大型飞机多支柱交联式起落架一体化载荷校准及建模研究

针对某大型飞机多支柱交联式起落架结构受力及传力特点,首次采用一体校准、独立建模的载荷试验方法,三支柱起落架侧挂正向一体安装、一体加载,解决了多支柱之间的载荷影响问题。根据交联式多支柱结构受力及传力特点,进行应变电桥及载荷工况设计,载荷工况既包括常规的单支柱加载,还包括满足多支柱影响的两支柱及三支柱组合加载工况。提出了多支柱广义响应系数概念,并通过广义响应系数对支柱之间的影响效果进行分析,显示支柱载荷向前单向传递,后支柱影响紧邻前支柱,前支柱不影响后支柱。据此提出了支柱独立建模、载荷逐次迭代、基于广义响应系数的支柱消扰载荷建模方法,获得了满足精度要求的载荷模型。

Holistic Loads Calibration and Modelling of Tri-Strut Connected Landing Gear for the Large Aircraf

In view of the structure characteristic of the force of the load and the transmission force on tristrut connected landing gears, holistic load calibration but regressing loads modal respectively test method are adopted for the first time, the three struts landing gears are installed and loaded as one, and the effect problem among the struts loads are resolved successfully. With loads and structure analysis, strain gauges and loads cases are designed for the struts with I -shaped section and large obliquity, and loads cases include single strut cases, as well as combination loads cases of two or three struts. General reference coefficient of multi-strut is put forward to analyze the effect among the struts loads. The result indicates that the loads are transferred forwards, the latter one affects the proximate front one, but the front one doesn''t affect the latter one. In terms of this result, the policy of regressing loads modal is put forward which is regressing loads modal respectively and calculating struts loads one by one, then deducting the influence between struts according to the general reference coefficient. The test method is impactful and the loads modals meet the needs of precision.