CN110375949A - A kind of wire wind tunnel test model and its manufacturing method - Google Patents

Abstract

The invention provides a wire wind tunnel test model, which comprises a core body and a plurality of simulation line bodies, wherein the core body is a cylinder, the outer surface of each simulation line body is bonded with the outer surface of the core body, the simulation line bodies are twisted together by taking the core body as a center to form a model with the same appearance as a real wire, the core body and the simulation line bodies are both hot-melt plastic material bodies, the model is easy to form and convenient to manufacture, the weight after cooling and forming is lighter than that of the real wire, and the model has a straight central axis and certain rigidity and is convenient to test; the invention also provides a manufacturing method of the wire wind tunnel test model, which can ensure that the model is 1:1, the real wire is restored, the error of the manufacturing process can be reduced, and the defective rate is reduced.

Description

A kind of wire wind tunnel test model and its manufacturing method

technical field

The invention relates to the technical field of cable aerodynamic tests, in particular to a wire wind tunnel test model and a manufacturing method thereof.

Background technique

With the rapid growth of China's power transmission capacity, it is inevitable to choose split, large-capacity, and long-distance transmission lines. In the calculation of wind deflection and non-synchronous sway of EHV/UHV transmission lines, the main consideration is the shape coefficient of conductors. The shape coefficient of the conductor, also known as the drag coefficient, is a parameter only related to the structure shape. In the structural design of transmission lines, the shape coefficient directly affects the calculation results of the wind load of the conductor, and then affects the structural design load value and affects the design results. At present, the wind tunnel test is the most effective and direct means to study the shape coefficient of wires.

Existing wires are usually formed by twisting multiple wires around a central wire. However, the real wire has greater flexibility. In the wind tunnel test, the central axis of the wire is not on the same horizontal line, and the wire is made of metal, which is heavy. It is difficult for the force balance to match its weight. The experiment has certain difficulties and errors.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a wire wind tunnel test model, which is easy to test and convenient to manufacture.

In order to solve the above-mentioned technical problems, the wire wind tunnel test model provided by the present invention includes a core body and a plurality of simulated wire bodies, the core body is a cylinder, and the outer surface of the simulated wire body is connected to the outer surface of the core body. Bonding, a plurality of the simulated wires are twisted together with the core as the center to form a model with the same shape as the real wire, and the core and the simulated wires are both made of hot-melt plastic material.

As a preferred solution, the core body is a hollow cylinder.

As a preferred solution, the ratio of the thickness of the core to the diameter of the core is not less than 1:10.

As a preferred solution, both the core body and the simulated wire body are resin bodies.

The present invention also provides a method for making the above-mentioned wire wind tunnel test model, comprising the steps of:

Step 1: Scanning and measuring the real wire that needs to be tested in a wind tunnel or obtaining the pitch diameter ratio, torsion angle, number of single wire strands, and cross-sectional size parameters of the real wire according to the design data of the real wire;

Step 2: Modeling in 3D software according to the data in step 1 to obtain a wire wind tunnel test model in which the core is a cylinder and a plurality of simulated wires are twisted together with the core as the center;

Step 3, according to the modeling in step 2, use a 3D printing device to print layer by layer along the axial direction of the wire wind tunnel test model.

As a preferred solution, in step 2, the core body is designed as a hollow cylinder.

As a preferred solution, in step 3, the printing accuracy of the 3D printing device is adjusted so that the surface roughness of the wire wind tunnel test model is similar to that of a real wire.

As a preferred solution, in step 3, after the wire wind tunnel test model is cooled and shaped, the surface of the wire wind tunnel test model is sprayed with metallic paint.

The beneficial effects of the present invention are as follows:

1. In the present invention, a plurality of simulated wire bodies are stranded with the core body as the center to form a model with the same shape as the real wire, so as to ensure the consistency between the model and the real wire, and to obtain an accurate shape coefficient coefficient only related to the shape of the wire. Hole test results; the core body of the present invention adopts a cylinder, which plays a role of connection and support, has a straight central axis, solves the problem that the central axis of the real wire is not on the same horizontal line due to its flexibility, and is convenient for testing; and The bonding of the core body and the simulated wire body of the present invention can prevent the test error caused by the use of other connection devices, and ensure that the shape of the model is consistent with that of the real wire; in addition, the model of the present invention is made of hot-melt plastic material, which is easy to form and convenient to manufacture , and the weight after cooling and forming is lighter than the real wire, and has a certain rigidity, which is convenient for testing.

2. The core body of the present invention is a hollow cylinder, which can further reduce the weight of the model and facilitate testing. Since the core body supports and connects the simulated wire body, the simulated wire body is solid and has a certain weight. Therefore, the diameter-to-thickness ratio of the core body is not less than 1/10 to prevent the core body from being too thin and broken. Through the 3D printing technology, the present invention enables the model to restore the real wire at 1:1, and can reduce the error in the production process and reduce the rate of defective products.

Description of drawings

FIG. 1 is a schematic diagram of a first viewing angle of a wire wind tunnel test model of an embodiment.

Fig. 2 is a schematic diagram of a second viewing angle of the wire wind tunnel test model of the embodiment.

Fig. 3 is a schematic diagram of the end face of the wire wind tunnel test model of the embodiment.

The reference signs are as follows:

1-core body, 2-analog wire body.

Detailed ways

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying Describes, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

1 to 3, the wire wind tunnel test model of the present embodiment includes a core body 1 and a plurality of simulated wire bodies 2, the core body 1 is a cylinder, and the outer surface of the simulated wire body 2 is bonded to the outer surface of the core body 1. Then, a plurality of simulated wire bodies 2 are twisted around the core body 1 to form a model with the same shape as the real wire, and the core body 1 and the simulated wire body 2 are both made of hot-melt plastic material. In this embodiment, a plurality of simulated wire bodies 2 are stranded around the core body 1 to form a model with the same shape as the real wire. Consistency with the real wire, to obtain accurate wind tunnel test results that are only related to the shape coefficient of the wire; the core body 1 of this embodiment adopts a cylinder, which plays a role of connection and support, and has a straight central axis. It solves the problem that the central axis of the real wire is not on the same horizontal line due to its flexibility, which is convenient for testing; and the bonding of the core 1 body and the simulated wire body 2 in this embodiment can prevent test errors caused by using other connecting devices and ensure The shape of the model is consistent with that of the real wire; in addition, the model of the present invention is made of hot-melt plastic material, which is easy to form and convenient to manufacture, and the weight after cooling and molding is lighter than the real wire, has a certain rigidity, and is convenient for testing.

Furthermore, the core body 1 is a hollow cylinder, which can further reduce the weight of the model and facilitate the test. The ratio of the thickness of the core body 1 to the diameter of the core body 1 is not less than 1:10, so as to prevent the core body 1 from being broken if the thickness is too small. In addition, both the core body 1 and the simulated wire body 2 are resin bodies, which reduces production costs.

The present embodiment also provides a method for making the above-mentioned wire wind tunnel test model, including the following steps:

Step 1. Scanning and measuring the real wires that need to be tested in the wind tunnel or according to the design data of the real wires, obtain the pitch-diameter ratio, torsion angle, number of single wire strands and cross-sectional size parameters of the real wires;

Step 2: Modeling in 3D software based on the data in step 1 to obtain a model in which the core body 1 is a cylinder and multiple simulated wire bodies 2 are twisted together around the core body 1, and the core body 1 is designed to be hollow barrel;

Step three, according to the modeling in step two, use the 3D printing device to print layer by layer along the axial direction of the wire wind tunnel test model. Adjust the printing accuracy of the 3D printing device so that the surface roughness of the wire wind tunnel test model is similar to that of the real wire. And, after the wire wind tunnel test model is cooled and formed, the surface of the wire wind tunnel test model is sprayed with metallic paint. In this embodiment, a long rod is passed through the hollow core body 1, and the core body 1 is rotated, while the metal paint is sprayed to ensure Spraying evenly, the metallic paint layer enables the simulation to further simulate the surface roughness of real wires.

The manufacturing method of the wire wind tunnel test model in this embodiment uses 3D printing technology, so that the model can restore the real wire at 1:1, and it can avoid the process of making the core body 1 and the simulated wire body 2 separately and then bonding them together. The problem of reducing the error in the production process and reducing the rate of defective products.

To sum up, in this embodiment, a plurality of simulated wire bodies 2 are stranded around the core body 1 to form a model with the same shape as the real wire, so as to ensure the consistency between the model and the real wire, and to obtain an accurate model that is only related to the shape of the wire. The wind tunnel test results of the body shape coefficient; the core body 1 of this embodiment adopts a cylinder, which plays the role of connection and support, and has a straight central axis, which solves the problem that the central axis of the real wire is not on the same horizontal line due to its flexibility. problem, it is convenient for testing; and the bonding of the core 1 body and the simulated wire body 2 in this embodiment can prevent the test error caused by the use of other connecting devices, and ensure that the model is consistent with the shape of the real wire; in addition, the model of the present invention uses hot-melt Non-toxic plastic material, easy to form and convenient to manufacture, and the weight after cooling and forming is lighter than the real wire, with a certain rigidity, which is convenient for testing. In addition, this embodiment also provides a method for making a wire wind tunnel test model by using 3D printing technology, which can reduce the rate of defective products.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and replacements can also be made without departing from the technical principle of the present invention, and these improvements and replacements should also be It is regarded as the protection scope of the present invention.

Claims (8)

1. a kind of conducting wire model in wind tunnel, which is characterized in that including core and multiple simulation wire bodies, the core is cylinder The outer surface of body, the simulation wire body is Nian Jie with the outer surface of the core, during multiple simulation wire bodies with the core are The heart twists together to form model identical with the shape of true conducting wire, and the core and the simulation wire body are hot melt modeling Glue material Material.

2. conducting wire model in wind tunnel according to claim 1, which is characterized in that the core is hollow cylinder.

3. conducting wire model in wind tunnel according to claim 2, which is characterized in that the thickness of the core is straight with the core The ratio of diameter is not less than 1:10.

4. conducting wire model in wind tunnel according to claim 1, which is characterized in that the core and the simulation wire body are tree Rouge body.

5. a kind of production method of conducting wire model in wind tunnel as claimed in claim 1, which comprises the steps of:

Step 1 is scanned the true conducting wire for needing to carry out wind tunnel test, measures or setting according to the true conducting wire It counts, obtains lay ratio, torsion angle, single line number of share of stock and the sectional dimension parameter of the true conducting wire；

Step 2 models in three-dimensional software according to the data of step 1, and obtaining core is cylindrical body, multiple simulation wire bodies with core The conducting wire model in wind tunnel twisted together centered on body；

Step 3, according to the modeling of step 2 by 3D printing device along the axial successively printing of the conducting wire model in wind tunnel Molding.

6. the production method of conducting wire model in wind tunnel according to claim 5, which is characterized in that, will be described in step 2 Core design is hollow cylinder.

7. the production method of conducting wire model in wind tunnel according to claim 5, which is characterized in that in step 3, adjust 3D The printing precision of printing equipment keeps the surface roughness of the conducting wire model in wind tunnel similar to true conducting wire.

8. the production method of conducting wire model in wind tunnel according to claim 5, which is characterized in that in step 3, to described After conducting wire model in wind tunnel is cooled and shaped, painted in the surface spray metal of the conducting wire model in wind tunnel.