Abstract
Due to the sweep excitation of the vibrator, the dynamic stiffness of the seismic vibrator has an enormous influence on the performance of the vibroseis system and the accuracy of the output signal. In order to improve the dynamic stiffness of the vibrator, an optimization strategy is presented to improve the weak link which is defined by dynamic analysis of the vibrator. The weak link is the weakest part, which brings about the resonance, and the weak link in different excitation frequencies is identified by dynamic stiffness analysis in this method. A modified finite element model with reaction mass is built; harmonic response analysis and modal analysis are employed to find out the weak link of the vibrator, which indicates that the supporting column is the weakest component. Sensitivity analysis is used to determine the optimization parameters of the supporting column. Response surface model developed from a parametric finite element model is used to establish the objective function, and the mass is the constraint condition. The optimization problem is solved by particle swarm optimization, and the dynamic stiffness of the optimized vibrator is calculated by harmonic response model. Results show that compared with the original model, the natural frequency of the optimized vibrator is increased by 6.63% and the resonance peak is decreased by 9.00%.
Highlights
Seismic vibrator is widely used in gas and oil exploration due to high efficiency and environmental protection
Researches have proved that the stiffness of the vibrator baseplate is one of the main reasons which limit the performance of the vibrator.[1,2,3,4,5]
particle swarm optimization (PSO) algorithm is employed to solve the optimization problem, and the optimal solution is verified by the finite element model built by ANSYS software
Summary
Seismic vibrator is widely used in gas and oil exploration due to high efficiency and environmental protection. Due to the increase in the exploration demand, high precision and wide bandwidth are the main development trends of the seismic vibrator. The study of performance of the vibrator has always been an area of research interest. Researches have proved that the stiffness of the vibrator baseplate is one of the main reasons which limit the performance of the vibrator.[1,2,3,4,5] For example, Baeten and Ziolkowski[6] proposed a model to account the flexion of the baseplate, and the model showed that the baseplate stiffness is mainly of importance at high frequency.
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