Passive Vibration Isolation

“…This goal is unattainable through common use of accepted concepts consisting in practice of heavy fluid dampers with passive, semi-active and active controls (Rivin, 2003;Sun et al, 1995;Herzog, 1995). At the same, this goal is theoretically possible if the natural frequencies, f 0 , of a vibration isolating system are shifted below the frequencies of external excitation, i.e., if f 0 < f. This can be achieved by extreme reduction stiffness for the system *Corresponding author.…”

Section: Motivation For Development Of the Approach To Suspension Designmentioning

confidence: 99%

“…Furthermore the motion of such kinds of suspensions is chaotic , showing inevitable unpredictable behavior of the FGMs. Generally, this empiricism is one of the main obstacles to full exploitation of the practical merit of the "negative" stiffness concept as mentioned in (Rivin, 2003).…”

Section: Introductionmentioning

confidence: 99%

Type synthesis of function-generating mechanisms for seat suspensions

Lee

Goverdovskiy

2009

Int.J Automot. Technol.

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Mechanisms with "negative" stiffness are a unique tool used to significantly improve vibration isolation for a vehicle driver via upgrade of the seat suspension. However, connection of such mechanisms to the suspension results in errors in the function generation process, and in most cases, makes motion impossible. An approach to type synthesis is presented in order to make this process more predictable, easy and thus more practical for the upgrade process. Structural classification of the suspensions is presented, and -an atlas of function-generating mechanisms for suspensions that reveals the effect of "negative" stiffness is completed. All of the function-generating mechanisms appear in the atlas as result of enumeration. Structural properties of novel and existing mechanisms are compared. Finally, some advantages in practical use of novel suspensions with "negative" stiffness are illustrated.

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“…Up to now, there are a number of strategies to control the response of a system such as passive control, active control, semi-active control and hybrid control [2][3][4][5][6]. To achieve perfect performance of a target system, the structures or mechanical systems should be designed to suit different types of loading, such as particularly dynamic and transient loads, and to obtain high static stiffness resulting in a small static deflection and a small dynamic stiffness resulting in a low natural frequency [7,8].…”

Section: Introductionmentioning

confidence: 99%

Periodic solution and bifurcation of a suspension vibration system by incremental harmonic balance and continuation method

Chen

2015

Nonlinear Dyn

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A compressed air generator hang under vehicle is simplified as a suspension mass connected to a vertical spring and two horizontal springs. It is configured generally as a geometrical negative stiffness to reduce dynamic stiffness. The periodic motion, chaotic motion and bifurcation of the compressed air generator model are investigated using the incremental harmonic balance method in combination with arc length continuation technique. The stability and bifurcation route are also distinguished with Floquet theory. The system exhibits a period doubling bifurcation route to chaos in different regions of excitation frequency. The stiffness ratio of the vertical spring and the horizontal spring has a significant influence on the dynamic response. When the vertical stiffness is close to the stiffness at horizontal direction, resonance occurs with the emergence of the chaotic motion. The dynamic response of the vibration system can be improved by reducing the stiffness in the horizontal direction to increase the stiffness ratio. L. Yuanping Key Lab of Disaster Forecast and Control in Engineering, Ministry of Education of the People'

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Passive Vibration Isolation

Cited by 223 publications

References 0 publications

On the Stress Distribution in Slotted Cylinder Springs

On the Stress Distribution in Slotted Cylinder Springs

Type synthesis of function-generating mechanisms for seat suspensions

Periodic solution and bifurcation of a suspension vibration system by incremental harmonic balance and continuation method

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