A Static And Dynamic Analysis And Structural Optimization Of The Frame Of High Power Cementing Truck

A cementing truck is a petroleum equipment truck used to perform cementing operations in an oilfield.Compared with the conventional cementing truck,the on-board equipment of the super-large power cementing truck is heavier,and the impact load generated by the plunger pump is larger during operation.According to work requirements,it is necessary to drive on relatively harsh road conditions for a long time.As the main bearing component,the frame should have enough rigidity,strength and good dynamic performance to ensure the safety and stability of the whole truck.In this paper,the super power cementing truck frame as the research object,the finite element method is used to study the strength,stiffness and stability of the frame under static and dynamic loads,and based on the structure optimization design theory and method,the structure topology optimization,size optimization design.Firstly,the subframe of the original cementing truck was modeled in 3D,and then the finite element modeling of the frame was completed by simplifying and meshing.The static strength analysis of the frame was carried out by studying the test procedures of automobile shaping and consulting relevant engineers.In this way,the bearing capacity of the frame under different working conditions can be obtained to determine whether there is room for optimization.The natural frequency of the frame was extracted by modal analysis,and the harmonic response of the simple harmonic vibration force generated by the plunger pump was analyzed to understand the vibration characteristics of the frame.Secondly,the Optistruct optimization module of Hyper Works,a structural optimization software,was used to optimize the topology of the frame based on SIMP variable density method.Based on the topology optimization results of single working condition and single objective,a mathematical model of multi-objective and multi-working condition topology optimization was established based on compromise programming method,and the weight factors of each objective were determined by AHP.The topology optimization results of minimizing the flexibility of the frame under various static conditions and low-order dynamic maximization can be obtained,and then the frame model can be reasonably reconstructed according to the obtained material distribution nephogram.Finally,SolidWorks is associated with Workbench to parameterize the required variables in the model.The allowable stress value,allowable displacement value and loworder natural frequency were used as state variables for the new frame,and the optimization objective was set by minimizing the mass.The parameters of the size of the beam and connecting plate and the layout position were used as design variables for parameter optimization.Based on this,the design of the subframe of the new cementing truck is completed.After checking the static and dynamic characteristics of the new frame,it is found that its stiffness,strength and low-order bending frequency have been improved to a certain extent,and its mass has been reduced.The lightweight design of the cementing truck subframe has been completed.