Optimization Design And Vibration Analysis Of Double Suction Centrifugal Pump

Pump products are widely used in our production and life,which means a lot of energy consumption.It is people’s demand to make pump products run efficiently.In addition,with the development of The Times,people have higher and higher requirements on the working environment.Therefore,high efficiency and low noise have become important indexes to evaluate the merits and demerits of products.In the process of pump product research,the structure usually designed by designers may be limited to meet the requirements of product performance parameters,but often not meet the best performance of the product.In order to find products that meet the design parameters and have the best performance,this article builds an automated optimization platform which can find the products that meet the best performance under the current design parameters,and compares the double suction pump models before and after optimization.In order to achieve this goal,the work of this article is mainly divided into the following contents:(1)Parametric modeling of the impeller.After completing the parametric modeling,this article build an automated simulation and optimization platform under the workbench platform.Using the best space filling design method to generate 151 design points.This were done in the optimization simulation platform.When it completes simulation calculation of the design points,the Kriging response surface model was selected to construct a preliminary response surface model based on these 151 design points.The response surface model was continuously refined through 91 refinement points to improve the accuracy of the response surface.The mixed integer sequence quadratic programming optimization method and multi-objective optimization method are used to perform iterative optimization in the response surface,and the found optimization results are numerically verified.(2)The flow field results of the double-suction pump impeller before and after optimization are compared and analyzed to prove the correctness of the optimization.This paper makes a comprehensive and multi-angle comparison of issues such as external characteristics,internal flow field,local Euler head,entropy production,pressure fluctuation and radial force.The results show that the optimized double-suction pump has more uniform flow in the impeller,less loss in the flow channel,and smaller fluctuation amplitudes of pressure pulsation and radial force.(3)Combined the results of fluid calculation,this article completes the one-way fluid-solid coupling calculation,and calculates the prestressed modes of the solid structure of the impeller and the pump body.The results show that the natural frequency of each order mode of the structure and the characteristic frequency of the fluid excitation force have a certain gap which indicates the structure will not resonate when fluid excitation load on structure.Combined with the results of radial force analysis,the sinusoidal excitations at different frequencies were extracted and loaded on the impeller,and the vibration acceleration amplitude of the impeller after optimization was reduced.The radial force is loaded on the surface of the volute,and the analysis results show that the amplitude of vibration acceleration on the pump body is greatly reduced after optimization,which further proves that the optimization result is reasonable.