Analysis Of The Static, Dynamic Character And Optimization Of The 960KW Drilling Pump Crankshaft

960kw drilling pumps are used as the most popular pumps in the markets.The crankshaft is the key part of drilling pump, which is also the base of the whole pump. Many pump parts are associated by the crankshaft to its position, and the crankshaft is bearing of loads of inside and outside of the pump. If its structure is unreasonable, the pump will be vibration and fracture. So the static characteristics and dynamic characteristics of the crankshaft is the groundwork of design, improvement and optimization of pump structure, which is one key of ensuring better performance of the whole pump.In this paper, a kind of crankshaft is taken for the research object,and also argument and analysis questions about foce ,strength, stiffness, vibration and structural optimization. Mainly research contents are as follows:1) according the requested of drawings,obtained basic parameters,basiced these parameters ,caculated force and moment on the crankshaft .including force given by piston rod ,inertia force,radial force and tangential force on crankshaft given by connecting rod,circumferential force and moment given by big gear.2) When establishing the three-dimensional model of the crankshaft, by way of modeling directly in ANSYS10.0 and by way of inputing from pro/e software that solves the missing problems . Under the premise of ensuring fully reflect the actual structure of the mechanical properties and the structure of the frame model, simplifing the model to save significant computing time. Under the premise of analysis unit in the quantity, quality, layout with a solid element SOLID95 on the whole discredited body, and then the finite element model of the crankshaft is founded.3) In the static analysis, the maximum deformation and stress on the crankshaft are found, the stress nephogram and displacement nephogram of the crankshaft are also calculated. So it can get the dangerous position of the crankshaft.4) In the dynamic analysis, which includs modal analysis and harmonic analysis. In modal analysis , the natural frequencies and mode shapes of the crankshaft is obtained under constraint condition. The max amplitude and their corresponding range of frequencies for different point at cycle incentive of the rod are determined through the harmonic analysis. Above all provided reference information for improving the crankshaft design.5) Parametric modeling crankshaft is conducted and also using optimization model in ANSYS10.0 software to optimize the crankshaft by seeing the crankshaft horizontal, longitudinal cross-sectional dimensions as design variables, deformation asthe constraints condition and the total volume of the crankshaft as objective function. Get the optimal values of the crankshaft to reduce the quality of the crankshaft .