Designing Quieter Hydraulic Systemssome Recent Developments and Contributions

Edge, K A

doi:10.5739/isfp.1999.3

Cited by 19 publications

(12 citation statements)

References 33 publications

(16 reference statements)

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“…The higher integer multiples are also present. (8) The higher multiples of the pump primary frequency feature can be clearly seen as they dominate the frequency spectrum. Furthermore, while the frequency content occurs in basically the same locations on the spectrum across all four discrete measurement points, it does not contain the same magnitudes at those frequencies.…”

Section: Power Resultsmentioning

confidence: 98%

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Performing and Interpreting Experiments Towards Understanding Noise Generation in Displacement Machines

Opperwall¹,

Vacca²

2013

Linköping Electronic Conference Proceedings

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Noise generation in fluid power systems remains an important problem in current applications, and in the expansion of fluid power to new lighter applications such as passenger vehicles. The current research looks to understand noise generation from two main angles, experimental measurements and numerical modeling. This activity shows the experimental procedures and results towards better understanding the noise performance in the particular case of external gear pumps. Sound intensity measurements and analysis of the frequency characteristics of these machines are used to characterize the airborne noise generated. Better understanding of the key sources and transmission paths of the noise can lead to a better understanding of how to improve the noise performance from a design standpoint. The method of measuring and interpreting the noise performance of several different displacement machines is explained along with the significance of the results pertaining to the design of new quieter hydraulic solutions. This research serves the more general goal as a validation reference for modeling noise generation and propagation from the sources inside the machine and out to the environment.

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Section: Power Resultsmentioning

confidence: 98%

“…Other concepts relating to attenuating line pressure ripple were presented by Earnhart [7]. Edge [8] demonstrated how to take into consideration the system specifications in order to reduce the generated noise. Hartmann [9] optimized an internal gear pump to reduce the FBN.…”

Section: Introductionmentioning

confidence: 99%

Performing and Interpreting Experiments Towards Understanding Noise Generation in Displacement Machines

Opperwall¹,

Vacca²

2013

Linköping Electronic Conference Proceedings

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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%

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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“…These oscillation forces and resulting moments introduce vibrations to all pump parts, especially to the swash plate and the pump housing. Structural vibrations generate noise and decrease pump reliability by inducing fatigue wear [2][3][4][5]. Thus, it is desirable to introduce technologies which can help to damp these vibrations.…”

Section: Introductionmentioning

confidence: 99%

Active Vibration Control of Swash Plate-Type Axial Piston Machines with Two-Weight Notch Least Mean Square/Filtered-x Least Mean Square (LMS/FxLMS) Filters

Kim

Ivantysynova

2017

Energies

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Abstract:In this paper, swash plate active vibration control techniques were investigated utilizing the weight-limited multi-frequency two-weight notch Least Mean Square (LMS) filter with unit delay compensation and multi-frequency two-weight notch Filtered-x Least Mean Sqaure (FxLMS) filter with offline modeling to achieve adjustable swash plate vibration reduction at the desired frequency. Simulation studies of the high fidelity pump control system model including realistic swash plate moments are presented to demonstrate the feasibility of the swash plate active vibration control. A 75-cm 3 /rev swash plate type axial piston pump was modified to implement a high bandwidth pump control system which is required for canceling the swash plate vibration. High speed real-time controllers were proposed and realized using an National Instrument LabVIEW Field Programmable Gate Array (FPGA). Vibration measurements using a tri-axial swash plate acceleration sensor were conducted to show the influence and effectiveness of the proposed swash plate active vibration control system and algorithms.

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Designing Quieter Hydraulic Systemssome Recent Developments and Contributions

Cited by 19 publications

References 33 publications

Performing and Interpreting Experiments Towards Understanding Noise Generation in Displacement Machines

Performing and Interpreting Experiments Towards Understanding Noise Generation in Displacement Machines

Modeling Noise Sources and Propagation in External Gear Pumps

Active Vibration Control of Swash Plate-Type Axial Piston Machines with Two-Weight Notch Least Mean Square/Filtered-x Least Mean Square (LMS/FxLMS) Filters

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