| 摘要 |
FIELD: testing technology; checking units and lines of space vehicles located on their outside. SUBSTANCE: space vehicle is placed in vacuum chamber connected with leak detector. Interior of vacuum chamber is brought in communication with interior of compartment. Vacuum chamber and compartment are evacuated by means of evacuation facilities of vacuum chamber to limiting residual pressure in vacuum chamber. Calibrated flow of test gas at preset value is fed to vacuum chamber. Change of concentration of test gas ΔCin vacuum chamber due to calibrated flow is measured, after which supply of test gas is discontinued and this calibrated flow is fed to compartment. Change in concentration of test gas in compartment ΔCdue to calibrated flow is measured. Ratio of partial pressures of gas in compartment is changed to magnitude at which change in concentration of test gas in vacuum chamber ΔCdue to calibrated flow fed to compartment will be equal to change in concentration of test gas in vacuum chamber ΔCdue to calibrated flow fed to vacuum chamber. Ratio of partial pressures thus found is recorded, after which supply of calibrated flow of test gas to compartment is discontinued. Pneumohydraulic system is filled with test gas. Maintaining the recorded ratio of partial pressures of gases in compartment at constant level, change in concentration of test gas in vacuum chamber due to microleaks in units and lines of pneumohydraulic system is measured. Relationship of measured changes in concentration of test gas is indicative of tightness of pneumohydraulic system. EFFECT: enhanced accuracy of test. 2 cl |
