轴向加荷疲劳试验机动态力校准的研究

研究了电液伺服式和电磁谐振式两类疲劳试验机，在对其力学模型振动分析的基础上，得到了两类试验机动态力值误差的解析表达式。分析了影响惯性力大小的主要因素，如工作频率、连接夹具或试样的质量、刚度等，进行了多组比较试验，对理论分析结果进行了验证。讨论了疲劳试验机动态力误差的修正，并对校准装置和夹具的选择提出了建议。

关于《轴向加荷疲劳试验机检定规程》的几点说明

原航空工业部批准颁发的JJF(航空)019-85《轴向加荷疲劳试验机验定规程》已于1986年2月1日在部系统内开始施行,这个规程的颁发表明该类试验机的计量检定在航空工业系统内已纳入了计算管理轨道。现将有关技术问题作如下说明。

轴向加荷疲劳试验机动态力校准装置的性能研究与应用

介绍了一种用于轴向加荷疲劳试验机动态力校准的校准装置。该装置包括由轮辐式和实心柱式两类电阻应变式力传感器组成的标准力传感器和PXI-4220型双通道应变测量系统。分别采用正弦力标准装置、冲击力标准装置和敲击法对标准力传感器的动态特性进行试验和研究。采用标准信号源对PXI-4220数据采集系统的动态特性进行试验和研究。通过试验和研究表明，该轴向加荷疲劳试验机动态力校准装置在500Hz频率范围内可以满足常用轴向加荷疲劳试验机动态力校准的要求。此外，以本校准装置校准某型号的电磁谐振式疲劳试验机动态力为例，对其动态力校准结果、惯性力修正进行分析和讨论，并对动态力校准结果的不确定度进行评估。

Novel approach for determining the optimal axial preload of a simulating rotary table spindle system

This paper presents a new theoretical model to determine the optimal axial preload of a spindle system, for challenging the traditional method which relies heavily on experience of engineers. The axial preloading stiffness was treated as the sum of the spindle modal stiffness and the framework elastic stiffness, based on a novel concept that magnitude of preloads can be controlled by measuring the resonant frequency of a spindle system. By employing an example of a certain type of aircraft simulating rotary table, the modal stiffness was measured on the Agilent 35670A Dynamic Signal Analyzer by experimental modal analysis. The equivalent elastic stiffness was simulated by both finite element analysis in ANSYS? and a curve fitting in MATLAB?. Results showed that the static preloading stiffness of the spindle was 7.2125×107 N/m, and that the optimal preloading force was 120.0848 N. Practical application proved the feasibility of our method.