带有消声瓦的潜艇耐压壳在流场中的阻尼振动和层间应力

在壳厚方向采用位移和应力插值函数,应用混合分层理论和壳体在流场中所受的流体动压力.推导带有消声瓦的潜艇耐压壳在流场中的动力学方程.采用迭代的方法求出潜艇耐压壳在流场中阻尼振动的解.在不同粘弹性材料弹性模量和厚度下.分别计算了潜艇耐压壳在流场中阻尼振动的一阶固有频率、结构损耗因子和层间横向应力的幅值.结果表明,随粘弹性材料弹性模量的增大,一阶固有频率和结构损耗因子增加,随粘弹性材料层厚度的增大,结构损耗因子增加.一阶固有频率减小.较高的层间法向正应力是造成潜艇消声瓦在流场中低频振动脱落的主要原因.采用较高模量和厚度的牯弹性阻尼材料将有效地降低潜艇耐压壳在流场中阻尼振动的层间应力的幅值.

Damping vibration and interlaminar stresses of submarine pressure hull with anechoic tile in fluid

Applying the interpolation functions of displacements and transverse stress,by use of the mixed layerwise theories and the radiated pressure in fluid,the dynamics equations of submarine pressure hull with anechoic tile were deduced.The numerical solutions for simple-support laminated shells were derived through Navier solutions and iterative method.The predicted vibration frequency,loss factor and the amplitudes of interlaminar transverse stresses were computed for different Young's modulus and thickness of viscoelastic layer.The results show that the first rank frequency and loss factor will increase with higher Young's modulus of a viscoelastic layer;moreover,the first rank frequency will increase and loss factor will decrease with thicker Young's modulus of a viscoelastic layer.The higher transverse normal stresses are the main factor which leads to the break of anechoic tile for the submarine in low frequency.Using a higher module and thickness viscoelastic layer will decrease the amplitude of interlaminar transverse stress.