Experimental investigation and theoretical modelling of an impact damper

Vinayaravi, R.; Kumaresan, D.; Jayaraj, K.; Asraff, A. K.; Muthukumar, R.

doi:10.1016/j.jsv.2012.10.032

Cited by 33 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1 shows the decay of the amplitude of a spring's oscillation with an attached granular damper. Similar figures can be found in many publications on granular damping [15,[18][19][20][21][22][23][24][25][26][27][28][29][30] which have three characteristic features in common: (a) for large amplitude, the decay follows an almost linear function of time; (b) for small amplitude (large time) the decay is weak and (c) there is a rather sharp transition between both regimes. In our case, the figure shows the attenuation of a flat spring where the granular damper is a rectangular polycarbonate container of mass M = 434 g and length L = 4 cm in the direction of vibration and cross section 5 × 5 cm 2 , mounted on top of a flat spring (k = 24.4 Nm −1 ) and loaded with 37 steel balls (diameter 1 cm, total mass m = 149 g).…”

Section: Introductionsupporting

confidence: 87%

See 1 more Smart Citation

Relaxation of a spring with an attached granular damper

et al. 2013

View full text Add to dashboard Cite

show abstract

Section: Introductionsupporting

confidence: 87%

“…Two regimes are separated by a rather sharp transition at time t * ≈ 11 s. The linear decay (dashed line) for t < t * was reported in many publications, e.g. [15,[18][19][20][21][22][23][24][25][26][27][28][29][30]. These lines were stacked-up to give an image of the flow of granulate during the oscillatory motion.…”

Section: Modes Of Excitationmentioning

confidence: 59%

Relaxation of a spring with an attached granular damper

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Ekwaro-Osire et al [11], compared the damping properties of single mass IVA with compound IVA and concentrated on the influence of system parameters on the efficiency of the compound IVA. Vinayaravi et al [12], proposed details of the velocity response for an IVA using the mathematical model which undergoes momentum transfer. Experiments are also carried out on a cantilever beam with IVA and the findings are compared with the theoretical results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling and Experimental Investigation of a Single and a Compound Pendulum Impact Dynamic Vibration Absorbers

Younes

2017

International Conference on Aerospace Sciences and Aviation Tec

View full text Add to dashboard Cite

This paper deals with vibration reduction of a mechanical vibrating system using passive impact vibration absorber (IVA). The damping potentials of a single mass IVA (SIVA) and a compound pendulum IVA (PIVA) are studied. The numerical and the experimental investigations are carried in free vibration modes. The influence of the IVA's configuration parameters such as the mass ratio, restitution coefficient, clearance, and the pendulum length on the vibration reduction for the main system were studied. A single degree of freedom (SDOF) oscillator equipped with a PIVA is designed and fabricated to conduct the experimental tests. The results show that the efficiency of the IVA depends mostly on the number of effective collisions rather than the aggregate number of impacts. The IVA's clearance and the mass ratio are important design parameters for the SIVA. In addition, to the pendulum length for the PIVA. A good combination of these design parameters accomplishes the higher vibration suppression capacity. The results demonstrate that it is recommended to take the IVA's mass ratio lying around 0.1. In addition, low or high values of the restitution coefficient do not improve the damping capacity. Moreover, it is recommended to select the relative clearance between 0.4 and 0.6 for the SIVA and between 1.3 to 1.5 with frequency ratio around 0.4 for the PIVA to maximize damping. The PIVA with suitable parameters can attenuate vibrations much better than SIVA by about 50%.

show abstract

“…Impact dampers consisting of an impact body and an outer case have been studied and used as vibration control devices for machines and structures . Impact dampers suppress vibrations by dissipating the energy acquired by repetitive collisions of the impact body with the outer case.…”

Section: Introductionmentioning

confidence: 99%

Effects of balanced impact damper in structures subjected to walking and vertical seismic excitations

Nakamura

Watanabe

2015

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Summary This study investigates whether a balanced impact damper (BID) with a vertically suspended impact body colliding with shock absorbing rubber can suppress vibrations of a floor slab subjected to walking and vertical seismic excitations. The impact body is suspended by coil springs to sustain its deadweight and centralize it within the gap, and collides with the stopper when its amplitude exceeds the specified gap width. The stopper is covered by a shock‐absorbing rubber made of polyurethane gel. The installed BID was evaluated in a single degree‐of‐freedom model of a floor slab subjected to vertical excitations. Simulations revealed that the installed BID properly controls the vibrations. Next, the effects of the BID installed on a steel plate were investigated in shaking table tests. The BID effectively suppressed vertical vibrations of the plate subjected to sinusoidal waves, seismic motions, and walking excitations. In addition, the shaking table tests were accurately simulated by the developed mathematical model of the damper. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Experimental investigation and theoretical modelling of an impact damper

Cited by 33 publications

References 15 publications

Relaxation of a spring with an attached granular damper

Relaxation of a spring with an attached granular damper

Numerical Modelling and Experimental Investigation of a Single and a Compound Pendulum Impact Dynamic Vibration Absorbers

Effects of balanced impact damper in structures subjected to walking and vertical seismic excitations

Contact Info

Product

Resources

About