摘要
跨介质飞行器水下发射或高速入水过程中,空泡在壁面溃灭会产生较大压力脉冲,使舱体由于局部外压发生变形,由此引起的局部应变会成为载荷测量中截面应变的干扰应变,对截面载荷测量产生较大影响。为了从应变桥路中消去壳体局部弯曲应变的影响,基于壳体受力模式分析,本文提出在舱段表面打孔将应变片直接贴在中面的方法,以期消除局部弯曲应变的影响。并通过有限元仿真方法确定打孔及虚拟电桥应变片位置,消除了局部高强度外压对弯矩桥路应变的影响;提出了基于均匀外压标定得到环向非均布外压影响的耦合灵敏度标定方法并通过有限元验证了该方法的合理性。地面验证试验表明,考虑外压耦合灵敏度,在保证弯矩识别精度的前提下,轴力识别误差明显降低。
This paper introduces the measuring method of cross section load during underwater movement of the trans medium aircraft.During underwater launch or vertical water exit of the trans medium aircraft,the collapse of the bubble on the wall will produce a large pressure pulse,which will deform the cabin due to local external pressure.The local strain caused by this will become the interference strain of the cross section strain in the load measurement,which will have a great impact on the cross section load measurement.In order to eliminate the influence of local bending strain of the shell from the strain bridge,based on the analysis of the force mode of the shell,this paper proposes a method of drilling holes on the cabin surface and attaching the strain directly to the middle surface,in order to eliminate the influence of local bending strain.The strain position of the punching and virtual bridge was determined by finite element simulation method to eliminate the influence of local high strength external pressure on the strain of the bending moment bridge.A coupling sensitivity calibration method based on uniform external pressure calibration is proposed to obtain the influence of circumferential heterogeneous external pressure and the rationality of the method is verified by finite element method.The ground verification test shows that considering the sensitivity of external pressure coupling,the axial force identification error is significantly reduced on the premise of ensuring the accuracy of bending moment identification.
作者
王语嫣
刘思宏
李明
洪良友
马斌捷
荣克林
WANG Yu-Yan;LIU Si-Hong;LI Ming;HONG Liang-You;MA Bin-Jie;RONG Ke-Lin(Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;Beijing Institute of Astronautical System Engineering,Beijing,100076,China)
出处
《强度与环境》
CSCD
2023年第2期33-39,共7页
Structure & Environment Engineering
基金
基础研究项目。
关键词
跨介质飞行器
载荷测量
虚拟电桥
Trans-media vehicle
Load measurement
Virtual bridge
