空测随机载荷的块模拟技术

为了提高航空叶片疲劳寿命预测的精度,本文探讨了随机载荷的块模拟技术;推导出了块谱划分的等效损伤数学模型;组建APPLEⅡ接口系统,用6502大汇编语言程序解决了振动谱的高频振动和综合场数据的快速处理,利用数学模型编程得到了适用于程控疲劳试验所需的块谱。

SIMULATION OF FLIGHT SPECTRUM FOR AERO-COMPRESSOR BLODING

In order to improve the prediction accuracy of service life of aeroco-mpressor blading, especially concerning its vibrating loading, it is necessary to carry out the following researclhes. Firstly, the load acting on the bloades is recorded inflight according to randomly sequencing mission profiles of various types of engines. Secondly, this field load is to be simulated in laboratory.In this paper, a technique for the simulation of the blade randomly vibrating spectrum has been investigated. A mathematical model for a step-load spectrum under which the blade fatigue damage is equivalent to that of in-service flight load has been derived. Using APPLE I interface system and 6502 machine language programme to deal with the vibrating spectrum, the step-load spectrum which is extraordionarily suited to microcomputer programming load control for fatigue test is obtained.