弦振动筛网振动特性分析OA

As drilling depth increases,the presence of ultra-fine particles and the complexity of drilling mud make solid-liquid separation more challenging.To overcome the low dewatering efficiency and persistently high solid-phase moisture content of ultra-fine drilling mud,a mud filter cake detachment method based on a string-vibrating screen is proposed in this study.By applying a single excitation source to the screen to induce string-type vibration and resonance,the filter cake is effectively assisted in detaching from the screen surface.A string vibration model of the screen is established to analyze its amplitude,acceleration,and stress-strain characteristics under different excitation frequencies.The results indicate that the transverse amplitude fluctuation of the screen exhibits a parabolic trend with frequency,with an amplitude fluctuation range of-8.02 to 9.62 mm at 50 Hz,which is 92.4%higher than that of traditional shale shakers.The longitudinal displacement amplitude of the screen fluctuates markedly as a function of excitation frequency,with multiple amplitude peaks emerging in the 40-50 Hz range and the extreme values being concentrated near the lateral positions of the screen.Furthermore,the screen velocity and acceleration are highly sensitive to frequency;within 40-50 Hz,the positive and negative velocity fluctuations become strongly asymmetric,resulting in substantially higher particle acceleration and,consequently,more efficient detachment of the drilling mud filter cake.