A method for calculating spline telescoping

Abstract

The present application relates to the technical field of aeronautical machinery transmission design, and particularly relates to a spline telescopic amount calculation method. The method comprises the following steps: S1, simplifying the system into a simulation model; S2, inputting the deformation amount of the first connecting device (200) and the second connecting device (300) in the system into the simulation model to obtain the positions of the center points and reference points of the first connecting device (200) and the second connecting device (300) after deformation; S3, performing simulation calculation according to the simulation model in the step S1 to obtain the position of the center point of the target device (100) after deformation; and S4, simulating and calculating the maximum telescopic amount of the splines at both ends of the target device (100) according to the connection relationship after deformation of the first connecting device (200), the second connecting device (300) and the target device (100). The present application simplifies the system model, and only needs to provide the deformation amount of the connected device of the spline to simulate and calculate the maximum telescopic amount of the spline through software modeling, so that more reliable data reference can be provided in the preliminary design stage of the system, and cost is saved.

Description

Technical Field

[0001] This invention relates to the field of aerospace mechanical transmission design technology. When the system transmits torque, it is necessary to ensure a certain amount of overlap of the splines when the structure deforms or the temperature changes. Specifically, this invention relates to a method for calculating the spline expansion and contraction during system design. Background Technology

[0002] Currently, torque is generally transmitted through hydraulic motors, torsion bars, support components, and actuators. However, considering the actual aircraft envelope, high and low temperature environments, and airframe deformation under aerodynamic loads, these components are connected by splines to adapt to these conditions.

[0003] To ensure sufficient overlap, deformation and environmental influences must be fully considered during the design process. Currently, the spline expansion and contraction can be measured using specialized measuring equipment, but this is costly and cumbersome. Furthermore, the measurement results may not accurately reflect the maximum expansion and contraction caused by system deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a method for calculating the spline expansion and contraction, which calculates the maximum expansion and contraction of the spline by software modeling and simulation under the condition that the deformation of the equipment connected by the spline is known.

[0005] This method is implemented through the following technical solution:

[0006] To achieve the above-mentioned objective, a method for calculating spline extension is proposed. The method is used in a transmission or connection component or system with splines, the system comprising a target device 100, a first connecting device 200, and a second connecting device 300; the target device is connected at both ends to the first connecting device 200 and the second connecting device 300 respectively via internal and external splines; two reference points are symmetrically positioned on the side where the first connecting device 200 and the second connecting device 300 are connected to the target device 100, and the reference points on the first connecting device 200 and the second connecting device 300 are coplanar with the center points of the first connecting device 200, the second connecting device 300, and the target device 100;

[0007] The calculation method specifically includes the following steps:

[0008] S1: Simplify the system into a simulation model; the simplified simulation model includes the target device 100, the center point of the first connecting device 200 and the second connecting device 300, the reference point on the first connecting device 200 and the second connecting device 300, and the connection points between the first connecting device 200, the second connecting device 300 and the two ends of the target device 100.

[0009] S2: Based on the deformation of the first connecting device 200 and the second connecting device 300 in the system, input the deformation into the simulation model to obtain the positions of the center point and reference point of the first connecting device 200 and the second connecting device 300 after deformation in the simulation model;

[0010] S3: Perform simulation calculations based on the simulation model in step S1 to obtain the position of the deformed center point of the target device 100 in the simulation model;

[0011] S4: The maximum extension and retraction of the splines at both ends of the target device 100 is calculated by simulation based on the connection relationship between the first connecting device 200, the second connecting device 300 and the target device 100 after deformation.

[0012] In one possible embodiment, step S1 specifically includes the following steps:

[0013] S101: In the simplified simulation model of the system, the first reference point on the first connecting device 200 is denoted as A, the second reference point as B, and the center point as a; the first reference point on the second connecting device 300 is denoted as C, the second reference point as D, and the center point as b; the center point of the target device 100 is denoted as O, and the connection points between its two ends and the first connecting device 200 and the second connecting device 300 are denoted as G, H, and D, respectively; line segments connect A, B, C, and D, and line segments connect a, G, O, H, and b;

[0014] S102: In the simplified system model, take the center point O of the target device 100 as the origin and draw a normal line relative to the axis GH of the target device 100, which intersects AC and BD at E and F.

[0015] In one possible embodiment, step S3 specifically includes:

[0016] In the simplified simulation model of the system, the positions of E' and F' after deformation are simulated and calculated based on the position ratio of point E on AC and the position ratio of point F on BD, respectively; the position of O' after deformation is simulated and calculated based on the position ratio of point O on EF, thus obtaining the position of the target device G'H'.

[0017] In one possible embodiment, step S4 specifically includes the following steps:

[0018] S401: The first connecting device 200 and the target device 100 connecting segment aG, after deformation, the first connecting device 200 and the target device 100 connecting segment a'G'; the second connecting device 300 and the target device 100 connecting segment bH, after deformation, the second connecting device 300 and the target device 100 connecting segment b'H';

[0019] S402: Calculate the spline extension amounts L1 and L2 at both ends of the target device 100 according to the following formula.

[0020] L1 = a'G' - aG

[0021] L2 = b'H' - bH (Equation 1)

[0022] Furthermore, positive L1 and L2 values ​​indicate stretching, while negative L1 and L2 values ​​indicate contraction.

[0023] In one possible embodiment, the GH segment is a rigid segment.

[0024] In one possible embodiment, the spline extension calculation method is applied to the transmission of an aircraft flap system.

[0025] This method has the following beneficial effects:

[0026] This invention simplifies the system model. Under the condition that the deformation of the equipment connected by the spline is known, the maximum expansion and contraction of the spline can be calculated by software modeling and simulation. The calculated value can provide a relatively reliable data reference in the preliminary design stage of the system. At the same time, it effectively saves costs and does not require tooling equipment for measurement. Attached Figure Description

[0027] Figure 1 This is an example diagram of the system structure of the present invention;

[0028] in:

[0029] 100 - Target device, 200 - First connecting device, 300 - Second connecting device;

[0030] Figure 2 This is a schematic diagram of the simulation model after the simplification of modeling using this method;

[0031] Figure 3 This is a schematic diagram of the system structure of a specific embodiment of the present invention.

[0032] Wherein: 1-left torsion bar universal joint, 2-left torsion bar internal spline, 3-left external spline of support bearing, 4-support bearing connector, 5-right external spline of support bearing, 6-right internal spline of torsion bar, 7-right torsion bar universal joint. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

[0034] A method for calculating spline extension / retraction, using a transmission component in the flap system of a certain aircraft model as an example, such as... Figure 3 As shown, the transmission components are as follows: left torsion bar universal joint 1, left torsion bar internal spline 2, support bearing left external spline 3, support bearing connector 4, support bearing right external spline 5, right torsion bar internal spline 6, right torsion bar universal joint 7.

[0035] The right end of the left torsion bar is a universal joint 1 connector connected to the internal spline 2 via a locking rivet;

[0036] The internal spline 2 meshes with the left external spline 3 of the support bearing via involute teeth;

[0037] The right external spline 5 of the support bearing meshes with the right internal spline 6 of the torsion bar via involute teeth.

[0038] The right-side torsion bar's left end universal joint 7 connector is connected to the internal spline 6 via a locking rivet;

[0039] Based on the connection relationships in the example, the connection model was simplified through software modeling. Here, EF represents the intersection line between the corresponding product's support bearing connector's position on the wing and the wing's rear sparsity; A and C are the upper intersection points of the two side trailing edge ribs and the wing's rear sparsity; B and D are the lower intersection points of the two side trailing edge ribs and the wing's rear sparsity; a is the left end point of the left torsion bar; b is the right end point of the right torsion bar; GH is the axial dimension of the component; and point O is the mounting point of the corresponding component's wing position, its projection onto the rear sparsity surface being point O. 投 EF is the intersection of the component's station surface and the rear beam;

[0040] The positions of A', B', C', and D' after wing deformation are calculated based on the changes in the intersection points A, B, C, and D of the trailing edge rib and the rear sparsity after wing deformation.

[0041] The positions of E' and F' after wing deformation are calculated based on the ratios of E and F on AC and BD.

[0042] The projection of point O' onto the rear beam surface is calculated based on the proportion of O projected onto EF.

[0043] The position of O' is calculated based on the straight-line distance from O to the rear beam;

[0044] The difference in length of the torsion bar after deformation is calculated based on the difference between aG and a'G'.

[0045] The spline's expansion allowance is calculated by considering the component's installation error, the spline's machining error, and the difference between aG and a'G'.

[0046] If the stiffness of component GH is insufficient in this method, the positions of the intersection of points G and H with the rear beam can be calculated according to the above calculation method, and the position of the wing after deformation can be calculated according to its proportion on AC and BD. Then, the positions of G' and H' can be calculated.

[0047] Similarly, this method can be used to preliminarily calculate the angle difference between the front and rear of the torsion bar under the deformation of the wing, and then calculate the angle margin of the universal joint.

[0048] This invention simplifies the system model. Under the condition that the deformation of the equipment connected by the spline is known, the maximum expansion and contraction of the spline can be calculated by software modeling and simulation. The calculated value can provide a relatively reliable data reference in the preliminary design stage of the system. At the same time, it effectively saves costs and does not require tooling equipment for measurement.

Claims

1. A method for calculating spline stretching, characterized in that, For use in a transmission system with splines, the system includes a target device (100), a first connecting device (200), and a second connecting device (300); the two ends of the target device are connected to the first connecting device (200) and the second connecting device (300) respectively via internal and external splines; two reference points are respectively provided at symmetrical positions on the side where the first connecting device (200) and the second connecting device (300) are connected to the target device (100), and the reference points on the first connecting device (200) and the second connecting device (300) are coplanar with the center point of the first connecting device (200), the second connecting device (300), and the target device (100); The calculation method specifically includes the following steps: S1: Simplify the system into a simulation model; the simplified simulation model includes the target device (100), the center point of the first connecting device (200), the second connecting device (300), the reference points on the first connecting device (200) and the second connecting device (300), and the connection points between the first connecting device (200), the second connecting device (300) and the two ends of the target device (100); S2: Based on the deformation of the first connecting device (200) and the second connecting device (300) in the system, input the deformation into the simulation model to obtain the positions of the center point and reference point of the first connecting device (200) and the second connecting device (300) after deformation in the simulation model; S3: Perform simulation calculations based on the simulation model in step S1 to obtain the position of the deformed center point of the target device (100) in the simulation model; S4: The maximum extension and retraction of the splines at both ends of the target device (100) is calculated by simulation based on the connection relationship between the first connecting device (200), the second connecting device (300) and the target device (100) after deformation.

2. The method for calculating spline extension / retraction according to claim 1, characterized in that, Step S1 specifically includes the following steps: S101: In the simplified simulation model of the system, the first reference point on the first connecting device (200) is denoted as A, the second reference point as B, and the center point as a; the first reference point on the second connecting device (300) is denoted as C, the second reference point as D, and the center point as b; the center point of the target device (100) is denoted as O, and the connection points between its two ends and the first connecting device (200) and the second connecting device (300) are denoted as G and H, respectively; line segments connect A, B, C, and D, and line segments connect a, G, O, H, and b; S102: In the simplified system model, take the center point O of the target device (100) as the origin and draw a normal line relative to the axis GH of the target device (100), which intersects AC and BD at E and F.

3. The method for calculating spline extension / retraction according to claim 2, characterized in that, The specific steps of step S3 include: in the simplified simulation model of the system, the positions of E' and F' after deformation are simulated and calculated according to the position ratio of point E on AC and the position ratio of point F on BD respectively; the position of O' after deformation is simulated and calculated according to the position ratio of point O on EF, and the position of the target device (100)G'H' is further obtained.

4. The method for calculating spline extension / retraction according to claim 3, characterized in that, Step S4 specifically includes the following steps: S401: Based on the connection relationship between the first connecting device (200), the second connecting device (300) and the target device (100) after deformation, the lengths of the connection segments aG and a'G' of the first connecting device (200) and the target device (100) before and after deformation are calculated by simulation. And the lengths of the connection segments bH and b'H' between the second connecting device (300) and the target device (100) before and after deformation; S402: Calculate the spline extension amounts L1 and L2 at both ends of the target device (100) according to the following formula; L1 = a'G' - aG L2 = b'H' - bH (Formula 1) 5. The method for calculating spline stretching according to claim 4, characterized in that, Positive values ​​for L1 and L2 indicate stretching, while negative values ​​indicate contraction.

6. The method for calculating spline extension / retraction according to claim 3, characterized in that, The GH segment is a rigid segment.

7. A method for calculating spline stretching according to any one of claims 1-6, characterized in that, This method is applied to the transmission of aircraft flap systems.

8. The method for calculating spline stretching according to claim 1, characterized in that, The target device (100) is a support bearing.

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