Design And Implementation Of A High Precision Hydraulic Generator Based On A Certain Hydraulic Pressure Log Test System

Hydraulic pressure log used to measure speed of a ship and accumulative total voyage is an essential component of the submarine navigation system. The log also can continuously provide real time speed and voyage information to other systems and equipments on the naval ship. In other words, the hydraulic pressure log is one of the most important instruments which determine submarine's security. A certain naval ship imported in 90's is entering repair cycle. The ship's equipments need to be executed mending intermediately, however, there aren't any necessary maintenance instruction documents about theЛГПhydraulic pressure log which is one important component of the naval ship's navigation system. There's also a lack of high precision testing equipments which are available for the in-factory dynamic repair. Meanwhile, the functional test for amplificatory circuitry board, debugging means and relational formulas for pressure sense organ ripple pipe can't be acquired. For meeting the requirement of in-factory repairing it's necessary to develop a testing system which may precisely control hydraulic pressure. The specific requirements include generating -10KPa to 100KPa dynamic-static pressure difference with 4MPa hydraulic pressure, keeping the precision in the scope of ±0.2KPa. Since the general existing solution can't meet the precision requirement, the study and design of a high precision hydraulic generator described in the paper are significant for repairing the log in the factory.Firstly, the principle to design a suitable hydraulic generator for the log based on analyzing the composition and fundamentals of hydraulic generator is described in the paper. Each important component of the generator has been analyzed, compared and chosen to be composed of the solution. Secondly, dynamic-static pressure measurement and signal amplification circuit which may tremendously affect the testing precision are discussed. Through the analysis and comparison of the circuit functional performance, the signal-collected circuit which has specific improvements has been addressed. Finally, according to universal test system requirements, took place in the hydraulic generator to complete the interface design and software interface design, to facilitate the unified management of the computer testing system.After going through the process of design, selection, assembly and debug, the solution can generate the given dynamic-static pressure difference and the stable hydraulic pressure at a depth of 300 meters. The dynamic-static pressure measurement and signal amplification circuit guarantees the success of high precision testing. The whole solution is proven to meet in-factory testing requirement for the log via practical verification.