A combined FEM/BEM model and experimental investigation into the effects of fluid-borne noise sources on the air-borne noise generated by hydraulic pumps and motors

Opperwall, Timothy; Vacca, Andrea

doi:10.1177/0954406213486591

Cited by 19 publications

(18 citation statements)

References 15 publications

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“…The model is validated by showing fairly good agreements with the experimentally measured SWLs. The past work done by the authors' research team [30] focused on the outlet pressure ripple among all possible noise sources, and partially confirmed the common assumption that outlet pressure ripple is the primary noise source is valid at some shaft speeds. However, the predicted ABN showed a large difference with the measured ABN.…”

Section: Vibro-acoustic Model Of External Gear Pumpsupporting

confidence: 54%

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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Section: Vibro-acoustic Model Of External Gear Pumpsupporting

confidence: 54%

Modeling Noise Sources and Propagation in External Gear Pumps

et al. 2017

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“…The vibroacoustic characteristics of axial piston pumps are difficult to be predicted due to the complexity of the generation and transmission of excitation forces in the pump. In order to model the vibroacoustic characteristics of the pump, a systematic methodology combining the lumped parameters, finite element, and boundary element models is presented in this study [3,4]. The model can be used to evaluate the excitation forces generated by the pump, the vibrations on the outer surface of different parts (mainly the housing and cover as shown in Figure 1), and the sound pressures at sound field points surrounding the pump at different operating conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Mucchi et al analyzed the dynamic behavior of an external gear pump using a lumped-parameter model [2]. Opperwal and Vacca investigated the effects of pump generated pressure ripple on the noise generation of an external gear pump numerically and experimentally [3]. A pump model was established to simulate the vibration and noise propagation from the gear pump by Mucchi et al [4].…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Lumped Parameters/Finite Element/Boundary Element Model to Predict the Vibroacoustic Characteristics of an Axial Piston Pump

Zhang

et al. 2017

Shock and Vibration

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Low noise axial piston pumps become the rapid increasing demand in modern hydraulic fluid power systems. This paper proposes a systematic approach to simulate the vibroacoustic characteristics of an axial piston pump using a hybrid lumped parameters/finite element/boundary element (LP/FE/BE) model, and large amount of experimental work was performed to validate the model. The LP model was developed to calculate the excitation forces and was validated by a comparison of outlet flow ripples. The FE model was developed to calculate the vibration of the pump, in which the modeling of main friction pairs using different spring elements was presented in detail, and the FE model was validated using experimental modal analysis and measured vibrations. The BE model was used to calculate the noise emitted from the pump, and a measurement of sound pressure level at representative field points in a hemianechoic chamber was conducted to validate the BE model. Comparisons between the simulated and measured results show that the developed LP/FE/BE model is effective in capturing the vibroacoustic characteristics of the pump. The presented approach can be extended to other types of fluid power components and contributes to the development of quieter fluid power systems.

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“…In return to so many resources and efforts, the outcome is a very powerful tool, able to study the effects of relevant pump design parameters such as gear characteristics (profile, shape, material and errors) and other relevant parts (input and output chambers, transportation arc, lateral plates grooves, bearing blocks, etc.) (Mucchi et al, 2010a;2010b;Opperwall, Vacca, 2014).…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic Measurements and Simulations Applied to External Gear Pumps. An Integrated Simplified Approach

Carletti¹,

Miccoli²,

Pedrielli³

et al. 2016

Archives of Acoustics

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This paper describes the development phases of a numerical-experimental integrated approach aimed at obtaining sufficiently accurate predictions of the noise field emitted by an external gear pump by means of some vibration measurements on its external casing. Harmonic response methods and vibroacoustic analyses were considered as the main tools of this methodology. FFT acceleration spectra were experimentally acquired only in some positions of a 8.5 cc/rev external gear pump casing for some working conditions and considered as external excitation boundary conditions for a FE quite simplified vibroacoustic model. The emitted noise field was computed considering the pump as a 'black box', without taking into account the complex dynamics of the gear tooth meshing process and the consequent fluid pressure and load distribution. Sound power tests, based on sound intensity measurements, as well as sound pressure measurements in some positions around the pump casing were performed for validation purposes. The comparisons between numerical and experimental results confirmed the potentiality of this approach in offering a good compromise between noise prediction accuracy and reduction of experimental and modelling requirements.

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A combined FEM/BEM model and experimental investigation into the effects of fluid-borne noise sources on the air-borne noise generated by hydraulic pumps and motors

Cited by 19 publications

References 15 publications

Modeling Noise Sources and Propagation in External Gear Pumps

Modeling Noise Sources and Propagation in External Gear Pumps

A Hybrid Lumped Parameters/Finite Element/Boundary Element Model to Predict the Vibroacoustic Characteristics of an Axial Piston Pump

Vibroacoustic Measurements and Simulations Applied to External Gear Pumps. An Integrated Simplified Approach

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