Three-dimensional space oil passage modeling method for fuel control device shell

Abstract

The application belongs to the technical field of aero-engine fuel control and discloses a three-dimensional space oil passage modeling method for a fuel control device shell. The method comprises the following steps: taking a set cross section of a pipeline where an oil passage hole is located as a reference, taking a center of the cross section as a coordinate origin, and establishing a three-dimensional orthogonal coordinate system OXYZ with the cross section as an XOY plane; the oil passage hole is located above the set cross section; the XOY plane in the three-dimensional orthogonal coordinate system is offset upward to form a reference plane 1; a two-dimensional circle model is established on the reference plane 1; a reference axis with the center of the circle as an end point is established on the two-dimensional circle; the reference plane is rotated by a preset angle with the reference axis as a rotation axis to form a reference plane 2, a target hole is established on the reference plane 2, and the positioning reference of the target hole is the center of the two-dimensional circle, so that a modeling result of a three-dimensional oil passage hole is obtained, and accurate positioning of drawing marking is realized by using an orthogonal positioning method.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine fuel control technology, and particularly relates to a three-dimensional space oil circuit modeling method for the housing of a fuel control device. Background Technology

[0002] In the product design process of aero-engine fuel control devices, it is necessary to perform three-dimensional modeling of the casing, which involves the design of numerous three-dimensional space oil circuits. The existing method for drawing three-dimensional space oil circuits is as follows:

[0003] Step 1: In an orthogonal coordinate system, deflect one of the reference planes (one of the three reference planes XY, YZ, and XZ) to form a new reference plane (assumed to be reference plane 1);

[0004] Step 2: Offset the reference plane 1 by a certain distance (this distance is the target distance) to obtain the reference plane 2;

[0005] Step 3: Model the oil circuit on the reference plane 2.

[0006] 2. Although the existing three-dimensional space oil circuit drawing method can realize model building, when locating oil circuit holes, there will be a problem that the number is not an integer, and rounding is required. Summary of the Invention

[0007] This invention proposes a three-dimensional space oil circuit modeling method for the housing of a fuel control device, which uses orthogonal positioning to achieve accurate positioning of drawing annotations.

[0008] To achieve the above objectives, the present invention employs the following technical solution.

[0009] A method for three-dimensional spatial oil circuit modeling of a fuel control device housing, the method comprising:

[0010] S1, taking the set cross-section of the pipe where the oil passage hole is located as the reference, and taking the center of the cross-section as the origin of the coordinate system, and the cross-section as the XOY plane, a three-dimensional orthogonal coordinate system OXYZ is established; the oil passage hole is located above the set cross-section.

[0011] S2, shift the XOY plane in the three-dimensional orthogonal coordinate system upward to form reference plane 1;

[0012] S3, Establish a two-dimensional circle model on the reference plane 1;

[0013] S4. On a two-dimensional circle, establish a reference axis with the center of the circle as its endpoint;

[0014] S5, using the reference axis as the rotation axis, rotate the reference plane by a preset angle to form reference plane 2;

[0015] S6, a target hole is established on the reference plane 2. The positioning reference of the target hole is the center of the two-dimensional circle, thereby obtaining the modeling result of the three-dimensional oil passage hole.

[0016] The features and further improvements of the first technical solution of the present invention are as follows:

[0017] (1) In S2, the upward offset of the XOY surface is the vertical distance between the center of the designed oil passage hole and the XOY surface.

[0018] (2) In S3, the position of the two-dimensional circular model is determined according to the projection of the designed oil passage hole on the XOY plane.

[0019] (3) In S4, the positioning angle of the ray is the angle corresponding to the vertical line of the section position of the projection of the designed oil passage hole on the XOY plane.

[0020] (4) In S5, the preset angle is the complementary angle between the center of the designed oil passage hole and the plane of the hole opening.

[0021] (5) If the oil passage hole needs to be far away from the pipeline, simply increase the projection distance of the oil passage hole on the XOY plane in S3.

[0022] (6) If the designed oil passage hole needs to be inclined towards the pipeline, simply reduce the preset angle in S5.

[0023] (7) If the designed oil passage hole needs to be moved to the bottom of the pipe, simply reduce the offset in S2.

[0024] This invention can accurately locate the oil passage hole in three-dimensional space, avoiding product quality problems caused by oil passage control positioning deviation in the three-dimensional model in the early stage of product design, and providing a guarantee for the accuracy of product design. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the establishment of a three-dimensional orthogonal coordinate system OXYZ in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of establishing reference plane 1 in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram illustrating the establishment of a two-dimensional circular model in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention.

[0028] Figure 4 A schematic diagram of reference axis 1 in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of establishing reference plane 2 in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of establishing a target hole in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention. Figure 1 ;

[0031] Figure 7 This is a schematic diagram of establishing a target hole in a three-dimensional space oil circuit modeling method for a fuel control device housing provided in an embodiment of the present invention. Figure 2 . Detailed Implementation

[0032] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] While existing 3D spatial oil passage mapping methods can achieve model building, they encounter issues with non-integer positioning of oil passage holes, requiring rounding. This occurs because these methods rely on polar coordinate positioning. When using orthogonal annotation methods on engineering drawings, non-integer data results in design errors due to 3D model inaccuracies. This invention addresses this by employing orthogonal positioning to achieve precise positioning of annotations on drawings.

[0034] To address the issue of accurate positioning of oil passage holes during the 3D model building process based on UG software, this invention provides a 3D spatial oil passage modeling method for the housing of a fuel control device, which will be implemented using the following steps:

[0035] Step 1: Offset one of the three reference planes (XY, YZ, XZ) in the orthogonal coordinate system to form reference plane 1. The offset of reference plane 1 is the target positioning dimension. For example, if the distance of the oil passage hole relative to the absolute origin in this offset direction is 50mm, then the offset is 50mm. Figure 1 As shown.

[0036] Step 2: Establish a draft based on reference plane 1. Figure 1 ,like Figure 2 As shown.

[0037] Step 3: On the grass Figure 1 Create a two-dimensional circle model 1. Circle 1 is positioned to represent the remaining dimensions of the target hole in the other two directions, as shown below. Figure 3 As shown.

[0038] Step 4: On this two-dimensional circle, it is recommended to draw a straight line 1 with a distance of 0mm from the center. This line should be positioned using polar coordinates, with the positioning angle being the section position of the target hole on the two-dimensional projection plane. Figure 4As shown.

[0039] Step 5: Exit the grass Figure 1 Establish reference axis 1 with line 1 as the reference.

[0040] Step 6: Using reference axis 1 as the axis of rotation, rotate reference plane 1 by an angle (this angle is the complementary angle between the target hole axis and the hole opening plane) to form reference plane 2, as shown below. Figure 5 As shown.

[0041] Step 7: Establish the target hole on reference plane 2. The positioning reference for the target hole is the center of circle 1, as shown below. Figure 6 and Figure 7 As shown.

[0042] Furthermore, after the target hole is modeled using this method, if subsequent improvements or optimizations are needed for the five positional features, simply modify the positioning dimensions of these five locations. For example, if the hole needs to be moved away from the pipe, simply increase the dimension by 40 or 32; if the hole needs to be tilted towards the pipe, simply decrease the angle by 70°; and if the hole needs to be moved towards the bottom of the pipe, simply decrease the dimension by 80, and vice versa. This achieves editability, facilitating design optimization.

[0043] This invention has been applied to the design of accessory oil circuits in the fuel control systems of various types of aero engines. It is simple to operate, accurate in positioning, and improves design precision.

[0044] This invention can accurately locate the oil passage hole in three-dimensional space, avoiding product quality problems caused by oil passage control positioning deviation in the three-dimensional model in the early stage of product design, and providing a guarantee for the accuracy of product design.

Claims

1. A method for modeling the three-dimensional oil circuit of a fuel control device housing, characterized in that, The method includes: S1, taking the set cross-section of the pipe where the oil passage hole is located as the reference, and taking the center of the cross-section as the origin of the coordinate system, and the cross-section as the XOY plane, a three-dimensional orthogonal coordinate system OXYZ is established; the oil passage hole is located above the set cross-section. S2, offset the XOY plane in the three-dimensional orthogonal coordinate system upward to form reference plane 1; the upward offset of the XOY plane is the vertical distance from the center of the designed oil passage hole to the XOY plane; S3, establish a two-dimensional circular model on the reference plane 1; the position of the two-dimensional circular model is determined according to the projection of the designed oil passage hole on the XOY plane; S4. On a two-dimensional circle, establish a reference axis with the center of the circle as the endpoint; the positioning angle of the reference axis is the angle corresponding to the perpendicular line of the section position of the projection of the designed oil passage hole on the XOY plane. S5, using the reference axis as the rotation axis, rotate the reference plane 1 by a preset angle to form the reference plane 2; the preset angle is the complementary angle between the designed oil passage hole axis and the hole opening plane; S6, a target hole is established on the reference plane 2. The positioning reference of the target hole is the center of the two-dimensional circle, thereby obtaining the modeling result of the three-dimensional oil passage hole; If the designed oil passage hole needs to be far away from the pipeline, simply increase the projection distance of the oil passage hole on the XOY plane in S3; if the designed oil passage hole needs to be tilted towards the pipeline, simply decrease the preset angle in S5; if the designed oil passage hole needs to be moved towards the bottom of the pipeline, simply decrease the offset in S2.

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