| The deep-sea hydraulic system is an important component of deep submersibles,with characteristics such as reliable transmission and high power to mass ratio.It needs to adapt to the working conditions of high deep-sea environmental pressure and large temperature changes during the diving process.To prevent external seawater from entering the hydraulic system and causing malfunctions,it is necessary to ensure that the return oil pressure is slightly higher than the external seawater pressure.Therefore,a compensator is needed to compensate for the deep-sea hydraulic system.The compensator is the core component of the deep-sea hydraulic system,which not only introduces seawater pressure into the hydraulic system,avoiding the use of pressure resistant structural design for components,thereby reducing design difficulty and improving energy utilization,but also compensates for changes in hydraulic oil volume caused by changes in environmental pressure,temperature,and other factors.The performance of the compensator determines the depth at which a deep submersible can dive.The greater the diving depth,the higher the requirements for compensation performance and anti-interference performance of the compensator.This article investigates the compensation characteristics of deep-sea hydraulic systems under wide temperature range conditions,and designs a rolling diaphragm type compensator with adaptive pressure compensation characteristics applied in a 2000 meter deep-sea hydraulic system.The specific research content is as follows:The first part first studies the compensation volume model of the compensator.On the basis of existing solving models,considering the coupling effect of environmental temperature and pressure,the solving model was optimized,and the rationality of the optimized model was verified through simulation using AMESim software.The optimized model can not only calculate more accurate initial compensation volume values,but also simulate the changes in compensation volume with sea depth,providing a theoretical basis for the optimization of compensator structure,mass reduction,improvement of energy utilization efficiency,and in-depth research on compensation pressure.Then,from the perspective of engineering applications,the No.10 aviation hydraulic oil used in the deep-sea hydraulic system was tested,and a compensation volume solution model based on the No.10 aviation hydraulic oil was established.The second part studied the compensation pressure characteristics of the compensator.A mathematical model for compensating pressure was established by analyzing the force acting on the rolling diaphragm compensator and calculating the flow continuity equation.The steady-state and dynamic characteristics of compensation pressure under the individual effects of environmental temperature,environmental pressure,and flow rate of asymmetric actuators were studied using Matlab software.Then,based on actual operating conditions,the fluctuation of compensation pressure under the combined action of the three was analyzed.The results indicate that measures such as reducing the initial compensation volume,increasing the equivalent force area of the rolling diaphragm,and reducing the quality of the compensator membrane frame components can reduce the fluctuation of compensation pressure and improve the anti-interference performance of the compensator.The third part conducts further analysis and research on the function and performance of deep-sea hydraulic system compensators from the perspective of engineering practice.Firstly,a simulation model of a 2000-meter deep-sea hydraulic system was built in AMESim software,and the working performance of the deep-sea hydraulic system after compensation under the combined action of environmental temperature and pressure was analyzed.Then a rolling diaphragm type compensator was designed and finite element simulation analysis was conducted using ANSYS Workbench software.The results showed that the structure of the compensator met the strength requirements.Finally,based on the above analysis,suggestions were made for the optimization design of deep-sea hydraulic systems and their compensators. |
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