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一、在疲劳试验中由于对模拟以及工作条件准确再现的要求愈来愈高,这必然导致新型试验机即《电液伺服试验机》的发展。十年前,已经成功而稳定应用于飞机和火箭操纵系统的伺服阀在设计试验机时已经得到了应用。当时,随机程序试验只能在低负荷、高频率的电动激励器上进行。百分之九十九的试验为恒频率和恒振幅的威勒
First, in the fatigue test due to the simulation and the accurate reproduction of the working conditions of the higher and higher requirements, which will inevitably lead to a new type of testing machine that is “electro-hydraulic servo testing machine” development. Servo valves that have been successfully applied to aircraft and rocket steering systems ten years ago have been used in the design of testing machines. At that time, random program testing can only be carried out on low-load, high-frequency electric actuators. Ninety-nine percent of the trials were the Weiler with constant frequency and constant amplitude