Shock isolation using an isolator with switchable stiffness

Ledezma-Ramírez, Diego Francisco; Ferguson, N.S.; Brennan, M.J.

doi:10.1016/j.jsv.2010.09.016

Cited by 50 publications

(34 citation statements)

References 12 publications

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“…3 T. P. Waters et al devised a dual rate damping strategy where the damping was reduced to a lower value, whilst a shock input was applied. 4 D. F. Ledezma et al studied the isolation of shock vibration using a variable stiffness system, 5 while application of variable damping system for shock vibration control was proposed by H. U. Oh and Y. J. Choi. 6 D. Francisco et al studied the transient vibration control strategy using a switchable mass stiffness compound.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Study of Momentum Exchange Impact Damper Using Pre-straining Spring Mechanism

Son¹,

Bur²,

Rusli³

et al. 2017

IJAV

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A shock load occurred in a short time duration can lead to dangerous effect on the machine or structure. The use of conventional technique for shock vibration control by modifying the systems damping reduces the steady-state response of the system. However, this method fails to attenuate a large acceleration peak at the moment after the shock. An alternative method for reducing the maximum acceleration peak due to shock load using the principle of momentum exchange has been developed. When the shock excitation frequency is much larger in comparison with the main mass natural frequency, the passive momentum exchange impact damper(PMEID) produces good performance. However, the performance of PMEID decreases as the shock excitation frequency close to the main mass natural frequency. In this research, a simple technique to improve the performance of PMEID utilizing the pre-straining spring mechanism (PSMEID) is proposed. The dynamic model of the system with PSMEID is derived. Next, the simulation is conducted to evaluate the effectiveness of the proposed method.

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Section: Introductionmentioning

confidence: 99%

Fundamental Study of Momentum Exchange Impact Damper Using Pre-straining Spring Mechanism

Son¹,

Bur²,

Rusli³

et al. 2017

IJAV

View full text Add to dashboard Cite

show abstract

“…Moreover, it is important to mention the recent increased interest in variable and nonlinear stiffness strategies for control and isolation of shock produced vibration, demonstrating the feasibility and isolation performance of low dynamic nonlinear stiffness for high-level excitations. [11][12][13] Apart from the study of Guzman-Nieto et al, 9 to the knowledge of the authors, there is no published study dealing with the shock response of wire rope isolators.…”

Section: Ikmalmentioning

confidence: 99%

Experimental characterisation of dry friction isolators for shock and vibration

Tapia-González

Ledezma-Ramírez

2017

Journal of Low Frequency Noise, Vibration and Active Control

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Shock and vibration are a source of failures in harsh environments such as military, naval and aerospace applications; thus, the use of vibration isolators is extended. Cable isolators are known for their high-energy storage and dissipation properties making them suitable for shock isolation and low frequency vibration. Such isolators present nonlinear stiffness in different directions such as compression, roll and shear, as well as dry friction damping. Although their use is extended, the knowledge regarding their dynamic response under shock loading is very limited. This work presents an overview of the vibration and shock isolation performance of several cable isolators under axial loading. The main contribution of the paper is to investigate and discuss the shock response of the isolators when subjected to pulses of different durations, finding improved isolation performance when compared to an equivalent linear system. Furthermore, a mathematical model based on a Duffing oscillator is proposed as a first approximation, in order to reflect the nonlinear stiffness and predict the shock response, thus facilitating further design and selection of improved shock isolation systems.

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“…This paper is a continuation of the work in [18], describing the practical realization of a semi-active shock isolation system. The main motivation in developing such strategies is to improve methods of shock isolation.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are no results or investigations related to shock response in these studies. The concept of switchable stiffness has been investigated theoretically, by the authors of this current paper, as a means of energy dissipation in lightly damped systems, where it is difficult to implement another form of external damping (see for example [18] and the references therein). This is effectively a semi-active control strategy.…”

Section: Introductionmentioning

confidence: 99%

“…This is effectively a semi-active control strategy. The model presented in [18] comprises a mass supported by two springs, one of which can be disconnected. Switching in and out of the spring involves a two-stage control strategy; stiffness control during the shock to reduce the maximum response of the payload, and reduction of the residual vibration after the shock has occurred.…”

Section: Introductionmentioning

confidence: 99%

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