On active vibration isolation of floating raft system

Niu, Junchuan; Song, Kaidi; Lim, C.W.

doi:10.1016/j.jsv.2004.08.013

Cited by 77 publications

(49 citation statements)

References 16 publications

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“…Singh [30] examined some common vibration isolation measures and showed the close relationship between structural noise emission and the transmitted power. Many authors have adopted power minimization as the control strategy for active isolation system and semiactive isolation system [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Vibratory Power Flow Analysis of a Gear‐Housing‐Foundation Coupled System

Ren

Chang

Liu

et al. 2018

Shock and Vibration

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The marine gearbox is usually installed on a vibration isolation system in order to reduce oscillation transmitted to the ship foundation. However, researches on vibration transmission in the gear-housing system and isolation system are currently independent. With the increasing requirement of lower vibration, a coupled model needs to be built to control the vibration propagation from a view of the whole system. Considering the mesh transmission error excitation of a gear pair, a flexible gearhousing-foundation coupled impedance model is constructed in this paper, and the vibratory power flow of the whole system is calculated. Power transmissions between three different gearbox installation configurations, that is, rigid installation, singlestage isolation, and double-stage isolation, are compared. Taking the single-stage isolation configuration as an example, parameter influences on the vibration of the foundation are studied. Results show that double-stage isolation can achieve lower vibration than single-stage isolation; decrease in bearing stiffness or Young's modulus of isolator will yield better vibration isolation performance; housing damping and isolator damping are beneficial to vibration reduction.

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Section: Introductionmentioning

confidence: 99%

Vibratory Power Flow Analysis of a Gear‐Housing‐Foundation Coupled System

Ren

Chang

Liu

et al. 2018

Shock and Vibration

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“…Since vibrations are transmitting from the sources to where sensors are located through various mechanical structures, measured vibration signals are the mixture of all the vibration sources. Therefore, many researchers have devoted to analyzing different mechanical structures such as beams [9], girders [10], rafts [11], casings [12], panels [13], and plates/shells [14][15][16] to identify vibration transmission characteristics. All of these researchers focused on evaluating mechanical infiuences of transmission structures.…”

Section: Introductionmentioning

confidence: 99%

Source Contribution Evaluation of Mechanical Vibration Signals via Enhanced Independent Component Analysis

Cheng

Zhang

Lee

et al. 2012

Journal of Manufacturing Science and Engineering

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Extraction of effective information from measured vibration signals is a fundamental task for the machinery condition monitoring and fault diagnosis. As a typicai blind source separation (BSS) method, independent component analysis (ICA) is known to be abie to effectively extract the latent information in complex signals even when the mixing mode and sources are unknown. In this paper, we propose a novel approach to overcome two major drawbacks of the traditional ICA algorithm: lack of robustness and source contribution evaluation. The enhanced ICA algorithm is established to escalate the separation performance and robustness of ICA algorithm. This algorithm repeatedly separates the mixed signals multiple times with different initial parameters and evaluates the optimal separated components by the clustering evaluation method. Furthermore, the source contributions to the mixed signals can also be evaluated. The effectiveness of the proposed method is validated through the numerical simulation and experiment studies.

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“…One basic method to reduce the radiated noise is based on improving the hull structure to reduce vibration transmission. In the past decades, much research work is devoted to vibration transmission characteristic analysis of different structures, such as beams (Lee et al, 2007), girders (Senjanovic et al, 2009), rafts (Niu et al, 2005), casings (Otrin et al, 2005), panels (Lee et al, 2009), plates (Xie et al, 2007;Bonfiglio et al, 2007) and shells (Efimtsov & Lazarev, 2009). Some studies dedicated to the responses of whole ship hull, such as free vibration analysis of thin shell (Lee, 2006), insertion loss prediction of floating floors (Cha & Chun, 2008) and structural responses of ship hull (Iijima et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies dedicated to the responses of whole ship hull, such as free vibration analysis of thin shell (Lee, 2006), insertion loss prediction of floating floors (Cha & Chun, 2008) and structural responses of ship hull (Iijima et al, 2008). Another method based on the active control over vibration and noise is also deeply studied in recent years, such as controlling high frequencies of vibration signals by structure modification (Tian et al, 2009), active vibration control using delayed position feedback method (Jnifene, 2007), high frequency spatial vibration control for complex structures (Barrault et al, 2008), and active vibration isolation of floating raft system (Niu, et al, 2005). However, all these techniques are static analysis method, and the radiated noise can be reduced limitedly as the strength requirements of hulls and indispensability of diesel engines.…”

Section: Introductionmentioning

confidence: 99%