| The tide is turning and innovation is being sought in all fields,including hydraulics.In recent years,there have been two trends in the field of hydraulics: one is the approach of hydraulic components or the overall device towards the combination with the digital model to realize the digitalization of the hydraulic field;the other is the study of new structures of hydraulic components,thus seeking to combine hydraulic equipment with new components.Although hydraulic transformers have the advantage of small size and wide range of applications,they also have the problem of non-optimized structure of components in the device and difficulty of automatic control.Therefore,it is of rich significance and value to study the structural optimization of hydraulic transformers.The research in this paper is as follows.After reviewing the relevant literature,the development history and application prospects of hydraulic transformers at home and abroad are listed.Based on this,the research topic of this paper is proposed: topology optimization design and simulation study of key components of axial piston hydraulic transformers,based on the scientific research projects participated in the previous period,and the research contents related to this topic are listed.Analyze and study the working principle and system composition of the axial piston hydraulic transformer,derive the theoretical mathematical model of the axial piston hydraulic transformer based on its working principle,and provide the theoretical basis for the lightweight analysis of its key components.The main hydraulic components of this hydraulic transformer-the plunger and the flow distribution disc-are selected as the structure to be optimized,and the topology optimization SIMP method is used as the theoretical basis to establish the finite element model of the key components and define their boundary conditions and loads,and obtain the final topology optimization lightweighting results of the key components through the selection of the optimized and non-optimized domains and the application of relevant parameters.According to the topology optimization results,the original plunger and the original flow distribution disc are modified to obtain their lightened structures.Based on the stress-strain verification mathematical model,the thermal stress and strain,mechanical stress and strain,thermo-mechanical coupling strain,fluid pressure,fluid velocity and other characteristics of the plunger and flow distribution disc before and after the lightweighting are verified,and the reliability of the lightweighted structure is analyzed.For the design of the control of the power part of the axial piston hydraulic transformer,the PID control method is selected,the mathematical model and simulation model of the control part are established and designed,and the simulation results of the relevant characteristics of the hydraulic transformer are obtained through the setting of the relevant parameters,and the effectiveness of the control method is analyzed.Due to the limitation of experimental condition and time,the simulation test was done to compare the axial piston hydraulic transformer before and after the lightweighting,and the reliability of the axial piston hydraulic transformer after the lightweighting of key components was verified and analyzed from two aspects: modal analysis and transient pressure analysis,respectively.In summary,this paper proposes a lightweight topology optimization design for the key components of the hydraulic transformer,the plunger and the flow distribution disc,verifies the stress and strain of the lightweight components and the fluid parameters,designs the control method for the dynamic part of the overall structure and performs verification analysis,and finally verifies the reliability of the lightweight axial plunger hydraulic transformer.The results show that the research of this paper is reasonable and feasible,and lays the foundation for the subsequent research. |
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