Research On Hydraulic System For Ro-ro Terminal Automotive Steel Bridge Approach

Ro-ro terminal automotive steel bridge approach is a part of the ro-roterminal connection with auto ro-ro, as the automotive ro-ro ship’s hull isrelatively large, so steel bridge’s size designed in this article is greater than thegeneral approach spans of the body. The rising and falling of the steel bridgeapproach is controlled by controlling the telescopic of the hydraulic cylinderswhich are hanging on the gantry. The hydraulic system and electrical system arethe core system of steel bridge approach. This paper mainly studies the hydrauliccontrol system of the steel bridge, the hydraulic cylinder is the implementation ofthe components of the whole system. Controlling the stability in the movementprocess on hydraulic cylinder to maintain the smooth steel bridge approach’s lift;Steel bridge approach and ro-ro are connected well by effective control ofhydraulic cylinder telescopic precision.For this research of the hydraulic system is the system with valve controlledasymmetrical cylinder. The mathematical model of the hydraulic system includesflow continuity equation about valve, flow continuity equation with valvecontrolling cylinder and load force balance equation for valve controllingcylinder by the inspection of the literature, After taking some simplifiedconditions to the hydraulic system, a mathematical model for hydraulic systemon the steel bridge approach shore section and boat segment are created.According to the mathematical model, modeling and simulation are performed onMatlab/Simulink software. Then some problems in the system are identified bythe simulation curve analysis. PID controller is added to allowing the system toachieve desired requirements by adjusting the parameters of it. However thesystem is overshooting and vibratory due to the limitations of the conventionalPID controller. So the fuzzy self-tuning PID controller is used in this article to regulate the system, then overshooting and vibration is reduced in the system.The last is the co-simulation of the system and then verify the reasonableness ofthe control system through the comparison between the control system with nocontroller and the control system of the plus PID controller comparative analysis.The research on the hydraulic system lined with the actual projectrequirements according to simulation analysis of the system, thus the rationalityof the system design and control programs are reasonable. This research providesa new way to design the steel bridge approach of the large pier, which can be acertain reference hydraulic control study and optimization of the steel bridgeapproach.