Pub Date : 2018-07-01DOI: 10.1109/GFPS.2018.8472402
Evgeny Lukachev, R. Scheidl
Hydraulic drives are well known for their outstanding force and power density and drive stiffness. They are indispensable when heavy load applications have to meet strict demands on fast response and high precision. A typical example is the steel rolling mill where the majority of material forming operations is hydraulically actuated. Before long the only available control unit for these drives were servo valves. The latter have numerous disadvantages intrinsic to their concept and design: extreme sensitivity to oil cleanliness, vast leakages and high prices. The resulting high maintenance and installation costs, low efficiency, and reliability motivate to find a replacement for the servo valves, which do not have these disadvantages and provide similar or better performance. One of the possible solutions is employing one of the many digital hydraulic concepts, in this paper an elementary switching concept using fast switching valves. Basically, such valves do much better than the servos in terms of robustness to oil contamination and leakage, and they have also a reasonable potential for significantly lower price provided sufficient production quantities are reached. The main challenges of switching control are oscillations excited by fast switching and cavitation caused by fast valve closure. Oscillations have negative influence on the tracking performance and can be a source of unwanted noise. The problem is likely to be worsened by a transmission line between the cylinder and the valve control unit if the latter has to be placed some distance away from the cylinder or if the cylinder wall is thick and the connecting channel length cannot be neglected even by a directly mounted valve block. This paper presents prototypal realizations of an elementary hydraulic switching control drive concept for heavy load actuation. To this end a comprehensive analytical model in frequency domain is derived, which describes the plant- cylinder with transmission line - and the specially designed hydraulic compensator (RC-Filter). This model gives direct insight into the parameter influence on the system response. Series of simulations in MatLab Simulink are performed to study the features neglected in the analytical model like, e.g., valve dynamics or nonlinearities and to test and optimize the switching control algorithm. Finally, experimental work is reported which verifies the analytical and numerical models and evaluates the switching control position tracking performance for a number of different scenarios including steps, ramps and sinusoidal trajectories. The effect of control strategy is studied. The promising results lead to the conclusion that such type of switching control can be applied in heavy load industrial drive applications with high demands on response dynamics.
{"title":"Hydraulic Switching Type Position Control Of A Large Cylinder Drive","authors":"Evgeny Lukachev, R. Scheidl","doi":"10.1109/GFPS.2018.8472402","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472402","url":null,"abstract":"Hydraulic drives are well known for their outstanding force and power density and drive stiffness. They are indispensable when heavy load applications have to meet strict demands on fast response and high precision. A typical example is the steel rolling mill where the majority of material forming operations is hydraulically actuated. Before long the only available control unit for these drives were servo valves. The latter have numerous disadvantages intrinsic to their concept and design: extreme sensitivity to oil cleanliness, vast leakages and high prices. The resulting high maintenance and installation costs, low efficiency, and reliability motivate to find a replacement for the servo valves, which do not have these disadvantages and provide similar or better performance. One of the possible solutions is employing one of the many digital hydraulic concepts, in this paper an elementary switching concept using fast switching valves. Basically, such valves do much better than the servos in terms of robustness to oil contamination and leakage, and they have also a reasonable potential for significantly lower price provided sufficient production quantities are reached. The main challenges of switching control are oscillations excited by fast switching and cavitation caused by fast valve closure. Oscillations have negative influence on the tracking performance and can be a source of unwanted noise. The problem is likely to be worsened by a transmission line between the cylinder and the valve control unit if the latter has to be placed some distance away from the cylinder or if the cylinder wall is thick and the connecting channel length cannot be neglected even by a directly mounted valve block. This paper presents prototypal realizations of an elementary hydraulic switching control drive concept for heavy load actuation. To this end a comprehensive analytical model in frequency domain is derived, which describes the plant- cylinder with transmission line - and the specially designed hydraulic compensator (RC-Filter). This model gives direct insight into the parameter influence on the system response. Series of simulations in MatLab Simulink are performed to study the features neglected in the analytical model like, e.g., valve dynamics or nonlinearities and to test and optimize the switching control algorithm. Finally, experimental work is reported which verifies the analytical and numerical models and evaluates the switching control position tracking performance for a number of different scenarios including steps, ramps and sinusoidal trajectories. The effect of control strategy is studied. The promising results lead to the conclusion that such type of switching control can be applied in heavy load industrial drive applications with high demands on response dynamics.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"7 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":"122161295","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.2018.8472375
{"title":"GFPS 2018 Index","authors":"","doi":"10.1109/gfps.2018.8472375","DOIUrl":"https://doi.org/10.1109/gfps.2018.8472375","url":null,"abstract":"","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"31 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":"129516840","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.2018.8472379
A. Kumarin, A. Kuznetsov, G. Makaryants
Designing and testing gas turbine engine control systems requires hardware-in-the-loop (HIL) simulation to improve project time and guarantees safety. A HIL bench should provide real time calculations of object models. Thermodynamic gas turbine models are mostly not applicable for real-time computations due to solving constraints. Models should be accurate and easy-calculation for gas turbine engine modeling in the HIL. Those models can be created via neural networks. Thus, aim of this research is to design hardware-in-the-loop neuro- based simulation for testing gas turbine engine control system. The neural network model is based on JETCAT-P60 testing data. After network is synthesized, a code implementation is generated and integrated in MCU software. The regulator is implemented in another MCU-based electronic unit. The two units interact by simulating real system signals (PWM control and PFM frequency signal)$.mathrm {I}mathrm {n}$ result, the HIL-bench was verified by the JETCAT-P60 experiment and control system was tested.
{"title":"Hardware-in-the-loop neuro-based simulation for testing gas turbine engine control system","authors":"A. Kumarin, A. Kuznetsov, G. Makaryants","doi":"10.1109/GFPS.2018.8472379","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472379","url":null,"abstract":"Designing and testing gas turbine engine control systems requires hardware-in-the-loop (HIL) simulation to improve project time and guarantees safety. A HIL bench should provide real time calculations of object models. Thermodynamic gas turbine models are mostly not applicable for real-time computations due to solving constraints. Models should be accurate and easy-calculation for gas turbine engine modeling in the HIL. Those models can be created via neural networks. Thus, aim of this research is to design hardware-in-the-loop neuro- based simulation for testing gas turbine engine control system. The neural network model is based on JETCAT-P60 testing data. After network is synthesized, a code implementation is generated and integrated in MCU software. The regulator is implemented in another MCU-based electronic unit. The two units interact by simulating real system signals (PWM control and PFM frequency signal)$.mathrm {I}mathrm {n}$ result, the HIL-bench was verified by the JETCAT-P60 experiment and control system was tested.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"183 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":"132600285","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.2018.8472374
V. Lomakin, V. Cheremushkin, P. Chaburko
The article is devoted to exploration of vortex and hysteresis effects in the inlet device of a centrifugal pump, which were discovered during the designing of a multistage pump. At present, many works in the field of numerical simulation of the pumps are devoted to their optimization via changing some quite common parameters, not taking into account some effects like mentioned above. This work shows that usage of CFD can help to predict quite precisely such processes. The relevance of the study is quite high since the explored process can negatively influence the pump’s operation and cause damage of the unit.
{"title":"Investigation of vortex and hysteresis effects in the inlet device of a centrifugal pump","authors":"V. Lomakin, V. Cheremushkin, P. Chaburko","doi":"10.1109/GFPS.2018.8472374","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472374","url":null,"abstract":"The article is devoted to exploration of vortex and hysteresis effects in the inlet device of a centrifugal pump, which were discovered during the designing of a multistage pump. At present, many works in the field of numerical simulation of the pumps are devoted to their optimization via changing some quite common parameters, not taking into account some effects like mentioned above. This work shows that usage of CFD can help to predict quite precisely such processes. The relevance of the study is quite high since the explored process can negatively influence the pump’s operation and cause damage of the unit.","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":"130765519","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.2018.8472396
Daniel Roozbahani, Ikechukwu Kingsley Chima, R. Åman, H. Handroos
It is common knowledge of the world’s dependency on fossil fuel for energy, its unsustainability on the long run and the changing trend towards renewable energy as an alternative energy source. This aims to cut down greenhouse gas emission and its impact on the rate of ecological and climatic change. Quite remarkably, wind energy has been one of many focus areas of renewable energy sources and has attracted lots of investment and technological advancement. The objective of this research is to explore wind energy and its application in household heating. This research aims at applying experimental approach in real time to study and verify a virtually simulated wind powered hydraulic house heating system. The hardware components comprise of an integrated hydraulic pump, flow control valve, hydraulic fluid and other hydraulic components. The system design and control applies hardware in-the-loop (HIL) simulation setup. Output signal from the semi-empirical turbine modelling controls the integrated motor to generate flow. Throttling the volume flow creates pressure drop across the valve and subsequently thermal power in the system to be outputted using a heat exchanger. Maximum thermal power is achieved by regulating valve orifice to achieve optimum system parameter. Savonius rotor is preferred for its low inertia, high starting torque and ease of design and maintenance characteristics, but lags in power efficiency. A prototype turbine design is used; with power output in range of practical Savonius turbine. The physical mechanism of the prototype turbine’s augmentation design is not known and will not be a focus in this study.
{"title":"Experimentation on Wind Powered Hydraulic Heating System","authors":"Daniel Roozbahani, Ikechukwu Kingsley Chima, R. Åman, H. Handroos","doi":"10.1109/GFPS.2018.8472396","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472396","url":null,"abstract":"It is common knowledge of the world’s dependency on fossil fuel for energy, its unsustainability on the long run and the changing trend towards renewable energy as an alternative energy source. This aims to cut down greenhouse gas emission and its impact on the rate of ecological and climatic change. Quite remarkably, wind energy has been one of many focus areas of renewable energy sources and has attracted lots of investment and technological advancement. The objective of this research is to explore wind energy and its application in household heating. This research aims at applying experimental approach in real time to study and verify a virtually simulated wind powered hydraulic house heating system. The hardware components comprise of an integrated hydraulic pump, flow control valve, hydraulic fluid and other hydraulic components. The system design and control applies hardware in-the-loop (HIL) simulation setup. Output signal from the semi-empirical turbine modelling controls the integrated motor to generate flow. Throttling the volume flow creates pressure drop across the valve and subsequently thermal power in the system to be outputted using a heat exchanger. Maximum thermal power is achieved by regulating valve orifice to achieve optimum system parameter. Savonius rotor is preferred for its low inertia, high starting torque and ease of design and maintenance characteristics, but lags in power efficiency. A prototype turbine design is used; with power output in range of practical Savonius turbine. The physical mechanism of the prototype turbine’s augmentation design is not known and will not be a focus in this study.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"28 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":"133307190","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.2018.8472387
Daniel Roozbahani, Juha-Matti Herpiö, R. Åman, H. Handroos
The objective of this paper is to design and simulate a wind powered hydraulic heating system that can operate independently in remote places where the use of electricity is not possible. Components for the system were to be selected in such a way that the conditions for manufacture, use and economic viability are the as good as possible. Savonius rotor is chosen for wind turbine, due to its low cut in speed and robust design. Savonius rotor produces kinetic energy in wide wind speed range and it can withstand high wind gusts. Radial piston pump is chosen for the flow source of the hydraulic heater. Pump type is selected due to its characteristics in low rotation speeds and high efficiency. Volume flow from the pump is passed through the throttle orifice. Pressure drop over the orifice causes the hydraulic oil to heat up and, thus, creating thermal energy. Thermal energy in the oil is led to radiator where it conducts heat to the environment. The hydraulic heating system is simulated. For this purpose, a mathematical models of chosen components were created. In simulation wind data gathered by Finnish meteorological institute for 167 hours is used as input. The highest produced power is achieved by changing the orifice diameter so that the rotor tip speed ratio follows the power curve. This is not possible to achieve without using electricity. Thus, for the orifice diameter only one, the optimal value is defined. Results from the simulation were compared with investment calculations. Different parameters effecting the investment profitability were altered in sensitivity analyses in order to define the points of investment profitability. Investment is found to be profitable only with high average wind speeds.
{"title":"Simulation of Wind Powered Hydraulic Heating System","authors":"Daniel Roozbahani, Juha-Matti Herpiö, R. Åman, H. Handroos","doi":"10.1109/GFPS.2018.8472387","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472387","url":null,"abstract":"The objective of this paper is to design and simulate a wind powered hydraulic heating system that can operate independently in remote places where the use of electricity is not possible. Components for the system were to be selected in such a way that the conditions for manufacture, use and economic viability are the as good as possible. Savonius rotor is chosen for wind turbine, due to its low cut in speed and robust design. Savonius rotor produces kinetic energy in wide wind speed range and it can withstand high wind gusts. Radial piston pump is chosen for the flow source of the hydraulic heater. Pump type is selected due to its characteristics in low rotation speeds and high efficiency. Volume flow from the pump is passed through the throttle orifice. Pressure drop over the orifice causes the hydraulic oil to heat up and, thus, creating thermal energy. Thermal energy in the oil is led to radiator where it conducts heat to the environment. The hydraulic heating system is simulated. For this purpose, a mathematical models of chosen components were created. In simulation wind data gathered by Finnish meteorological institute for 167 hours is used as input. The highest produced power is achieved by changing the orifice diameter so that the rotor tip speed ratio follows the power curve. This is not possible to achieve without using electricity. Thus, for the orifice diameter only one, the optimal value is defined. Results from the simulation were compared with investment calculations. Different parameters effecting the investment profitability were altered in sensitivity analyses in order to define the points of investment profitability. Investment is found to be profitable only with high average wind speeds.","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":"124094831","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.2018.8472405
I. Malysheva, H. Handroos, V. Zhidchenko, A. Kovartsev
The problem of dynamics modeling of mobile machines that include hydraulic components is considered. The dynamic model should be built in a way that enables its faster than real-time calculation. The simulation results of such a model can be used in real-time tasks such as trajectory prediction, control and optimization. The dynamic model of hydraulically actuated mobile crane is developed and used as an example of the system in which dynamics is of great value for the system behavior evaluation. Several approaches for dynamic model construction are discussed and their features such as performance, accuracy and ease of use are evaluated. The performance of the developed models is estimated with respect to crane dynamic model built in commercial software. The advantages and disadvantages of every approach relatively to faster than real-time calculations are discussed.
{"title":"Faster than real-time simulation of a hydraulically actuated log crane","authors":"I. Malysheva, H. Handroos, V. Zhidchenko, A. Kovartsev","doi":"10.1109/GFPS.2018.8472405","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472405","url":null,"abstract":"The problem of dynamics modeling of mobile machines that include hydraulic components is considered. The dynamic model should be built in a way that enables its faster than real-time calculation. The simulation results of such a model can be used in real-time tasks such as trajectory prediction, control and optimization. The dynamic model of hydraulically actuated mobile crane is developed and used as an example of the system in which dynamics is of great value for the system behavior evaluation. Several approaches for dynamic model construction are discussed and their features such as performance, accuracy and ease of use are evaluated. The performance of the developed models is estimated with respect to crane dynamic model built in commercial software. The advantages and disadvantages of every approach relatively to faster than real-time calculations are discussed.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"67 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":"129317476","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.2018.8472370
J. Krawczyk, J. Stryczek
The article presents a construction solution of a gerotor pump in which the set of gears and body is made of plastic and the results of theoretical and experimental research of this pump. As the initial shape of the body, a square prism was assumed. It consists of three parts, i.e., the front, middle and back bodies, which are connected by screw connections. Using the excavate method, the basic shape of the body was formed within the outline of the initial shape. This shape was subjected to strength analysis using the FEM method. The purpose of these analysis was to determine the place, character and value of stresses and deformations of the basic shape body. These analysis have shown that the pump body deforms both in the axial direction, i.e., along the axis of the pump shaft, as well as in the radial direction, i.e., perpendicular to the axis of the shaft. In order to reduce the values of stresses and deformations, the basic shape of the body was modified to obtain a modified shape of the body. It was subjected to further strength analysis by the FEM method. The modifications have led to a reduction in the value of stresses and deformations. Using the modified shape of the body, a design of gerotor pump made of POM plastic was developed and its model was made. The pump with such a body worked correctly in the pressure range $p =$textbf 20 bar and rotational speed $n =$textbf 1000 rpm.
{"title":"Design and Experimental Research of a Plastic Gerotor Pump","authors":"J. Krawczyk, J. Stryczek","doi":"10.1109/GFPS.2018.8472370","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472370","url":null,"abstract":"The article presents a construction solution of a gerotor pump in which the set of gears and body is made of plastic and the results of theoretical and experimental research of this pump. As the initial shape of the body, a square prism was assumed. It consists of three parts, i.e., the front, middle and back bodies, which are connected by screw connections. Using the excavate method, the basic shape of the body was formed within the outline of the initial shape. This shape was subjected to strength analysis using the FEM method. The purpose of these analysis was to determine the place, character and value of stresses and deformations of the basic shape body. These analysis have shown that the pump body deforms both in the axial direction, i.e., along the axis of the pump shaft, as well as in the radial direction, i.e., perpendicular to the axis of the shaft. In order to reduce the values of stresses and deformations, the basic shape of the body was modified to obtain a modified shape of the body. It was subjected to further strength analysis by the FEM method. The modifications have led to a reduction in the value of stresses and deformations. Using the modified shape of the body, a design of gerotor pump made of POM plastic was developed and its model was made. The pump with such a body worked correctly in the pressure range $p =$textbf 20 bar and rotational speed $n =$textbf 1000 rpm.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"29 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":"114840400","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.2018.8472385
P. Stryczek, F. Przystupa, Michael D. Banas
Among the materials which are used to design modern machines, growth in participation of plastic materials can be observed. Also in hydraulics, more and more often elements of hydraulic systems or their components, which previously were made of metal, now are replaced with plastic ones. Taking into consideration the structural, technological and economic benefits resulting from the use of plastics in hydraulics, scientists from Fluid Power Research Group from the Department of Fundamentals of Machine Design and Tribology at Wroclaw University of Science and Technology, are working on the development of a complete hydraulic system in which the main elements, such as the cylinder, the valves and the pump, will be entirely or in significant part made of plastic. The article presents the design assumptions of a cylinders series made of plastics, research of prototype models performed in order to verify these assumptions, as well as conclusions and future research aims. The work on development of the series started with an analysis of the so far existing methods of designing hydraulic cylinders. On the basis of the metal cylinder design methods, own algorithm for designing cylinders made of plastics were developed in the form of a block diagram. Calculation carried out according to the algorithm allowed to determine the components in which it is possible to use plastic as a design material. The calculations were made for several variants of conceptual designs having similar features but different dimensions and operating parameters resulting from them. Similarities allowed for considering design variants as a series. Two variants of diameters, ø30 and ø50 were chosen as series representation, for which actual models of plastic cylinders were created. Models of cylinders were placed in sequence on a specially designed test stand which allowed for measurements operating parameters. A second, traditional cylinder made of metal was placed coaxially on the stand, in the way, that its piston rod was a load for the model. The examination was carried out according to the international standards- ISO 10100:2001(E). Recognizing the tests included in the standard as insufficient for a prototype made of material with untypical characteristics, additional tests were performed. Within additional tests, with use of optical displacement sensors, structural deformation measurements were made during piston rod movement, as well as tests of long-time operating of models were performed. Performed tests confirms the right direction in the approach to designing of hydraulic cylinders made of plastics.
{"title":"Research on series of hydraulic cylinders made of plastics","authors":"P. Stryczek, F. Przystupa, Michael D. Banas","doi":"10.1109/GFPS.2018.8472385","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472385","url":null,"abstract":"Among the materials which are used to design modern machines, growth in participation of plastic materials can be observed. Also in hydraulics, more and more often elements of hydraulic systems or their components, which previously were made of metal, now are replaced with plastic ones. Taking into consideration the structural, technological and economic benefits resulting from the use of plastics in hydraulics, scientists from Fluid Power Research Group from the Department of Fundamentals of Machine Design and Tribology at Wroclaw University of Science and Technology, are working on the development of a complete hydraulic system in which the main elements, such as the cylinder, the valves and the pump, will be entirely or in significant part made of plastic. The article presents the design assumptions of a cylinders series made of plastics, research of prototype models performed in order to verify these assumptions, as well as conclusions and future research aims. The work on development of the series started with an analysis of the so far existing methods of designing hydraulic cylinders. On the basis of the metal cylinder design methods, own algorithm for designing cylinders made of plastics were developed in the form of a block diagram. Calculation carried out according to the algorithm allowed to determine the components in which it is possible to use plastic as a design material. The calculations were made for several variants of conceptual designs having similar features but different dimensions and operating parameters resulting from them. Similarities allowed for considering design variants as a series. Two variants of diameters, ø30 and ø50 were chosen as series representation, for which actual models of plastic cylinders were created. Models of cylinders were placed in sequence on a specially designed test stand which allowed for measurements operating parameters. A second, traditional cylinder made of metal was placed coaxially on the stand, in the way, that its piston rod was a load for the model. The examination was carried out according to the international standards- ISO 10100:2001(E). Recognizing the tests included in the standard as insufficient for a prototype made of material with untypical characteristics, additional tests were performed. Within additional tests, with use of optical displacement sensors, structural deformation measurements were made during piston rod movement, as well as tests of long-time operating of models were performed. Performed tests confirms the right direction in the approach to designing of hydraulic cylinders made of plastics.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"14 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":"131010775","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.2018.8472377
T. Mironova, A. Prokofiev, V. Panova
The mathematical model of pipeline system with pressure pulsation damper under force excitation by oscillating fluid flow are developed. Pressure pulsation damper used in the model as a pipeline section with following features: mass per unit length and inertia moment of the damper cross-section more than mass per unit length and inertia moment of the pipe on one-two orders; the curvature of axial line very low; pressure and velocity pulsations in the damper are not produce its body vibration, or the vibrations less than pipe vibration on one order; the damper oscillations are consider like oscillations of rigid solid body. The mathematical model includes equations for vibroacoustical characteristics of the inlet and outlet sections; equations for dynamic of pressure pulsation damper; conditions for connection between damper and pipe; equations for distribution pulsations in space and time. The model allows to calculate acoustical, vibration and strength characteristics of pipeline system with pressure pulsation damper take into account fluid pulsation and vibration of pipe. The advantage of this model is interaction between alternating loading in a pipe and insertion attenuation of damper.
{"title":"The mathematical model of pipeline system with pressure pulsation damper under force excitation by oscillating fluid flow","authors":"T. Mironova, A. Prokofiev, V. Panova","doi":"10.1109/GFPS.2018.8472377","DOIUrl":"https://doi.org/10.1109/GFPS.2018.8472377","url":null,"abstract":"The mathematical model of pipeline system with pressure pulsation damper under force excitation by oscillating fluid flow are developed. Pressure pulsation damper used in the model as a pipeline section with following features: mass per unit length and inertia moment of the damper cross-section more than mass per unit length and inertia moment of the pipe on one-two orders; the curvature of axial line very low; pressure and velocity pulsations in the damper are not produce its body vibration, or the vibrations less than pipe vibration on one order; the damper oscillations are consider like oscillations of rigid solid body. The mathematical model includes equations for vibroacoustical characteristics of the inlet and outlet sections; equations for dynamic of pressure pulsation damper; conditions for connection between damper and pipe; equations for distribution pulsations in space and time. The model allows to calculate acoustical, vibration and strength characteristics of pipeline system with pressure pulsation damper take into account fluid pulsation and vibration of pipe. The advantage of this model is interaction between alternating loading in a pipe and insertion attenuation of damper.","PeriodicalId":273799,"journal":{"name":"2018 Global Fluid Power Society PhD Symposium (GFPS)","volume":"146 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":"134258758","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：