Experimental investigation on the sharpness reduction of an axial piston pump with reinforced shell

Zhang, Junhui; Xia, Shiqi; Ye, Shaogan; Xu, Bing; Zhu, Shiqiang; Xiang, Jiawei; Tang, Hesheng

doi:10.1016/j.apacoust.2018.08.005

Cited by 14 publications

(5 citation statements)

References 26 publications

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“…The available literature on experimental modal analysis (EMA) of positive displacement machines addresses different aspects. Most studies have conducted EMA as an intermediate step to validate structural models, which are parts of the numerical vibroacoustic models for the prediction of noise and vibration responses during machine operation [14][15][16][17][18]. EMA has also been used to investigate the resonant behaviors of the system, to explore the contribution of noise sources to the structure-and air-borne noise [19], or to achieve noise reduction by avoiding the coincidence between the excitation and resonant frequencies [20].…”

Section: State Of the Artmentioning

confidence: 99%

An Investigation of the Vibration Modes of an External Gear Pump through Experiments and Numerical Modeling

Woo¹,

Vacca²

2022

Energies

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This paper presents an experimental and numerical modal analysis for an external gear pump considering its mounting on a test rig in a laboratory setting. Most of the previous studies on experimental modal analysis (EMA) of hydraulic pumps focused on the modal frequencies to allow model validation. However, the mode shapes of pump bodies have not extensively been discussed. Furthermore, the nature of the pump components assembly and mounting poses some modeling challenges, such as the uncertain material properties of each component, the behavior of the bolted joints, and some critical modeling boundary conditions related to pump mounting. In this regard, the experimentally obtained vibration modes of a reference pump using the least-square complex exponential (LSCE) method are analyzed with an emphasis on the characteristics of the mode shapes. Then, simple modeling strategies are proposed and validated by performing the analysis from the component level to the full assembly. As a result, the mode shapes are categorized depending on the type of motions that the modes exhibit. It is observed that the pump casing does not show any substantial deformation but is close to the rigid body motion. Moreover, without considerably increasing model complexities, the proposed numerical approach provides reasonable accuracy with average errors in modal frequencies of 6%, as well as good agreement in terms of mode shapes. The vibration reduction strategy is briefly discussed based on the measured mode shapes, and the proposed modeling approaches can be useful to study external gear pumps with minimal model complexities yet allowing reasonable result accuracy.

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Section: State Of the Artmentioning

confidence: 99%

An Investigation of the Vibration Modes of an External Gear Pump through Experiments and Numerical Modeling

Woo¹,

Vacca²

2022

Energies

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“…The solid isotropic microstructures with penalization (SIMP) method is a kind of variable density method, which is widely used for static dynamic structure optimization due to its robustness and fast computation. 30,31 Thus, in this study, this method is employed, where the key idea is that the stiffness of the material with penalty is assumed to be where r is the relative density, p is the penalization factor, and E is the elastic modulus.…”

Section: Topology Optimizationmentioning

confidence: 99%

Integrated topology optimization for vibration suppression in a vertical pump

Zhang

Ren

et al. 2019

Advances in Mechanical Engineering

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This article presents a new approach aiming to reducing pump vibration by modifying its baseplate structure. The finite element models of the vertical pump were established and validated by the experimental impact test. The natural frequencies of pump were mapped in both experimental and numerical methods. The weak stiffness of the baseplate was identified as the root cause for the pump vibration. A topology optimization was used for enhancing the stiffness of baseplate and controlling its weight. The new baseplate was designed according to the inputs from optimization results and manufactured by the casting method. Both the vibration tests and the numerical simulations were carried out to investigate the vibration behaviors of the optimized pump model. The differences of vibration characteristics between original and optimized pumps were evaluated using 1/3 octave-band filter technique. Results show that the vibration was suppressed, and the resonance at 31.5 Hz was eliminated using the optimized baseplate. In particular, the maximum vibration amplitude of the vertical pump was reduced from 4.05 to 1.75 mm/s at the low flow rate condition. It was experimentally confirmed that the vibration amplitude of the optimized model complies with the requirements of the International Organization for Standardization standard and ensures the pump can operate stable for a long time.

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“…The sharpness calculation is based on the specific loudness [19]. To date, only the sharpness generated from the Zwicker specific loudness has been standardized (as DIN 45692:2009 [22]) and applied in numerous SQ studies [23][24][25][26][27][28][29]. To calculate the sharpness using the Moore-Glasberg specific loudness, the method proposed by Swift and Gee [30,31] was applied in this study.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Improvement of the Sound Quality of a Diesel Engine Based on Tests and Simulations

Yang

Feng

et al. 2020

Energies

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Traditional acoustic evaluation of a diesel engine generally uses the A-weighted sound pressure level (AWSPL) and radiated sound power to assess the noise of an engine prototype present in an experiment. However, this cannot accurately and comprehensively reflect the auditory senses of human subjects during the simulation stage. To overcome such shortage, the Moore–Glasberg loudness and sharpness approach is applied to evaluate and improve the sound quality (SQ) of a 16 V-type marine diesel engine, and synthesizing noise audio files. Through finite element (FE) simulations, the modes of the engine’s block and the average vibrational velocity of the entire engine surface were calculated and compared with the test results. By further applying an automatically matched layer (AML) approach, the engine-radiated sound pressure level (SPL) and sound power contributions of all engine parts were obtained. By analyzing the Moore–Glasberg loudness and sharpness characteristics of three critical sound field points, an improvement strategy of the oil sump was then proposed. After improvement, both the loudness and sharpness decreased significantly. To verify the objective SQ evaluation results, ten noise audio clips of the diesel engine were then synthesized and tested. The subjective evaluation results were in accordance with the simulated analysis. Therefore, the proposed approach to analyze and improve the SQ of a diesel engine is reliable and effective.

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Experimental investigation on the sharpness reduction of an axial piston pump with reinforced shell

Cited by 14 publications

References 26 publications

An Investigation of the Vibration Modes of an External Gear Pump through Experiments and Numerical Modeling

An Investigation of the Vibration Modes of an External Gear Pump through Experiments and Numerical Modeling

Integrated topology optimization for vibration suppression in a vertical pump

Evaluation and Improvement of the Sound Quality of a Diesel Engine Based on Tests and Simulations

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