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检索条件"任意字段=Conference on Active and Passive Smart Structures and Integrated Systems IX"

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Comparison of semi-active damping strategies for magnetorheological sandwich beams 17

Comparison of semi-active damping strategies for magnetorheo...

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conference on active and passive smart structures and integrated systems XVII

作者： Vazquez, Christian G. Ortega, Juan J. Kauffman, Jeffrey L. Univ Cent Florida Dept Mech & Aerosp Engn 4000 Cent Florida Blvd Orlando FL 32816 USA

ISBN: (纸本)9781510660731;9781510660748

The purpose of this research is to measure the free-decay dynamics of a magnetorheological (MR) sandwich beam when influenced by a semi-active magnetic field and comparing the resulting damping performance to those of baseline fields. The research effort involved an experiment where the beam freely decayed while in a magnetic field that influences the MR sandwich beam, altering its damping performance. In addition to baseline cases of no magnetic field or a constant field, the electromagnet also had a field that would shut off after a set time and a field that would switch between a high and low field strength at a certain frequency. These results were also recreated numerically, which required an experimental modal analysis to gather certain material property data. The experimental findings showed little variation in the damping performance regardless of the magnetic field used, while the numerical analysis indicate that the magnetic fields would quicken damping, but only slightly. The results suggest that improvements to the sandwich beam structure may yield the greatest improvement in MR-fluid-based damping performance.

关键词： Magnetorheological fluids free decay sandwich beam magnetic field damping modal analysis

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A novel anti-collision strategy with integrated tensegrity for the bridge pier 17

A novel anti-collision strategy with integrated tensegrity f...

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conference on active and passive smart structures and integrated systems XVII

作者： Zhang, Lu Wei, Yanfang Li, Hongyu Guilin Univ Technol Coll Civil Engn & Architecture Guilin 541004 Guangxi Peoples R China

ISBN: (纸本)9781510660731;9781510660748

Bridge pier is the key components for transferring loads between the bridge and foundation. Its status significantly impacts on the safety of the entire bridge. While the sudden external force (e.g. vehicle collision, explosion, earthquake etc.) could cause catastrophic properties loss and casualties. Therefore, many anti-collision implementations are used in the bridge pier. The rigid protections and soft buffer structures, which are the conventional anti-collision methods. The former cannot lower the damage to vehicle and passengers, and the latter is capable of withstanding the minor or moderate vehicle collision only. In order to overcome the shortcomings of the conventional anti-collision method, tensegrity as a prestressed tensioned structure is proposed to be integrated with the bridge pier as a shielding component. The integrated tensegrity can absorb impact energy of the vehicle-pier-collision through large deformation or localized damage to protect the core pier. Therefore, this paper proposed a detailed anti-collision design with integration of tensegrity for the bridge pier. Additionally, the assessments of its statics and dynamics are given. Furthermore, the anti-collision effect has been illustrated, numerically. The process of the vehicle-pier-collision in three different velocities were simulated by ANSYS/LS-DYNA;the energy absorption is analyzed. The relationship between deformation state and absorbed energy was also obtained. Therefore, the feasibility of the proposed design has been fully explained. It provides an option for the anti-collision design in the bridge pier.

关键词： integrated tensegrity large deformation anti-collision

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Enhancement of a smart stretchable resistive heater textile using printed electronic coatings: Towards application in automobile 17

Enhancement of a smart stretchable resistive heater textile ...

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conference on active and passive smart structures and integrated systems XVII

作者： Diatezo, Leopold Le, Minh-Quyen Tonellato, Christine Puig, Lluis Capsal, Jean-Fabien Cottinet, Pierre-Jean Univ Lyon INSA Lyon LGEF EA682 F-69621 Villeurbanne France Co TESCA Grp Res Creator & Mfg Text & Components Massanes 17452 Spain

ISBN: (纸本)9781510660731;9781510660748

Intelligent textiles are predicted to see a surprising development in the future. The consequence of this revived interest has been the growth of automobile industry and the improvement of innovative methods for the incorporation of electrical and thermal features into textiles materials. In the present work, the development of a smart stretchable heating device integrated into a car-seat headrest has been identified as a target application. The need for smart conductive materials is becoming increasingly apparent, but they still represent a great challenge for the heating textile area, particularly in additive manufacturing. Polymer-based composites reinforced with copper and carbon powders, attractive as advanced coatings, seems to be good solutions to this issue. Such composites are now acquainted as ideal materials for electronic device engineering and fabrication, thanks to their excellent electrical and thermal conductivities while maintaining suitable mechanical compliance. For easier process and integration, an extrusion 3D printer is employed to achieve thin films coated on the surface of the textile substrate. The developed heater device consists of two principal copper electrodes (so-called power bus), and one heating resistor made of carbon composites designed in different configurations. Finite element models (FEM) are developed to predict the heating behavior of the tested fabric substrates under different pattern suggestions. Experimental measurements via a thermal camera are in consistent with the numerical solutions. It is pointed out that the design optimization based on an adequate tuning of the pattern's parameters allows to solve inevitable matters in terms of temperature regularity and overheating effect.

关键词： Printed electronic coatings flexible conductive inks smart heating textiles design optimization automobile applications finite element models.

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smart Acoustic Lining for UHBR Technologies Engine: from the design of an electroacoustic metasurface to experimental characterization under flow 17

Smart Acoustic Lining for UHBR Technologies Engine: from the...

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conference on active and passive smart structures and integrated systems XVII

作者： Billon, K. Gillet, M. Salze, E. Volery, M. De Bono, E. Ouisse, M. Lissek, H. Collet, M. Mardjono, J. Univ Lyon Ecole Cent Lyon LTDS UMR 5513 F-69134 Ecully France Univ Lyon Ecole Cent Lyon LMFA UMR 5509 F-69134 Ecully France Inst FEMTO ST CNRS SUPMICROTECH F-25000 Besancon France Ecole Polytech Fed Lausanne Signal Proc Lab LTS2 Stn 11 CH-1015 Lausanne Switzerland Safran Aircraft Engines F-75015 Paris France

ISBN: (纸本)9781510660731;9781510660748

The SALUTE project aims at evaluating performance of electroacoustic metasurface, employing a surface array of controlled electroacoustic actuators, for smart acoustic lining under grazing turbulent flow to be used in UHBR Technologies Engines. Theoretical and numerical investigations have been carried out for designing innovative concepts for complex aero-acoustic characterization in an engine mock-up. A specific focus was placed in the realization of prototypes for evaluating the metacomposite liner performances in 3D liners close to real engine implementation, its process complexity and robustness. This project provides new tools for designing smart acoustic liners;while acoustical experimental tests demonstrate efficiency and robustness of such technology for controlling UHBR noise emission. This paper presents the concept development from theory to technological realization and characterization by produced numerical tools. The experimental results obtained with the liners in acoustic flow duct facilities (FDF) have been realized in the PHARE facilities of Ecole Centrale de Lyon. Different configurations of liners have been tested using similar flow conditions as in target engine: 1 passive liner used as reference and a 3D active liner based on an array of electroacoustic absorbers. The final tests campaign comprises acoustics and aerodynamics measurements to characterize the aeroacoustics flow conditions, the membrane behavior, the achieved synthetic acoustic impedance and the resulting insertion loss.

关键词： active liner Electroacoustic absorber Impedance control Broadband noise reduction

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Traveling Wave Characteristics on Two-dimensional Finite structures using Hilbert Transform 17

Traveling Wave Characteristics on Two-dimensional Finite Str...

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conference on active and passive smart structures and integrated systems XVII

作者： Yang, Meng-Han Hsu, Yu-Hsiang Lee, Chih-Kung Natl Taiwan Univ Dept Engn Sci & Ocean Engn 1Sect 4Roosevelt Rd Taipei 106 Taiwan Natl Taiwan Univ Inst Appl Mech 1Sect 4Roosevelt Rd Taipei 106 Taiwan Grad Inst Elect Engn 1Sect 4Roosevelt Rd Taipei 106 Taiwan Grad Sch Adv Technol 1Sect 4Roosevelt Rd Taipei 106 Taiwan

ISBN: (纸本)9781510660731;9781510660748

In this study, we develop a method to analyze traveling waves generated by two bending modes of a two-dimensional piezoelectric actuator. This actuator has a composite structure constructed by a stainless-steel plate and piezoelectric PZT sheets. A developed analytical model analyzed the characteristics and efficiency of the traveling waves generated by the superposition of different bending modes. Using the multi-integer frequency, two-mode (MIF-TM) driving method, a steady traveling wave can be generated using two driving frequencies with an integer multiple relationships and near two bending modes. The optimization of the driving parameters is conducted by developing a cost function using the Hilbert transform, in which the driving voltages and the phase difference between the two driving frequencies are used. Finally, this analysis method is verified by using the finite element method.

关键词： piezoelectric actuator traveling wave Hilbert transform two-integer-frequency two-mode method

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Structural modal parameter identification incorporating with semi-active piezoelectric control 17

Structural modal parameter identification incorporating with...

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conference on active and passive smart structures and integrated systems XVII

作者： Hara, Yushin Asanuma, Haruhiko Otsuka, Keisuke Makihara, Kanjuro Tohoku Univ 6-6-01 Aramaki Aza Aoba Sendai Miyagi Japan Kanazawa Univ Kakuma Machi Kanazawa Ishikawa Japan

ISBN: (纸本)9781510660731;9781510660748

In this paper, we present a novel structural identification method using semi-active inputs generated by piezoelectric transducers. Structural identification using input and output information provides an accurate structural model. Conventional identification uses a maximum-length sequence, whose signal shape is similar to a square wave, as input. To generate inputs suitable for identification, several devices are required. These devices consume a lot of energy. If inputs are generated by a small number and simple design devices with low consumption, structural identification will be more practical. Piezoelectric semi-active control has been used in the research field of vibration control. This control generates a semi-active input whose signal shape is similar to a square wave. The semi-active input is generated by a simple circuit. The generation of the semi-active input consumes little energy. Therefore, the semi-active input has the potential to be used as an identification input instead of the maximum-length sequence. The property of the semi-active input is related to the generation strategy. This paper proposes a novel strategy to generate a semi-active input suitable for identification. Due to the unique mechanism of semi-active input generation, the novel strategy sometimes has the problem of generating semi-active inputs that are not suitable for identification. This paper discusses the reason and the solution to this problem. The feasibility of semi-active identification is presented through the numerical simulation and validation experiment. The identification result of the proposed method was close to the exact model. The proposed method achieved a 99% reduction in energy consumption.

关键词： Structural identification piezoelectric semi-active control SSDI

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Influence of manufacturing parameters on the quality of electrodes of a multi-layer capacitive strain sensor based on dielectric elastomers 17

Influence of manufacturing parameters on the quality of elec...

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conference on active and passive smart structures and integrated systems XVII

作者： Prokopchuk, Artem Ewert, Arthur Menning, Johannes Richter, Andreas Schlecht, Berthold Wallmersperger, Thomas Henke, Markus E. -F. Tech Univ Dresden Inst Semicond & Microsyst D-01062 Dresden Germany Tech Univ Dresden Inst Machine Elements & Machine Design D-01062 Dresden Germany Tech Univ Dresden Inst Solid Mech D-01062 Dresden Germany PowerON Grp Auckland 1010 New Zealand

ISBN: (纸本)9781510660731;9781510660748

Since the significant growth of interest in soft robotics, artificial muscles and biomimetics, soft, capacitive dielectric elastomer sensors (DES) have been in the focus of development. However, when including a sensor into any device, tool or, for example, a machine element, there are several factors which have to be considered, e.g., the ease of embedding the sensor, the maintenance of the functionality of the machine element, as well as the quality of the embedded sensors and their reproducibility. In this work, we will focus on the quality of the sensor and present a procedure for manufacturing multi-layer capacitive strain sensors. In order to assess the influence of different manufacturing processes on the quality of capacitive DES, a variety of thin multi-layer sensors were fabricated. Furthermore, using an LCR meter, the equivalent electrical capacitances (C) at the two sensor contacts were measured. It is shown that C varies depending on the quality of the electrodes. By testing multi-layer DES (ML-DES) with an electrode diameter of d(electrode) = 3 mm, with three and four electrode layers, a maximum capacitance of C-0 = 6.7 pF and C-0 = 10.5 pF was achieved for the undeformed sensor, respectively. The obtained capacitance values show that following the presented recommendations for creation the electrodes enables to improve the reproducibility and quality of the manufactured ML-DES. The fabricated sensor is soft and deformable due to the compliance of the elastomeric film used. Such a capacitive ML-DES can be used, for example, as a soft strain sensor implemented into the elastic element of a jaw coupling.

关键词： Dielectric elastomers strain sensor multi-layer capacitive sensor jaw coupling carbon black based electrodes sensor-integrated machine elements Doctor Blade

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Voltage modulation of elastic properties of asymmetric hybrid lattice structure 16

Voltage modulation of elastic properties of asymmetric hybri...

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active and passive smart structures and integrated systems XVI 2022

作者： Singh, Amanpreet Mukhopadhyay, Tanmoy Adhikari, Sondipon Bhattacharya, Bishakh Department of Mechanical Engineering Indian Institute of Technology Kanpur Kanpur208016 India Department of Aerospace Engineering Indian Institute of Technology Kanpur Kanpur208016 India James Watt School of Engineering The University of Glasgow United Kingdom

ISBN: (数字)9781510649620

ISBN: (纸本)9781510649613

2-D lattice structures have gained significant attention in the last few decades. Extensive analytical and experimental studies have been conducted to determine the elastic properties of the lattice structures. Further, the variation in the elastic properties of the passive lattice structures by changing various dimensional parameters and geometry have also been studied. However, once manufactured, it is impossible to vary the elastic properties of these lattice structures. A few studies have been conducted to understand the modulation of the elastic properties in symmetric hybrid lattice structures. This article proposes a geometrically asymmetric hybrid lattice structure having piezoelectric material on the opposite faces (top and bottom) of the consecutive inclined cell walls, respectively. The closed-form expressions have been derived by considering a bottom-up approach neglecting the axial deformation of the cell walls. Young's modulus has emerged to be a function of externally applied voltage, warranting control of the elastic properties of the structure even after manufacturing. In contrast, Poisson's ratio is independent of externally applied voltage. The transition from negative to positive values for Young's modulus has also been observed at specific cell angle values and externally applied voltage to stress ratio. This study intends to provide the basic framework for voltage-dependent elastic properties in asymmetric lattice structures for potential use in various futuristic multi-functional structural systems and devices across different length scales. © 2022 SPIE.

关键词： Honeycomb structures

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active paraffin wax phase change actuators for intelligent process control 16

Active paraffin wax phase change actuators for intelligent p...

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conference on Behavior and Mechanics of Multifunctional Materials XVI Part of SPIE smart structures + Nondestructive Evaluation conference

作者： Germann, T. Hinrichs, F. Koetting, T. Groche, P. Tech Univ Darmstadt Inst Prod Engn & Forming Machines Otto Berndt Str 2 D-64287 Darmstadt Germany

ISBN: (数字)9781510649644

ISBN: (纸本)9781510649644;9781510649637

Process fluctuations due to changing environmental conditions, thermal loads and wear are known problems in industrial production. When accumulated, they can lead to instabilities in process chains. Paraffin wax-based phase change actuators (PCA) are an available, robust solution for stabilization and error compensation. Consisting of two deep-drawn steel cups, joined by laser welding, they enclose a paraffin wax core. Phase transformation of the paraffin wax leads to a significant volume expansion, generating the actuating force. The PCAs are suitable even for highly rigid systems with achievable actuating forces of above 85 N/mm(2) of effective actuator area. Additionally, the particularly compact housing offers high integration capability. passive PCAs, activated by environmental heat, are already integrated in industrial applications. For active application, an energy supply via additional external heating elements, e.g. heating tapes, is required. This contradicts the concept of a simple and compact overall system and thus the integration capability. The overriding challenge results in implementing the PCA as an actively controllable, integrated overall system. This paper presents an approach based on printed electronics, consisting of a conductive carbon ink, applied to a corresponding substrate by means of screen-printing. Electrical connections are subsequently attached and the heating unit is integrated into the PCA. This work shows challenges within design and implementation of these high-performance heating electronics. It discusses different inks, substrates and their necessary properties for PCA usage. Concepts for electrical conduction through the sealed actuator housing are presented. Finally, the performance of these PCAs is discussed and compared with passive, externally activated PCAs.

关键词： Phase-change-actuators process stabilization printed electronics paraffin wax integrated actuators

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Integration of magnetic shape memory alloy actuator in fine boring tool positioning system 15

Integration of magnetic shape memory alloy actuator in fine ...

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conference on active and passive smart structures and integrated systems XV

作者： Panesso, M. Rau, D. Pagel, K. Boehm, A. Wang, W-G Fraunhofer Inst Machine Tools & Forming Technol I Nothnitzer Str 44 D-01187 Dresden Germany

ISBN: (数字)9781510640061

ISBN: (纸本)9781510640061

In order to meet new manufacturing requirements, the implementation of smart materials in highly integrated mechatronic components, such as precision positioning systems in machine tools, is an alternative to bulky conventional electromechanical actuators. Magnetic shape memory alloy (MSM) actuators constitute an interesting alternative to both electromechanical and piezoelectric actuators. By harvesting the rotational energy of the tool body, it is possible to use MSM actuators together with permanent magnets to produce linear motions in the micrometer range. With the proposed approach, a higher level of integration is possible by eliminating the electronic control, thus reducing size and complexity of the system. This work presents a methodology for dimensioning MSM actuators excited by permanent magnets for producing linear motions in the micrometer range by exploiting the relative rotational motion of machine tool assemblies. The methodology consists in the simulation of the magnetic behavior of the actuator in order to predict the expected output stroke as a function of the magnet configuration. A novel concept for a fine boring tool with active cutting edge based on MSM actuation for finishing contoured cylinder bores in combustion engines illustrates the proposed methodology. Finally, a prototype was tested and the displacement at static and dynamic conditions in order to predict the corresponding contours at the cutting edge.

关键词： magnetic shape memory alloys (MSMAs) smart materials and structures micro positioning machining tools non-circular contours connecting rod cylinder bore

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