Academic literature on the topic 'Fluid viscous damper'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Fluid viscous damper.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Fluid viscous damper"
1
Solmazyaghobzadeh, Solmazyaghobzadeh. "Determining the Best Insertion Site of Fluid Viscous Dampers to Optimize and Reduce Incurredcosts in Adjacent Buildings." Modern Applied Science 10, no. 9 (2016): 130. http://dx.doi.org/10.5539/mas.v10n9p130.
Full textAbstract:
In the past decade, researchers developed the idea of connecting buildings with intelligent activated, semi-active and inactivated damper systemsreduce adjacent buildings response to wind and earthquake. One of the most important damper devices in non-active control is fluid viscous damper.Fluid dampers due to viscous fluidsshow high resistance. High resistance of viscous fluidsagainst the flow is the basicfunctionof fluid viscous dampers. Deformation speed a fluid viscous damper is proportional to the acted forces. Therefore the aim of this paper is to determine the insertion site of fluid viscous dampersto optimize and reduce the consuming costs in adjacent buildings. For this purpose, four different models of connected adjacent buildings with common and different shear stiffness in the software SAP 2000 has been modeled. This study shows that it is not necessarytwo adjacent buildings connected by a damper on all floors, but the less damper in appropriate selected locations can help reduce the earthquake response. And by placing the fluid viscous dampers in selected certainfloors provides more useful structural system for reducing the effects of earthquakes.
2
Madgounkar, Sachin Sunil, Naveen Kumar H. S, and Chethan Gowda R. K. "Comparative Study on Seismic Behavior of High–Rise Steel Building with and Without Friction Damper and Fluid Viscous Damper: A Review." International Journal for Research in Applied Science and Engineering Technology 10, no. 8 (2022): 1649–53. http://dx.doi.org/10.22214/ijraset.2022.46373.
Full textAbstract:
Abstract: Seismic forces are induced on the structure present in earthquake prone areas. These are induced due to the movement of tectonic plates. Multi-storey buildings are those that have more than two stories, hence undergo large amount of deflection due to their slender structure. Due to the deflection caused by the ground accelerations during earthquakes, the structure is unstable and the structure undergoes damage which is not safe. Passive energy dissipation devices are gaining significance in design of earthquake resistant structures because of their effective performance in controlling seismic effects on structures during earthquake. Friction dampers and fluid viscous damper are passive energy dissipating devices which are used widely as seismic control devices. The present study was conducted analytically on a 15-storey steel frame with regular and irregular configuration and performance of structure against non-linear time history ground movement with and without friction damper and fluid viscous damper. Time history ground acceleration data of Bhuj earthquake (2001) were applied on the structure and the response of friction damper and fluid viscous damper was analyzed and compared. The analysis of the structure for the non-linear dynamic ground acceleration was conducted using ETABS software. The results show that when a friction damper is used instead of a fluid viscus damper, storey displacement is greatly reduced by 25.52%. whereas results shows that storey shear, storey drift, and storey acceleration are greatly reduced by 27.75%, 30.39% and 15.27%, when fluid viscous damper is used instead of a friction damper.
3
Soheila, Kookalani, and Shen Dejian. "Effect of Fluid Viscous Damper parameters on the seismic performance." Journal of Civil Engineering and Materials Application 4, no. 3 (2020): 141–53. https://doi.org/10.22034/jcema.2020.232288.1025.
Full textAbstract:
Energy dissipation devices are widely used to enhance the response of structures subjected to dynamic loads caused by wind and earthquake. Especially, viscous dampers are hydraulic devices widely used in structural engineering that dissipate mechanical energy by producing a damping force against the motion. The dampers can mitigate transversal and longitudinal or vertical displacement. It can be set up in different kinds of structures. This study is aimed at comparing the impact of various Fluid viscous damper parameters on the structures under the earthquake. To this aim, a seven-story steel frame structure retrofitted with fluid viscous dampers was considered for analyzing with a variety of parameters. The results showed that installing longitudinal nonlinear Fluid viscous damper can reduce the seismic response significantly, by selecting affordable damping parameters including stiffness, damping coefficient, and velocity exponent. The optimum damping parameters can be calculated accurately by analyzing structure with different damping parameters of nonlinear Fluid viscous damper.
4
Jia, Sihui, and Mingzhang Luo. "Monitoring of Liquid Viscosity for Viscous Dampers through a Wireless Impedance Measurement System." Applied Sciences 12, no. 1 (2021): 189. http://dx.doi.org/10.3390/app12010189.
Full textAbstract:
Viscous dampers are a type of seismic damping equipment widely used in high-rise buildings and bridges. However, the viscosity of the damping fluid inside the viscous damper will change over time during its use, which significantly reduces the seismic performance of the viscous damper. Hence, it is necessary to monitor the viscosity of the fluid inside the damper over its service life. In this paper, a damping fluid viscosity monitoring method based on wireless impedance measurement technology is proposed. A piezoelectric sensor is installed in a damper cylinder specimen, and the viscosity of the damping fluid is determined by measuring the piezoelectric impedance value of the sensor. In this study, 10 samples of damping fluids with different viscosities are tested. In order to quantitatively correlate damping fluid viscosity and electrical impedance, a viscosity index (VI) based on the root mean square deviation (RMSD) is proposed. The experimental results show that the variation of the real part in the impedance signal can qualitatively determine the damping fluid viscosity while the proposed VI can effectively and quantitatively identify the damping fluid viscosity.
5
Hussain, Danish, Ashish Shukla, Sunita Bansal, et al. "Seismic Parametric Analysis of RC Multi-Storied Buildings with and Without Fluid Viscous Dampers." E3S Web of Conferences 529 (2024): 01017. http://dx.doi.org/10.1051/e3sconf/202452901017.
Full textAbstract:
Earthquakes are enormous natural disasters that increase the energy within the structural system, causing catastrophic destruction. Various control systems, such as passive, active, hybrid, and semi active control systems, can be used to dissipate this unwanted energy. The fluid viscous damper is one such dissipation device used in this study. The goal of this project is to use a fluid viscous damper to lessen the seismic response of the Symmetrical and unsymmetrical G+9 structure in ETABS2017. To obtain the seismic response with and without a fluid viscous damper, ETABS2017 was used to analyse symmetrical and unsymmetrical structures with and without a fluid viscous damper. The analysis takes into account nonlinear temporal history, which is derived using fast nonlinear analysis of Electro data. The position and function of dampers are discussed in this study. For seismic evaluation of buildings with and without fluid viscous dampers, the equivalent static approach and response spectrum method are utilised. The structure was examined utilizing ETABs 2017 programming, with seismic zone IV and medium soil (Type II) according to IS 1893-2016. The structure’s exhibition is assessed utilizing story removal, story shear, story float, and modular periods and frequencies. The objective of this study is to about the consequences of static and reaction range examination in both longitudinal and cross over bearings for damper development with and without damper structure.
6
Vasile, Ovidiu, and Mihai Bugaru. "A New Modeling Approach for Viscous Dampers Using an Extended Kelvin–Voigt Rheological Model Based on the Identification of the Constitutive Law’s Parameters." Computation 11, no. 1 (2022): 3. http://dx.doi.org/10.3390/computation11010003.
Full textAbstract:
In addition to elastomeric devices, viscous fluid dampers can reduce the vibration transmitted to dynamic systems. Usually, these fluid dampers are rate-independent and used in conjunction with elastomeric isolators to insulate the base of buildings (buildings, bridges, etc.) to reduce the shocks caused by earthquakes by increasing the damping capability. According to the EN 15129 standard, the velocity-dependent anti-seismic devices are Fluid Viscous Dampers (FVDs) and Fluid Spring Dampers (FSDs). Based on experimental data from a dynamic regime of a fluid viscous damper of small dimensions, for which not all the design details are known, to determine the law of behavior for the viscous damper, the characteristics of the damper are identified, including the nonlinear parameter α (exponent of velocity V) of the constitutive law. Note that the magnitude of the fluid damper force depends on both velocity (where the maximum value is 0.52 m/s) and amplitude displacement (±25 mm). Using the Kelvin–Voigt rheological models, the dynamic response of a structure fixed with a fluid viscous device is analyzed, presenting the reaction force and displacement during the parameterized application of an external shock. This new approach for FVDs/FSDs was validated using the standard deviation between the experimental data and the numerical results of the extended Kelvin–Voigt model offering researchers in the field of seismic devices a reliable method to obtain a constitutive law for such devices.
7
Trivedi, Abhay, Dr Gunjan Shrivastava, and Kishor Patil. "Seismic Analysis of Irregular Diaphragm Reinforced Concrete Building with Fluid Viscous Dampers." International Journal for Research in Applied Science and Engineering Technology 11, no. 7 (2023): 1970–76. http://dx.doi.org/10.22214/ijraset.2023.55029.
Full textAbstract:
Abstract: Fluid viscous damper is the most commonly used tool for controlling structures’ responses. Fluid viscous dampers with different construction technologies are applied in order decrease the responses of structures to the seismic vibrations. During the recent years, controlling structure has turned into a scientific technology to protect structures against wind and earthquake loads. In the present study linear dynamic and non-linear static analysis was adopted to assess the seismic performance of an irregular diaphragm building. Building with and without fluid viscous damper have been taken.The outcomes of the study will be beneficial to assess the performance of existing building vulnerable to seismic loads after the installation of fluid viscous dampers.
8
Zhou, P., M. Liu, WM Kong, YM Xu, and H. Li. "Effectiveness of In-Service Dampers over Long-Term Operation for Cable Vibration Suppression: A Study Based on Field Testing." Journal of Physics: Conference Series 2158, no. 1 (2022): 012040. http://dx.doi.org/10.1088/1742-6596/2158/1/012040.
Full textAbstract:
Abstract In order to explore the operation mechanism of dampers used on super long-span bridges, the characteristics of dampers in long-term operation are studied through field tests. Firstly, viscous damper and liquid leakage MR damper are selected to test the influence of fluid connecting rod on its damping force; Then, wireless and wired sensors are used to collect the acceleration response of cables with viscous dampers and MR dampers. Finally, the vibration characteristics of the cable are analyzed, and the control performance of the selected damper is evaluated. The results show that the high-order multi-modal vibration of the cable will occur in the range of 2-6hz whether the damper is installed or not. In addition, fluid leakage may reduce the additional modal damping ratio achieved by MR damper.
9
Waghmare, Manisha V., Suhasini N. Madhekar, and Vasant A. Matsagar. "Influence of Nonlinear Fluid Viscous Dampers on Seismic Response of RC Elevated Storage Tanks." Civil Engineering Journal 6 (December 9, 2020): 98–118. http://dx.doi.org/10.28991/cej-2020-sp(emce)-09.
Full textAbstract:
The numerical investigation on the seismic response of RC elevated liquid storage tanks installed with viscous dampers is presented. A discrete two-mass model for the liquid and multi-degree of freedom system for staging, installed with the dampers are developed for Reinforced Concrete (RC) elevated liquid storage tanks. The elevated tank is assessed for seismic response reduction when provided with Linear Viscous Damper (LVD) and Nonlinear Viscous Damper (NLVD), installed in the staging. The RC elevated liquid storage tanks are analyzed for two levels of liquid containment in the tank, 100% and 25% of the tank capacity. Three Configurations of placements of dampers viz. dampers at alternate levels (Configuration I and Configuration II) and dampers at all the panels of the staging of the tank (Configuration III) are considered. To study the effect of peak ground acceleration, eight real earthquake time histories with accelerations varying from 0.1 g to 0.93 g are considered. The nonlinearity in the viscous damper is modified by taking force proportional to various velocity exponents. It is found that the nonlinear viscous dampers with lower damping constant result in a comparable reduction in the response of RC elevated liquid storage tank, to that of linear viscous dampers with higher damping constant. A lower damping constant signifies compact the size of the damper. Doi: 10.28991/cej-2020-SP(EMCE)-09 Full Text: PDF
10
Song, Yuanjin, Zhong Zhuang, Xianping Wang, Qianfeng Fang, Zhijun Cheng, and Tao Zhang. "Vibration Damping and Noise Reduction of a New Non-Newtonian Fluid Damper in a Washing Machine." Actuators 13, no. 1 (2023): 9. http://dx.doi.org/10.3390/act13010009.
Full textAbstract:
Due to friction vibration dampers’ inability to effectively dampen low loads during high-frequency dewatering, drum washing machines vibrated intensively. In order to address this problem, in this paper, a novel type of low-cost non-Newtonian fluid damper is proposed and investigated based on the non-Newtonian fluid shear thinning properties’ effect on vibration suppression during the high-frequency dewatering process of the washing machine. In contrast to other commonly used dampers, the homemade non-Newtonian fluid damper significantly suppresses the growth trend of the apparent elastic coefficient at high frequencies. A systematic investigation of damper structural parameters reveals that smaller gap height, higher piston head number, and more viscous fluid viscosity are adequate for vibration suppression and noise reduction. These results demonstrate that the non-Newtonian fluid damper can produce an excellent vibration-damping effect for the entire washing process of the washing machine, especially for the high-frequency dewatering process. The acceleration attenuation ratio can reach up to 83.49%, the energy attenuation is up to 98.44%, and the noise reduction is up to 10.38 dB.
Dissertations / Theses on the topic "Fluid viscous damper"
1
Valdebenito, Galo E. "Passive Seismic Protection of Cable-Stayed Bridges Applying Fluid Viscous Dampers under Strong Motion." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/6264.
Full textAbstract:
Terremotos recientes han demostrado la gran vulnerabilidad de algunos puentes ante movimiento fuerte. Los de tipo atirantado constituyen una tipología estructural muy atractiva, y que actualmente es empleada para muchos fines prácticos, por lo que es necesaria su protección sísmica. Entre las actuales estrategias de protección, el uso de dispositivos pasivos es la más robusta, económica y apropiada opción para mejorar el desempeño sísmico de estructuras, de entre los que destacan los sistemas de disipación de energía adicional como una buena alternativa. Debido a sus capacidades, fácil recambio y mantención, así como su buen comportamiento mecánico, los amortiguadores de fluidos viscosos son un excelente sistema de disipación de energía para proteger grandes estructuras contra eventos sísmicos intensos. Es por ello que el análisis, evaluación y comparación de la respuesta sísmica no lineal de puentes atirantados de hormigón, con y sin la incorporación de amortiguamiento viscoso suplementario, con el propósito de investigar su efectividad ante eventos sísmicos, es el principal objetivo de esta investigación aplicada. <br/><br/>Para alcanzar lo antes expuesto, se definieron previamente ocho modelos teóricos de puentes atirantados basados en los internacionalmente conocidos puentes de Walter [Walter, 1999], considerando variaciones del esquema de atirantamiento, nivel del tablero, tipo de tablero y espaciamiento de los cables. Como punto de partida para el análisis dinámico no lineal, se realizó un análisis estático no lineal para todos los casos. Luego, se llevó a cabo una caracterización dinámica de los puentes mediante un análisis modal. Como primera aproximación a la respuesta sísmica de los modelos, se ejecutó un análisis mediante espectros de respuesta para cada caso, con el propósito de comparar el comportamiento sísmico en función de las principales variaciones consideradas, y para seleccionar los dos modelos más representativos para ser analizados usando análisis no lineal paso-a-paso. En seguida, se analizaron las estructuras elegidas en el paso previo mediante uso de análisis temporal no lineal por integración directa, sin la consideración de amortiguamiento viscoso suplementario, y tomando en cuenta sismos de campo lejano y campo cercano. En este sentido, se aplicaron cinco eventos sísmicos artificiales para el análisis de campo lejano, y cinco eventos reales que incorporasen pulsos de velocidad de período largo para el análisis de campo cercano, según el Capítulo 3. Finalmente, el análisis de la ubicación óptima de los amortiguadores, un estudio paramétrico tendiente a seleccionar los parámetros óptimos de los mismos, y el análisis paso-a-paso no lineal considerando los amortiguadores viscosos definitivos, fueron investigados con la idea de comparar las respuestas en función de la naturaleza del evento sísmico y el tipo de atirantamiento de los cables, considerando los mismos eventos sísmicos antes expuestos. <br/><br/>Los resultados de la investigación muestran que la aplicación de amortiguamiento viscoso suplementario es una eficiente estrategia para incrementar el amortiguamiento de una estructura, absorbiendo una gran cantidad de la energía de entrada, y controlando la respuesta de estructuras de período largo, sobre todo en la dirección longitudinal, en donde se manifiestan las mayores respuestas. Más de un 55% de la energía de entrada puede ser disipada usando éstos dispositivos, los cuales resultan ser igualmente efectivos para sismos de campo lejano y campo cercano, con independencia del esquema de atirantamiento empleado, por lo que constituyen una excelente estrategia de protección pasiva. Debido a la gran no linealidad de éstas estructuras, el método del espectro de respuesta debe ser considerado sólo como primera aproximación al problema, y para propósitos comparativos. Para resultados más precisos, y para aplicaciones de diseño, el análisis no lineal paso-a-paso es siempre la mejor opción. Por otro lado, ésta investigación prueba el despreciable efecto del esquema de atirantamiento en la respuesta sísmica, así como el importante aumento de la respuesta cuando son tomados en cuenta los efectos tipo pulso de la directividad de la falla, característicos de sismos de fuente cercana.<br>Recent seismic events have demonstrated the vulnerability of some bridges under strong ground motions. Cable-stayed bridges are an attractive bridge typology currently used for many practical purposes, constituting important structural systems to be protected against earthquakes. Amongst the current seismic protection strategies, the use of passive devices is the most robust, economic and well-suited option to improve the seismic performance of structures, in which additional energy dissipation systems is good choice. Because of their capacities, easy replacement and maintenance, as well as their interesting mechanical properties, fluid viscous dampers could be an excellent additional energy dissipation system to protect large structural systems against strong earthquakes. For that reason, the analysis, assessment and comparison of the nonlinear seismic response of concrete cable-stayed bridges, with and without the incorporation of nonlinear fluid viscous dampers in order to investigate their effectiveness for seismic protection purposes, is the main objective of this applied research. <br/><br/>To reach the proposed objectives, firstly, eight theoretical cable-stayed bridge models based on the well-known Walter's Bridges [Walter, 1999] were defined; considering variations of the stay cable layout, deck level, deck type and stay spacing. As a starting point of the nonlinear dynamic analysis, a nonlinear static analysis was performed for all the cases. After that, the dynamic characterization of the models was carried out by means of a modal analysis. As a first approach of the seismic response of the bridges, response spectrum analysis was performed in order to compare the seismic behaviour as function of the main variations considered, and to select the two most representative bridges to be analyzed using nonlinear time history analysis. The following stage was the seismic analysis of the selected bridge models from the previous step, applying nonlinear direct integration time history analysis, without additional energy dissipation devices, and considering both far-fault and near-fault ground motions. In these sense, five artificially generated earthquake events were considered for the far-fault analysis, as long as five real earthquake events containing long-period velocity pulses were included for the near-fault analysis, according to Chapter 3. Finally, the analysis of the optimal layout of the dampers, a parametric study to select the optimal damper parameters and the nonlinear step-by-step analysis considering the incorporation of the definitive fluid viscous dampers were investigated in order to compare the seismic responses as a function of the earthquake nature and stay cable layout, taking into account the same earthquake events before mentioned. <br/><br/>Results of this investigation show that application of fluid viscous dampers as additional passive energy dissipation systems is a very efficient strategy to increase the damping of a structure, absorbing a significant amount of the seismic input energy, and controlling the seismic response of long-period structures, mainly in the longitudinal direction, where the main responses occur. More than 55% of the input energy can be dissipated with these devices, being equally efficient for far-fault and near-fault ground motions, independent on the stay cable layout, which constitutes a very promising strategy to protect cable-stayed bridges against earthquakes. Because of the highly nonlinear behaviour of those structures, response spectrum analysis must be considered only as first approach to the seismic response and for comparative purposes. For more accurate analysis results, and for design applications, nonlinear time-history analysis is a necessary choice. Likewise, it is demonstrated that the effect of the stay cable layout on the nonlinear seismic response of the bridges is not very important, as well as an important increase of the seismic response when forward rupture directivity pulse effects are considered, a characteristic of near-source ground motions.
2
Anderson, Brian. "Development of a non-Newtonian latching device." Thesis, Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3855.
Full text
3
COSTOLI, IACOPO. "Criteri di progetto e casi applicativi di miglioramento sismico di edifici con struttura a telaio mediante controventi dissipativi includenti smorzatori fluido-viscosi." Doctoral thesis, Università degli Studi di Trieste, 2022. http://hdl.handle.net/11368/3032058.
Full textAbstract:
This dissertation was aimed at revisiting and integrating energy-based design criteria of dissipative bracing systems incorporating fluid-viscous spring-dampers as protective devices, for the seismic retrofit of frame structures.
This objective was pursued by means of two main contributions. The first one concerned the introduction of an additional pre-sizing criterion of these systems aimed at guaranteeing a prompt activation of the spring-dampers starting from the early stages of the seismic response of the buildings where they are installed. The second one consisted in the evaluation of the influence of masonry infills and partitions in the assessment analysis in current state of the examined buildings, as well as in their verification analysis in retrofitted conditions, in order to evaluate the pre and post-intervention seismic performance of these non-structural elements, and the correlation with the response of the frame skeleton members.
For this second objective, a no-tension strut model with multilinear “pivot”-type hysteretic behaviour was adopted as substitute element for the infill and partition panels. A trilinear axial force-displacement backbone curve was generated for the equivalent struts, and transformed in the lateral force-drift curve of the panels. The latter was then scanned in terms of sequential performance limits and ranges, so as to accurately follow the damage evolution in the panels.
By collecting the results of the activity carried out during the Doctorate, this dissertation was written by presenting and discussing criteria and models, after short introductory notes, directly with the application to a series of demonstrative case studies concerning real buildings with different characteristics. This allowed substantiating the conceptual aspects of the examined topics with their practical implementation and possible use for other scholars and professional engineers operating in the same fields of interest.<br>This dissertation was aimed at revisiting and integrating energy-based design criteria of dissipative bracing systems incorporating fluid-viscous spring-dampers as protective devices, for the seismic retrofit of frame structures.
This objective was pursued by means of two main contributions. The first one concerned the introduction of an additional pre-sizing criterion of these systems aimed at guaranteeing a prompt activation of the spring-dampers starting from the early stages of the seismic response of the buildings where they are installed. The second one consisted in the evaluation of the influence of masonry infills and partitions in the assessment analysis in current state of the examined buildings, as well as in their verification analysis in retrofitted conditions, in order to evaluate the pre and post-intervention seismic performance of these non-structural elements, and the correlation with the response of the frame skeleton members.
For this second objective, a no-tension strut model with multilinear “pivot”-type hysteretic behaviour was adopted as substitute element for the infill and partition panels. A trilinear axial force-displacement backbone curve was generated for the equivalent struts, and transformed in the lateral force-drift curve of the panels. The latter was then scanned in terms of sequential performance limits and ranges, so as to accurately follow the damage evolution in the panels.
By collecting the results of the activity carried out during the Doctorate, this dissertation was written by presenting and discussing criteria and models, after short introductory notes, directly with the application to a series of demonstrative case studies concerning real buildings with different characteristics. This allowed substantiating the conceptual aspects of the examined topics with their practical implementation and possible use for other scholars and professional engineers operating in the same fields of interest.
4
GIOIELLA, LAURA. "External Dissipative Rocking System." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245410.
Full textAbstract:
Questa tesi ha l'obiettivo di indagare il comportamento dinamico e sismico di edifici esistenti protetti con un sistema esterno di dissipazione basato sul rocking; esso è costituito da una struttura reticolare in acciaio, incernierata a livello di fondazione, il cui movimento oscillante attiva la dissipazione di energia, per mezzo di smorzatori viscosi situati alla base. Nell'ipotesi di comportamento elastico lineare sia del telaio, che della struttura dissipativa, vengono presentate l'equazione del moto del sistema accoppiato ed una generalizzazione del sistema ad un grado di libertà. Per risolvere il problema dinamico è possibile condurre analisi sia nel dominio del tempo, che in quello delle frequenze.
La soluzione nel dominio del tempo si basa su una formulazione alle variabili di stato che, tramite analisi modale complessa del sistema telaio da proteggere-struttura esterna di protezione passiva, permette di valutare l'influenza, sia sul comportamento dinamico che in termini di risposta sismica, dello smorzamento e della linearizzazione degli spostamenti forniti dalla struttura dissipativa. In particolare, la formulazione proposta, consente di valutare separatamente il contributo di ciascuno dei modi di vibrazione complessi del sistema sulla risposta sismica globale. Le analisi armoniche nel dominio delle frequenze, invece, sono particolarmente utili in quanto consentono di lavorare con un sistema algebrico piuttosto che differenziale. Inoltre, scegliendo di rappresentare l'input sismico come un processo stocastico stazionario, è possibile stabilire una relazione tra la densità spettrale di potenza (PSD) dell'input esterno e quella dei parametri di risposta di interesse, tramite analisi armonica del sistema.
Le prestazioni di due casi di studio sono valutate mediante analisi parametriche, riguardanti diversi livelli di smorzamento e rigidezza del sistema di protezione, sia con analisi nel tempo che in frequenza. Infine vengono presentati alcuni aspetti che necessitano di ulteriore approfondimento. Tra di essi la valutazione ed il confronto della performance sismica di smorzatori viscosi a comportamento lineare e non, dimensionati attraverso il criterio di uguaglianza dell'energia dissipata. Le prestazioni del sistema di protezione passiva indagato, vengono confrontate con un'altra configurazione esterna, che prevede l'accoppiamento del telaio con una struttura rigida di contrasto, nota in letteratura come sistema di smorzamento proporzionale alle masse. Infine viene condotta una prima analisi degli effetti dell'interazione terreno-struttura (SSI), mediante l'approccio alle sottostrutture.<br>In this thesis the seismic performance of existing buildings frames coupled with an external dissipative rocking system is investigated; the arrangement consists of a steel truss, hinged at the foundation level, whose rocking motion promotes the dissipation of energy via viscous dampers located at the base. Under the assumption of linear elastic behaviour of both the frame and the dissipative structure, the equation of motion of the system are presented, together with a generalized Single Degree of Freedom (S-DOF) approximation of the system. This way, analysis through time-domain and frequency-domain are allowed for the investigation of the system dynamic behaviour.
Time-domain analysis, based on a state space approach, leads to the complex modal analysis of the coupled system, which allows the evaluation of the influence of the added damping and of the displacements linearization, promoted by the external dissipative rocking system, on both the dynamic behaviour and the seismic response. In particular, the proposed formulation permits to evaluate separately the contribution of each of the complex vibration modes of the system to the global seismic response. On the other hand frequency-domain analysis is particularly useful for the problem under investigation because it allows to work with an algebraic system rather than a differential one. Furthermore by representing the seismic input in terms of a stationary stochastic process, a relation can be established between the Power Spectral Density (PSD) of the input and that of the response parameters of interest via harmonic analysis of the system.
The performance of two case studies is evaluated by means of parametric analysis, involving added damping and stiffness, either through time- and frequency-domain. Finally, some aspects which need a deeper investigation are presented. Among them the evaluation and comparison between linear and non-linear fluid viscous dampers, dimensioned through dissipated energy criterion. The performance of the analyzed dissipative system, is compared with an alternative retrofitting configuration, consisting in the coupling with external stiff contrasting structure, known in literature as mass proportional damping system. At the end a first insight on the effects of Soil-Structure-Interaction (SSI), through the substructure approach, is provided.
5
Caceres-Perez, Gladys, Natali Pichihua-Alata, and Guillermo Huaco-Cardenas. "Seismic Retrofit in Hospitals using Fluid Viscous Dampers." Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656409.
Full textAbstract:
El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.<br>The addition of fluid viscous dampers to structures increases damping and reduce the lateral displacements due large earthquake loads, being an effective technique for seismic control of responses specially by severe earthquakes events and structures at high seismic hazard zone, safeguarding them from possible collapse. The objective of this research is to compare the structural performance of essential structures of confined masonry older than 50 years, asbuilt and retrofitted with viscous dampers. Additionally, the structure is analyzed with a traditional reinforcement technique such as reinforced concrete walls, in order to evaluate the feasibility of the first proposal. It was found that including dampers the drifts are reduced from 0.6% to its half, better performance that implementing concrete walls with 0.45% drift response. Besides stresses levels at masonry walls have been reduced better than retrofit building new concrete walls. It is shown the feasibility of the proposal in structural responses using fluid viscous dampers,
6
Gobbo, Giuseppe Del. "Placement of fluid viscous dampers to reduce total-building seismic damage." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:29da2030-ff4e-4435-ad29-5855e503e05f.
Full textAbstract:
Nonstructural damage has been found to critically influence economic losses and building downtime following earthquakes. Attaining a target level of seismic performance mandates the harmonisation of structural and nonstructural performance. Retrofitting buildings with fluid viscous dampers (FVDs) can improve interstorey drifts and floor accelerations, parameters which characterise seismic demands. The distribution of dampers within a building and the amount of supplemental damping are critical decisions. Many placement methods have been proposed, however no conclusive optimal method has been identified. The objectives of the thesis included benchmarking the performance of code-compliant buildings, investigating the optimal amount of damping, and comparing major damper placement methods. The seismic performance of Eurocode-compliant concentric braced frame buildings was benchmarked. Structures were modelled in OpenSees and the FEMA P-58 procedure was used to assess seismic performance in repair costs, a comprehensive measure of total-building performance. Buildings may be demolished following an ultimate limit state earthquake due to high repair costs. Storeys satisfying the Eurocode drift limit for nonstructural protection nevertheless experienced drift- and acceleration-sensitive damage. Most damage was attributed to nonstructural systems. Acceleration-sensitive damage is of comparable or greater consequence than drift-sensitive damage. These findings should be more appropriately reflected in structural design procedures. The optimal amount of damping to minimise repair costs was identified as 30-40%, larger than previously suggested levels based on structural parameters. Six damper placement methods were evaluated using linear FVDs. No method produced optimal results for both drifts and accelerations. Iterative methods that purport to optimise performance did not achieve that objective: local rather than global parameters are considered, and optimising for a single parameter may worsen another that impacts damage. The storey shear strain energy method and uniform damping produced repair costs more favourable than, or equal to, the other placement methods. Damper placement optimisation may be successful for high-rise or irregular structures.
7
Tell, Sarah. "Vibration mitigation of high-speed railway bridges : Application of fluid viscous dampers." Licentiate thesis, KTH, Bro- och stålbyggnad, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-205672.
Full textAbstract:
At the moment of writing, an expansion of the Swedish railway network has started, by constructions of new lines for high-speed trains. The aim is to create a high-speed connection between the most populous cities in Sweden - Stockholm, Göteborg and Malmö, and the rest of Europe. Thereby, the likelihood of faster, longer and heavier foreign trains crossing the Swedish lines is increased. However, this could be problematic since the dynamic response in railway bridges and, consequently, the risk of resonance increases with increasing train speeds. Bridges are usually designed based on contemporary conditions and future requirements are rarely considered, due to e.g. cost issues. Prospectively, the dynamic performance of existing bridges may become insufficient. Hence, the current expansion of the high-speed railway network results in an increased demand of innovative design solutions for new bridges and cost-efficient upgrading methods for existing lines. The aim of the present thesis is to propose a vibration mitigation strategy suitable for new and existing high-speed railway bridges. The main focus is a retrofit method with fluid viscous dampers installed between the bridge superstructure and the supports, which is intended to reduce the vertical bridge deck acceleration below the European design code limits. Furthermore, the intention is to investigate the efficiency of such a system, as well as to identify and analyse the parameters and uncertainties which could influence its functionality. In order to examine the applicability of the proposed retrofit, case studies, statistical screenings and sensitivity analyses are performed and analysed. Two different models, a single-degree-of-freedom system and a finite element model, are developed and compared. From the different models, it is possible to study the influence from the damper parameters, the variability of the material properties and different modelling aspects on the bridge response. After the installation of the fluid viscous dampers, it is found that the acceleration level of the bridge deck is significantly reduced, even below the design code requirements.<br>I skrivande stund har en utbyggnad av det svenska järnvägsnätet initierats. Målet är att skapa en höghastighetsanslutning mellan de folkrikaste städerna i Sverige - Stockholm, Göteborg och Malmö, och vidare ut i Europa. Därmed ökar sannolikheten att snabbare, längre och tyngre utländska tåg korsar de svenska järnvägslinjerna. Dock kan detta bli problematiskt i och med att järnvägsbroars dynamiska respons och, följaktligen, risken för resonans ökar med ökad tåghastighet. Broar dimensioneras ofta utifrån nuvarande förutsättningar och hänsyn tas sällan till framtida hållbarhetskrav, exempelvis p.g.a. kostnadsbesparingar. Ur ett framtidsperspektiv kan därför det dynamiska beteendet hos befintliga broar komma att bli otillräckligt. Utbyggnaden av höghastighetsnätverket ökar därmed behovet av innovativa konstruktionslösningar för nya broar och kostnadseffektiva uppgraderingsmetoder för befintliga sträckor. Syftet med föreliggande avhandling är att föreslå en metod för att minska de vibrationsnivåer som kan uppstå i både nybyggda och befintliga järnvägsbroar för höghastighetståg. Huvudfokus är en eftermonteringsmetod med viskösa dämpare, som har installerats mellan brons överbyggnad och landfästen, för att minska brobanans vertikala acceleration under gällande europeiska dimensioneringskrav. Vidare avses att undersöka effektiveteten av ett sådant system, samt att identifiera och analysera de parametrar och osäkerheter som kan påverka dess funktionalitet. Fall- och parameterstudier, samt statistiska metoder används och utvärderas för att undersöka tillämpbarheten av den föreslagna vibrationsdämpningsmetoden. Två olika modeller, ett enfrihetsgradssystem och en finit elementmodell, har skapats och jämförts. Utifrån dessa modeller kan påverkan av dämparens parametrar, variabiliteten hos materialegenskaperna och behandlingen av olika modelleringsaspekter studeras. Från resultaten är det tydligt att brobanans accelerationsnivå avsevärt reduceras efter monteringen av viskösa dämpare, till och med under dimensioneringskraven.<br><p>QC 20170425</p>
8
Brienza, Giampietro. "Analisi di risposta sismica locale e protezione sismica degli edifici: applicazione di FVD nella progettazione dell'ampliamento del Maria Cecilia Hospital di Cotignola (RA)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21054/.
Full textAbstract:
E’ stato indagato il comportamento degli edifici equipaggiati con un sistema di protezione sismica passivo basato sull’utilizzo di dissipatori fluido viscosi non lineari.
L’elaborato vede una prima parte nella quale si individuano i metodi per lo svolgimento dell’analisi di risposta sismica locale.
La seconda parte si concentra sui metodi di protezione sismica degli edifici e in particolare sul controllo dello smorzamento con dissipatori fluido viscosi. Ne è stato studiato il comportamento meccanico e sono stati analizzati i criteri di progettazione ed integrazione all’interno del sistema strutturale.
L’ultima parte della presente tesi, svolta in collaborazione con lo Studio Tassinari e Associati di Ravenna, raccoglie le elaborazioni ed i risultati ottenuti dall’applicazione degli aspetti presentati nelle precedenti parti alla progettazione dell’ampliamento previsto per il complesso ospedaliero di Maria Cecilia Hospital di Cotignola (RA) del Gruppo Villa Maria. E’ stato sviluppato il confronto in termini di danni attesi a seguito di sisma e di costo di realizzazione tra diverse strategie progettuali: con dissipatori, a comportamento dissipativo e a comportamento non dissipativo. I risultati ottenuti con i metodi di predimensionamento sono stati verificati attraverso analisi dinamiche non lineari con impiego di storie temporali, come previsto dalla normativa vigente.
I risultati hanno fornito una soluzione strutturale con dissipazione aggiuntiva vantaggiosa dal punto di vista della sicurezza degli elementi strutturali e non strutturali, che comporta un investimento poco superiore alla soluzione tradizionale. Il vantaggio rilevante è che a seguito di sisma non sono previsti danni e plasticizzazioni agli elementi strutturali inoltre la riduzione delle accelerazioni e degli spostamenti ai quali si sottopone la costruzione permette di salvaguardare gli elementi non strutturali e, aspetto fondamentale nell’ambito di strutture sanitarie e di ricerca, i contenuti.
9
Sambuc, Clément. "Refined damped equivalent fluid models for acoustics." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209144.
Full textAbstract:
The acoustics of small cavities raises interest of the scientific community since it involves particular damping mechanisms. In fluid dynamics, when a small perturbation is propagating within a Newtonian and heat-conducting fluid bounded by a rigid and isothermal surface, viscous and thermal dissipative mechanisms are generated near the walls. Such effects can have significant impact on the acoustic behaviour of the system.<p>Several types of practical applications can be cited, among which: hearing aids, micro-electro-mechanical systems (transducers, microphones and loud-speakers), absorbing materials made of thin capillary nets or small pores, dissipative silencers, thermo-acoustic heat exchangers, or any kind of device bringing into play small resonant cavities filled with a dissipative fluid (micro-acoustics).<p><p>This study focuses on appropriated reductions of the physical equations, in order to enhance the efficiency of the numerical resolution without adversely affecting the accuracy. Moreover, the proposed strategies lead to numerically stable systems as they involve only one scalar partial order differential equation (or equivalent fluid equation). The emphasis is put on the physical aspect of those reductions, their range of applicability, benefits and drawbacks.<p>Two new reduced models are proposed to estimate the visco-thermal acoustic wave propagation. A first extension deals with waveguide geometries and relax the hypothesis of the fluid at rest. The second original formulation addresses visco-thermal acoustics in 3D arbitrary geometries. This model is based on different considerations coming from existing techniques as well as the estimation of a wall-distance field.<p><p>A second part aims at studying the acoustic behaviour of biphasic materials and more specifically poro-elastic materials. This type of acoustic component is widely used in industry because of their good absorbing properties in the medium- and high-frequency <p>ranges.<p>A preliminary bibliographic research deals with the derivation of the set of partial order differential equations that account for both fluid/structure interactions and the anisotropy of a given poro-elastic material. It has been shown that transversely orientated capillary materials (for instance catalyst substrates) can be simulated using the proposed reduction technique.<p>At last, the modelling of the acoustic transmission between two domains separated by perforated or micro-perforated plates or thin plates of poro-elastic materials is discussed. The analogy between the rigid perforated plate models with an equivalent fluid formulation has been presented. As a result, this model has been extended in order to account for flexural effects of the solid part.<p><p><p>Ce travail porte sur l'étude de certains phénomènes d'amortissements intervenant dans l'acoustique des petites cavités. En méchanique des fluides, lorsqu'une petite perturbation se propage au sein d'un fluide newtonien et caloporteur borné par un mur rigide et isotherme, ces mécanismes dissipatifs particuliers se localisent aux abords des parois et jouent un rôle significatif dans certaines situations.<p>Parmi les exemples d'applications pratiques, il est possible de citer les appareils d'aide auditive, les systèmes microélectromécaniques (transducteurs, microphones et haut-parleurs), les matériaux absorbants constitués de fins réseaux capillaires ou de pores aux dimensions réduites, les systèmes de silencieux, d'échangeurs de chaleur thermo-acoustiques ou tout autre appareil mettant en jeu des cavités résonantes aux dimensions réduites (micro-acoustique).<p><p>L'étude proposée ici se focalise sur des stratégies de réduction appropriées des équations physiques, ceci afin d'améliorer l'efficacité du modèle tout en conservant une précision acceptable. Les techniques présentées aboutissent à des systèmes numériquement stables mettant en jeu une seule équation scalaire (ou équation fluide équivalent). Ainsi, l'accent est porté sur l'aspect physique des réductions, leurs domaines d'application, avantages et inconvénients.<p>Deux modèles originaux sont proposés afin de prédire la propagation acoustique visco-thermique. Une première extension permet d'évaluer la pression acoustique au sein de géométries particulières de type guides d'onde en présence d'un écoulement hydrodynamique. La seconde formulation présentée s'intéresse à l'acoustique dans des domaines 3D arbitraires. Cette méthode se base sur des considérations conjointes de modèles réduits existants ainsi que sur l'estimation d'un champ de distance à la plus proche paroi.<p><p>Dans une seconde partie, nous nous proposons d'étudier le comportement acoustique de matériaux biphasique et plus précisément les matériaux poro-élastiques (très utilisés dans l'industrie en raison de leurs caractéristiques absorbantes dans les domaines des moyennes et hautes fréquences).<p>Une étude bibliographique préliminaire nous a permis d'exprimer l'ensemble des équations aux dérivées <p>partielles modélisant à la fois les interactions fluide/structure et l'anisotropie générale des matériaux. <p>Cette réflexion nous a permis d'aboutir à un modèle de matériau isotrope transverse intéressant, combinant le modèle fluide proposé et la formulation acousto-élastique équivalente. Ainsi la modélisation de structures capillaires orientées (comme les matériaux utilisés dans les catalyseurs automobiles) s'en trouve grandement simplifiée.<p>Enfin, la transmission acoustique intervenant entre deux domaines fluides séparés par une plaque perforée ou micro-perforée ou bien une couche de matériau poreux a été étudiée. L'analogie entre les modèlisations existantes et un modèle générique de fluide équivalent a été mise en évidence. Pour finir, cette formulation a été étendue afin de prendre en compte les effets de flexion de la partie solide.<br>Doctorat en Sciences de l'ingénieur<br>info:eu-repo/semantics/nonPublished
10
Kalyanam, Sujatha. "Optimal design of passive fluid viscous dampers for controlling vibrations in seismically-excited truss towers." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-05112009-031200/.
Full textAbstract:
Thesis (M.S.)--Florida State University, 2009.<br>Advisor: Michelle Rambo-Roddenberry, Florida State University, College of Engineering, Dept. of Civil and Environmental Engineering. Title and description from dissertation home page (viewed on Oct. 27, 2009). Document formatted into pages; contains viii, 61 pages. Includes bibliographical references.
Books on the topic "Fluid viscous damper"
1
Highway Innovative Technology Evaluation Center (U.S.) and Civil Engineering Research Foundation, eds. Evaluation findings for Taylor devices fluid viscous damper. American Society of Civil Engineers, 1998.
Find full text
2
Black, Cameron J. Viscous heating of fluid dampers under wind and seismic loading: Experimental studies, mathematical modeling and design formulae. Dept. of Civil and Environmental Engineering, University of California, 2005.
Find full text
3
Black, Cameron J. Viscous heating of fluid dampers under wind and seismic loading: Experimental studies, mathematical modeling and design formulae. Dept. of Civil and Environmental Engineering, University of California, 2005.
Find full text
4
Black, Cameron J. Viscous heating of fluid dampers under wind and seismic loading: Experimental studies, mathematical modeling and design formulae. Dept. of Civil and Environmental Engineering, University of California, 2005.
Find full text
5
ARORA, Er Sahil, and Amanullah KHANZADA. Optimization of Bracing,viscous Damper and Comparison of Fluid Viscous Damper Andbracing System for Stabilization of High Rise Building. Independently Published, 2019.
Find full text
6
Kuckian, Sachin. Study on Seismic Response of Reinforced Structures Retrofitted with Fluid Viscous Dampers in Shear Walls. GRIN Verlag GmbH, 2019.
Find full textBook chapters on the topic "Fluid viscous damper"
1
Li, Aiqun. "Viscous Fluid Damper." In Vibration Control for Building Structures. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40790-2_5.
Full text
2
Patil, Basanagouda I., Bapugouda B. Biradar, and Rashmi Doddamani. "Mitigation of Seismic Pounding Observed in Adjacent Buildings with Fluid Viscous Damper." In Lecture Notes in Civil Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2826-9_45.
Full text
3
Dey, Rini, and Purnachandra Saha. "Seismic Response Control of Smart Base-Isolated Benchmark Building Using Hybrid Control Strategy (Viscous Fluid Damper with MR Damper)." In Lecture Notes in Civil Engineering. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0365-4_31.
Full text
4
Pigouni, A. E., R. Borella, S. Infanti, and M. G. Castellano. "Fluid Viscous Dampers for the 1915 Çanakkale Bridge in Turkey." In Lecture Notes in Civil Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-21187-4_40.
Full text
5
Idels, Ohad, and Oren Lavan. "Design of Irregular Frames with Fluid Viscous Dampers Using Optimization." In Seismic Behaviour and Design of Irregular and Complex Civil Structures IV. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-83221-6_11.
Full text
6
Castellano, Maria Gabriella, A. E. Pigouni, L. Marcolin, and S. Infanti. "Seismic Isolation of Hospitals Through Fluid Viscous Dampers Combined with Isolators." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-66888-3_29.
Full text
7
Sebaq, Mohammed Samier, and Ying Zhou. "Maxwell Model of Fluid Viscous Dampers in Elastic and Inelastic SDOF Systems." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-3362-4_39.
Full text
8
Constantinou, M. C. "Principles of Friction, Viscoelastic., Yielding Steel and Fluid Viscous DAMPERS: Properties and Design." In Passive and Active Structural Vibration Control in Civil Engineering. Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-3012-4_10.
Full text
9
Mociran, H. "Seismic performance of dual eccentrically braced steel frames equipped with fluid viscous dampers." In Insights and Innovations in Structural Engineering, Mechanics and Computation. CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-45.
Full text
10
Idels, Ohad, and Oren Lavan. "Seismic Design of Steel Moment Resisting Frames with Fluid Viscous Dampers Using Optimization." In Lecture Notes in Civil Engineering. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-03811-2_77.
Full textConference papers on the topic "Fluid viscous damper"
1
Han, Ming, Junning Cui, Mingrui Jin, Bo Kang, and Yamin Zhao. "Dynamic Analysis of Viscous Fluid Damper Under Low-Frequency Micro-Vibration with Fluid Compressibility." In 2024 Academic Conference of China Instrument and Control Society (ACCIS). IEEE, 2024. https://doi.org/10.1109/accis62068.2024.10948641.
Full text
2
Seng, Chanroatanak, Xin Zhao, and Chornay Morn. "Comparative Investigation of Pressure-Adjustment Fluid Viscous Damper Performance Under Moderate and High Seismic Intensity." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.2294.
Full textAbstract:
<p>Tall buildings are typically vulnerable to the effects of lateral deformation caused by earthquakes and wind excitation. Thus, lateral displacement frequently affects the structural performance of the system. Building dissipates the energy through its lateral stiffness. Inadequate lateral stiffness may result in severe damage to non-structural components or cause the system to collapse. Large structural elements are needed to provide the necessary stiffness for the slender designs of high- rise buildings, which can result in an uneconomic design. Tall building can counter this issue by applying energy dissipation technology, which reduces the seismic responses of main structures and realizes an optimal structural design for the main structure. This study compares the effectiveness of uncontrolled structure, pressure adjustment fluid viscous dampers (PA-FVD), and traditional fluid viscous dampers (FVD) in mitigating structural responses during seismic events. This study evaluates each system’s performance under various level of seismic excitation, ranging from moderate to high intensity.</p>
3
Quiaem, Megan Angela, Rodolfo Mendoza Jr., and Demin Feng. "Enhancing the seismic performance of offshore marine platforms using passive devices." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.2267.
Full textAbstract:
<p>Nonlinear dynamic analysis was used to evaluate the effectiveness of energy dissipation devices in mitigating lateral displacements and enhancing the overall seismic performance of offshore platforms. The energy dissipation capability of the buckling restrained braces (BRB) and viscous fluid dampers (VFD) were compared at different installation angles, namely 30, 45, and 60 degrees, to determine the most efficient orientation. Two platform models, each installed with a different passive device, were subject to seismic inputs from seven selected historical ground motion records, and the resulting displacement demand was compared against a control model with no installed energy dissipation system. It was found that the reduction of lateral displacement in the model installed with BRB was greater than that of the model with VFD when compared against the control model, and that the most efficient orientation for the installation of passive devices is 60 degrees.</p>
4
SONG, Dan-Feng, and Yong-Jin LU. "Research and Development of Mechanically Adjustable Fluid Viscous Damper." In 3rd International Conference on Material Engineering and Application (ICMEA 2016). Atlantis Press, 2016. http://dx.doi.org/10.2991/icmea-16.2016.92.
Full text
5
Tang, Liang, Jinli Li, Yonglan Xie, and Zhen Tian. "Experimental Research on Dynamic Performance of Viscous Fluid Damper." In 2021 4th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA). IEEE, 2021. http://dx.doi.org/10.1109/isttca53489.2021.9654526.
Full text
6
Peiwei, OU, Min Wei, and Wang Dong. "The damping algorithm and design of viscous damper." In 2019 IEEE 8th International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2019. http://dx.doi.org/10.1109/fpm45753.2019.9035913.
Full text
7
Zheng, Jiajia, Zhaochun Li, and Jiong Wang. "Heating of Long-Stroke Magnetorheological Fluid Damper." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62604.
Full textAbstract:
Magnetorhelogical (MR) dampers are gradually used in military devices for shock isolation and civil structures for suppressing earthquake-induced shaking and wind-induced vibrations because of their mechanical simplicity, high dynamic range, low power requirements, large force capacity and robustness. Since MR fluid dampers are energy-dissipating device, the issues of heat generation and dissipation is important. In this study, phenomenon of viscous heating and consequent temperature increase in a long-stroke MR damper are presented. In addition, a theoretical model is developed which predicts the temperature increase in the long-stroke MR damper. This model is solved numerically and a new coupling method was proposed to analyze the electromagnetic-thermal coupling problem on the basis of the mechanism of coupled field. Aim at the high frequency of piston head moving back and forth, as well as the changing current, the simulation model is established. The results show that the temperature effect on the damping force is significant and provide a theoretical basis and calculation method for the design and analysis of long-stroke MR damper.
8
Gioiella, Laura, Fabrizio Scozzese, Enrico Tubaldi, Laura Ragni, and Andrea Dall'Asta. "AN ADVANCED MODEL FOR THE FLUID VISCOUS DAMPER BRITTLE FAILURE." In 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Institute of Structural Analysis and Antiseismic Research National Technical University of Athens, 2021. http://dx.doi.org/10.7712/120121.8758.18946.
Full text
9
Pecinka, Ladislav, Pavel Zakovec, and Frank Barutzki. "Assessment of the Temperature Field of the Viscous Damper GERB Type VES 40/40/40." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77302.
Full textAbstract:
GERB pipework viscous dampers are highly effective viscous – elastic elements. The stiffness and damping coefficients of these ones are strongly dependent on the working temperature of the fluid. It is a crucial problem of nuclear power plants if viscous dampers are installed inside the hermetic zone. Circulation of the air due to ventilation system represents either heating or cooling of the damper surface and finally can influenced, the damper reliability. This problem has been solved for the Armenian NPP Metsamor. Results are presented.
10
Liu, Gaoyu, Fei Gao, and Wei-Hsin Liao. "Magnetorheological Damper With Micro-Grooves: Design and Experiment." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2307.
Full textAbstract:
Abstract Due to low power consumption and fast response, magnetorheological (MR) dampers are widely used in various engineering applications. To enhance the performances, efforts have been made to increase the field dependent force with the same power consumption. However, the fluid viscous force is also increased significantly, which is undesirable in practical use. To tackle this problem, the focus of this paper is to design and test a new MR damper with micro-grooves for performance enhancement. First, the detailed design of the proposed MR damper is provided. A prototype of the new MR damper is fabricated. Silicon steel circular rings with thickness of 0.25 mm are installed around the damper piston to form two-layer micro-grooves. Experimental results of the two MR dampers without and with micro-grooves are then compared. The advantages of MR damper with micro-grooves over the one without micro-grooves are validated. The damping force and controllable force range of MR damper with micro-grooves are larger than the one without micro-grooves. When designing MR damper, making micro-grooves can also decrease the increment of fluid viscous force while keeping the same increase of field dependent force. With micro-grooves, the field dependent force is increased by 92.7% with the same power consumption, while the fluid viscous force is increased by 43%.
Reports on the topic "Fluid viscous damper"
1
Lokke, Arnkjell, and Anil Chopra. Direct-Finite-Element Method for Nonlinear Earthquake Analysis of Concrete Dams Including Dam–Water–Foundation Rock Interaction. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2019. http://dx.doi.org/10.55461/crjy2161.
Full textAbstract:
Evaluating the seismic performance of concrete dams requires nonlinear dynamic analysis of two- or three-dimensional dam–water–foundation rock systems that include all the factors known to be significant in the earthquake response of dams. Such analyses are greatly complicated by interaction between the structure, the impounded reservoir and the deformable foundation rock that supports it, and the fact that the fluid and foundation domains extend to large distances. Presented in this report is the development of a direct finite-element (FE) method for nonlinear earthquake analysis of two- and three-dimensional dam–water–foundation rock systems. The analysis procedure applies standard viscous-damper absorbing boundaries to model the semi-unbounded fluid and foundation domains, and specifies at these boundaries effective earthquake forces determined from a ground motion defined at a control point on the ground surface. This report is organized in three parts, with a common notation list, references, and appendices at the end of the report. Part I develops the direct FE method for 2D dam–water–foundation rock systems. The underlying analytical framework of treating dam–water–foundation rock interaction as a scattering problem, wherein the dam perturbs an assumed "free-field" state of the system, is presented, and by applying these concepts to a bounded FE model with viscous-damper boundaries to truncate the semi-unbounded domains, the analysis procedure is derived. Step-by-step procedures for computing effective earthquake forces from analysis of two 1D free-field systems are presented, and the procedure is validated by computing frequency response functions and transient response of an idealized dam–water–foundation rock system and comparing against independent benchmark results. This direct FE method is generalized to 3D systems in Part II of this report. While the fundamental concepts of treating interaction as a scattering problem are similar for 2D and 3D systems, the derivation and implementation of the method for 3D systems is much more involved. Effective earthquake forces must now be computed by analyzing a set of 1D and 2D systems derived from the boundaries of the free-field systems, which requires extensive book-keeping and data transfer for large 3D models. To reduce these requirements and facilitate implementation of the direct FE method for 3D systems, convenient simplifications of the procedure are proposed and their effectiveness demonstrated. Part III of the report proposes to use the direct FE method for conducting the large number of nonlinear response history analyses (RHAs) required for performance-based earthquake engineering (PBEE) of concrete dams, and discusses practical modeling considerations for two of the most influential aspects of these analyses: nonlinear mechanisms and energy dissipation (damping). The findings have broad implications for modeling of energy dissipation and calibration of damping values for concrete dam analyses. At the end of Part III, the direct FE method is implemented with a commercial FE program and used to compute the nonlinear response of an actual arch dam. These nonlinear results, although limited in their scope, demonstrate the capabilities and effectiveness of the direct FE method to compute the types of nonlinear engineering response quantities required for PBEE of concrete dams.