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本文给出了电液伺服材料试验机的比较完整的动态数学模型,应用线性控制理论,采用电子数字计算机和模拟计算机分析其负荷,变形、位移等三条反馈回路的频域特性和时域特性,讨论了各种因素,对系统动态性能的影响。着重分析了试验机各部分的结构刚度以及试件刚度对系统动态性能的影响。进而提出系统动态分析的简化数学模型,导出若干重要特征参数的计算公式。为同类试验机的动态设计与分析提出简化方法,对系统的参数选择、设计、调试提出意见。最后还讨论了伺服阀流量饱和非线性因素的影响。图18张,表2个,参考文献13种。
In this paper, a relatively complete dynamic mathematical model of electro-hydraulic servo material testing machine is given. By using linear control theory, the electronic and digital computer and simulation computer are used to analyze the frequency and time domain characteristics of the three feedback loops such as load, deformation and displacement. Discussed the various factors, the impact on system dynamic performance. The structural rigidity of each part of the testing machine and the influence of specimen rigidity on the dynamic performance of the system are analyzed emphatically. Then a simplified mathematical model of the system dynamic analysis is proposed and the formulas of several important characteristic parameters are derived. Put forward a simplified method for the dynamic design and analysis of similar testing machines and put forward opinions on the system parameter selection, design and debugging. Finally, the effect of non-linearity of servo valve flow saturation is discussed. Figure 18 Zhang, Table 2, 13 kinds of references.