Journal articles: 'Vibration isolation and damping'

1

Zhanlong, Li, Sun Dagang, Qin Yuan, Zhang Wenjun, and Sun Bao. "Stiffness-Damping Matching Modelling for Vibration Isolation System of Roadheader ECB." International Journal of Acoustics and Vibration 25, no. 1 (March 30, 2020): 54–61. http://dx.doi.org/10.20855/ijav.2020.25.11514.

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The electronic control box (ECB) is a key and precise component of a roadheader. The vibration of the ECB is an increasingly prominent issue as the machine capacity grows. In order to promote the isolation effect of the ECB, a whole-body vibration model considering the cutting effect is derived, based upon which the stiffness-damping matching strategy for the ECB isolator is acquired. For engineering application, the tubular constrained damping isolator (TCDI) is developed based on the constrained damping theory and the matching strategy. The theoretical results show that the isolation effect of the ECB isolator strengthens as the stiffness coefficients decline and the damping coefficients increase. The configurations with larger rear stiffness coefficients and larger front damping coefficients could lead to a better vibration control effect. The experiment results indicate that the TCDI exhibits a greater capability of isolating the impact excitation than the traditional E-type isolator, thus verifying the whole-body vibration model for the roadheader and the matching strategy for the ECB isolator. This research can provide theoretical and practical references for the investigation of the dynamic behaviour of complex viscoelastic structures.

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Lei, Xiaofei, Chengjun Wu, and Hengliang Wu. "A novel composite vibration control method using double-decked floating raft isolation system and particle damper." Journal of Vibration and Control 24, no. 19 (August 28, 2017): 4407–18. http://dx.doi.org/10.1177/1077546317724967.

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This paper presents a composite vibration control method that uses a double-decked floating raft isolation system and particle dampers to control the severe vibration of a heavy compressor set. In view of the structural characteristics of the compressor set, a mechanical impedance method is employed to investigate the acceleration transfer ratios of the double-decked floating raft isolation system, and to design three isolating schemes. Numerical results indicate that the particle damping technology does not disturb the isolating performance of the double-decked floating raft isolation system while reducing only its acceleration amplitude. To improve the damping performance of particle dampers, an anti-resonance method and a co-simulation technique are used to optimize the installation location of the particle dampers, as the damping effect is related to the vibrating velocity at the damper’s position. Furthermore, two types of particle damper—cylindrical and cuboid—are designed, based on conclusions drawn from experiments using the anti-resonance method. The damping effectiveness of the particle damper scheme is also examined using the co-simulation technique; results indicate that the proposed installation scheme can effectively suppress the vibration of the compressor rack. In addition, the presented schemes using the composite vibration control method are verified and compared in on-site experiments, and results demonstrate that the third isolating scheme presented, combined with particle damping technology, is best in controlling vibration of the compressor set.

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Mofidian, S. M. Mahdi, and Hamzeh Bardaweel. "Displacement transmissibility evaluation of vibration isolation system employing nonlinear-damping and nonlinear-stiffness elements." Journal of Vibration and Control 24, no. 18 (July 27, 2017): 4247–59. http://dx.doi.org/10.1177/1077546317722702.

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Undesired oscillations commonly encountered in engineering practice can be harmful to structures and machinery. Vibration isolation systems are used to attenuate undesired oscillations. Recently, there has been growing interest in nonlinear approaches towards vibration isolation systems design. This work is focused on investigating the effect of nonlinear cubic viscous damping in a vibration isolation system consisting of a magnetic spring with a positive nonlinear stiffness, and a mechanical oblique spring with geometric nonlinear negative stiffness. Dynamic model of the vibration isolation system is obtained and the harmonic balance method (HBM) is used to solve the governing dynamic equation. Additionally, fourth order Runge–Kutta numerical simulation is used to obtain displacement transmissibility of the system under investigation. Results obtained from numerical simulation are in good agreement with those obtained using HBM. Results show that introducing nonlinear damping improves the performance of the vibration isolation system. Nonlinear damping purposefully introduced into the described vibration isolation system appears to eliminate undesired frequency jump phenomena traditionally encountered in quasi-zero-stiffness vibration isolation systems. Compared to its rival linear vibration isolation system, the described nonlinear system transmits less vibrations around resonant peak. At lower frequencies, both nonlinear and linear isolation systems show comparable transmissibility characteristics.

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Meng, Qingguo, Xuefeng Yang, Wei Li, En Lu, and Lianchao Sheng. "Research and Analysis of Quasi-Zero-Stiffness Isolator with Geometric Nonlinear Damping." Shock and Vibration 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/6719054.

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This paper presents a novel quasi-zero-stiffness (QZS) isolator designed by combining a tension spring with a vertical linear spring. In order to improve the performance of low-frequency vibration isolation, geometric nonlinear damping is proposed and applied to a quasi-zero-stiffness (QZS) vibration isolator. Through the study of static characteristics first, the relationship between force displacement and stiffness displacement of the vibration isolation mechanism is established; it is concluded that the parameters of the mechanism have the characteristics of quasi-zero stiffness at the equilibrium position. The solutions of the QZS system are obtained based on the harmonic balance method (HBM). Then, the force transmissibility of the QZS vibration isolator is analyzed. And the results indicate that increasing the nonlinear damping can effectively suppress the transmissibility compared with the nonlinear damping system. Finally, this system is innovative for low-frequency vibration isolation of rehabilitation robots and other applications.

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Smirnov, Vladimir, and Vladimir Mondrus. "Probability Analysis of Precision Equipment Vibration Isolation System." Applied Mechanics and Materials 467 (December 2013): 410–15. http://dx.doi.org/10.4028/www.scientific.net/amm.467.410.

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The article deals with probability analysis for a vibration isolation system of sensitive equipment. Vibration isolation system is subjected to external base vibrations due to ambient oscillations (background noise). Considering Gauss distribution for ambient vibrations, we estimate the probability when the relative displacement of isolated mass will still be lower than the vibration criteria. The problem is solved in three-dimensional space, evolved by the system parameters damping and natural frequency. According to this probability distribution, the chance of exceeding vibration criteria for a vibration isolation system is evaluated and different vibration isolation systems are compared.

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Ren, Yafeng, Shan Chang, Geng Liu, Liyan Wu, and Haiwei Wang. "Vibratory Power Flow Analysis of a Gear-Housing-Foundation Coupled System." Shock and Vibration 2018 (June 28, 2018): 1–13. http://dx.doi.org/10.1155/2018/5974759.

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The marine gearbox is usually installed on a vibration isolation system in order to reduce oscillation transmitted to the ship foundation. However, researches on vibration transmission in the gear-housing system and isolation system are currently independent. With the increasing requirement of lower vibration, a coupled model needs to be built to control the vibration propagation from a view of the whole system. Considering the mesh transmission error excitation of a gear pair, a flexible gear-housing-foundation coupled impedance model is constructed in this paper, and the vibratory power flow of the whole system is calculated. Power transmissions between three different gearbox installation configurations, that is, rigid installation, single-stage isolation, and double-stage isolation, are compared. Taking the single-stage isolation configuration as an example, parameter influences on the vibration of the foundation are studied. Results show that double-stage isolation can achieve lower vibration than single-stage isolation; decrease in bearing stiffness or Young’s modulus of isolator will yield better vibration isolation performance; housing damping and isolator damping are beneficial to vibration reduction.

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Jurevicius, M., V. Vekteris, V. Turla, A. Kilikevicius, and G. Viselga. "Investigation of the dynamic efficiency of complex passive low-frequency vibration isolation systems." Journal of Low Frequency Noise, Vibration and Active Control 38, no. 2 (January 3, 2019): 608–14. http://dx.doi.org/10.1177/1461348418822230.

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In this study, the theoretical and experimental investigations of the dynamics of complex passive low-frequency vibration systems are described. It is shown that a complex system consisting of a vibrating platform, an optical table and a vibration isolation system of quasi-zero stiffness loaded by a certain mass may isolate low-frequency vibrations in a narrow frequency range only. In another case, the system does not isolate vibrations; it even operates as an amplifier. The frequencies that ensure the top efficiency of the vibration damping system of quasi-zero stiffness were established.

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Zheng, Hui Ming, Lu Hua Zhu, and Dong Dong Dong. "Vibration Control of Magnetorheological Nanocomposites Isolator." Applied Mechanics and Materials 552 (June 2014): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.552.216.

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A novel tunable stiffness and damping vibration isolator based on magnetorheological nanocomposites filled with carbon nanotubes (CNMRE) was proposed. The stiffness and damping is controlled by the current applied to the magnetic excitation coil. Under the combined ON–OFF control law, the proposed vibration isolator shows satisfying isolation effect. The simulation results indicate that, in comparison to MRE isolator with ON–OFF stiffness and damping control, CNMRE isolator with ON–OFF control not only has high stiffness and damping capacity, corrosion resistance, and high failure strength which are demanded in industries, but also significantly suppresses vibration under sinusoid excitation, random excitation, and pulse excitation. The proposed vibration isolator is very simple and easy to be applied in practical system.

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9

Li, Xin, Jinqiu Zhang, and Jun Yao. "Effect of the Time-Varying Damping on the Vibration Isolation of a Quasi-Zero-Stiffness Vibration Isolator." Shock and Vibration 2020 (May 8, 2020): 1–10. http://dx.doi.org/10.1155/2020/4373828.

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This study focuses on the effect of damping changes on the vibration isolation of a quasi-zero-stiffness vibration isolator. A nonlinear-vibration equation for the quasi-zero-stiffness vibration isolator is found and solved using the multiscale method. Then, the vibration characteristics before, in the process of and after the damping change, are also examined. The results show that time-varying damping can be equivalent to the addition of a stiffness term to the vibration system, which leads to a change of the vibration amplitude frequency response, leakage of power spectrum, and corresponding linear spectrum features being weakened. When the damping changes rapidly, the vibration system tends to be divergent rather than stable. After the change, the number of stable focuses of the proposed quasi-zero-stiffness vibration isolator increases from one to two, and the system will see decline in its vibration stability.

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10

Petrakov, E. V. "OPTIMAL TRANSVERSE VIBRATIONS DAMPING OF A CONSOLE BEAM." Problems of strenght and plasticity 81, no. 1 (2019): 94–102. http://dx.doi.org/10.32326/1814-9146-2019-81-1-94-102.

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The multicriteria problem of transverse vibrations damping of a console beam is colved by the active and passive damping methods. The mathematical model of beam is provided by Bernoulli-Euler's hypotheses with the linear viscosity. Perturbation acting on the beam belongs to a class L2 of functions. The beam mode is described by Krylov functions. The normal form method is used to convert to the main coordinates. A model of active vibration isolation applied along the entire length of the console beam and a model connected to a vertical base at one point were constructed. The task of transverse vibrations damping is a state feedback control problem with two controlled outputs. Two criteria are introduced: the level of the control force and the maximum deflection of the beam. The generalized H2-norm is used as a measure of functional evaluation in the synthesis of optimal regulators. The search for optimal feedback is based on the use of linear matrix inequalities and efficient algorithms for solving, implemented in the MATLAB package. Synthesis of Pareto optimal control is implemented on the basis of Germeyer convolution. The optimal values of the functional under distributed and concentrated vibration isolations are given with respect to two criteria for active and passive damping methods. The paper includes a comparison of vibration isolation for different damping methods.

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11

Nashif, Ahid. "Vibration damping laminate with vibration isolation cut therein." Journal of the Acoustical Society of America 115, no. 3 (2004): 956. http://dx.doi.org/10.1121/1.1697762.

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Gao, M., S. P. Tian, R. He, Y. Wang, and Q. S. Chen. "Numerical Analysis on the Ground Vibration Isolation of Duxseal." Advances in Civil Engineering 2019 (December 24, 2019): 1–10. http://dx.doi.org/10.1155/2019/6507465.

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A new kind of vibration screening material, Duxseal, with a high damping ratio is proposed to be used as an active vibration barrier in the free field. To investigate the influence of width, thickness, and embedded depth of using Duxseal on vibration reduction, numerical studies are performed using a three-dimensional (3D) semianalytical boundary element method (BEM) combined with a thin-layer method (TLM). The isolation effectiveness of Duxseal in ground vibration is also compared with the traditional wave impeding block (WIB). The numerical results show that Duxseal performed exceedingly well in screening ground vibrations in the free field. The effectiveness of the vibration isolation increases with the increase in the width, thickness, and embedded depth of the Duxseal material, within a certain range, under harmonic vertical excitation. In addition, Duxseal is much more effective for isolating ground vibration than the traditional WIB. The performance of Duxseal in isolating ground vibration is relatively stable along the distance away from the vibration source, while the amplitude attenuation ratio bounces upward when the distance away from the vibration source increases for the WIB isolation system.

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13

Sun, Zi Qiang, Chang Zheng Chen, and Huang Liu. "Vibration Reduction of Water Source Heat Pump Units Based on Particle Damping Materials." Advanced Materials Research 532-533 (June 2012): 220–23. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.220.

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Spring vibration isolators and rubber damping vibration isolators are often used in active isolation engineering of water source heat pump units. The method is inefficient in shock and low frequency vibration isolation. Because the stiffness of equipments reduces with the isolation system the vibration severity itself becomes too big for working safely. Particle damping materials can absorb vibration energy to reduce vibration. The paper testifies that successful application of particle damping materials in vibration reduction of water source heat pump units is a practical simple way with low cost.

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Li, Jie, Rui Ping Tao, Jun Liu, and Wei Chen. "Dynamic Research and Design on SINS Damping System in Vehicle." Advanced Materials Research 328-330 (September 2011): 1679–83. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1679.

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For the vibration noise problem of strap-down inertial navigation system in the vehicle, a better vibration damping system was designed. Based on the vibration characters of the vehicle environment, a vibration damping model fitted the SINS in the vehicle was presented; and then the mechanism of vibration damping system was designed especially; and then the design of vibration damping system was verified by using of the dynamic characteristic analysis, On the basis of the above analysis, the overall structure of actual vibration isolation system was built, and then the test for the vibration isolation system was made, the results show that the micro-isolation system for the SINS system vibration and noise has a better inhibition effect, and the applicability and the dependability of the vibration damping system is verified by the test results, which provides reference basis for the design of the strap-down inertial navigation damping system in the land vehicle and provides techniques for the better application of SINS in other fields.

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15

Ferri, A. A. "Friction Damping and Isolation Systems." Journal of Mechanical Design 117, B (June 1, 1995): 196–206. http://dx.doi.org/10.1115/1.2836456.

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This paper surveys the literature on the use of dry friction in passive damping and vibration isolation. Several analytical techniques are presented followed by applications from various areas. Despite difficulties in the analytical and experimental treatment of friction damped systems, numerous studies have endeavored to predict, measure, and/or enhance the energy dissipation and vibration isolation properties of dry friction in order to improve system performance. Undoubtedly, friction damping will continue to play an important role in many mechanical and structural systems.

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Ferri, A. A. "Friction Damping and Isolation Systems." Journal of Vibration and Acoustics 117, B (June 1, 1995): 196–206. http://dx.doi.org/10.1115/1.2838663.

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This paper surveys the literature on the use of dry friction in passive damping and vibration isolation. Several analytical techniques are presented followed by applications from various areas. Despite difficulties in the analytical and experimental treatment of friction damped systems, numerous studies have endeavored to predict, measure, and/or enhance the energy dissipation and vibration isolation properties of dry friction in order to improve system performance. Undoubtedly, friction damping will continue to play an important role in many mechanical and structural systems.

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Kong, Xiang Jun, and Chong Zheng Chen. "Experimental Investigation on Damping Characteristics in Pump-Sand Box-Isolation System." Advanced Materials Research 1051 (October 2014): 906–9. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.906.

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Sand is used in the pump-sand box-isolation system, studying the initial displacement, particle size and packing rate how to affect the damping ratio by free vibration experiments. The result shows that the initial displacement of the system has less effect on damping ratio, the particle packing rate is a significant influence factor of damping ratio, selecting the appropriate particle packing rate can get the maximum damping ratio, reducing the particle size can increase the system damping ratio, but the damping ratio no longer obviously changes when the particle size of is less than 1.5mm. In general, the packing rate needs to be controlled at below 70% in metal spring or rubber isolator system. This result can provide the basis for the design of particle damping vibration isolation system.

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18

Tu, Y. Q., and G. T. Zheng. "On the Vibration Isolation of Flexible Structures." Journal of Applied Mechanics 74, no. 3 (March 28, 2006): 415–20. http://dx.doi.org/10.1115/1.2201882.

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Although the study of vibration isolation has a very long history, when an isolated structure is so flexible that it cannot be properly approximated with a rigid body or a single-degree-of-freedom model, its vibration isolation brings about some new questions and problems. By transforming the dynamic equation of motion of the coupled structure formed by the isolator and the isolated structure into the modal space and following the tradition of studying features of the vibration transmissibility across the isolator, questions and problems associated with the flexible structure vibration isolation are studied. It is found from the study that a lower isolation frequency and a higher damping level can both increase the isolation effectiveness, the isolated structure is a vibration absorber to the isolator, and a combination of the vibration isolation and the vibration attenuation can be more effective in mitigating the vibration. A numerical example of the whole spacecraft vibration isolation has proved the above conclusions.

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Oh, Hyun-Ung, Shigemune Taniwaki, Naofumi Kinjyo, and Katsuhiko Izawa. "Flywheel vibration isolation test using a variable-damping isolator." Smart Materials and Structures 15, no. 2 (January 30, 2006): 365–70. http://dx.doi.org/10.1088/0964-1726/15/2/017.

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Yingli, Li, and Xu Daolin. "Force transmissibility of floating raft systems with quasi-zero-stiffness isolators." Journal of Vibration and Control 24, no. 16 (May 17, 2017): 3608–16. http://dx.doi.org/10.1177/1077546317708460.

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In view of the excellent performance of a single quasi-zero-stiffness (QZS) device in vibration attenuation, this paper presents a study on a vibration isolation floating raft system constructed with a double-layer QZS mechanism. A QZS device is a typical nonlinear isolator, hence the floating raft system is a coupled highly nonlinear isolation system. To understand the behaviors and its performance in vibration attenuation, an analytical approach is developed to describe the characteristics including the mathematical relationship between amplitude–frequency, force transmissibility, and the effects of the mass ratio and damping ratios on attenuation performance. The outcomes show that the two-degree-of-freedom QZS–QZS system is superior for vibration isolation when compared to the traditional linear system and the two other types of QZS systems. The effective vibration isolation frequency region of the QZS–QZS system is expanded to the low-frequency region by 72%. The QZS system is sensitive to the damping ratio, which decreases the resonance peak significantly. The mass ratio is a crucial design parameter in low-frequency vibration isolation design.

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Huang, De Dong, and Bin Wu. "Design of Vibration Isolation System for Laser Strapdown IMU." Applied Mechanics and Materials 109 (October 2011): 390–94. http://dx.doi.org/10.4028/www.scientific.net/amm.109.390.

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The circular probable error is a little larger in the ground dynamic navigation test of the laser gyroscope Strap down inertial navigation system, so a better vibration damping system needs to be designed for SINS with laser gyro. Through analysis for the model of the vibration and the old vibration damping system, a new system of the double free degree be bring forwarded to reduce the response of random vibration on inertial navigation system. During the design, considering the installing plate is part of the vibration damping system and reckoning the inner space of the tactical missile carefully , using the finite element dynamic optimization method, a satisfactory installing plate and a damper with better dynamic characteristics is designed, then through ground vibration experiment and the designed of repetition parameter optimization, now the new vibration damping system can work effectively and the effect of vibration absorbing has achieved the requirement, it can be applied to the aircraft.

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Wu, Shi Jie, Lin He, and Xi Zhi Zhao. "Analysis of Frequency and Damping Ratio on the Shock Isolation Efficiency." Advanced Materials Research 791-793 (September 2013): 835–38. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.835.

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The traditional shock isolation system is only designed in stiffness regardless of damping, which causes acute contradiction between absolute acceleration amplitude and relative displacement amplitude. Based on the single degree of freedom negative shock isolation system, numerical analysis demonstrates that relative little amplitude of absolute acceleration and relative displacement could be attained within a certain range of damping and frequency ratio. Selecting appropriate damping and stiffness of vibration isolator can resolve contradiction between absolute acceleration amplitude and relative displacement amplitude and consequently improve shock isolation efficiency.

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MOMOZAWA, MASAYUKI. "Special issue "Vibration isolation, vibration control and sound isolation". II. On paint for vibration damping." NIPPON GOMU KYOKAISHI 64, no. 5 (1991): 326–35. http://dx.doi.org/10.2324/gomu.64.326.

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Liu, Yong, and Li Hua Wen. "Vibration Isolation with Semi-Active Friction Damping." Advanced Materials Research 199-200 (February 2011): 1041–45. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1041.

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This study explores the effect of semi-active friction damping on vibration isolation systems by means of numerical simulation. Since the Lugre friction model can describe many phenomena observed in laboratories, it is chosen to provide accurate friction force model for the analysis and simulations. The drawback of the passive friction damping system is that it decreases the resonance response at the cost of worsening the performance for high frequencies. A semi-active control method (skyhook method) is used to tune the normal force so that the energy dissipated by the friction force is maximized. Such semi-active friction damping system is simple but efficient, and it can achieve result almost as good as that of active systems. Results from numerical simulations show that compared with passive system, semi-active control method decreases the response significantly for both low and high frequencies, with harmonic and random excitations.

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Diez-Jimenez, Efren, Toshihiko Sugiura, Rocco Rizzo, Maria-Jesus Gómez-García, and Andrew Fleming. "Electromagnetic Techniques for Vibration Damping and Isolation." Shock and Vibration 2019 (November 26, 2019): 1–2. http://dx.doi.org/10.1155/2019/9139067.

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Wang, Zhong, Chang Zheng Chen, and Xiang Jun Kong. "Study on Damping Measures of Pump Piping Vibration Isolation Device." Advanced Materials Research 971-973 (June 2014): 744–47. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.744.

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The problem about pump piping system vibration isolation that is hard to be solved at the present stage in the practice engineering was studied in this paper. Damping measures which is the necessary measure is proposed in this study. Theoretical analysis is given to the main parameter (thickness) of the influences of the damping. Based on the free damping measure, constrained damping measures was proposed and verified by the experiments. The results show that the damping effect was improved with the increasing of the thickness. Under the same conditions, the effect of the constrained damping measures was better than the free damping measures. The results have significant guidance in the isolation vibration of the pump system.

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Wei, Zhan Ji, Dong Xu Li, and Rui Xu. "Vibration Isolation Research on the Metal Rubber Damping Rod of Payload Attach Fitting." Advanced Materials Research 391-392 (December 2011): 467–73. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.467.

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In order to reduce the vibration load transmitted from the launch vehicle to the spacecraft during the launching stage, a whole-spacecraft vibration isolating method is advanced by modifying ordinary payload attach fitting (PAF). The core component of the PAF is a kind of damping rod produced by composite material encapsulating metal rubber (MR). In this paper, nonlinear equivalent damping model of the damping rod is built up. By using the model, the stiffness, damping and the transmissibility of the damping rod is studied attentively. Simulation results demonstrate that there exist nonlinear relationships between vibration parameters and the stiffness and damping characteristics of the damping rod. The damping rod can isolate high-frequency vibration as well as restrain the resonant peak effectively.

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Deastra, Predaricka, Jati Sunaryati, and Riza Aryanti. "THE IMPACT OF APPLYING BASE ISOLATOR IN HOSPITAL BUILDING." Jurnal Rekayasa Sipil (JRS-Unand) 10, no. 2 (October 15, 2014): 9. http://dx.doi.org/10.25077/jrs.10.2.9-24.2014.

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Due to Indonesia’s location in the earthquake zone, it is necessary for civil engineers in Indonesia to study seismic performance of a building, which is strongly related to the structure of the building itself. Buildings equipped with vibration damping structures, known as an isolation system, will have a different seismic behavior than if it did not have one. This is due to the impact of an earthquake dampening vibration isolator. This final project analyzes the difference between seismic performance of a building using a seismic isolation system and ones without. The conclusion of this final project shows that the isolation system will decrease the internal force of a structure element by about 57.71% for axial force, 84.10% for shear, and 85.75% for moment. The application of an isolation system will also decrease the relative displacement by about 74,28% and extended structure vibration period by about 171.17 %. Keywords: earthquake, seismic performance, isolation system.

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Yang, Xiao Lan, Ji Feng Liu, Bing Zhi Kong, Xiao Lin Jia, Xiao Feng Yang, and Biao Huang. "Vibration Isolation Analysis of Vibrating Screen with Two-Mass and High Energy." Applied Mechanics and Materials 427-429 (September 2013): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.112.

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To break through the drawbacks of the one-mass vibrating screen like plugging screen, high noise and etc., a new vibration screen with two-mass and high energy which could generate transient high vibration intensity was analyzed. To meet the requirements of energy-saving and system stability, a spring with nonlinear and hard features was used in the main vibration system. In this case, the springs stiffness could change along with the vibration intensity. The stiffness of the vibration isolation spring could be determined by analyzing the vibration isolation coefficient, and then the hollow cylindrical rubber spring with internal damping was adopted in the vibration isolation system. On the one hand, this vibration isolation spring could effectively absorb transient high vibration intensity which passed from main vibrating spring to the lower mass. On the other hand, it could achieve good effect of vibration isolation between the lower mass and the foundation. Base on field testing, the vibration intensity was increased by 28%, meanwhile, the noise was reduced by 4% and the impact vibration to foundation was reduced by 24% , which successfully solved the plugging screen problem and also verified the validity of the vibration isolation system.

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Luo, Yu Feng, Yuan Shan Li, and Xu Chen. "Analysis of Multiple Degrees of Freedom Vibration Isolation System Using the State Space Method." Advanced Materials Research 338 (September 2011): 431–35. http://dx.doi.org/10.4028/www.scientific.net/amr.338.431.

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This papers deals with fast solving method of natural frequency and vibration isolation coefficient of multiple degrees of freedom vibration isolation system. In the foundation of a mathematical model of vibration motion differential equation, a new state space method is derived and presented. Through transforming the vibration isolation differential equations into the state space equations, it is convenient to facilitate the solution of vibration isolation coefficient of vibration isolation system of multiple degrees of freedom with damping, by using the state space method and the MATLAB/Simulink module. Simulation results showed the result is consistent with the theory result. Simulation results also showed that with the help of damping, the maximal vibration isolation coefficient of x direction is lowered from 90 to 3.2 in the 5.31Hz, which eliminate the resonance phenomenon. In y and z direction, the maximal vibration isolation coefficient is also decreased from 78 to 2.4 and from 210 to 2.35. The state space method can find further applications on the selection of vibration isolation system and the evaluation of vibration isolation efficiency.

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Rogacheva, Nelly. "Active vibration suppression of a beam using piezoeffect." E3S Web of Conferences 97 (2019): 03024. http://dx.doi.org/10.1051/e3sconf/20199703024.

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Operation of structures and equipment in dynamic conditions led to the problems of vibration isolation and vibration suppression. For vibration isolation and vibration suppression passive, active systems and their combinations are used. Passive vibration isolation usually consists in the fact that the protected object relies on extremely dimensional springs and vibration isolators. Vibration isolation systems containing only passive elastic and damping elements are called passive. Active vibration isolation and vibration damping systems use external energy sources. These are pneumatic, hydropneumatic and hydromechanical devices. Recently, electro-elastic and magneto-elastic systems [1], [2] began to be used for vibration isolation and active vibration suppression. As a rule, the analysis of the work of such systems consists in the development of an experimental layout and a schematic diagram. In this paper, a mathematically based model is used to solve the problem in question. The calculations are performed and the results are presented in the form of graphs.

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Jiang, Bo. "The Research of Damping Adjustable Isolators Control Method." Advanced Materials Research 774-776 (September 2013): 44–47. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.44.

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The mechanical model of the electro-rheological fluid damping adjustable isolator is established. Then the two degree of freedom vibration adjusting system of engine and car frame is built. The PD fuzzy control method is used to control the damping characteristic of the damping adjustable isolator. Simulation analysis is executed by using Matlab software. The datum of simulation analysis indicates that the isolation capability of the PD fuzzy control electro-rheological fluid damping adjustable isolator is well.

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Peicheng, Shi, Shi Peilei, Nie Gaofa, Tang Ye, and Pan Daoyuan. "Research on Displacement Transfer Characteristics of a New Vibration-Isolating Platform Based on Parallel Mechanism." Mathematical Problems in Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8743868.

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Based on the parallel mechanism theory, a new vibration-isolating platform is designed and its kinetic equation is deduced. Taylor expansion is used to approximately replace the elastic restoring force expression of vibration-isolating platform, and the error analysis is carried out. The dynamic-displacement equation of the vibration-isolating platform is studied by using the Duffing equation with only the nonlinear term. The dynamic characteristics of the vibration-isolating platform are studied, including amplitude-frequency response, jumping-up and jumping-down frequency, and displacement transfer rate under base excitation. The results show that the lower the excitation amplitude, the lower the initial vibration isolation frequency of the system. The influence of the platform damping ratio ζ on displacement transfer rate is directly related to the jumping-down frequency Ωd and the external excitation frequency. The vibration-isolating platform is ideally suited for high-frequency and small-amplitude vibrations.

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Cronjé, Johan M., P. Stephan Heyns, Nico J. Theron, and Philip W. Loveday. "Development of a Variable Stiffness and Damping Tunable Vibration Isolator." Journal of Vibration and Control 11, no. 3 (March 2005): 381–96. http://dx.doi.org/10.1177/1077546305048585.

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In this paper we report on the development of a variable stiffness and damping Liquid Inertia Vibration Eliminator (LIVE) vibration isolator. The result is the ability to shift the isolation frequency of the isolator and also to change the amplification at resonance. A practical variable stiffness spring was developed by using a compound leaf spring with circular spring elements. A wax actuator, controlled by a hot-air gun with a closed-loop displacement and velocity feedback control system, was used to separate the springs at the center. An experimental isolator was constructed and tested. The isolation frequency was shifted from 22.8 to 36.2 Hz by changing the stiffness of the spring by 270%. A transmissibility of less than 10% was achieved over the whole range. The viscous damping ratio was changed from 0.001 to 0.033 by increasing the flow losses in the system.

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Rong, Q., Yan Sheng, and Shi Xin Liu. "Vertical Vibration Control of Series Isolation System under Near-Fault Earthquake." Applied Mechanics and Materials 638-640 (September 2014): 1952–55. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1952.

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Series isolation system consists of rubber isolation bearings and composite disk springs, determination method of vertical stiffness and vertical damping of isolation layer is given. Entering the near-fault vertical seismic waves, the affect of isolation layer parameters and earthquake intensity on the isolation effect is studied. Studies have shown that the vertical isolation effect increases with the increase of vertical damping ratio. When the damping ratio reaches a certain value, the isolated effect leveles off. When calculating model is adopted as the hierarchical model, vertical isolation effect has nothing to do with the increases of earthquake intensity.

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36

Popov, G. "Theoretical Analysis of Damping Properties of two-Degree-of-Freedom Linear Vibrational Systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 1 (January 1996): 79–90. http://dx.doi.org/10.1243/pime_proc_1996_210_172_02.

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Analytical solutions for complete two-degree-of-freedom (2 DOF) vibrational systems comprising primary and secondary resilient and damping elements and subjected to a harmonic base excitation are obtained for the first time and presented in terms of transmissibility of primary and secondary mass and resonance and invariant frequencies of primary mass, which is considered to be the object of isolation. Analytical expressions for optimum values of main system parameters including primary and secondary dampings, mass ratio and secondary and primary springs stiffness ratios are also newly presented. Damping properties of systems are analysed for the case of a constant optimum damping, which minimizes the primary mass transmissibility at the lowest resonance frequency, and for the case of frequency-variable optimum damping, providing the minimization over the entire range of forced frequency. The expressions for optimum primary and secondary dampings are given in the form of quadratic algebraic equations for the case of complete 2 DOF systems. The influence of the mass and spring stiffness ratios on the system response is investigated as well. The obtained results, being of a general nature and obtained for large ranges of main parameters, can be applied to different classes of vibration isolation problems, such as isolation of a large item of machinery, a light piece of instrumentation or a ground vehicle.

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Issa, J. S. "Ground motion isolation using a newly designed vibration absorber." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 3 (October 12, 2011): 636–47. http://dx.doi.org/10.1177/0954406211417548.

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A new vibration absorber setup for vibration attenuation in single degree of freedom systems subjected to harmonic base motion is proposed. The absorber is placed so as to separate between the vibrating ground and the main undamped system. It consists of a mas spring damper directly connected to the vibrating ground. The main system is modelled as a mass spring attached to the absorber's mass. The optimal absorber parameters are determined with the aim of reducing the steady-state amplitude of the main mass. It is shown that the amplitude of the main mass passes through three fixed points, two of which are used in the determination of the optimal shape of the transfer function. One of the fixed points is independent of the damping ratio and the second is independent of both the damping and tuning ratios. For this setup, the solution is not unique since the ultimate design is reached by a complete isolation of the main mass from the moving ground and is attained by removing the absorber's damper and stiffness. Since this solution is not physically achievable, for a given mass ratio of the system, the smallest tuning ratio which ensures structural integrity of the system is selected. The optimal damping ratio which yields the optimal shape of the objective function is determined analytically in terms of the mass and tuning ratios. A design flowchart is presented to be used for the design of such absorbers.

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Xu, Chao, Zhao-Dong Xu, Xing-Huai Huang, Ye-Shou Xu, and Teng Ge. "Modeling and analysis of a viscoelastic micro-vibration isolation and mitigation platform for spacecraft." Journal of Vibration and Control 24, no. 18 (August 9, 2017): 4337–52. http://dx.doi.org/10.1177/1077546317724321.

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A new viscoelastic micro-vibration isolation and mitigation platform is proposed to reduce disturbances generated by flywheels on board spacecraft. Firstly, property tests on the high-damping viscoelastic material used in the micro-vibration isolation and mitigation element are conducted. Experimental results show that the developed viscoelastic material has better energy dissipation capability under micro-vibration conditions. A mathematic model is employed to describe the dynamic properties of the high-damping viscoelastic material and is used to model the isolation and mitigation element. Secondly, a viscoelastic micro-vibration isolation and mitigation platform, which consists of four elements, is proposed and the analytical model of the coupled system that consists of the platform with flywheel is established. Finally, the isolation and mitigation performances of this micro-vibration isolation and mitigation platform are analyzed and discussed. The results show that the isolation and mitigation platform can effectively reduce the micro-vibration disturbances induced by the flywheel.

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Kohl, Ondrej, Lubomír Pešík, and Antonin Skarolek. "Driver Seat Differential Pneumatic System with Air Damping." Applied Mechanics and Materials 732 (February 2015): 191–94. http://dx.doi.org/10.4028/www.scientific.net/amm.732.191.

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The paper shows a possibility of the tuning mechanical system by means of two pneumatic springs in a differential configuration connected with a throttle valve. The springs are inserted into the lead mechanism and connected to its parts, and to its supporting platform. The vibrations, transferred from the kinematic excitation of the base, are intended to be minimized. The vibration isolation by means of pneumatic springs is available in many technical systems, e.g. in supports of heavy machinery as well as in systems characterized by the human interaction, such as driver seats, ambulance couchettes, etc. The pneumatic springs provide the option of adaption of the stiffness, and herewith the adaption of the natural frequency of the system according to the exciting frequency. In cases of application of the object vibration isolation, they can change the load characteristics in a relative large range. In the studied case of the differential spring configuration, the springs are connected with an air pipe to the throttle valve. The air being exchanged during the motion period comes through the valve, the cross-section of which determines the time delay of the pneumatic sub-system thus creating a hysteresis of load characteristic of the spring support. This brings an additional, controllable damping to such a system that is profitable in most vibration isolation cases.

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Tang, Xia Qing, Jun Qiang Gao, Li Bin Guo, and Huan Zhang. "Study on Dynamics Characteristics of SINS Damping System in Shock Environment." Applied Mechanics and Materials 397-400 (September 2013): 355–58. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.355.

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Dynamics characteristics of SINS damping system in shock environment were analyzed by finite element method, as the deformation of dampers may leads to the accuracy loss of SINS. In addition, the influence of absorber stiffness and damping coefficient on dynamics characteristics were studied. The results indicate that the decoupling of vibrations is significant for the accuracy of SINS. However, considering the almost impossible of completely decoupled vibrations, its necessary to carry out an optimal design of the absorber stiffness and damping coefficient to maintain the accuracy of SINS while meeting the requirement of vibration isolation.

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LIU Xing-tian, 刘兴天, 孔祥森 KONG Xiang-sen, 申军烽 SHEN Jun-feng, and 周徐斌 ZHOU Xu-bin. "Vibration isolator with relaxation type damping for micro-vibration isolation from satellite remote sensors." Optics and Precision Engineering 25, no. 9 (2017): 2448–53. http://dx.doi.org/10.3788/ope.20172509.2448.

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Zheng, Zhanpeng, Chengjun Wu, Hengliang Wu, Jianyong Wang, and Xiaofei Lei. "Vibration isolation performance of nonobstructive particle damping in a machine rack." Journal of Vibration and Control 25, no. 5 (November 28, 2018): 1122–30. http://dx.doi.org/10.1177/1077546318814039.

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Nonobstructive particle damping (NOPD) is a novel passive control technology with strong nonlinear-damping. Many scholars put effort into the research on the internal mechanism of NOPD. In contrast, the application of NOPD to engineering has not received much research effort. A theoretical model based on the principle of gas–solid flows, which is employed to evaluate damping effect of NOPD and to predict dynamic response of a machine rack by a co-simulation approach, is established in this paper. In view of the difference between damping effect acting on the lateral and bottom of NOPD holes directly, total damping force is divided into lateral damping force and bottom damping force according to the Janssen theory of stress changed direction. Moreover, NOPD technology is applied to a machine rack for discussing its vibration isolation performance. The results indicate that NOPD technology can suppress the intense vibration, especially between 4000 Hz and 8000 Hz. It is noted that the theoretical model of NOPD can accurately predict the dynamic response of the machine rack with NOPD. The 1/3 Octave vibration energy spectrum indicates that NOPD technics can dissipate the vibration energy of the machine rack at full frequency, especially in 31.5 Hz, and attenuation up to 39.75 dB.

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43

Boyd, James. "Fluid amplifiers and vibration damping and isolation systems." Journal of the Acoustical Society of America 128, no. 6 (2010): 3823. http://dx.doi.org/10.1121/1.3544417.

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Haberman, Michael R., Carolyn C. Seepersad, and Preston S. Wilson. "Vibration damping and isolation using negative stiffness structures." Journal of the Acoustical Society of America 138, no. 3 (September 2015): 1920. http://dx.doi.org/10.1121/1.4934041.

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Dean, Robert, George Flowers, Nicole Sanders, Roland Horvath, Michael Kranz, and Michael Whitley. "Micromachined Vibration Isolation Filters to Enhance Packaging for Mechanically Harsh Environments." Journal of Microelectronics and Electronic Packaging 2, no. 4 (October 1, 2005): 223–31. http://dx.doi.org/10.4071/1551-4897-2.4.223.

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Some harsh environments, such as those encountered by missiles, rockets and various types of industrial machinery, contain high frequency mechanical vibrations. Unfortunately, some very useful components are sensitive to these high frequency vibrations. Examples include MEMS gyroscopes, oscillators and some micro-optics. Exposure to high frequency mechanical vibrations present in the operating environment can result in problems ranging from an increased noise floor to component failure. Passive micromachined silicon lowpass filter structures (spring-mass-damper) have been demonstrated in recent years. Since they usually possess a low vertical profile, they can be utilized as the packaging substrate for the sensitive component requiring vibration isolation. The performance of these filter structures is typically limited by low damping and a lack of tunability after fabrication. However, filter performance can be enhanced by integrating fluidic damping techniques with the passive filter or by integrating a micromachined actuator with state feedback to realize an active filter. The active filter has the additional advantage of post fabrication tunability.

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Li, Rui, Li Min He, Xue Qin Li, and Ke Long Chen. "Control and Simulation on Vertical Vibration of Subway Rail via Magnetorheological Isolators." Advanced Materials Research 482-484 (February 2012): 1313–16. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1313.

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A semi-active vibration system via magnetorheological (MR) isolators can contribute to enhance isolation performance. In this study, a vertical vibration model of subway rail via MR isolators was proposed. The adjustable damping and stiffness characteristics of isolator were also analyzed. Based on a floating slab track (FST) isolation model, a variable domain fuzzy control system was proposed to decrease the vertical vibration force. The results simulated in MATLAB indicate that compared with passive isolators, FST system via MR isolators decease vertical vibration force transmissibility ratio to 40% at low frequency (15Hz) and to 31% at medium frequency (30Hz).

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Diala, Uchenna, SM Mahdi Mofidian, Zi-Qiang Lang, and Hamzeh Bardaweel. "Analysis and optimal design of a vibration isolation system combined with electromagnetic energy harvester." Journal of Intelligent Material Systems and Structures 30, no. 16 (July 17, 2019): 2382–95. http://dx.doi.org/10.1177/1045389x19862377.

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This work investigates a vibration isolation energy harvesting system and studies its design to achieve an optimal performance. The system uses a combination of elastic and magnetic components to facilitate its dual functionality. A prototype of the vibration isolation energy harvesting device is fabricated and examined experimentally. A mathematical model is developed using first principle and analyzed using the output frequency response function method. Results from model analysis show an excellent agreement with experiment. Since any vibration isolation energy harvesting system is required to perform two functions simultaneously, optimization of the system is carried out to maximize energy conversion efficiency without jeopardizing the system’s vibration isolation performance. To the knowledge of the authors, this work is the first effort to tackle the issue of simultaneous vibration isolation energy harvesting using an analytical approach. Explicit analytical relationships describing the vibration isolation energy harvesting system transmissibility and energy conversion efficiency are developed. Results exhibit a maximum attainable energy conversion efficiency in the order of 1%. Results suggest that for low acceleration levels, lower damping values are favorable and yield higher conversion efficiencies and improved vibration isolation characteristics. At higher acceleration, there is a trade-off where lower damping values worsen vibration isolation but yield higher conversion efficiencies.

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Ledezma Ramirez, Diego Francisco, Pablo Ernesto Tapia Gonzalez, Martín Castillo Morales, Tania Paloma Berber Solano, and Adriana Salas Zamarripa. "Shock response of a two-stage vibration isolation system." Ingeniería Investigación y Tecnología 21, no. 2 (April 1, 2020): 1–11. http://dx.doi.org/10.22201/fi.25940732e.2020.21n2.018.

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Abstract. Two-degree of freedom system, or two-stage mount are used to improve the high frequency vibration isolation performance with the disadvantage of increasing the mass of the system and adding a second resonance. The vibration isolation property is a well-understood topic for harmonic vibration considering linear and nonlinear elements, but not its shock response. The absolute and relative response of a two-stage mount under shock excitation is investigated in this paper. Analysing the effect of the mass ratio between the two-stage, and its respective viscous damping. The potential advantages and issues behind this system are discussed and compared with the single mount. Experimental validation was performed using two commercial isolator and different masses. Findings suggested that a large secondary mass could reduce the shock response in terms of absolute motion. This effect is only significant for the case of short pulses and when the added mass is at least five times greater than the main mass. Being useful to have light damping only on the secondary stage.

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Xie, Xiling, Jianchao Diao, Yinglei Xu, and Zhiyi Zhang. "Performance of a low-frequency hybrid vibration isolation platform for vibration-sensitive devices." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 4 (July 30, 2018): 1164–75. http://dx.doi.org/10.1177/1461348418791336.

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For preventing the fragile optical communication devices from malfunction caused by the low-frequency seismic excitation, a novel three-dimensional hybrid isolation platform is proposed in this paper. To isolate the horizontal and vertical vibrations simultaneously, the platform is designed as a combination of a rolling isolation system and four three-parameter isolators with active damping. By deriving the governing equations of the three-parameter isolators and the profile of the concave rolling surface, the dynamic model of the whole platform is constructed. Numerical results indicate that the isolation platform has an effective suppression of the horizontal and vertical vibrations. To verify the isolation performance of the hybrid isolation platform, an experiment is conducted in the targeting frequency range. Compared to the amplification factor of 6.2 dB of the three-parameter isolator, the test results exhibit that the hybrid isolation shows no amplification effect in the vertical direction, and the root mean square value of acceleration responses can be decreased by more than 65% in the frequency range of 0–32 Hz. In the horizontal direction, the reduction of the root mean square value of acceleration responses is up to 85% in the same frequency range.

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Zhao, Qun, Chen Zhang, and Jin Fang Zhao. "Design of Double-Deck Isolation Systems." Advanced Materials Research 118-120 (June 2010): 389–93. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.389.

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On the basis of the powerflow theory and four-end parameter analysis method, the responses and the powerflow characteristics of the vibration transfer path system are examined. The sensitivity of non-linear damping is employed as measurement criterion. The powerflow and powerflow sensitivity are obtained and the effect on powerflow and powerflow sensitivity of dry friction damping, fluid damping and structural damping is studied. Numerical results are also presented and discussed. It is supposed to study the sensitivity of these parameters, to estimate the effect of the change of parameters, to improve the design performance.

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Journal articles on the topic 'Vibration isolation and damping'

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