| Gammarays are extremely short wavelength of high energy electromagnetic waves. The energy released in the process of ionizing radiation could change the attribute of material.In the high radiation environments, electromagnetic waves generated by 60Co-γ rays will aggravate the aging of hydraulic medium, causing hydraulic pipeline rupture, valves and pipe joints and other original and instrument damage, seriously affecting the physical properties of the medium and its effects on the dynamic characteristics of hydraulic system. Especially density, viscosity, elastic modulus and other factors of hydraulic medium affect the pressure loss caused pipeline in the process of transmission, limiting the efficiency and stable performance of engineering machinery hydraulic system under high radiation environment, restricting the application and development of engineeringmechanical under high radiation environment.This article by hydraulic oil of excavator for object of study, Fromexperimental and AMESim simulation study on the three layers after exposure to physical characteristics of hydraulic medium, consideringoutput displacement, pressure and flow characteristics of hydraulic system of Irradiation hydraulic medium viscosity change, the main Research from the following aspects:1.Research in Gamma-ray radiation dose rate 2k Gy/h, 50,100,200 k Gy irradiation dosages has the influence on hydraulic oil kinematic viscosity, pour point, acid and other physical and chemical indicators. Results showed that: with irradiation dose increased, kinematic viscosity of hydraulic oil increased slightly, so irradiation dose had little influence on movement viscosity of hydraulic oil; with irradiation dose increased,the pour points of hydraulic oil reduced, that means irradiation makes hydraulic oil of cryogenic liquidity became better; irradiation dose on acid of hydraulic oil effects larger, with irradiation dose increased, the acid of hydraulic oil increased sharply; with irradiation dose increased, the chromes of hydraulic oil increased, the light transmittance became worse.2. Through continuous anti-emulsion performance determination method, combined hydraulic oil points water speed, points water rate, appearance of points water oil, oil interface state and other indicators research’sresults showed that: on three species hydraulic oil anti-emulsion performance for integrated evaluation, found in irradiation dose for 2k Gy/h, irradiation dose for 50, and 100 k Gy, no caused injury irradiation on hydraulic oil of anti-emulsion performance, A hydraulic oil in 50 k Gy, water rate reached 100% in 15 min,B hydraulic oil in 100 k Gy, rate water reached 97.5% in 15 min, anti-emulsifying properties improved. The demulsibility of hydraulic oil was lost, When the radiation dose for 200 k Gy.3. Change the kinematic viscosity of hydraulic oil by irradiation experiments, and use AMESim to establish hydraulic positioning system simulation model considering the effect of pipeline, Study on pipe affect what caused by hydraulic oil viscosity, length of pipe and diameter of pipe how to affect the dynamic characteristics of hydraulic system. Research shows that single factor of kinematic viscosity change has little effect on the dynamic characteristics of a pipeline, with the increase of pipe length and diameter, the impact intensified. |
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