Elastodynamic analysis of a gear pump. Part I: Pressure distribution and gear eccentricity

Mucchi, Emiliano; Dalpiaz, Giorgio; Rincón, Alfonso Fernández del

doi:10.1016/j.ymssp.2010.02.003

Cited by 66 publications

(44 citation statements)

References 7 publications

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“…An incremental improvement in the requirements in terms of Operating Conditions (OC) and efficiency for gear transmissions is foreseen in the near future [13,17]. A greater transmitted torque from the pinion to the driven gear is needed with an increase in spin speed.…”

Section: Introductionmentioning

confidence: 99%

Efficiency analysis of spur gears with a shifting profile

et al. 2015

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A model for the assessment of the energy efficiency of spur gears is presented in this study, which considers a shifting profile under different operating conditions (40 -600 Nm and 1500 -6000 rpm). Three factors affect the power losses resulting from friction forces in a lubricated spur gear pair, namely, the friction coefficient, sliding velocity and load sharing ratio. Friction forces were implemented using a Coulomb ′ s model with a constant friction coefficient which is the wellknown Niemann formulation. Three different scenarios were developed to assess the effect of the shifting profile on the efficiency under different operating conditions. The first kept the exterior radii constant, the second maintained the theoretical contact ratio whilst in the third the exterior radii is defined by the shifting coefficient. The numerical results were compared with a traditional approach to assess the results.

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Section: Introductionmentioning

confidence: 99%

Efficiency analysis of spur gears with a shifting profile

et al. 2015

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“…While some works focus on reducing internal sources of SBN [2], the main focus in most research on noise in hydraulic pumps is on reducing the magnitude of the pressure ripple oscillations at the outlet port [3][4][5][6][7][8]. For EGMs, this effort has resulted in the formulation of design solutions that involve tooth profile modifications able to reduce the kinematic flow oscillations: Manring and Huang formulated criteria suitable for standard involute designs [6,9]; Negrini introduced the so-called dual-flank principle, a zero-backlash solution currently adopted by several manufacturers that permits to increase the number of displacement chambers [4] to reduce the flow oscillations.…”

Section: Introductionmentioning

confidence: 99%

“…Most recent efforts involved the research of non-standard gear profiles-such as asymmetric [10,11], cycloidal-involute [12][13][14][15] able to minimize the kinematic flow oscillations associated with the meshing of the gears. The effects of fluid compressibility on the outlet flow oscillations in EGMs was considered by several researchers, such as Mucchi [5], Casoli et al [16], Borghi et al [17], and criteria for minimizing their impact on the flow oscillations through design optimization of recesses facing the gear in the meshing area were provided in several studies, such as [18][19][20]. The source impedance method to characterize FBN through outlet flow oscillations, introduced by Edge et al [21], was also recently used for EGMs [22].…”

Section: Introductionmentioning

confidence: 99%

Modeling Noise Sources and Propagation in External Gear Pumps

et al. 2017

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As a key component in power transfer, positive displacement machines often represent the major source of noise in hydraulic systems. Thus, investigation into the sources of noise and discovering strategies to reduce noise is a key part of improving the performance of current hydraulic systems, as well as applying fluid power systems to a wider range of applications. The present work aims at developing modeling techniques on the topic of noise generation caused by external gear pumps for high pressure applications, which can be useful and effective in investigating the interaction between noise sources and radiated noise and establishing the design guide for a quiet pump. In particular, this study classifies the internal noise sources into four types of effective load functions and, in the proposed model, these load functions are applied to the corresponding areas of the pump case in a realistic way. Vibration and sound radiation can then be predicted using a combined finite element and boundary element vibro-acoustic model. The radiated sound power and sound pressure for the different operating conditions are presented as the main outcomes of the acoustic model. The noise prediction was validated through comparison with the experimentally measured sound power levels.

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“…Currently, a wide variety of gear pump and engine designs provide improvement of hydraulic and acoustic properties, the description of which can be found in the literature [2,7,15,17,19,20,21,22]. The development of modern gear units is associated with the following trends: increasing operating pressure [6,18], improving total efficiency [4,10,15,18,23], reducing pressure pulsations [3,18,25], minimizing weight [15] and noise [11,14,16], and reducing dynamic loads [7,12,13,19]. Introducing certain modifications to the pump design and searching for the optimal design is possible through the use of modern computer aided design (CAD) techniques and numerical methods [5,7,8,9,14,24].…”

Section: Introductionmentioning

confidence: 99%