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前言国内外传统的高频疲劳试验机都是采用正反馈使系统产生自激振荡,而利用实际动载荷的大小与给定值比较,产生的误差电压去控制正反馈的强弱。即利用负反馈去稳定动载荷的幅度。其实质是控制送到激振器的激励功率(或电压)的大小,以达到控制和稳定动载荷幅度的目的。对于这类控制系统我们称之为幅度调制型的系统。国外七十年代后期出现了一种与
Preface At home and abroad, the traditional high-frequency fatigue testing machine adopts positive feedback to make the system generate self-excited oscillation. However, the error voltage generated by the actual dynamic load is compared with the given value to control the positive feedback. That is to use negative feedback to stabilize the dynamic load range. Its essence is to control the excitation power (or voltage) sent to the exciter in order to achieve the purpose of controlling and stabilizing the dynamic load amplitude. For this type of control system we call the amplitude modulation type system. Abroad in the late seventies appeared a kind and