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Twisted String Actuation Systems


Twisted String Actuation Systems
  • Author : Gaponov Igor
  • Publisher : Butterworth-Heinemann
  • Release : 2019-11
  • ISBN : 0128141956
  • Language : En, Es, Fr & De
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Twisted String Actuation Systems: Applications, Modelling, and Control discusses the emerging area of twisted string actuation. It provides the basics of modeling and control, while also outlining the potential advantages of this actuation technique. Several detailed case studies describe the requirements and design parameters of the TSAs developed for different robotic applications. In addition, the book covers guidelines for engineers on the design and implementation of TSA in new areas and applications, discussing how to select strings with appropriate properties and suitable material, how to model actuators, and how to predict efficiency and lifetime. The book will benefit the engineering community and increase the popularity of this promising novel type of actuator as it brings together the most up-to-date technologies and advances in the TSA field, along with their background and history. Summarizes the state-of-the-art research in the area of twisted string actuators Provides the reader with the basics of modeling and control over actuators of this type, also outlining the potential advantages of this actuation technique Presents several case studies describing, in detail, the requirements and design parameters of the TSAs developed for various engineering applications, ranging from precise object positioning, to heavy-duty manipulation Includes MATLAB code files for modeling different aspects of the TSAs

The Effects of End Termination on the Endurance Life of Twisted String Actuators


The Effects of End Termination on the Endurance Life of Twisted String Actuators
  • Author : Bradley Scott Roan
  • Publisher :
  • Release : 2016
  • ISBN : OCLC:969774473
  • Language : En, Es, Fr & De
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Actuation is possibly the most fundamental aspect of any robotic system; a robot without any means to interact with the physical world is simply a computer. As such, new actuation methods are valuable additions to the field of robotics, and optimization of such methods can help advance the field as a whole. Twisted string actuators (TSA) are a relatively novel type of actuator, which convert the rotary motion of an electric motor to a tensile linear motion by twisting two or more strings around one another thereby shortening the length. When the twisting element is composed of high tensile strength fibers (such as high modulus polyethylene fiber), these actuators have the potential to possess many desirable characteristics of actuators, such as high force, high speed, high specific power (power to weight ratio), and high power density (power to volume ratio). Furthermore, because the transmission element is string, these actuators can be designed and built very cost efficiently. One of the major drawbacks of TSAs is their endurance life. While many engineering components operate in the millions of cycles, twisted string actuators operate in the range of tens of thousands of cycles. For some applications, this low endurance life is no issue, because the strings in the actuator are cheap and easily replaced. For many applications, however, this low of endurance life is unacceptable. The purpose of this thesis is to explore the effects of the end termination of the twisted element on the endurance life of the actuator. The basic architecture and concept of twisted string actuators is presented, as well as the mathematical description of their behavior. A hypothesis concerning the endurance life of the twisted element with respect to the end termination of the twisted element is presented and supported. A potential solution to the problem of low endurance life of twisted string actuators is presented and tested alongside two other common architectures. The results from this test are presented and discussed. When different architectures of twisted strings were tested and compared under identical conditions (i.e. style of string, material of string, resting length of twisting element, loading of the actuator, and actuation speed) it was found that the separator plate architecture outperformed both the pulley-to-pulley architecture, and the proposed architecture. The pulley-to-pulley tests resulted in a median endurance life of 36.5 cycles, the separator plate architecture resulted in a median endurance life of 364 cycles, and the proposed architecture resulted in a median endurance life of 115 cycles. During testing, the phenomenon of axial twist of individual strings, in addition to the twisting of the string pair driven by the motor, was observed, and identified as a potential explanation for the limited endurance life of the proposed architecture when compared with that of the separator plate architecture.

Proceedings of the 2020 USCToMM Symposium on Mechanical Systems and Robotics


Proceedings of the 2020 USCToMM Symposium on Mechanical Systems and Robotics
  • Author : Pierre Larochelle
  • Publisher : Springer Nature
  • Release : 2020-04-20
  • ISBN : 9783030439293
  • Language : En, Es, Fr & De
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This volume gathers the latest fundamental research contributions, innovations, and applications in the field of design and analysis of complex robotic mechanical systems, machines, and mechanisms, as presented by leading international researchers at the 1st USCToMM Symposium on Mechanical Systems and Robotics (USCToMM MSR 2020), held in Rapid City, South Dakota, USA on May 14-16, 2020. It covers highly diverse topics, including soft, wearable and origami robotic systems; applications to walking, flying, climbing, underground, swimming and space systems; human rehabilitation and performance augmentation; design and analysis of mechanisms and machines; human-robot collaborative systems; service robotics; mechanical systems and robotics education; and the commercialization of mechanical systems and robotics. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting and impactful research results that will inspire novel research directions and foster multidisciplinary research collaborations among researchers from around the globe.

Advanced Bimanual Manipulation


Advanced Bimanual Manipulation
  • Author : Bruno Siciliano
  • Publisher : Springer Science & Business Media
  • Release : 2012-04-12
  • ISBN : 9783642290404
  • Language : En, Es, Fr & De
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Dexterous and autonomous manipulation is a key technology for the personal and service robots of the future. Advances in Bimanual Manipulation edited by Bruno Siciliano provides the robotics community with the most noticeable results of the four-year European project DEXMART (DEXterous and autonomous dual-arm hand robotic manipulation with sMART sensory-motor skills: A bridge from natural to artificial cognition). The volume covers a host of highly important topics in the field, concerned with modelling and learning of human manipulation skills, algorithms for task planning, human-robot interaction, and grasping, as well as hardware design of dexterous anthropomorphic hands. The results described in this five-chapter collection are believed to pave the way towards the development of robotic systems endowed with dexterous and human-aware dual-arm/hand manipulation skills for objects, operating with a high degree of autonomy in unstructured real-world environments.

Human Friendly Robotics 2020


Human Friendly Robotics 2020
  • Author : Matteo Saveriano
  • Publisher : Springer Nature
  • Release :
  • ISBN : 9783030713560
  • Language : En, Es, Fr & De
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