电液疲劳试验系统加载策略研究

为更好地复现实际工程中物体所受的各种复杂载荷,提出一种基于相位控制的双激振器电液疲劳试验系统:应用流体动力学和系统动力学理论建立激振器与疲劳试验系统数学模型,非线性分析激振器激励-响应特性,拟定疲劳试验系统加载策略;最后搭建试验平台,验证理论分析的准确性及加载策略的可行性。研究结果表明:实测激振器输出力波形与仿真分析结果基本一致,所拟的3种加载模式可达预期目标,即疲劳试验系统能输出不同频率和极值的拉-压交变力、交变力矩和交变力偶矩满足试验需要。

Study on Loading Strategy of Electrohydraulic Fatigue Test System

In order to reproduce the complex loads that the object bears in the actual project, based on the phase control an electrohydraulic fatigue test system with two vibrators is presented. Mathematical models of exciter and fatigue test system were established with the theory of fluid dynamics and system dynamics. A nonlinear analysis of the excitation-response characteristics of the exciter was made, and the loading strategy of the fatigue test system was worked out. Finally, a test platform was built to verify the accuracy of the theoretical analysis and the feasibility of the loading strategy. The results show that the wave form of measured output force of the exciter is basically the same with the simulation results, and the proposed three loading modes can achieve the desired goal. That is, the fatigue test system can output tension-compression alternating force, alternating torque and alternating force moment with different frequencies and extremes to meet the needs of the test.