Gotowe bibliografie tematyczne / Mass dampers

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Gotowa bibliografia na temat „Mass dampers”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Mass dampers"

Parveen P, Sadha, i Anila S. "Seismic Analysis of RCC Buildings Using Water Tanks as Tuned Liquid Mass Dampers". Journal of Recent Activities in Architectural Sciences 8, nr 1 (10.05.2023): 20–28. http://dx.doi.org/10.46610/joraas.2023.v08i01.003.

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A Tuned Mass Damper (TMD) is a device that is mounted to a structure to reduce the dynamic response of the structure. It is made up of a mass, a spring, and a damper. The damper's frequency is tuned to a specific structural frequency, and when that frequency is excited, it will resonate in an opposite direction to the structural motion. Tuned Liquid Mass Dampers are more recommended when compared to Tuned Mass Damper due to their respective advantages. The overhead water tanks can act as Tuned Liquid Mass Dampers. In this study, the overhead water tanks in RCC buildings are used to represent liquid-tuned mass dampers. The impact of Multiple Liquid Tuned Mass Dampers on the RCC buildings with and without tuned liquid mass dampers is to be studied. Utilizing response spectrum analysis, the study was conducted on buildings that have hexagonal and rectangular shapes. The trials are repeated by changing the water levels in tanks to empty, one-third level, two-thirds level and full water tank conditions. Comparisons of seismic parameters are done for demonstrating the functionality of a tuned liquid mass damper.

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Papalou, A., i S. F. Masri. "Performance of Particle Dampers Under Random Excitation". Journal of Vibration and Acoustics 118, nr 4 (1.10.1996): 614–21. http://dx.doi.org/10.1115/1.2888343.

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An experimental and analytical study is made of the performance of particle dampers under wide-band random excitation. A small model, provided with a nonlinear auxiliary mass damper, was used to investigate the major system parameters that influence the performance of particle dampers: total auxiliary mass ratio, particle size, container dimension, and the intensity and direction of the excitation. It is shown that properly designed particle dampers, even with a relatively small mass ratio, can considerably reduce the response of lightly damped structures. An approximate analytical solution, which is based on the concept of an equivalent single unit-impact damper, is presented. It is shown that the approximate solution can provide an adequate estimate of the root-mean-square response of the randomly excited primary system when provided with a particle damper that is operating in the vicinity of its optimum range of parameters.

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Yadav, Ajay, Devangkumar Talaviya, Ankit Bansal i Mohit Law. "Design of Chatter-Resistant Damped Boring Bars Using a Receptance Coupling Approach". Journal of Manufacturing and Materials Processing 4, nr 2 (3.06.2020): 53. http://dx.doi.org/10.3390/jmmp4020053.

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Deep hole boring using slender bars that have tuned mass dampers integrated within them make the boring process chatter vibration resistant. Dampers are usually designed using classical analytical solutions that presume the (un)damped boring bar which can be approximated by a single degree of freedom system, and the damper is placed at the free end. Since the free end is also the cutting end, analytical models may result in infeasible design solutions. To place optimally tuned dampers within boring bars, but away from the free end, this paper presents a receptance coupling approach in which the substructural receptances of the boring bar modelled as a cantilevered Euler–Bernoulli beam are combined with the substructural receptances of a damper modelled as a rigid mass integrated anywhere within the bar. The assembled and damped system response thus obtained is used to predict the chatter-free machining stability limit. Maximization of this limit is treated as the objective function to find the optimal mass, stiffness and damping of the absorber. Proposed solutions are first verified against other classical solutions for assumed placement of the absorber at the free end. Verified models then guide prototyping of a boring bar integrated with a damper placed away from its free end. Experiments demonstrate a ~100-fold improvement in chatter vibration free machining capability. The generalized methods presented herein can be easily extended to design and develop other damped and chatter-resistant tooling systems.

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Štěpánek, Jan, i Jiří Máca. "OPTIMIZATION OF TUNED MASS DAMPERS ATTACHED TO DAMPED STRUCTURES - MINIMIZATION OF MAXIMUM DISPLACEMENT AND ACCELERATION". Acta Polytechnica CTU Proceedings 30 (22.04.2021): 98–103. http://dx.doi.org/10.14311/app.2021.30.0098.

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A tuned mass damper is a device, which can be highly helpful while dealing with dynamic behaviour of structures. Its proper design is conditioned by knowledge of both loading and the structure properties. In many cases, the structure can be represented by single degree of freedom model, which simplifies the design and optimization of tuned mass dampers. Most of studies focus only on minimization of displacement of the main structure under harmonic force load, however, in many cases, different frequency response function would be more appropriate. This paper presents an extension of design formulas for the H∞ optimization of tuned mass dampers for damped structures and various frequency response functions.

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Wang, Min, Yan Lin Zhang i Tao Zan. "Performance Optimization and Comparison of TMD, MTMD and DTMD for Machining Chatter Control". Advanced Materials Research 199-200 (luty 2011): 1165–70. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1165.

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This paper investigates and analyzes the performances of several types of tuned mass damper (TMD) including common single TMD(STMD), multiple tuned mass dampers (MTMD) and dual tuned mass dampers (DTMD) on the machining chatter control. Considering the special nature of the machining stability problem, the optimal design parameters of the dampers are defined as those that minimize the magnitude of the real part of the FRF of the damped machining system. This paper demonstrates the performance of the optimally designed different TMDs for machining stability improvement by calculating the stability diagrams for the turning processes. The calculation results show that a more than 60% improvement in the critical limiting cutting depth can be obtained for the optimally designed MTMD (2 TMDs) compared to the optimally designed STMD, and a more than20% improvement for the optimally designed DTMD compared to the optimally designed MTMD(2 TMDs).

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Rahman, Mohammad Sabbir, Md Kamrul Hassan, Seongkyu Chang i Dookie Kim. "Adaptive multiple tuned mass dampers based on modal parameters for earthquake response reduction in multi-story buildings". Advances in Structural Engineering 20, nr 9 (24.11.2016): 1375–89. http://dx.doi.org/10.1177/1369433216678863.

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The primary objective of this research is to find the effectiveness of an adaptive multiple tuned mass damper distributed along with the story height to control the seismic response of the structure. The seismic performance of a 10-story building was investigated, which proved the efficiency of the adaptive multiple tuned mass damper. Structures with single tuned mass damper and multiple tuned mass dampers were also modeled considering the location of the dampers at the top of the structure, whereas adaptive multiple tuned mass damper of the structure was modeled based on the story height. Selection of the location of the adaptive multiple tuned mass damper along with the story height was dominated by the modal parameters. Participation of modal mass directly controlled the number of the modes to be considered. To set the stage, a comparative study on the displacements and modal energies of the structures under the El-Centro, California, and North-Ridge earthquakes was conducted with and without various types of tuned mass dampers. The result shows a significant capability of the proposed adaptive multiple tuned mass damper as an alternative tool to reduce the earthquake responses of multi-story buildings.

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Inoue, Masanobu, Isao Yokomichi i Koju Hiraki. "Particle Damping with Granular Materials for Multi Degree of Freedom System". Shock and Vibration 18, nr 1-2 (2011): 245–56. http://dx.doi.org/10.1155/2011/309682.

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A particle damper consists of a bed of granular materials moving in cavities within a multi degree-of-freedom (MDOF) structure. This paper deals with the damping effects on forced vibrations of a MDOF structure provided with the vertical particle dampers. In the analysis, the particle bed is assumed to be a single mass, and the collisions between the granules and the cavities are completely inelastic, i.e., all energy dissipation mechanisms are wrapped into zero coefficient of restitution. To predict the particle damping effect, equations of motion are developed in terms of equivalent single degree-of-freedom (SDOF) system and damper mass with use made of modal approach. In this report, the periodic vibration model comprising sustained contact on or separation of the damper mass from vibrating structure is developed. A digital model is also formulated to simulate the damped motion of the physical system, taking account of all vibration modes. Numerical and experimental studies are made of the damping performance of plural dampers located at selected positions throughout a 3MDOF system. The experimental results confirm numerical prediction that collision between granules and structures is completely inelastic as the contributing mechanism of damping in the vertical vibration. It is found that particle dampers with properly selected mass ratios and clearances effectively suppress the resonance peaks over a wide frequency range.

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Ferreyra, María Victoria, Julián M. Gómez-Paccapelo, Ramiro Suarez i Luis A. Pugnaloni. "Avoiding chaos in granular dampers". EPJ Web of Conferences 249 (2021): 15003. http://dx.doi.org/10.1051/epjconf/202124915003.

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Granular dampers are passive devices used to attenuate mechanical vibrations. The most common configuration consists in an enclosure, partiallyfilled with particles, attached to the vibrating structure that needs to be damped. The energy is dissipated due to inelastic collisions and friction between the grains and between the grains and the inner walls of the container as the structure vibrates. As a result of the collisions, the mechanical response of the system often results in chaotic motion even if the driving is harmonic. Despite the vibration attenuation achieved, this chaotic response may render the granular damper unsuitable for a range of applications. In this work, we showcase two simple modifications of the enclosure design that are able to mitigate the chaotic response of the granular damper. To this end we use Discrete Element Method simulations of: (a) a granular damper with a conical base, and (b) a granular damper with obstaclesfixed inside the enclosure. We compare results against a standardflat-base enclosure damper. The basic mechanical response of the dampers is characterized by measuring the apparent mass and the loss factor. The suppression of the chaotic response is assessed qualitatively via the phase space diagram.

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Setareh, Mehdi. "Floor vibration control using semi-active tuned mass dampers". Canadian Journal of Civil Engineering 29, nr 1 (1.02.2002): 76–84. http://dx.doi.org/10.1139/l01-063.

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This paper discusses the application of a new class of semi-active tuned mass dampers, called ground-hook tuned mass dampers (GHTMD), for the reduction of floor vibrations due to human movements. The TMD introduced uses a continuously variable semi-active damper (ground-hook damper) to achieve reduction in the floor acceleration. Here, the GHTMD is applied to a single degree of freedom system representative of building floors. The GHTMD design parameters are defined in terms of non-dimensional values. The optimum values of these parameters are found based on the minimization of the acceleration response of the floor for different GHTMD mass ratios and floor damping ratios. The performance of the GHTMD is compared to that of the equivalent passive TMD. In addition, the effects of off-tuning due to variations in the mass ratios and frequency ratios of the TMD and GHTMD are studied. Comparison of the results demonstrates the efficiency and robustness of GHTMD with respect to equivalent TMD. Finally, a guide for the design of GHTMDs is presented.Key words: floor vibrations, semi-active tuned mass dampers, tuned vibration absorbers, vibration control, ground-hook dampers, human-induced vibrations, annoying vibrations, optimum design parameters.

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Khazaei, Mohsen, Reza Vahdani i Ali Kheyroddin. "Optimal Location of Multiple Tuned Mass Dampers in Regular and Irregular Tall Steel Buildings Plan". Shock and Vibration 2020 (16.09.2020): 1–20. http://dx.doi.org/10.1155/2020/9072637.

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Tuned mass dampers are one of the most common devices for the passive control of structures subjected to earthquakes. The structure of these dampers consists of three main parameters: mass, damping, and stiffness. Tuned mass dampers reduce the amplitude of the responses affecting on a mode. In most cases, only a single TMD (tuned mass damper) or a few dampers at several points above the building height are installed on the roof of the building, requiring considerable mass and space in some parts of the structure as overhead. It is also more important to predict the elements that will meet the required mass. In this research, the performance of multiple tuned mass dampers (MTMDs) is investigated in L- and U-shaped regular and irregular tall steel buildings with 10 and 20 floors, under the near- and far-field records. Nonlinear time history analysis is also applied to evaluate the multiple tuned mass dampers effects on the seismic responses of the structures. The SAP2000 API and MATLAB genetic algorithm are used to determine the optimal location of the MTMDs in the roof plans of the buildings. The results show the effects of multiple tuned mass dampers in reducing the seismic response of acceleration, displacement, and base shear up to 50, 40, and 40% in average, respectively. The results of determining the optimum location of MTMDs in the models indicate the importance of the symmetry of the dampers relative to the centre of mass of the building.

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Rozprawy doktorskie na temat "Mass dampers"

Ritchey, John Kenneth. "Application of Magneto-Rheological Dampers in Tuned Mass Dampers for Floor Vibration Control". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/35287.

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The purpose of this research is to establish the effectiveness of tuned-mass-dampers (TMD) using semi-active magneto-rheological (MR) dampers to mitigate annoying floor vibrations. Annoying floor vibration is becoming more common in today's building structures since building materials have become stronger and lighter; the advent of computers has resulted in "paperless" offices; and the use of floors for rhythmic activities, such as aerobics and concerts, is more common. Analytical and experimental studies were conducted to provide an understanding of the effects of incorporating the semi-active-TMD as a remedy to annoying floor vibration.

A pendulum tuned mass damper (PTMD) in which the tuning parameters could independently be varied was used. Closed form solutions for the response of the floor using passive dampers were developed. In addition, a numerical integration technique was used to solve the equations of motion where semi-active dampers are utilized. The optimum design parameters of PTMDs using passive and semi-active dampers were found using an optimization routine. Performances of the PTMD in reducing the floor vibration level at the optimum and when subjected to off-tuning of design parameters using passive and semi-active dampers were compared.

To validate the results obtained in the analytical investigation, an experimental study was conducted using an 8 ft x 30 ft laboratory floor and a commercial PTMD. Comparative studies of the effectiveness of the PTMD in reducing floor vibrations using semi-active and passive dampers were conducted.

Master of Science

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Tang, Ning. "Design of adjustable tuned mass dampers employing nonlinear elements". Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19727/.

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The work focuses on the design of the Tuned Mass Damper (TMD), targeted multi-mode, multi-directional vibrations of mechanical structures occurring over a wide temperature ranges. Extension of the target frequency range is achieved by making the devices adjustable, using components with nonlinear load-deflection behaviour. Two nonlinear components that are new in TMD design are studied, namely elastomeric O-rings and Tangled Metal Wire (TMW) particles. Evaluation of the performance of these devices on a typical engineering structure is carried out, and the feasibility of the proposed devices demonstrated. For the O-ring TMD, analytical models are developed to describe the load- deflection behaviour of the O-ring. An existing model for axial compression is improved while new models are established for shear and rocking deformations. Validation of the models is carried out using a specifically designed vibration test. Numerical models, aiming to estimate the elasticity of the O-rings with irregular cross-sectional shape, are developed and validated by comparison with the experimental results. The TMW particles seeks to address high temperature applications. The strong compression-dependent stiffness of these particles provides the basis for an adjustable TMD. Although there is some variation in the stiffness and damping for different collections of particles with similar physical properties, uniformity in- creases after several test runs. According to the assumptions of the equivalence of the TMW materials and the hyperelastic solid, a semi-empirical analytical model is developed and validated using experimental results. A novel design optimisation algorithm, based on the complex power approach, developed to provide an alternative route for the TMD involving nonlinear elements. The proposed route, involving the use of the a numerical, evolutionary search method, is finally applied to the design of a nonlinear TMD.

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Alhujaili, Fahad Abdulrahman. "Semi-Active Control of Air-Suspended Tuned Mass Dampers". University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1354480214.

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Almeida, Guilherme Mesquita de. "Aplicação de tuned-mass dampers para controle de vibrações em lajes". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-02122016-085411/.

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Esta dissertação propõe uma solução padronizada de aplicação de Tuned-Mass Damper (TMD) para controle de vibrações em lajes baseada na análise das características de carregamentos associados à utilização humana e nas características estruturais mais comuns à engenharia contemporânea. De modo a simplificar sua aplicação técnica, a sintonização é proposta por meio da escolha de componentes pré-determinados para a montagem do TMD e pela distribuição e posicionamento dos mecanismos. A eficácia do sistema é então verificada em um estudo de caso, usando um modelo de elementos finitos de uma laje, antes e depois da aplicação dos mecanismos.
This thesis proposes a standardized solution for the application of Tuned-Mass Dampers to the control of floor vibrations based on the characteristics of the acting loads associated to human usage and the characteristics of the most common structures of the contemporary engineering practice. In order to simplify its usage by the technical community, the tuning is proposed through the selection of pre-determined components for the assembly of the TMD and the choice of disposition and spacing of the mechanisms. The system efficacy is then verified in a computational case study, by means of a finite-element model of a floor, before and after the application of the mechanisms.

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Rottmann, Cheryl E. "The use of tuned mass dampers to control annoying floor vibrations". Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063455/.

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Chinien, Lomadeven Viken. "Design of multiple tuned mass dampers for mitigation of wind induced vibrations". Thesis, Imperial College London, 2000. http://hdl.handle.net/10044/1/11536.

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Lindh, Cory W. "Dynamic range implications for the effectiveness of semi-active tuned mass dampers". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/57884.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 159-164).
The response of tall buildings subjected to dynamic wind loads has been widely studied. For excitations approaching the resonant frequencies of the structure, ensuring serviceability is a significant concern. One traditional solution is the implementation of a tuned mass damper (TMD), which acts as a passive damping device in the region of the tuned frequency. However, TMDs exhibit a limited bandwidth and often require a significant mass. Active systems, such as the active mass driver, have been utilized to improve the effectiveness of the TMD concept, but these systems require significant power and bring the inherent risk of instability. Hybrid semi-active schemes with variable damping devices have been proposed. They are stable, require low power, and are controllable, thus providing a broader range of applicability. The concept of a semi-active tuned mass damper (STMD) has been investigated, but the influence of the dynamic range of the semi-active damping device has not been documented. This analysis assesses the effectiveness of STMD systems using a variable-orifice damper and a magnetorheological damper with varying dynamic ranges. Results demonstrate a performance dependence on the dynamic range and also elucidate the superiority of non-linear damping devices. It is shown that the prescribed TMD mass may be reduced by a factor of two when semi-active control is implemented, thereby making the STMD an attractive and feasible option when space and weight concerns govern design.
by Cory W. Lindh.
S.M.

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Verdirame, Justin Matthew 1978. "Design of multi-degree-of-freedom tuned-mass dampers using perturbation techniques". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89918.

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Liedes, T. (Toni). "Improving the performance of the semi-active tuned mass damper". Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514291258.

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Abstract The tuned mass damper (TMD) is a well-known and approved concept for resonance vibration control. However, as a fully passive device, the traditional TMD has a limited operating band and rather poor robustness against parameter variations. To overcome these weaknesses, a semi-active control can be applied to TMD. As a result, a more effective and flexible device can be attained. In theory, the application of the semi-active scheme is straightforward and the gain in performance is considerable. In practice, however, the non-idealities associated with actuators and control systems degrade the performance. In this thesis, the dynamic behaviour of a semi-active TMD with groundhook control was studied both numerically and experimentally. The semi-active scheme studied is based on groundhook control and a dry-friction damper is used as an actuator in rapid damping modulation. The performance of the semi-active TMD was evaluated in terms of two performance indices which are calculated from the normalised displacement response in the frequency domain. Also, parametric studies were conducted to find out how the different parameters influence the system performance. It is shown that the non-idealities in the semi-active damper have a significant influence on the performance of a groundhook controlled semi-active TMD. On the basis of simulations, a new parameterised semi-active control method was developed. The method is treated as a generalised groundhook control, and it involves a parameter through which the dynamic behaviour of a semi-active TMD can be affected both online and offline. The new method does not require an actuator model. The method developed opens the way for effective use of a non-ideal semi-active actuator, thus ensuring the good performance of the semi-active TMD. Also, the semi-active TMD’s sensitivity for certain parameter variation decreases considerably.

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Pallucco, Eleonora. "Controllo della risposta dinamica di un telaio mediante “Pendulum Tuned Mass Dampers - PTMD”". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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In questa tesi, inizialmente, sono stati affrontati questioni relative alla formulazione matematica dei pendoli: in particolar modo allo sviluppo dell’analisi matriciale che concerne i vari casi considerati sia in via teorica, che in quella pratica. Studiando i vari casi in via teorica, si è visto che l’applicazione del PTMD migliora notevolmente la risposta dei telai; mentre in via pratica, essendoci molte più incertezze ed irregolarità nei vari materiali e nei collegamenti tra di essi, in alcuni casi si riesce a vedere il miglioramento delle risposte solo attraverso gli andamenti degli accelerometri, e quindi solo attraverso PC; altri anche visivamente, come per il caso del telaio ad 1GdL alto 0,60 m.

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Książki na temat "Mass dampers"

Bekdaş, Gebrail, i Sinan Melih Nigdeli, red. Optimization of Tuned Mass Dampers. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7.

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Wielgos, Piotr. Ocena skuteczności działania wielokrotnych, strojonych tłumików masowych w konstrukcjach budowlanych. Lublin: Politechnika Lubelska, 2011.

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Gebrail Bekdaş i Sinan Melih Nigdeli. Optimization of Tuned Mass Dampers: Using Active and Passive Control. Springer International Publishing AG, 2022.

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Guo, Chuan, i Albert C. J. Luo. Nonlinear Vibration Reduction: An Electromagnetically Tuned Mass Damper System. Springer International Publishing AG, 2022.

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Damped Wave Transport and Relaxation. Elsevier Science, 2005.

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Sharma, Kal Renganathan. Damped Wave Transport and Relaxation. Elsevier Science & Technology Books, 2005.

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Boudreau, Joseph F., i Eric S. Swanson. Nonlinear dynamics and chaos. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198708636.003.0013.

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Simple maps and dynamical systems are used to explore chaos in nature. The discussion starts with a review of the properties of nonlinear ordinary differential equations, including the useful concepts of phase portraits, fixed points, and limit cycles. These notions are developed further in an examination of iterative maps that reveal chaotic behavior. Next, the damped driven oscillator is used to illustrate the Lyapunov exponent that can be used to quantify chaos. The famous KAM theorem on the conditions under which chaotic behavior occurs in physical systems is also presented. The principle is illustrated with the Hénon-Heiles model of a star in a galactic environment and billiard models that describe the motion of balls in closed two-dimensional regions.

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Geschichte der Reichspostdampfer: Verbindung zwischen den Kontinenten 1886–1914. Herford, Germany: Koehlers Verlagsgesellschaft, 1994.

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Części książek na temat "Mass dampers"

Cimellaro, Gian Paolo, i Sebastiano Marasco. "Tuned-Mass Dampers". W Introduction to Dynamics of Structures and Earthquake Engineering, 421–38. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72541-3_18.

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Altay, Okyay. "Tuned Mass Dampers". W Vibration Mitigation Systems in Structural Engineering, 119–42. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781315122243-7.

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Djerouni, Salah, Mahdi Abdeddaim, Said Elias, Dario De Domenico i Rajesh Rupakhety. "Optimal Seismic Response Control of Adjacent Buildings Coupled with a Double Mass Tuned Damper Inerter". W Optimization of Tuned Mass Dampers, 97–117. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_6.

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Kayabekir, Aylin Ece, Gebrail Bekdaş i Sinan Melih Nigdeli. "Optimum Tuning of Active Mass Dampers via Metaheuristics". W Optimization of Tuned Mass Dampers, 155–74. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_9.

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Yücel, Melda, Gebrail Bekdaş i Sinan Melih Nigdeli. "Metaheuristics-Based Optimization of TMD Parameters in Time History Domain". W Optimization of Tuned Mass Dampers, 55–66. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_4.

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Mehrkian, Behnam, i Okyay Altay. "Semi-active Tuned Liquid Column Dampers with Variable Natural Frequency". W Optimization of Tuned Mass Dampers, 131–53. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_8.

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Bekdaş, Gebrail, Sinan Melih Nigdeli i Aylin Ece Kayabekir. "Introduction and Overview: Structural Control and Tuned Mass Dampers". W Optimization of Tuned Mass Dampers, 1–13. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_1.

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Ulusoy, Serdar, Sinan Melih Nigdeli i Gebrail Bekdaş. "Introduction and Review on Active Structural Control". W Optimization of Tuned Mass Dampers, 41–54. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_3.

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Yücel, Melda, Sinan Melih Nigdeli i Gebrail Bekdaş. "Machine Learning-Based Model for Optimum Design of TMDs by Using Artificial Neural Networks". W Optimization of Tuned Mass Dampers, 175–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_10.

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Ocak, Ayla, Gebrail Bekdaş i Sinan Melih Nigdeli. "Optimization of Tuned Liquid Dampers for Structures with Metaheuristic Algorithms". W Optimization of Tuned Mass Dampers, 119–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98343-7_7.

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Streszczenia konferencji na temat "Mass dampers"

King, Melvin E., i Guido Sandri. "Dynamics of Distributed Impact Dampers". W ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-3922.

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Abstract In this work, the dynamics of spatially distributed impact dampers are investigated. Typical impact damper configurations consist of a single, rigid mass which moves freely within a cavity that is attached to a lightly damped structure. By tuning the damper’s mass and the cavity’s length (gap-size), the maximum displacement of the structure may be significantly reduced due to the resulting intermittent collisions. Several modifications to the classical impact damper design have been considered in the literature, including (i) multiple-unit dampers, and (ii) granular impact dampers. Both designs have been found to effectively attenuate resonant responses, while simultaneously reducing the severe impact loads, accelerations and noise levels associated with a single-unit damper. An extension of the multiple-unit damper configuration is considered in the present work. The configuration under consideration (referred to as a distributed impact damper) incorporates a number of non-identical single-unit dampers. Whereas multiple-unit dampers composed of identical elements may be tuned to a specified resonant frequency, the proposed distributed impact damper is expected to provide significant attenuation over broad frequency bands. The present work focuses on developing analytical tools with which to study the dynamics of distributed impact dampers. In this regard, methods from non-equilibrium statistical mechanics, including correlation hierarchy, will be used to develop statistical models of the distributed impact damper. Successful completion of this work is expected to provide significant insight into the dynamics of distributed impact dampers, leading to the future development of novel broad-band damping and shock isolation designs.

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Masaki, Nobuo, i Hisashi Hirata. "Vibration Control Performance of Damping Coupled Tuned Mass Dampers". W ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2940.

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Recently tuned mass dampers have been installed on three-story prefabricated houses for reducing of traffic-induced vibration and improving living comfort. This tuned mass damper consists of a mass unit, spring units and laminated rubber bearings. The mass is supported by four laminated rubber bearings, and spring units are used for adjusting the natural frequency of the tuned mass damper to the optimal value. Vibration control performance of this type of tuned mass dampers is deteriorated when the natural frequency of the house is changed. To solve this problem, the authors have developed a damping coupled tuned mass damper. In this type of tuned mass damper, two mass units having slightly different natural frequencies are coupled by using a damping unit. In this paper, mechanism and vibration control performance of the damping coupled tuned mass damper are described.

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Winkler, Karl. "Guidelines for Optimizing Vibration Mass Dampers". W SAE International Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1988. http://dx.doi.org/10.4271/880076.

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Hillberger, Thomas, Thomas Furtmüller, Philipp Dietsch i Roland Maderebner. "ACTIVE MASS DAMPERS FOR TIMBER FLOORS". W World Conference on Timber Engineering 2023 (WCTE2023). As, Norway: World Conference on Timber Engineering (WCTE 2023), 2023. http://dx.doi.org/10.52202/069179-0251.

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Chandrasekaran, Srinivasan, Deepak Kumar i Ranjani Ramanathan. "Response Control of TLP Using Tuned Mass Dampers". W ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23597.

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Offshore tension leg platform (TLP) is a compliant type offshore structure where the tendons are deployed under initial pretension to counteract the excessive buoyancy. TLPs show large amplitude response under environmental loads due to their compliancy, which poses threat under extreme loads. Use of passive dampers like Tuned Mass Damper (TMD) is common to control such large amplitude motion, however their deployment in offshore structures is relatively new. Response control of a scaled model of TLP is attempted using tuned mass damper of pendulum type under regular waves. Based on the experimental studies carried out, it is seen that there is a significant reduction in the surge response under the folded pendulum type damper. Results also show that there is a reduction in the heave response due to the control envisaged in the surge motion. The discussed method of response control is one of the effective methods of retrofitting offshore platforms whose operability at rough sea states is a serious concern.

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Gharib, Mohamed, i Mansour Karkoub. "A Comparative Study of Mass Based Vibration Dampers". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70873.

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Undesired vibrations in structures, buildings, and machines lead to reduction in the life of the system and greatly affects the safety of the occupying or operating personnel. In addition, economic and time losses could result from needed repairs or reconstruction. Many control techniques, active and passive, have been devised over the years to reduce/eliminate the vibrations in the aforementioned systems. Passive vibration control techniques are favorable over the active ones due to their simplicity, ease of implementation, cost, and power consumption. In dynamic structures, such as large buildings, passive control techniques are favored over their active counterparts. The most common types of passive control devices are tuned mass and impact dampers. The advocates of each of these devices boasts advantages of the others; however, there have been no systematic studies to compare and quantify the effectiveness of each of these types of devices as well as their suitability for specific applications. In this paper, a comparative study between the tuned mass dampers and impact dampers is conducted. A one-story structure is used to show the effectiveness of each of these devices in absorbing the vibrations of the structure. The coupled systems are modeled and simulated under free vibrations. The time responses are acquired using the same geometric parameters, excitation, and initial conditions. The comparisons are based on the settling time and amplitude decay rates of the primary system using each damper type. The numerical results show that both dampers can produce similar dampening effects if the parameters are optimized; however, correlating the dampers parameters is a challenging problem in the field of vibration and control.

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Pei, Yalu, i Lei Zuo. "Multi-Resonant Electromagnetic Shunt Dampers for Vibration Suppression". W ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67559.

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This paper proposed multi-resonant electromagnetic (EM) shunt dampers and investigated the optimal designs and performances of shunt circuits for a single DOF primary system. The circuits are arranged in parallel or series based on the analogy of multiple tuned mass dampers (TMDs). The objective is to minimize the root-mean-square (RMS) vibration of the primary system subjected to random base excitations. For single resonant EM shunt damper, closed-form solutions of optimal system parameters are obtained. For multi-resonant EM shunt dampers, the system parameters are numerically optimized. The vibration suppression performance of multi-resonant EM shunt dampers are compared with double-mass TMDs under the same 5% total stiffness ratio. It shows that the parallel shunt damper can achieve slightly better performance than parallel TMDs while the series shunt damper behaves differently from series TMDs. The optimal result of the series shunt damper will be the same as the single resonant shunt damper. It is also found that the multi-resonant EM shunt damper is much more sensitive to the capacitance than the resistance in the shunt circuits.

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Aubert, Allan C., Edward R. Green i Gregory Z. Chen. "A Comparison of the Effectiveness of Elastomeric Tuned Mass Dampers and Particle Dampers". W SAE 2003 Noise & Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-1419.

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Yang, Fan, Ramin Sedaghati i Ebrahim Esmailzadeh. "Seismic Response Controlled Structure With Semi-Active Mass-Damper". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69001.

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The structural vibration suppression using active and semi-active mass damper is investigated. The controller for full-active controlled mass dampers is designed using the H2/LQG method. Magneto-Rheological (MR) damper is used to design the semi-active controlled mass damper. The inverse MR-damper model is developed on the base of an improved LuGre friction model. It combined with the proposed H2/LQG controller to control the input current of the MR-damper to suppress the structural vibration efficiently. The illustrated examples are presented to compare the vibration suppression effectiveness of semi-active mass damper with MR-damper using the proposed controller with those reported in literatures in order to illustrate the validity of the proposed methodology.

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Al-Rumaih, Wail S., i Ahmad R. Kashani. "A Viscoelastic Tuned Mass Damper for Vibration Treatment of Large Structures". W ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69485.

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Abstract Viscoelastic (VE) tuned mass dampers (TMDs) using commercially available, small thickness, VE material have been used extensively in adding targeted damping to light structures. The most common approach for realizing stiffness and damping in these tuned devices has been applying VE material to strips of elastic material (mainly metal, e.g. steel) in an unconstrained or constrained layer fashion and using such assemblies, which can be viewed as a damped leaf-springs, for the suspension element of the tuned mass damper. In this work, the suitability of tuned mass dampers with visco-elastically damped leaf-spring suspension for treating large, massive civil engineering structures, more specifically floor systems, was studied numerically and experimentally. The effectiveness of this tuned mass damper configuration turned out to be disappointing. In parallel to the above-mentioned study, an alternative VE suspension was devised by stacking a number of 25 mm (1 inch) thick VE rings interlaced with the same number of metal constraining ring layers. By changing the number of these rings, different stiffness’s are realized and thus different tuning frequencies are achieved. The material properties of the VE polymer used in both studies are defined in terms of Prony series parameters. Viewing the Prony series parameters as optimization variables, they are recovered by minimizing the mean squared error between the dynamic material properties predicted by the Prony series parameters and the frequency-dependent dynamic material properties provided by the manufacturer. Using the material properties of the VE material, the dynamic finite element model of a 100 lb TMD was constructed and its tuned damping effectiveness demonstrated, numerically. The 100 lb TMD was also built and used to a) verify the numerical model and b) experimentally demonstrate the performance of the TMD.

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Raporty organizacyjne na temat "Mass dampers"

Sadek, Fahim, Bijan Mohraz, Andrew W. Taylor i Riley M. Chung. A method of estimating the parameters of tuned mass dampers for seismic application. Gaithersburg, MD: National Institute of Standards and Technology, 1996. http://dx.doi.org/10.6028/nist.ir.5806.

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Teitsma i Shuttleworth. PR-004-03127-R01 Gas Coupled Ultrasonic Pipeline Inspection. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), styczeń 2008. http://dx.doi.org/10.55274/r0010897.

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The gas coupled ultrasonics (GCUS) project aims to develop a method for inspecting gas pipelines using a modification of the standard ultrasonic method that does not require a liquid couplant. Ultrasonic inspection is the highest accuracy inspection method readily available for measuring remaining wall thickness and measures it directly rather than inferring it from measurements of metal loss as occurs with other methods, for example MFL. Traditional ultrasonic methods require a liquid couplant between the transducer and the wall that, although it has been done, requires the unwanted introduction of a liquid in a gas pipeline for gas pipeline inspection. The problem with using gas as a couplant is that, even at high pressure, very little ultrasonic energy is transmitted into the pipe wall, most of it being reflected back to the transducer. The result is a huge signal from the front wall that masks the tiny signals from the back wall unless the transducer is highly damped, causing rapid ring down. Early requirements for a successful transducer were 80 dB ring down in 2 microseconds and electronics that could handle a dynamic range of 120 dB.

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