The surface of the plate is simulated by the method of Ferguson surface, and template lineconcept is defined. Utilizing parameter spline curve, space coordinate conversion, the forming both in transverse and longitudinal direction, as well as distortion of the processed hull plate are inspected, which is the foundation for carrying out parameter prediction in second processing.

The temperature distribution in the plate during the LH procedure is analyzed, and the numerical analysis of the transient temperature distribution of a three dimension under the condition that the thermo-material property and the heat exchanging condition on the boundary vary with temperature is completed.

2. This study developed an analysis model of electromagnetic-thermal coupling field, simulated the electromagnetic and heat transfer phenomena using the present model by finite element method, and obtained the law of distribution of the plate's partial temperature field.

The induction heating is transforming the electricity energy to heating, and the distributing of temperature is different in different part of steel plate, and the heating stress can make the plate forming.

In this paper, a lot of research works in theoretic study, numerical simulation and experiments by electromagnetic induction heating were did, the main contents are summarized as follows:1. The temperature field model of steel plates was set up by finite element method, and obtained the distribution law of the plate's partial temperature field under different combination of parameters through analyzing the temperature field of the steel plate.

In the paper,a slippery plate in a flui d flow is chosen as an example,s imple models for gas and liquid boundary layer of microbubbles on the surface of the plate are established. And then by use of classical laminar boundary layer t heory,the friction drag in the condition of microbubbles is calculated for a ran ge of blowing velocity values and of fluid property parameters.

On the basis of discussing on the beam element, the thickness of the plate element t and the inertia Iy as the parameters of sensitivity analysis were discussed to analyze the structure parameter by themethod of the difference sensitivity analysis.

The total energy of the dynamic loads was sufficiently large to cause plastic flow of the plate material and the maximum permanent deflections from 3.78 to 20.87 times the corresponding plate thicknesses.

A simple nonlinear wing theory for the low-aspect-ratio rectangular flat plate with large angle of attack in incompressible flow is developed. The plate is replaced by a finite number of horseshoe vortex lines which are located along the chord of the plate and which are of different strength. The free parts of the vortex lines make an angle θ with the plate. For the solution of the problem an iterative procedure is applied. The angle θ is initially assumed to be one half of the angle of attack and...

A simple nonlinear wing theory for the low-aspect-ratio rectangular flat plate with large angle of attack in incompressible flow is developed. The plate is replaced by a finite number of horseshoe vortex lines which are located along the chord of the plate and which are of different strength. The free parts of the vortex lines make an angle θ with the plate. For the solution of the problem an iterative procedure is applied. The angle θ is initially assumed to be one half of the angle of attack and the first approximate values for the strength of the vortex lines are computed. By application of the Helmholtz principle at the side edges of the plate, the second approximate value for the angle θ is determined. By repeating this calculation, the second approximate values for the strength of the vortex lines and then the aerodynamic coefficients of the plate are obtained. A few examples are calculated and the theoretical results are compared with the experimental ones. It is shown that for low-aspect-ratio rectangular plates this theory agrees very well with the experiments.

In this paper, by using the assumptions of average deflection, average rotation and average shear deformation, the differential eqs. of the flexural vibrations of the orthotropie plates taking into account the effect of shear deformation and rotatory inertia are derived. The formula for calculating the freqijncies of rectangular plates with simply supported edges is obtained. If let the length of one edge-voo, then this formula becomes the freqency formula of Timoshenko's beam. Futhermore, the condition...

In this paper, by using the assumptions of average deflection, average rotation and average shear deformation, the differential eqs. of the flexural vibrations of the orthotropie plates taking into account the effect of shear deformation and rotatory inertia are derived. The formula for calculating the freqijncies of rectangular plates with simply supported edges is obtained. If let the length of one edge-voo, then this formula becomes the freqency formula of Timoshenko's beam. Futhermore, the condition of several concentrated masses on the plates is considered. The approximate formulas for calculating freqenciesin this condition are gained by means of the method and the Rayleigh-Ritz's method, and are applied to calculate the freqencies of the ship's double bottom in engine room. From the example, we can see that the effect of shear deformation on the freqeneies of the double bottom in engine room is very large. If we neglect the effcet of shear deformation, i.e. the classical theory of flexural vibrations of plates is used, the calculated values of the 1st freqeney of the double bottom in. engine room are larger than the experimental values about 20%. However, by using the method of present paper, taking into account the shear deformation, these errors fundamentally can be corrected.

This paper is concerned with the iniluence of torsional rigidity of transverse beams on the postbuckling behavior of transversely framed deck plates.The Karman differential equations of the large deflection theory of thin plates are solved by using Boobnov-Galerkin method.The approximate formulas of the reducing factor φ of the deck plates concerning the restraining effect of transverse beams are then obtained.Numerical calculation is made for four sizes of angles and T profiles, which may be happened in the...

This paper is concerned with the iniluence of torsional rigidity of transverse beams on the postbuckling behavior of transversely framed deck plates.The Karman differential equations of the large deflection theory of thin plates are solved by using Boobnov-Galerkin method.The approximate formulas of the reducing factor φ of the deck plates concerning the restraining effect of transverse beams are then obtained.Numerical calculation is made for four sizes of angles and T profiles, which may be happened in the shipbuilding.The results are represented in table and graphically.From the numerical calculation, the following conclusions are drawn.Firstly, the solution of P.A.Sokolov is adapted to the plate of ratio λ(=b/a), which is greater than two.If the ratio is less than two, the beneficial effect of restrained effect of transverse beams on the stability and postbuekling behavior of the deck plates should be taken into account.This beneficial effect is increased with the increase of size of profiles of beams, and is decreased with the increase of the ratio λ.In this case, the solution of P.A.Sokolov is not adaptable.Secondly, when the ratio λ is greater than two, multiple approximations are then required.In case of square plate the first approximation is quite accurate in practice.On the basis of above conclusions a formula for estimating the reducing factor of deck plates concerning the restrained effect of transverse beams is recommended.