航空机载温度传感器耐久性分析与仿真预计
2020-03-13王尊敬彭艳王天资
王尊敬 彭艳 王天资



摘 要:为了保障飞机的使用寿命,确保飞机飞行安全,开展耐久性分析具有重要意义。文章以某型航空机载温度传感器为研究对象,通过耐久性主机理分析和有限元仿真预计相结合的方法,围绕耐久性及疲劳寿命预测展开研究,结果表明:传感器的耗损原因为承受机械或疲劳载荷,主要损耗激励为疲劳或循环应力;传感器承受循环应力振动载荷循环次数远远超过107,传感器整体结构接近无限寿命,能够满足规定的耐久性要求。
关键词:温度传感器;耐久性分析;有限元仿真;疲劳寿命预计
中图分类号:V215 文献标志码:A 文章编号:2095-2945(2020)08-0037-04
Abstract: In order to ensure the life span and the safety of the aircraft, it is of great significance to carry out durability analysis. In this paper, an airborne temperature sensor is taken as the research object, and the durability and fatigue life prediction were studied by combining the durability main mechanism analysis and finite element simulation prediction. The results show that the cause of sensor wear is mechanical or fatigue load, and the loss of motivation is fatigue or cyclic stress. The number of cycles of the sensor under cyclic stress and vibration load exceeds 107, and the overall structure of the sensor is closed to infinite life, which can meet the specified durability requirements.
Keywords: temperature sensor; durability analysis; finite element simulation; estimated fatigue life
当今世界上许多先进民用飞机的疲劳寿命已达60000~90000飞行小时,而我国飞机的疲劳寿命仅为25000~30000飞行小时[1-2]。究其原因,除了在材料、使用维护等方面与国外存在差距外,另一个主要原因是机载设备在结构设计与制造上不能满足耐久性要求,造成我国飞机的安全使用寿命较低[3]。为了保障飞机使用寿命的各项性能指标,确保飞行安全,满足飞机结构的长寿命、高可靠性、高出勤率和低维修成本的综合要求,研究机载设备结构的耐久性具有重要意义[4-5]。
装配于航空发动机的传感器通常所处工作环境恶劣,在相当短的时间内会经受大温度梯度变化和大量级振动载荷,从而引起较大的交变应力,振动疲劳损伤严重。因此,在传感器设计阶段即需要开展耐久性研究工作。本文首先簡要介绍了航空……
