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Chapter 20 — Snake-Like and Continuum Robots

Ian D. Walker, Howie Choset and Gregory S. Chirikjian

This chapter provides an overview of the state of the art of snake-like (backbones comprised of many small links) and continuum (continuous backbone) robots. The history of each of these classes of robot is reviewed, focusing on key hardware developments. A review of the existing theory and algorithms for kinematics for both types of robot is presented, followed by a summary ofmodeling of locomotion for snake-like and continuum mechanisms.

Two-dimensional binary manipulator

Author  Greg Chirikjian

Video ID : 160

Greg Chirikjian's binary manipulator operating in two dimensions.

Chapter 21 — Actuators for Soft Robotics

Alin Albu-Schäffer and Antonio Bicchi

Although we do not know as yet how robots of the future will look like exactly, most of us are sure that they will not resemble the heavy, bulky, rigid machines dangerously moving around in old fashioned industrial automation. There is a growing consensus, in the research community as well as in expectations from the public, that robots of the next generation will be physically compliant and adaptable machines, closely interacting with humans and moving safely, smoothly and efficiently - in other terms, robots will be soft.

This chapter discusses the design, modeling and control of actuators for the new generation of soft robots, which can replace conventional actuators in applications where rigidity is not the first and foremost concern in performance. The chapter focuses on the technology, modeling, and control of lumped parameters of soft robotics, that is, systems of discrete, interconnected, and compliant elements. Distributed parameters, snakelike and continuum soft robotics, are presented in Chap. 20, while Chap. 23 discusses in detail the biomimetic motivations that are often behind soft robotics.

Active damping control on the DLR Hand Arm System

Author  Florian Petit, Alin Albu-Schäffer

Video ID : 548

The effectivness of active damping control is shown in a writing task performed by the DLR Hand Arm System.

Chapter 20 — Snake-Like and Continuum Robots

Ian D. Walker, Howie Choset and Gregory S. Chirikjian

This chapter provides an overview of the state of the art of snake-like (backbones comprised of many small links) and continuum (continuous backbone) robots. The history of each of these classes of robot is reviewed, focusing on key hardware developments. A review of the existing theory and algorithms for kinematics for both types of robot is presented, followed by a summary ofmodeling of locomotion for snake-like and continuum mechanisms.

RDP experimental results

Author  Nabil Simaan

Video ID : 247

Demonstrates a prototype system for transurethral bladder cancer resection. This robot has a 5 mm snake with two segments and three working channels including a custom-made fiberscope, laser ablation and a gripper [1-3]. References: [1] A. Bajo, R. B. Pickens, S. D. Herrell, N. Simaan: A pilot ex-vivo evaluation of a telerobotic system for transurethral intervention and surveillance, The 5th Hamlyn Symp. Medical Robotics (2012), pp. 3-4; [2] A. Bajo, R. B. Pickens, S. D. Herrell, N. Simaan: Constrained motion control of multisegment continuum robots for transurethral bladder resection and surveillance, Proc. IEEE Int. Conf. Robot. Autom. (ICRA), Karlsruhe (2013), pp. 5817-5822; [3] R. E. Goldman, A. Bajo, L. S. MacLachlan, R. Pickens, S. D. Herrell, N. Simaan: Design and performance evaluation of a minimally invasive telerobotic platform for transurethral surveillance and intervention, IEEE Trans. Biomed. Eng. 60(4), 918-925 (2013)

Chapter 43 — Telerobotics

Günter Niemeyer, Carsten Preusche, Stefano Stramigioli and Dongjun Lee

In this chapter we present an overview of the field of telerobotics with a focus on control aspects. To acknowledge some of the earliest contributions and motivations the field has provided to robotics in general, we begin with a brief historical perspective and discuss some of the challenging applications. Then, after introducing and classifying the various system architectures and control strategies, we emphasize bilateral control and force feedback. This particular area has seen intense research work in the pursuit of telepresence. We also examine some of the emerging efforts, extending telerobotic concepts to unconventional systems and applications. Finally,we suggest some further reading for a closer engagement with the field.

Teleoperated hmanoid robot - HRP

Author  O. Miki, T. Itoko, K. Sawada, T. Nishiyama, K. Hira, S. Nakayama, H. Inaba, M. Sudo, K. Tanie, K. Yokoi, S. Hira, H. Hirukawa, H. Inoue, S. Tachi

Video ID : 318

This video shows a tele-existence system to teleoperate a humanoid robot HRP using multimodal feedback and integrated whole-body perception and control. Presented at ICRA 2001.

Chapter 20 — Snake-Like and Continuum Robots

Ian D. Walker, Howie Choset and Gregory S. Chirikjian

This chapter provides an overview of the state of the art of snake-like (backbones comprised of many small links) and continuum (continuous backbone) robots. The history of each of these classes of robot is reviewed, focusing on key hardware developments. A review of the existing theory and algorithms for kinematics for both types of robot is presented, followed by a summary ofmodeling of locomotion for snake-like and continuum mechanisms.

Binary manipulator grasping

Author  Greg Chirikjian

Video ID : 162

Simulation of Greg Chirikjian's binary manipulator grasping a cylindrical object.

Chapter 21 — Actuators for Soft Robotics

Alin Albu-Schäffer and Antonio Bicchi

Although we do not know as yet how robots of the future will look like exactly, most of us are sure that they will not resemble the heavy, bulky, rigid machines dangerously moving around in old fashioned industrial automation. There is a growing consensus, in the research community as well as in expectations from the public, that robots of the next generation will be physically compliant and adaptable machines, closely interacting with humans and moving safely, smoothly and efficiently - in other terms, robots will be soft.

This chapter discusses the design, modeling and control of actuators for the new generation of soft robots, which can replace conventional actuators in applications where rigidity is not the first and foremost concern in performance. The chapter focuses on the technology, modeling, and control of lumped parameters of soft robotics, that is, systems of discrete, interconnected, and compliant elements. Distributed parameters, snakelike and continuum soft robotics, are presented in Chap. 20, while Chap. 23 discusses in detail the biomimetic motivations that are often behind soft robotics.

CompAct™ robotics technology

Author  Istituto Italiano di Tecnologia (IIT)

Video ID : 471

Brief video showing CompAct™ actuation units and arm, demonstrating the effects of its core variable damping (VPDA) technology. Key features of these units include: 1. intrinsic safety (lightweight and elastic transmission) meant for safe human-robot collaboration; 2. precision, thanks to the variable damping transmission, protected by international patents; 3. ease of use (no need for experts to program it, easy to reprogram, flexible to use).

Chapter 72 — Social Robotics

Cynthia Breazeal, Kerstin Dautenhahn and Takayuki Kanda

This chapter surveys some of the principal research trends in Social Robotics and its application to human–robot interaction (HRI). Social (or Sociable) robots are designed to interact with people in a natural, interpersonal manner – often to achieve positive outcomes in diverse applications such as education, health, quality of life, entertainment, communication, and tasks requiring collaborative teamwork. The long-term goal of creating social robots that are competent and capable partners for people is quite a challenging task. They will need to be able to communicate naturally with people using both verbal and nonverbal signals. They will need to engage us not only on a cognitive level, but on an emotional level as well in order to provide effective social and task-related support to people. They will need a wide range of socialcognitive skills and a theory of other minds to understand human behavior, and to be intuitively understood by people. A deep understanding of human intelligence and behavior across multiple dimensions (i. e., cognitive, affective, physical, social, etc.) is necessary in order to design robots that can successfully play a beneficial role in the daily lives of people. This requires a multidisciplinary approach where the design of social robot technologies and methodologies are informed by robotics, artificial intelligence, psychology, neuroscience, human factors, design, anthropology, and more.

Overview of Kismet's expressive behavior

Author  Cynthia Breazeal

Video ID : 557

This video presents an overview of Kismet's expressive behavior and rationale. The video presents how Kismet can express internal emotive/affective states through three modalities: facial expression, vocal affect, and body posture. The video also shows how Kismet can recognize aspects of affective intent in human speech (e.g., praising, scolding, soothing, and attentional bids). The video shows how human participants can interact in a natural and intuitive way with the robot, by reading and responding to its emotive and social cues.

Chapter 7 — Motion Planning

Lydia E. Kavraki and Steven M. LaValle

This chapter first provides a formulation of the geometric path planning problem in Sect. 7.2 and then introduces sampling-based planning in Sect. 7.3. Sampling-based planners are general techniques applicable to a wide set of problems and have been successful in dealing with hard planning instances. For specific, often simpler, planning instances, alternative approaches exist and are presented in Sect. 7.4. These approaches provide theoretical guarantees and for simple planning instances they outperform samplingbased planners. Section 7.5 considers problems that involve differential constraints, while Sect. 7.6 overviews several other extensions of the basic problem formulation and proposed solutions. Finally, Sect. 7.8 addresses some important andmore advanced topics related to motion planning.

Motion planning in multi-robot scenario.

Author  Jamie Snape, Jur van den Berg, Stephen J. Guy, Dinesh Manocha

Video ID : 22

Motion planning can be used for multiple robot scenarios. In this video, each iRobot Roomba senses its surroundings and acts independently without central coordination or communication with other robots. This approach uses the current position and the velocity of other robots to predict their future trajectories in order to avoid collisions.

Chapter 56 — Robotics in Agriculture and Forestry

Marcel Bergerman, John Billingsley, John Reid and Eldert van Henten

Robotics for agriculture and forestry (A&F) represents the ultimate application of one of our society’s latest and most advanced innovations to its most ancient and important industries. Over the course of history, mechanization and automation increased crop output several orders of magnitude, enabling a geometric growth in population and an increase in quality of life across the globe. Rapid population growth and rising incomes in developing countries, however, require ever larger amounts of A&F output. This chapter addresses robotics for A&F in the form of case studies where robotics is being successfully applied to solve well-identified problems. With respect to plant crops, the focus is on the in-field or in-farm tasks necessary to guarantee a quality crop and, generally speaking, end at harvest time. In the livestock domain, the focus is on breeding and nurturing, exploiting, harvesting, and slaughtering and processing. The chapter is organized in four main sections. The first one explains the scope, in particular, what aspects of robotics for A&F are dealt with in the chapter. The second one discusses the challenges and opportunities associated with the application of robotics to A&F. The third section is the core of the chapter, presenting twenty case studies that showcase (mostly) mature applications of robotics in various agricultural and forestry domains. The case studies are not meant to be comprehensive but instead to give the reader a general overview of how robotics has been applied to A&F in the last 10 years. The fourth section concludes the chapter with a discussion on specific improvements to current technology and paths to commercialization.

An autonomous cucumber harvester

Author  Elder J. van Henten, Jochen Hemming, Bart A.J. van Tuijl, J.G. Kornet, Jan Meuleman, Jan Bontsema, Erik A. van Os

Video ID : 308

The video demonstrates an autonomous cucumber harvester developed at Wageningen University and Research Centre, Wageningen, The Netherlands. The machine consists of a mobile platform which runs on rails, which are commonly used in greenhouses in The Netherlands for the purpose of internal transport, but they are also used as a hot- water heating system for the greenhouse. Harvesting requires functional steps such as the detection and localization of the fruit and assessment of its ripeness. In the case of the cucumber harvester, the different reflection properties in the near infrared spectrum are exploited to detect green cucumbers in the green environment. Whether the cucumber was ready for harvest was identified based on an estimation of its weight. Since cucumbers consist 95% of water, the weight estimation was achieved by estimating the volume of each fruit. Stereo-vision principles were then used to locate the fruits to be harvested in the 3-D environment. For that purpose, the camera was shifted 50 mm on a linear slide and two images of the same scene were taken and processed. A Mitsubishi RV-E2 manipulator was used to steer the gripper-cutter mechanism to the fruit and transport the harvested fruit back to a storage crate. Collision-free motion planning based on the A* algorithm was used to steer the manipulator during the harvesting operation. The cutter consisted of a parallel gripper that grabbed the peduncle of the fruit, i.e., the stem segment that connects the fruit to the main stem of the plant. Then the action of a suction cup immobilized the fruit in the gripper. A special thermal cutting device was used to separate the fruit from the plant. The high temperature of the cutting device also prevented the potential transport of viruses from one plant to the other during the harvesting process. For each successful cucumber harvested, this machine needed 65.2 s on average. The average success rate was 74.4%. It was found to be a great advantage that the system was able to perform several harvest attempts on a single cucumber from different harvest positions of the robot. This improved the success rate considerably. Since not all attempts were successful, a cycle time of 124 s per harvested cucumber was measured under practical circumstances.

Chapter 11 — Robots with Flexible Elements

Alessandro De Luca and Wayne J. Book

Design issues, dynamic modeling, trajectory planning, and feedback control problems are presented for robot manipulators having components with mechanical flexibility, either concentrated at the joints or distributed along the links. The chapter is divided accordingly into two main parts. Similarities or differences between the two types of flexibility are pointed out wherever appropriate.

For robots with flexible joints, the dynamic model is derived in detail by following a Lagrangian approach and possible simplified versions are discussed. The problem of computing the nominal torques that produce a desired robot motion is then solved. Regulation and trajectory tracking tasks are addressed by means of linear and nonlinear feedback control designs.

For robots with flexible links, relevant factors that lead to the consideration of distributed flexibility are analyzed. Dynamic models are presented, based on the treatment of flexibility through lumped elements, transfer matrices, or assumed modes. Several specific issues are then highlighted, including the selection of sensors, the model order used for control design, and the generation of effective commands that reduce or eliminate residual vibrations in rest-to-rest maneuvers. Feedback control alternatives are finally discussed.

In each of the two parts of this chapter, a section is devoted to the illustration of the original references and to further readings on the subject.

Rest-to-rest motion for a flexible link

Author  Alessandro De Luca

Video ID : 779

This 2003 video shows a planar one-link flexible arm executing a desired rest-to-rest motion in a given finite time (90 deg in 2 s). Link deformations vanish completely at the desired final time. The applied control law is the combination of a model-based feedforward command designed for a smooth trajectory assigned to the flat output of the system and of a stabilizing PID feedback action on the joint angle around its associated trajectory. References: 1. A. De Luca, G. Di Giovanni: Rest-to-rest motion of a one-link flexible arm, Proc. IEEE/ASME Int. Conf. Adv. Intell. Mechatron., Como (2001), pp. 923-928; doi: 10.1109/AIM.2001.936793; 2. A. De Luca, V. Caiano, D. Del Vescovo: Experiments on rest-to-rest motion of a flexible arm, in B. Siciliano, P. Dario (Eds), Experimental Robotics VIII, Springer Tract. Adv. Robot. 5, 338-349 (2003); doi: 10.1007/3-540-36268-1_30