Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line
It is known that fluid-borne noise emitted from a hydraulic system often causes severe discomfort of the operator. It is also known that the noise can change as the system warms up. The temporal change in steady operation can be a factor for misperception of mechanical failure, because noise can pla...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2017-01-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/845/83_16-00287/_pdf/-char/en |
| _version_ | 1797989159764230144 |
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| author | Shuichi NAKAGAWA Takayoshi ICHIYANAGI Takao NISHIUMI |
| author_facet | Shuichi NAKAGAWA Takayoshi ICHIYANAGI Takao NISHIUMI |
| author_sort | Shuichi NAKAGAWA |
| collection | DOAJ |
| description | It is known that fluid-borne noise emitted from a hydraulic system often causes severe discomfort of the operator. It is also known that the noise can change as the system warms up. The temporal change in steady operation can be a factor for misperception of mechanical failure, because noise can play an important role as a signal that indicates abnormal operation. It is therefore important to understand the behavior of hydraulic pressure ripples that are a source of hydraulic noise in steady operation, and how they change in relation to the operating time. This study has investigated the influence of oil temperature changing over time on pressure ripples in a hydraulic line in steady operation. Variables that can change in steady operation have been considered using mathematical models of the pressure ripples. The consideration has shown that, when there is no air-entrainment from an outer system, the change over time is caused solely by the change of the hydraulic oil temperature. Physical properties of the oil and speed of sound in the oil have been defined as temperature-related variables in the mathematical models. The physical properties that are used in the mathematical models have been obtained directly from the manufacturer. In contrast, the speed of sound in the oil has to be obtained using theoretical approaches. The behaviors of the hydraulic pressure ripples in three simple hydraulic systems have been investigated using mathematical models that took into account the thermal properties. Each hydraulic system consists of a hydraulic pump, a straight pipe and a termination condition that is one of the following typical three types: non-reflection, valve and volume. The mathematical models have shown distinct behaviors resulting from the change in the oil temperature. The behaviors have been verified experimentally. |
| first_indexed | 2024-04-11T08:14:43Z |
| format | Article |
| id | doaj.art-4d926071fd8d4f51925c81071255572d |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:14:43Z |
| publishDate | 2017-01-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-4d926071fd8d4f51925c81071255572d2022-12-22T04:35:11ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-01-018384516-0028716-0028710.1299/transjsme.16-00287transjsmeInfluence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic lineShuichi NAKAGAWA0Takayoshi ICHIYANAGI1Takao NISHIUMI2Fundamental Technology Research Division, Research and Development Center, Yanmar Co., Ltd.Department of Mechanical Systems Engineering, National Defense AcademyDepartment of Mechanical Systems Engineering, National Defense AcademyIt is known that fluid-borne noise emitted from a hydraulic system often causes severe discomfort of the operator. It is also known that the noise can change as the system warms up. The temporal change in steady operation can be a factor for misperception of mechanical failure, because noise can play an important role as a signal that indicates abnormal operation. It is therefore important to understand the behavior of hydraulic pressure ripples that are a source of hydraulic noise in steady operation, and how they change in relation to the operating time. This study has investigated the influence of oil temperature changing over time on pressure ripples in a hydraulic line in steady operation. Variables that can change in steady operation have been considered using mathematical models of the pressure ripples. The consideration has shown that, when there is no air-entrainment from an outer system, the change over time is caused solely by the change of the hydraulic oil temperature. Physical properties of the oil and speed of sound in the oil have been defined as temperature-related variables in the mathematical models. The physical properties that are used in the mathematical models have been obtained directly from the manufacturer. In contrast, the speed of sound in the oil has to be obtained using theoretical approaches. The behaviors of the hydraulic pressure ripples in three simple hydraulic systems have been investigated using mathematical models that took into account the thermal properties. Each hydraulic system consists of a hydraulic pump, a straight pipe and a termination condition that is one of the following typical three types: non-reflection, valve and volume. The mathematical models have shown distinct behaviors resulting from the change in the oil temperature. The behaviors have been verified experimentally.https://www.jstage.jst.go.jp/article/transjsme/83/845/83_16-00287/_pdf/-char/enpressure ripplefluid power systemspeed of soundbulk modulus |
| spellingShingle | Shuichi NAKAGAWA Takayoshi ICHIYANAGI Takao NISHIUMI Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line Nihon Kikai Gakkai ronbunshu pressure ripple fluid power system speed of sound bulk modulus |
| title | Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line |
| title_full | Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line |
| title_fullStr | Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line |
| title_full_unstemmed | Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line |
| title_short | Influence of oil temperature changing over time on pump-induced pressure ripples in a hydraulic line |
| title_sort | influence of oil temperature changing over time on pump induced pressure ripples in a hydraulic line |
| topic | pressure ripple fluid power system speed of sound bulk modulus |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/845/83_16-00287/_pdf/-char/en |
| work_keys_str_mv | AT shuichinakagawa influenceofoiltemperaturechangingovertimeonpumpinducedpressureripplesinahydraulicline AT takayoshiichiyanagi influenceofoiltemperaturechangingovertimeonpumpinducedpressureripplesinahydraulicline AT takaonishiumi influenceofoiltemperaturechangingovertimeonpumpinducedpressureripplesinahydraulicline |