Modeling Cellular Actuator Arrays

Modeling Cellular Actuator Arrays
Author: David Luke MacNair
Publisher:
Total Pages:
Release: 2013
Genre: Actuators
ISBN:

This work explores the representations and mathematical modeling of biologically-inspired robotic muscles called Cellular Actuator Arrays. These actuator arrays are made of many small interconnected actuation units which work together to provide force, displacement, robustness and other properties beyond the original actuator's capability. The arrays can also exhibit properties generally associated with biological muscle and can thus provide test bed for research into the interrelated nature of the nervous system and muscles, kinematics/dynamics experiments to understand balance and synergies, and building full-strength, safe muscles for prosthesis, rehabilitation, human force amplification, and humanoid robotics. This thesis focuses on the mathematical tools needed bridge the gap between the conceptual idea of the cellular actuator array and the engineering design processes needed to build physical robotic muscles. The work explores the representation and notation needed to express complex actuator array typologies, the mathematical modeling needed to represent the complex dynamics of the arrays, and properties to guide the selection of arrays for engineering purposes. The approach is designed to aid automation and simulation of actuator arrays and provide an intuitive base for future controls and physiology work. The work is validated through numerical results using MatLab's SimMechanics dynamic modeling system and with three physical actuator arrays built using solenoids and shape memory alloy actuators.

Cellular Actuators

Cellular Actuators
Author: Jun Ueda
Publisher: Butterworth-Heinemann
Total Pages: 384
Release: 2017-01-24
Genre: Computers
ISBN: 0128037067

Cellular Actuators: Modularity and Variability in Muscle-Inspired Actuation describes the roles actuators play in robotics and their insufficiency in emerging new robotic applications, such as wearable devices and human co-working robots where compactness and compliance are important. Piezoelectric actuators, the topic of this book, provide advantages like displacement scale, force, reliability, and compactness, and rely on material properties to provide displacement and force as reactions to electric stimulation. The authors, renowned researchers in the area, present the fundamentals of muscle-like movement and a system-wide study that includes the design, analysis, and control of biologically inspired actuators. This book is the perfect guide for researchers and practitioners who would like to deploy this technology into their research and products. Introduces Piezoelectric Actuators concepts in a system wide integrated approach Acts as a single source for the design, analysis, and control of actuator arrays Presents applications to illustrate concepts and the potential of the technology Details the physical assembly possibilities of Piezo actuators Presents fundamentals of bio inspired actuation Introduces the concept of cellular actuators

Soft Actuators

Soft Actuators
Author: Kinji Asaka
Publisher: Springer
Total Pages: 492
Release: 2014-11-17
Genre: Technology & Engineering
ISBN: 4431547673

The subject of this book is the current comprehensive research and development of soft actuators, and encompasses interdisciplinary studies of materials science, mechanics, electronics, robotics and bioscience. As an example, the book includes current research on actuators based on biomaterials to provide future perspectives for artificial muscle technology. Readers can obtain detailed, useful information about materials, methods of synthesis, fabrication and measurements. The topics covered here not only promote further research and development of soft actuators but also lead the way to their utilization and industrialization. One outstanding feature of the book is that it contains many color figures, diagrams and photographs clearly describing the mechanism, apparatus and motion of soft actuators. The chapter on modeling is conducive to more extensive design work in materials and devices and is especially useful in the development of practical applications. Readers can acquire the newest technology and information about the basic science and practical applications of flexible, lightweight and noiseless soft actuators, which are quite unlike conventional mechanical engines and electric motors. The new ideas offered in this volume will provide inspiration and encouragement to researchers and developers as they explore new fields of applications for soft actuators.

Simulation, Fabrication, and Control of Biomimetic Actuator Arrays

Simulation, Fabrication, and Control of Biomimetic Actuator Arrays
Author: Benjamin Marc O'Brien
Publisher:
Total Pages: 169
Release: 2010
Genre: Actuators
ISBN:

Ctenophores are small sea creatures that achieve propulsion using thousands of locally controlled ciliated paddles. The human heart is a flexible network of actuators coordinated with electro-chemo-mechanical waves of contraction. Stomata are self-controlling variable apertures that work together to solve the gas exchange problem for plants. It can be seen that flexible networks of actuators coordinated using distributed intelligence and sensing provide robust and adaptable performance in the face of complex and varied challenges. This thesis aims to create networks of flexible actuators with distributed sensitivity and intelligence that realise the robust and adaptable performance seen in nature. Dielectric Elastomer Actuator(s) (DEA) were identified as ideal for achieving this goal, however, their implementation into biomimetic arrays was limited by a lack of modelling tools for engineering design; the fact that DEA self-sensing has never been used to underpin a control strategy; and rigid and bulky sensor, logic, and driver circuitry. The objectives of this thesis were to overcome these three problems: Firstly, a novel low degrees-of-freedom modelling approach was developed and experimentally validated using dielectric elastomer minimum energy structures. The approach was rapid and robust and applied as a virtual experimentation tool where it reduced prototype development times by an order of magnitude. Secondly, biomimetic distributed control using capacitive self-sensing was explored and applied to a variety of DEA arrays including a ctenophore inspired mechano-sensitive artificial cilia array. Actuator coupling, multilevel control, travelling waves of actuation, and performance under partial failure were explored. Finally, Dielectric Elastomer Switch(es) (DES) were invented. DES enable distributed sensor, driver, and logic circuitry to be integrated directly into a biomimetic array and substantially reduce the need for rigid, heavy, and expensive external circuitry. DES were used to create NAND gates, smart oscillator circuits, and memory elements. These contributions have led to two journal articles, three conference papers, two provisional patent applications, and should substantially accelerate progress towards the development and control of large scale biomimetic actuator arrays. Future work involves applying modelling and control techniques to micro-scale systems and developing DES applications, materials, and fabrication techniques further.

Design, Modeling and Experiments of 3-DOF Electromagnetic Spherical Actuators

Design, Modeling and Experiments of 3-DOF Electromagnetic Spherical Actuators
Author: Liang Yan
Publisher: Springer Science & Business Media
Total Pages: 176
Release: 2011-06-06
Genre: Technology & Engineering
ISBN: 940071646X

A spherical actuator is a novel electric device that can achieve 2/3-DOF rotational motions in a single joint with electric power input. It has advantages such as compact structure, low mass/moment of inertia, fast response and non-singularities within the workspace. It has promising applications in robotics, automobile, manufacturing, medicine and aerospace industry. This is the first monograph that introduces the research on spherical actuators systematically. It broadens the scope of actuators from conventional single-axis to multi-axis, which will help both beginners and researchers to enhance their knowledge on electromagnetic actuators. Generic analytic modeling methods for magnetic field and torque output are developed, which can be applied to the development of other electromagnetic actuators. A parametric design methodology that allows fast analysis and design of spherical actuators for various applications is proposed. A novel non-contact high-precision 3-DOF spherical motion sensing methodology is developed and evaluated with experiments, which shows that it can achieve one order of magnitude higher precision than conventional methods. The technologies of nondimensionalization and normalization are introduced into magnetic field analysis the first time, and a benchmark database is established for the reference of other researches on spherical actuators.

Microbiorobotics

Microbiorobotics
Author: Minjun Kim
Publisher: William Andrew
Total Pages: 329
Release: 2012-03-08
Genre: Science
ISBN: 145577894X

Microbiorobotics is a new engineering discipline that inherently involves a multidisciplinary approach (mechanical engineering, cellular biology, mathematical modeling, control systems, synthetic biology, etc). Building robotics system in the micro scale is an engineering task that has resulted in many important applications, ranging from micromanufacturing techniques to cellular manipulation. However, it is also a very challenging engineering task. One of the reasons is because many engineering ideas and principles that are used in larger scales do not scale well to the micro-scale. For example, locomotion principles in a fluid do not function in the same way, and the use of rotational motors is impractical because of the difficulty of building of the required components. Microrobotics is an area that is acknowledged to have massive potential in applications from medicine to manufacturing. This book introduces an inter-disciplinary readership to the toolkit that micro-organisms offer to micro-engineering The design of robots, sensors and actuators faces a range of techology challenges at the micro-scale. This book shows how biological techniques and materials can be used to meet these challenges World-class multi-disciplanry editors and contributors leverage insights from engineering, mathematical modeling and the life sciences – creating a novel toolkit for microrobotics

Reduction of Dimensionality of a Cellular Actuator Array for Driving a Robotic Hand

Reduction of Dimensionality of a Cellular Actuator Array for Driving a Robotic Hand
Author: Kyu-Jin Cho (Ph. D.)
Publisher:
Total Pages: 117
Release: 2007
Genre:
ISBN:

In an attempt to explore an alternative to today's robot actuators, a new approach to artificial muscle actuator design and control is presented. The objective of this research is to coordinate the multitude of artificial muscle actuator axes for a large DOF (degree of freedom) robotic system based on dimensionality reduction. An array of SMA actuators is segmented into many independently controlled, spatially discrete volumes, each contributing a small displacement to create a large motion. Segmented Binary Control is proposed where each segment is controlled in an on-off manner, creating a stepper-motor like actuator. This overcomes hysteresis and other nonlinearities of the actuator material. The segmented cellular architecture of SMA wires is extended to a multi-axis actuator array by arranging the segments in a two-dimensional array. The multi-axis control is streamlined and coordinated using a grouping of segments called C-segments in order to activate multiple links of a robot mechanism in a coordinated manner. This allows control of large DOF with a small number of controls. The proposed approach is inspired by the segmented architecture of biological muscles and synergies, a strategy of grouping output variables to simplify the control of large number of muscles. Data from various hand postures are collected using data glove and used in creating the C-segment design that is capable of performing the given postures. A lightweight Robotic Hand with 16 DOF is built using shape memory alloy actuators. This hand weighs less than 1kg including 32 SMA actuators and control circuitry. Eight C-segments that are ON-off controlled are used to create sixteen given postures. In the future, this approach can be applied to applications where the control signal is inherently limited due to limited amount of information that can be extracted or transferred to the robot, such as brain machine interface and tele-operation.

Modeling and Control of Precision Actuators

Modeling and Control of Precision Actuators
Author: Tan Kok Kiong
Publisher: CRC Press
Total Pages: 272
Release: 2018-10-08
Genre: Science
ISBN: 1351832166

Modeling and Control of Precision Actuators explores new technologies that can ultimately be applied in a myriad of industries. It covers dynamical analysis of precise actuators and strategies of design for various control applications. The book addresses four main schemes: modeling and control of precise actuators; nonlinear control of precise actuators, including sliding mode control and neural network feedback control; fault detection and fault-tolerant control; and advanced air bearing control. It covers application issues in the modeling and control of precise actuators, providing several interesting case studies for more application-oriented readers. Introduces the driving forces behind precise actuators Describes nonlinear dynamics of precise actuators and their mathematical forms, including hysteresis, creep, friction, and force ripples Presents the control strategies for precise actuators based on Preisach model as well as creep dynamics Develops relay feedback techniques for identifying nonlinearities such as friction and force ripples Discusses a MPC approach based on piecewise affine models which emulate the frictional effects in the precise actuator Covers the concepts of air bearing stages with the corresponding control method Provides a set of schemes suitable for fault detection and accommodation control of mechanical systems Emphasizing design theory and control strategies, the book includes simulation and practical examples for each chapter; covers precise actuators such as piezo motors, coil motors, air bearing motors, and linear motors; discusses integration among different technologies; and includes three case studies in real projects. The book concludes by linking design methods and their applications, emphasizing the key issues involved and how to implement the precision motion control tasks in a practical system. It provides a concise and comprehensive source of the state-of-the-art developments and results for modeling and control of precise actuators.

Mathematical Modeling and Control of a Piezoelectric Cellular Actuator Exhibiting Quantization and Flexibility

Mathematical Modeling and Control of a Piezoelectric Cellular Actuator Exhibiting Quantization and Flexibility
Author: Joshua Andrew Schultz
Publisher:
Total Pages:
Release: 2012
Genre: Actuators
ISBN:

This thesis presents mathematical modeling and control techniques that can be used to predict and specify performance of biologically inspired actuation systems called cellular actuators. Cellular actuators are modular units designed to be connected in bundles in manner similar to human muscle fibers. They are characterized by inherent compliance and large numbers of on-off discrete control inputs. In this thesis, mathematical tools are developed that connect the performance to the physical manifestation of the device. A camera positioner inspired by the human eye is designed to demonstrate how these tools can be used to create an actuator with a useful force-displacement characteristic. Finally, control architectures are presented that use discrete switching inputs to produce smooth motion of these systems despite an innate tendency toward oscillation. These are demonstrated in simulation and experiment.