Dynamic Analysis And Optimization Of WTZ350 Vehicle - Based Geophysical Prospecting Rig

With the depletion of oil and gas resources in eastern plain area and the transition of exploration target to Midwest hilly mountain terrain, it has been put forward higher requirements to the vehicle mounted geophysical rig in quantity and quality. The mast, an important part of the geophysical rig, is one of the most difficult in fabrication and design. Therefore, the reliability and safety of the mast is particularly important. Based on brand-new designing WTZ350geophysical prospecting drilling rig, calculations, analysis, verification and optimization on the problems that often occurred in practical engineering have been done.First, statics analysis of the derrick was made. Which consist of Equivalent static analysis in nine dangerous working conditions and the study of In-plane stability and Out-plane stability in most dangerous working conditions based on the energy method, the principle of potential energy, Rayleigh ritz method. It can be concluded that the derrick satisfies the requirements of strength, stiffness and stability.Then, the dynamic analysis of drill derrick was carried out. Which include modal analy sis and harmonic response analysis in six kinds of working conditions and transient respons e analysis in one condition. We got the vibration mode and natural frequency of the rig de rrick under various conditions, together with the stress, displacement, velocity and accelerati on under improving drilling conditions considering inertia and damping. Besides, verified th e safe operation frequency of drilling derrick.Next, via the whole rig derrick experiments weighted fatigue life analysis of the rig derrick in72kinds of working conditions, we obtained that the fatigue failure of the safety factor is4.9, satisfiing the requirement of fatigue life and the weak point of fatigue failure is in the bracket roller of power head.Last, based on the co-simulation of CREO and AWB, size optimization of Multi-objective genetic algorithm and shape optimization of the mast is carried out. In the case of little change in mass, the max displacement and stress of the mast decrease respectively by26%and33%via size optimization, which is verified by shape optimization.