Dissertation > Excellent graduate degree dissertation topics show

Research on Application of Reverse Engineering to Reverse Design of Closed Impeller

Author: LiuDongXia
Tutor: TangGuiJi；LiHongLin
School: North China Electric Power University
Course: Mechanical Engineering
Keywords: Reverse engineering Closed impeller Data acquisition Model reconstruction Solidworks CAE analysis
CLC: TH122
Type: Master's thesis
Year: 2011
Downloads: 75
Quote: 0
Read: Download Dissertation

Abstract

The mid-20th century, in order to digest and absorb the advanced technology of foreign products, and the complex surface parts detection requires the kind reverse engineering \This approach is to start from the existing physical model, the first measurement of three-dimensional digital model using the measured data, and reconstruct the CAD model of the kind, and then this model CAE analysis, improvement, innovation, and finally produce new products. This paper contains the complex inner cavity closed impeller, discusses the implementation of specific methods of operation of the reverse engineering. First introduced the forward closed impeller design methods, i.e., according to the performance parameters of the pump (flow rate, head, power, speed, etc.), calculate the coordinate values ??of the structural dimensions of the impeller and the vane type line, then plotted based on these data impeller axis plane projection and leaves cut in Fig. Forward design analysis methods know impeller before the height of the rear cover plate a series of points H and the radius R of the coordinate values, we can draw the axial faces of the impeller and the flow path projection view; determine a height value H axis vertical plane, and on this surface were measured in different angles on the shaft surface and the blade face and non-face intersection of the polar coordinate value (angle θ and the radius R), to draw the blade cutting pattern of the cylindrical coordinates. According to the actual situation of small and medium-sized manufacturing enterprises, the article describes the use of jig borer or coordinate milling and special flexible probe, universal electricity meter data acquisition tool closed impeller. The principle of this method of data acquisition and the coordinate measuring machine is the same, just with the the special elastic probe, universal meters and other tools, data measurement can be carried out within the impeller. By analyzing the functions and principles of the impeller, the planning of the a reasonable measurement area and measurement curve, that is only measured leaf turns Tao internal ago, after the the cover curve and the particular curve of the blade face and the non-working surface. Avoiding the general reverse obtained by the measurement point cloud \This article describes a reconstruction method based on the the Solidworks software impeller model to take advantage of the the Solidworks many curve function, the initial curve generated checks, analysis and correction; would stake out the the blades face and non-face get extended to the impeller front and rear cover, and equidistant surfaces to obtain intersects the surface of the blade with front and rear cover, the blade and the front and rear cover seamless integration to facilitate the follow-up quality, volume measurement and CAE analysis; read through the file into the curve of the three-dimensional coordinates of points, you can achieve the vane type line parameter-driven design approach to facilitate modifications or innovative design of the impeller. Solidworks Flow Simulation software reverse reconstruction impeller fluid analysis. The velocity distribution diagrams and static pressure distribution analysis results obtained by numerical simulation of the flow field inside the impeller, the impeller inside. Can be drawn from the distribution pressure of the liquid at the impeller exit and speed values, can be converted according to the pressure value of the head of the impeller, the flow rate of the impeller can be converted according to the speed value, and according to the difference between the pressure and flow data of the impeller ago , calculate the efficiency of the impeller. These values ??with the corresponding parameter of the original sample impeller compared in order to verify the consistency of the reconstruction of the impeller of the impeller and the original sample, it is judged whether the reverse engineering success.

Related Dissertations

CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical design, calculation and mapping > Mechanical Design
© 2012 www.DissertationTopic.Net Mobile