DOCSLIB.ORG

On the Use of Aerogel As a Soft Acoustic Metamaterial for Airborne Sound

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
On the Use of Aerogel As a Soft Acoustic Metamaterial for Airborne Sound On the use of aerogel as a soft acoustic metamaterial for airborne sound Matthew D. Guild,∗ Victor M. Garc´ıa-Chocano, and Jos´eS´anchez-Dehesay Wave Phenomena Group, Departamento de Ingenier´ıa Electr´onica, Universidad Polit´ecnica de Valencia, Camino de vera s/n (Edificio 7F), E-46022 Valencia, Spain Theodore P. Martin, David C. Calvo, and Gregory J. Orris U.S. Naval Research Laboratory, Code 7160, Washington DC 20375, USA (Dated: August 16, 2016) Soft acoustic metamaterials utilizing mesoporous structures have recently been proposed as a novel means for tuning the overall effective properties of the metamaterial and providing better coupling to the surrounding air. In this work, the use of silica aerogel is examined theoretically and experimentally as part of a compact soft acoustic metamaterial structure, which enables a wide range of exotic effective macroscopic properties to be demonstrated, including negative density, density- near-zero and non-resonant broadband slow sound propagation. Experimental data is obtained on the effective density and sound speed using an air-filled acoustic impedance tube for flexural metamaterial elements, which have previously only been investigated indirectly due to the large contrast in acoustic impedance compared to that of air. Experimental results are presented for silica aerogel arranged in parallel with either 1 or 2 acoustic ports, and are in very good agreement with the theoretical model. PACS numbers: 43.20.+g, 43.28.+h, 43.58.+z Keywords: acoustic metamaterials, silica aerogels, negative dynamical density, slow sound I. INTRODUCTION and exciting phenomena associated with effective proper- ties that are near zero, particularly those associated with Acoustic metamaterials have received interest in re- extraordinary transmission, which can be achieved when cent years by enabling macroscopic physical characteris- either the effective density or wave speed approaches tics which cannot be obtained with traditional materials, zero[4, 5]. In the case of a density-near-zero material, such as negative, near-zero or anisotropic dynamic ef- the effective wave speed increases dramatically and leads fective fluid properties. Acoustic metamaterials are able to a quasi-static field within a given structure, which to achieve such previously unattainable exotic properties can exhibit a supercoupling effect through long narrow through the careful design of the microstructure, which channels[6{8]. At the opposite extreme, there are also in- create microscale dynamics that result in the desired teresting effects which arise as the effective acoustic wave macroscopic properties. The reader is addressed to the speed approaches zero, which is referred to as slow sound, recent reviews on this topic where one can find many of the analogue of slow light in optics. Previous demonstra- the exciting applications of acoustic metamaterials[1, 2]. tions have utilized resonant effects using either sonic crys- Until recently, such acoustic metamaterials have relied tals or detuned resonators[9{11], resulting in slow sound on materials which are much harder than the surround- that occurs over a relatively narrow bandwidth. A novel ing fluid medium, often treated as acoustically rigid or application of slow sound propagation was recently pro- nearly-rigid structures for airborne sound. Alternatively, posed for the improved design of acoustic absorbers by soft acoustic metamaterials utilizing mesoporous struc- Groby et al.[12], in which slow sound in large slits filled tures have been proposed as a novel means for the mold- with absorptive foam were used to significantly increase ing and tuning of the overall properties of the resulting the low frequency absorption in air. metamaterial, while simultaneously providing better cou- One of the fundamental aspects that gives a meta- pling with the acoustic environment around it [3]. Build- material its exotic macroscopic properties is the ho- ing upon this concept, the use of silica aerogel as part mogenization of the microstructure, which has recently of a compact and conformal soft acoustic metamaterial been explored for elastic and flexural metamaterial structure is examined theoretically and experimentally, components[13, 14]. This is particularly important be- arXiv:1509.08378v1 [cond-mat.mtrl-sci] 28 Sep 2015 yielding an interesting suite of useful yet exotic proper- cause the effective macroscopic properties of an acoustic ties. metamaterial can be significantly different than those of In addition to extremely large and/or negative dy- the constituent microstructural elements. When there is namic properties, there are a wide range of interesting open flow through the structure, such as a sonic crys- tal lattice[15, 16] or transmission-line arrangement of Helmholtz resonators [17], it is relatively straightforward ∗ [email protected]; Current address: NRC Re- to extract effective properties experimentally due to the search Associateship Program, U.S. Naval Research Laboratory, relatively low acoustic impedance. Code 7160, Washington DC 20375, USA A formidable challenge, however, arises when obtain- y [email protected] ing the effective properties of a metamaterial sample con- 2 taining elastic elements, which have acoustic impedances are made possible by its unique microstructure. One that are orders of magnitude greater than the surround- of the most common types of aerogels, silica aerogel, ing fluid and at frequencies well below those typically consists of a high-porosity frame made of fused silica used to obtain acoustic properties through direct time- nanoparticles. The most notable characteristic of sil- of-flight measurements. As a result, previous works in ica aerogel is its extremely low static density which is air have either been restricted to theoretical and nu- directly related to the very high porosity of the struc- merical evaluation[4, 7, 18{20] or limited to an indirect ture, making it much closer to that of air compared with comparison of the metamaterial properties using experi- any other type of elastic solid. Due to the nanoscale mental results for the reflected and transmitted pressure pore size, however, the air is locked in place by vis- field[5, 21]. In this work we make the significant step cous effects producing a higher acoustic density than of experimentally extracting the effective dynamic prop- that compared to typical porous media used in acous- erties (density and sound speed) of these flexural meta- tic applications[26]. Furthermore, the small cross-section material elements, which has to the authors knowledge connecting the fused nanoparticles results in a very low never been accomplished previously for such a metama- elastic stiffness, compared with a rigid silica structure terial structure in air. of the same porosity[27]. This combination gives a rela- It is expected that the elasticity of the materials defin- tively low acoustic impedance (for an elastic solid), and ing the metamaterial structure might play a fundamental in particular yields an exceptionally low flexural wave role in order to understand the phenomena observed in speed, making it ideal for use as a subwavelength flexu- sound transmission and reflectance through the channels ral element for airborne sound. defined by the structure. In fact, the role of the elastic When the wavelength is much larger than the mi- properties is paramount for the case of structures embed- crostructure, negative effective properties are achieved ded in water, as it has been recently demonstrated [22]. via control of the microstructure arrangement and the Although some recent work has begun to incorporate the resulting dynamics. This feature in the microstructure elastic effects into the metamaterial structure, many of design is typically achieved with two main types of ar- these designs continue to have the primary dynamic ele- rangements: either as a mass-spring system, or in a ment consisting of mass-spring resonators which are af- transmission-line consisting of mass and stiffness ele- fixed to an elastic plate as structural support[19, 20]. ments. The mass-spring systems, which demonstrate ex- Alternatively, soft acoustic metamaterials represent a treme effective mass and stiffness in the vicinity of the paradigm shift beyond this framework by creating the mass-spring resonance, are therefore referred to as lo- dynamics from the structure itself. It is important to cally resonant acoustic metamaterials (LRAMs) [5, 28{ emphasize that such a soft acoustic metamaterial, real- 32]. Although such mass and spring elements can be ized with the unique properties of aerogels, can be tai- arranged in a compact configuration and are relatively lored to obtain a wide spectrum of desirable exotic prop- simple and robust, the resulting extreme effective prop- erties in a single versatile subwavelength acoustic meta- erties are inherently narrowband and subject to appre- material element. In this work, theoretical and experi- ciable loss due to the close proximity of the mass-spring mental results for a compact metamaterial configuration resonance[8, 33]. Alternatively, acoustic metamaterials are presented, enabling a thin, conformal configuration have been proposed using thin elastic plates as a means to be realized. In particular, these structures represent for operating as a positive stiffness element in acous- a soft acoustic metamaterial, which are realized using tic transmission-line arrangements [18], which has re- the flexural resonance of the zeroth-order anti-symmetric cently been applied to acoustic metamaterial leaky-wave
Load more

Recommended publications
  • Aerogel Background Slides
    Aerogels Background Information Version 052917.1 Overview The following slides present background information on aerogel and its role in nanotechnology. They may be presented as part of a lecture introducing the Aerogel activity. Aerogel’s nickname: “Solid blue smoke” Aerogel resembles a hologram. Is it there or not? Aerogel is a highly porous, solid material. Aerogel has the lowest density of any solid known to man. It is one thousand times less dense than glass. NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California Aerogel is a Product of Nanotechnology Aerogels are made of 10nm silica spheres. They weigh only slightly more than air. In fact, one form is 99.8% air. About 8,000 of these air Scanning electron microscope image of aerogel bubbles would fit across a single human hair Why is Aerogel Blue? The size of the air bubbles is similar in size to the molecules in air and the air pockets in glaciers. They all scatter blue light more than red, making them look blue. NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California Gray Glacier, Torres del Paine National Park Chile How is Aerogel Made? • Labs make aerogels by suspending silicon dioxide in alcohol and water to form a gel. • The liquid is removed with carbon dioxide under high pressure and temperature. • Aerogels are expensive to make. Extreme Physical Properties of Aerogel Property Silica Aerogel Silica Glass Density (kgm3) 5-200 2300 Specific Surface area 500-800 0.1 (m2/g) Optical Transmission 90% 99% at 632.8nm
    [Show full text]
  • Aerogel Fact Sheet
    The NASA Vision The NASA Mission To improve life here, To understand and protect our home planet, To extend life to there, To explore the universe and search for life, To find life beyond To inspire the next generation of explorers Aerogel ...as only NASA can Mystifying Blue Smoke At first sight, aerogel resembles a hologram. An JPL’s second application of aerogel is spacecraft in- excellent insulator, aerogel has the lowest density sulation. Because aerogel is mostly air, an effective Property Silica Aerogel Silica Glass of any known solid — one form of this extraordi- thermal insulator is contained within its porous nary substance is actually 99.8 percent air and silica network. This presents an excellent thermal Density (kgm3) 5 – 200 2300 0.2 percent silica dioxide (by volume). Aerogels barrier to protect the spacecraft against the ex- Specific Surface Area 500 – 800 0.1 have open-pore structures similar to honeycomb, treme cold of deep space. The Mars Pathfinder (m2/g) but in fact they are low-density, solid materials mission used aerogel to protect the electronics Refractive Index at with extremely fine microstructures. Typically sili- of the Sojourner rover against the frigid Martian 1.002 – 1.046 1.514 – 1.644 632.8 nm con-based like ordinary glass, or carbon-based like environment during Sojourner’s 1997 travels on common organic synthetics, aerogels possess the red planet. Each of the twin Mars Exploration Optical unique physical properties (see table). The unique Rovers, scheduled to land on Mars in early 2004, Transmittance 90% 99% characteristics of aerogels are being applied to employs aerogel for thermal insulation of the bat- at 632.8 nm tery, electronics, and computer in the chassis, or meet new technological demands.
    [Show full text]
  • Investigation of Carbon Nanotube Grafted Graphene Oxide Hybrid Aerogel for Polystyrene Composites with Reinforced Mechanical Performance
    polymers Article Investigation of Carbon Nanotube Grafted Graphene Oxide Hybrid Aerogel for Polystyrene Composites with Reinforced Mechanical Performance Yanzeng Sun †, Hui Xu †, Zetian Zhao, Lina Zhang, Lichun Ma, Guozheng Zhao, Guojun Song * and Xiaoru Li * Institute of Polymer Materials, School of Material Science and Engineering, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China; [email protected] (Y.S.); [email protected] (H.X.); [email protected] (Z.Z.); [email protected] (L.Z.); [email protected] (L.M.); [email protected] (G.Z.) * Correspondence: [email protected] (G.S.); [email protected] (X.L.) † Yanzeng Sun and Hui Xu are co-first authors. Abstract: The rational design of carbon nanomaterials-reinforced polymer matrix composites based on the excellent properties of three-dimensional porous materials still remains a significant challenge. Herein, a novel approach is developed for preparing large-scale 3D carbon nanotubes (CNTs) and graphene oxide (GO) aerogel (GO-CNTA) by direct grafting of CNTs onto GO. Following this, styrene was backfilled into the prepared aerogel and polymerized in situ to form GO–CNTA/polystyrene (PS) nanocomposites. The results of X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy indicate the successful establishment of CNTs and GO-CNT and the excellent mechanical properties of the 3D frameworks using GO-CNT aerogel. The nanocomposite fabricated with around 1.0 wt% GO- CNT aerogel displayed excellent thermal conductivity of 0.127 W/m·K and its mechanical properties Citation: Sun, Y.; Xu, H.; Zhao, Z.; Zhang, L.; Ma, L.; Zhao, G.; Song, G.; were significantly enhanced compared with pristine PS, with its tensile, flexural, and compressive Li, X.
    [Show full text]
  • Large Tunability in the Mechanical and Thermal Properties of Carbon Nanotube-Fullerene Hierarchical Monoliths
    Nanoscale Large tunability in the mechanical and thermal properties of carbon nanotube-fullerene hierarchical monoliths Journal: Nanoscale Manuscript ID NR-COM-08-2018-006848.R3 Article Type: Communication Date Submitted by the 16-Nov-2018 Author: Complete List of Authors: Giri, Ashutosh; University of Virginia, Tomko, John; University of Virginia, Mechanical and Aerospace Engineering Gaskins, John; University of Virginia, Hopkins, Patrick; University of Virginia, Page 1 of 7 Nanoscale Large tunability in the mechanical and thermal properties of carbon nanotube-fullerene hierarchical monoliths† Ashutosh Giri,∗a John Tomko,b‡ John T. Gaskins,a and Patrick E. Hopkinsab‡a† Carbon based materials have attracted much attention as 1 building blocks in technologically relevant nanocomposites wards the design and fabrication of novel nanomaterials. Car- due to their unique chemical and physical properties. Here, bon based materials are promising candidates as building blocks we propose a new class of hierarchical carbon based nano- for “bottom-up” approaches in hierarchical material systems due truss structures consisting of fullerene joints attached with to their different allotropes and the ability to form a wide range of 2–5 carbon nanotubes as the truss forming a three-dimensional geometries. Along with the aforementioned qualities, and the network. Atomistic molecular dynamics simulations allow added advantage of scalability, these materials can potentially of- us to systematically demonstrate the ability to simulta- fer large tunability in their physical and chemical properties with 6–8 neously control the mechanical and thermal properties novel and systematic design of their microstructure. Among of these structures, elucidating their unique physical the various allotropes are carbon nanotube (CNT) structures with properties.
    [Show full text]
  • Lunar Rover with Multiple Science Payload Handling Capability
    Lunar Rover with Multiple Science Payload Handling Capability Aravind Seeni, Research Engineer, Institute of Robotics and Mechatronics, German Aerospace Center, 82234 Wessling, Germany. [email protected] Bernd Schäfer, Project Manager, Institute of Robotics and Mechatronics, German Aerospace Center, 82234 Wessling, Germany. [email protected] Bernhard Rebele, Research Engineer, Institute of Robotics and Mechatronics, German Aerospace Center, 82234 Wessling, Germany. [email protected] Rainer Krenn, Research Engineer, Institute of Robotics and Mechatronics, German Aerospace Center, 82234 Wessling, Germany. [email protected] A rover design study was undertaken for exploration of the Moon. Rovers that have been launched in the past carried a suite of science payload either onboard its body or on the robotic arm’s end. No rover has so far been launched and tasked with “carrying and deploying” a payload on an extraterrestrial surface. This paper describes a lunar rover designed for deploying payload as well as carrying a suite of instruments onboard for conventional science tasks. The main consideration during the rover design process was the usage of existing, in-house technology for development of some rover systems. The manipulation subsystem design was derived from the technology of Light Weight Robot, a dexterous arm originally developed for terrestrial applications. Recent efforts have led to definition of a mission architecture for exploration of the Moon with such a rover. An outline of its design, the manipulating arm technology and the design decisions that were made has been presented. performing experiments on interesting locations after 1. INTRODUCTION landing with the available rover science instruments and tools.
    [Show full text]
  • Nanomaterials in Advanced, High-Performance Aerogel Composites: a Review
    polymers Review Nanomaterials in Advanced, High-Performance Aerogel Composites: A Review Elizabeth Barrios 1,2 , David Fox 1,3, Yuen Yee Li Sip 1, Ruginn Catarata 1, Jean E. Calderon 1, Nilab Azim 1,3 , Sajia Afrin 1,3, Zeyang Zhang 3 and Lei Zhai 1,2,3,* 1 NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA; [email protected] (E.B.); [email protected] (D.F.); [email protected] (Y.Y.L.S.); [email protected] (R.C.); [email protected] (J.E.C.); [email protected] (N.A.); [email protected] (S.A.) 2 Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA 3 Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA; [email protected] * Correspondence: [email protected]; Tel.: +01-407-882-2847 Received: 17 March 2019; Accepted: 16 April 2019; Published: 20 April 2019 Abstract: Aerogels are one of the most interesting materials of the 21st century owing to their high porosity, low density, and large available surface area. Historically, aerogels have been used for highly efficient insulation and niche applications, such as interstellar particle capture. Recently, aerogels have made their way into the composite universe. By coupling nanomaterial with a variety of matrix materials, lightweight, high-performance composite aerogels have been developed for applications ranging from lithium-ion batteries to tissue engineering materials. In this paper, the current status of aerogel composites based on nanomaterials is reviewed and their application in environmental remediation, energy storage, controlled drug delivery, tissue engineering, and biosensing are discussed.
    [Show full text]
  • Observation of a New Superfluid Phase for 3He Embedded in Nematically Ordered Aerogel
    ARTICLE Received 7 Jun 2016 | Accepted 23 Aug 2016 | Published 27 Sep 2016 DOI: 10.1038/ncomms12975 OPEN Observation of a new superfluid phase for 3He embedded in nematically ordered aerogel N. Zhelev1, M. Reichl1, T.S. Abhilash1, E.N. Smith1, K.X. Nguyen2, E.J. Mueller1 & J.M. Parpia1 In bulk superfluid 3He at zero magnetic field, two phases emerge with the B-phase stable everywhere except at high pressures and temperatures, where the A-phase is favoured. Aerogels with nanostructure smaller than the superfluid coherence length are the only means to introduce disorder into the superfluid. Here we use a torsion pendulum to study 3He confined in an extremely anisotropic, nematically ordered aerogel consisting of B10 nm-thick alumina strands, spaced by B100 nm, and aligned parallel to the pendulum axis. Kinks in the development of the superfluid fraction (at various pressures) as the temperature is varied correspond to phase transitions. Two such transitions are seen in the superfluid state, and we identify the superfluid phase closest to Tc at low pressure as the polar state, a phase that is not seen in bulk 3He. 1 Department of Physics and Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA. 2 School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA. Correspondence and requests for materials should be addressed to J.M.P. (email: [email protected]). NATURE COMMUNICATIONS | 7:12975 | DOI: 10.1038/ncomms12975 | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | DOI: 10.1038/ncomms12975 uperfluid 3He is our best example of a quantum system, estimate that the aerogel consists of B10 nm-thick strands, where the fermionic constituents form Cooper pairs spaced B100 nm apart.
    [Show full text]
  • Acoustic Spectroscopy of Superfluid 3He in Aerogel
    Acoustic Spectroscopy of Superfluid 3He in Aerogel J.P. Davis, H. Choi, J. Pollanen, and W.P. Halperin Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA Abstract: We have designed an experiment to study the role of global anisotropic quasiparticle scattering on the dirty aerogel superfluid 3He system. We observe significant regions of two stable phases at temperatures below the superfluid transition at a pressure of 25 bar for a 98% aerogel. Keywords: Superfluidity, Helium 3, Aerogel PACS: 67.57.Pq, 67.57.Bc, 64.60.My INTRODUCTION proportional to the difference in the heat capacity jumps. Ultrasonic spectroscopy has proven to be a powerful tool in the study of 3He. The acoustic Sauls also noted [6] that large length scale impedance for transverse sound exhibits anomalies at correlations, or global anisotropy, in the aerogel might phase transitions that mark the superfluid phase also favor phases with the orbital wavefunction diagram of 3He in 98% porosity silica aerogel [1]. The perpendicular to the anisotropy axis, namely the planar scattering of 3He quasiparticles from the silica aerogel or axial phases. strands suppresses Tc and stabilizes the B-phase. An A-like phase is found to be metastable in zero field with large supercooling [1]. This is consistent with EXPERIMENT NMR [2] and low-frequency sound velocity measurements [3]. In order to study the role of anisotropy, one needs a probe that is both directional and extremely sensitive More recent acoustic tracking experiments by to phase transitions in the 3He. Transverse acoustic Vicente et al. [4] and NMR by Osheroff et al.
    [Show full text]
  • 3D Printing Quarterly Report—Q32018 3D PRINTING–A FAST MOVING MARKET Developments in 3D Printing a Sector by Sector Overview
    3D Printing Quarterly Report—Q32018 3D PRINTING–A FAST MOVING MARKET Developments in 3D Printing A Sector by Sector Overview Overview This report explores developments in 3D printing across several sectors and categories for the quarterly period of July 1 to October 10, 2018. For more information, Table of Contents please contact: Overview ................................... 2 Patents & Copyright ................. 12 Food ....................................... 21 Mark E. Avsec General ..................................... 2 Auto & Transportation ............... 12 Consumer Goods & Retail ......... 22 (216) 363-4151 Materials ................................... 4 Aviation & Aerospace ............... 13 Education ................................ 23 [email protected] Printing Techniques & Health & Life Sciences ............. 14 Environmental Efforts ............... 24 Capabilities .............................. 5 Manufacturing & Construction... 17 Arts & Entertainment ................ 25 M&A and Investments ................ 9 Clothing & Wearables ............... 20 Sports ..................................... 25 www.beneschlaw.com Miscellaneous Partnerships ...... 11 3D PRINTING–A FAST MOVING MARKET 3D Printing Quarterly Report—Q3 A Sector by Sector Overview General Aurora Group to market Nano Dimension 3D printers in China The deal expands Nano Dimension’s already active presence in Asia Pacific beyond Hong Kong, South Korea, Singapore and Taiwan. Founded in 2012, Nano Dimensions develops and manufactures 3D printers for the electronics
    [Show full text]
  • Thermal Control Architecture for a Planetary and Lunar Surface Exploration Micro-Robot
    Thermal Control Architecture for a Planetary and Lunar Surface Exploration Micro-Robot Brian R. Burg1, Steven Dubowsky2a, John H. Lienhard V2b, and Dimos Poulikakos1 1Laboratory for Thermodynamics in Emerging Technologies, Eigenössische Technische Hochschule Zürich (ETH), 8092 Zurich, Switzerland 2aField and Space Robotics Laboratory, and 2bW. M. Rohsenow Heat and Mass Transfer Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA +41 44 632 3996, [email protected] Abstract. A thermal control architecture design study is conducted for a novel robotic planetary and lunar surface exploration concept. The concept is based on the deployment of a large number of small spherical mobile robots over large areas, which employ hopping, bouncing and rolling as means of locomotion. The aim of the research is to prevent freezing and overheating of the robots, without compromising their mechanical and thermal reliability and stability. The proposed thermal control architecture relies on a low emissive silver surface coating and a low conductive silica aerogel insulation layer. This enables a single design to be used for several important potential explorations. The effects of a thermal control heat rejection mechanism, composed of a variable emittance coating and heat switch, are also studied in order to increase mission flexibility. Keywords: Thermal design, thermal control, micro-robot, variable emittance coating, heat switch, space technology. PACS: 89.20.Kk. INTRODUCTION A new concept for planetary exploration, based on the deployment of a large number (hundreds to thousands) of small spherical mobile robots over large areas of a planet or moon’s surface and subsurface, is being investigated by Dubowsky et al.
    [Show full text]
  • The Shapeshifter: a Morphing, Multi-Agent, Multi-Modal Robotic Platform for the Exploration of Titan
    Final Report NASA NIAC Phase I Study The Shapeshifter: a Morphing, Multi-Agent, Multi-Modal Robotic Platform for the Exploration of Titan Prepared for Mr. Jason Derleth Program Executive, NASA Innovative Advanced Concepts Program Submitted May 31, 2019 Submitted by: Dr. Ali-akbar Agha-mohammadi, PI Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr, Pasadena, CA 91109 Phone: (626) 840-9140 Email: [email protected] Andrea Tagliabue Stephanie Schneider Dr. Benjamin Morrell Jet Propulsion Laboratory Dep. of Aeronautics and Jet Propulsion Laboratory California Institute of Astronautics California Institute of Technology Stanford University Technology [email protected] [email protected] [email protected] Prof. Marco Pavone, Co-I Dr. Jason Hofgartner, Co-I Dr. Issa A.D. Nesnas, Co-I Dep. of Aeronautics and Jet Propulsion Laboratory Jet Propulsion Laboratory Astronautics California Institute of California Institute of Stanford University Technology Technology [email protected] [email protected] [email protected] Kalind Carpenter, Co-I Dr. Rashied B. Amini, Co-I Dr. Arash Kalantari Jet Propulsion Laboratory Jet Propulsion Laboratory Jet Propulsion Laboratory California Institute of California Institute of California Institute of Technology Technology Technology [email protected] [email protected] [email protected] Dr. Alessandra Babuscia Dr. Javid Bayandor Prof. Jonathan Lunine Jet Propulsion Laboratory School of Engineering and Dep. of Astronomy California Institute of Applied Sciences Cornell University Technology University at Buffalo [email protected] [email protected] bayandor@buffalo.edu c 2019 California Institute of Technology. Partial Government sponsorship acknowledged.
    [Show full text]
  • Innovating the Construction Sector
    International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 01 | Jan 2019 www.irjet.net p-ISSN: 2395-0072 Innovating the Construction Sector Siddhant Vora1, Anshul Bansal2 1B.Tech, Mechatronics Engineering, Manipal Institute of Technology 2B.Tech, Civil Engineering, Manipal Institute of Technology ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract – The construction sector for long has been countries analyzed over the past years, less than one- considered to be a laggard in terms of productivity and its quarter of construction firms have matched the ability to suffice the ever increasing needs of our developing productivity growth achieved by the overall world. Although it remains to be among the sectors that has economies in which they function the maximum potential for development, the pace of growth is 4) A dated survey by the United Nations estimated that stunted. The call of the day is to invest skills and technology over 100 million people are homeless worldwide. A into the sector in order to pillar the foundation of a growth major cause of this is techniques of construction and story that is both commercially scalable and futuristic in material not suiting the economies of scale. nature. The intention of this paper is to shed light on two Technology and scientific research can open up vast pivotal factors that are the legs of this industry: a) material potentials of viable development here and b) technology. While the study of material has always 5) Labor safety, ergonomics of construction and been unparalleled in terms of innovation, its application in our environmental impact are troubling issues that have everyday lives is often underutilized.
    [Show full text]