Investigation of Cavitation Bubble Dynamics Considering Pressure Fluctuation Induced by Slap Forces

Wang, Xiaoyu; Zhou, Shenghao; Shan, Zumeng; Yin, Mingang

doi:10.3390/math9172064

Cited by 5 publications

(4 citation statements)

References 22 publications

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Section: The Mediating Role Of Government Subsidymentioning

confidence: 93%

“…Government subsidies can help enterprises ease the economic pressure on green technology innovation and reduce carbon emission costs. Wang et al (2023) have supported the promoting effect of government subsidies on enterprises' carbon emission reduction. Government subsidy is often used as a kind of incentive policy and post‐reward to promote enterprises to improve their carbon performance, which can help enterprises contribute to carbon emission reduction (Wang & Sun, 2019).…”

Section: Research Hypothesismentioning

confidence: 99%

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Study on the impact of corporate social responsibility on carbon performance in the background of carbon peaking and carbon neutrality

Meng,

Zang,

2023

Business Ethics Env & Resp

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In the context of “carbon peaking and carbon neutrality,” companies are responsible for actively reducing carbon emissions and achieving a balance among economic, environmental, and social benefits. From a non‐economic perspective, this study chose a sample of 9872 A‐share manufacturing companies listed on the Shanghai and Shenzhen Stock Exchanges from 2010 to 2019. This study used the fixed‐effect model to explore the mechanism of corporate social responsibility (CSR) and its three sub‐dimensions (shareholder rights, employee rights, and social contribution) on corporate carbon performance. This study also examined the mediating mechanism of government subsidy and the moderating effects of internationalization and corporate governance as internal and external factors. The results show that: (1) CSR can significantly improve corporate carbon performance, and government subsidies play a partial intermediary role. (2) CSR significantly promotes carbon performance for firms with lower internationalization levels and higher corporate governance levels. (3) Heterogeneous conditions such as CSR disclosure willingness, CSR report quality, and corporate attributes have different impacts on corporate carbon performance. These findings can help government agencies formulate policies to promote CSR and restrain corporate carbon emissions. Corporate managers can also fulfill CSR and improve carbon performance through government subsidies, internationalization, and corporate governance.

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Section: The Mediating Role Of Government Subsidymentioning

confidence: 93%

Section: Research Hypothesismentioning

confidence: 99%

Study on the impact of corporate social responsibility on carbon performance in the background of carbon peaking and carbon neutrality

Meng,

Zang,

2023

Business Ethics Env & Resp

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“…The change of the pressure waveform also affects bubble formation and the progression of this process. The relationship between the timing of bubble formation and collapse, the distance of bubbles from solid boundaries, and their velocity with vibration has been presented in the literature [31].…”

Section: Cavitation Bubble Dynamicsmentioning

confidence: 99%

Investigation of the Relationship between Vibration Signals Due to Oil Impurity and Cavitation Bubbles in Hydraulic Pumps

2022

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Although hydraulic pumps are frequently used in daily life, improper use due to oil analysis or oil contamination is ignored. There is no instantaneous inspection; instead, the oil is changed periodically at certain times, whether it is contaminated or not. Hydraulic systems operate based on Pascal’s law, which states that the fluid will distribute the pressure equally to every point in a closed area. The fluid oil taken from an oil reservoir is moved into the pump by engine power. During this movement, as it passes through different pressure areas and different sections, undesirable events such as viscosity change and gas formation occur in the hydraulic oil. These formations collide with the outer walls and cause cavitation with respect to unwanted oil impurities. This cavitation causes unwanted vibration signals to occur in the normal working order of the system. As a result of cavitation, the particles that affect the lubricity and fluidity of the oil in the oil are mixed into the liquid and circulate freely. At the connection points, the blockage caused by the liquid in the pump cylinder block or the valve plate and the collisions of particles is effective. As a result, it creates vibrations of different frequencies. The frequency and amplitudes of these vibrations differ according to the degree of oil contamination. A method has been developed to find the degree of contamination of the oil circulating in the pump by looking at the amplitude and frequency of these vibrations measured from the motor body. There exist standards about the pollution of hydraulic fluid. With these standards, the maximum number of particles allowed for a given pollution level is defined. This topic is discussed in the conclusion to this study. This method has also been proven experimentally. Error and vibration analysis studies on pumps using a different approach are available in the literature. In these studies, pressure variation, total energy transmission, or artificial intelligence models were used to detect anomalies in the pump. In this study, the impurity rate of the oil was set at five different levels and the operating regime of the pump at each level was investigated experimentally. Rayleigh–Plesset and Zwart–Gerber–Belamri models, which are the most common cavitation models, were used to explain the bubble formation in the moving oil and the relationship of these bubbles with vibration. Frequency components were examined by the Discrete Fast Fourier Analysis method, where the operation of the pump was affected by the increase in oil impurity.

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“…In addition, flow passages in the cylinder block are irregular and complex. They exacerbate oil cavitation [7][8][9]. The pressure of some places in the interface between the cylinder block and valve plate is less than the gas separation pressure.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Fault Detection for Specific Cavitation Damage Based on the Discharge Pressure of Axial Piston Pumps

Xia

Xiang

2022

Mathematics

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Cavitation will increase the leakage and discharge pressure fluctuation of axial piston pumps. In particular, specific cavitation damage may aggravate the pressure impact and performance degradation. The influence of the specific cavitation damage on the discharge pressure is unclear, and the need for fault detection of this damage is urgent. In this paper, we propose a discharge pressure-based model and fault detection methodology for the specific cavitation damage of axial piston pumps. The discharge pressure model with specific damage is constructed using a slender hole. The simulation model is solved through numerical integration. Experimental investigation of cavitation damage detection is carried out. Discharge pressure features in the time domain and frequency domain are compared. The results show that waveform distortions, spectrum energy relocation, generation of new frequencies and sidebands can be used as features for fault detection regarding the specific cavitation damage of axial piston pumps.

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Investigation of Cavitation Bubble Dynamics Considering Pressure Fluctuation Induced by Slap Forces

Cited by 5 publications

References 22 publications

Study on the impact of corporate social responsibility on carbon performance in the background of carbon peaking and carbon neutrality

Study on the impact of corporate social responsibility on carbon performance in the background of carbon peaking and carbon neutrality

Investigation of the Relationship between Vibration Signals Due to Oil Impurity and Cavitation Bubbles in Hydraulic Pumps

Modelling and Fault Detection for Specific Cavitation Damage Based on the Discharge Pressure of Axial Piston Pumps

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