Oxidative Deterioration Effect of Cavitation Heat Generation on Hydraulic Oil

Li, Mingxue; Yang, Guolai; Wu, Guoguo; Li, Xiaoqing

doi:10.1109/access.2020.3005636

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…At the same time, because the hydraulic valve's flow channel is tiny, the high operating differential pressure and high flow rate at the valve Processes 2023, 11, 2814 2 of 13 ports make cavitation at the valve ports inescapable. The visual observation and noise of cavitation at valve ports is currently an essential problem for deeper understanding in the field of hydraulic control [9,10].…”

Section: Introductionmentioning

confidence: 99%

Cavitation Observation and Noise Characteristics in Rectangular Throttling Groove Spool

Zhang,

Fu,

Zhang

et al. 2023

Processes

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A hydraulic cavitation platform was developed in order to examine the occurrence of cavitation in the rectangular throttling groove spool and its correlation with noise characteristics. The test valve is constructed using PMMA material, which possesses excellent transparency. This transparency enables direct visual examination of cavitation occurring at the throttle slot. Additionally, high-speed photography is employed to observe the flow characteristics of the valve port, facilitating the analysis of cavitation morphology changes. Furthermore, a noise meter is utilized to measure and record the noise level and its corresponding spectrum. The flow field and flow phenomena at the rectangular throttling groove spool were studied using high-speed photography, noise spectrum analysis, and other methods. It is discovered that back pressure has the greatest influence on cavitation and flow separation, followed by the influence of intake pressure on cavitation morphology and noise. As the back pressure lowers, the cavitation morphology changes from flaky to cloudy, and the cavitation intensity, distribution area, and noise level increase. Background noise and cavitation noise have distinct frequency differences; cavitation noise in the rectangular throttling groove spool is high-frequency noise, with a frequency of more than 8 kHz, and the higher the frequency, the greater the difference in noise value. The magnitude of the alterations in noise intensity is minimal. The noise values exhibit slight variations of 2.3 dB, 4 dB, and 4.3 dB under varying back pressure circumstances of 3 MPa, 4 MPa, and 5 MPa inlet pressure, respectively. It is recommended to use the frequency of cavitation noise to detect the cavitation state and monitor the cavitation process. In the low-frequency region, the cavitation noise in the rectangular throttle groove valve core is not significantly different. Once the center frequency surpasses 3.15 kHz, a discernible distinction emerges, with the magnitude of the discrepancy in noise value increasing as the frequency rises. In other words, the cavitation cloud does not pulsate at one single frequency, but rather in a range of relatively high frequencies (more than 3.15 kHz).

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Section: Introductionmentioning

confidence: 99%

Cavitation Observation and Noise Characteristics in Rectangular Throttling Groove Spool

Zhang,

Fu,

Zhang

et al. 2023

Processes

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“…The cavitation in transmission oil is of particular concern because it degrades the oil, erodes gears, damages transmission, and degrades the transmission efficiency owing to the reduced lubrication characteristics. If the bubbles are not eliminated, it is possible that the transmission oil will oxidize and the bubbles will travel along the lubrication path, making it difficult to maintain a normal oil film thickness [ 1 ]. When high pressure is applied to a bubble, the temperature of the gas in the bubble increases because of adiabatic compression, and heat is transferred to the transmission, increasing the temperature of the transmission oil.…”

Section: Introductionmentioning

confidence: 99%

Development of a Temperature Distribution Measurement System for Transmission Oil for Transportation Equipment

Funatani

Takei

Tsukamoto

2023

Sensors

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In this study, an optical sensor using thermo-sensitive phosphor and its measurement system for visualizing and measuring the temperature distribution in an arbitrary cross-section of transmission oil using one type of phosphor, whose peak wavelength changes with temperature, is proposed. Because the intensity of the excitation light is gradually attenuated by the scattering of the laser light owing to microscopic impurities in the oil, we attempted to reduce the scattering effect by increasing the excitation light wavelength. Therefore, Pyrromethene 597 was selected as the optical sensor using thermo-sensitive phosphor, and a DPSS (Diode Pumped Solid State) laser with a wavelength of 532 nm was used as the excitation light. Using this measurement system, we measured the temperature distribution of a vertical buoyant jet of transmission oil and validated the measurement method. In addition, it was shown that this measurement system could be applied to the measurement of the temperature distribution in transmission oil with cavitation foaming.

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A New Type of Electric Servo Actuator with an Energy Recovery Link and Its Dynamic and Energy Consumption Characteristics Analysis

et al. 2023

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Oxidative Deterioration Effect of Cavitation Heat Generation on Hydraulic Oil

Cited by 3 publications

References 19 publications

Cavitation Observation and Noise Characteristics in Rectangular Throttling Groove Spool

Cavitation Observation and Noise Characteristics in Rectangular Throttling Groove Spool

Development of a Temperature Distribution Measurement System for Transmission Oil for Transportation Equipment

A New Type of Electric Servo Actuator with an Energy Recovery Link and Its Dynamic and Energy Consumption Characteristics Analysis

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