KR20170091440A - Method for Analyzing Structure and Computer Readable Media Recording Program to Execute the Same - Google Patents

Abstract

A structural analysis method for performing the structural analysis of a structure which is partitioned by a partition wall to form a plurality of flow paths in which a fluid is disposed according to an embodiment of the present invention, includes a step of allowing a modeling means to generate an equivalent stiffness model of a longitudinal layer where a flow path is formed and a longitudinal layer where the flow path is not formed, a step of allowing a calculation means to apply the physical property of a composite shell to the equivalent stiffness model, and a step of allowing the calculation means to perform operation using a composite module software.

Description

[0001] The present invention relates to a structure analysis method and a computer-readable medium recording a program for executing the structure analysis method.

The present invention relates to a method for performing a structural analysis on a structure having a plurality of minute flow paths and a computer-readable medium recording a program for executing the structure analysis. More particularly, the present invention relates to a structure analysis And a computer-readable medium storing a program for executing the method.

When performing the structural analysis of complicated minute flow path shape, the analysis using the composite material analysis module embedded in most commercial structural analysis software can reduce the modeling time and the consumption of the calculation resources.

Applications where such microfluidic channels are used include chemically etched heat exchangers, cooling bulkheads in rocket combustors, cooling fins in internal combustion engines, and the like.

In order to verify the structural stability of a structure with a fine flow path, a structural analysis using a finite element method is performed. At this time, a fine flow path of the structure should be modeled in order to perform structural analysis.

However, when a large number of flow paths having the same shape are modeled in three dimensions, the number of elements of the analytical model increases, consuming a large amount of operation resources, and therefore, it takes a considerable time to obtain the analysis result.

On the other hand, when the two-dimensional equivalent model is simply used, there is a problem that the rigidity which varies depending on the shape of the fine flow path can not be accurately described.

In addition, modeling the repetitive shape has a problem that the development period of the design is extended.

U.S. Patent No. 8,306,789

Embodiments of the present invention provide a method of analyzing a fine flow path structure using a composite material module and a computer-readable medium recording a program for performing the method.

A structural analysis method for performing structural analysis of a structure partitioned by a partition wall according to an aspect of the present invention and having a plurality of flow paths to be disposed thereon is characterized in that the modeling means includes a longitudinal layer A step operation means for creating an equivalent stiffness model of the longitudinal layer applies the composite shell property to the equivalent stiffness model and the operation means performs the operation using the composite module software.

Here, the step of generating the equivalent stiffness model may include a step of creating a longitudinal layer in which the flow path is not formed as an isotropic model, and a step of creating a longitudinal layer in which the flow path is formed as an anisotropic model .

The step of generating the anisotropic model includes a step of assuming that the flow path is a matrix and assuming that the partition defining the flow path is a fiber.

Wherein the step of generating the equivalent stiffness model comprises the steps of:

Here, rho 1 is the density of the partition wall, R1 is the volume ratio of the partition wall,

rho 2 is the density of the fluid flowing in the flow path, and R2 is the volume ratio of the fluid.

Meanwhile, the step of generating the equivalent stiffness model may be such that an equivalent elastic modulus is generated by the following equation,

Here, Ex is the x direction elastic modulus, Ez is the z direction elastic modulus, and Ey is the y direction elastic modulus.

The step of generating the equivalent stiffness model may include generating an equivalent shear modulus according to the following equation,

Where Gxy is the xy plane shear number, Gyz is the yz plane shear number, Gzx is the zx plane shear number,

R1 is the volume ratio of the partition wall, and R2 is the volume ratio of the fluid.

According to another aspect of the present invention, there is provided a computer-readable medium having recorded thereon a program for performing the above-described structural analysis method.

According to the structure analysis method of the various embodiments of the present invention and the computer-readable medium recording the program for performing the structure analysis, it is possible to eliminate the wasteful elements of computational resources according to the conventional three-dimensional analysis.

In addition, according to the present invention, even if it is not a fine flow path, irrespective of the size of the structure, the structure is a plate-like structure, the flow path is formed in a predetermined direction, the structure material and the partition wall are made of a homogeneous material, Shaped features with no voids can be used for structural analysis.

In addition, according to the present invention, cooling channel analysis can be implemented by an analysis module of conventional general structure analysis software.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view briefly explaining a layer structure of a structure of a microchannel structure analysis according to an embodiment of the present invention; FIG.
FIG. 2 is a conceptual diagram of a case in which a fluid is filled in a flow path in the structure having the micro flow path shown in FIG. 1;
3 is a flowchart illustrating a method of analyzing a fine flow path structure according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view briefly explaining a layer structure of a structure of a microchannel structure analysis according to an embodiment of the present invention; FIG.

Referring to FIG. 1, a structure 100 to be subjected to structural analysis includes a plurality of micro flow paths 102 spaced apart in the y direction by a partition wall and spaced apart in the x direction.

In this case, in view of the zy plane shown in Fig. 1, a layer L2 in which the barrier ribs and the flow paths are mixed is disposed between the layer L1 and the layer L3 made up of only the barrier ribs. That is, by separating the structure into layers by zy plane, one layer can be replaced by one shell element of the composite material.

Also, the y direction in the zy plane is represented by the longitudinal direction, and one layer can be considered to extend in this longitudinal direction.

2 is a conceptual diagram of a case in which a fluid is filled in a flow path in a structure in which the microfluidic channel of FIG. 1 is formed.

Here, if the structure 100 constitutes a cooling device, the individual flow path 102 is a flow path through which the cooling water C flows, and the flow path 102 through which the cooling water flows includes a partition wall 104 Exchanges heat with the element to lower the temperature of the component.

1 and 2, the cooling water C as a fluid flows in the flow paths 104 of the layer L2, and the cooling water, which is a fluid flowing through the flow path 102, It assumes that there is no empty space in which the fluid is not filled.

Meanwhile, in the structure 100 according to the embodiment of the present invention, the flow path is formed to extend in a predetermined direction, for example, the z direction. In addition, the material of the structure 100 and the partition 104 are modeled as being composed of homogeneous materials.

Referring to FIGS. 1 and 2, one layer L2 has a structure in which a flow path 102 filled with cooling water C and a partition wall 104 composed of a homogeneous material of the structure alternate with each other.

If only layer L2 is examined, layer L2 can be regarded as a composite material. A composite is a material made up of one or more components. Composites generally consist of two components: fiber (fiber) and matrix. Where the fibers are contained in the matrix to reinforce the matrix.

Assuming that the structure of the composite material is made to correspond to the structural analysis structure of the present invention, it can be assumed that the flow path 102 of the layer L2 becomes a matrix and the partition wall 104 becomes a fiber. Therefore, the second layer L2 having the flow path 102 has the nature of a composite material composed of a fluid inside the flow path, which is a matrix of cooling water C, and a partition wall 104, which is a fiber that separates the flow path, The characteristics can be obtained.

On the other hand, since the first layer L1 and the third layer L2, which are layers in which the flow path 102 is not formed, are a single homogeneous material, their properties can be obtained by substituting isotropic material properties.

On the other hand, as shown in FIGS. 1 and 2, an anisotropic second layer L2 is laminated on a first isotropic layer L1, and a third isotropic layer L3 is formed on the second layer L2. It becomes possible to form a single structure made of a composite material.

Existing commercial software for structural analysis can perform shell-specific structural analysis corresponding to each layer.

3 is a flowchart illustrating a method of analyzing a fine flow path structure according to an embodiment of the present invention.

Referring to FIG. 3, in the method of analyzing the structure of the microchannel-structured structure, first, the microchannel designing step (S1) is performed to specify the specific microchannel and the actual cross-sectional shape of the microchannel- (Step S2).

Thereafter, the structural analysis method according to the present invention includes a step (S3) of creating an equivalent stiffness model of a layer in which a flow path is formed and a layer in which a flow path is not formed, as described above, (S4) applying the composite shell properties to the equivalent stiffness model.

Here, the modeling means and the computing means may be separate means, or alternatively may be a component of one computing unit.

Further, the structural analysis method according to the present invention includes the step (S4) in which the calculation means performs an operation using the composite module software.

Here, the step S3 of creating the equivalent stiffness model includes the steps of creating the longitudinal layers L1 and L3 in which the flow path is not formed in the isotropic model as described above with reference to Figs. 1 and 2 , And generating the longitudinal layer (L2) in which the flow path is formed as an anisotropic model.

In addition, the step of generating the anisotropic model includes a step of modeling assuming that the flow path 102 is a matrix and the partition 104 defining the flow path is a fiber.

Meanwhile, the parameters of the material properties required for calculating the equivalent anisotropic material coefficient of the composite structure 100 are defined as shown in Table 1 below.

Property variable The partition wall 104, Modulus of elasticity E1 Poisson rain v1 Shear number G1 density ρ1 Bulkhead volume ratio R1 Cooling water (C) Bulk coefficient K2 density ρ2 Cooling channel volume ratio R2

In addition, the physical properties of the composite structure based on the coordinate system shown in Figs. 1 and 2 are defined as shown in Table 2 below.

variable Isotropic material Anisotropic material modulus of elasticity in the x direction Ex E1 See Equation 1 y direction modulus of elasticity O E1 See Equation 1 modulus of elasticity in the z direction Ez E1 See Equation 1 xy plane Poisson rain vxxy v1 See Equation 4 yx plane Poisson ratio vyx v1 See Equation 4 yz plane Poisson rain νyz v1 See Equation 4 zy plane Poisson rain νzy v1 See Equation 4 xz plane Poisson rain vxz v1 See Equation 4 zx plane Poisson ratio vzx v1 See Equation 4 xy plane shear rate Gxy G1 See Equation 2 yz plane shear rate Gyz G1 See Equation 2 zx plane shear rate Gzy G1 See Equation 2 density ρ ρ1 See Equation 5

Under these conditions and definitions, the elastic modulus in the x, y, and z directions is calculated by Equation 1 below.

Here, Ex is the x direction elastic modulus, Ez is the z direction elastic modulus, and Ey is the y direction elastic modulus.

Also, under these conditions and definitions, the respective transfer coefficients for the xz plane, the yz plane, and the zx plane are expressed by the following equation (2).

Here, Gxy denotes the front-end number in the xy plane, Gyz denotes the front-end number of the yz plane, Gzy denotes the front-end number in the zy plane, G1 denotes the front-end number of the isotropic material, G2 is the shear rate of the anisotropic material, and R2 is the volume ratio of the flow channel forming the anisotropic material.

In the case of the anisotropic material including the cooling water which is a fluid filled in the flow path without voids, the modulus of elasticity, Poisson's ratio, and shear number are defined by the following equation (3).

In addition, the equivalent Poisson's ratio in the plane according to the x, y, z coordinate system shown in Figs. 1 and 2 is expressed by the following equation (4).

Under these conditions and the definition, the step of generating the equivalent stiffness model in the structure analysis method of the present invention generates the equivalent density by the following equation (5).

Where r1 is the density of the partition, R1 is the volume ratio of the partition, r2 is the density of the fluid, and R2 is the volume ratio of the fluid.

Referring to FIG. 3, step S5 is a step of performing an operation using an existing commercial composite module. Here, a structure having a complex shape is divided into elements such as a simple shape of a hexahedron or a tetrahedron, A finite element method for obtaining the characteristics of the entire shape can be employed.

Meanwhile, the step S34 of modeling the equivalent stiffness is performed by modeling the second layer L2, which is a composite material, with an anisotropic material composed of a fiber and a matrix. Since such a composite material is in the form of a plate, The shell structure is substituted with a two-dimensional element, and structural analysis is performed.

According to another aspect of the present invention, there is provided a computer-readable medium having recorded thereon a program for performing the structure analysis method as described above.

Alternatively, according to the present invention, there is provided a structural analysis system for performing the structural analysis method as described above.

Alternatively, according to the present invention, there is provided a computer program for performing the structural analysis method as described above.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

100: structure
102: Euro
104:
L1, L2, L3: Layer

Claims (7)

A structure analyzing method for performing a structural analysis of a structure partitioned by a partition and having a plurality of flow paths through which a fluid is to be arranged,
In the structure analysis method,
The modeling means generates the equivalent stiffness model of the longitudinal layer in which the flow path is formed and the longitudinal layer in which the flow path is not formed
Applying a composite shell property to the equivalent stiffness model;
Wherein the calculating means comprises performing an operation using the composite module software. The method according to claim 1,
Wherein the step of generating the equivalent stiffness model comprises:
Generating a longitudinal layer in which the flow path is not formed in an isotropic model;
And generating an anisotropic model of the longitudinal layer in which the flow path is formed. 3. The method of claim 2,
Wherein the step of generating the anisotropic model comprises:
And modeling the partition assuming the flow path as a matrix and assuming the partition defining the flow path as a fiber. The method of claim 3,
Wherein the step of generating the equivalent stiffness model comprises the steps of:

Here, rho 1 is the density of the partition wall, R1 is the volume ratio of the partition wall,
2 is the density of the fluid, and R2 is the volume ratio of the fluid. The method of claim 3,
Wherein the step of generating the equivalent stiffness model comprises the steps of:

Here, Ex is the x direction elastic modulus, Ez is the z direction elastic modulus, and Ey is the y direction elastic modulus. The method of claim 3,
Wherein the step of generating the equivalent stiffness model comprises the steps of:

Where Gxy is the xy plane shear number, Gyz is the yz plane shear number, Gzx is the zx plane shear number,
R1 is the bulkhead volume ratio, and R2 is the volume ratio of the fluid. A computer-readable medium having recorded thereon a program for performing the structural analysis method according to any one of claims 1 to 6.

Images