摘要
衬层是固体火箭发动机粘接推进剂的中间层,其固化状态影响着界面的粘接质量,故在线监测并判断衬层的固化状态是保障发动机装药及安全质量的前提。本文以烧蚀机制下的激光超声为手段,研究丁羟衬层在固化过程的监测方法及固化状态表征技术,详细阐述了在线监测衬层固化过程实验,针对激光超声参量表征衬层固化问题,重点分析了回波的时域和频域双谱特征,分别提取了激光超声纵波在多层粘接结构中衬层的传播时间、速度及特征波的非线性谐波三阶谱峰值为特征量,表征了衬层固化过程的状态变化规律。结果表明,在特征波时域信息中,固化反应的进行会导致不同状态之间特征波的到达时间依次减小0.02μs,激光超声纵波在衬层中的传播声速依次增加约40 m/s;在频域双谱信息中,非线性谐波三阶谱峰值随着固化反应的进行逐渐增大,不同状态的极差依次为0.1167×10^(-3)V^(3)、0.9799×10^(-3)V^(3)、0.6360×10^(-3)V^(3)。综上,本文中的在线监测实验及激光超声参量分别能有效监测、表征衬层的固化状态。
The liner is the middle layer of the solid rocket motor bonding propellant,and its curing state affects the bonding quality of the interface.Therefore,online monitoring and judging the curing state of the liner is the premise to ensure the engine charge and safety quality.In this paper,using laser ultrasound under the ablation mechanism as a means to study the monitoring method and curing state characterization technology of butylated hydroxy lining during the curing process,the online monitoring of the curing process of the lining is described in detail.The time-domain and frequency-domain bispectral characteristics of the echoes are analyzed emphatically,and the propagation time,velocity and nonlinear harmonic third-order spectral peaks of the characteristic waves of the laser ultrasonic longitudinal wave in the lining of the multilayer bonded structure are extracted as the characteristic quantities.,which characterizes the state change law of the liner curing process.The results show that in the time domain information of the characteristic wave,the progress of the curing reaction will lead to a sequential decrease of the arrival time of the characteristic wave between different states by 0.02μs,and the propagation sound speed of the laser ultrasonic longitudinal wave in the lining layer is successively increased by about 40 m/s;In the frequency-domain bispectral information,the third-order spectral peaks of nonlinear harmonics gradually increased with the progress of the curing reaction,and the ranges of different states were 0.1167×10^(-3)V^(3),0.9799×10^(-3)V^(3),and 0.6360×10^(-3)V^(3) in proper sequence.In conclusion,the online monitoring experiments and laser ultrasonic parameters in this paper can effectively monitor and characterize the curing state of the lining,respectively.
作者
刘晨
陈友兴
谭辉
柴华淇
Liu Chen;Chen Youxing;Tan Hui;Chai Huaqi(Xi'an Modern Chemistry Research Institute,Xi'an 710000,China;School of Information and Communication Engineering,North University of China,Taiyuan 030000,China)
出处
《电子测量技术》
北大核心
2022年第17期171-176,共6页
Electronic Measurement Technology
基金
山西省自然科学基金(20210302124189)项目资助。
关键词
衬层
激光超声
固化
表征
lining layer
laser ultrasound
curing
representation