-wheeled exoskeleton are presented in this paper, and a ̄rst reduced scale prototype is used to show the feasibility of the proposed solution. The simple control architecture used in this work underlines the enormous advantages to use the HANDSHAKE system for people with a complete absence of mobility, which are completely supported by this machine. This is possible thanks to the wheeled feet of the HANDSHAKE system which allow to support more weights respect to the classical exoskeletons, available on market and literature. The proposed machine increases stability, dynamic balance, autonomy, reducing power supply and complexity in comparison with classical exoskeleton systems because the wheeled feet are always in contact with the ground. These advantages, recognized in humanoid robots, may be used also in exoskeletons
A New Cable-Driven Model for Under-Actuated Force–Torque Sensitive Mechanisms
No full textForce–torque sensors are used in many and different domains (i.e., space, medicine, biology, etc.). Design solutions of force–torque sensors can be conceived by using many types of connections or components; however, there are only a few sensors designed using cable-driven systems. This could be related to many reasons, one of which being that cables are able only to pull and not push. In this paper, a new cable-driven model for under-actuated force–torque sensing mechanisms is proposed, simulated, and tested, underlining the novelty of using cables for force–torque sensing. Analytical formulations, simulations, and physical implementations are presented in this paper. Results confirm that the new proposed model can be used for force–torque sensing mechanisms in micro- and macro- applications where under-actuation is a fundamental requirement, as in robotic surgery. The proposed model and mechanism can be used in the design of sensors and actuators. The innovative model is validated with two different test benches, opening new challenges in the design and development of under-actuated force–torque transducers
Cable-Driven Mechanism Models for Sensitive and Actuated Minimally Invasive Robotic Instruments
No full textCable-driven mechanism models are, usually, included in actuated systems; however, recently, their use for sensitive systems has been explored. In this paper, two cable-driven multi-body mechanism models are compared, underlining advantages and constraints in using sensitive cable-driven mechanisms for minimally invasive robotic instruments. The proposed approach could be useful in bypassing sterilization problems for surgical robotic instruments because our system allows for the separation of the robotic sterilizable part from the sensitive-actuated part of the surgical instrument. The real implementation of the proposed mechanism models, presented partially in other works, are validated in this paper, performing a simulation using a multi-body environment. Results confirm the feasibility of the proposed sensitive-actuated approach, defining new bases for the next challenges of the future
Force–Torque Sensors for Minimally Invasive Surgery Robotic Tools: An Overview
No full textIn this survey, we analyse some of the main design solutions of force-torque sensors for surgical instruments with a critical approach, including design and application constraints: robotic surgery environment, surgeon perception, general design architectures of force-torque sensors and force-torque sensors used in robot-assisted minimally invasive surgery
A Planar Cable-Driven Under-Sensing Model to Measure Forces and Displacements
No full textIn this paper, a new simplified model with respect to our published work is presented, reducing the number of cables and including the calculation of friction in the developed test bench. The formulation to calculate the displacement of the point of the applied force and the formulation to calculate the force are presented and validated with a simulation and by using a real test bench for experimentation. A multi-body system is used for the simulation, and the results are compared and discussed
Correction to: Comfort Perception Analysis of Human Models Interfacing with Novel Biped-Wheeled-Exoskeletons
No full textA Planar Cable-Driven Under-Sensing Model to Measure Forces and Displacements
No full textThis paper presents a planar cable-driven model of a simple mechanism that is able to measure forces and displacements. Recently, a preliminary study based on a cable-driven sensitive mechanism was presented to the research community, underlining the innovative characteristics of the model in under-actuation and under-sensing. The core of the research work was to conceive a compliant system able to measure forces and displacements from a point located in a different zone with respect to the one where the force is applied, and this is possible thanks to cable-driven systems. In this paper, a new simplified model with respect to our published work is presented, reducing the number of cables and including the calculation of friction in the developed test bench. The formulation to calculate the displacement of the point of the applied force and the formulation to calculate the force are presented and validated with a simulation and by using a real test bench for experimentation. A multi-body system is used for the simulation, and the results are compared and discussed. Four cases are analysed to test the formulation, including the friction in pulleys and in the joint connection between the mobile part and the fixed part of the mechanism. Future works will be oriented toward reducing the dimensions of the conceived mechanism in order to implement the model in minimally invasive robotic surgery instruments
Comfort Perception Analysis of Human Models Interfacing with Novel Biped-Wheeled-Exoskeletons
No full textThis paper presents a comfort perception analysis of human models interfacing with a novel biped-wheeled-exoskeleton. Usually, many attentions are given to the exoskeleton machine design but, in many cases, without considering the human comfort point of view. This paper merges the conceptual design of the novel biped-wheeled-exoskeleton machine, here proposed in a first time, with the analysis of the comfort perception of human models. The simulation of the human muscular activation is performed using the OpenSim software and the comfort analyses are done thanks to the literature review. Results underline how the comfort perception analysis of a human model with the same constraints of a wearable machine, may optimize the design process of a comfortable wearable hardware by the user. Novel comfortable joints range of motions of a human model, wearing biped-wheeled-exoskeletons, are also the results of this research wor
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