scholarly journals Exact Solutions for a Novel H2 Optimal Design of Electromagnetic Tuned Mass Damper

2021 ◽  
Author(s):  
Ge Li ◽  
Qibo Mao ◽  
Yifan Luo ◽  
Yong Wang ◽  
Lei Liu
Keyword(s):  
Vibration Control ◽  
Optimization Design ◽  
Damping Ratio ◽  
Tuned Mass Damper ◽  
Parameters Optimization ◽  
Structural Vibration ◽  
Control Effect ◽  
Mass Damper ◽  
Two Parameters ◽  
H2 Optimization

To realize structural vibration control,a two parameters H2 optimization design was proposed to optimize the tuning ratio and damping ratio for electromagnetic tuned mass damper (EMTMD). The control effect of this two parameters optimization design is better than that of classical tuned mass damper (TMD).For this two parameters optimization,the most important thing is that the inductance of the coil can be set very small and the external load resistance can be positive ,which can avoid the use of complex negative impedance circuit. If Ref.[6] were designed according to the H2 optimization of two parameters, the EMTMD can be used for multi-modal vibration control of structures without connecting negative inductance and negative resistance spontaneously.

scholarly journals Development of a Frequency-Adjustable Tuned Mass Damper (FATMD) for Structural Vibration Control

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Huaguo Gao ◽  
Congbao Wang ◽  
Chen Huang ◽  
Wenlong Shi ◽  
Linsheng Huo
Keyword(s):  
Damping Ratio ◽  
Tuned Mass Damper ◽  
Vertical Vibration ◽  
Structural Vibration ◽  
Kinematic Equation ◽  
Pedestrian Bridge ◽  
Long Span ◽  
Mass Damper ◽  
Excitation Frequencies ◽  
Simple Assembly

The tuned mass damper (TMD) can be applied to suppress earthquake, wind, and pedestrian- and machine-induced vibration in factory buildings or large span structures. However, the traditional TMD with a fixed frequency will not be able to perform effectively against the frequency variations in multiple hazards. This paper proposed a frequency-adjustable tuned mass damper (FATMD) to solve this limitation of current TMD. The FATMD presented in this paper is composed of a simple assembly consisting of a supported beam with a mass, in which the frequency of the FATMD is changed by adjusting the span of the beam. The kinematic equation of a single degree of freedom (SDOF) structure installed with an FATMD is established to analyze the effect of the damping ratio, mass ratio, and stiffness on the vibration damping. The fundamental frequency of the FATMD at different spans is verified by simulation and experiments. Forced vibration experiments with different excitation frequencies are also conducted to verify the performance of the FATMD. The results show that the proposed FATMD can effectively suppress the vertical vibration of structures at different excitation frequencies, including frequencies at a range higher than what a traditional TMD may not be able to suppress. Additionally, the proposed FATMD is applied to a long-span pedestrian bridge which vibrates frequently due to the walking of pedestrians, the running of escalators, and earthquakes. The numerical results indicate that the FATMD can effectively reduce the vertical vibration of the pedestrian bridge under the excitations of pedestrians, escalators, and earthquakes.

Vibration Control Effect Analysis on Tuned Mass Damper System Used in Urban Transportation

2012 ◽  
Vol 468-471 ◽  
pp. 1294-1299 ◽  
Author(s):  
Li Li ◽  
Chuan Zhi Geng ◽  
Ye Tian ◽  
Qing Yu
Keyword(s):  
Vibration Control ◽  
Impact Load ◽  
Effective Means ◽  
Urban Transportation ◽  
Tuned Mass Damper ◽  
Control Effect ◽  
Effect Analysis ◽  
Mass Damper ◽  
Reduction Effect ◽  
And Performance

With the development of urban transportation, vibration and noise control has attracted increasing attention. Vibration and noise level has become one of the important hallmarks of evaluating the influence of urban transportation to environment. As Tuned Mass Damper (TMD) is an effective means of vibration control, there is more and more emphasis on its research and application. Reasonably designed TMD can reduce vibration and noise caused by wheel/rail impact. So how to take into account the complex factors to improve the design of the TMD is still the important issue. TMD system is an effective structure. In order to study its vibration reduction effect, modal calculation and wheel-set drop simulation have been analyzed in this paper. Through varying the mass of TMD, the performance of vibration attenuation have been verified. The stability and performance of damping property under impact load have been confirmed by wheel-set drop simulation. Comparing the track which uses TMD and the normal one, the effect of TMD system can be testified effectively.

Optimum Design of a New Tuned Inerter-Torsional-Mass-Damper Passive Vibration Control for Stochastically Motion-Excited Structures

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Wei-Che Tai
Keyword(s):  
Vibration Control ◽  
Degrees Of Freedom ◽  
Damping Ratio ◽  
Inertial Forces ◽  
Viscous Damper ◽  
Single Degree Of Freedom ◽  
Amplification Effect ◽  
Tuning Ratio ◽  
Mass Damper ◽  
H2 Optimization

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

scholarly journals Comparison Study of Vibration Control Effects between Suspended Tuned Mass Damper and Particle Damper

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zheng Lu ◽  
Dianchao Wang ◽  
Peizhen Li
Keyword(s):  
Vibration Control ◽  
Damping Ratio ◽  
Tuned Mass Damper ◽  
Test Model ◽  
Momentum Exchange ◽  
Equivalent Damping ◽  
Exchange Effects ◽  
Mass Damper ◽  
Damping Effects ◽  
Tuning Frequency

The vibration control performance and its influencing factors of a tuned mass damper and a particle damper are examined by a single degree of freedom structure with such devices. The vibration control effects between these two dampers are also investigated. Increasing the mass ratio of the damper can improve the damping effects; under the condition of tuning frequency, the damping effects are remarkable. However, the more the deviation from the tuned frequency, the less controlling effects can be obtained. The damping effect of a particle damper is generally better than that of a tuned mass damper. For this test model, the particle damper can improve primary structure’s equivalent damping ratio 19 times to the original one’s, while the tuned mass damper can be 13 times. The reason lies in the fact that the particle damper can dissipate input energy by tuning mass, collision, impact, and friction between particles and the container and the momentum exchange effects between the secondary damper mass and the primary structure.

scholarly journals Passive vibration control in a civil structure: Experimental results

2019 ◽  
Vol 52 (7-8) ◽  
pp. 938-946 ◽  
Author(s):  
Josué Enríquez-Zárate ◽  
Hugo Francisco Abundis-Fong ◽  
Ramiro Velázquez ◽  
Sebastián Gutiérrez
Keyword(s):  
Vibration Control ◽  
Structural Control ◽  
Passive Control ◽  
Tuned Mass Damper ◽  
Experimental Results ◽  
Structural Vibration ◽  
Control Technique ◽  
Primary System ◽  
Vibration Absorption ◽  
Mass Damper

The problem of vibrations in civil structures is common; nevertheless, its negative effects can be significantly reduced using structural control methods with intention of maintaining structural welfare as much as possible. This work deals with the study of structural vibration control in a model of a civil-like structure, which consists of three-level building with a tuned mass damper implemented as a passive vibration absorber, mounted on the top of the structure, to attenuate the harmonic vibrations provided by an electromagnetic actuator connected at the base of the primary system. The action of the tuned mass damper is evaluated from an energy approach. The dissipation of energy in the overall system is conducted in an experimental way, where the passive control technique is designed to minimize the undesirable forced dynamic response of the main structure via the tuned mass damper. Experimental results are provided to show the effective performance of the proposed passive vibration absorption scheme to suppress resonant frequency harmonic excitations disturbing the primary system, evaluating the performance energy and contribution of the dissipative device for the energy release in the overall system.

Optimum Design of a New Tuned Inerter Mass Damper (TIMD) Passive Vibration Control for Stochastically Motion-Excited Structures

2019 ◽  
Author(s):  
Wei-Che Tai
Keyword(s):  
Vibration Control ◽  
Damping Ratio ◽  
Degree Of Freedom ◽  
Rotational Inertia ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Tuning Ratio ◽  
Mass Damper ◽  
Two Degree Of Freedom ◽  
H2 Optimization

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

scholarly journals Lever-Type Tuned Mass Damper for Alleviating Dynamic Responses

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Eun-Taik Lee ◽  
Hee-Chang Eun
Keyword(s):  
Vibration Control ◽  
Numerical Experiments ◽  
Degrees Of Freedom ◽  
Tuned Mass Damper ◽  
Dynamic Responses ◽  
Structural Vibration ◽  
Constraint Condition ◽  
Structural Vibration Control ◽  
Mass Damper ◽  
Vibration Responses

This study considers the structural vibration control by a lever-type tuned mass damper (LTMD). The LTMD has a constraint condition to restrict the motion at both ends of the lever. The LTMD controls the dynamic responses at two locations combining the tuned mass damper (TMD) and the constraint condition. The parameters of the LTMD are firstly estimated from the TMD parameters and should be modified by them to obtain from numerical results. The effectiveness of the LTMD is illustrated in two numerical experiments, and the sensitivity of the parameters is numerically investigated. It is shown that the LTMD leads to the remarkable displacement reduction and exhibits more definite control than the TMD system because the LTMD controls the vibration responses at two DOFs. More displacement responses are reduced when the installation locations of the LTMD coincide with the nodes to represent the largest modes’ values at the first and second modes. The application of the LTMD at the dynamic system of a few degrees of freedom (DOFs) is more effective than the system of many DOFs.

scholarly journals Active control for machinery equipment induced structural vibration using H∞ criterion and PSO technique

2019 ◽  
Vol 39 (1) ◽  
pp. 21-28
Author(s):  
Xu Jian ◽  
Zhang Tong-yi ◽  
Huang Wei ◽  
Hu Ming-yi ◽  
Qin Jing-wei ◽  
...  
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Control Strategy ◽  
Composite System ◽  
Vibration Suppression ◽  
Tuned Mass Damper ◽  
Structural Vibration ◽  
Swarm Optimization ◽  
Mass Damper ◽  
Active Control Strategy

In this paper, machinery equipment induced structural vibration was investigated and a composite system for structure and equipment was proposed. Tuned mass damper (TMD) and active tuned mass damper (ATMD) were respectively performed for vibration control, in addition, particle swarm optimization (PSO) was utilized for pursuing an optimal active control. Numerical results confirmed that the presented active control strategy could achieve a better vibration suppression compared to TMD control. The PSO based active control also gave inspiration for improving the traditional vibration control.

Sign in / Sign up

Export Citation Format

Share Document