Influence of both friction and wear on the vibration of marine water lubricated rubber bearing

Wang, Huanjie; Liu, Zhenglin; Zou, Li; Yang, Jun

doi:10.1016/j.wear.2017.02.006

Cited by 87 publications

(46 citation statements)

References 9 publications

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“…It can be seen from the Eq. (4) that if c' 2 = (q p + c 2 / W) × W / m 2 < 0, namely q p + c 2 / W < 0, q p < ₋c 2 / W, so the slope q p at point p of the curve is negative, the frictional selfexcited vibration might be triggered [23]. It indicates that the slope is related to the damping c 2 and applied load W, particularly, the damping is susceptible to temperature.…”

Section: Friction Coefficient Discussionmentioning

confidence: 99%

“…9, 10 that the vibration amplitude in 0 ~ 2 kHz frequency band is the harmonic response one resulted from the supporting bearings (3,5,10), test bearing, bearing pedestal and hydraulic loading cylinder, etc. under different testing conditions [23]. Under above condition, as soon as operating speed of the tested shaft is higher than the corresponding critical speed in Table 4, the water film thickness between both bearing and shaft is increases and the lubricating performance of the bearing is obviously improved so that friction-induced self-excited vibration isn't easy to bring about.…”

Section: Effect Of Specific Pressure On Friction Vibrationmentioning

confidence: 99%

“…Even so, the reports on the friction vibration and noise of the water-lubricated rubber bearing on surface vessels are few, particularly one of underwater vehicle. Although the rubber bearings is of excellent anti-vibration and noise reduction nature, but under the condition of low speed and heavy loading, the lubrication status of the rubber bearing is bad, friction resistance increases, and friction vibration and noise is prone to bring about, affecting the mute level of vessels, especially the survivability and security of underwater vehicle [22][23][24]. This paper concerns with the friction-induced self-excited vibration of marine water-lubricated bearing, and mainly discusses the tribological performances, friction-induced self-excited vibration and their influence factors of marine water-lubricated rubber stern bearing in order to improve the friction characteristic and inhibit the friction vibration and noise of the water-lubricated rubber bearing.…”

Section: Introductionmentioning

confidence: 99%

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Research on Friction Vibration of Marine Water Lubricated Rubber Bearing

et al. 2018

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Marine water-lubricated rubber bearing is used to support the stern shaft of surface vessels and underwater vehicles, whose friction vibration and noise directly influence the stealth, security of the vessels and both physical and psychological health of occupants. In order to investigate the this problem, the kinds of water-lubricated bearings with different rubber material were tested on the bearing testing machine, and friction coefficient, noise, vibration frequency and amplitude were measured under different working conditions. The results show that friction coefficient of water-lubricated rubber bearings are affected with the rubber material, operating speed, applied load and cooling water temperature, which results in the change of bearing vibration state. The component content of carbon black and self-lubricated materials can affect the deformation size, frictional performances and friction coefficients of bearings. The higher the speed, the smaller the friction coefficient, and friction vibration state is changed. With the increase of the specific pressure in some range, the contact pressure between tested bearing and shaft decreases due to the augment of the contact area so that the friction coefficient and vibration amplitude are changed. As cooling water temperature is enhanced, sometimes friction vibration declines, but the critical speed producing noise increases due to softened rubber.

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Section: Friction Coefficient Discussionmentioning

confidence: 99%

Section: Effect Of Specific Pressure On Friction Vibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on Friction Vibration of Marine Water Lubricated Rubber Bearing

et al. 2018

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“…The mechanism of water lubrication has attracted considerable attention from researchers [10]. In some applications, such as mechanical seals, bearings of canned pumps and marine power systems, rubber friction pairs are operated in an aqueous medium, in which water is used as a lubricant directly [11,12]. When NBR materials are applied in the machinery which operates in the presence of the abrasive slurries, the slurry will lead to the wear of rubbers thereby causing the machine failure [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…In marine systems such as marine propeller shaft systems, rubbers are commonly used as bearing materials [15]. Wang et al [16] discussed the tribological properties of water-lubricated rubber bearing. The results showed that the friction coefficient and wear are affected by the different rotary speed, load and cooling water temperature, which can further result in the change of the bearing vibration status.…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of swollen nitrile rubber under dry and wet sliding conditions

Song

Nie

Wang

et al. 2019

Mater. Res. Express

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When nitrile rubber contacting with water under the external force during the service life, swelling and sliding wear occur. Since nitrile has similar polarity to water, the interaction between water and nitrile rubber and its influence on mechanical and tribological behaviors of the nitrile rubber play an important role in rubber performance, which is extremely necessary to be studied systematically. In this study, immersion experiments were conducted on three nitrile rubber samples which contained different acrylonitrile weight percentages of 18%, 26% and 41% (i.e. N18, N26, and N41) respectively. The hardness, tensile, dry and wet unidirectional sliding wear tests were further conducted. To reveal the mechanisms, the nuclear magnetic resonance (NMR) analysis and scanning electron microscopy (SEM) analysis were performed and interpreted accordingly. The results showed that cross-linking break based structural damage, substance dissolution and surface layer defects occurred after swelling, resulting in decreases in hardness and tensile strength and increases in permanent deformation fracture rates of the nitrile rubbers. The friction coefficient value of the un-swollen NBRs was positively related to the wear loss and decreased with the increase of the acrylonitrile content. During the wear process under dry conditions, the un-swollen rubbers presented hardening in aging while the swollen samples softened along with the deterioration of adhesive wear with higher steady-state friction coefficient value and wear loss. Under wet friction conditions, the susceptible wear behavior of the swollen rubbers induced reductions in friction coefficient and increases in wear loss. The swelling degree and its effects on mechanical and tribological behavior decreased with the increase of the acrylonitrile content. The swelling influences on the tribological behavior of nitrile rubber affected and acted on the entire wear process.

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Improved tribological and noise suppression performance of graphene/nitrile butadiene rubber composites via the exfoliation effect of ionic liquid on graphene

Xue

Zhang

et al. 2020

J of Applied Polymer Sci

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Minimization and suppression of friction and noise in underwater bearings remains a key aspect in modern marine vehicle industry owing to the growing need for reliability, and passenger comfort. In this study, graphene nano‐flake (Gr) was introduced into the nitrile butadiene rubber (NBR) with assistance of ionic liquid (IL). Owing to the positive charge generated by the secondary ordering layer on the Gr surface, Gr were effectively exfoliate into few layers and uniformly dispersed in the NBR matrix. Accordingly, the friction coefficient and volume wear rate decreased to 0.3124 and 6.44 × 10−6 mm3·N−1·m−1 in the nanocomposite, depicting a 31.52% and 51.9% reduction than pure NBR. It was demonstrated that the reinforced hardness and the formation of tribological layer of Gr played a vital role in the lubricating mechanism where both deformation and the continuation of the stick–slip effect were prevented. As a proof of concept, the total vibration acceleration level of the NBR/GR‐IL composite decreased from 111.37 ± 5.57 dB to 79.68 ± 3.98 dB, exhibiting good noise and vibration suppression effect. This work not only broadens the application of GR‐based materials, but also shed some light on the designing philosophy to improve the efficiency, service life and safety of the future marine vehicles.

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Influence of both friction and wear on the vibration of marine water lubricated rubber bearing

Cited by 87 publications

References 9 publications

Research on Friction Vibration of Marine Water Lubricated Rubber Bearing

Research on Friction Vibration of Marine Water Lubricated Rubber Bearing

Tribological properties of swollen nitrile rubber under dry and wet sliding conditions

Improved tribological and noise suppression performance of graphene/nitrile butadiene rubber composites via the exfoliation effect of ionic liquid on graphene

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