电液双阀激振系统振幅增益特性实验研究

Experimental Study on the Gain Characteristic of Amplitude in Dual-valve Electro-hydraulic Servo Excitation System

电液伺服激振系统可为振动拉削工艺提供较大的激振力,其中双阀并联可通过补偿流量,在激振频率与激振振幅间取得平衡,但其振幅增益变化的不可预测性较大.针对上述问题,以双伺服阀并联为研究对象,采用阀缸一体式的电液双阀激振器进行激振实验,通过分析Matlab/Simulink仿真计算结果和实测结果,研究了电液双阀激振系统有效振幅增益变化的规律特性.多组交叉式实验及结果分析表明:双阀并联结构可以使通用电液激振系统的位移输出幅值范围得到显著提升.但该结构并非单阀系统的简单合并,由于激振过程中多通道汇流扰动作用的不断加剧,激振频率和阀芯开口量的变化量也随之增大,其有效位移输出增益在50%~70%之间浮动.

The electro-hydraulic excitation system(EHES)has an ability to equip the vibration broaching with a greater exciting force.And the dual-valve system achieves equilibrium through flow compensation.Nevertheless,the large unpredictability of its amplitude gain could exist.For the questions above,as to the research object,the dual-valve vibration exciter is integrated by two servovalves and single hydraulic cylinder and adopted into the excitation experiment.Comparing the numerical simulations analysed by MATLAB/Simulink software with the experimental results,the regularity of effective amplitude gain of EHES could be understood.Several groups of crossexperiments and analysis show that the adoption of doubling the servo-valves in EHES has a remarkable effect on the range expansion of gain characteristic of amplitude. However,this incorperative action of two valves is not the same as the simple superposition.On account of the aggravated multi-channel confluence disturbance,the excitation frequency and core opening could be increased in the meanwhile.And the effective displacement output gain is in the range of 50%and 70%.