Optimization Design of Disc Spring for Hydraulic Oscillator

Abstract

During drilling, hydraulic oscillators are commonly used to reduce the friction and resistance of the drill string. However, the disc springs in the oscillator's short section can easily fail with increased service time. In this study, our aim was to improve the performance of the disc springs used in the oscillator's short section by optimizing their design through response surface methodology. Using numerical and simulation techniques, we analyzed the mechanical properties and lifespan of the disc springs. We determined the optimal direction for the disc spring's geometric structure using national standard algorithms. We established a parameterized model with thickness t and inner cone height h0 as design variables and aimed to minimize stress, directed deformation, and maximize durability. As a result, we obtained the optimal structural parameters under the design conditions. The optimized disc spring reduced the maximum stress by 45.9%, with directed deformation accounting for 35.8% of the working stroke and achieving a minimum fatigue life of 154 hours. The use of the optimized disc spring improved the service time of the hydraulic oscillator, providing valuable insights for the optimization of disc springs in hydraulic oscillators.