Relevant bibliographies by topics / Passive damper

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  2. Dissertations / Theses
  3. Books
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Academic literature on the topic 'Passive damper'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 June 2024

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Journal articles on the topic "Passive damper"

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Jacob, Kiran, Aditya Suryadi Tan, Thomas Sattel, and Manfred Kohl. "Enhancement of Shock Absorption Using Hybrid SMA-MRF Damper by Complementary Operation." Actuators 11, no. 10 (September 30, 2022): 280. http://dx.doi.org/10.3390/act11100280.

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A hybrid damper concept is presented here using a combination of a Magnetorheological (MR) Fluid (MRF) and Shape Memory Alloy (SMA)-based energy dissipation. A demonstration is performed utilizing the shear operating mode of the MRF and the one-way effect of the SMA. The damping performance of different MRF–SMA configurations is investigated and the corresponding energy consumption is evaluated. We demonstrate that the operation of MRF and SMA dampers complement each other, compensating for each other’s weaknesses. In particular, the slow response from the MR damper is compensated by passive SMA damping using the pseudoplastic effect of martensite reorientation, which can dissipate a significant amount of shock energy at the beginning of the shock occurrence. The MR damper compensates for the incapability of the SMA to dampen subsequent vibrations as long as the magnetic field is applied. The presented hybrid SMA–MR damper demonstrates superior performance compared to individual dampers, allowing for up to five-fold reduction in energy consumption of the MR damper alone and thereby opening up the possibility of reducing the construction volume of the MR damper.
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Wang, Zhi Hao. "Experimental Study on Multi-Mode Vibration Control of a Stay Cable with a Passive Magnetorheological Damper." Applied Mechanics and Materials 361-363 (August 2013): 1402–5. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1402.

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Effective vibration control technology for stay cables is extremely critical to safe operations of cable-stayed bridges. For super-long cables, passive linear damper cannot provide sufficient damping since it can be only optimum for a given mode of cable, while a long cable may vibrate with several modes. This paper focuses on multi-mode vibration control of stay cables with passive magnetorheological (MR) dampers. Firstly, a 21.6m-long model cable was designed and established in the laboratory.Then, control performance of the cable with a passive MR damper was tested. The test results show that modal damping ratios of the cable in the first four modes can be improved significantly with the MR damper. It is further demonstrated that optimal tuned passively operated MR damper can outperform the passive viscous damper.
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Qian, Hui, Hongnan Li, Gangbing Song, and Wei Guo. "Recentering Shape Memory Alloy Passive Damper for Structural Vibration Control." Mathematical Problems in Engineering 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/963530.

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This paper presents a preliminary study on the evaluation of an innovative energy dissipation system with shape memory alloys (SMAs) for structural seismic protection. A recentering shape memory alloy damper (RSMAD), in which superelastic nitinol wires are utilized as energy dissipation components, is proposed. Improved constitutive equations based on Graesser and Cozzarelli model are proposed for superelastic nitinol wires used in the damper. Cyclic tensile-compressive tests on the damper with various prestrain under different loading frequencies and displacement amplitudes were conducted. The results show that the hysteretic behaviors of the damper can be modified to best fit the needs for passive structural control applications by adjusting the pretension of the nitinol wires, and the damper performance is not sensitive to frequencies greater than 0.5 Hz. To assess the effectiveness of the dampers for structural seismic protection, nonlinear time history analysis on a ten-story steel frame with and without the dampers subjected to representative earthquake ground motions was performed. The simulation results indicate that superelastic SMA dampers are effective in mitigating the structural response of building structures subjected to strong earthquakes.
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Yang, Yi Qing, and Wei Dai. "Optimization of the Two-DOF Passive Damper for the Machining Vibration Control Based on the SDM." Materials Science Forum 770 (October 2013): 253–56. http://dx.doi.org/10.4028/www.scientific.net/msf.770.253.

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Two-DOF (Degree-of-Freedom) passive damper is found to be able to attain better performance than the Single-DOF damper in the machining vibration control. However, the optimization is much more complicated as there are more design variables. A new approach of optimizing the Two-DOF passive damper is proposed based on the Structural Dynamical Modification (SDM) method. The physical model of Two-DOF damper damping single mode is presented, and the Frequency Response Function (FRF) of the primary structure are formulated. Numerical simulation is carried out and the optimal geometrical parameters are obtained with an objective ofHnorm. It is found that the Two-DOF passive damper can achieve the best vibration suppression effect than the SDOF damper, two separate SDOF dampers and uniform-density bar while the mass ratio is the same.
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Baheti, Akshay Satishkumar, and Vasant Annasaheb Matsagar. "Wind and Seismic Response Control of Dynamically Similar Adjacent Buildings Connected Using Magneto-Rheological Dampers." Infrastructures 7, no. 12 (December 7, 2022): 167. http://dx.doi.org/10.3390/infrastructures7120167.

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Wind and/or earthquake-imposed loadings on two dynamically similar adjacent buildings cause vigorous shaking that can be mitigated using energy dissipating devices. Here, the vibration response control in such adjacent structures interconnected with semi-active magneto-rheological (MR) dampers is studied, which could also be used as a retrofitting measure in existing structures apart from employing them in new constructions. The semi-active nature of the MR damper is modeled using the popular Lyapunov control algorithm owing to its least computational efforts among the other considered control algorithms. The semi-active performance of the MR damper is compared with its two passive states, e.g., passive-off and passive-on, in which voltage applied to the damper is kept constant throughout the occurrence of a hazard, to establish its effectiveness even during the probable electric power failure during the wind or seismic hazards. The performance of the MR damper, in terms of structural response reduction, is compared with other popular energy dissipating devices, such as viscous and friction dampers. Four damper arrangements have been considered to arrive at the most effective configuration for interconnecting the two adjoining structures. Structural responses are recorded in terms of storey displacement, storey acceleration, and storey shear forces. Coupling the two adjacent dynamically similar buildings results in over a 50% reduction in the structural vibration against both wind and earthquake hazards, and this is achieved by not necessarily connecting all the floors of the structures with dampers. The comparative analysis indicates that the semi-active MR damper is more effective for response control than the other passive dampers.
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Zhang, Peng, Dabin Zhu, Huli Dong, Zeng Wang, Jiaao Wang, and Xiying Chen. "Considering lateral bending and torsion coupling in shimmy analysis of the nose landing gear." Journal of Physics: Conference Series 2658, no. 1 (December 1, 2023): 012053. http://dx.doi.org/10.1088/1742-6596/2658/1/012053.

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Abstract This paper focuses on the shimmy damper performance of nose landing gear and aims to establish and amend a five-dimensional dynamic model of nose landing gear. The study compares the shimmy damper performance of nose landing gear whether considering lateral bending and torsional vibrations coupling and concludes that the amended model provides greater accuracy. In addition, the research compares the shimmy performance of passive and active shimmy dampers, finding that the active shimmy damper significantly outperforms the passive one in terms of efficiency. The amended model is also shown to improve the shimmy damper performance of active shimmy damper.
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Ahmad, Aabas. "Analysis of Load Reduction of Floating Wind Turbines Using Passive Tuned Mass Dampers." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (September 30, 2021): 1340–45. http://dx.doi.org/10.22214/ijraset.2021.38179.

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Abstract: An efficient method for restraining the large vibration displacements and loads of offshore floating wind turbines under harsh marine environment is proposed by putting tuned mass dampers in the cabin. A dynamics model for a barge-type offshore floating wind turbine with a fore–aft tuned mass damper is established based on Lagrange’s equations; the nonlinear least squares Leven berg–Marquardt algorithm is employed to identify the parameters of the wind turbine; different parameter optimization methods are adopted to optimize tuned mass damper parameters by considering the standard deviation of the tower top longitudinal displacement as the objective function. Aiming at five typical combined wind and wave load cases under normal running state of the wind turbine, the dynamic responses of the wind turbine with/without tuned mass damper are simulated and the suppression effect of the tuned mass damper is investigated over the wide range of load cases. The results show that when the wind turbine vibrates in the state of damped free vibration, the standard deviation of the tower top longitudinal displacement is decreased approximately 60% in 100 s by the optimized tuned mass damper with the optimum tuned mass damper mass ratio 1.8%. The standard deviation suppression rates of the longitudinal displacements and loads in the tower and blades increase with the tuned mass damper mass ratio when the wind turbine vibrates under the combined wind and wave load cases. When the mass ratio changes from 0.5% to 2%, the maximum suppression rates vary from 20% to 50% correspondingly, which effectively reduce vibration responses of the offshore floating wind turbine. The results of this article preliminarily verify the feasibilities of using a tuned mass damper for restraining vibration of the barge-type offshore floating wind turbine
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Luong, Quoc Viet, Dae-Sung Jang, and Jai-Hyuk Hwang. "Intelligent Control Based on a Neural Network for Aircraft Landing Gear with a Magnetorheological Damper in Different Landing Scenarios." Applied Sciences 10, no. 17 (August 28, 2020): 5962. http://dx.doi.org/10.3390/app10175962.

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A typical oleo-pneumatic shock-absorbing strut (classic traditional passive damper) in aircraft landing gear has a metering pin extending through the orifice, which can vary the orifice area with the compression and extension of the damper strut. Because the metering pin is designed in a single landing condition, the traditional passive damper cannot adjust its damping force in multiple landing conditions. Magnetorheological (MR) dampers have been receiving significant attention as an alternative to traditional passive dampers. An MR damper, which is a typical semi-active suspension system, can control the damping force created by MR fluid under the magnetic field. Thus, it can be controlled by electric current. This paper adopts a neural network controller trained by two different methods, which are genetic algorithm and policy gradient estimation, for aircraft landing gear with an MR damper that considers different landing scenarios. The controller learns from a large number of trials, and accordingly, the main advantage is that it runs autonomously without requiring system knowledge. Moreover, comparative numerical simulations are executed with a passive damper and adaptive hybrid controller under various aircraft masses and sink speeds for verifying the effectiveness of the proposed controller. The main simulation results show that the proposed controller exhibits comparable performance to the adaptive hybrid controller without any needs for the online estimation of landing conditions.
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Ferreyra, María Victoria, Julián M. Gómez-Paccapelo, Ramiro Suarez, and 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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Tan, Aditya Suryadi, Thomas Sattel, and Richard Subianto. "A Novel Design Concept of a Magnetorheological Fluid-Based Damper Utilizing the Porous Medium for Implementation in Small-Scale Applications." Fluids 8, no. 7 (July 7, 2023): 203. http://dx.doi.org/10.3390/fluids8070203.

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Magnetorheological (MR) dampers have a virtue over conventional dampers, where their damping properties can be adjusted using a magnetic field. However, MR dampers have been barely implemented in small vibratory systems, in which the modal mass and stiffness are relatively small. This is due to two major reasons, namely its high parasitic damping force and big moving mass. When such an MR damper is installed in a small vibratory system, the system‘s default damping ratio is increased and therefore its dynamic is reduced. Here, a new concept of an MR damper utilizing the porous medium and shear operating mode together with an external non-moving electromagnet is proposed. This combination results in an MR damper with a low parasitic damping force and a small moving mass. For comparison purposes, a benchmark MR damper with comparable geometry is constructed. The proposed MR damper possesses a passive friction force that is 8× smaller and OFF-state passive viscous damping that is 10–20× smaller than the benchmark MR damper. An investigation of the proposed MR damper performance in a test vibratory system shows almost no reduction of the system dynamic. Therefore, this proposed MR damper configuration can be suitable for applications in small vibratory systems.
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Dissertations / Theses on the topic "Passive damper"

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Chey, Min Ho. "Passive and Semi-Active Tuned Mass Damper Building Systems." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2007. http://hdl.handle.net/10092/3431.

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This thesis explores next generation passive and semi-active tuned mass damper (PTMD and SATMD) building systems for reducing the seismic response of tall structures and mitigating damage. The proposed structural configuration separates the upper storey(s) of a structure to act as the 'tuned' mass, either passively or semi-actively. In the view point of traditional TMD system theory, this alternative approach avoids adding excessive redundant mass that is rarely used. In particular, it is proposed to replace the passive spring damper system with a semi-active resetable device based system (SATMD). This semi-active approach uses feedback control to alter or manipulate the reaction forces, effectively re-tuning the system depending on the structural response. In this trade-off parametric study, the efficacy of spreading stiffness between resetable devices and rubber bearings is illustrated. Spectral analysis of simplified 2-DOF model explores the efficacy of these modified structural control systems and the general validity of the optimal derived parameters is demonstrated. The end result of the spectral analysis is an optimally-based initial design approach that fits into accepted design methods. Realistic suites of earthquake ground motion records, representing seismic excitations of specific return period probability, are utilised, with lognormal statistical analysis used to represent the response distribution. This probabilistic approach avoids bias toward any particular type of ground motion or frequency content. Statistical analysis of the performance over these suites thus better indicates the true overall efficacy of the PTMD and SATMD building systems considered. Several cases of the segregated multi-storey TMD building structures utilising passive devices (PTMD) and semi-active resetable devices (SATMD) are described and analysed. The SATMD building systems show significant promise for applications of structural control, particularly for cases where extra storeys might be added during retrofit, redevelopment or upgrade. The SATMD approach offers advantages over PTMD building systems in the consistent response reductions seen over a broad range of structural natural frequencies. Using an array of performance metrics the overall structural performance is examined without the typically narrow focus found in other studies. Performance comparisons are based on statistically calculated storey/structural hysteretic energy and storey/structural damage demands, as well as conventional structural response performance indices. Overall, this research presents a methodology for designing SATMD building systems, highlighting the adaptable structural configuration and the performance obtained. Thus, there is good potential for SATMD building systems, especially in retrofit where lack of space constrains some future urban development to expand upward. Finally, the approach presented offers an insight into how rethinking typical solutions with new technology can offer dramatic improvements that might not otherwise be expected or obtainable.
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Sallar, Grace A. "Modeling and Validation of the Resettable Semi-Passive Stiffness Damper." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417079222.

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Bigdeli, Kasra. "Optimal placement and design of passive damper connectors for adjacent structures." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43015.

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Passive coupling of adjacent structures is known to be an effective method to reduce undesirable vibrations and structural pounding effects. Past results have shown that reducing the number of dampers can considerably decrease implementation costs and does not significantly decrease the efficiency of the system. The main objective of this thesis is the optimal design of a limited number of dampers to minimize the inter-story drift. In this thesis, we present a bi-level optimization algorithm to find the optimal arrangement and mechanical properties of dampers placed between two adjacent buildings to minimize the maximum inter-story drift during (simulated) earthquake conditions. Under the assumption of equal damping coefficients for all dampers, the optimal damping configuration is found via five different approaches: exhaustive search, inserting dampers, inserting floors, locations of maximum relative velocity, and a genetic algorithm. Through several numerical tests, efficiency and robustness of each optimization method is examined. It is shown that the inserting damper method is the most efficient and reliable method, particularly for tall structures. It is also found that, assuming equal damping coefficients for all dampers, increasing the number of dampers can exacerbate the dynamic response of the system. Finding an efficient method to optimize dampers’ locations, we focus on the optimization of the damping coefficients. Letting the dampers have varying damping coefficients, the optimization problem of damping coefficients is an n-dimensional optimization problem, whose objective function is provided via a simulation. Therefore, we use non-gradient based techniques for the inner-loop of the algorithm. We compare three different methods: a genetic algorithm (GA), a mesh adaptive direct search (MADS) algorithm, and the robust approximate gradient sampling (RAGS) algorithm. RAGS is a derivative free optimization (DFO) method that exploits the structure of the finite minimax problem. Using these techniques, we show that there exists a threshold on the number of dampers inserted with respect to the efficiency of the retrofitting system. Furthermore, we show that using a structured internal subroutine (such as RAGS) for the inner-loop of the bi-level problem greatly increases the efficiency of the retrofitting system.
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Gutierrez, Soto Mariantonieta. "INVESTIGATION OF PASSIVE CONTROL OF IRREGULAR BUILDING STRUCTURES USING BIDIRECTIONAL TUNED MASS DAMPER." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354596462.

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Kim, Hyeong Gook. "New passive damper systems for vibration control of residential houses and building structures." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/161001.

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Chen, Chen. "Simulation, design and experimental validation of a passive magnetic damper for ultra-fast actuators." Thesis, KTH, Elektroteknisk teori och konstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153639.

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A contact system driven by a high energetic Thomson actuator requires to be decelerated from full speed down to zero. The forces originated from the interaction between a stationary copper tube and a moving array of magnets combined with plastic or ferromagnetic material are used to generate eddy-current damping. Five different configurations of small but strong (N52) neodymium magnets and spacers were benchmarked for simple free-fall damping. A comparison between experimental results and simulations (using COMSOL) has shown that the most effective damping is reached by two consecutive permanent magnets with opposite magnetization directions ,separated by low-carbon content steel concentrators(SN - Fe concentrator- NS). The proposed damper design is the result of the balance between various parameters such as magnet orientation topology in the array, spacer material and its dimensions, copper tube thickness and the air gap between copper tube and array. Furthermore, the design was scaled up and an actuator-drive system was added to perform more realistic tests, which demonstrated the damping effectiveness on a fast moving armature actuated by a Thomson coil energized by a capacitor bank. All models in the simulation predicted the damping effect in advance. Investigations were conducted with two cases: (1) A solid copper rod was supposed to pass through the magnet array; (2) A plastic shaft was applied to support the magnet array. Finally a damping prototype with a plastic shaft was built for completing damping tests. The results of these tests validated the numerical model with a high degree of accuracy.
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Marian, Laurentiu. "The tuned mass damper inerter for passive vibration control and energy harvesting in dynamically excited structural systems." Thesis, City University London, 2016. http://openaccess.city.ac.uk/14884/.

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A novel passive vibration control configuration, namely the Tuned-Mass-Damper-Inerter (TMDI) is proposed in this work. The TMDI combines the “inerter”, a mechanical two-terminal flywheel device developing resisting forces proportional to the relative acceleration of its terminals, with the well-known and widely used in various passive vibration control applications Tuned-Mass-damper (TMD). Introduced as a generalization of the TMD, the TMDI takes advantage of the “mass amplification effect” of the inerter to achieve enhanced performance compared to the classical TMD. For linear harmonically excited primary systems, analytical closed-form expressions are derived for optimal TMDI design/tuning parameters using the well-established and widely applied for the case of the classical TMD semi-empirical fixed-point theory. It is shown that for the same attached mass the TMDI system is more effective than the classical TMD to suppress vibrations close to the natural frequency of the uncontrolled primary system, while it is more robust to de-tuning effects. Moreover, it is analytically shown that optimally designed TMDI outperforms the classical TMD in minimizing the displacement variance of undamped linear single-degree-of-freedom (SDOF) white-noise excited primary systems. For this particular case, optimal TMDI parameters are derived in closed-form as functions of the additional oscillating mass and the inerter constant. Furthermore, pertinent numerical data are furnished, derived by means of a numerical optimization procedure, for classically damped mechanical cascaded chain-like primary systems base excited by stationary colored noise. This exemplifies the effectiveness of the TMDI over the classical TMD to suppress the fundamental mode of vibration for linear MDOF structures. It is concluded that the incorporation of the inerter in the proposed TMDI configuration can either replace part of the TMD vibrating mass to achieve lightweight passive vibration control solutions, or improve the performance of the classical TMD for a given TMD mass. The TMDI is further applied for passive vibration control of seismically excited building structures. An input non-stationary stochastic process compatible with the elastic design spectrum of the European aseismic code provisions (EC8) is assumed. The effectiveness of the proposed TMDI configuration over the classical TMD is assessed by performing response history analyses for an ensemble of EC8 spectrum compatible field recorded strong ground motions. The optimally tuned TMDI solution achieves considerable reduction of the peak average top floor displacement and peak average top floor accelerations of the considered primary structures compared to the one achieved by the optimally designed classical TMD, assuming the same additional mass in both cases. Furthermore, the TMDI configuration achieves significant reduction in the maximum displacement of the additional oscillating mass. In this study, the primary structures are assumed to behave linearly in alignment with current trends in performance based requirements for minimally damaged structures protected by passive control devices. Furthermore, optimally designed TMDI is applied for vibration suppression and energy harvesting via an electromagnetic device which transforms the mechanical kinetic energy into electrical energy. Unlike the case of traditional energy harvesting enabled TMD systems, the amount of available energy to be harvested by the herein proposed TMDI-based harvester is leveraged by changing the intensity of the mass amplification effect of the inerter, through mechanical gearing, without changing the weight of the TMDI system. Therefore, the inclusion of the inerter adds a “degree of freedom” or a design parameter to the classical TMD-based harvesters allowing to control the trade-off between vibration suppression and energy harvesting in a more flexible manner. Overall, the herein reported numerical data and analytical work provide evidence that the TMDI offers a novel promising solution for passive vibration control and energy harvesting. Most importantly, it opens several new research paths involving numerical/parametric work, as well as, prototyping, experimental testing and field deployment.
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Kline, Eric S. "Replacement of an active metatarsophalangeal joint with a passive spring-damper system for implementation in an ankle prosthesis." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105695.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 22).
Analytical modeling was used to determine the optimal configuration of a replacement metatarsophalangeal (MTP) joint to be used in a prosthetic ankle. A spring was added to the joint to store energy and release it during the part of the gait cycle where the highest torque is required, reducing the torque the motor must exert. A linear spring-damper system adapted for use on a rotational joint was found to exhibit similar behavior to the biological joint for the range of motion required. The optimal gear ratio for the ankle motor, spring constant, and damping constant for the MTP joint were found using a MATLAB program written for this purpose. A physical prototype was fabricated, and testing was performed on an Instron machine to validate the results.
by Eric S. Kline.
S.B.
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Malher, Arnaud. "Amortisseurs passifs non linéaires pour le contrôle de l’instabilité de flottement." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY010/document.

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Cette thèse est consacrée à l'étude d'amortisseurs passifs non linéaires innovants pour le contrôle de l'instabilité de flottement sur un profil d'aile à deux degrés de libertés. Lorsqu'un profil d'aile entre en flottement, il oscille de façon croissante jusqu'à se stabiliser sur un cycle limite dont l'amplitude peut être significative et détériorer sa structure. Le contrôle a ainsi deux objectifs principaux : retarder l'apparition de l'instabilité et réduire l'amplitude des cycles limites. Avant d'étudier l'influence des amortisseurs passifs, l'instabilité de flottement, et notamment le régime post-flottement, a été étudié. Une expérience de flottement sur une plaque plane a été menée et sa modélisation, prenant en compte le phénomène de décrochage dynamique, a été réalisée. Concernant le contrôle passif, le premier type d'amortisseur étudié est un amortisseur hystérétique réalisé à l'aide de ressorts en alliage à mémoire de forme. La caractéristique principale de tels amortisseurs est que leur force de rappel étant hystérétique, elle permet de dissiper une grande quantité d'énergie. L'objectif principal est ainsi de réduire l'amplitude des cycles limites provoqués par l'instabilité de flottement. Cet effet escompté a été observé et quantifié expérimentalement et numériquement à l'aide de modèles semi-empiriques. Le second type d'amortisseur utilisé est un amortisseur non linéaire de vibration accordé. Il est composé d'une petite masse connectée au profil d'aile à l'aide d'un ressort possédant une raideur linéaire et une raideur cubique. La partie linéaire de ce type d'amortisseur permet de retarder l'apparition de l'instabilité tandis que la partie non linéaire permet de réduire l'amplitude des cycles limites. L'influence de l'amortisseur non linéaire de vibration accordé a été étudiée analytiquement et numériquement. Il a été trouvé que l'apparition de l'instabilité est significativement retardée à l'aide de cet amortisseur, l'effet sur l'amplitude des cycles limites étant plus modeste
The aim of this thesis is to study the effect of passive nonlinear absorbers on the two degrees of freedom airfoil flutter. When an airfoil is subject to flutter instability, it oscillates increasingly until stabilizing on a limit cycle, the amplitude of which can be possibly substantial and thus damage the airfoil structure. The control has two main objectives : delay the instability and decrease the limit cycle amplitude. The flutter instability, and the post-flutter regime in particular, were studied first. A flutter experiment on a flat plate airfoil was conducted and the airfoil behavior was modeled, taking into account dynamic stall. Regarding the passive control, the first absorber studied was a hysteretic damper, realized using shape memory alloys springs. The characteristic of such dampers is their hysteretic restoring force, allowing them to dissipate a large amount of energy. Their main goal was thus to decrease the limit cycle amplitude caused by the flutter instability. This expected effect was observed and quantified both experimentally and numerically, using heuristic model. The second absorber studied was a nonlinear tuned vibration absorber. This absorber consists of a light mass attached to the airfoil through a spring having both a linear and a cubic stiffness. The role of the linear part of such absorber was to repel the instability threshold, while the aim of the nonlinear part was to decrease the limit cycle amplitude. It was found, analytically and numerically, that the instability threshold is substantially shifted by this absorber, whereas the limit cycle amplitude decrease is relatively modest
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Rai, Tannaw. "Parametric study of offshore structures with magneto-rheological tuned liquid column damper." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The master thesis work involved the implementation of Magneto-rheological tuned liquid damper for the mitigation of undesired vibration caused in offshore structures. The research begins with the study of passive tuned liquid column damper with uniform and non-uniform cross-section, coupled with an offshore structure under random wave force. The results show that increasing the density of the liquid used in the TLCD system gives better results, which provides an opportunity to use fluids with varying density and possibility to modify the conventional passive system into a semi-active damping system. Therefore, the normal fluid is switched with a magnetic fluid which has the ability to change its yield strength under an applied magnetic field. There are two different approaches used in the study to formulate the mathematical model of the semi-active MR-TLCD. The first approach is based on using the magnetic force as an additional stiffness while the second approach is based on using the yield strength of the liquid as an additional damping force in the system. As a result, the efficiency of the semi-active MR-TLCD system was found to be better than the conventional passive TLCD system.
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Books on the topic "Passive damper"

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M, Paulekar Y., and Bhabha Atomic Research Centre, eds. Elasto-plastic damper for passive control of seismic response of piping systems. Mumbai: Bhabha Atomic Research Centre, 2003.

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Takewaki, Izuru. Building control with passive dampers. Singapore: J. Wiley & Sons (Asia), 2010.

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Takewaki, Izuru. Building control with passive dampers. Singapore: J. Wiley & Sons (Asia), 2010.

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Takewaki, Izuru. Building control with passive dampers: Optimal performance-based design for earthquakes. Singapore: J. Wiley & Sons (Asia), 2009.

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The passage of the damned: What happened to the men and women of the Lady Shore mutiny. North Melbourne, Vic: Australian Scholarly Publishing Pty Ltd, 2019.

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1450-1500, Canavesio Giovanni fl, ed. Painter and priest: Giovanni Canavesio's visual rhetoric and the Passion cycle at La Brigue. Notre Dame, IN: University of Notre Dame Press, 2005.

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

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Takewaki, Izuru. Building Control with Passive Dampers: Optimal Performance-Based Design for Earthquakes. Wiley & Sons, Incorporated, John, 2011.

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Takewaki, Izuru. Building Control with Passive Dampers: Optimal Performance-Based Design for Earthquakes. Wiley & Sons, Limited, John, 2010.

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Takewaki, Izuru. Building Control with Passive Dampers: Optimal Performance-Based Design for Earthquakes. Wiley & Sons, Incorporated, John, 2011.

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Book chapters on the topic "Passive damper"

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Preumont, André, David Alaluf, and Renaud Bastaits. "Hybrid Mass Damper: A Tutorial Example." In Active and Passive Vibration Control of Structures, 179–211. Vienna: Springer Vienna, 2014. http://dx.doi.org/10.1007/978-3-7091-1821-4_3.

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Kavyashree, Shantharama Patil, and Vidya S. Rao. "Seismic Vibration Mitigation of Damped Outrigger Structure Using a Passive Damper." In Lecture Notes in Mechanical Engineering, 537–45. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6738-1_44.

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Miah, Mohammad Shamim, and Werner Lienhart. "Performance Comparison of Different Vibration Control Strategies." In Lecture Notes in Civil Engineering, 126–34. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57800-7_11.

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AbstractStructural engineers are always struggling with the unpredictable complexities of the extreme vibration due to natural or human induced loads. It is not possible to eliminate the vibration from structures entirely what so ever. Therefore, in order to keep the structures safe and healthy, the vibration needs to be mitigated and that can be done by adopting passive, active or semi-active type control systems. Those aforementioned technologies come with a price, hence, it is not so straightforward to decide which technology should be adopted. The passive vibration systems (e.g. tuned mass damper, base-isolator) can be found both in many old and new structures due to their feasibility and simplicity. On the other hand, many modern structures are adopting active and semi-active control systems (e.g. dampers) as an alternative to achieve better control on structure. Both the active and semi-active control systems are more expensive than passive control systems but they offer better control on structures. In order to understand the discussed issue, herein, a comparative study has been performed to evaluated their performances. A detail comparison among passive, active and semi-active control alternatives have been conducted. The outcome shows that the passive control systems can be suitable where deformations are and the other alternatives would be beneficial where large deformations are expected.
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Feng, Shuai, Hiroshi Tagawa, and Xingchen Chen. "Experimental Study of Cylindrical Steel Slit Damper for Passive Energy Dissipation." In Lecture Notes in Civil Engineering, 365–73. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-6368-3_31.

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Roy, Swabarna, Swagato Das, and Purnachandra Saha. "Seismic Control and Performance of Passive Hybrid Damper Under Near-Field Earthquakes." In Lecture Notes in Civil Engineering, 1–13. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5235-9_1.

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Sun, Xiantao, Wenjie Chen, Weihai Chen, and Cungang Hu. "A Dual-Axis Force Sensor with Passive Eddy Current Damper for Precision Measurement." In Advances in Intelligent Systems and Computing, 75–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44267-5_11.

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Alizadeh, Hamed, H. H. Lavasani, Vahidreza Gharehbaghi, Tony T. Y. Yang, and Ehsan Noroozinejad Farsangi. "Smart Control of Flutter of Suspension Bridges Using Optimized Passive Tuned Mass Damper." In Automation in Construction toward Resilience, 523–34. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003325246-25.

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Reich, S., and S. Segla. "Comparison of Passenger Cars with Passive and Semi-Active Suspension Systems Based on a Friction Controlled Damper." In New Trends in Mechanism Science, 405–12. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9689-0_47.

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Madhekar, Suhasini, and Vasant Matsagar. "Metallic Dampers." In Passive Vibration Control of Structures, 219–38. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781315269269-7.

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Madhekar, Suhasini, and Vasant Matsagar. "Tuned Dampers." In Passive Vibration Control of Structures, 133–86. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781315269269-5.

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Conference papers on the topic "Passive damper"

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Bai, Xian-Xu, Sheng Shen, Fei-Long Cai, Shi-Xu Xu, and Xue-Cai Deng. "Mechanical responses of a magnetorheological damper." In Active and Passive Smart Structures and Integrated Systems XII, edited by Alper Erturk. SPIE, 2018. http://dx.doi.org/10.1117/12.2294502.

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Kavlicoglu, Barkan M., Huseyin Sahin, Michael McKee, and Yanming Liu. "Compressible magnetorheological fluid damper (Conference Presentation)." In Active and Passive Smart Structures and Integrated Systems XII, edited by Alper Erturk. SPIE, 2018. http://dx.doi.org/10.1117/12.2297640.

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Gharib, Mohamed, and Mansour Karkoub. "Passive Multi-Degree-of-Freedom Structural Control Using LPC Impact Dampers." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51376.

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Excessive vibration is one of the main reasons leading to partial damage and in some cases collapse of tall buildings and structures. Impact dampers provide an effective, economical, and easy to install solution to the vibration problem in several applications. The latest developed type in the impact dampers family is the Linear Particle Chain (LPC) impact damper. It consists of a linear arrangement of two sizes of freely moving masses, constrained by two stops. This paper presents the results of an experimental investigation on the effectiveness of the LPC impact damper in damping the vibrations of a multi-degree-of-freedom system under different types of excitations. A prototype of the LPC impact dampers is fabricated and tested in our lab using a three-story frame structure. The experimental outcomes clearly show that the LPC impact damper can effectively attenuate the free and forced vibrations of flexible structures.
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Anderson, Eric H. "Interpretation of Active Dampers As Variable-Parameter Passive Devices." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0636.

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Abstract This paper develops analogies between discrete devices that achieve damping by active and passive means. It describes the simplest models useful for inclusion in larger system design. Lumped-parameter models for representing passive dampers are given, and the similarity to local active feedback is shown. A model for active damper components containing piezoelectrics or similar materials is developed for force feedback compensation. This system is similar to the passive damper model when its parameters are allowed to vary. An active damper with direct feedback of the integral of measured force is represented by a model containing a single spring and a gain-dependent dashpot. Further aspects of the active damper are illustrated using a one-mode model of a vibrating structure. The effects of a feedforward modification to the system, and the analogy to changes in passive parameters, are illustrated by tracking the locus of the closed loop system poles with feedback gain.
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Schwarzendahl, Sebastian M., Marcus Neubauer, and Jörg Wallaschek. "Optimization of a passive piezoelectric damper for a viscously damped main system." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Henry A. Sodano. SPIE, 2012. http://dx.doi.org/10.1117/12.915163.

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Matsunaga, Yoshinori, Jun Tagami, Haruhiko Kurino, and Toshikazu Yamada. "High Performance Passive Damper With Ingenious Hydraulic Valve System." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2941.

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Newly developed ingenious hydraulic valve system (MAIKO-Ben) autonomously controls the flow valve opening between two hydraulic chambers utilizing the pressure balance between them without an external power source. This impressive function can create a passive hydraulic damper with high performance equivalent to that of previously developed semi-active damper that can absorb much more structural vibration energy than a conventional passive damper. This damper works a semi-active damper while remaining passive. First, we explain the self-regulating hydraulic mechanism of this valve system. The flow control valve is activated through the hydraulic power accumulated in rather small buffer placed between the two hydraulic chambers, and produces maximum or minimum damping coefficient based on the pressure balance between them. Second, we present the results of dynamic loading tests conducted on a full-scale prototype damper (maximum force: 2MN) under both sinusoidal waves and non-stationary seismic response waves. It is confirmed that the developed device showed excellent energy dissipation capacity as expected, and also that the damper’s dynamic characteristics could be well simulated through simply modeling the above hydraulic mechanism. According to these results, it is verified that the MAIKO-Ben system has enough promise to be applied to the real buildings.
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Choi, Seung-Bok, Ae-Ri Cha, Ji-Young Yoon, and Tae-Hoon Lee. "Design of new prosthetic leg damper for above knee amputees using a magnetorheological damper activated permanent magnet only." In Active and Passive Smart Structures and Integrated Systems XII, edited by Alper Erturk. SPIE, 2018. http://dx.doi.org/10.1117/12.2296760.

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Arfiadi, Y., and M. N. S. Hadi. "Hybrid Base Isolation-Passive Mass Damper Systems." In Eighth International Conference on Computing in Civil and Building Engineering (ICCCBE-VIII). Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40513(279)36.

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Gordon, Sarah, Richard E. Christenson, and Jiong Tang. "Semi-active vibration isolation design using magnetorheological damper." In Active and Passive Smart Structures and Integrated Systems XVIII, edited by Serife Tol, Mostafa A. Nouh, Shima Shahab, Jinkyu Yang, Guoliang Huang, and Xiaopeng Li. SPIE, 2024. http://dx.doi.org/10.1117/12.3011015.

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Tai, Wei-Che. "Optimum Design of a New Tuned Inerter Mass Damper (TIMD) Passive Vibration Control for Stochastically Motion-Excited Structures." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98044.

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Abstract The inerter that is referred to as a two-terminal device that provides resisting forces proportional to the relative accelerations between its two terminals has been widely applied in vibration control due to its mass amplification effect. In this paper, a new inerter-based damper is proposed to take advantage of the inerter, which consists of a rack-pinion inerter in conjunction with a tuned rotational inertia damper. Unlike any other inerter-based dampers, the rotational inertia damper is connected to the pinion of the inerter via a rotational spring and damper. As a result, the weight of the damper can be significantly reduced. The proposed damper is applied to single-degree-of-freedom primary structures and a two-degree-of-freedom structure and the H2 optimization is conducted to obtain the optimum tuning ratio and damping ratio analytically. When comparing the proposed damper with its counterpart reported in the literature, the proposed damper achieves 20% to 70% improvement when their weights are identical.
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Reports on the topic "Passive damper"

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Mills, Evelyn. Christine de Pizan's Passive Heroines: Recoding Feminine Identities in Le Livre de la cité des dames and Le Ditié de Jehanne d'Arc. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7426.

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