Computer-aided modeling and finite element method are advanced CAD/CAE technologies developed with the application of computer technology. They are widely used in scientific computing, design and analysis in various fields, and successfully solved many complicated designs. And analyzing problems has become an important tool in engineering design and analysis. Previous page next page Butterfly Brand Knife,Real Butterfly Knifes,Practice Butterfly Knifes,Butterfly Tool Knife YangJiang Junxiong Trading & Industry Company Co.,Ltd , https://www.cn-sundo.com
The design includes the shape of a spacecraft component and the pressure forming analysis of thin-plate parts, which has practical significance in engineering. In the three-dimensional design, a tail nozzle, a rudder, and a wing are designed, wherein the tail nozzle is composed of four parts, including an inner support portion and an outer skin portion. Both the rudder and the wing are made up of more than two skin surfaces. In the finite element analysis, the elastoplastic analysis of the thin metal plate and the elastoplastic analysis of the rudder surface were carried out, and the superplastic analysis of the thin plate was also carried out.
2.4 Application of finite element analysis in engineering At present, the application of finite element method in mechanical engineering mainly has the following aspects:
Statics analysis: This is the analysis of stress, strain and deformation after loading of two-dimensional or three-dimensional mechanical structures. It is the most basic and most commonly used analysis type of mechanical engineering in finite element method. Static analysis should be performed when the load acting on the structure does not change over time or changes very slowly at any time.
Modal analysis: This is a type of kinetic analysis used to study the vibrational properties of the natural frequency and the self-vibration pattern of the structure. The loads applied during this analysis can only be displacement loads and pre-stress loads.
Harmonic response analysis and transient dynamics analysis: These two types of analysis are also kinetic analyses used to study the dynamic response of structures to cyclic and aperiodic loads.
Thermal stress analysis: This type of analysis is used to study the temperature stress inside the structure when the operating temperature of the structure is not equal to the installation temperature or when there is a temperature distribution inside the structure during operation.
Contact Analysis: This is a state nonlinear analysis used to analyze the contact surface state, normal force, etc. when two structures are in contact. Since the transmission of force between the structure and the structure in the mechanical structure is achieved by contact, many applications of the finite element method in the mechanical structure are contact analysis. However, prior to the constraints of computing power, contact analysis applications were less.
Buckling analysis: This is a geometric nonlinear analysis used to determine the critical load and buckling mode shape when the structure begins to become unstable, such as the stability of the strut.
In a highly competitive market environment, in order to gain a competitive advantage, companies urgently need to be able to quickly develop high-quality, low-cost products and quickly seize the market. Therefore, the business community urgently needs high-tech, high-speed, low-cost design methods. With the rapid development and popularization of computer technology, the finite element method has rapidly expanded from structural engineering strength analysis and calculation to almost all fields of science and technology, becoming a colorful, widely used, practical and efficient numerical analysis method, finite element in product design. And the unparalleled superiority shown in the development, making it an important tool for enterprises to win in the market competition.
2.5 The basic steps of finite element analysis are object discretization. The analyzed objects are discretized into a finite number of units, the number of units being determined according to needs and calculation accuracy. In general, the more detailed the unit division is, the more accurate the deformation is, the closer it is to the actual deformation, but the larger the calculation.
Cell characterization. First select the displacement mode. The finite element method usually uses the displacement method, so you should first choose a reasonable displacement mode (displacement function). The mechanical properties of the unit are then analyzed. According to the material properties, shape, size, number of nodes, position and meaning of the unit, the relationship between the unit node force and the node displacement is found, that is, the unit stiffness matrix is ​​derived, which is a key step in the analysis. Finally calculate the equivalent nodal force. The surface forces, volume forces, or concentrated forces on the cell boundaries are equivalently transferred to the nodes, that is, the equivalent nodal forces are used to replace all forces acting on the cells.
Unit group set. Using the balance conditions and boundary conditions of the structural forces, the individual elements are rejoined according to the original structure to form an overall stiffness matrix.
Solve the unknown node displacement. Solve the finite element equation to find the node displacement, and then find all the unknowns according to the node displacement. In the final analysis, the finite element method is a method for solving ordinary and partial differential equations. In theory, any engineering problem that can be generalized to solve differential equations can be solved by the finite element method. Therefore, the finite element method can perform structural, thermal, electromagnetic, fluid, acoustic analysis.