Structural Parameters Optimization And Finnite Element Analysis Of Artificial Heart Pump Impeller

Cardiovascular disease has become a killer of human life,in the case of global deaths,cardiovascular disease patients accounted for 1/3 of the cases.By transplanting an artificial heart can assist or replace the ori ginal work of the heart,thereby solving the problem of donor shortage and waiting for the time of the donor,increases the chance of survival and reduces the cost of medical treatment.The existing artificial heart pump has the problems of large size,com plicated mechanical structure,easy infection,fever,complicated design process,low hemolysis,low efficiency,poor reliability and suspension stability.Bi directional hydraulic suspension of the artificial heart pump can be more effective to solve the above problems.In order to solve the problem of low efficiency,impeller running stability,hemolysis,hemolysis and reliability problems,and improve the design efficiency,using artificial heart pump hydraulic two-way suspension research design,simulation and optimization of reliability.In terms of human body blood condition and the advanced artificial heart pump design index,using the traditional experience design method,established a two-way hydraulic suspension of the artificial heart pump.A mult i-objective optimization mathematical model is established for the loss,stability and hemolysis.After giving each sub objective function with weights,unified objective function.Two algorithms are used to find the optimum in a given domain.By comparison,the relative ideal size parameter is chosen as the result of optimization,and then the function value of the initial value of each target is compared,and it is proved that the optimization is feasible in theory.According to the results of the optimization,the 3D solid model and the numerical calculation model are established.Through the simulation of the flow field in the artificial heart pump speed vector cloud,pressure cloud,whether the principle of working with the centrifugal pump is in line.Preliminary validation of the simulation method is reasonable.Based on the analysis of the comparison of the optimization results under different conditions,the rationality and correctness of the optimization are verified.The results are further analyzed,the reasonable using conditions of the artificial heart pump are determined,and the characteristics of the artificial heart are predicted.Based on finite element analysis of the impeller,we can get the stress and strain under the blood pressure and t he centrifugal force.The results show that the impeller made of the selected material can work reliably under the condition of the analysis.In this paper,the multi-objective optimization,optimization algorithm,numerical simulation and analysis technology are used to design and optimize the artificial heart pump impeller.Shorten the design cycle,saved the production cost,it has a great significance to optimize and design the artificial heart pump.