Reliability Analysis Of Hydraulic System Of A Robot

Artillery automatic loading system has undoubtedly become an important branch of modern artillery technology. Due to automatic ammunition loading system is essential to the rate of fire of artillery weapons systems and the power of artillery weapons, it also changed the traditional structure of artillery and combat mode. Therefore, the reliability of the system is necessary to study.The main reliability indicators of reliability are failure rate,the average life expectancy etc. The main object of this study was to analyze the reliability of automatic loading manipulator hydraulic system. Driven by hydraulic system, the robotic arm rotates around the trunnion, completing automatic loading. The rotating accuracy and rotation speed of the system have a great impact on the major moves. The hydraulic system dynamic reliability analysis of artillery automatic loading was using a Stochastic Petri Net method. First a network diagram was drawn, and then the correlation matrix and the equation of state were calculated, and finally Minimal Cut Sets method was used to calculate the dynamic reliability degrees.After completion of the dynamic reliability studies, moving reliability analysis for hydraulically driven manipulator was studied. ADAMS/Hydraulic software for hydraulic systems was used to establish a mechanical arm coupled model. By setting different parameters for each hydraulic components, the abnormal work curve of mechanical arm were obtained, in contrast with normal working curve.Of several simulation parameters results, three most important influence factors: temperature、leakage、the opening degree of the main valve were obtained. Since the three main factors are random variables, so we need to assume their probability distribution. The sampling value of the uncertainty variables were obtained based on the description sampling method. In order to reduce the sampling frequency, a response surface method was used. Using polynomial fitting take the place of the random variable and the response relationship. After dozens of simulation, limit state surface was obtained. The curved surface was used to execute Monte Carlo simulation for hundreds of times, finally the hydraulic driven mechanical arm positioning reliability value was obtained.