| Seawater hydraulic is one advanced technology in ocean developing area. Itsprings up on the international because of its energy conservation and environmentprotection, the sustainable development, inexpensive and security etc. Seawaterhydraulic motor is an actuator component. To study it is of great significance to thedevelopment and popularization of seawater hydraulic drive technology.This topic aims to develop a seawater hydraulic motor with a rated torque of12.5Nm and a rated speed of1500rpm. Considering structure feature of traditionaloil piston pumps/motors and seawater hydraulic piston pumps/motors that have beendeveloped on the international, work on the research and improvement about thestructure, dimensions, materials and processing technology of motor according to thetechnical requirements of the national863plan project. As follows:(1) Analyze the probable structure differences between seawater and oilhydraulic piston motor according to the physical and chemical properties of seawaterand oil. Conduct further comparative analysis by consulting the acquired achievementof seawater hydraulic piston motor on the international so as to find the technicalproblem and acquire the comprehensive acknowledge of the motor.(2) According to the structure and technology requirements of the project,determine the structure form of this project base on considering the acquiredachievement of seawater hydraulic piston motor domestic and overseas. Take up thekinematics analysis and kinetic analysis for acquiring the kinematics properties andmechanical properties, so as to be the basis for structure designing and simulationmodeling of the seawater hydraulic motor later.(3) When the motor structure form has been determined, work on the calculatingand designing on the physical dimension and optimizing it. In addition, compare thematerials and make the choice for which to choose according the acquirement of theplan and structure of motor’s technology properties together with the successfulexample of seawater hydraulic motor on the international. Synthesize the structure dimensions and materials mentioned above, formulate the processing technology ofthe motor. Work on its3D modeling with PROE software and acquire the engineeringdrawing for its convenience to modify henceforth.(4) Model and simulation with AMESIM software according the acquired motorstructure dimension. Set up the parameters of simulation model on the basis ofdimension, medium and surroundings of motor. After it, analysis the workingcondition and output performance of motor under different swash plate angle,different flow input and load. Compare the simulation result and properties acquiredby the plan to analysis whether the design adjust to the requirements.(5) Process and manufacture the motor prototype according to the final drawing.Take tap water as the system medium instead of seawater. Separately work on theno-load test and load test. Separately analysis the properties and work stability underdifferent condition. Check whether the design satisfy the requirements.The simulation result outputted by AMESIM illustrates that the motor can workat a speed of1795rpm and output a torque of13.8Nm which indicates it satisfies thedesign requirements. And the volumetric efficiency also satisfies. The performancetrial of the motor prototype indicates that the torque export and the differentialpressure is linear correlation within15.7Nm, and never occur to instabilityphenomenon which illustrates that the torque and rotate speed can both satisfy therequirement. When the differential pressure trial exceeds10.16MPa, the torqueoutputted is11.06Nm, and the volume efficiency drop to0.805. It explains that thevolume efficiency cannot satisfy the requirement when motor output the rated torque.This is also the work need to be done in the future. |
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