Journal articles: 'Torsional vibration damper'

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Homik, Wojciech. "The effect of liquid temperature and viscosity on the amplitude-frequency characteristics of a viscotic torsion damper." Polish Maritime Research 19, no. 4 (2012): 71–77. http://dx.doi.org/10.2478/v10012-012-0042-2.

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ABSTRACT The article discusses causes of the appearance of transverse, longitudinal and torsional crankshaft vibrations in multi-cylinder internal combustion engines. Particular attention is paid to the torsional vibration which is the most severe threat to engine crankshafts. Damping methods making use of torsion dampers are presented. With the reference to viscotic dampers, problems with their damping efficiency are discussed in the context of viscosity changes of the damping liquid. The article also presents the amplitude-frequency characteristics of a series of viscotic dampers, which were recorded experimentally on the research rig and on a real object. An idea of vibration damper metric is given.

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Anders, Peter, and Bernhard Schierling. "Torsional vibration damper unit." Journal of the Acoustical Society of America 79, no. 5 (1986): 1642. http://dx.doi.org/10.1121/1.393290.

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Walkowc, Janusz. "Active torsional vibration damper." Journal of the Acoustical Society of America 102, no. 6 (1997): 3248. http://dx.doi.org/10.1121/1.420166.

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Homik, Wojciech, Aleksander Mazurkow, and Paweł Woś. "Application of a Thermo-Hydrodynamic Model of a Viscous Torsional Vibration Damper to Determining Its Operating Temperature in a Steady State." Materials 14, no. 18 (2021): 5234. http://dx.doi.org/10.3390/ma14185234.

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The problem of damping torsional vibrations of the crankshaft of a multi-cylinder engine is very important from the point of view of the durability and operational reliability of the drive unit. Over the years, attempts have been made to eliminate these vibrations and the phenomena accompanying them using various methods. One of the methods that effectively increases the durability and reliability of the drive unit is the use of a torsional vibration damper. The torsional vibration damper is designed and selected individually for a given drive system. A well-selected damper reduces the amplitude of the torsional vibrations of the shaft in the entire operating speed range of the engine. This paper proposes a thermo-hydrodynamic model of a viscous torsional vibration damper that enables the determination of the correct operating temperature range of the damper. The input parameters for the model, in particular the angular velocities of the damper elements as well as the geometric and mass dimensions of the damper were determined on a test stand equipped with a six-cylinder diesel engine equipped with a factory torsional vibration damper. The damper surface operating temperatures used in model verification were measured with a laser pyrometer. The presented comparative analysis of the results obtained numerically (theoretically) and the results obtained experimentally allow us to conclude that the proposed damper model gives an appropriate approximation to reality and can be used in the process of selecting a damper for the drive unit.

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Jagiełowicz-Ryznar, Celina. "The fitting of the viscous dampers to dampen the torsional vibration of the combustion engine’s crank shaft." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (2018): 482–85. http://dx.doi.org/10.24136/atest.2018.117.

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The method of viscous damper fitting, on the base of damping factor of viscous torsion damper, was presented in this paper. The measurements of forced torsional vibration of measuring shaft with damper, on the special test bench are the basis of the method. According to the theoretical formula, including the results of the vibrations measuring, the damping coefficient was determined.

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Dziurdź, Jacek, and Radosław Pakowski. "Analysis of Action Viscous Torsional Vibration Damper of the Crankshaft Based on Transverse Vibration the Engine Block." Solid State Phenomena 236 (July 2015): 145–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.145.

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The article presents an example of research results of the mechanical vibrations of the internal combustion engine with a viscous torsional vibration damper of the crankshaft for different values of the viscosity of silicone oil. A comparison of the crankshaft torsional vibration and the transverse vibration motor body was made. There was proposed the use of the information contained in the transverse vibration signals in order to determine the changes in the technical condition of the viscous damper (changes in viscosity of silicone oil fillingthe damper). Accepting the argument which assumes that there exists the coupling vibration and torsional shaft bent in transverse vibration signals, there should appear symptoms associated with changes in the torsional vibrations. In order to prove this thesis there was conducted active research experiment. Measurements of transients during engine acceleration were made. There was presented the example of the results of measurements of the crankshaft torsional vibrationand the transverse vibration of the motor body.

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Takino, Fumiya, Takahiro Ryu, Takashi Nakae, Kenichiro Matsuzaki, and Risa Ueno. "Fundamental study on countermeasures against subharmonic vibration of order 1/2 in automatic transmissions for cars." MATEC Web of Conferences 211 (2018): 13004. http://dx.doi.org/10.1051/matecconf/201821113004.

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In automatic transmissions for cars, a damper is installed in the lock-up clutch to absorb torsional vibrations caused by combustion in the engine. Although a damper with low stiffness reduces the torsional vibration, low-stiffness springs are difficult to use because of space limitations. To address this problem, dampers have been designed using a piecewise-linear spring having three different stages of stiffness. However, a nonlinear subharmonic vibration of order 1/2 occurs because of the nonlinearity of the piecewise-linear spring in the damper. In this study, we experimentally and analytically examined a countermeasure against the subharmonic vibration by increasing the stages of the piecewise-linear spring using the one-degree-of-freedom system model. We found that the gap between the switching points of the piecewise-linear spring was the key to vibration reduction. The experimental results agreed with results of the numerical analyses.

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Manin, Lionel, Régis Dufour, and Sébastien Schultz. "Pulley torsional vibration damper characterization." Mechanics & Industry 14, no. 2 (2013): 151–55. http://dx.doi.org/10.1051/meca/2013057.

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Homik, Wojciech, and Tadeusz Markowski. "Temperature as a Source of Information about the Technical Condition Viscous Torsion Damper." Solid State Phenomena 236 (July 2015): 78–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.78.

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The problem of damping of torsional vibrations of the crankshaft in a multi-cylinder engine is very important from the point of view of durability and reliability of the drive unit of the vessel or ship. Mostly dependent on the technical state of the torsional vibration damper that is located at the free end of the crankshaft. The paper presents selected results of the research that led to the acceptance criterion for assessing the technical condition of the viscous torsion damper.

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He, Hao Xiang, En Zhen Han, and Yong Wei Lv. "Coupled Vibration Control of Tuned Mass Damper in Both Horizontal and Torsional Direction." Applied Mechanics and Materials 578-579 (July 2014): 1000–1006. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.1000.

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Traditional tuned mass damper (TMD) can reduce the dynamic response of structure under earthquake, but the traditional tuned mass damper is not effective to reduce translation-torsion coupled vibration. A two-directional horizontal and torsional tuned mass damper, which includes tuned mass blocks, torsional blocks and rotation lever, is proposed. The horizontal and torsional response of the building structure is controlled by the movement and the rotation of the multi-dimensional tuned mass damper (MDTMD) in different directions. According to the movement mechanism of the MDTMD, the dynamic equation for the control system considering eccentric torsion effect is established. An eccentric structure with MDTMD is analyzed to verify the control effctive for the horizontal and torsional coupled system under earthquake, and the reduction effect is compared with the traditional TMD. The results show that the coupled response can be reduced effectively by MDTMD and the vibration reduction ration is much higher than traditional TMD.

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Zawisza, Maciej. "Energy Loss and the Choice of Damper of Torsional Vibration Combustion Engines." Solid State Phenomena 236 (July 2015): 188–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.188.

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The crankshaft is exposed to numerous external extortions which generate bending, axial and torsional vibrations. Torsional vibrations are especially dangerous for a safe operation. They are generated by strongly dynamic loads, which come from the combustion processes of fuel-air mixture in cylinders and from the elements of drive system, and engine accessories. Until recently this problem concerned mainly the engines of high power, where dynamic effects generated the vibrations with amplitudes exceeding the limit values, which in effect led to failure of the engine. Crankshafts also significantly increased their torsional elasticity because of the common trend of reducing the engine mass. It resulted in the necessity of using the elements reducing the amplitude of torsional vibrations of the shaft. Rubber torsional vibration dampers are commonly used for this purpose. The author observed that while choosing torsional vibration dampers, the producers concentrated only on the criterion of reducing the amplitude of torsional vibrations below limit values. They forgot that the optimization criterion can be expanded in such a way so that a better effect can be obtained. What is more, safe and economical operation of the engine could be provided.

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Zhang, Zhi Gang. "Experimental Study on Reducing Diesel Engine Noise by Using Torsional Vibration Damper." Applied Mechanics and Materials 321-324 (June 2013): 90–93. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.90.

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The noise of the engine and torsional vibration of the engine’s shafting is been tested. The engine is a direct injection turbo charge inter-cooling four cylinders one. In the testing, the original pulley and three different torsional vibration dampers are compared.The result shows that it can reduce the vibration of the shafting, triangular belt, the accessory, and can reduce 1 to 2 decibel of the engine’s sound power level by using the torsional vibration damper.

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Li, Hua, Hui Liu, and Chang Le Xiang. "Study on the Damping Characteristic of Semi-Active Torsional Damper Based on Combined Positive and Negative Stiffness." Applied Mechanics and Materials 577 (July 2014): 182–86. http://dx.doi.org/10.4028/www.scientific.net/amm.577.182.

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The concept of semi-active torsional vibration damper based on combined positive and negative stiffness is derived and its working principle is discussed. Stiffness expression of parallel mechanism is established, and its elastic properties were analyzed. By establishing nonlinear dynamic model of the proposed damper, its dynamic characteristics are analyzed. The torsional vibration control effect of the proposed damper is better than the traditional dual mass flywheel type torsional vibration damper.

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Shi, Wen Ku, Guang Ming Wu, Shi Da Nie, Shi Chao Wang, and Zhi Yong Chen. "The Influence of Torsional Damper Performance Parameter on Transmission System Torsional Vibration." Applied Mechanics and Materials 241-244 (December 2012): 2015–18. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2015.

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In order to research the influence that the torsional stiffness and damping characteristic of the torsional damper had on the transmission rotational vibration, a multi-degrees-of-freedom model of torsional vibration of a transmission system of an FR type vehicle was built. The frequency of the torsional vibration model of transmission system was calculated, and the forced vibration in the transmission was analyzed; the sensitivity of the torsional stiffness and damping characteristic of the torsional damper on vibration response was researched. This method provides theoretical basis for solving the transmission system rotational vibration of the vehicle, and it has positive meaning in the development of the rear drivetrain NVH.

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Venczel, Márk, and Árpád Veress. "Introduction to Design and Analysis of Torsional Vibration Dampers in Vehicle Industry." International Journal of Engineering and Management Sciences 4, no. 1 (2019): 310–24. http://dx.doi.org/10.21791/ijems.2019.1.39.

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The crankshaft of today’s internal combustion engines with high performance output are exposed to harmful torsional oscillations originated from the unbalanced gas and inertial forces. To avoid the fatigue damage of engine components, caused by the undesired vibrations, torsional vibration dampers can be applied. Viscodampers are one type of the torsional vibration dampers, which operational fluid is silicone oil. For cost-effective R&D activities and production, finite element and finite volume numerical discretization methods based calculation techniques must be involved into the engineering work supported by the modern computer technology. The aim of this paper is to provide an insight into the multidisciplinary design and development process of visco-dampers in vehicle industry applications. Four different examples as structural, fatigue, CFD analyses and structural optimization have been introduced in the present work. It turned out from the static structural and fatigue analyses, that the investigated damper has safety factor over the limit for both static structural and fatigue analyses, so it is suitable for the given load conditions. In the structural optimization process 34.36% mass reduction has been achieved. According to the coupled fluid dynamic and heat transfer simulations a rather stagnating air zone evolved between the engine and the damper during the operation, which can cause efficiency reduction of cooling fins mounted onto the housing. In light of the numerical results, the suitable damper position has been determined for the highest heat transfer.

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He, Haoxiang, Wentao Wang, and Honggang Xu. "Multidimensional Seismic Control by Tuned Mass Damper with Poles and Torsional Pendulums." Shock and Vibration 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/5834760.

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Due to the eccentric characteristics and the torsional excitation of multidimensional earthquakes, the dynamic response of asymmetry structure involves the translation-torsion coupling vibration and it is adverse to structural performance. Although the traditional tuned mass damper (TMD) is effective for decreasing the translational vibration when the structure is subjected to earthquake, its translation-torsion coupled damping capacity is still deficient. In order to simultaneously control the translational responses and the torsional angle of asymmetry structures, a new type of tuned mass damper with tuned mass blocks, orthogonal poles, and torsional pendulums (TMDPP) is proposed. The translation-torsion coupled vibration is tuned by the movement of the mass blocks and the torsional pendulums. According to the composition and the motion mechanism of the TMDPP, the dynamic equation for the total system considering eccentric torsion effect is established. The damping capacity of the TMDPP is verified by the time history analysis of an eccentric structure, and multidimensional earthquake excitations are considered. The damping effect of the traditional TMD and the TMDPP is compared, and the results show that the performance of TMDPP is superior to the traditional TMD. Moreover, the occasional amplitude amplification in TMD control does not appear in the TMDPP control. The main design parameters which affect the damping performance of TMDPP are analyzed.

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Hossein Lavassani, Seyyed Hossein, Hamed Alizadeh, and Peyman Homami. "Optimizing tuned mass damper parameters to mitigate the torsional vibration of a suspension bridge under pulse-type ground motion: A sensitivity analysis." Journal of Vibration and Control 26, no. 11-12 (2019): 1054–67. http://dx.doi.org/10.1177/1077546319891591.

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Suspension bridges are structures that because of their long span and high flexibility can be prone to ambient vibrations such as ground motions. They can experience high amplitude vibrations in torsional mode during an earthquake, where a vibration control strategy seems necessary. Recently, control systems have been widely used to mitigate vibration of structures. Tuned mass damper is a passive control system. Its performance and effectiveness have been verified both theoretically and practically. In this study, a tuned mass damper system is used to mitigate the torsional vibration of a suspension bridge. The Vincent Thomas suspension bridge is selected as a case study, and its response is reduced by a tuned mass damper under ten pulse-type records from 10 major worldwide earthquakes. By using sensitivity analysis, a parametric study is carried out to optimize tuned mass damper parameters, namely, mass ratio, gyration radius, tuning frequency, and damping ratio according to the maximum reduction of the response maxima. Finally, the optimum range of each parameter that can give the best performance and provide both operational and economic justification for the implementation of the project is suggested. The numerical results indicate that the optimized tuned mass damper system can substantially reduce the maximum response and vibration time.

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Karimaei, H., M. Mehrgou, and HR Chamani. "Optimisation of torsional vibration system for a heavy-duty inline six-cylinder diesel engine." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 3 (2019): 642–56. http://dx.doi.org/10.1177/1464419319826744.

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Torsional vibration is one of the major issues and very important calculation for the safe running of heavy-duty diesel engines, specifically crankshaft. Because of different applications of a heavy-duty diesel engine, different driven machine and different attaching systems are inevitable that affect the torsional system. The cranktrain contains the flywheel and torsional damper. The properties of these parts have significant effect on torsional vibration of the system as well as the crankshaft strength. Initial selection of these properties is usually specified based on engine designer experience and also the torsional vibration calculation of the cranktrain. In this paper, the focus is to find the optimum and reliable operating points for the elements in cranktrain using computer-aided engineering (CAE) tools. These are parameters like tuned mass inertia, flywheel inertia, damper stiffness, damper inertia, damper damping, coupling damping and coupling stiffness. The effect of these parameters on system design criteria, especially crankshaft life, was investigated. The results show high sensitivity of crankshaft safety factor to parameters like tuned mass inertia, damper damping coefficient and damper stiffness. Therefore, damper selection is the most important factor to increase the crankshaft life. The new contribution is that the parameters related to the whole cranktrain system that have the greatest effect were obtained and an optimisation was executed on these parameters to fulfil the vibration targets as well crankshaft life.

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TAKAHASHI, Yoshihiro. "Effect of particle damper under torsional vibration." Transactions of the JSME (in Japanese) 85, no. 880 (2019): 19–00248. http://dx.doi.org/10.1299/transjsme.19-00248.

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Ahn, Da-Vin, In-Kyung Shin, Jooseon Oh, et al. "Reduction of Torsional Vibration in Resonance Phenomena for Tractor Power Take-Off Drivelines Using Torsional Damper." Transactions of the ASABE 64, no. 2 (2021): 365–76. http://dx.doi.org/10.13031/trans.13971.

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HighlightsRattling of tractor power take-off drivelines can be detrimental to operators.A novel driveline model, which includes a torsional damper, was constructed.The behavior of the model was validated against that of an actual tractor driveline.The validated model was used to determine the optimal torsional damper parameters.These optimal parameters were validated by laboratory tests.Abstract. Rattle noise and high levels of vibration in agricultural tractors lower the productivity of the operators and may cause serious health issues in them. This study examined a method for preventing resonance and reducing the torsional vibration that causes rattling in tractor power take-off (PTO) drivelines in the idle state using a two-stage torsional damper. The PTO driveline was simplified to a 6-DOF model based on the principle of equivalent mass moment of inertia using commercial simulation software. The variations in the angular velocity of the PTO drive shaft in an actual tractor were measured and compared to the simulation results using a single-stage torsional damper to validate the model. Using this validated PTO driveline model, the pre spring of a two-stage torsional damper was investigated to determine its optimal torsional stiffness to minimize torsional vibration. The simulation results showed that the variations in the angular velocity of the PTO drive shaft decreased as the torsional stiffness of the pre spring decreased; accordingly, an appropriate torsional stiffness reduced the variation in the angular velocity delivered to the PTO drive shaft. The optimal torsional stiffness of the pre spring was determined by considering the manufacturing limitations of the torsional damper and the magnitude of the input engine torque. A pre spring with this optimal torsional stiffness was installed on an actual PTO driveline to measure the angular velocity transmissibility, which was the ratio of the variation in the angular velocity of the engine flywheel to the variation in the angular velocity of the PTO drive shaft, and the results were compared with those of the simulation. When the angular velocity of the engine was 850 rpm, the angular velocity transmissibility of the PTO drive shaft was 0.4 in the actual test, similar to the value of 0.29 obtained using the simulation. Thus, the simulation-optimized pre spring was able to avoid the resonance domain, while considerably reducing the torsional vibration that leads to rattling. The results of this study support the safe operation of agricultural tractors and guide the evaluation of torsional damper configurations of different vehicles. Keywords: PTO driveline, Resonance, Simulation model, Torsional damper, Torsional vibration, Tractor rattle.

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Jee, Jaehoon, Chongmin Kim, and Yanggon Kim. "Design Improvement of a Viscous-Spring Damper for Controlling Torsional Vibration in a Propulsion Shafting System with an Engine Acceleration Problem." Journal of Marine Science and Engineering 8, no. 6 (2020): 428. http://dx.doi.org/10.3390/jmse8060428.

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In order to cope with strengthened marine environmental regulations and to reduce fuel consumption, recently constructed vessels are equipped with an ultra-long stroke engine and apply engine de-rating technology. This was intended to improve propulsion efficiency by adopting a larger diameter propeller turning at a lower speed but also results in a significant increase in the torsional exciting force. Therefore, it is very difficult to control the torsional vibration of its shaft system by adopting a damper, for ships equipped with fuel-efficient ultra-long-stroke engines, even though previously, torsional vibration could be controlled adequately by applying tuning and turning wheels on the engine. In this paper, the vibration characteristics of an ultra-long-stroke engine using the de-rating technology are reviewed and dynamic characteristics of a viscous-spring damper used to control the torsional vibration of its shaft system are also examined. In case of ships have recently experienced an engine acceleration problem in the critical zone, it is proposed that the proper measures for controlling torsional vibration in the propulsion shafting system should include adjusting the design parameters of its damper instead of using the optimum damper designed from theory in order to prevent fatigue fracture of shafts.

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Deuszkiewicz, Piotr, Jarosław Pankiewicz, Jacek Dziurdź, and Maciej Zawisza. "Modeling of Powertrain System Dynamic Behavior with Torsional Vibration Damper." Advanced Materials Research 1036 (October 2014): 586–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.586.

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The paper presents the results of experimental and model research of powertrain system built with torsional vibration damper. The behaviour of powertrain system with and without vibration damper was shown in the conditions of acceleration and deceleration with different increases of rotational speed. Next, authors describe the process of building a mathematical model of such a system and its identification on the basis of experimental results. When examining the results obtained with empirical and model research, it has been shown that in the structural and parametric identification of model of such system, the main factor affecting the right development of the structure should be dynamic criterion, since the only use of static criteria leads to big errors. On the basis of such model we can make some structural solutions to the system to minimize torsional vibrations.

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23

Kim, Jungyun. "Launching Performance Analysis of a Continuously Variable Transmission Vehicle With Different Torsional Couplings." Journal of Mechanical Design 127, no. 2 (2005): 295–301. http://dx.doi.org/10.1115/1.1814387.

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This article describes the launching behaviors of passenger cars equipped with continuously variable transmission (CVT), which have different torsional couplings: a torsion damper and a dual mass flywheel. To reduce the driveline vibration and noise, a torsional coupling is installed in the CVT vehicle, in which the wet type multiplate clutch is used as a start device. In addition, a torsional coupling makes considerable effects on the launching performance of a vehicle. The launching performances, considered here, are the acceleration performance with various throttle positions and the transient characteristics of vehicle creep and throttle tip-in. By using the mathematical models of each driveline component, we developed a simulation program to investigate the launching performance in various launching conditions. In order to verify our simulation program, we performed the road test of a prototype vehicle that has torsion damper as a torsional coupling. Finally, we analyzed and compared the launching performances in two cases of a torsion damper and a dual mass flywheel using the developed simulation program.

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Idehara, Sérgio J., Fernando L. Flach, and Douglas Lemes. "Modeling of nonlinear torsional vibration of the automotive powertrain." Journal of Vibration and Control 24, no. 9 (2016): 1774–86. http://dx.doi.org/10.1177/1077546316668687.

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A vibration model of the powertrain can be used to predict its dynamic behavior when excited by fluctuations in the engine torque and speed. The torsional vibration resulting from torque and speed fluctuations increases the rattle noise in the gearbox and it should be controlled or minimized in order to gain acceptance by clients and manufactures. The fact that the proprieties of the torsional damper integrated into the clutch disc alter the dynamic characteristic of the system is important in the automotive industry for design purposes. In this study, bench test results for the characteristics of a torsional damper for a clutch system (torsional stiffness and friction moment) and powertrain torsional vibration measurements taken in a passenger car were used to verify and calibrate the model. The adjusted model estimates the driveline natural frequency and the time response vibration. The analysis uses order tracking signal processing to isolate the response from the engine excitation (second-order). It is shown that a decrease in the stiffness of the clutch disc torsional damper lowers the natural frequency and an increase in the friction moment reduces the peak amplitude of the gearbox torsional vibration. The formulation and model adjustment showed that a nonlinear model with three degrees of freedom can represent satisfactorily the powertrain dynamics of a front-wheel drive passenger car.

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Wu, Huwei, and Guangqiang Wu. "Driveline Torsional Analysis and Clutch Damper Optimization for Reducing Gear Rattle." Shock and Vibration 2016 (2016): 1–24. http://dx.doi.org/10.1155/2016/8434625.

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This paper describes a research work on driveline modeling, torsional vibration analysis, and clutch damper parameters optimization for reducing transmission gear rattle on the vehicle creeping condition. Firstly, major driveline components, including quasi-transient engine, multistage stiffness clutch damper, detailed manual transmission and differential mechanism, and LuGre tire, are modeled, respectively. Secondly, powertrain system modeling adopting a two-stage stiffness clutch damper is constructed and analyzed. Transient responses predicted by the model show that the driveline undergoes severe torsional vibration and transmission gear rattle phenomenon. By analysis, it is concluded that the clutch damper works jumping between the first- and second-stage stiffness, which results in this problem for the creeping condition. Then, a three-stage stiffness clutch damper is proposed innovatively to solve this problem. It is shown that severe driveline vibration and gear rattle phenomenon are inhibited effectively. Finally, it draws a conclusion that clutch damper parameters could have a great effect on driveline vibration and gear rattle phenomenon and a three-stage stiffness clutch damper could be utilized to solve gear rattle phenomenon efficiently on the vehicle creeping condition.

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Nguyen, Duy-Chinh. "Determination of optimal parameters of the tuned mass damper to reduce the torsional vibration of the shaft by using the principle of minimum kinetic energy." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 2 (2018): 327–35. http://dx.doi.org/10.1177/1464419318804064.

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In this paper, an analytical method is presented to determine the optimal parameters of the symmetric tuned mass damper, such as the ratio between natural frequency of tuned mass damper and shaft (tuning ratio) and the ratio of the viscous coefficient of tuned mass damper (damping ratio). The optimal parameters of tuned mass damper are applied to reduce the torsional vibration of the shaft based on consideration of the vibration duration and stability criterion. The dynamic equations of the shaft are provided via Lagrangian equations, and the optimal parameters of tuned mass damper are derived by using the principle of minimum kinetic energy. Analytical and numerical examples are implemented to verify the reliability of the proposed method. The analytical and numerical results indicate that the optimal parameters of tuned mass damper have significant effects in the torsional vibration reduction of the shaft.

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Chinh, Nguyen Duy. "Optimal parameters of tuned mass dampers for machine shaft using the maximum equivalent viscous resistance method." Journal of Science and Technology in Civil Engineering (STCE) - NUCE 14, no. 1 (2020): 127–35. http://dx.doi.org/10.31814/stce.nuce2020-14(1)-11.

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The paper analyzes and determines the optimal parameters of tuned mass damper to reduce torsional vibration for the machine shaft. The research steps are as follows. First, the optimal parameters of tuned mass damper for the shafts are given by using the maximization of equivalent viscous resistance method. Second, a numerical simulation is performed for configuration of machine shaft to validate the effectiveness of the obtained analytical results. The simulation results indicate that the proposed method significantly increases the effectiveness of torsional vibration reduction. Optimal parameters include the ratio between natural frequency of tuned mass damper and the machine shaft, the ratio of the viscous coefficient of tuned mass damper. The optimal parameters found by numerical method only apply to a machine shaft with specific data. However, the optimal parameters in this paper are found as analytic and explicit to help scientists easily apply to every machine shafts when the input parameters of the machine shaft change. Keywords: tuned mass damper; torsional vibration; optimal parameters; random excitation; equivalent viscous resistance.

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Liebst, Fabian, Sebastian Bindig, and Peter Prystupa. "Grease-filled torsional vibration damper for agricultural powertrains." ATZoffhighway worldwide 10, no. 2 (2017): 18–23. http://dx.doi.org/10.1007/s41321-017-0015-6.

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Sibryaev, Konstantin Olegovich, Maxim Michailovich Gorbachev, and Adel Damirovich Ibadullaev. "DEVELOPING INFORMATION PROCESSING UNIT USED IN SOFTWARE AND HARDWARE COMPLEX MONITORING SHIP SHAFT LINE TORSIONAL VIBRATIONS." Vestnik of Astrakhan State Technical University 2021, no. 1 (2021): 22–28. http://dx.doi.org/10.24143/1812-9498-2021-1-22-28.

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The article considers torsional vibrations in combination with other technical factors, which remain a cause of damages and breakdowns of the ship's propeller shafts, intermediate shafts and crankshafts. Torsional vibrations inevitably occur in the ship plants. It can be explained by the uneven torque of the engine and the torque on the propeller (exposure of the propeller, uneven movement of the water flow, stormy weather, etc.), which leads to alternating twisting of the shaft. To reduce torsional vibrations, dampers are used, which require periodic performance testing by using the torsiography procedure. In contrast to the existing monitoring systems of the technical condition of the damper, it is planned to install an information processing unit for the software and hardware complex for monitoring torsional vibrations of the ship's shaft line and the parameters associated with them (vibration and temperature changes of the flexible elements of the connecting couplings). The unit under development will allow to constantly monitor the level of torsional vibrations and, if they increase, to signal the ship's mechanic to switch to another operational mode of the main engine, which will increase the reliability and automation of the ship power plants, the safety of navigation, and reduce the economic costs of ship operating

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Jagiełowicz-Ryznar, C. "The Impact of Complex Forcing on the Viscous Torsional Vibration Damper’s Work in the Crankshaft of the Rotating Combustion Engine." International Journal of Applied Mechanics and Engineering 21, no. 4 (2016): 1017–23. http://dx.doi.org/10.1515/ijame-2016-0063.

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Abstract The numerical calculations results of torsional vibration of the multi-cylinder crankshaft in the serial combustion engine (MC), including a viscous damper (VD), at complex forcing, were shown. In fact, in the MC case the crankshaft rotation forcings spectrum is the sum of harmonic forcing whose amplitude can be compared with the amplitude of the 1st harmonic. A significant impact, in the engine operational velocity, on the vibration damping process of MC, may be the amplitude of the 2nd harmonic of a forcing moment. The calculations results of MC vibration, depending on the amplitude of the 2nd harmonic of the forcing moment, for the first form of the torsional vibration, were shown. Higher forms of torsional vibrations have no practical significance. The calculations assume the optimum damping coefficient VD, when the simple harmonic forcing is equal to the base critical velocity of the MC crankshaft.

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Singh, Rahul Kumar, Mayank Tiwari, Anpeksh Ambreesh Saksena, and Aman Srivastava. "Analysis of a Compact Squeeze Film Damper with Magneto Rheological Fluid." Defence Science Journal 70, no. 2 (2020): 122–30. http://dx.doi.org/10.14429/dsj.70.12788.

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Rotor systems play vital role in many modern day machinery such as turbines, pumps, aeroengines, gyroscopes, to name a few. Due to unavoidable unbalance in the rotor systems, there are lateral and torsional vibrations. Ignoring these effects may cause the system serious damages, which sometimes lead to catastrophic failures. Vibration level in rotor systems is acceptable within a range. Focus in this work is to minimize the vibration level to the acceptable range. One of the ways vibration level can be minimised is by means of providing damping. To accomplish this task in this work a new concept squeeze film damper is made by electro discharge machining which is compact in configuration, is filled with magneto-rheological (MR) fluid and tested out on one support of a Jeffcott rotor. This compact squeeze film damper (SFD) produces damping in a compact volume of the device compared to a conventional SFD. MR fluid is a smart fluid, for which apparent viscosity changes with the application of external magnetic field. This compact damper with MR fluid provides the variable damping force, controlled by an external magnetic field. In this work, proportional controller has been used for providing the control feedback. This MR damper is seen to reduce vibrations in steady state and transient input to the Jeffcott rotor. Parametric study for important design parameters has been done with the help of the simulation model. These controlled dampers can be used for reducing vibrations under different operating conditions and also crossing critical speed.

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Duan, Yong, and Wenwei Wu. "Tuned viscoelastic damper for hollow shaft's torsional vibration control." Journal of the Acoustical Society of America 131, no. 4 (2012): 3344. http://dx.doi.org/10.1121/1.4708522.

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Xu, Jian Fu, Peng Yu, Tong Zhang, and Rong Guo. "Design of Torsional Vibration Controller for Motor-Gearbox/Differential Drive System of Electric Vehicles." Applied Mechanics and Materials 437 (October 2013): 56–61. http://dx.doi.org/10.4028/www.scientific.net/amm.437.56.

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A torsional controller is proposed for the motor-gearbox/differential drive system of electric vehicles to suppress the torsional vibration of the system. The drive system is simplified to a 2-mass spring damper system, and the state-space equation is set up. A controller consisting of linear quadratic regular (LQR) and state observer is designed. The results of simulation show that LQR can suppress the torsional vibration effectively, enhancing the driving performance of the vehicle.

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KEMUYAMA, HIDEO. "Special issue "Vibration isolation, vibration control and sound isolation". II. Rubber torsional vibration damper." NIPPON GOMU KYOKAISHI 64, no. 5 (1991): 279–86. http://dx.doi.org/10.2324/gomu.64.279.

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Kaplan, Cihangir, Cem Güleç, and Mesut Arıkoğlu. "English Estimating Fatigue of Nr45 Natural Rubber Used in Crank Pulley." ICONTECH INTERNATIONAL JOURNAL 5, no. 3 (2021): 21–30. http://dx.doi.org/10.46291/icontechvol5iss3pp21-30.

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Rubber is used as a vibration damper in many engineering applications, especially in the automotive industry. Rubber is used to dampen torsional vibration in internal combustion engines. Therefore, crank pulleys are used to dampen the crankshaft in a certain frequency range. Rubber durability is very important for the crank pulley to perform its duty for a long time. In this study, the dynamic life of NR45 natural rubber with two different mixtures used in crank pulleys was determined by the prepared test approach. A metal-rubber component structure used in the slip test samples was formed and produced. The metal-rubber component is left to force the rubber in the vertical direction with its natural frequency and specified amplitude to simulate torsional vibration in crank pulleys. A test setup design was carried out to force the metal-rubber component at the determined frequency. In the study, life expectancy estimates based on amplitude and frequency were created on experimental data.

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Nguyen, Duy-Chinh. "Design of the symmetric tuned mass damper for torsional vibration control of the rotating shaft." Noise & Vibration Worldwide 52, no. 7-8 (2021): 212–21. http://dx.doi.org/10.1177/09574565211000416.

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The shaft is one of the most important parts of the machine, and it is used to transmit torque. However, the shaft does not always rotate at constant angular velocity due to sudden acceleration or deceleration or due to unstable current. The rotation of the shaft varies with time, which causes torsional vibration on the rotating shaft. To the best of the author’s knowledge, there is no study on designing a symmetric tuned mass damper (STMD) for the rotating shaft with variable angular velocity. Therefore, the purpose of this study is to design an optimal STMD to reduce torsional vibration for the rotating shaft with variable angular velocity. First, the author designs an optimal STMD for the rotating shaft by the fixed-points theory. Second, the optimal parameters of the STMD are obtained by using the minimum quadratic torque method. The optimal parameters of the STMD are defined in analytic and explicit forms, helping researchers to easily design an optimal STMD when applying to reduce torsional vibration for the rotating shaft. Finally, to evaluate the reliability of the designed optimal STMD, Maple software is used to simulate the vibration of the rotating shaft attached with the optimal STMD, as well as to help the readers to have a visual view on the effect of reducing torsional vibration of the rotating shaft.

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Tang, Xiaolin, Jianwu Zhang, Liang Zou, Haisheng Yu, and Dejiu Zhang. "Study on the torsional vibration of a hybrid electric vehicle powertrain with compound planetary power-split electronic continuous variable transmission." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 17 (2014): 3107–15. http://dx.doi.org/10.1177/0954406214526162.

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A torsional vibration dynamic model is established with the commercial software ADAMS to predict the torsional vibration characteristics of a compound planetary power-split hybrid electric vehicle. By calculating and simulating the built model in ADAMS, the natural frequencies and corresponding modes are obtained. The results agree well with previous work, which derives the conclusions by solution of the system dynamics equations of hybrid driveline. Moreover, the main factors that influence the torsional vibration of the powertrain under the excitation of engine and electric motors are analyzed by the forced vibration analysis. The calculated results show that the low frequencies occur mainly in the torsional vibration of wheels and vehicle, while the high orders are related to the torsional vibration of differential, sun gears and planets. The results also show that the amplitude of torsional vibration of driveline is the lowest when the damping and stiffness of torsional damper are 15 Nms/rad and 618 Nm/rad respectively, the halfshaft stiffness is 2760 Nm/rad and the rotational inertial of engine is 0.42 kgm2. The research can be used to support the further development of the power-split hybrid electric vehicle.

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Wu, Guo Yang, Jun Jie Yang, Cheng Rong Jiang, Yun Song Li, and Guo Yun Li. "Finite Element Analysis on Structure of a New Torsional Vibration Damper." Applied Mechanics and Materials 215-216 (November 2012): 861–66. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.861.

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Based on the practical working state and load conditions of a car, the stress-strain and its strength in static and dynamic state of a new torsional vibration damper were calculated and analyzed with the finite element theory and tools, providing reliable data and a simple and accurate research method of strength for its practical application.Through strength analysis, the maximum equivalent stress of main parts of damper under static load and the stress time curve under dynamic load were obtained. By comparing the analytical results under static and dynamic load, it shows that all parts of the damper meet the strength requirements under the dynamic load, and that the maximum stress value of main parts under idle speed conditions is higher than that of running conditions, which is consistent with the actual working condition; while under the static load, the rivets did not meet the strength requirement. In conclusion, two feasible methods were proposed to improve the strength of rivets. It is verified that this damper can meet working strength requirements at last.

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Wakabayashi, Katsuhiko, Yasuhiro Honda, Tomoaki Kodama, and Kunio Shimoyamada. "Torsional Vibration Damping of Diesel Engine with Rubber Damper Pulley." JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing 38, no. 4 (1995): 670–78. http://dx.doi.org/10.1299/jsmec1993.38.670.

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ISAKA, Naoki, Yoshihiro TAKAHASHI, Masahiko UEKUSA, and Yoshiaki TERUMICHI. "11805 Study on Torsional Vibration with Multi-particle Colliding Damper." Proceedings of Conference of Kanto Branch 2007.13 (2007): 55–56. http://dx.doi.org/10.1299/jsmekanto.2007.13.55.

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Zhao, Bin, and Hui Gao. "Torsional Vibration Control of High-Rise Building with Large Local Space by Using Tuned Mass Damper." Advanced Materials Research 446-449 (January 2012): 3066–71. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.3066.

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According to the shake table test results of a high-rising building with large local space, the dynamic characteristics of such structure are complex and the torsional mode becomes the first mode, while the torsional responses under earthquake excitation, especially of the floor just above the large local space, are very remarkable. Special measures are required for such structural system for maintaining its seismic safety. In this research, the bidirectional Tuned Mass Damper (TMD) is employed for reducing the torsional vibration of the high-rising building with large local space. The optimization of the TMD parameters, such as natural frequency, damping ratios and mass ratio, is performed. The time history analysis results indicate that the proposed bidirectional TMD is very effective in torsional vibration control.

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Brancati, Renato, Ernesto Rocca, and Riccardo Russo. "Gear rattle reduction in an automotive driveline by the adoption of a flywheel with an innovative torsional vibration damper." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 4 (2019): 777–91. http://dx.doi.org/10.1177/1464419319850664.

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An innovative device consisting of a flywheel equipped with a torsional vibration damper, based on the magnetorheological effect in elastomeric spring elements, is proposed in this paper. The feasibility study reports the dynamic behaviour of an automotive driveline equipped with the device aiming to explore the effectiveness of the damper in reducing the torsional oscillations of the flywheel, at low-speed regime, responsible for the vibro-acoustic phenomenon known as “gear rattle”. The spring elements of the device are constituted by magneto-rheological elastomeric samples, interposed between the flywheel and the damper disk, working for shear strains. Their dynamical characteristics can be properly tuned by varying the magnetic field surrounding the springs in order to mitigate the forced vibration causes of gear tooth impacts. The good attitude of the device in mitigating the rattle phenomenon is demonstrated by comparing the results provided by a numerical drive line model, equipped with a “monolithic” flywheel, with those obtained by adopting the present innovative vibration damper. The angular accelerations, resulting from the collisions between the teeth during the operation under “idle” conditions at different angular speeds, are thus compared.

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Zhong, Zai Min, and Qiang Wei. "Modeling and Torsional Vibration Control Based on State Feedback for Electric Vehicle Powertrain." Applied Mechanics and Materials 341-342 (July 2013): 411–17. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.411.

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Electric vehicles will longitudinally vibrate obviously under acceleration and regenerative braking conditions (because of torsional vibration of the electric vehicle powertrain). This paper includes models of motor rotor, gear reducer and differential assembly, half shafts, tire and body and nonlinear powertrain dynamic model in consideration of gear backlash and frictional characteristics between tire and ground. Real car tests confirm that it is correct under acceleration conditions. Then a two mass-spring damper linear model which is simplified from the nonlinear powertrain dynamic model is proposed to design torsional vibration control algorithm based on state feedback. The simulation results show that the algorithm can actively eliminate torsional vibration.

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MAEDA, YUTAKA. "Special issue "Vibration isolation, vibration control and sound isolation". II. Torsional viscous damper." NIPPON GOMU KYOKAISHI 64, no. 5 (1991): 287–94. http://dx.doi.org/10.2324/gomu.64.287.

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Chuan, Fu. "Transforming Method of Torsional Tuned Liquid Column Damper-Eccentric Structure to Torsional Tuned Mass Damper-Eccentric Structure for Vibration Control." Structural Engineering International 31, no. 2 (2021): 295–303. http://dx.doi.org/10.1080/10168664.2020.1756703.

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Abouobaia, Ehab, Rama Bhat, and Ramin Sedaghati. "Development of a new torsional vibration damper incorporating conventional centrifugal pendulum absorber and magnetorheological damper." Journal of Intelligent Material Systems and Structures 27, no. 7 (2015): 980–92. http://dx.doi.org/10.1177/1045389x15590275.

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Chiliński, Bogumil, and Maciej Zawisza. "Analysis of bending and angular vibration of the crankshaft with a torsional vibrations damper." Journal of Vibroengineering 18, no. 8 (2016): 5353–63. http://dx.doi.org/10.21595/jve.2016.17923.

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Chen, Xi, Fu You Xu, Wen Liang Qiu, and Zhe Zhang. "AMD Application for Suppressing the Lateral and Torsion Buffeting Response of Suspension Pipeline Bridge." Advanced Materials Research 163-167 (December 2010): 4114–19. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4114.

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Active Mass Damper has been proven to be efficient in suppressing structure vibration. Previous studies of AMD have been concentrated on the vibration control of buildings under earthquake excitation, whereas few investigation of wind-induced bridge vibration control has been conducted. In consideration of the characteristics of one suspension pipeline bridge which behaves dramatic lateral and torsional response under fluctuating wind action, a two-DOFs TMD/AMD system for suppressing both lateral and torsional responses was proposed. The bridge is modeled using Ansys and the buffeting responses of the bridge under TMD, AMD control are respectively simulated and analyzed by MATLAB/Simulink. The efficiency of different control system has been studied. The results show that two-DOFs AMD system has a better performance in suppressing the buffeting response of lateral bending and torsion. In addition, AMD system can be applicable to a wider range of frequency and therefore manifests the more stable performance than TMD under fluctuating wind loads which contain various frequency components.

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Lee, D. H., T. Y. Chung, Y. C. Kim, and H. S. Kim. "Design and Performance Evaluation of Spring-viscous Damper for Torsional Vibration." Transactions of the Korean Society for Noise and Vibration Engineering 21, no. 12 (2011): 1192–98. http://dx.doi.org/10.5050/ksnve.2011.21.12.1192.

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Yucesan, Yigit A., Felipe A. C. Viana, Lionel Manin, and Jarir Mahfoud. "Adjusting a torsional vibration damper model with physics-informed neural networks." Mechanical Systems and Signal Processing 154 (June 2021): 107552. http://dx.doi.org/10.1016/j.ymssp.2020.107552.

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Journal articles on the topic 'Torsional vibration damper'

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