Pub Date : 2018-07-01DOI: 10.1109/gfps.2018.8472388
{"title":"[Copyright notice]","authors":"","doi":"10.1109/gfps.2018.8472388","DOIUrl":"https://doi.org/10.1109/gfps.2018.8472388","url":null,"abstract":"","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121922874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472401
R. Pavel, Rodionov Leonid, Satsyuk Ivan
This work provides collecting, analyzing and discussing the published information in the field of additive manufacturing of hydraulic units, hydrodynamic characteristics, hydraulic and mass-dimensional characteristics, sealing of hydraulic units [1], [2], [3]. The goal of the research consists of producing hydraulic units with increased energy efficiency manufactured by the SLM method. To do this, the authors have provided an overview of the current state of the hydraulic units manufactured by the powder bed fusion technologies. Groups of units and their parts, most frequently produced by powder bed fusion technologies have been placed special emphasis on. In the examined units, the pressure and flow rates remained the same as in the original manufacturing method. The use of optimal design programs led to a reduction in the mass and dimensions of the casing parts by 95% and 75% respectively, and also to obtaining 60% less pressure loss at a given flow rate. The SLM method has been identified as the most optimal for producing sealing surfaces. From the point of view of surface quality, we have come to conclusion that the roughness of the valves channels, manifolds and valve blocks within Ra 2-40 μ m can be obtained by powder bed fusion technologies. For spool valves and valve-saddle surfaces obtained by powder bed fusion technologies, post-processing is required because of the requirement for lower durability for long- term performance. Further research will be focused on the development of a methodology for designing energy-efficient hydraulic units with reduced mass and hydrodynamic characteristics.
{"title":"Analysis of hydraulic units manufactured by powder bed fusion","authors":"R. Pavel, Rodionov Leonid, Satsyuk Ivan","doi":"10.1109/GFPS.2018.8472401","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472401","url":null,"abstract":"This work provides collecting, analyzing and discussing the published information in the field of additive manufacturing of hydraulic units, hydrodynamic characteristics, hydraulic and mass-dimensional characteristics, sealing of hydraulic units [1], [2], [3]. The goal of the research consists of producing hydraulic units with increased energy efficiency manufactured by the SLM method. To do this, the authors have provided an overview of the current state of the hydraulic units manufactured by the powder bed fusion technologies. Groups of units and their parts, most frequently produced by powder bed fusion technologies have been placed special emphasis on. In the examined units, the pressure and flow rates remained the same as in the original manufacturing method. The use of optimal design programs led to a reduction in the mass and dimensions of the casing parts by 95% and 75% respectively, and also to obtaining 60% less pressure loss at a given flow rate. The SLM method has been identified as the most optimal for producing sealing surfaces. From the point of view of surface quality, we have come to conclusion that the roughness of the valves channels, manifolds and valve blocks within Ra 2-40 μ m can be obtained by powder bed fusion technologies. For spool valves and valve-saddle surfaces obtained by powder bed fusion technologies, post-processing is required because of the requirement for lower durability for long- term performance. Further research will be focused on the development of a methodology for designing energy-efficient hydraulic units with reduced mass and hydrodynamic characteristics.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124715511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472371
Roman Ivantysyn, A. Shorbagy, J. Weber
Axial piston pumps are universal displacement machines that are used in a vast variety of applications. Their high pressure resistance and ease of operation make them very popular, especially in mobile applications. Each pump is designed to last several thousand operating hours, but some fail before their expected time. Aspects that play a role in premature failure, are the load cycle, the application, and also the manufacturing tolerances of the parts that define the sealing interface. These tolerances are already very tight for these machines, nevertheless every pump will behave differently in their first operating hours- the run-in. This paper gives a small glimpse into this phenomenon.The run-in is the period where the pump parts experience higher than usual wear, which means that the sealing lands will conform to a geometry that will support the load. It is known that the run-in varies even within one pump model. However, there are many unknowns, for example the ideal run-in operating conditions or the dependency on external conditions such as oil, temperature or loads. Another unknown is whether the geometry after the run-in will always be the same, for the same run-in procedure, or does it vary depending the tolerances of the parts.To give some answers to these questions an innovative test rig was built, to measure the temperatures and fluid film thickness of the slipper/swash plate and cylinder block/valve plate interface of an axial piston pump. Other information such as particles, pressures and vibration were recorded, to give a unique insight into the inner workings of a pump. In addition, a very sophisticated simulation tool, called Caspar FSTI, was used to model the tribological interfaces, place the sensors in critical regions and predict run-in patterns. Previous publications of the authors have shown first trends of wear, within this paper the run-in of the pump will be analyzed more in detail.
{"title":"Analysis of the Run-in Behavior of Axial Piston Pumps","authors":"Roman Ivantysyn, A. Shorbagy, J. Weber","doi":"10.1109/GFPS.2018.8472371","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472371","url":null,"abstract":"Axial piston pumps are universal displacement machines that are used in a vast variety of applications. Their high pressure resistance and ease of operation make them very popular, especially in mobile applications. Each pump is designed to last several thousand operating hours, but some fail before their expected time. Aspects that play a role in premature failure, are the load cycle, the application, and also the manufacturing tolerances of the parts that define the sealing interface. These tolerances are already very tight for these machines, nevertheless every pump will behave differently in their first operating hours- the run-in. This paper gives a small glimpse into this phenomenon.The run-in is the period where the pump parts experience higher than usual wear, which means that the sealing lands will conform to a geometry that will support the load. It is known that the run-in varies even within one pump model. However, there are many unknowns, for example the ideal run-in operating conditions or the dependency on external conditions such as oil, temperature or loads. Another unknown is whether the geometry after the run-in will always be the same, for the same run-in procedure, or does it vary depending the tolerances of the parts.To give some answers to these questions an innovative test rig was built, to measure the temperatures and fluid film thickness of the slipper/swash plate and cylinder block/valve plate interface of an axial piston pump. Other information such as particles, pressures and vibration were recorded, to give a unique insight into the inner workings of a pump. In addition, a very sophisticated simulation tool, called Caspar FSTI, was used to model the tribological interfaces, place the sensors in critical regions and predict run-in patterns. Previous publications of the authors have shown first trends of wear, within this paper the run-in of the pump will be analyzed more in detail.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125446811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472382
Matteo Venturelli, M. Milani, L. Montorsi, C. Torelli
This paper investigates the predictive capabilities of numerical simulation for addressing the actual operation of the hydraulic system of a filling machine for beverage packaging processes. The lumped and distributed parameter approach is compared to the full CFD simulation of the filling system and the accuracy of the results obtained is assessed in case of Newtonian and non-Newtonian fluids. First, the 0D-1D model of the complete hydraulic system of the machine filling process is constructed and validated against experimental measurements carried out using water as an operating fluid. Afterward, a combined 1D/3D simulation is carried out in order to simulate the real control strategy of the machine as well as to accurately determine the flow dynamic within the piping. Finally, the two approaches are confronted when using a non-Newtonian fluid and their advantages and limitations are outlined.
{"title":"Influence of non-Newtonian fluid on transient operation of a liquid packaging machine: a combined 1D-3D approach","authors":"Matteo Venturelli, M. Milani, L. Montorsi, C. Torelli","doi":"10.1109/GFPS.2018.8472382","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472382","url":null,"abstract":"This paper investigates the predictive capabilities of numerical simulation for addressing the actual operation of the hydraulic system of a filling machine for beverage packaging processes. The lumped and distributed parameter approach is compared to the full CFD simulation of the filling system and the accuracy of the results obtained is assessed in case of Newtonian and non-Newtonian fluids. First, the 0D-1D model of the complete hydraulic system of the machine filling process is constructed and validated against experimental measurements carried out using water as an operating fluid. Afterward, a combined 1D/3D simulation is carried out in order to simulate the real control strategy of the machine as well as to accurately determine the flow dynamic within the piping. Finally, the two approaches are confronted when using a non-Newtonian fluid and their advantages and limitations are outlined.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115412572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472381
Siavash Danaee, T. Minav, M. Pietola
Physical sensors have traditionally been used to obtain position information. These sensors possess certain deficiencies, such as a dependency on the working environment. Nevertheless, by removing the position sensors as well as defining methods and algorithms, it will be possible to indirectly obtain data from other present sensors. This paper surveys studies on sensorless position control on electric motors and hydraulic systems by reviewing the offered methods, their advantages and disadvantages, and future trends. By understanding the sensorless techniques in electrical motors and hydraulic systems, the future trends of electro-hydraulic systems will have a vast potential for improvement.
{"title":"Sensorless Position Control For Electro-Hydraulic System–A technological status review","authors":"Siavash Danaee, T. Minav, M. Pietola","doi":"10.1109/GFPS.2018.8472381","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472381","url":null,"abstract":"Physical sensors have traditionally been used to obtain position information. These sensors possess certain deficiencies, such as a dependency on the working environment. Nevertheless, by removing the position sensors as well as defining methods and algorithms, it will be possible to indirectly obtain data from other present sensors. This paper surveys studies on sensorless position control on electric motors and hydraulic systems by reviewing the offered methods, their advantages and disadvantages, and future trends. By understanding the sensorless techniques in electrical motors and hydraulic systems, the future trends of electro-hydraulic systems will have a vast potential for improvement.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125619814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472365
Teemu Koitto, O. Calonius, Heikki Kauranne, T. Minav, M. Pietola
Direct Driven Hydraulic (DDH) systems, which are characterized by a closed circuit type and a speed-controlled pump, offer a possibility of reaching higher energy efficiencies compared to the traditional open circuit type valve-controlled systems, and simultaneously offering high accuracy and dynamics. This study presents experimental results gained with a DDH system applied to an industrial position control application. The results include the system behavior regarding the accuracy of position control, pressures, power, and energy consumption with three different system structures: basic DDH, load- compensated DDH and load-compensated and damped DDH. It was found that compared to valve-controlled hydraulics, DDH system offered potential for significant energy savings, especially if combined with hydraulic load compensation. However, without damping, the motion involved marked vibrations in the end of the stroke. Vibrations were avoided by introducing damping, but at the cost of reduced energy efficiency.
{"title":"Enhanced energy efficiency of industrial application by direct driven hydraulic unit","authors":"Teemu Koitto, O. Calonius, Heikki Kauranne, T. Minav, M. Pietola","doi":"10.1109/GFPS.2018.8472365","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472365","url":null,"abstract":"Direct Driven Hydraulic (DDH) systems, which are characterized by a closed circuit type and a speed-controlled pump, offer a possibility of reaching higher energy efficiencies compared to the traditional open circuit type valve-controlled systems, and simultaneously offering high accuracy and dynamics. This study presents experimental results gained with a DDH system applied to an industrial position control application. The results include the system behavior regarding the accuracy of position control, pressures, power, and energy consumption with three different system structures: basic DDH, load- compensated DDH and load-compensated and damped DDH. It was found that compared to valve-controlled hydraulics, DDH system offered potential for significant energy savings, especially if combined with hydraulic load compensation. However, without damping, the motion involved marked vibrations in the end of the stroke. Vibrations were avoided by introducing damping, but at the cost of reduced energy efficiency.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123732693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472404
P. Greshniakov, H. Handroos, V. Sverbilov
A replacement of a proportional valves with digital valves in pneumatic positioning systems possesses numerous attractive features that reduce the cost of actuation systems. Due to operation of pneumatic actuator with digital valves continuous switching mode is possible. Such mode decreases the system efficiency and valve durability. A large number of parallel connected valves is better to be controlled separately with a large number of opening state combinations because it decreases switching and increases efficiency. It also leads to better performance than the traditional control solutions based on digital valves, which are being widely adopted in industrial applications such as robotics, automobiles, manufacturing, and motion simulators. This paper introduces and investigates the benefits of the pneumatic actuation systems with a large number of parallel connected low-cost on/off valves acting in pulse number modulation.
{"title":"Position Control of Pneumatic Cylinder Actuated by Low-Cost On/Off Valves Pulse Number Modulation","authors":"P. Greshniakov, H. Handroos, V. Sverbilov","doi":"10.1109/GFPS.2018.8472404","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472404","url":null,"abstract":"A replacement of a proportional valves with digital valves in pneumatic positioning systems possesses numerous attractive features that reduce the cost of actuation systems. Due to operation of pneumatic actuator with digital valves continuous switching mode is possible. Such mode decreases the system efficiency and valve durability. A large number of parallel connected valves is better to be controlled separately with a large number of opening state combinations because it decreases switching and increases efficiency. It also leads to better performance than the traditional control solutions based on digital valves, which are being widely adopted in industrial applications such as robotics, automobiles, manufacturing, and motion simulators. This paper introduces and investigates the benefits of the pneumatic actuation systems with a large number of parallel connected low-cost on/off valves acting in pulse number modulation.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128998815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472394
Lv Xinbei, Lomakin Vladimir, Li Songjing
Nowadays, more and more attention has been paid to the flapper deflection servo valve for its long service life and lasting antifouling. As a core part of flapper deflection servo valve, deflector pilot stage’s performance has a serious impact on the capability of the entire servo valve. Aiming to improve the performance of deflector pilot stage and observing the cavitation variation of flow field, this paper establishes a suitable numerical simulation model of the deflector pilot stage by software STAR-CCM+. New performance parameter whose name is pressure-sensitive coefficient number is proposed to reflect the character of pressure variation in deflector pilot stage. By changing the configuration of inlet nozzle, the cavitation variation and pressure-sensitive coefficient number are analyzed to get a higher performance. At last the best size is obtained which include the height, width and the position of symmetrical characteristic.
{"title":"Performance and Flow Field Analysis of Flapper Deflection Servo Valve","authors":"Lv Xinbei, Lomakin Vladimir, Li Songjing","doi":"10.1109/GFPS.2018.8472394","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472394","url":null,"abstract":"Nowadays, more and more attention has been paid to the flapper deflection servo valve for its long service life and lasting antifouling. As a core part of flapper deflection servo valve, deflector pilot stage’s performance has a serious impact on the capability of the entire servo valve. Aiming to improve the performance of deflector pilot stage and observing the cavitation variation of flow field, this paper establishes a suitable numerical simulation model of the deflector pilot stage by software STAR-CCM+. New performance parameter whose name is pressure-sensitive coefficient number is proposed to reflect the character of pressure variation in deflector pilot stage. By changing the configuration of inlet nozzle, the cavitation variation and pressure-sensitive coefficient number are analyzed to get a higher performance. At last the best size is obtained which include the height, width and the position of symmetrical characteristic.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128639988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472362
G. Matthiesen, A. Braun, O. Reinertz, K. Schmitz
The modelling of hydraulic and pneumatic systems is essential for the machine development and control design process. In most cases, lumped parameter models provide sufficient accuracy. However, for some fluid power systems this approach doesn’t result in a useful model for example due to non-linearities of the system. An approach to overcome this issue is the use of local model networks. In this paper, a brief introduction into local model networks is given presenting the basic idea and the approximation algorithm used to derive the network. In the following, a calculation scheme is presented that allows fast evaluation of the network and thus enables the implementation into machine control for small cycle-times. The local model network approach is used to model the pneumatic hot gas bulge test, which is used in material characterisation. A database generated from FEM simulation is applied to set up the local model network. The final result is the comparison and discussion of the local model network output and a training set generated from FEM simulation.
{"title":"Design of a semi-physical dynamic model for a pneumatic bulge test using local model networks trained with FEM data","authors":"G. Matthiesen, A. Braun, O. Reinertz, K. Schmitz","doi":"10.1109/GFPS.2018.8472362","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472362","url":null,"abstract":"The modelling of hydraulic and pneumatic systems is essential for the machine development and control design process. In most cases, lumped parameter models provide sufficient accuracy. However, for some fluid power systems this approach doesn’t result in a useful model for example due to non-linearities of the system. An approach to overcome this issue is the use of local model networks. In this paper, a brief introduction into local model networks is given presenting the basic idea and the approximation algorithm used to derive the network. In the following, a calculation scheme is presented that allows fast evaluation of the network and thus enables the implementation into machine control for small cycle-times. The local model network approach is used to model the pneumatic hot gas bulge test, which is used in material characterisation. A database generated from FEM simulation is applied to set up the local model network. The final result is the comparison and discussion of the local model network output and a training set generated from FEM simulation.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121246149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472316
G. Moslått, M. Hansen
This paper presents a method for friction modeling in a hydraulically actuated multi motor winch system of an offshore knuckle boom crane. The method is based on a combination of a model of the variable displacement axial piston motor based on measurements from the sub supplier, and combined with a model of the remaining friction loss obtained from measurements on the full system.
{"title":"Modeling of Friction Losses in Offshore Knuckle Boom Crane Winch System","authors":"G. Moslått, M. Hansen","doi":"10.1109/GFPS.2018.8472316","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472316","url":null,"abstract":"This paper presents a method for friction modeling in a hydraulically actuated multi motor winch system of an offshore knuckle boom crane. The method is based on a combination of a model of the variable displacement axial piston motor based on measurements from the sub supplier, and combined with a model of the remaining friction loss obtained from measurements on the full system.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126546080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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