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1
Solmazyaghobzadeh, Solmazyaghobzadeh. "Determining the Best Insertion Site of Fluid Viscous Dampers to Optimize and Reduce Incurredcosts in Adjacent Buildings." Modern Applied Science 10, no. 9 (2016): 130. http://dx.doi.org/10.5539/mas.v10n9p130.
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In the past decade, researchers developed the idea of connecting buildings with intelligent activated, semi-active and inactivated damper systemsreduce adjacent buildings response to wind and earthquake. One of the most important damper devices in non-active control is fluid viscous damper.Fluid dampers due to viscous fluidsshow high resistance. High resistance of viscous fluidsagainst the flow is the basicfunctionof fluid viscous dampers. Deformation speed a fluid viscous damper is proportional to the acted forces. Therefore the aim of this paper is to determine the insertion site of fluid viscous dampersto optimize and reduce the consuming costs in adjacent buildings. For this purpose, four different models of connected adjacent buildings with common and different shear stiffness in the software SAP 2000 has been modeled. This study shows that it is not necessarytwo adjacent buildings connected by a damper on all floors, but the less damper in appropriate selected locations can help reduce the earthquake response. And by placing the fluid viscous dampers in selected certainfloors provides more useful structural system for reducing the effects of earthquakes.
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Madgounkar, Sachin Sunil, Naveen Kumar H. S, and Chethan Gowda R. K. "Comparative Study on Seismic Behavior of High–Rise Steel Building with and Without Friction Damper and Fluid Viscous Damper: A Review." International Journal for Research in Applied Science and Engineering Technology 10, no. 8 (2022): 1649–53. http://dx.doi.org/10.22214/ijraset.2022.46373.
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Abstract: Seismic forces are induced on the structure present in earthquake prone areas. These are induced due to the movement of tectonic plates. Multi-storey buildings are those that have more than two stories, hence undergo large amount of deflection due to their slender structure. Due to the deflection caused by the ground accelerations during earthquakes, the structure is unstable and the structure undergoes damage which is not safe. Passive energy dissipation devices are gaining significance in design of earthquake resistant structures because of their effective performance in controlling seismic effects on structures during earthquake. Friction dampers and fluid viscous damper are passive energy dissipating devices which are used widely as seismic control devices. The present study was conducted analytically on a 15-storey steel frame with regular and irregular configuration and performance of structure against non-linear time history ground movement with and without friction damper and fluid viscous damper. Time history ground acceleration data of Bhuj earthquake (2001) were applied on the structure and the response of friction damper and fluid viscous damper was analyzed and compared. The analysis of the structure for the non-linear dynamic ground acceleration was conducted using ETABS software. The results show that when a friction damper is used instead of a fluid viscus damper, storey displacement is greatly reduced by 25.52%. whereas results shows that storey shear, storey drift, and storey acceleration are greatly reduced by 27.75%, 30.39% and 15.27%, when fluid viscous damper is used instead of a friction damper.
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Soheila, Kookalani, and Shen Dejian. "Effect of Fluid Viscous Damper parameters on the seismic performance." Journal of Civil Engineering and Materials Application 4, no. 3 (2020): 141–53. https://doi.org/10.22034/jcema.2020.232288.1025.
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Energy dissipation devices are widely used to enhance the response of structures subjected to dynamic loads caused by wind and earthquake. Especially, viscous dampers are hydraulic devices widely used in structural engineering that dissipate mechanical energy by producing a damping force against the motion. The dampers can mitigate transversal and longitudinal or vertical displacement. It can be set up in different kinds of structures. This study is aimed at comparing the impact of various Fluid viscous damper parameters on the structures under the earthquake. To this aim, a seven-story steel frame structure retrofitted with fluid viscous dampers was considered for analyzing with a variety of parameters. The results showed that installing longitudinal nonlinear Fluid viscous damper can reduce the seismic response significantly, by selecting affordable damping parameters including stiffness, damping coefficient, and velocity exponent. The optimum damping parameters can be calculated accurately by analyzing structure with different damping parameters of nonlinear Fluid viscous damper.
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Jia, Sihui, and Mingzhang Luo. "Monitoring of Liquid Viscosity for Viscous Dampers through a Wireless Impedance Measurement System." Applied Sciences 12, no. 1 (2021): 189. http://dx.doi.org/10.3390/app12010189.
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Viscous dampers are a type of seismic damping equipment widely used in high-rise buildings and bridges. However, the viscosity of the damping fluid inside the viscous damper will change over time during its use, which significantly reduces the seismic performance of the viscous damper. Hence, it is necessary to monitor the viscosity of the fluid inside the damper over its service life. In this paper, a damping fluid viscosity monitoring method based on wireless impedance measurement technology is proposed. A piezoelectric sensor is installed in a damper cylinder specimen, and the viscosity of the damping fluid is determined by measuring the piezoelectric impedance value of the sensor. In this study, 10 samples of damping fluids with different viscosities are tested. In order to quantitatively correlate damping fluid viscosity and electrical impedance, a viscosity index (VI) based on the root mean square deviation (RMSD) is proposed. The experimental results show that the variation of the real part in the impedance signal can qualitatively determine the damping fluid viscosity while the proposed VI can effectively and quantitatively identify the damping fluid viscosity.
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Hussain, Danish, Ashish Shukla, Sunita Bansal, et al. "Seismic Parametric Analysis of RC Multi-Storied Buildings with and Without Fluid Viscous Dampers." E3S Web of Conferences 529 (2024): 01017. http://dx.doi.org/10.1051/e3sconf/202452901017.
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Earthquakes are enormous natural disasters that increase the energy within the structural system, causing catastrophic destruction. Various control systems, such as passive, active, hybrid, and semi active control systems, can be used to dissipate this unwanted energy. The fluid viscous damper is one such dissipation device used in this study. The goal of this project is to use a fluid viscous damper to lessen the seismic response of the Symmetrical and unsymmetrical G+9 structure in ETABS2017. To obtain the seismic response with and without a fluid viscous damper, ETABS2017 was used to analyse symmetrical and unsymmetrical structures with and without a fluid viscous damper. The analysis takes into account nonlinear temporal history, which is derived using fast nonlinear analysis of Electro data. The position and function of dampers are discussed in this study. For seismic evaluation of buildings with and without fluid viscous dampers, the equivalent static approach and response spectrum method are utilised. The structure was examined utilizing ETABs 2017 programming, with seismic zone IV and medium soil (Type II) according to IS 1893-2016. The structure’s exhibition is assessed utilizing story removal, story shear, story float, and modular periods and frequencies. The objective of this study is to about the consequences of static and reaction range examination in both longitudinal and cross over bearings for damper development with and without damper structure.
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Vasile, Ovidiu, and Mihai Bugaru. "A New Modeling Approach for Viscous Dampers Using an Extended Kelvin–Voigt Rheological Model Based on the Identification of the Constitutive Law’s Parameters." Computation 11, no. 1 (2022): 3. http://dx.doi.org/10.3390/computation11010003.
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In addition to elastomeric devices, viscous fluid dampers can reduce the vibration transmitted to dynamic systems. Usually, these fluid dampers are rate-independent and used in conjunction with elastomeric isolators to insulate the base of buildings (buildings, bridges, etc.) to reduce the shocks caused by earthquakes by increasing the damping capability. According to the EN 15129 standard, the velocity-dependent anti-seismic devices are Fluid Viscous Dampers (FVDs) and Fluid Spring Dampers (FSDs). Based on experimental data from a dynamic regime of a fluid viscous damper of small dimensions, for which not all the design details are known, to determine the law of behavior for the viscous damper, the characteristics of the damper are identified, including the nonlinear parameter α (exponent of velocity V) of the constitutive law. Note that the magnitude of the fluid damper force depends on both velocity (where the maximum value is 0.52 m/s) and amplitude displacement (±25 mm). Using the Kelvin–Voigt rheological models, the dynamic response of a structure fixed with a fluid viscous device is analyzed, presenting the reaction force and displacement during the parameterized application of an external shock. This new approach for FVDs/FSDs was validated using the standard deviation between the experimental data and the numerical results of the extended Kelvin–Voigt model offering researchers in the field of seismic devices a reliable method to obtain a constitutive law for such devices.
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Trivedi, Abhay, Dr Gunjan Shrivastava, and Kishor Patil. "Seismic Analysis of Irregular Diaphragm Reinforced Concrete Building with Fluid Viscous Dampers." International Journal for Research in Applied Science and Engineering Technology 11, no. 7 (2023): 1970–76. http://dx.doi.org/10.22214/ijraset.2023.55029.
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Abstract: Fluid viscous damper is the most commonly used tool for controlling structures’ responses. Fluid viscous dampers with different construction technologies are applied in order decrease the responses of structures to the seismic vibrations. During the recent years, controlling structure has turned into a scientific technology to protect structures against wind and earthquake loads. In the present study linear dynamic and non-linear static analysis was adopted to assess the seismic performance of an irregular diaphragm building. Building with and without fluid viscous damper have been taken.The outcomes of the study will be beneficial to assess the performance of existing building vulnerable to seismic loads after the installation of fluid viscous dampers.
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Zhou, P., M. Liu, WM Kong, YM Xu, and H. Li. "Effectiveness of In-Service Dampers over Long-Term Operation for Cable Vibration Suppression: A Study Based on Field Testing." Journal of Physics: Conference Series 2158, no. 1 (2022): 012040. http://dx.doi.org/10.1088/1742-6596/2158/1/012040.
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Abstract In order to explore the operation mechanism of dampers used on super long-span bridges, the characteristics of dampers in long-term operation are studied through field tests. Firstly, viscous damper and liquid leakage MR damper are selected to test the influence of fluid connecting rod on its damping force; Then, wireless and wired sensors are used to collect the acceleration response of cables with viscous dampers and MR dampers. Finally, the vibration characteristics of the cable are analyzed, and the control performance of the selected damper is evaluated. The results show that the high-order multi-modal vibration of the cable will occur in the range of 2-6hz whether the damper is installed or not. In addition, fluid leakage may reduce the additional modal damping ratio achieved by MR damper.
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Waghmare, Manisha V., Suhasini N. Madhekar, and Vasant A. Matsagar. "Influence of Nonlinear Fluid Viscous Dampers on Seismic Response of RC Elevated Storage Tanks." Civil Engineering Journal 6 (December 9, 2020): 98–118. http://dx.doi.org/10.28991/cej-2020-sp(emce)-09.
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The numerical investigation on the seismic response of RC elevated liquid storage tanks installed with viscous dampers is presented. A discrete two-mass model for the liquid and multi-degree of freedom system for staging, installed with the dampers are developed for Reinforced Concrete (RC) elevated liquid storage tanks. The elevated tank is assessed for seismic response reduction when provided with Linear Viscous Damper (LVD) and Nonlinear Viscous Damper (NLVD), installed in the staging. The RC elevated liquid storage tanks are analyzed for two levels of liquid containment in the tank, 100% and 25% of the tank capacity. Three Configurations of placements of dampers viz. dampers at alternate levels (Configuration I and Configuration II) and dampers at all the panels of the staging of the tank (Configuration III) are considered. To study the effect of peak ground acceleration, eight real earthquake time histories with accelerations varying from 0.1 g to 0.93 g are considered. The nonlinearity in the viscous damper is modified by taking force proportional to various velocity exponents. It is found that the nonlinear viscous dampers with lower damping constant result in a comparable reduction in the response of RC elevated liquid storage tank, to that of linear viscous dampers with higher damping constant. A lower damping constant signifies compact the size of the damper. Doi: 10.28991/cej-2020-SP(EMCE)-09 Full Text: PDF
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Song, Yuanjin, Zhong Zhuang, Xianping Wang, Qianfeng Fang, Zhijun Cheng, and Tao Zhang. "Vibration Damping and Noise Reduction of a New Non-Newtonian Fluid Damper in a Washing Machine." Actuators 13, no. 1 (2023): 9. http://dx.doi.org/10.3390/act13010009.
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Due to friction vibration dampers’ inability to effectively dampen low loads during high-frequency dewatering, drum washing machines vibrated intensively. In order to address this problem, in this paper, a novel type of low-cost non-Newtonian fluid damper is proposed and investigated based on the non-Newtonian fluid shear thinning properties’ effect on vibration suppression during the high-frequency dewatering process of the washing machine. In contrast to other commonly used dampers, the homemade non-Newtonian fluid damper significantly suppresses the growth trend of the apparent elastic coefficient at high frequencies. A systematic investigation of damper structural parameters reveals that smaller gap height, higher piston head number, and more viscous fluid viscosity are adequate for vibration suppression and noise reduction. These results demonstrate that the non-Newtonian fluid damper can produce an excellent vibration-damping effect for the entire washing process of the washing machine, especially for the high-frequency dewatering process. The acceleration attenuation ratio can reach up to 83.49%, the energy attenuation is up to 98.44%, and the noise reduction is up to 10.38 dB.
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Zhao, Guo Hui, and Yu Min Zhang. "Parametric Sensitivity Study on Fluid Viscous Damper of Long Span Suspension Bridge." Advanced Materials Research 255-260 (May 2011): 998–1002. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.998.
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Damping coefficient and damping exponent play a dominant role on the displacement constraint effect and the damping force of the fluid viscous damper. In this paper, parametric sensitivity study of the fluid viscous damper is carried out by using nonlinear dynamic time history method based on a long suspension bridge. Acceptable damping force and reasonable displacement between stiffening girder and tower are set as the optimization objectives of the damping parameters. It is shown that: as to long suspension bridge, bigger damping coefficient can lower the displacement but increase the force of the dampers, and the smaller damping exponent can aggravate the trend. Fluid viscous damper can play the biggest role of displacement constraint effect while with little additional seismic force is introduced in the whole structure with suitable damping parameters.
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Jiao, Sujuan, Jiajin Tian, Hui Zheng, and Hongxing Hua. "Modeling of a hydraulic damper with shear thinning fluid for damping mechanism analysis." Journal of Vibration and Control 23, no. 20 (2016): 3365–76. http://dx.doi.org/10.1177/1077546316629264.
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This paper presents an analytical model for computing the force-displacement loops of the passive hydraulic dampers filled with shear thinning fluid when the damper is subjected to a sinusoidal excitation. The analytical model is developed on the basis of Navier-Stokes equations by considering the rheological behavior of silicone oil. The obtained computational results agree well with those by experimental measurements, and both of them suggests that viscous friction, fluid compressibility, and friction loss are the three major damping mechanisms of a hydraulic damper with shear thinning fluid. The damper in a low-frequency and large-amplitude vibration may have bigger viscous damping coefficient than that when it is in a high-frequency and small-amplitude vibration, which suggests that a hydraulic damper filled with shear thinning fluid can satisfy the requirement of the isolation system better.
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Kozytskyi, Sergiy, and Sergii Kiriian. "Dilatant-Fluid Torsional Vibration Damper for a Four-Stroke Diesel Engine Crankshaft." Polish Maritime Research 30, no. 1 (2023): 121–25. http://dx.doi.org/10.2478/pomr-2023-0012.
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Abstract This paper presents a study of a viscous torsional vibration damper for a crankshaft of a four-stroke diesel engine. The reliable operation of a widely used silicone-type viscous damper depends on the ability of the silicone oil to absorb the energy of torsional vibrations. The non-Newtonian shear flow of the silicone oil interlayer, characterised by a reduction in the shear-rate-dependent viscosity and a moment of the drag forces, negatively affects damping characteristics. A torsional vibration damper, filled with a shear-thickening fluid, was considered and a rheological approach, based on viscosity growth with the shear rate increase, was applied. For such a damper, larger velocity gradients correspond to the higher values of a viscous force, which decreases torsional vibration. The parameter of damper effectiveness (defined by the fluid flow index, values of the damper gaps, torsional vibration amplitude and frequency) was implemented. It has been established that the efficiency of the torsional vibration damper filled with a dilatant fluid does not depend on the damper dimensions and gaps and significantly increases when a shear-thickening fluid is used instead of silicone oil or a Newtonian fluid. At higher values of the flow index, when the non-Newtonian flow becomes distinct, torsional vibrations are damped more effectively. Critical vibration amplitudes at high-velocity gradients, in turn, increase the damping effect as the moment of the drag forces and flow index are power-law related.
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Zhang, Cheng, Wenxue Zhang, Lijun Su, Ying Chen, and Xiuli Du. "Theoretical and Experimental Analysis of a Winding Rope Fluid Viscous Damper." Structural Control and Health Monitoring 2023 (April 12, 2023): 1–21. http://dx.doi.org/10.1155/2023/7307224.
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This paper investigated a winding rope fluid viscous damper (WRFVD) that uses the frictional amplification mechanism of a winding rope to obtain the operating characteristics of a viscous damper-like device. The WRFVD combined the advantages of fluid viscous dampers and friction dampers. It not only retained the mechanical characteristics of the fluid viscous damper but also reduced manufacturing costs. First, the construction and working principles of the WRFVD were introduced. A theoretical model that could accurately simulate the hysteretic characteristics of the damper was derived. Then, a series of dynamic tests were performed on six prototypes of the WRFVD. The dynamic performance under different displacement amplitudes and device parameters was analyzed based on the test results. In addition, the theoretical model was validated by experimental results. Finally, a series of parametric analyses of the WRFVD were performed. The experimental results showed that the WRFVD is a type of velocity-dependent damper with smooth and plump hysteretic curves under sinusoidal displacement excitation. Fatigue loading tests showed that the WRFVD had excellent fatigue resistance capacity and stable operational performance. The established theoretical model was reasonable and satisfactorily reproduced the hysteretic properties of the WRFVD. The parametric analyses showed that it was not recommended to improve the performance of the WRFVD by the method of adjusting the damping coefficient and pretightening load. It was reasonable to adjust the performance of the WRFVD by setting a smaller velocity exponent, an appropriate winding turn of winding ropes, and a suitable friction coefficient.
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Zhang, Zhi Qiang, and Fei Ma. "Research on Seismic Response Vibration Hybrid Control of Hefei TV Tower." Advanced Materials Research 243-249 (May 2011): 5197–203. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.5197.
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In this paper, Hefei TV Tower is used as an analytical case to examine the Hybrid control method on seismic response. Firstly, on the basis of the other’s work, a bi-model dynamic model is proposed to study the seismic response vibration hybrid control, using tuned mass damper and viscous fluid dampers. Then the optimal coefficient is obtained by considered the seismic response of upper turret as optimization objectives. According to analysis, it’s showed that the seismic responses of the tower are decreased greatly with tuned mass damper and viscous fluid dampers, and the vibration reduction effectiveness of the tower is sensitive to the spectral characteristics of earthquake wave.
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Nabin, Acharya*. "Influence of Various Arrangements of Viscous Dampers on RCC Framed Buildings." International Journal of Scientific Research and Technology 2, no. 5 (2025): 124–46. https://doi.org/10.5281/zenodo.15345403.
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In recent years, there has been an increase in high-magnitude earthquakes, which has led to a need for research on seismic protection and its importance in safeguarding structures such as buildings and bridges. Adding supplementary damping to the structure can help reduce dynamic responses and base shear demand. Energy dissipation devices such as fluid viscous dampers (FVDs) are often used to mitigate structural sway during seismic activity. The proposed thesis aims to study the effect of a viscous damper on the seismic performance of RCC-framed buildings. In this study, 3-D models of Four and Twelve story RCC frame building structures generated in the ETABs finite element package with and without diagonally placed viscous dampers in different configurations and placed in various locations throughout the structure will be subjected to earthquake loadings and the study will be carried out to investigate the influence of viscous damper configuration and location. The results obtained will also be used to identify optimal damper arrangement and placement for seismic mitigation. The results of the seismic performance of buildings with viscous dampers will be compared with the buildings without viscous dampers. The ETABs software will be used for modeling and analyzing various structures with and without viscous dampers and non-linear time history analysis methods will be adopted. The results obtained will be compared in the form of displacement, story drift, and Base shear. Also, the comparison of energy dissipation of dampers in different arrangements will be done in terms of link damper energy. One of the primary findings from the study underscores the crucial role of the damping system in enhancing the seismic resilience of the building. The research also confirms that integrating fluid viscous dampers into the structure leads to notable reductions in key structural metrics like displacement, drift, and shear. Moreover, the damping system substantially diminishes the building's susceptibility to seismic damage.
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Sherin, P. Samuel* Surya Sasidharan. "SEISMIC ANALYSIS OF BUILDINGS USING FLUID VISCOUS DAMPER." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 4 (2017): 267–72. https://doi.org/10.5281/zenodo.546333.
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Now a day’s Earthquakes are happening in various parts of the earth. So buildings should be designed and constructed in such a manner that they will withstand the earthquakes. Non linear seismic assessment is a good tool in helping us to predict the seismic capacity. Many devices are used to improve the seismic capacity of the buildings. In order to reduce the negative impacts of earthquakes, different kinds of protective system have been adopted in the structures worldwide. Placement of fluid viscous damper is one of the techniques in which it absorbs the shock vibrations of the building which causes damage. The effect of damper on the seismic response of the RC structures is studied in this. Little attention has been paid to evaluating the influence of the number and placement of dampers on the dynamic response Three dimensional models are created using SAP2000. Time History analysis is carried out to study the effect of damper on the time period, base shear and acceleration in RC structures.
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Düzgün, Oğuz Akın, Yavuz Selim Hatipoğlu, and Osman Ünsal Bayrak. "Optimum parameters for adjacent frames coupled by fluid viscous dampers considering soil-structure interaction." Challenge Journal of Structural Mechanics 9, no. 1 (2023): 12. http://dx.doi.org/10.20528/cjsmec.2023.01.002.
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In this paper, the optimum conditions which ensure that the resulting minimum base shear force and minimum roof displacement for two adjacent frame structures interconnected by fluid viscous dampers, including soil-structure interaction (SSI) effects under seismic excitation were presented. A two-dimensional (2D) finite element analysis was carried out with the Taguchi method. As non-reflecting boundaries, viscous boundary conditions were used on the edges of finite soil region. An optimization study was carried out for four parameters such as soil type, height ratio of the frames, damping coefficient of viscous damper, and the location of the viscous damper each with four levels. The optimum conditions which minimize maximum roof displacements and the maximum base shear forces have been obtained. The most affecting parameter on the system response was found to be soil type. It was also found that the sufficient damping coefficient of the viscous damper is equal to 1x105 N.s/m for minimum response. The minimum system response can be achieved by using only one damper. It can be drawn that the Taguchi method can be used with the finite element (FE) method for determining optimum conditions of a soil-structure system for minimum system response.
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Chmielowiec, Andrzej, Adam Michajłyszyn, and Wojciech Homik. "Behaviour of a Torsional Vibration Viscous Damper in the Event of a Damper Fluid Shortage." Polish Maritime Research 30, no. 2 (2023): 105–13. http://dx.doi.org/10.2478/pomr-2023-0026.
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Abstract This article presents the analysis of a damping fluid deficiency in a torsional vibration viscous damper. The problem is analysed both qualitatively and quantitatively. Experimental results are presented, showing what happens to the damper in a situation where the design of the housing is inadequate and the inertia forces prevent the formation of an oil film. In addition, the article deals with the problem of the proper design of the oil channel and the dimensions required to enable the damper to operate reliably. The results of the article may be useful to the constructors of torsional vibration viscous dampers for marine engines.
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Dadkhah, Hamed, and Mohtasham Mohebbi. "Performance assessment of an earthquake-based optimally designed fluid viscous damper under blast loading." Advances in Structural Engineering 22, no. 14 (2019): 3011–25. http://dx.doi.org/10.1177/1369433219855905.
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Terrorist attacks and explosion devices are one of the growing worldwide threats which seriously threaten the safety of strategic structures. The aim of this study is assessing the performance of the linear fluid viscous damper optimally designed based on seismic loading under blast loading. To this end, the control system is first optimally designed under different earthquakes and the performance of the optimally designed fluid viscous damper is evaluated under different external blast scenarios. In order to design the optimal fluid viscous damper for seismic loading, the design problem is transformed into an optimization problem that the genetic algorithm has been used to solve the optimization problem and determine the optimal values of design variables. The fluid viscous damper configuration including size and distribution has been considered as the design variables and the design objective has been defined to keep the structure behavior in the elastic range with a minimum control cost. The optimization results show that the total added optimal damping is dependent on earthquake record, while in this case study the optimal distributions of the fluid viscous damper under earthquake records are not so different. The performance assessment of the earthquake-based optimally designed fluid viscous damper under blast loading shows its effectiveness in achieving the desired design objective. Therefore, in this case study, the fluid viscous damper designed for seismic loading can be considered as a well-designed control system under multi-hazard of blast and earthquake.
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Pourali, Javad. "Investigating the effectiveness of fluid viscous damper in reducing the effect of seismic sequence on steel bending frame designed on type c soil." Journal of Civil Engineering Researchers 5, no. 2 (2023): 46–54. http://dx.doi.org/10.61186/jcer.5.2.46.
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Aftershocks can always cause the collapse of structures damaged by the main earthquake. In this article, the seismic performance of an 8-story steel bending frame designed in c-type soil was first subjected to the seismic sequence of an earthquake and an aftershock, and then the same building with the addition of a fluid viscous damper (Fluid Viscous Damper) was evaluated. The results showed that the seismic performance of the studied frame under the effect of severe aftershocks with the presence of a liquid viscous damper is very different from the case without FVD. For example, the maximum displacement of the structural floors was reduced by 60% compared to the case without a damper. It was also found that while most of the aftershocks in buildings without dampers cause a significant increase in the permanent displacement of the roof, in the presence of dampers, this amount has decreased significantly, although in general, the damage caused by the effect of aftershocks on the building is much more az It will be from a state in which the structure is only subjected to the main earthquake
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Guo, Qiang, Yan Bei Chen, Xiang Liang Ning, and Lu Tang. "Speedy Design Method for Fluid Viscous Dampers Based on Numerical Simulation by CFD." Advanced Materials Research 446-449 (January 2012): 3869–74. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.3869.
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Bi-directional-cylinder viscous fluid dampers are studied numerically. Based on the power-law characteristic of silicone oil，the flow pattern of silicone oil is analyzed, the non-Newtonian fluid power-law model’s influence on the energy dissipation characteristic and the damping resistance of viscous dampers is discussed, and the calculation formulas are presented. The damping force of the viscous damper samples is simulated by professional CFD software based on the dynamic mesh model, Based on comprehensive analysis of the results, the experiential design method of large-tonnage-damping-force viscous fluid dampers is finally established. On the other hand, the numerical simulation curves are in good agreement with experimental curves, which validates the feasibility of numerical method in the preliminary design of bi-directional-cylinder viscous fluid dampers. The numerical method helps to enhance the engineering precision, guide the design, and shorten the development cycle.
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Zhong, Jian, Zhangliang Hu, Wancheng Yuan, and Liang Chen. "System-based probabilistic optimization of fluid viscous dampers equipped in cable-stayed bridges." Advances in Structural Engineering 21, no. 12 (2018): 1815–25. http://dx.doi.org/10.1177/1369433218756429.
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This study presents a methodology to evaluate the optimal parameters of fluid viscous damper for cable-stayed bridges using the system-level fragility assessment approach. Instead of investigating the impact of different isolation devices on the component’s vulnerability separately, this study focuses on evaluating the optimal parameters of fluid viscous damper to achieve the best overall performance of cable-stayed bridge as a system. Numerical model of a cable-stayed bridge with the most common configuration in China is established using OpenSEES that can account for their nonlinear response and uncertainty treatment. A joint probabilistic seismic demand model and Monte Carlo simulation are employed to obtain the system fragility of cable-stayed bridges by accounting for the contribution of multicomponents to the global damage state. The system-level fragility curves and component fragility curves are compared before and after the application of fluid viscous damper with different parameters. The results indicate that a given parameter of the fluid viscous damper may have a negative impact on some components, yet lead to a better performance of the bridge as a system. Thus, in order to obtain comprehensive knowledge of bridge performance and derive the accurate optimal parameters of fluid viscous damper, it is necessary to consider the fragility based on bridge system.
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Hazaveh, Nikoo K., Ali A. Rad, Geoffrey W. Rodgers, J. Geoffrey Chase, Stefano Pampanin, and Quincy T. Ma. "Shake Table Testing of a Low Damage Steel Building with 2-4 Displacement Dependent (D3) Viscous Damper." Key Engineering Materials 763 (February 2018): 331–38. http://dx.doi.org/10.4028/www.scientific.net/kem.763.331.
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To improve seismic structural performance, supplemental damping devices can be incorporated to absorb seismic response energy. The viscous fluid damper is a well-known solution. However, while they reduce displacement demand, they can increase overall base shear demand in nonlinear structures as they provide resistive forces in all four quadrants of force-displacement response. In contrast, Direction and Displacement Dependent (D3) viscous fluid dampers offer the opportunity to simultaneously reduce structural displacements and the total base-shear force as they only produce resistive forces in the second and fourth quadrants of a structural hysteresis plot. The research experimentally examines the response of a half-scale, 2-storey moment frame steel structure fitted with a 2-4 configuration D3 viscous fluid damper. The structure is also tested with conventional viscous dampers to establish a baseline response and enable comparison of results. Dynamic experimental tests are used to assesses the base shear, maximum drift and residual deformation under 5 different earthquakes (Northridge, Kobe, Christchurch (CCCC), Christchurch (CHHC), and Bam ground motion). Response metrics including base shear, the maximum structural displacement, and peak structural accelerations are used to quantify performance and to assess the response reductions achieved through the addition of dampers. It is concluded that only the 2-4 device is capable of providing concurrent reductions in all three of these structural response metrics.
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Jia, Jiu Hong, and Hong Xing Hua. "Test Verification of a Design Method for a Fluid Viscous Damper." Advanced Materials Research 291-294 (July 2011): 2085–88. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2085.
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Vibration protection of pipes in nuclear power plants is a critical factor for the safety of the whole plant. In order to improve the anti-shock ability of pipes in nuclear power plants, the application feasibility of the fluid viscous damper in the plant piping protection is investigated. Then a damper design model intended to be used in nuclear power plants is researched by shock tests. Moreover, the parameters in the mathematical model are analyzed. From the analysis results, the conclusion can be drawn that the design method can be used to calculate the physical dimensions of dampers.
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Chen, P. Y. P., and E. J. Hahn. "Use of computational fluid dynamics in hydrodynamic lubrication." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 212, no. 6 (1998): 427–36. http://dx.doi.org/10.1243/1350650981542236.
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This paper demonstrates the suitability of using computational fluid dynamics software for solving steady state hydrodynamic lubrication problems pertaining to slider bearings, step bearings, journal bearings and squeeze-film dampers under conditions of constant unidirectional or rotating loading. The relevance of the inertia and viscous terms which are neglected in the derivation of the Reynolds equation are briefly investigated for the above bearing and damper configurations and it is shown that the neglected viscous terms have negligible effect whereas the inertia effect predictions agree reasonably well with those reported in the literature.
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Weber, Felix, Simon Spensberger, Florian Obholzer, Johann Distl, and Christian Braun. "Semi-Active Cable Damping to Compensate for Damping Losses Due to Reduced Cable Motion Close to Cable Anchor." Applied Sciences 12, no. 4 (2022): 1909. http://dx.doi.org/10.3390/app12041909.
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The relative motion of transverse cable dampers is smaller than predicted by the taut string model because of the effects of bending stiffness and fixed support conditions. As a result of the reduced damper motion, the dissipated energy per cycle is reduced as well, which may explain why damping measurements on real stay cables with transverse dampers often show lower cable damping ratios than expected from the taut string theory. To compensate for the reduced damper motion and damper efficiency, respectively, a semi-active cable damper is proposed. The controllable damper is realized by a hydraulic oil damper with real-time controlled bypass valve whereby the resulting damper force is purely dissipative. The proposed control law is clipped viscous damping with negative stiffness. The viscous coefficient is adjusted in real time to the actual frequency of vibration to generate optimum modal damping while the negative stiffness component partially compensates for the reduced damper motion due to the flexural rigidity and fixed support conditions of the cable. The measurements of the prototype semi-active hydraulic damper are used to derive a precise model of the semi-active damper force including the control force constraints due to the fully open and fully closed bypass valve. This model is used to compute the cable damping ratios of the first four cable modes, for typical damper positions, for a taut string model and for a cable model with flexural rigidity and fixed supported ends. The obtained cable damping ratios are compared to those resulting from the passive linear viscous damper being optimized to the first four cable modes. The results demonstrate that the proposed semi-active cable damper with the consideration of the minimum and maximum control force constraints significantly enhances the cable damping of the first four modes compared to the linear viscous damper.
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Rouhani, Behzad, Reza Aghayari, and Seyed Amin Mousavi. "Fluid viscous dampers in tackle-damper configuration: An experimental study." Engineering Structures 321 (December 2024): 118927. http://dx.doi.org/10.1016/j.engstruct.2024.118927.
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Narkhede, Dilip I., and Ravi Sinha. "Influence of shock impulse characteristics on vibration control using nonlinear fluid viscous dampers." Journal of Vibration and Control 23, no. 9 (2015): 1463–79. http://dx.doi.org/10.1177/1077546315594062.
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Energy dissipating damping devices such as fluid viscous dampers (FVDs) often have applications in shock vibration control of structural and mechanical systems. Nonlinear FVDs are more suitable compared to the linear FVDs for applications where large force and velocities are exerted, such as in structures subjected to shock excitations. This paper discusses the influence of shock impulse characteristics on vibration control of a single-degree-of-freedom system with linear and nonlinear fluid viscous dampers for three types of shock excitation profile, viz. half-cycle sine, initial-peak saw tooth and rectangular. The following response parameters have been considered: (1) maximum acceleration of the structure, (2) maximum displacement of the structure, and (3) time required for attenuation of response below a specified threshold. An approximation based on the concept of equal energy dissipation to determine the response of the structure with nonlinear fluid viscous dampers subjected to shock excitation has been proposed. The paper also presents non-dimensional design charts for above shock pulses for linear and nonlinear fluid viscous dampers, which can be used for preliminary decision on damper parameters to be used in design.
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Zhang, Yunlong, Weizhi Xu, Shuguang Wang, Dongsheng Du, and Yan Geng. "Mechanical Modeling of Viscous Fluid Damper with Temperature and Pressure Coupling Effects." Machines 12, no. 6 (2024): 366. http://dx.doi.org/10.3390/machines12060366.
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During long-duration dynamic loads, such as wind loads or seismic effects, the internal temperature and pressure of a damping cylinder escalate rapidly, which induce shifts in the mechanical attributes of viscous fluid dampers (VFDs). This study investigated the mechanical performance of VFD considering the coupling effects of temperature and pressure under long-duration loads. First, we analyzed the mechanical and energy-dissipation performances of the dampers based on the dynamic mechanical tests considering different loading frequencies, displacement amplitude, and loading cycles. The experimental results indicated that both temperature and pressure influenced the output of the dampers, and in the sealed environment of the damper pip, temperature and pressure exerted mutual influence. Furthermore, the relationship between the damping coefficient and temperature–pressure coupling effects was obtained. Subsequently, an improved mathematical model for the mechanical performance of a gap-type VFD was proposed by considering the macroscopic energy balance of the entire fluid within the damper. Finally, the accuracy of the mathematical model for VFD under long-duration dynamic loads was validated by comparing the computational results with the experimental data.
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Satria, E., L. Son, M. Bur, and M. Dzul Akbar. "Finite Element Analysis to Determine Stiffness, Strength, and Energy Dissipation of U-Shaped Steel Damper under Quasi-Static Loading." International Journal of Automotive and Mechanical Engineering 18, no. 3 (2021): 9042–50. http://dx.doi.org/10.15282/ijame.18.3.2021.16.0693.
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In seismic areas, the application of structural dampers becomes compulsory in the design of buildings. There are various types of dampers, such as viscous elastic dampers, viscous fluid dampers, friction dampers, tune mass dampers, yielding/ metallic dampers, and magnetic dampers. All damper systems are designed to protect structural integrities, control damages, prevent injuries by absorbing earthquake energy, and reduce deformation. This paper is a part of research investigating the behaviour of the U-shaped steel damper (as one type of metallic damper) that can be applied to the buildings in seismic areas. The dampers are used as connections between the roof and supporting structure, with the two general purposes. The first is to control the displacement of roof under an earthquake, and the second is to absorb seismic energy through the plasticity of some parts in dampers. If a strong earthquake occurs, the plasticity will absorb the seismic energy; therefore, heavy damage could be avoided from the roof’s mainframes. In this paper, several models of U-shaped steel dampers are introduced. Several parameters, such as elastic stiffness, maximum strength, and energy dissipation, are determined under two conditions. Firstly, static analysis of the proposed damper under variation of U-steel plate configurations, searching the model with more significant energy dissipation. Secondly, static analysis of the unsymmetrical and symmetrical damper under different loading directions. An in-house finite element program that involves both geometrical and material nonlinearities is developed as a problem solver. A quasi-static lateral loading is given to each model until one cycle of the hysteresis curve is reached (in the displacement range between -20 mm to +20 mm). The above parameters are calculated from the hysteresis curve. From the results, the behaviour of the U-steel damper can be described as follows. Firstly, increasing the energy dissipation in the lateral direction can be done by increasing the lateral stiffness of the damper. However, it can reduce the maximum elastic deformation of the damper. Secondly, under the random direction of loading, a symmetrical shape can increase the energy dissipation of the damper.
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Nie, Song-lin, De-kui Xin, Hui Ji, and Fang-long Yin. "Optimization and performance analysis of magnetorheological fluid damper considering different piston configurations." Journal of Intelligent Material Systems and Structures 30, no. 5 (2019): 764–77. http://dx.doi.org/10.1177/1045389x19828526.
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This article presents the design and multi-physics coupling analysis of a shear-valve-mode magnetorheological fluid damper with different piston configurations. The finite element model is built to study the effects of the shape of the piston slot and magnetism-insulators at both ends of the piston yoke on the performance of the magnetorheological damper. Particle swarm optimization and finite element simulation are combined to optimize the structural parameters of the magnetorheological damper. The influences of different piston configurations on the magnetic flux density in the working gap, the shear stress, the viscous stress, and the dynamic range are investigated. The simulation results reveal that the magnetorheological damper, in which the corners of the piston slot are chamfered and the edges of the magnetism-insulators are filleted, exhibits a better damping performance. Furthermore, magnetorheological dampers with and without magnetism-insulators are fabricated. The influences of control current, displacement, and velocity on the mechanical performance of the magnetorheological dampers are experimentally investigated, and the experiment results are in accordance with the theoretical derivation and finite element simulation results.
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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 (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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Bhadke, Prof Sanjay. "Seismic Analysis and Design of Multi Storey RC Buildings with and without Fluid Viscous Dampers." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (2021): 53–57. http://dx.doi.org/10.22214/ijraset.2021.36241.
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Earthquakes are one among the foremost destructive of natural hazards. Earthquake occurs due to sudden transition motion of the ground as a result of release of energy in a matter of few seconds. This recent events remind us of the vulnerability of our society to natural hazards. The protection of civil structures, including material content and human occupants is, doubtless, a worldwide priority. The challenge of structural engineers is to raised withstand these natural hazards. In the present study reinforced concrete moment resisting frame building of G+20 are considered. The building is taken into account to be located in the seismic zone (v) and intended for commercial purpose. Model-I Building without dampers, Model-II –Building with dampers. The building of G+20 has been modeled by providing with and without damper providing all parameters using S A P 2 0 0 0 software. Results show that using fluid viscous dampers to putting together effectively reduce the building responses by selecting optimum damping coefficient i.e. when the building is connected to the fluid viscous dampers (FVD) can control both displacements and accelerations of the building. Further damper at appropriate locations can significantly reduce the earthquake response.
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Nusyirwan, Nusyirwan. "METODE PENURUNAN RESPON DINAMIK SISTEM POROS-ROTOR DENGAN PEREDAM VISCOUS ROTARY." POROS 12, no. 2 (2014): 112. http://dx.doi.org/10.24912/poros.v12i2.563.
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Abstract: Viscosity or viscosity is one of the quantities that are very important in the analysis of the behavior and movement of fluids that come into contact with other objects such as solids {solid body). Viscous dampers can be used to reduce the amplitude of the response due to the unbalanced mass, rotation critically, noise and shock loads. Absorbers working with fluid film bearing securities which are placed at a certain point, which is connected to the shaft-rotating rotor. Certain viscosity fluid will be forced to pass through a narrow slit with a certain pressure that can absorb the energy supplied by the shaft, this damping effects that can provide resistance to the rotor shaft system because the fluid has a linear damping and damping effect histeriktik. Viscous dampers can be used to reduce vibration amplitude response at a fixed price in accordance with the physical nature of the damper, the use of viscous dampers are widely used to control engine speed and turbine rotational speeds are like a helicopter rotor. From the test we can produce the damping effect on the engine rotation can reduce the response time domain vibration with an amplitude reduction of approximately 60% for the damping ratio ζ = 0.5.
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Fathima, Sharmila, Asan Gani Abdul Muthalif, and Md Raisuddin Khan. "Investigation of Annular Gap Size for Optimizing the Dynamic Range of MR Damper Using Comsol Multiphysics Software." Applied Mechanics and Materials 606 (August 2014): 187–92. http://dx.doi.org/10.4028/www.scientific.net/amm.606.187.
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Magneto-rheological (MR) fluid technology has made it possible to develop reliable, revolutionary vibration control systems for a variety of commercial, medical and military applications. MR fluid shock absorber systems are enabled by remarkably versatile MR fluid technology, which allows the system to respond instantly and controllably to varying levels of vibration or shock with simple, robust designs. This paper presents a parametric study of the MR dampers for semi-active vibration control. The influence of gap size of the damper on the viscous stress of the MR fluid is examined. It is inferred from the study that the viscous stress of the MR fluid for different parameters such as gap size influences the dynamic range of MR fluid dampers.The simulated results depict a maximum viscous stress of 1765.441 N/m2for a gap size of 1.85 mm. The developed dynamic range would allow for smaller size of the device, higher dynamic yield stress and low power consumption. The simulated results using COMSOL multiphysics for the verification of the parametric strategy have been presented. Results of this study shall enhance the design of MR dampers for different control applications.
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Chew, Chee-Meng, Geok-Soon Hong, and Wei Zhou. "Series damper actuator system based on MR fluid damper." Robotica 24, no. 6 (2006): 699–710. http://dx.doi.org/10.1017/s0263574706002876.
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In our recent work, we have proposed a novel force control actuator system called series damper actuator (SDA). We have since built an SDA system based on magneto-rheological fluid (MR) damper. In this paper, the dynamics property of SDA system based on the MR fluid damper (SMRDA) is investigated. The effect of the extra dynamics introduced by the MR fluid damper is revealed by comparing the SMRDA with the SDA system based on a linear Newtonian viscous damper (SNVDA). To linearize the constitutive property of the MR fluid damper, a modified Bingham model is proposed. A force feedback control loop is implemented after the linearization. An experimental SMRDA is built to illustrate the performance of the SDA system.
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Khromova, Galina, Malika Makhamadalieva, and Sergey Khromov. "Generalized dynamic model of hydrodynamic vibration dampener subject to viscous damping." E3S Web of Conferences 264 (2021): 05029. http://dx.doi.org/10.1051/e3sconf/202126405029.
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Use as an elastic body of the working fluid improves the efficiency of the hydraulic damper, reliability, and durability, in this case, the issues of improving the reliability of existing locomotives hydraulic dampers by upgrading separate the components for major repairs with the extension of the useful life are relevant. To increase the efficiency of damping dynamic vibrations and reduce the load on the support units and running gear elements, a modernized design of a hydro friction damper with improved damping properties was developed, for which an application was filed for the Patent of the Republic of Uzbekistan for Invention No. IAP 2021 0002.
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Choi, Young-Tai, and Norman M. Wereley. "Flow Mode Magnetorheological Dampers with an Eccentric Gap." Advances in Mechanical Engineering 6 (January 1, 2014): 931683. http://dx.doi.org/10.1155/2014/931683.
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This paper analyzes flow mode magnetorheological (MR) dampers with an eccentric annular gap (i.e., a nonuniform annular gap). To this end, an MR damper analysis for an eccentric annular gap is constructed based on approximating the eccentric annular gap using a rectangular duct with a variable gap, as well as a Bingham-plastic constitutive model of the MR fluid. Performance of flow mode MR dampers with an eccentric gap was assessed analytically using both field-dependent damping force and damping coefficient, which is the ratio of equivalent viscous field-on damping to field-off damping. In addition, damper capabilities of flow mode MR dampers with an eccentric gap were compared to a concentric gap (i.e., uniform annular gap).
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Prawiro, Radius, Rafki Imani, and Nanda Nanda. "NUMERICAL ERROR METHOD TO DETERMINE THE EFFICIENCY OF REDUCING VIBRATIONS DUE TO EARTHQUAKE LOADS ON BUILDINGS USING FLUID VISCOUS DAMPER." BAREKENG: Jurnal Ilmu Matematika dan Terapan 18, no. 4 (2024): 2273–82. http://dx.doi.org/10.30598/barekengvol18iss4pp2273-2282.
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According to The Indonesian Earthquake Map, Padang City in West Sumatra is in Earthquake zone 6. This indicates that Padang City is very vulnerable to earthquakes. Meanwhile, developments in the construction of high buildings also continue to show progress all the time. The main problem that is often faced is the issue of structural damage due to earthquakes. Efforts are needed in earthquake engineering on buildings so that collapse can be minimized. The earthquake damping system used is FVD (Fluid Viscous Dampers) with different types. The Type-A damper is FVD-750 kN and the Type-B damper is FVD-1000 kN, and without using a damper. This research aims to analyze the efficiency of reducing earthquake loads such as floor displacement and vibration period of an 18-story building structure 18 meters high from the base.The analysis method used is a numerical method by calculating earthquake load reduction based on numerical error analysis from the two types of dampers used on structures without using dampers. Building planning refers to SNI 1727-2013, SNI 1726-2019, and SNI 2847-2019, and is assisted by ETABS software. Based on SNI 1726-2019, earthquake risk category II, soft soil condition type (SE), earthquake acceleration response value SDS = 0.745g and SD1 = 0.784g are obtained. The earthquake load used is a dynamic load, taking into account that the condition of the building is irregular. Based on the results of the analysis, it was found that the displacement between floors using the Type-AFVD Damper could reduce the displacement by up to 45.72% and with the Type-B FVD Damper it could reduce the displacement by up to 92.72%. Meanwhile, the period of vibration natural using a Type-A FVD Damper can be reduced by up to 12.34% and using a Type-B FVD Damper can be reduced by up to 33.21%.
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G S, Arun Kumar, and Jagadish G. Kori. "Seismic Response Control of High-Rise Mass Varied Structures Using Linear Fluid Viscous Damper." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (2022): 2173–84. http://dx.doi.org/10.22214/ijraset.2022.42786.
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Abstract: Seismic event induces undesirable motion in buildings, energy dissipation systems in civil engineering are indeed needed. There is a mix of structures with passive energy dissipation supplied by Fluid Viscous Dampers systems (FVD). This technology is increasingly being utilized to improve seismic protection for both existing and new structures. The findings of the FVD systems are investigated in order to compare the structural response with and without this device of energy dissipation compared for low and high rise structures, the damper installed at different storey and varying the coefficient of damping (Cd) has been focused in this paper which provides an insight when the variation of Cd and its locations,. The findings of the FVD's impressive ability to increase the structure's dissipative capabilities without increasing its stiffness. In the case of high rise FVD performance has been evaluated through the top storey displacements which will allow for a conclusion. Keywords: Coefficient of Damping, Fluid Viscous Damper, High Rise Buildings, Seismic Response, Tall Structure
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Li, Jin Hai, and Song Lin Zhang. "A New Type of Nonlinear Viscous Damper." Applied Mechanics and Materials 220-223 (November 2012): 1934–38. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1934.
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In order to satisfy the needs in engineering practice，a new type of nonlinear viscous damper with conical valves is developed. There is a through hole and two valves in the piston of the damper. When the damper work, the fluid flows throw the hole and the regulators, then the energy is consumed. The regulators open because of the pressure difference and adjust their sizes to control the damping force to get just the effect we wanted.
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Baikhan, Sairam, D. Karunakar, G. Mallikarjuna Rao, and Oggu Praveen. "Optimization of Fluid Viscous Damper Diagonal & Combined Bracing Arrangement in G+9 RCC Structure." IOP Conference Series: Earth and Environmental Science 1086, no. 1 (2022): 012024. http://dx.doi.org/10.1088/1755-1315/1086/1/012024.
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Abstract earthquake event is changeable by nature, which has the capacity make devastating operational damage to a structure and collapse in due course which leads the huge loss of life and huge structure property loss. Because of this, much realization has initiated by many researchers for the progress of structural rheostat techniques such as passive controlling and active controlling system which are associated in the systems of Tuned Mass Damper, Fluid Viscous Dampers, Base Isolation inhibiters etc. In this study an experimentation has been carried by in view of G+9 reinforced concrete structure with in the proliferation of quake analysis in SAP-2000. The G+9 RCC structure has been analyzed by means of the connection of fluid viscous dampers situated at numerous patterns in two various systems such as diagonal bracing and combined bracing system by a total of 30 types has been espoused by trial based in various stimulating patterns. The efficiency of that analyzed structural models had better be clearly pragmatic by means of the resultant structural performances, for instance lateral displacement, energy dissipation, storey drift and base response etc. The finest optimum arrangement of fluid viscous dampers had recommended to use for seismic response resistant structure for vibrating control system.
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Harshwardhan V. Gudape, S. K. Kulkarni, S. B. Javheri. "Analysis of Multi-Storied Buildings with the Use of Coupled Shear Walls." Tuijin Jishu/Journal of Propulsion Technology 44, no. 5 (2023): 668–76. http://dx.doi.org/10.52783/tjjpt.v44.i5.2526.
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The present study focuses on the use of coupled shear walls with and without dampers for resisting seismic loads. Multistory structures with and without shear walls are analysed. Different parameters, such as the structure's base shear, storey drift, storey displacement, storey stiffness, and storey shear, are evaluated, and a comparative study is performed. It is observed that coupled shear walls with fluid viscous dampers reduce storey drift by 24% and storey displacement by 45% when compared to buildings without shear walls. A coupled shear wall with a damper has a 29% higher stiffness than a coupled shear wall without a damper, thus performing effectively in resisting lateral forces induced by an earthquake.
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Li, Daojing, Rui Xu, Qiuyan Dong, and Yanlong Xu. "Design and application of composite lanchester damper for milling thin-walled part." Journal of Physics: Conference Series 2760, no. 1 (2024): 012070. http://dx.doi.org/10.1088/1742-6596/2760/1/012070.
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Abstract Thin-walled parts often produce chatter during mechanical processing due to their poor stiffness. Increasing damping can effectively improve the equivalent stiffness of thin-walled parts and weaken the vibration generated during the machining process. Based on the principles of fluid viscous damping and eddy current damping, this article proposes a design scheme for a composite viscous damper. It optimizes the structural parameters of the composite Lanchester damper according to the optimal damping coefficient. Finally, a composite viscous damper was manufactured, and modal tests showed that the amplitude of the first three vibration modes decreased by 83%, 90%, and 85% after installing the damper. In the milling test, the vibration amplitude of the thin-walled part decreased by the highest of 77%.
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Moore, J. J., A. B. Palazzolo, R. Gadangi, et al. "A Forced Response Analysis and Application of Impact Dampers to Rotordynamic Vibration Suppression in a Cryogenic Environment." Journal of Vibration and Acoustics 117, no. 3A (1995): 300–310. http://dx.doi.org/10.1115/1.2874452.
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A high speed damper test rig has been assembled at Texas A&M University to develop rotordynamic dampers for rocket engine turbopumps that operate at cryogenic temperatures, such as those used in the space shuttle main engines (SSMEs). Damping is difficult to obtain in this class of turbomachinery due to the low temperature and viscosity of the operating fluid. An impact damper has been designed and tested as a means to obtain effective damping in a rotorbearing system. The performance and behavior of the impact damper is verified experimentally in a cryogenic test rig at Texas A&M. Analytical investigations indicate a strong amplitude dependence on the performance of the impact damper. An optimum operating amplitude exists and is determined both analytically and experimentally. In addition, the damper performance is characterized by an equivalent viscous damping coefficient. The test results prove the impact damper to be a viable means to suppress vibration in a cryogenic rotorbearing system.
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Tahiri, M., A. Khamlichi, and M. Bezzazi. "Vibration suppression for high speed railway bridges using fluid viscous dampers." MATEC Web of Conferences 286 (2019): 01002. http://dx.doi.org/10.1051/matecconf/201928601002.
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The results of experimental and theoritical investigations of railway bridges have shown the significant dynamic responses exceeding that anticipated on certain railway bridges, such as a resonance phenomenon who have a great effect in the bridge. Alternatively , the use of structural control systems devices might be a very promising solution to attenuate undesirable vibration. The aim of this study, first, is to investigate the posibility of reducing the acceleration in an acceptable level by using fluid viscous dampers. The bridge-damper system is described by a single-degree-of-freedom model. The ,dampers are connected between the bottom surface of the bridge deck and the abutment, Finallay a linearisation model and a comparative study in order to investigate the effect of the nonlinearite of the device in the dynamic response of the system.
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Jadhav, Abhijitkumar, Sanjay Zope, Ravindra Malagi, and Deepali Suryawanshi. "Design and development of a novel tunable electrorheological fluid (ERF) damper-foundation to attenuate residual vibrations in machine tools." FME Transactions 51, no. 1 (2023): 1–13. http://dx.doi.org/10.5937/fme2301001j.
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Residual vibrations in machine tools hamper accuracy and productivity. The attenuation of residual vibrations has been an industrial concern for decades. Meanwhile, the residual vibrations' vibration pattern reveals that the support foundation's damping capabilities predominantly influence them. Therefore, inserting dampers in any other location on a machine tool (such as a machine column) is ineffective. Hence, the scope of inserting the damper into the machine foundation needs to be verified. However, conventional machine mounting systems (concrete foundation and rubber mounts) equally respond to all variable inputs. Both these flocks resulted in inadequate dampening and perhaps poor accuracy. This paper provides a first-generation model of a semiactive-viscous damper (ERF damper-foundation) with tunable damping facilitating machine installation. Controlled experimentation by exposing the developed damper foundation to excitations of medium duty lathe machine confirms its effectiveness and obtains over 48% attenuation compared to a conventional concrete foundation.
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Waseemuddin, Asad, and Kumar Harwalkar Aravind. "Seismic Analysis of Rcc Structure with Different Types of Dampers." International Journal of Innovative Technology and Exploring Engineering (IJITEE) 9, no. 12 (2020): 205–10. https://doi.org/10.35940/ijitee.L7933.1091220.
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In the present Era escalation of multi-storey high rise building is very common because of rapid urbanization in the entire world also innovation in the field of Engineering, science and Technology. Also Engineers have sophisticated designing software. As height of the building increases building response to the wind and seismic load increases. It means that forces and displacement of the structure is directly proportional to the height of the structure. Many research studiesare going on to reduce the structural instability due to high speed winds and earthquakes. During the earthquake the multi-storey high rise structures are failed to resist the seismic loads and it become the catastrophic disaster for human life’s and for the country. It is most important that structure should be able to withstand against external excitation forces. This can be achieved by building structure more flexible.During the time of earthquake multistorey structures are swing and large deformation is occurred and vibrations are transferred in the structure through the ground which causes instability in structure. Thus the use of damper is resists lateral forces (wind load, earthquake load) and providing stability to the structure. Dampers are the mechanical devices which dissipate energy which is facilitate in multi-storey structure to reduce the displacement, buckling of beams and columns and increases the structural stiffness. There is lot of various types of dampers are used in RC multi-storey building. This study deals with performance and selection of suitable type of damper which will be more resistant to earthquake for the selected multi-storey building and different seismic parameters like time period, story stiffness, story displacement, story drift and base shear are checked out. In this study seismic behavior of multi-story RCC building with various types of dampers like fluid viscous damper, friction damper and tuned mass damper is carried out.
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Tang, Wenke, and Eric M. Lui. "Hybrid Recentering Energy Dissipative Device for Seismic Protection." Journal of Structures 2014 (September 23, 2014): 1–17. http://dx.doi.org/10.1155/2014/262409.
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A hybrid recentering energy dissipative device that has both recentering and energy dissipation capabilities is proposed and studied in this paper. The proposed hybrid device, referred to as the hybrid shape memory alloy (SMA) recentering viscous fluid (RCVF) energy dissipation device, connects the apex of a chevron brace to an adjoining beam using two sets of SMA wires arranged in series on either side of the brace and a viscous fluid damper arranged in parallel with the SMA wires. The viscous damper is used because being a velocity-dependent device it does not exert any force that counteracts the recentering force from the SMA wires after the vibration of the frame ceases. In the numerical study, the Wilde’s SMA constitutive model is used to model the SMA wires, and the Maxwell model is used to simulate the viscous fluid damper. To demonstrate the viability and effectiveness of the proposed hybrid device, comparative studies are performed on several single-story shear frames and a series of four-story steel frames. The results show that the frames equipped with the hybrid device have noticeably smaller peak top story displacements and residual story drifts when subjected to ground motions at three different intensity levels.