Semi-active force generators for shock isolation

Alanoly, James; Sankar, S.

doi:10.1016/0022-460x(88)90404-x

Cited by 28 publications

(9 citation statements)

References 6 publications

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“…There are two types of active vibration suppression control methods to avoid the abovementioned difficulty. One is the skyhook control method [5][6][7][8][9][10] and the other is the multiple-degree-of-freedom (MDOF) approach [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…In the skyhook control method, the system is converted by feedback into a system where the sprung mass is hooked to a rigid ceiling by a virtual damper, and ideal control performance is realized. However, this method assumes the use of an absolute velocity with respect to a fixed point that is not affected by floor vibration . In many cases, it is difficult to obtain precise information on the absolute displacement or velocity without expensive sensors.…”

Section: Introductionmentioning

confidence: 99%

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Vibration suppression for mass‐spring‐damper systems with a tuned mass damper using interconnection and damping assignment passivity‐based control

Aoki

Yamashita

Tsubakino

2015

Intl J Robust & Nonlinear

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SUMMARYThis paper considers a vibration suppression control method using feedback for a mass-spring-damper system with a tuned mass damper. For vibration suppression, we adopt the interconnection and damping assignment passivity-based control, whereby the system is transformed to a system with a skyhook damper with an artificial structure matrix. The feedback law includes no accelerometer signal and uses only information on relative displacements and velocities. The proposed control method can simultaneously suppress the influences of the floor vibration and the disturbance force acting on the main body. A guideline for choosing parameters of the desired system is shown. The proposed method can be easily extended to nonlinear cases, which is demonstrated for a nonlinear-spring case. We also show the input-to-state stability property of closed-loop systems for linear cases and nonlinear cases.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration suppression for mass‐spring‐damper systems with a tuned mass damper using interconnection and damping assignment passivity‐based control

Aoki

Yamashita

Tsubakino

2015

Intl J Robust & Nonlinear

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“…Though the isolation performance can be improved with activesuspension mechanism, it comes with a heavy penalty in terms of power and cost. With an objective to improve the isolation with marginal increase in cost, the concept of semi-active suspension is proposed in literature [6,7,8,9,10,11,12,13,14,15,16] wherein, the damping coefficient is variable. The variation of damping coefficient can be achieved with a very low power and literature suggests that substantial improvement in the isolation performance can be achieved with this.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of semi-active suspension system largely depends on the way the damping coefficient is varied. One of the popular strategies for varying the damper is the Sky-Hook control logic [6,11,13,4,14]. A hypothetical hook is hanged in the sky and this hook is tied to the chassis through the damper.…”

Section: Introductionmentioning

confidence: 99%

A conditional-proportional damper schedule for semi-active suspension of ground vehicles

Srinivasan

Senthilkumar

Basha

2015

2015 International Conference on Smart Technologies and Management for Computing, Communication, Controls, Energy and Materials

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The suspension system of a ground vehicle is responsible for ride comfort and for isolation of the chassis from the road disturbances. The performance of a suspension system can be quantitatively expressed by the root-meansquare acceleration experienced by the chassis under given terrain conditions. The suspension performance is crucial for ride comfort as well as the health of equipment and personnel on-board the chassis. Typically some variant of springdamper system is used for ground vehicle suspension. The spring deforms to the road undulations and the role of the damper is to attenuate the oscillations induced by the spring and suspended mass. Extremely low level of damping makes the suspension system prone to resonance phenomenon which can be hazardous to the chassis. On the other hand, an extremely high level of damping substantially reduces the effectiveness of the spring, thereby drastically reducing the performance of the suspension system. Adaptively varying the damping coefficient based on certain kinematic conditions has been a subject matter of interest because of the performance improvement that can be achieved with inexpensive hardware. Such suspension systems are said to be Semi-active. Several strategies for adjusting the damper for improving the isolation performance are available in literature. Model reference skyhook strategy is one of the most popular techniques for scheduling the damping co-efficient. Unfortunately, it requires the absolute positions and velocities which are not easily measurable. An alternative strategy is available in literature which is based on easily measurable relative kinematics. In this paper, we show that this alternative strategy leads to performance degradation against the sky-hook strategy. Further, this paper proposes a novel strategy for scheduling the damper which is based on easily measurable quantities and at the same time achieves an isolation performance close to benchmark Sky-hook damper.

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“…The forces in the damper are generated by modulating its orifice for fluid flow and the performance of a damper is controlled via this modulation. Therefore, it can only dissipate or store energy (Alanoly and Sankar, 1988). The new technology enables a designer to propose a new control method for designing active suspensions with less expense and high quality performances and responses.…”

Section: Introductionmentioning

confidence: 99%