The influence of bearing stiffness on the vibration properties of statically overdetermined gearboxes

Razpotnik, Matej; Bischof, Th.; Boltežar, Miha

doi:10.1016/j.jsv.2015.04.021

Cited by 19 publications

(8 citation statements)

References 20 publications

(23 reference statements)

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“…The basic methodology, which consist from three different level of complexity was also evaluated by corresponded technical experiment. The methodology enables to include oil behavior, the influence of contact behavior, unbalance, backlash, torque value and transmission error, which is used in several approaches [3,4]. The software Ansys was used for modal and harmonic analysis.…”

Section: Methodsmentioning

confidence: 99%

Gear shift simulation by using virtual prototype

Prokop¹,

Řehák²

2019

Vib. proced.

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The presented paper is focused on the simulation of gear shift and prediction of whole gearbox dynamic behavior during gear shift. For this complex task the methodology for simplified gearbox was developed first. The whole methodology is divided into three different level of numerical model, where each of them was developed and validated by technical experiment. Afterwards the methodology was applied on more complex gearboxes, in presented case the heavy-duty gearbox concept. The virtual prototype was extended by gear shift option. The numerical sensitivity study of different gear shift time, which are simulated by different clutch activation and deactivation, was performed and the surface normal velocity and torque were evaluated and compared. The simulation was performed to find the optimal gear shift progress with minimal affects vehicle comfort. For this purpose, the surface normal velocity is evaluated, which is directly connected to emitted noise of whole gearbox.

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Section: Methodsmentioning

confidence: 99%

Gear shift simulation by using virtual prototype

Prokop¹,

Řehák²

2019

Vib. proced.

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“…where Substituting equations (16) and (17) into equation (15) and separating sine and cosine parts yields the following…”

Section: Identification Of Dynamic Coefficients Of Journal Bearing Momentioning

confidence: 99%

“…[12][13][14] The high-speed hydrostatic bearing is also used in the motorized spindle to achieve a higher stiffness and a lower power consumption. 15 In addition, numerous methods have been proposed to identify the dynamic coefficients of the journal bearing in the rotating spindle system, for example, the impact excitation method, 16,17 the harmonic excitation method, 18,19 and the unbalance excitation method. 20,21 However, the above identification methods need a specialized test rig to acquire experimental data under various testing conditions, which is complicated and expensive.…”

Section: Introductionmentioning

confidence: 99%

Identification of dynamic coefficients of the journal bearing considering velocity slip of cavitation zone in the rotating spindle unit

Cheng

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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A rotating spindle unit, supported by the journal bearings, is developed to improve the cavitation erosion resistance of the journal bearing as well as the spindle dynamic performance. The turbulent lubrication model considering velocity slip in cavitation zone is derived, and the static and dynamic parameters of the journal bearing are obtained. An identification algorithm is further derivated to identify simultaneously the 16 dynamic coefficients of the two journal bearings in the spindle unit. The available experimental results reveal that the journal bearing coefficients are well predicted and estimated by the present model, and the estimated bearing parameters by regularization solution are in good agreement with the assumed values, while it has opposite effect by directed solution for discrete ill-posed problems. It is concluded that the identification accuracy of bearing parameters is governed by the displacement error, and the percentage deviation of dynamic coefficients decreases with the decrease of the displacement error.

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“…Vibroactivity of the transmission is an important topic of numerous scientific papers and experimental studies. As shown in (Åkerblom and Sellgren, 2008;Dogruer and Pirsoltan, 2017;Grega et al, 2016;Łazarz and Peruń, 2012;Razpotnik et al, 2015;Wieczorek, 2010;Wojnar, 2010), vibration and noise levels limits are searched for, among other things, in the appropriate selection of construction factors, bearing stiffness and preload, couplings, lubricant types and its operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Non-Parallelism of Toothed Gear Shafts Axes and Method of Gear Fixing on Gearbox Components Vibrations

Wojnar

Juzek

2018

Acta Mechanica Et Automatica

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The subject of the experimental research was a modified back-to-back test stand. During the test, the driven gear with a number of teeth z1=16 was fixed on stationary axis. The tested gearbox worked without load and the closing gearbox was dismantled to avoid any additional vibration and noise. A mechanical system was also used which, during the tests, allowed to change the position of the above mentioned stationary axis. Gear with number of teeth z1 was fixed on a stationary axis with the arrangement of two self-aligning ball bear-ings which prevented significant changes in the angular position of axis of gear in regard of stationary axis; or fixed on a stationary axis with the arrangement of one self-aligning ball bearing which allowed significant changes in the angular position of axis of gear in regard of stationary axis. On the basis of the conducted studies, it can be stated that only in some of the analyzed cases fixing of gear with the arrangement of one self-aligning ball bearing reduces the vibration of the gearbox elements.

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The influence of bearing stiffness on the vibration properties of statically overdetermined gearboxes

Cited by 19 publications

References 20 publications

Gear shift simulation by using virtual prototype

Gear shift simulation by using virtual prototype

Identification of dynamic coefficients of the journal bearing considering velocity slip of cavitation zone in the rotating spindle unit

The Impact of Non-Parallelism of Toothed Gear Shafts Axes and Method of Gear Fixing on Gearbox Components Vibrations

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