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作动器活塞的有效面积 A_a 是电液伺服式振动试验台中最基本的结构参数,国内外通常选取最小活塞面积 A_(amiR)对 A_a 的比值等于2/3。但是无论从伺服伐工作效率最佳,或需要伺服伐输出的流量最小等准则出发,选取 A_(amin)/A_a=2/3是不合理的。本文对此进行了讨论和理论推导,建议对中频和低频液压振动台应选取作动器活塞有效面积增量系数α_(AOPT)=0.943,对谐振式工作的液压振动台应选取α_(AOPT)=ω_(anmin)/ω_w,对超越油柱谐振频率工作的高频液压振动台则需根据辅助约束条件选取“准最佳活塞面积增量系数α_(ASOPT)”。上述选择原则在作者多年从事液压振动台的研制工作中得到实际的应用并获得满意的结果。
The effective area of the actuator piston A_a is the most basic structural parameter in the electro-hydraulic servo vibration test rig. The ratio of A_ (amiR) to A_a is usually chosen to be 2/3 at home and abroad. However, it is unreasonable to choose Amin / A_a = 2/3 from the criteria of the best efficiency of servo cutting or the minimum flow of servo cutting output. In this paper, the discussion and theoretical deduction are made. It is suggested that the effective area incremental coefficient α_ (AOPT) of the actuator piston should be selected for the intermediate frequency and low frequency hydraulic shakers, and the value of α_ (AOPT) should be selected for the hydraulic shaker with resonance. = ω_ (anmin) / ω_w. For the high-frequency hydraulic vibrating table operating above the resonant frequency of the oil column, the “quasi-optimal piston area increment coefficient α_ (ASOPT)” needs to be selected according to the auxiliary constraint conditions. The above selection principle has been practically applied and has been satisfactorily achieved by the author in the research and development of hydraulic shaker for many years.