Experimental characterization of a nonlinear vibration absorber using free vibration

Tang, Bin; Brennan, M.J.; Gatti, Gianluca; Ferguson, N.S.

doi:10.1016/j.jsv.2015.12.040

Cited by 26 publications

(24 citation statements)

References 25 publications

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“…Tang et al [ 116 ] experimentally investigated the assessment of the nonlinear vibration absorber parameters from free vibration tests. HT was utilized to estimate both instantaneous amplitude and damped natural frequency.…”

Section: Nonlinear Damping Identification Methodsmentioning

confidence: 99%

A Critical Review of Nonlinear Damping Identification in Structural Dynamics: Methods, Applications, and Challenges

Al-hababi

Cao

Saleh

et al. 2020

Sensors

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In recent decades, nonlinear damping identification (NDI) in structural dynamics has attracted wide research interests and intensive studies. Different NDI strategies, from conventional to more advanced, have been developed for a variety of structural types. With apparent advantages over classical linear methods, these strategies are able to quantify the nonlinear damping characteristics, providing powerful tools for the analysis and design of complex engineering structures. Since the current trend in many applications tends to more advanced and sophisticated applications, it is of great necessity to work on developing these methods to keep pace with this progress. Moreover, NDI can provide an effective and promising tool for structural damage detection purposes, where the changes in the dynamic features of structures can be correlated with damage levels. This review paper provides an overview of NDI methods by explaining the fundamental challenges and potentials of these methods based on the available literature. Furthermore, this research offers a comprehensive survey of different applications and future research trends of NDI. For potential development and application work for nonlinear damping methods, the anticipated results and recommendations of the current paper can assist researchers and developers worldwide to find out the gaps and unsolved issues in the field of NDI.

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Section: Nonlinear Damping Identification Methodsmentioning

confidence: 99%

A Critical Review of Nonlinear Damping Identification in Structural Dynamics: Methods, Applications, and Challenges

Al-hababi

Cao

Saleh

et al. 2020

Sensors

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“…One of the well-developed approaches for mitigating vibration levels is to add a secondary linear oscillator to the existing system which is commonly called the DVA. 6–11 The application of DVA theory has already been proved to be a reliable and effective way to reduce the structural vibration at certain frequencies. 12–17 In this paper, the theory of DVA is applied to reduce the carbody abnormal pitching motion of low-floor railway train around 8 Hz.…”

Section: Research Backgroundmentioning

confidence: 99%

Reduction of vertical abnormal vibration in carbodies of low-floor railway trains by using a dynamic vibration absorber

Wang

Zeng

Lai

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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A field test on the dynamic performance of a 100% low-floor railway train with five cars was conducted, and a vertical vibration at around 8 Hz was mainly studied for the background of the research. The vibration around 8 Hz, defined as the abnormal vertical vibration, was proved to be due to the pitching motion of the carbodies, which significantly affected the dynamic performance of the vehicle with a maximum increase of 0.309 in the vertical Sperling index. The dynamic vibration absorber theory was applied to reduce the abnormal vibration of carbodies to around 8 Hz by building a vertical mathematic model and a three-dimensional dynamical simulation model. The results of the theoretical analysis show that the stiffness of the articulated device between carbodies is the reason for the pitching motions at around 8 Hz, and the stiffness significantly affects the main frequency of the vertical vibration of carbodies. What’s more, the application of dynamic vibration absorber theory on low-floor railway trains can reduce the vertical abnormal vibration effectively. Yet, reasonable suspension parameters are needed; otherwise, the vibration of carbodies, including the mass ratio, the suspension frequency, the damping ratio, and the suspended location would be aggravated. Optimal suspension parameters of the dynamic vibration absorber system were used in the simulation model, and the result shows a good agreement with the numerical results; the attached dynamic vibration absorber system on carbodies significantly reduces the vibration of carbodies at around 8 Hz. However, it should be noted that the dynamic vibration absorber is only effective at high-speed stage (beyond 40 km/h) where the pitching motion of carbodies is obvious; this conclusion is consistent with the results of the field test.

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“…Ivana Koavcic studied a vibration isolator consisting of a vertical linear spring and two nonlinear prestressing oblique springs [15]. Based on a free vibration test, Bin Tang simply estimated the performance of the absorber by connecting the nonlinear absorber with the vibrating screen [16]. Pellegrini studied an alternative method of obtaining mechanical vibration by using two kinds of energy collectors with stable structures.…”

Section: Introductionmentioning

confidence: 99%

An Output Force Control for Robotic Manipulator by Changing the Spring Stiffness

Wang

Zheng

et al. 2020

Mathematical Problems in Engineering

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This paper presents an output control for a manipulator by changing the spring stiffness. Through the modeling and analysis of the nonlinear stiffness characteristics of the crank-rocker mechanism, and using the zero stiffness domain search method to select the appropriate spring stiffness, using different spring stiffness to establish different mechanism models, the robot can finally control the output of ideal constant force, and at the same time, the analysis results are applied to the improved design of the tire grabbing manipulator. Through this method, the tire grabbing manipulator becomes a constant grabbing force mechanism, and the mechanism is transformed from a rigid-body mechanism to a pseudo-rigid-body mechanism. The accuracy and stability of the whole system are greatly improved. In this study, the method of adding spring to each joint of the linkage mechanism is applied to the improvement design of the linkage mechanism, and the four-bar constant force mechanism is designed for the first time, which expands the application field of the nonlinear stiffness characteristics of the linkage mechanism, and has great application value to the improvement design of the mechanical system with the linkage mechanism and the control of the output force.

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Experimental characterization of a nonlinear vibration absorber using free vibration

Cited by 26 publications

References 25 publications

A Critical Review of Nonlinear Damping Identification in Structural Dynamics: Methods, Applications, and Challenges

A Critical Review of Nonlinear Damping Identification in Structural Dynamics: Methods, Applications, and Challenges

Reduction of vertical abnormal vibration in carbodies of low-floor railway trains by using a dynamic vibration absorber

An Output Force Control for Robotic Manipulator by Changing the Spring Stiffness

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