The damping performance of a single particle impact damper

Duncan, M.R.; Wassgren, Carl; Krousgrill, Charles M.

doi:10.1016/j.jsv.2004.09.028

Cited by 81 publications

(54 citation statements)

References 23 publications

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“…Thus, using the assumed mode approach retaining only one mode of the vibrating multibody system, the same analysis as the one developed for the SDOF system (Araki et al) [16] can be applied to Eqs (6) and (7) to study the damper problem of the multibody system.…”

Section: Approximate Analysismentioning

confidence: 99%

“…Many theoretical, numerical, and experimental studies have been conducted for the characterization of impact damping effect [1][2][3][4][5][6]. Masri and Chaughey [2] carried out the first rigorous theoretical analysis of the dynamics and stability of the impact damper without gravity, using a coefficient of restitution to model the collisions between the mass and vibrating structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Particle Damping with Granular Materials for Multi Degree of Freedom System

Inoue

Yokomichi

Hiraki

2011

Shock and Vibration

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Abstract.A particle damper consists of a bed of granular materials moving in cavities within a multi degree-of-freedom (MDOF) structure. This paper deals with the damping effects on forced vibrations of a MDOF structure provided with the vertical particle dampers. In the analysis, the particle bed is assumed to be a single mass, and the collisions between the granules and the cavities are completely inelastic, i.e., all energy dissipation mechanisms are wrapped into zero coefficient of restitution. To predict the particle damping effect, equations of motion are developed in terms of equivalent single degree-of-freedom (SDOF) system and damper mass with use made of modal approach. In this report, the periodic vibration model comprising sustained contact on or separation of the damper mass from vibrating structure is developed. A digital model is also formulated to simulate the damped motion of the physical system, taking account of all vibration modes. Numerical and experimental studies are made of the damping performance of plural dampers located at selected positions throughout a 3MDOF system. The experimental results confirm numerical prediction that collision between granules and structures is completely inelastic as the contributing mechanism of damping in the vertical vibration. It is found that particle dampers with properly selected mass ratios and clearances effectively suppress the resonance peaks over a wide frequency range.

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Section: Approximate Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Particle Damping with Granular Materials for Multi Degree of Freedom System

Inoue

Yokomichi

Hiraki

2011

Shock and Vibration

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“…However, of particular note is the fact that Popplewell et al [15] and Bapat et al [17] found in their investigations into the forced vibration of such systems that an impact damper produces negative damping at frequencies lower than the original natural frequency and that the system will vibrate more with than without the presence of the impact damper. Furthermore, Masri et al [20] and Duncan et al [31] reported that the damping which occurs at very large excitation amplitudes approaches the detuned value, which corresponds to the case when the particle masses are moving together with the structure.…”

Section: Introductionmentioning

confidence: 99%

Study of the Damping Mechanisms of Loose Spring Skirts on Vibrating Pipes

2010

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Damping of the loose spring skirt (LSS) of a vibrating pipe under operating conditions was studied experimentally and numerically. Motion images made using a high speed charge-coupled device (CCD) camera as well as acceleration signals were analyzed in order to correlate the physical states of the LSS pipe system with the vibration transmissibility (TM) through the pipe. Experiments on the pipe undergoing harmonic excitation demonstrate that the damping of the LSS is caused by the same mechanism as with a conventional impact damper. Measurements of the acceleration TM as a function of excitation amplitude verified that the momentum exchange between the pipe and the auxiliary spring is the cause of the damping produced by the LSS pipe. Another finding of this research is that the experimental representation of the resonance shift phenomenon is related to two main operating conditions, namely: 1) the driving frequency and 2) the excitation amplitude. This research demonstrated the occurrence of the resonance shift phenomenon through experimental mapping of the system response at increasing excitation amplitudes using frequency sweep tests. Simulations of the LSS pipe system based on principal coordinate and impact damping analysis were performed in order to investigate and provide better explanations for LSS pipe system damping mechanisms. As a result of this research study, a new damping mechanism is proposed which is different from previous damping models. This research study has also addressed more practical boundary and excitation conditions for LSS pipe systems.

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“…The corresponding maximum degree of damping increased with increasing mass ratio and coefficient of restitution, but decreased with increasing structural damping ratio. Field plots of the damping ratio were also presented as functions of oscillation amplitude and frequency, to demonstrate the damper performance over a range of design parameters and operating conditions (Duncan, Wassgren, & Krousgrill, 2005). The work involved multi-unit particle dampers, which are passive damping devices involving granular particles in some cavities of a primary system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size and Packing Ratio of PID on Vibration Amplitude of Beam

Kachare¹,

Bimleshkumar²

2013

J MECH ENG SCI

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Everything in the universe that has mass possesses stiffness and intrinsic damping. Owing to the stiffness property, mass will vibrate when excited and its intrinsic damping property will act to stop the vibration. The particle impact damper (PID) is a very interesting damper that affects impact and friction effects of particles by means of energy dissipation. PID is a means for achieving high structural damping by using a particle-filled enclosure attached to a structure. The particles absorb the kinetic energy of the structure and convert it into heat through inelastic collisions between the particles themselves and between the particles and the walls of the enclosure. In this work, PID is measured for a cantilever mild steel beam with an enclosure attached to its free end; copper particles are used in this study. The PID is found to be highly nonlinear. The most useful observation is that for a very small weight penalty (about 7% to 8 %), the maximum damped amplitude of vibration at resonance with a PID, is about 9 to 10 times smaller than that without a PID. It is for more than that of with only intrinsic material damping of a majority of structural metals. A satisfactory comparison of damping with and without particles through experimentation is observed. The effect of the size of the particles on the damping performance of the beam and the effective packing ratio can be identified. It is also shown that as the packing ratio changes, the contributions of the phenomena of impact and friction towards damping also change. It is encouraging that despite its deceptive simplicity, the model captures the essential physics of PID.

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The damping performance of a single particle impact damper

Cited by 81 publications

References 23 publications

Particle Damping with Granular Materials for Multi Degree of Freedom System

Particle Damping with Granular Materials for Multi Degree of Freedom System

Study of the Damping Mechanisms of Loose Spring Skirts on Vibrating Pipes

Effect of Particle Size and Packing Ratio of PID on Vibration Amplitude of Beam

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