摘要
利用热弹体运动方程和热传导方程耦合问题的变换域解,求解其极点留数的解析表达式.通过数值求根方法,得出铁-水、铝-水、铁-空气、铝-空气这4种流-固界面波的速度值,从而得到4种界面各界波相应的极点留数值.用快速傅立叶变换(FFT)技术得到脉冲激光线源热弹激励时流-固界面波瞬态位移波形.计算结果表明,这2种界面波不但存在于液-固界面,而且存在于气-固界面,但这2种流-固界面上波成分的相对幅度、脉冲持续时间不同.
For the transformed solution of the thermoelastic and heat conduction equations coupled problem,the analytical representation of the pole residues is obtained.The velocities of the fluid-solid interface waves propagated along the iron-water,aluminium-water,iron-air,aluminium-air interfaces are solved by using the numerical root-finding method,thus the pole residues of the interface waves for the four interfaces are obtained.The transient displacement waveforms excited thermoelastically by a pulsed laser line source are performed numerically.The results show that the two kinds of interface waves exist at the liquid-solid interface and also exist at air-solid interface,but the relative amplitude,the pulse duration for the corresponding wave component at the two kinds of fluid-solid interfaces are different.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第4期548-550,共3页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目(10174052
10134020)
同济大学理科基金资助项目
关键词
流-固界面波
激光超声
数值模拟
fluid-solid interface waves
laser ultrasonics
numerical simulation
