37 results about "Shell theory" patented technology

The invention relates to a back penetration type measurement method for film-substrate cohesion performance in the measurement technical field. An ejector rod is adopted by the invention to penetrate the basement system of a part to be measured. Load is arranged on the lower end of the ejector rod. And the ejector rod is pushed to make a film deformed in a way of bending. The defection and the load of the film are respectively obtained by corresponding sensors when loaded in a static load form. The film-substrate cohesion of the part to be measured under static load is worked out through the plate shell theory. When load is added in a dynamic form, a relationship between the crack growth length and the cycle number, which is used for evaluating the fatigue performance of the film, is built up through measuring the radius of a film salient area and recording the cycle number. The invention solves the technical problems in present technology that the precast of the part to be measured is complex and the basement system is limited by silicon material. The invention can quantitatively measure the film-substrate cohesion performance, precisely determine the film-substrate cohesion and obtain the fatigue performance parameters of the film.

The invention discloses a method for calculating the natural frequency of marine pipeline natural vibration. The specific steps are: measuring the radius R, length L, wall thickness h and density ρ of the marine pipeline; determining the Young's modulus E and Poisson's ratio of the marine pipeline material μ; measure the density ρ of seawater f ; Calculate the natural frequency of the free vibration of the ocean pipeline when the fluid-structure interaction effect is considered by the natural frequency calculation formula. The invention is based on the plate and shell theory, considers the influence of the fluid-solid coupling effect of the fluid and the shell structure on the free vibration of the shell, analyzes the free vibration phenomenon of the marine pipeline as a whole, and proposes a more reasonable and simpler natural frequency calculation method.

The invention provides a method for determining distributed process parameters of a laser peening forming complex curved surface. The method comprises the following steps: establishing a function relationship between a deflection curved surface and an intrinsic moment based on plate shell mechanics, and establishing an optimization model based on partial differential equation constraint by takinga distributed intrinsic moment function as a design variable; according to a curved surface parameter equation or a curved surface coordinate of the workpiece, dispersing a target curved surface, selecting an appropriate optimization algorithm to solve an optimization model, and calculating a distributed natural moment; dividing into a plurality of isoparametric areas convenient for process operation according to the size of the distributed natural moment, and determining a laser peening forming scanning scheme in each area; and establishing a process database corresponding to process parameters and inherent moments through experiments, determining the experiment process parameters, and determining the optimal distributed process parameters in combination with the requirements of residualstress. The method for determining the complex curved surface forming technological parameters is established on the basis of the elastic plate shell theory, and high efficiency and precision are achieved.

The invention discloses a robot intelligent perception skin system based on a finite element plate and shell theory learning library, which includes a sensing module, a finite element theory learning module and a post-processing module; when an external force acts on the sensing module, the sensing module Transfer the collected data to the post-processing module, and use the data in the finite element theory learning module in the post-processing module to simulate and display the position and magnitude of the external force to achieve the effect of intelligent perception of the skin. The present invention adopts the discretization patching method of sparse nodes, and directly sticks the positions of the strain gauges on the discrete nodes (triangular sticking method, quadrilateral sticking method) on the robot skin, greatly reducing the number of sticking plates, thereby reducing the cost.

The invention discloses a method for obtaining the modulus of elasticity of a plate-shaped member, which includes the following steps: S10: Establish three-point force test conditions to obtain the pressure P on the plate-shaped member and the pressure P generated based on the pressure P Deflection Umax; S20: Obtain the relational formula of elastic modulus E, pressure P, and deflection Umax of the plate-shaped member based on the plate and shell theory; S30: Calculate the elastic modulus E of the plate-shaped member based on the pressure P and deflection Umax. The invention obtains the elastic modulus of the plate-shaped member by introducing the calculation formula of the plate-shell theory, so that the sample size is not limited by the width of ASTM and GB test specifications, and the range of the measurable object size is wider. The calculation process of the elastic modulus takes into account the influence of the width of the plate-shaped member on the elastic modulus, so that the calculated elastic modulus is closer to the real elastic modulus.

The invention belongs to the field of strata control in coal mine filling and mining, and in particular relates to a method for determining the height of a fractured zone of overlying strata in filling mining based on the plate and shell theory. The method first judges the position of a hard rock stratum, and secondly obtains the critical load and limit displacement of the hard rock stratum, and then Obtain the height of the free space below the hard rock layer and the overlying load of the hard rock layer, and judge whether the fault zone is developed by comparing the critical load with the overlying load of the hard rock layer, the limit displacement and the height of the free space below the hard rock layer; the basic parameters involved in this method , can be obtained according to geological data, laboratory tests and other methods after the mining design of the working face is completed. Disasters caused by destruction, the present invention has wide practicability in analyzing the law of overburden rock activity in filling mining.