Research On Matching Performance For Pump-Pipeline System Of Cutter Suction Dredger

Cutter suction dredger is one of the most important dredging equipment which is widely used in dredging engineering.As a part of dredger,pump-pipeline system is one of the most important energy consumption parts,whose matching performance has great influence upon the efficiency of slurry transportation and the safety of construction.The research on matching performance is mainly focused on two aspects: one is the optimization of the working conditions,the other is automatic research of calculation for working condition point.To solve the difficulty of calculating optimum working condition point when the external environment changes,according to the actual conditions of dredging construction,the study on the characteristics of slurry,modeling of pump-pipeline system,working condition optimization scheme,software design and the comparison of construction data are proceeded.Specific research methods and results are summarized as follows:(1)Based on the characteristics of slurry,a mathematical model for matching of pump-pipeline system was established.Using the MATLAB simulation software,the simulation models which the slurry velocity,slurry concentration and pump speed as the dynamic variables are established.Analyzed the influence of different working point optimization methods on the working condition of pump-pipeline system.When the other influencing factors is constant,keeping the velocity of flow at critical velocity can significantly improve the efficiency of the dredging;when the slurry concentration increases,the yield of dredging will increase,and the energy consumption will decrease first and then increase.When the speed changes,the yield of dredging and energy consumption will change,and this change depends on the specific working conditions.(2)Based on the study of differential evolution algorithm,it put forward a method based on differential evolution algorithm,which takes aim at optimization of working condition.Taking a cutter suction dredger with standard yield of 4500 cubic meters as the object.Comparing traditional working point optimization method with the proposed optimization method under different conditions.The simulation results show that in the case of small range and low precision,both of methods can calculate the optimal working point in a short period of time;but in the condition of large range and high precision,the method based on differential evolution algorithm is obviously superior to traditional one.(3)On the basis of the method based on differential evolution algorithm,the matching software of pump-pipeline system is developed by using Visual Studio.According to the data of "Chang Shi X" cutter suction dredger's pump and pipeline,established a project named " Chang Shi X" in the software.Compared different resistance loss and critical velocity formulas by using "Formula management" interface,the results show that Chen Guangwen resistance loss model and Durand critical velocity model are more suitable for "Chang Shi X" cutter suction dredger's working point calculation,compared the results with construction data to demonstrate the effectiveness of the software.