中文摘要：

研究2D高频转阀控制液压缸实现谐振疲劳试验新方法。提出2D高频转阀控制单出杆液压缸谐振疲劳试验方案，2D高频转阀阀芯可以双自由度运动，阀芯旋转运动可以控制系统激振频率，阀芯轴向滑动可以控制系统输出载荷力幅值，液压缸无杆腔初始容积变化可以控制系统谐振频率。建立2D高频转阀、单出杆液压缸和阀控缸系统的数学模型，建立阀控缸系统的 Simulink 非线性仿真模型，仿真研究液压缸无杆腔定初始容积时阻尼对系统输出载荷力幅频特性、相频特性和系统流量的影响，及谐振工况时载荷力波形失真度和载荷力幅值控制方法。试验结果验证了电液谐振疲劳试验新方法的可行性。该方案能有效提高电液疲劳试验的谐振频率，拓展电液高频疲劳试验机在工程领域的应用范围。

英文摘要：

Novel method of resonant fatigue testing achieved by two-dimension （abbr. 2D） high rotational valve controlled hydraulic cylinder is studied. Resonant fatigue testing scheme of 2D high rotational valve controlled asymmetrical hydraulic cylinder is proposed. Vibration frequency and amplitude of the fatigue test rig are controlled respectively by rotation and linear motion of the spool of 2D high rotational valve. The change of resonant frequency to the high frequency fatigue test rig is achieved by changing the initial position of the piston in the asymmetric cylinder. Mathematical models of 2D high rotational valve, asymmetrical hydraulic cylinder and the hydraulic system consisting of 2D high rotational valve controlled asymmetrical hydraulic cylinder are established. Nonlinear simulation model based on Simulink is used to study the impact of the damper on amplitude-frequency characteristics of the output load force, phase-frequency characteristics of the output load force and the flow rate, when the initial volume of the non-rod chamber of the asymmetric hydraulic cylinder is constant. And the waveform distortion of the output load force and the control method of the output load force amplitude are studied in the resonant working condition. Experimental results verify the feasibility of the novel method of electro-hydraulic resonant fatigue testing. The adoption of the scheme of 2D high rotational valve controlled asymmetric hydraulic cylinder can effectively increase the resonant frequency of electro-hydraulic fatigue testing and extend the application scope of resonant electro-hydraulic fatigue test rig.