On the base of above work , nonlinear characteristics of hydrodynamic pressure on ship surface are studied by the means that compares the theoretical results with those of model experiments 在上述研究工作的基础上，采用理论计算与模型试验相结合的方式，研究了船体表面水动压力的非线性特性。
The additive moving - pressure will convey to the machine through the bearing , which will arose the whole machine vibrating , producing noises , gathering way the bearing ' s wear and tear , depressing the machine ' s natural life , even making the machine malfunction which may result in the severe accident 附加的动压力将通过轴承传达到机器上，引起整个机器的振动，产生噪音，加速轴的磨损，降低机器的寿命，甚至使机器失灵，发生严重的事故。
On the action of magneto mechanical coupling of rotating magnetic field generated by turning of exterior driver , robot was spun to generate propulsion in axial direction under the function of fluid dynamic pressure distributed on spiral surface of the robot , as a result , spiral and drive motion of the capsule type micro robot in intestine was realized 通过外驱动器的旋转产生旋转磁场，借助于磁机耦合作用，驱动机器人旋转并在其外螺纹表面形成的流体动压力作用下产生轴向推力，进而实现胶囊式机器人在肠道内旋进。
The major work is as follows : solution of two dimensional radiation or diffraction fluid field . this thesis extends multipole expansion method to adapt to disturbed fluid fields of 2d floating bodies with asymmetric forms , which is applied with symmetric forms originally . and given the solution of potential velocity and hydrodynamic pressure of radiation and diffraction fluid fields , which is incited by a 2d arbitrary form , actual application field of the multipole expansion method has been enlarged 关于二维扰动流场的求解：将通常仅适宜求解具有对称形状二维物体扰动流场的多极展开法(保角变换方法)扩展至非对称形状二维物体，给出了任意形状二维物体的辐射和绕射流场的速度势及水动压力的频域解，进一步扩大了多极展开法的实际应用范围。
Applying the method studied in this thesis , theoretical calculation of certain container ship in regular wave has been done on ship motion and hydrodynamic pressure . it also has the results compared with those obtained under multipole conditions in the model tests . as a consequence , we abstract some characteristics of the distribution of instantaneous hydrodynamic pressure on ship wet surface , and the distribution changes with forward speed and wave parameters 利用本文方法对某集装箱船进行了规则波中的船舶运动和水动压力的理论计算，并与船模水池试验所提供的多状态的压力分布数据相比较，得出船体表面瞬时压力的分布及其随航速和波浪参数变化的某些规律。
