A fundamental study on impact dampers

Ema, Satoshi; Marui, Etsuo

doi:10.1016/0890-6955(94)90009-4

Cited by 48 publications

(21 citation statements)

References 6 publications

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“…Applications of impact damper to attenuate the undesirable structure vibration, such as turbine blades, and high-speed railway bridge, robot arms and so on, have been investigated analytically, numerically and experimentally for many years (Dlmentberg and Iourtchenko, 2004;Ema and Marui, 1996;Cheng and Shiu, 2001;Carotti and Turci, 1999;Zhang and Angeles, 2005). Cheng and Wang (2003) discussed the behaviors of a resilient impact damper in free damped vibration, and the results showed that the clearance between two masses in an effect impact damper ought to be smaller than twice of the initial displacement of the main mass in a vibration system if the system is stimulated by an initial displacement only.…”

Section: Introductionmentioning

confidence: 99%

Inner mass impact damper for attenuating structure vibration

Jian

2006

International Journal of Solids and Structures

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The behaviors of a vibration system suppressed with an impact damper are investigated, where the impact damper is simplified as a combination of spring and viscous damping. The analytical theory for the optimal impact control algorithms for impact damper is developed, and the accurate expressions are derived for the optimal values of the impact damper damping and initial displacement in a single-degree-of-freedom structure. The relation between coefficient of restitution and impact damping ratio is obtained. The investigation shows that the effective reduction of the vibration response is nearly independent of the number of impacts, but primarily related to the type of collision which the impact mass collides with the main mass face-to-face. This theory is generalized to continuous structures. An example of an impact damper in a rotating cantilever beam demonstrates that the impact dampers are suitable for attenuating the impulse response of structures unconditional stable without the requirement of the accuracy of the modal information.

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Section: Introductionmentioning

confidence: 99%

Inner mass impact damper for attenuating structure vibration

Jian

2006

International Journal of Solids and Structures

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“…The gap size is simply the distance between the top of the particle bed and the ceiling of the enclosure (Bapat & Sankar, 1985). These same results were later confirmed independently in an experiment with an impact damper attached to a leaf spring with a mass (Ema & Marui, 1994). Eight different types of enclosure were investigated, including plastic bags, metal boxes, plastic boxes, and bags with an internal framework.…”

Section: Introductionmentioning

confidence: 61%

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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“…Chetterjee and Malik [25], Collette [26], Semercigil [27], Cheng [28] and Li [29] determined the damping performance of impact dampers used in practical applications in their carefully prepared experiments. Ema and Marui [30] concluded that in the free decaying response of a spring mass system, the damping rate of the system increases with a corresponding increase in vibration amplitude. They also found that the best damping performance occurs for particular combinations of the mass and clearance ratios and that it also depends on the initial spring displacement.…”

Section: Introductionmentioning

confidence: 98%

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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A fundamental study on impact dampers

Cited by 48 publications

References 6 publications

Inner mass impact damper for attenuating structure vibration

Inner mass impact damper for attenuating structure vibration

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

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

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