收稿日期:2017-11-30
作者简介:牛书锋(1983—),男,硕士,高级工程师,研究领域为材料加工工程
作者简介:牛书锋(1983—),男,硕士,高级工程师,研究领域为材料加工工程
备注
多余物的控制是航天型号产品研制生产过程中的关键,多余物检查及排除是保证火箭发动机可靠工作的重要环节。针对1 200 kN液氧煤油发动机总装后不能进行多余物检测的问题,采用机械转台将被检查产品进行滚动,使存在于发动机内腔的金属多余物与其内壁发生碰撞和滑动,在此过程中产生的声信号以弹性波的形式传播到产品外壁,通过声发射传感器监测该信号,并转化成相对应的电信号输出,给出多余物有无的判定信息和存在位置的参考信息。通过对发动机多余物自动检测中浮动环及电磁干扰噪声的屏蔽,以及发动机整机多余物自动检测中发动机滚动的转速、传感器的阈值以及触发信号同步接收时间等工艺参数的研究,得到了发动机多余物检测的最佳工艺参数,实现了1 200 kN液氧煤油发动机整机多余物自动检测。
The redundancy control is the key to the development and production of aerospace products,and the inspection and elimination of redundancy is an important part of ensuring the reliable operation of rocket engine.In order to solve the problem that the redundancy detection cannot be carried out after the final assembly of 1 200 kN LOX/kerosene engine,the inspected product is rolled by a mechanical turntable,so that the metal redundancy existing in the engine cavity collides and slides with the inner wall.During this process,the generated acoustic signal is transmitted to the outer wall of the product in the form of elastic wave.The signal is monitored by the acoustic emission sensor and converted into a corresponding electrical signal output.The determination information of redundancy and the reference information of its existence position are given.Through the shielding of the floating ring and electromagnetic interference noise in the automatic detection of engine,as well as the research on the engine rolling speed,the sensor threshold and the synchronous reception time of the trigger signal,etc.,the optimum process parameters for engine redundancy detection are obtained.The automatic redundancy detection of 1 200 kN LOX/kerosene engine has been realized.
