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Dissertations / Theses on the topic 'Absorber plate'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Ashour, Osama Naim. "Nonlinear Control of Plate Vibrations." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26266.

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A nonlinear active vibration absorber to control the vibrations of plates is investigated. The absorber is based on the saturation phenomenon associated with dynamical systems with quadratic nonlinearities and a two-to-one internal resonance. The technique is implemented by coupling a second-order controller with the plate's response through a sensor and an actuator. Energy is exchanged between the primary structure and the controller and, near resonance, the plate's response saturates to a small value. Numerical as well as experimental results are presented for a cantilever rectangular pl

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2

Marcotte, Pierre. "A Study of Distributed Active Vibration Absorbers (DAVA)." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/28897.

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DAVAs are distributed active and passive devices that can be numerically modelled to provide optimum control of low frequency (< 1000 Hz) mean square velocity and sound power radiation. A numerical model of a multi-DAVA system was developed using the Rayleigh-Ritz method coupled to a hierarchical finite element set (p-method). The numerical model was validated and used to optimize DAVA configurations using lightweight treatments (< 10 % the weight of the base plate weight). The optimizations were performed using genetic algorithms implemented in parallel. They were used to minimize, either pa

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3

Ammari, Ali. "Experimental Investigation ofTwo-phase Flow in Microchannels“Co-current Absorption of Ammonia in Water to Design an Innovative Bubble Plate Absorber” : “Co-current Absorption of Ammonia in Water to Design an Innovative Bubble Plate Absorber”." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116779.

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For ammonia-water absorption refrigeration technology it is suggested to use bubble type absorbers because the higher contact surface area provides a higher mass transfer rate. Furthermore, dispersion of bubbles in the bulk of liquid phase also exhibits better heat transfer characteristics that facilitate the recovery of dissipated heat of the exothermic absorption.In this context, plate heat exchangers are believed to be an option to be employed as absorber in some applications. Commercial plate heat exchangers have only one inlet and outlet for a working fluid and as a result, gas and liquid

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4

Myung, Noh Hoon. "A high frequency analysis of electromagnetic plane wave scattering by perfectly-conducting semi-infinite parallel plate and rectangular waveguides with absorber coated inner walls /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267546980859.

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5

Hueffed, Anna Kathrine. "A SIMPLIFIED MODEL OF HEAT AND MASS TRANSFER BETWEEN AIR AND FALLING-FILM DESICCANT IN A PARALLEL-PLATE ABSORBER." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-150013/.

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A simplified model is developed to predict the heat and mass transfer between air and falling-film liquid desiccant during dehumidification in a parallel-plate absorber. Compared to the second-order partial differential equations that describe fluid motion, first-order, non-coupled, ordinary differential equations are used to estimate the heat and mass transferred and explicit equations are derived from conservation principles to determine the exiting conditions of the absorber for different flow arrangements. The model uses a control volume approach that accounts for the change in desiccant f

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6

Ammari, Ali. "Experimental Investigation of two-phase flow in microchannels. Co-current Absorption of Ammonia in Water to Design an Innovative Bubble Plate Absorber." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156190.

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For ammonia-water absorption refrigeration technology it is suggested to use bubble type absorbers because the higher contact surface area provides a higher mass transfer rate. Furthermore, dispersion of bubbles in the bulk of liquid phase also exhibits better heat transfer characteristics that facilitate the recovery of dissipated heat of the exothermic absorption. In this context, plate heat exchangers are believed to be an option to be employed as absorber in some applications. Commercial plate heat exchangers have only one inlet and outlet for a working fluid and as a result, gas and liqui

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7

Leray, Cedric. "Etude du comportement thermique et thermomécanique des récepteurs solaires sous haut flux radiatif." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0003/document.

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Dans le contexte énergétique qui se profile, la production d’électricité par voie solaire thermodynamique s’avère une solution prometteuse, que ce soit pour des considérations économiques, d’échelle de production ou environnementales. Une voie d’amélioration du rendement des centrales solaires à tour consiste à utiliser des cycles thermodynamiques à haut rendement type cycles combinés. Cela nécessite de pouvoir fournir un fluide de travail pressurisé à très haute température (10bar et 1000°C minimum). Ce manuscrit présente les travaux menés afin de développer et de viabiliser un concept d’abso

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8

Triché, Delphine. "Étude numérique et expérimentale des transferts couplés de masse et de chaleur dans l’absorbeur d’une machine à absorption ammoniac-eau." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI095/document.

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Les machines frigorifiques à absorption ammoniac-eau sont prometteuses dans les domaines de la climatisation solaire et de la valorisation des rejets thermiques pour l’industrie. Pour permettre à ces machines de devenir compétitives par rapport aux systèmes à compression mécanique de vapeur, l’amélioration de leur efficacité et la baisse de leur coût sont nécessaires. C’est dans ce contexte que s’inscrit ce travail de thèse.L’étude se concentre sur l’absorbeur qui est un des composants les plus critiques de la machine à absorption en matière de taille, de coût et d’efficacité. L’objectif est d

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9

Oyinlola, Muyiwa Adeyinka. "Heat transfer in solar absorber plates with micro-channels." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77388/.

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Analytical, computational and experimental studies were carried out to investigate heat transfer and fluid flow in micro-channel absorber plates for compact (thin and light-weight) solar thermal collectors. The main objective of the work was to study different design and/or operating scenarios as well as study the significance of various micro-scaling effects. Analytical investigation showed that, under similar conditions, the proposed design yields a much higher fin efficiency, F and collector efficiency factor, F’ compared with the conventional solar collector design. An analytical model com

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10

Chen, Weibo. "Investigation of heat and mass transfer characteristics in an absorber with perforated plates /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487949150068457.

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11

Forslund, Ola. "Scattering and propagation of electromagnetic waves in planar and curved periodic structures - applications to plane wave filters, plane wave absorbers and impedance surfaces." Doctoral thesis, KTH, Alfvén Laboratory, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3825.

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<p>The subject of this thesis is scattering of electromagneticwaves from planar and curved periodic structures. The problemspresented are solved in the frequency domain.</p><p>Scattering from planar structures with two-dimensionalperiodic dependence of constitutive parameters is treated. Theconstitutive parameters are assumed to vary continuously orstepwise in a cross section of a periodically repeating cell.The variation along a longitudinal coordinate z is arbitrary. Ageneral skew lattice is assumed. In the numerical examples, lowloss and high loss dielectric materials are considered. Thepro

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12

Rey, Hervé. "Utilisation de la modélisation 3D pour l'analyse et la simulation du développement et de la croissance végétative d'une plante de tournesol en conditions environnementales fluctuantes (température et rayonnement)." Montpellier, ENSA, 2003. http://www.theses.fr/2003ENSA0023.

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Pour analyser et modéliser l'effet de la température et de la lumière sur la croissance foliaire de plantes de tournesol, des plantes numériques 3D sont construites au moyen du logiciel AMAPsim. Ces plantes servent de support à l'estimation du bilan radiatif de la culture (MIR-MUSC-RADBAL) dans diverses conditions expérimentales. La mise en place de l'architecture des plantes et l'évolution de l'absorption du rayonnement (non mesurable expérimentalement) à l'échelle des organes, de la plante et du couvert sont analysés. Le rayonnement absorbé par la plante, mis en relation avec les variations

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13

Konate, Souleymane. "Traitement de surface des matériaux à usage solaire : mise en place de la spectroscopie de photodéplacement en vue de l'étude du rendement thermique des absorbeurs sélectifs obtenus sur substrat cuivre ; élaboration et caractérisation d'absorbeurs et d'émetteurs sélectifs sur substrat zinc." Toulouse 3, 1997. http://www.theses.fr/1997TOU30158.

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Etude des materiaux a usage energetique : recherche et mise en place de la spectroscopie de photodeplacement (spd) ; application a l'etude du rendement thermique des absorbeurs selectifs sur substrats cuivre. Elaboration et caracterisation d'absorbeurs et d'emetteurs selectifs sur substrats zinc. Techniques utilisees : traitement electrochimique, mesures des proprietes optiques et caracterisation par ftir, meb, sie, eds, sims.

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14

Chi, Chen Hua, and 季振華. "absorber design for machine-plate system and tube system." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/31369370501083150287.

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碩士<br>國立中央大學<br>機械工程學系<br>86<br>the main purpose of issue is discussed the optimal design for adding control system in the system of absorber,first of all, the passive absorber is connected with a spring and a damper,at the first part,the force is band-limited white noise of random vibration,find out transfer function,then,it can be used feedback margin data of fixing to control it,get another function,finally,we can get optimal tuning ratio and damping ratio by minimizing variance of reac

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15

Kiran, Deo. "Evaluating Various Models of Perforated Plate and Porous Absorber." Thesis, 2018. http://ethesis.nitrkl.ac.in/9909/1/2018_MT_216ID1336_DKiran_Evaluating.pdf.

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Perforated plate is a thin panel with periodic arrangement of small perforations in front of air gap which prevents the sound waves passing through it. Present work explains the different mathematical models for perforated plate and porous absorber. Two methods for finding the absorption coefficient have been discussed. It has been shown that perforated plate can also be modeled as equivalent fluid approach following the work of Johnson-Champoux-Atalla with an equivalent tortuosity. Four different cases have been taken for consideration and are solved by methods namely transfer matrix method a

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16

Liu, Chin-Chi, and 劉俊志. "Experiments studies of submerged breakwaters and submerged horizontal plate wave absorber effect." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/62789197325875843527.

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17

Kuang-ChengYen and 顏廣程. "Effects of Forced Excitation on the Performance of a Flat Plate LiBr Absorber." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/11462704007510693742.

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18

Shyam. "Performance analysis of photovoltaic thermal flat plate collectors and direct absorber solar collectors." Thesis, 2017. http://localhost:8080/xmlui/handle/12345678/7311.

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19

LO, Jheng-Syuan, and 羅正暄. "Application of Submerged Crescent-Shape Plate to Enhance Extracting Efficiency of the Point Absorber Wave Energy Farm." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5f4r83.

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碩士<br>國立臺灣海洋大學<br>河海工程學系<br>105<br>This research investigates the effect of the wave extracting efficiency in a wave farm with a submerged crescent-shape plate, installed with point absorber wave energy converters (WEC). It analyzes the relation between energy absorption coefficient point absorber WEC and coverage ratio of the wave farm. In this study, boundary element method was employed to solve the small amplitude wave theory with the assumption of ideal flow, and to evaluate the wave farm design. The result shows that with an increasing of the damping coefficient and the coverage ratio, th

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20

Fu-TiHsu and 許富堤. "Investigation of Absorption Rate Enhancement by Controlled-disturbance on Aqueous LiBr Film Flowing over of a Flat Plate Absorber." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/82340166332477407546.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>101<br>The absorber plays a fairly important role in the absorption refrigeration system because it significantly influences the performance of the entire system . For an absorber , the absorbent is falling in form of liquid film in order to increase the contact area with the water vapor and , therefore , the absorption rate . Numerous studies have indicated that wavy films result in better absorption rate than smooth laminar films . The aim of the present research is to design a device to trigger wave films falling on a flat plate absorber of a lithium bromide ab

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21

Chen, Jun-Jie, and 陳俊傑. "Use of three-degree-of-freedom spring-damper-mass absorber for suppressing the vibration responses of a rectangular flat plate subjected to eccentric distributed dynamic loads." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48277854494014594418.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>100<br>Study on the vibration reduction is an important research topic in the field of structural engineering, therefore, the relevant information is abundant. Because the mathematical expressions for vibration reduction of plates are more complicated than those of beams, the literature relating to the former is relatively fewer. However, the literature concerning the suppression of torsiona-and-bending-coupled vibration responses of plates is limited. Thus, the object of this research is to present a theory regarding the 3-dof spring-damper-mass absorber, so tha

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22

Kao-Liang, Chang, and 張國亮. "Vibration Analysis of Plates by Plate-Type Dynamic Vibration Absorbers." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/93606596534914299921.

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碩士<br>國立中央大學<br>機械工程研究所<br>87<br>esented for behavio rof vibration of mainplate under random excitation and impact excitation,which boundary condition is simple supported.This system consists of a dynamic abso rbing plate under free boundary condition as the main plate and with uniformly distributed connecting springs and dampersbetween the main and dynamic absorb ing plates.By way of defection of mean squareresponse minimum we can obtain op timum frequency ratio,damper ratio,and positionserveral parameters.At lest

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23

Chou, Chung-Che, and 周中哲. "Plastic Models for Steel Triangular Plate Energy Absorbers." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/60109095840058009817.

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24

Li, Jeng-Wie, and 栗正暐. "Experimental Study of Steel Plate Energy Absorbers Using Sub- structure Pseudodynamic Testing Procedures." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/26204155759918683599.

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25

Hettema, Charles Dean. "The modeling of viscoelastic circular plates for use as waveguide absorbers." Thesis, 1988. http://hdl.handle.net/10945/23315.

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26

Nanda, Raj Kumar. "Resonant response of beams and rectangular plates with discrete viscoelastic dampers and absorbers." Thesis, 1987. http://localhost:8080/iit/handle/2074/4929.

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27

Wu, Jyun-Hong, and 吳俊宏. "Optimal design of passive piezoelectric absorbers for vibration reduction of a plate subject to an impact force." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/26xp3f.

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碩士<br>國立中央大學<br>機械工程研究所<br>97<br>This thesis investigates reducing vibration of a thin plate by using a new type of passive piezoelectric absorbers. The thin plate is simply supported and subjected to an external impact force at its center. Two piezoelectric absorbers are attached to both sides of the plate. Each absorber is made of a piece of piezoelectric material connected to passive electric components. The equation of motion of the composite plate is derived by applying Hamilton’s principle. The equations of circuits are also obtained. Combining these two types of equations and usin

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28

Lee, Fan-Ching, and 李芳慶. "The study of porous plates / acoustic absorbent materials with roughness surface in sound absorption." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/92657382288180268707.

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碩士<br>國立清華大學<br>動力機械學系<br>84<br>The objective of this work is to study the influence of porous plates / acoustic absorbent materials with various shapes of roughness surface on the sound absorption using finite element method and two-microphone impedance tube experiment. Four roughness surface shapes of acoustic absorbent materials, say, triangle, semi-circle, convex rectangle and plate shape, are chosen. Different porous plates are also placed in front of the above acoustic absorbent mater

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