Unbalanced machinery vibration isolation with a semi-active pneumatic suspension

Nieto, A.J.; Morales, A.L.; Chicharro, J.M.; Pintado, P.

doi:10.1016/j.jsv.2009.09.001

Cited by 24 publications

(16 citation statements)

References 13 publications

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“…15 Vibrations isolation with a semi-active pneumatic damping was also presented. 16 Auto-balancing using speed dependent vibration absorbers was also investigated. 17 Radial magnetic force was used for shaft vibration suppression to go through the first critical speed.…”

Section: Introductionmentioning

confidence: 99%

Model-Based Algebraic Approach to Robust Parameter Estimation in Uncertain Dynamics Rotating Machinery

Peláez¹,

Izquierdo²,

Rubio³

et al. 2017

IJAV

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This work presents a model-based algebraic approach to robust parameter estimation in uncertain dynamics rotating machinery. The approach evades some mathematical intricacies of the traditional stochastic methods, proposing an affordable Jeffcott-model-based scheme with several easy-to-implement computational advantages for processing a real-world rotor frequency response or orbit. Therefore, it takes out the dynamic parameters from one of the orbit's resonant humps when the multistage rotor orbit shape behaves closely to the Jeffcott-model orbit. This occurs for a valuable array of cases. The approach applies the spatial 2-norm looking forward to the correlation between the analytical Jeffcott-orbit model and the experimental rotor's orbit hump, handling the normalized frequency ratio. Experimental results are also included to face this method with real-world rotating machinery orbits.

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Section: Introductionmentioning

confidence: 99%

Model-Based Algebraic Approach to Robust Parameter Estimation in Uncertain Dynamics Rotating Machinery

Peláez¹,

Izquierdo²,

Rubio³

et al. 2017

IJAV

View full text Add to dashboard Cite

show abstract

“…It uses the fact that the transfer function of a pneumatic suspension, comprising an air-spring, auxiliary tank and several connecting pipes, can be modified simply by routing the air flow through the desired pipe. The advantages have been demonstrated for several inputs and applications (Nieto et al., 2008, 2010, 2011; Morales et al., 2015). It is clear that passive configurations are not usually appropriate when different types of disturbances are to be filtered or when different goals are to be achieved.…”

Section: Introductionmentioning

confidence: 99%

A semi-active vehicle suspension based on pneumatic springs and magnetorheological dampers

Morales

Nieto

Chicharro

et al. 2016

Journal of Vibration and Control

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Semi-active and active suspensions can improve both ride comfort and handling compared to passive suspensions. The authors have proposed a suspension comprising a pneumatic system capable of changing the stiffness of the suspension and a semi-active magnetorheological damper capable of controlling the suspension damping. Eight configurations of this magnetorheological/pneumatic suspension result from combining two possible stiffnesses (compliant and stiff) and four possible means of producing damping (constant low, constant high, on-off skyhook control and on-off balance control). The minimization of a cost function, which considers both ride comfort and handling, leads to decision maps which indicate the most appropriate configuration depending on vehicle velocity and two pieces of information about the road: the international roughness index and the curve radius. All this information can be gathered from a GPS system and toggling between set-ups is fast, efficient, and easily done by simply opening or closing pipes in the pneumatic system and modifying the current supply in the magnetorheological dampers. The proposed magnetorheological/pneumatic suspension achieves the same roll angle levels as in a comparable passive vehicle while improving ride comfort by reducing acceleration by up to 30%.

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“…Previous studies have mainly focused on isolating the random vibrations of the base. But base periodical vibration disturbance always exists in reality, considering unbalanced rotating masses, widely seen in applications like air compressors, freeze drying machines and air conditioners, as the usual source of undesirable vibrations (Nieto et al, 2010). In some cases, the influence of periodic disturbance is non-negligible, for the frequency of the disturbance is far from resonance frequency, causing the feedback control to be ineffective.…”

Section: Introductionmentioning

confidence: 99%

Feedforward compensation in vibration isolation system subject to base disturbance

Zhou

Chen

Zhang

2013

Journal of Vibration and Control

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Skyhook technology is widely used in vibration control. However, it only attenuates vibration near the resonant frequency. To enhance the control performance of an isolation system, a new feedforward compensation control strategy, achieved by measuring base velocity with a geophone, is proposed in this paper. Firstly, the mathematical model of single degree-of-freedom pneumatic spring is derived in detail. Secondly, the feedback controller is designed experimentally, and an anti-windup proportion-integral controller is used. Thirdly, the feedforward compensation controller is designed using a finite impulse response filter, whose coefficients are updated on-line using the filtered-x least-mean-square algorithm with improved gradient estimate. At last, a series of experiments were conducted, and the velocity attenuation rate is calculated. The results of these experiments prove that the proposed method can greatly reduce base disturbance, and keep a high vibration velocity attenuation rate at all frequency points.

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Unbalanced machinery vibration isolation with a semi-active pneumatic suspension

Cited by 24 publications

References 13 publications

Model-Based Algebraic Approach to Robust Parameter Estimation in Uncertain Dynamics Rotating Machinery

Model-Based Algebraic Approach to Robust Parameter Estimation in Uncertain Dynamics Rotating Machinery

A semi-active vehicle suspension based on pneumatic springs and magnetorheological dampers

Feedforward compensation in vibration isolation system subject to base disturbance

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