Investigation on Damping of a Host Structure Induced by Attached Cables

2014 ◽  
pp. 269-281
Author(s):  
Jiduck Choi ◽  
Daniel J. Inman
Keyword(s):  
Host Structure

Effects of the Crystal Host Structure on the Oxygen Desorption Behavior in Perovskite-Type AeFe0.9In0.1O3−δ (Ae = Sr and Ba)

2021 ◽  
Author(s):  
Fumito Fujishiro ◽  
Chinatsu Sasaoka ◽  
Toshiaki Ina ◽  
Tokio Sakuragi ◽  
Masatsugu Oishi
Keyword(s):  
Oxygen Desorption ◽  
Host Structure ◽  
Perovskite Type

Nanometer-Scale Composite Structures Formed by Simultaneous Oblique Sputter-Deposition of Two Materials from Different Directions

1990 ◽  
Vol 206 ◽  
Author(s):  
Tomoyoshi Motohiro ◽  
Yasuhiko Takeda ◽  
Yoshihide Watanabe ◽  
Shoji Noda
Keyword(s):  
Composite Structures ◽  
Polar Angle ◽  
Sputter Deposition ◽  
Nanometer Scale ◽  
Metal Insulator ◽  
Host Materials ◽  
Oblique Deposition ◽  
Host Structure ◽  
Optical Applications ◽  
Nonlinear Optical Applications

ABSTRACTOblique depositlon(OD) provides an attractive anisotropic structure In nm-scale as a promising host structure to form anisotropic nm-scale composites(ANSC). Among a variety of possible methods to introduce a guest material Into the host structure of OD, we have attempted simultaneous oblique deposition of a guest and a host material from two different directions. The computer simulation for ballistic deposition, which had greatly contributed to the understanding of the morphology evolution in OD, has been carried out again here to design possible ANSC structures and to survey their variations. A typical ANSC structure obtained here is a composite of slender clusters of the guest and the host materials, which can be regarded as an anisotropic version of the well-known isotropic structures of the metal-insulator or semiconductor-insulator cermets for magneto-optical or nonlinear optical applications. This appears when the host and the guest materials are deposited from the directions of the same polar angle of 70° but from the reverse azimuthal directions. In accordance with this result, a specially designed sputtering apparatus has been constructed. Structures and optical anisotropy of the films of several composites' systems such as ZnTe-SiO2 and Cu-SiO2 formed by this apparatus have indicated that our attempt has hit the mark.

Cathodic Protection Design Consideration for an Offshore Flexible Riser Connected to an Impressed Current System

2021 ◽  
Author(s):  
Thierry Dequin ◽  
Clark Weldon ◽  
Matthew Hense
Keyword(s):  
Cathodic Protection ◽  
Sacrificial Anode ◽  
Flexible Riser ◽  
Flexible Pipe ◽  
Linear Resistance ◽  
Flexible Pipes ◽  
Flexible Risers ◽  
Impressed Current ◽  
Host Structure ◽  
Impressed Current Cathodic Protection

Abstract Flexible risers are regularly used to produce oil and gas in subsea production systems and by nature interconnect the subsea production system to the floating or fixed host facilities. Unbonded flexible pipes are made of a combination of metallic and non-metallic layers, each layer being individually terminated at each extremity by complex end fittings. Mostly submerged in seawater, the metallic parts require careful material selection and cathodic protection (CP) to survive the expected service life. Design engineers must determine whether the flexible pipe risers should be electrically connected to the host in order to receive cathodic protection current or be electrically isolated. If the host structure is equipped with a sacrificial anode system, then electrical continuity between the riser and the host structure is generally preferred. The exception is often when the riser and host structure are operated by separate organizations, in which case electrical isolation may be preferred simply to provide delineation of ownership between the two CP systems. The paper discusses these interface issues between hull and subsea where the hull is equipped with an impressed current cathodic protection (ICCP) system, and provides guidance for addressing them during flexible pipe CP design, operation, and monitoring. Specifically, CP design philosophies for flexible risers will be addressed with respect to manufacturing, installation and interface with the host structure’s Impressed Current Cathodic Protection (ICCP) system. The discussion will emphasize the importance of early coordination between the host structure ICCP system designers and the subsea SACP system designers, and will include recommendations for CP system computer modeling, CP system design operation and CP system monitoring. One of the challenges is to understand what to consider for the exposed surfaces in the flexible pipes and its multiple layers, and also the evaluation of the linear resistance of each riser segment. The linear resistance of the riser is a major determinant with respect to potential attenuation, which in turn largely determines the extent of current drain between the subsea sacrificial anode system and the hull ICCP system. To model the flexible riser CP system behavior for self-protection, linear resistance may be maximized, however the use of a realistic linear resistance is recommended for evaluation of the interaction between the host structure and subsea system. Realistic flexible linear resistance would also reduce conservatism in the CP design, potentially save time during the offshore campaign by reducing anode quantities, and also providing correct evaluation of drain current and stray currents.

Host Structure

2017 ◽  
pp. 179-190
Author(s):  
Adrian Perrig ◽  
Pawel Szalachowski ◽  
Raphael M. Reischuk ◽  
Laurent Chuat
Keyword(s):  
Host Structure

Applications of the Impedance Method on Multiple Piezoelectric Actuators Driven Structures

2000 ◽  
Vol 123 (2) ◽  
pp. 262-268 ◽  
Author(s):  
C. C. Cheng ◽  
P. W. Wang
Keyword(s):  
System Modeling ◽  
Excitation Frequency ◽  
Vibration Response ◽  
Impedance Method ◽  
Dynamic Interactions ◽  
Active Structure ◽  
Impedance Model ◽  
Proposed Model ◽  
Host Structure ◽  
Arbitrary Location

An impedance-based system modeling technique has been developed to determine the output forces of multiple piezoelectric (PZT) patch actuators on an active structure to produce a known vibration response. In the analysis of the dynamic response of a structure driven by multiple PZT patches, the proposed model includes not only the dynamic interactions between the PZT patch and the host structure but also the impedance couplings among PZT patches. Therefore this approach can apply to a structure with multiple PZT actuators. Furthermore, the bending stiffness and the thickness of a PZT patch that are proved to be important as increases of excitation frequency are included in the proposed impedance model. Examples are given to demonstrate how to synthesize a known vibration response and how to suppress vibration response at an arbitrary location on structures using this technique.

K3Sb7IIIO9Se3· 3 H2O: The First Crystalline Nanoporous Material with a Photo-Semiconducting Host Structure

1997 ◽  
Vol 36 (10) ◽  
pp. 1121-1124 ◽  
Author(s):  
Ulrich Simon ◽  
Ferdi Schüth ◽  
Stephan Schunk ◽  
Xiqu Wang ◽  
Friedrich Liebau
Keyword(s):  
Nanoporous Material ◽  
Host Structure

Embedded Metamaterial Subframe Patch for Increased Power Output of Piezoelectric Energy Harvesters

2021 ◽  
pp. 1-9
Author(s):  
Saman Farhangdoust ◽  
Gary Georgeson ◽  
Jeong-Beom Ihn ◽  
Armin Mehrabi
Keyword(s):  
Energy Harvesting ◽  
Cantilever Beam ◽  
Renewable Energy Sources ◽  
Piezoelectric Element ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Harvesting Systems ◽  
Host Structure ◽  
Self Powered ◽  
Low Efficiency

Abstract These days, piezoelectric energy harvesting (PEH) is introduced as one of the clean and renewable energy sources for powering the self-powered sensors utilized for wireless condition monitoring of structures. However, low efficiency is the biggest drawback of the PEHs. This paper introduces an innovative embedded metamaterial subframe (MetaSub) patch as a practical solution to address the low throughput limitation of conventional PEHs whose host structure has already been constructed or installed. To evaluate the performance of the embedded MetaSub patch (EMSP), a cantilever beam is considered as the host structure in this study. The EMSP transfers the auxetic behavior to the piezoelectric element (PZT) wherever substituting a regular beam with an auxetic beam is either impracticable or suboptimal. The concept of the EMSP is numerically validated, and the COMSOL Multiphysics software was employed to investigate its performance when a cantilever beam is subjected to different amplitude and frequency. The FEM results demonstrate that the harvesting power in cases that use the EMSP can be amplified up to 5.5 times compared to a piezoelectric cantilever energy harvester without patch. This paper opens up a great potential of using EMSP for different types of energy harvesting systems in biomedical, acoustics, civil, electrical, aerospace, and mechanical engineering applications.

Fatigue Response of a Host Structure with Interlaced Embedded Devices

2000 ◽  
Vol 11 (11) ◽  
pp. 902-909
Author(s):  
John P. Hansen ◽  
Anthony J. Vizzini
Keyword(s):  
Embedded Devices ◽  
Damage Initiation ◽  
Glass Slides ◽  
Host Structure ◽  
Laminate Thickness

A structural tailoring technique known as interlacing was applied to [0°]24T graphite/epoxy specimens. Glass slides, representing inert actuators or sensors, were embedded using three different interlacing configurations that are defined by the location of the continuous and discontinuous plies through the laminate thickness. Twenty specimens were loaded in tension-tension fatigue and inspected at regular intervals to monitor damage initiation and progression. The results of this research demonstrated that the onset of damage can be delayed and the progression of delamination can be impeded by distributing the material discontinuity of the inclusion through the thickness via interlacing.

Acoustic Response Synthesis Using Multiple Induced-Strain Actuators

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
C. C. Lin ◽  
C. C. Cheng
Keyword(s):  
Inverse Problem ◽  
Dynamic Model ◽  
Acoustic Impedance ◽  
Accurate Prediction ◽  
Impedance Method ◽  
Structural Acoustics ◽  
Acoustic Response ◽  
Proposed Model ◽  
Host Structure ◽  
Multiple Actuators

A methodology to synthesize a predesignated acoustic response using a structure driven by multiple induced-strain actuators, e.g., piezoelectric (PZT) patches, is presented. The proposed approach of solving the inverse problem of structural acoustics, e.g., how to produce a known acoustic response from a given PZT-driven baffled plate, is accomplished using the impedance method. A dynamic model that assembles the PZT patch impedance, the host structure impedance, and the acoustic impedance is developed and then is utilized to synthesize a predesignated acoustic response. The proposed model includes the mass and stiffness of the actuator and thus provides a more accurate prediction when a structure is bonded with multiple actuators.

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