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2013 1st RSI/ISM International Conference on robotics and Mechatronics, ICRoM 2013

作者： Dehghani, Mohammad Moosavian, S. Ali A. Center of Excellence in Robotics and Control Dept. of Mechanical Eng. K. N. Toosi Univ. of Tech. Tehran Iran

ISBN: (纸本)9781467358118

In contrast to traditional articulated robots, continuum robots do not have any joints. The backbone of these robots can be bent, twisted and stretched by environmental and actuation forces. A group of continuum robotic arms use tendon-driven actuation systems. In this group, the shape of robot backbone can be controlled by pulling the tendons. Generally, exact modeling of the forces and moments produced by tendon-driven systems has no closed form solution. However, for a simplified case where the backbone shape is a planar curve with a constant curvature, some closed-form solutions have been introduced. Such solutions are valuable, especially in control applications where Jacobian matrices must be calculated. For exact modeling of elastic rods in spatial deformations, constant curvature models are not accurate. In such cases, the theory of Cosserat rod can be used for backbone modeling. Continuum robots usually consist of an elastic rod as the backbone and an actuation system. The effects of the actuation systems must be included to the model of Cosserat rod. The effects of the actuation systems are more complicated, when the tendon passages are not parallel to the backbone. In this paper, a model for continuum robotic arms is presented, which considers both, the elastic backbone and the effects of the actuation system. Furthermore, the tendons can twist around the backbone, in an arbitrary passage. The presented model is more compact than other solutions, and will be validated in a case study, by comparison with numerical results obtained from existing models. © 2013 IEEE.

关键词： Tendons

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Characteristics identification of continuum robots for exact modeling

Characteristics identification of continuum robots for exact...

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2013 1st RSI/ISM International Conference on robotics and Mechatronics, ICRoM 2013

作者： Dehghani, Mohammad Moosavian, S. Ali A. Center of Excellence in Robotics and Control Dept. of Mechanical Eng. K. N. Toosi Univ. of Tech. Tehran Iran

ISBN: (纸本)9781467358118

Continuum robots do not have any joint in contrast to traditional articulated robots. Instead, these robots can bend, twist and stretch their backbone, to shape desired configurations and end-effector position. Therefore, exact modeling of these robots is a challenging problem, particularly in spatial deformations. This paper suggests identification of some mechanical characteristics of the backbone of continuum robots, to achieve accurate results. The importance of identification of characteristics, such as undeformed shape and modulus of elasticity, will be discussed. Then, some methods to identify these characteristics are presented. Theory of Cosserat Rod will be introduced and used for modeling continuum robotic arms in this paper. Finally, the proposed approach is used for a given robot, and the model obtained based on the identified parameters will be validated by experimental results. © 2013 IEEE.

关键词： End effectors

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A new approach in gait planning for humanoid robots

A new approach in gait planning for humanoid robots

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2013 1st RSI/ISM International Conference on robotics and Mechatronics, ICRoM 2013

作者： Khadiv, Majid Moosavian, S. Ali A. Center of Excellence in Robotics and Control Department of Mechanical Engineering K. N. Toosi Univ. of Technology PO Box 19395-1999 Tehran Iran

ISBN: (纸本)9781467358118

Due to redundancy and natural instability of humanoid robots, their motion planning becomes a challenging task. Designing stable gaits with smooth trajectories for a humanoid robot is the main goal of this article. Taking all related parameters on robot's walking into consideration, a new gait planning approach in the task space is developed. Various aspects like upper-body motion and stability requirements have the most significant role in this new gait planning process. In order to reduce undesired fluctuations on robot center of mass a new method in trajectory planning is also suggested. To show performance of the proposed algorithm, it is compared with another reliable approach in this field, and the results will be discussed. © 2013 IEEE.

关键词： Inverse kinematics

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Dynamics modelling and stable motion control of a Ballbot equipped with a manipulator

Dynamics modelling and stable motion control of a Ballbot eq...

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2013 1st RSI/ISM International Conference on robotics and Mechatronics, ICRoM 2013

作者： Asgari, Pouya Zarafshan, Payam Moosavian, S. Ali A. Center of Excellence in Robotics and Control Department of Mechanical Engineering K. N. Toosi Univ. of Technology PO Box 19395-1999 Tehran Iran

ISBN: (纸本)9781467358118

Human-Robot physical interaction is an important attribute for robots operating in human environments. A Ballbot is an under-actuated system with nonholonomic dynamic constraints. It is a skinny robot with a small base that helps the robot to move in limited space. It is as tall as human height until could interact by people whereas a Ballbot has not been equipped with a manipulator. This manipulator adds new advantages to the Ballbot such as object manipulation and grasping. In this paper and to achieve more performance of a Ballbot, it is equipped with a PUMA type manipulator which gives to the proposed robot the capability of better stabilization. To this end, dynamics equations of the assumed mobile robot is presented and verified. Then, by respecting to this fact that a Ballbot is in the class of under-actuated systems, a control algorithm is proposed to attain the stable motion control of the system. Finally, a simulation routine is performed to move along the desired path/trajectory. Obtained results reveal the merits of the verified model of the new Ballbot and the considered control algorithm which will be discussed. © 2013 IEEE.

关键词： Manipulators

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ESICM LIVES 2016: part one Milan, Italy. 1-5 October 2016 Abstracts

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INTENSIVE CARE MEDICINE EXPERIMENTAL 2016年第SUPPL 1期4卷 1-1页

作者： [Anonymous] Academic Medical Center University of Amsterdam Amsterdam Netherlands UMCU Utrecht Netherlands Autonomous University of Barcelona Barcelona Spain Hospital São Francisco Xavier Lisbon Portugal CHU Henri Mondor Medical ICU Créteil France Université de Paris Est-Créteil Groupe de Recherche Clinique CARMAS Créteil France Hôpital Tenon APHP Medical and Surgical ICU Paris France Université Paris Diderot Sorbonne Paris Cité UMR 1153 Paris France Interdepartmental Division of Critical Care University of Toronto Toronto Canada University Health Network University of Toronto Critical Care Medicine Toronto Canada University of Milan - Bicocca Health Sciences School of Medicine and Surgery Monza Italy St Michael’s Hospital University of Toronto Anesthesia Toronto Canada CHU d’Angers Medical ICU Angers France Interdepartmental Division of Critical Care University of Toronto Saint Michael’s Hospital and Keenan Research Centre Toronto Canada University of Birmingham Institute for Inflammation and Ageing Birmingham UK University of Sheffield Mathematics and Statistics Help Centre Sheffield UK Heart of England NHS Foundation Trust Intensive Care Medicine Birmingham UK Department of Surgery University Hospitals Birmingham NHS Trust Birmingham UK University Hospitals Birmingham NHS Trust Anaesthesia and Critical Care Medicine Birmingham UK Queen’s University of Belfast Wellcome-Wolfson Institute for Experimental Medicine Belfast UK Royal Victoria Hospital Intensive Care Medicine Belfast UK University of Warwick Warwick Clinical Trials Unit Coventry UK University of Bari ‘Aldo Moro’ Bari Italy Hospital Israelita Albert Einstein São Paulo Brazil Mayo Clinic Jacksonville USA Mahidol University Faculty of Tropical Medicine Bangkok Thailand University Medical Center Utrecht Intensive Care Utrecht Netherlands University Medical Center Utrecht Julius Center for Health Sciences and Primary Care Utrecht Netherlands Academic Medical Center University of Amste

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Characteristics identification of continuum robots for exact modeling

Characteristics identification of continuum robots for exact...

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RSI/ISM International Conference on robotics and Mechatronics (ICROM)

作者： Mohammad Dehghani S. Ali A. Moosavian Center of Excellence in Robotics and Control Advanced Robotics and Automated Systems Laboratory Department of Mechanical Engineering K. N. Toosi University of Technology Tehran Iran

关键词： Robots Temperature measurement Elasticity

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A new approach for orientation determination

A new approach for orientation determination

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RSI/ISM International Conference on robotics and Mechatronics (ICROM)

In some modeling and control problems, especially in robotics, determination of orientation of a rotating body or frame requires slow and time taking numerical calculations. In some cases, such as for continuum robots, these time-taking calculations are an impediment to real-time control. The common approaches for orientation determination, such as Euler angles or Euler parameters, are beneficial when generalized coordinates are needed. Otherwise, these approaches require some time-taking equations for calculation of the rotation matrix (direction cosine matrix). Another method is to calculate the rotation matrix directly, based on the angular velocity. Although this method is very fast, it is numerically unstable, because of accumulation of some numerical errors. In this paper, an approach is introduced that cancels these errors with the least numerical efforts, and provides high accuracies. The application and importance of this approach is studied and discussed in the case of modeling and control of continuum robotic arms, as an instance. The proposed methods are used to model a spring, as a case study. The obtained results are validated by analytic data, and are compared to the results obtained by other methods.

关键词： Vectors

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State prediction approach for master-slave agents in presence of communication delay

State prediction approach for master-slave agents in presenc...

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2013 1st RSI/ISM International Conference on robotics and Mechatronics, ICRoM 2013

作者： Ghahremani, Sona Nili Ahmadabadi, Majid Mirian, Maryam S. Araabi, Babak N. Cognitive Robotics Lab. Dept. of Elect. and Comp. Eng. University of Tehran Iran Control and Intelligent Processing Center of Excellence Dept. of Elect. and Comp. Eng. University of Tehran Iran Robotics and Machine Intelligence Dept. of Elect. and Comp. Eng. University of Tehran Iran

ISBN: (纸本)9781467358118

Teleoperation is a mechanism that makes it possible to accomplish a task in an environment where the presence of the master at the slave site is either undesirable or hardly possible The communication delay is a challenge with undesirable effects, jeopardizing the teleoperated systems the most. When the salve agent is performing in a dynamically changing environment, communication delay can be very harmful since the environment is changing continuously even though the agent has stopped operating because of the delay. Many studies have been conducted to overcome time delay effects. © 2013 IEEE.

关键词： Remote control

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Modeling of continuum robots with twisted tendon actuation systems

Modeling of continuum robots with twisted tendon actuation s...

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RSI/ISM International Conference on robotics and Mechatronics (ICROM)

关键词： Robots Vectors

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Comparing effects of rigid, flexible, and actuated series-elastic spines on bounding gait of quadruped robots

Comparing effects of rigid, flexible, and actuated series-el...

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RSI/ISM International Conference on robotics and Mechatronics (ICROM)

作者： Mohammad Hasan H. Kani Majid Nili Ahmadabadi Control and Intelligent Processing Center of Excellence Cognitive Robotics Laboratory School of ECE College of Engineering University of Tehran Tehran Iran

Spinal actuation is necessary for quadruped robots to achieve rapid leg locomotion. In this paper, effect of flexible spinal actuation on the bounding gait is investigated. By defining a performance criterion for the bounding gait, a quadruped robot (Ghostdog) is tested in four different case studies; namely rigid spine, flexible passive spine, actuated spine, and series elastic actuated spine. We show that the robot with a series elastic actuator in its spinal joint has the best performance criterion and is the best robot in terms of bounding power consumption. On the other hand, it is shown that by using spinal actuation not only the speed of locomotion increases considerably, but also the pattern of bounding becomes more similar to real fast felines.

关键词： Robots Oscillators Equations Hip

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