1
|
Dai S, Hu C, Ma L, Zhang X, Zhang H, Liao H. A stiffness-tunable soft actuator inspired by helix for medical applications. Int J Comput Assist Radiol Surg 2023; 18:1625-1638. [PMID: 37178187 DOI: 10.1007/s11548-023-02902-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 03/31/2023] [Indexed: 05/15/2023]
Abstract
PURPOSE This paper introduces the stiffness-tunable soft actuator (STSA), a novel device that combines a silicone body with a thermoplastic resin structure (TPRS). The STSA's design allows for the variable stiffness of soft robots, significantly increasing their potential for use in medical scenarios such as minimally invasive surgeries (MIS). By adjusting the stiffness of the STSA, it is possible to enhance the robot's dexterity and adaptability, making it a promising tool for performing complex tasks in narrow and delicate spaces. METHODS The stiffness of the STSA can be modulated by altering the temperature of the TPRS, which has been inspired by the helix and is integrated into the soft actuator to achieve a broad range of stiffness modulation while maintaining flexibility. The STSA has been designed with both diagnostic and therapeutic functions in mind, with the hollow area of the TPRS serving as an instrument channel for delivering surgical instruments. Additionally, the STSA features three uniformly arranged pipelines for actuation by air or tendon, and can be expanded with more functional chambers for endoscopy, illumination, water injection, and other purposes. RESULTS Experimental results show that the STSA can achieve a maximum 30-fold stiffness tuning, providing a significant improvement in load capacity and stability when compared to pure soft actuators (PSAs). Of particular importance, the STSA is capable of achieving stiffness modulation below 45 °C, thereby ensuring a safe entry into the human body and creating an environment conducive to the normal operation of surgical instruments such as endoscope. CONCLUSION The experimental findings indicate that the soft actuator with TPRS can achieve a broad range of stiffness modulation while retaining flexibility. Moreover, the STSA can be designed to have a diameter of 8-10 mm, which satisfies the diameter requirements of a bronchoscope. Furthermore, the STSA has the potential to be utilized for clamping and ablation in a laparoscopic scenario, thereby demonstrating its potential for clinical use. Overall, these results suggest that the STSA has significant promise for use in medical applications, particularly in the context of minimally invasive surgeries.
Collapse
Affiliation(s)
- Shangqi Dai
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Chengquan Hu
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Longfei Ma
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Xinran Zhang
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Hui Zhang
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Hongen Liao
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China.
| |
Collapse
|
2
|
Tauber F, Desmulliez M, Piccin O, Stokes AA. Perspective for soft robotics: the field's past and future. BIOINSPIRATION & BIOMIMETICS 2023; 18:035001. [PMID: 36764003 DOI: 10.1088/1748-3190/acbb48] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Since its beginnings in the 1960s, soft robotics has been a steadily growing field that has enjoyed recent growth with the advent of rapid prototyping and the provision of new flexible materials. These two innovations have enabled the development of fully flexible and untethered soft robotic systems. The integration of novel sensors enabled by new manufacturing processes and materials shows promise for enabling the production of soft systems with 'embodied intelligence'. Here, four experts present their perspectives for the future of the field of soft robotics based on these past innovations. Their focus is on finding answers to the questions of: how to manufacture soft robots, and on how soft robots can sense, move, and think. We highlight industrial production techniques, which are unused to date for manufacturing soft robots. They discuss how novel tactile sensors for soft robots could be created to enable better interaction of the soft robot with the environment. In conclusion this article highlights how embodied intelligence in soft robots could be used to make soft robots think and to make systems that can compute, autonomously, from sensory inputs.
Collapse
Affiliation(s)
- Falk Tauber
- Plant Biomechanics Group (PBG) Freiburg, Botanic Garden of the University of Freiburg, Freiburg, Germany
- Cluster of Excellence livMatS @ FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Freiburg, Germany
| | - Marc Desmulliez
- Research Institute of Sensors, Signals and Systems (ISSS), School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh, United Kingdom
| | - Olivier Piccin
- ICube-INSA Strasbourg, University of Strasbourg, Strasbourg, France
| | - Adam A Stokes
- School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| |
Collapse
|
3
|
Peng WZ, Song H, Czarkowski D, Kim JH. Switched electromechanical dynamics for transient phase control of brushed DC servomotor. CHAOS (WOODBURY, N.Y.) 2022; 32:123119. [PMID: 36587348 DOI: 10.1063/5.0101432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 11/07/2022] [Indexed: 06/17/2023]
Abstract
Robotic tasks often exceed the scope of steady-state or periodic behavior, which necessitates generally-applicable models of actuators intended to generate transient or aperiodic motion. However, existing electromechanical models of servomotors typically omit consideration of the switching power converter circuits required for directional, speed, or torque control. In this study, a multi-domain framework is established for switched electromechanical dynamics in servomotor systems for their analysis and control in general aperiodic tasks including transient phases. The switched electromechanical dynamics is derived from the individual models of the internal DC motor, gear train, and H-bridge circuit. The coupled models comprehensively integrate all possible distinct switching configurations of on-state, off-state, and dead time. A combination of cycle averaging with piecewise analytical solutions of the non-smooth dynamics is introduced to handle different temporal scales from high-frequency electrical to low-frequency mechanical variables. System parameters were estimated from experimental data using a dual-servomotor test platform. The model was validated for predictive accuracy against measured data in two distinct tasks-dynamic braking of a pendulum system and sinusoidal trajectory following. The model was also used to formulate the servomotor power consumption, which was implemented for optimal control demonstration and energy analysis. In particular, the servomotor power consumption model provided true optimality (minimization) when compared with the squared rotor torque and the positive rotor mechanical power that are commonly used as proxy models. While the focus of this work is on permanent-magnet, armature-controlled brushed DC servomotors, the approach is applicable to general electromechanical systems with switching-based control.
Collapse
Affiliation(s)
- William Z Peng
- Department of Mechanical and Aerospace Engineering, New York University, Brooklyn, New York 11201, USA
| | - Hyunjong Song
- Department of Mechanical and Aerospace Engineering, New York University, Brooklyn, New York 11201, USA
| | - Dariusz Czarkowski
- Department of Electrical and Computer Engineering, New York University, Brooklyn, New York 11201, USA
| | - Joo H Kim
- Department of Mechanical and Aerospace Engineering, New York University, Brooklyn, New York 11201, USA
| |
Collapse
|
4
|
Li D, Fan D, Zhu R, Lei Q, Liao Y, Yang X, Pan Y, Wang Z, Wu Y, Liu S, Wang H. Origami-Inspired Soft Twisting Actuator. Soft Robot 2022; 10:395-409. [PMID: 36318818 DOI: 10.1089/soro.2021.0185] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Soft actuators have shown great advantages in compliance and morphology matched for manipulation of delicate objects and inspection in a confined space. There is an unmet need for a soft actuator that can provide torsional motion to, for example, enlarge working space and increase degrees of freedom. Toward this goal, we present origami-inspired soft pneumatic actuators (OSPAs) made from silicone. The prototype can output a rotation of more than one revolution (up to 435°), more significant than its counterparts. Its rotation ratio ( = rotation angle/aspect ratio) is more than 136°, about twice the largest one in other literature. We describe the design and fabrication method, build the analytical model and simulation model, and analyze and optimize the parameters. Finally, we demonstrate the potentially extensive utility of the OSPAs through their integration into a gripper capable of simultaneously grasping and lifting fragile or flat objects, a versatile robot arm capable of picking and placing items at the right angle with the twisting actuators, and a soft snake robot capable of changing attitude and directions by torsion of the twisting actuators.
Collapse
Affiliation(s)
- Diancheng Li
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
- Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities, Southern University of Science and Technology, Shenzhen, China
| | - Dongliang Fan
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Renjie Zhu
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Qiaozhi Lei
- Education Center of Experiments and Innovations, Harbin Institute of Technology (Shenzhen), Shenzhen, China
| | - Yuxuan Liao
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Xin Yang
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Yang Pan
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Zheng Wang
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
- Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities, Southern University of Science and Technology, Shenzhen, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
| | - Yang Wu
- School of Mechanical Engineering and Automation, Harbin Institute of Technology (Shenzhen), Shenzhen, China
| | - Sicong Liu
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Hongqiang Wang
- Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
- Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities, Southern University of Science and Technology, Shenzhen, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
| |
Collapse
|
5
|
Aracri S, Giorgio-Serchi F, Suaria G, Sayed ME, Nemitz MP, Mahon S, Stokes AA. Soft Robots for Ocean Exploration and Offshore Operations: A Perspective. Soft Robot 2021; 8:625-639. [PMID: 33450174 PMCID: PMC8713554 DOI: 10.1089/soro.2020.0011] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The ocean and human activities related to the sea are under increasing pressure
due to climate change, widespread pollution, and growth of the offshore energy
sector. Data, in under-sampled regions of the ocean and in the offshore patches
where the industrial expansion is taking place, are fundamental to manage
successfully a sustainable development and to mitigate climate change. Existing
technology cannot cope with the vast and harsh environments that need monitoring
and sampling the most. The limiting factors are, among others, the spatial
scales of the physical domain, the high pressure, and the strong hydrodynamic
perturbations, which require vehicles with a combination of persistent autonomy,
augmented efficiency, extreme robustness, and advanced control. In light of the
most recent developments in soft robotics technologies, we propose that the use
of soft robots may aid in addressing the challenges posed by abyssal and
wave-dominated environments. Nevertheless, soft robots also allow for fast and
low-cost manufacturing, presenting a new potential problem: marine pollution
from ubiquitous soft sampling devices. In this study, the technological and
scientific gaps are widely discussed, as they represent the driving factors for
the development of soft robotics. Offshore industry supports increasing energy
demand and the employment of robots on marine assets is growing. Such expansion
needs to be sustained by the knowledge of the oceanic environment, where large
remote areas are yet to be explored and adequately sampled. We offer our
perspective on the development of sustainable soft systems, indicating the
characteristics of the existing soft robots that promote underwater
maneuverability, locomotion, and sampling. This perspective encourages an
interdisciplinary approach to the design of aquatic soft robots and invites a
discussion about the industrial and oceanographic needs that call for their
application.
Collapse
Affiliation(s)
- Simona Aracri
- Scottish Microelectronics Centre, Institute for Integrated Micro and Nano Systems, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - Francesco Giorgio-Serchi
- Scottish Microelectronics Centre, Institute for Integrated Micro and Nano Systems, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - Giuseppe Suaria
- Institute of Marine Sciences-National Research Council (ISMAR-CNR), La Spezia, Italy
| | - Mohammed E Sayed
- Scottish Microelectronics Centre, Institute for Integrated Micro and Nano Systems, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - Markus P Nemitz
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA.,Robotics Engineering Program, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts, USA
| | - Stephen Mahon
- Scottish Microelectronics Centre, Institute for Integrated Micro and Nano Systems, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - Adam A Stokes
- Scottish Microelectronics Centre, Institute for Integrated Micro and Nano Systems, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| |
Collapse
|
6
|
Boothby JM, Gagnon JC, McDowell E, Van Volkenburg T, Currano L, Xia Z. An Untethered Soft Robot Based on Liquid Crystal Elastomers. Soft Robot 2021; 9:154-162. [PMID: 33411636 DOI: 10.1089/soro.2020.0135] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
An untethered, soft robot using liquid crystal elastomer (LCE) actuators, onboard power, and wireless Bluetooth control was developed. LCE actuators were thermally triggered using Joule heating and demonstrated an ∼5 N force pull capacity per LCE. A >20% repeatable strain was demonstrated over >100 cycles with minimal loss of strain at high cycle numbers. The LCE actuators were horizontally oriented to maximize conversion of LCE contraction to overall robot movement. A battery and control board were integrated into the body of the robot, which allowed for Bluetooth control of the LCE on/off cycle. System level programming and design were implemented to offset the slow recovery associated with LCE actuators. The multiple LCE actuator legs were programmed to allow individual control of on/off cycles for each leg. LCE leg actuation was alternated between inner and outer legs to provide horizontal movement with minimized loss of motion during the LCE recovery cycle by actuating one set of legs during the recovery cycle of the other set for a maximum movement speed of 1.27 cm/min. Path control was also demonstrated by turning the robot by actuating two LCE legs on one side of the robot. The robot was able to pull up to 1400 g in ideal frictional conditions, allowing the possibility of payload transport, additional battery storage, or onboard sensors. Additional design considerations are discussed to further improve overall robot speed in the future by combining system and material level design considerations.
Collapse
Affiliation(s)
- Jennifer M Boothby
- Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
| | - Jarod C Gagnon
- Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
| | - Emil McDowell
- Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
| | | | - Luke Currano
- Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
| | - Zhiyong Xia
- Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
| |
Collapse
|
7
|
Gao RZ, Ren CL. Synergizing microfluidics with soft robotics: A perspective on miniaturization and future directions. BIOMICROFLUIDICS 2021; 15:011302. [PMID: 33564346 PMCID: PMC7861881 DOI: 10.1063/5.0036991] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 01/19/2021] [Indexed: 05/12/2023]
Abstract
Soft robotics has gone through a decade of tremendous progress in advancing both fundamentals and technologies. It has also seen a wide range of applications such as surgery assistance, handling of delicate foods, and wearable assistive systems driven by its soft nature that is more human friendly than traditional hard robotics. The rapid growth of soft robotics introduces many challenges, which vary with applications. Common challenges include the availability of soft materials for realizing different functions and the precision and speed of control required for actuation. In the context of wearable systems, miniaturization appears to be an additional hurdle to be overcome in order to develop truly impactful systems with a high user acceptance. Microfluidics as a field of research has gone through more than two decades of intense and focused research resulting in many fundamental theories and practical tools that have the potentials to be applied synergistically to soft robotics toward miniaturization. This perspective aims to introduce the potential synergy between microfluidics and soft robotics as a research topic and suggest future directions that could leverage the advantages of the two fields.
Collapse
|
8
|
Sridar S, Poddar S, Tong Y, Polygerinos P, Zhang W. Towards Untethered Soft Pneumatic Exosuits Using Low-Volume Inflatable Actuator Composites and a Portable Pneumatic Source. IEEE Robot Autom Lett 2020. [DOI: 10.1109/lra.2020.2986744] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
9
|
Franco E, Garriga-Casanovas A. Energy-shaping control of soft continuum manipulators with in-plane disturbances. Int J Rob Res 2020. [DOI: 10.1177/0278364920907679] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Soft continuum manipulators offer levels of compliance and inherent safety that can render them a superior alternative to conventional rigid robots for a variety of tasks, such as medical interventions or human–robot interaction. However, the ability of soft continuum manipulators to compensate for external disturbances needs to be further enhanced to meet the stringent requirements of many practical applications. In this paper, we investigate the control problem for soft continuum manipulators that consist of one inextensible segment of constant section, which bends under the effect of the internal pressure and is subject to unknown disturbances acting in the plane of bending. A rigid-link model of the manipulator with a single input pressure is employed for control purposes and an energy-shaping approach is proposed to derive the control law. A method for the adaptive estimation of disturbances is detailed and a disturbance compensation strategy is proposed. Finally, the effectiveness of the controller is demonstrated with simulations and with experiments on an inextensible soft continuum manipulator that employs pneumatic actuation.
Collapse
Affiliation(s)
- Enrico Franco
- Mechatronics in Medicine Laboratory, Mechanical Engineering Department, Imperial College London, UK
| | - Arnau Garriga-Casanovas
- Mechatronics in Medicine Laboratory, Mechanical Engineering Department, Imperial College London, UK
| |
Collapse
|
10
|
Talas SK, Baydere BA, Altinsoy T, Tutcu C, Samur E. Design and Development of a Growing Pneumatic Soft Robot. Soft Robot 2020; 7:521-533. [PMID: 32150509 DOI: 10.1089/soro.2019.0083] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Soft continuum robots are getting more popular in areas such as minimally invasive surgery, search and rescue, and inspection due to their inherent compliance and flexibility. However, most of the conventional continuum robots still lack the ability to significantly change size and length. Growth as a means of robotic locomotion is a novel actuation method that can be used to overcome this disadvantage. In this study, we introduce a growing pneumatic soft robot made up of pressurized thin-walled tubings that can move in three-dimensional space with an extension ratio only limited by manufacturing capabilities. Besides the ability to grow from the tip, this design provides active steering by controlling the speed of each tubing separately, controllable stiffness that can be changed during motion, and capability to carry a tool channel. We present models to estimate tip force and position and experimentally verify the force model and robot kinematics. Open-loop speed controller has an overall root mean square error of 2.69% for speeds between 20 and 300 mm/s. The position controller based on the kinematic model has a mean positioning error of 13.9 mm at 100 mm and 22.6 mm at 200 mm longitudinal distance. Robot can produce a tip force of 20.1 N at 150 kPa tubing pressure and reach a maximum speed of 1490 mm/s at 100 kPa. We also demonstrate the navigation capabilities of the robot both in open field and in constrained environments.
Collapse
Affiliation(s)
- Seref Kemal Talas
- Department of Mechanical Engineering, Bogazici University, Istanbul, Turkey
| | - Bora Alp Baydere
- Department of Mechanical Engineering, Bogazici University, Istanbul, Turkey
| | - Timur Altinsoy
- Department of Mechanical Engineering, Bogazici University, Istanbul, Turkey
| | - Cem Tutcu
- Department of Mechanical Engineering, Bogazici University, Istanbul, Turkey
| | - Evren Samur
- Department of Mechanical Engineering, Bogazici University, Istanbul, Turkey
| |
Collapse
|
11
|
Zhang H, Kumar AS, Fuh JYH, Wang MY. Design and Development of a Topology-Optimized Three-Dimensional Printed Soft Gripper. Soft Robot 2018; 5:650-661. [PMID: 29985781 DOI: 10.1089/soro.2017.0058] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In the past decade, a rich repertoire of soft robots, designed from biomimetic and intuitive approaches, has been developed to overcome challenges faced by their rigid-bodied counterparts. However, these design approaches are greatly limited by the designers' experience and inspiration. In this article, the structural design problem is mathematically modeled under the framework of topology optimization, and solved by a new implementation tool that combines Abaqus/CAE and Matlab coding. Herein, a pneumatic soft gripper with two identical fingers was developed as a practical application. To fulfill the grasping task, each gripper finger is optimized to achieve its maximal bending deformation. The optimized gripper fingers are in high consistence with human fingers as indicated by pseudo-joints. Thereafter, the optimized gripper fingers are directly fabricated by three-dimensional printing technique with unprecedented fidelity regardless of high geometric complexity. Experimental results show that the gripper can grasp an elastic balloon, and each gripper finger is able to undergo a [Formula: see text] free travel bending and exert 0.23 N grasping force upon 0.06 MPa actuation pressure. The proposed approach is freely extendable to develop other types of soft robots and this represents an important step toward the goal of designing and fabricating soft robots automatically.
Collapse
Affiliation(s)
- Hongying Zhang
- 1 Department of Mechanical Engineering, National University of Singapore , Singapore, Singapore
| | - A Senthil Kumar
- 1 Department of Mechanical Engineering, National University of Singapore , Singapore, Singapore
| | - Jerry Ying Hsi Fuh
- 1 Department of Mechanical Engineering, National University of Singapore , Singapore, Singapore
| | - Michael Yu Wang
- 2 Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong .,3 Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| |
Collapse
|
12
|
Abstract
This description of "soft robotics" is not intended to be a conventional review, in the sense of a comprehensive technical summary of a developing field. Rather, its objective is to describe soft robotics as a new field-one that offers opportunities to chemists and materials scientists who like to make "things" and to work with macroscopic objects that move and exert force. It will give one (personal) view of what soft actuators and robots are, and how this class of soft devices fits into the more highly developed field of conventional "hard" robotics. It will also suggest how and why soft robotics is more than simply a minor technical "tweak" on hard robotics and propose a unique role for chemistry, and materials science, in this field. Soft robotics is, at its core, intellectually and technologically different from hard robotics, both because it has different objectives and uses and because it relies on the properties of materials to assume many of the roles played by sensors, actuators, and controllers in hard robotics.
Collapse
Affiliation(s)
- George M Whitesides
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| |
Collapse
|
13
|
Affiliation(s)
- George M. Whitesides
- Department of Chemistry and Chemical Biology; Harvard University; Cambridge MA USA
| |
Collapse
|
14
|
McKenzie RM, Barraclough TW, Stokes AA. Integrating Soft Robotics with the Robot Operating System: A Hybrid Pick and Place Arm. Front Robot AI 2017. [DOI: 10.3389/frobt.2017.00039] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
15
|
Nemiroski A, Shevchenko YY, Stokes AA, Unal B, Ainla A, Albert S, Compton G, MacDonald E, Schwab Y, Zellhofer C, Whitesides GM. Arthrobots. Soft Robot 2017; 4:183-190. [PMID: 29182080 DOI: 10.1089/soro.2016.0043] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This article describes a class of robots-"arthrobots"-inspired, in part, by the musculoskeletal system of arthropods (spiders and insects, inter alia). Arthrobots combine mechanical compliance, lightweight and simple construction, and inexpensive yet scalable design. An exoskeleton, constructed from thin organic polymeric tubes, provides lightweight structural support. Pneumatic joints modeled after the hydrostatic joints of spiders provide actuation and inherent mechanical compliance to external forces. An inflatable elastomeric tube (a "balloon") enables active extension of a limb; an opposing elastic tendon enables passive retraction. A variety of robots constructed from these structural elements demonstrate (i) crawling with one or two limbs, (ii) walking with four or six limbs (including an insect-like triangular gait), (iii) walking with eight limbs, or (iv) floating and rowing on the surface of water. Arthrobots are simple to fabricate and are able to operate safely in contact with humans.
Collapse
Affiliation(s)
- Alex Nemiroski
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Yanina Y Shevchenko
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Adam A Stokes
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Baris Unal
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Alar Ainla
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Sahradha Albert
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Gabrielle Compton
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Emily MacDonald
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Yosyp Schwab
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - Caroline Zellhofer
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts
| | - George M Whitesides
- 1 Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts.,2 Wyss Institute for Biologically Inspired Engineering, Harvard University , Cambridge, Massachusetts.,3 Kavli Institute for Bionano Science and Technology, Harvard University , Cambridge, Massachusetts
| |
Collapse
|