阅读说明：本技术 一种活动面静力载荷试验中支点变形施加方法 (Fulcrum deformation applying method in movable surface static load test ) 是由 陈军 侯瑞 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种活动面静力载荷试验中支点变形施加方法,包括：在活动面的剖面中,建立活动面与试验设备连接处的根部支点的支点局部坐标系；在所述支点坐标系下,通过有限元分析得到除了两端根部支点之外的其余根部支点在受载后的变形量,并得到根部支点在受载变形后的位置坐标；基于所述坐标位置,确定所述其余根部支点在所述支点局部坐标系不同坐标轴方向的相对变形量；在活动面静力载荷试验中,利用试验设备安装好活动面后,按照所确定的相对变形量对各根部支点施加变形约束。该方法保证了试验的准确性,又大大降低了对试验支持装置的要求,不需要通过支持夹具大行程调节,一方面确保了试验精度,另一方面也降低了实施难度。(The invention discloses a fulcrum deformation applying method in an active surface static load test, which comprises the following steps: establishing a fulcrum local coordinate system of a root fulcrum at the joint of the movable surface and the test equipment in the section of the movable surface; under the fulcrum coordinate system, obtaining the deformation of the other root fulcrums except the root fulcrums at the two ends after being loaded through finite element analysis, and obtaining the position coordinates of the root fulcrums after being loaded and deformed; determining relative deformation of the rest root supporting points in different coordinate axis directions of the supporting point local coordinate system based on the coordinate position; in the static load test of the movable surface, after the movable surface is installed by using test equipment, deformation constraint is applied to each root fulcrum according to the determined relative deformation. The method ensures the accuracy of the test, greatly reduces the requirements on the test supporting device, does not need to adjust through a large stroke of the supporting clamp, ensures the test precision on one hand, and reduces the implementation difficulty on the other hand.)

1. A fulcrum deformation applying method in an active surface static load test is characterized by comprising the following steps:

establishing a fulcrum local coordinate system of a root fulcrum at the joint of the movable surface and the test equipment in the section of the movable surface;

under the fulcrum coordinate system, obtaining the deformation of the other root fulcrums except the root fulcrums at the two ends after being loaded through finite element analysis, and obtaining the position coordinates of the root fulcrums after being loaded and deformed;

determining relative deformation of the rest root supporting points in different coordinate axis directions of the supporting point local coordinate system based on the coordinate position;

in the static load test of the movable surface, after the movable surface is installed by using test equipment, deformation constraint is applied to each root fulcrum according to the determined relative deformation.

2. The fulcrum deformation applying method in the active surface static load test according to claim 1, wherein the test equipment comprises a bearing wall, a supporting clamp, an active surface and loading equipment, wherein:

each fulcrum of the movable surface is arranged on the bearing wall by using a supporting clamp in a mode of lug butt joint, wherein the fulcrum comprises a root fulcrum closest to the supporting clamp; the root fulcrums are numbered from 1 to N in sequence along the extension direction of the movable surface;

the supporting clamp comprises a slideway fixed on the bearing wall along the vertical direction and a clamping piece assembled in the slideway, the end part of the clamping piece is fixed with the movable surface, the clamping piece is provided with a telescopic mechanism, and the relative distance between the clamping piece and the bearing wall is adjusted through the telescopic mechanism; the vertical position of the movable surface is adjusted through the sliding of the clamping piece in the slideway.

3. The method for applying fulcrum deformation in the static load test of the movable surface according to claim 1, wherein in the section of the movable surface, establishing a fulcrum local coordinate system of a root fulcrum at the joint of the movable surface and the test equipment comprises:

establishing a fulcrum local coordinate system, wherein the origin O of the coordinate system is positioned at the root fulcrum of the movable surface connected with the supporting clamp, the Z axis is perpendicular to the lug plane at the fulcrum and points to the tip of the movable surface along the expansion direction of the movable surface, the X axis is perpendicular to the front beam plane in the movable surface and points to the direction of the bearing wall, the Y axis is determined by a right-hand coordinate system, and the subsequent fulcrum deformation calculation and application are carried out under the coordinate system

4. The method for applying fulcrum deformation in the active surface static load test according to claim 1, wherein the obtaining of the position coordinates of the root fulcrum after the fulcrum deformation under load comprises:

let the coordinate of any root fulcrum i except the root fulcrums 1 and N at the two ends be (X)_i，Y_i，Z_i) And obtaining the deformation (delta X) of the root fulcrum i after loading through finite element analysis and calculation_i，ΔY_i，ΔZ_i) The position coordinate of the root fulcrum i of the movable surface after the deformation under load is (X)_0i，Y_0i，Z_i) Wherein X is_0i＝X_i+ΔX_i、Y_0i＝Y_i+ΔY_i。

5. The method for applying the deformation of the fulcrum in the static load test of the active surface according to claim 1, wherein the determining the relative deformation of the rest of the root fulcrums in the directions of different coordinate axes of the fulcrum local coordinate system based on the coordinate positions comprises:

the movable surface deforms and then the root fulcrums 1 at the two endsAnd N is a straight line, and the equation of the straight line projected into the XZ plane is A₁Z+B₁X+C₁0, where coefficient A₁、B₁、C₁Can be determined by the coordinates (X) of the fulcrums 1 and N₀₁，Z₁) And (X)_0N，Z_N) Calculating to obtain; the relative deformation amount of the root fulcrum i in the X directionIs composed of

6. The method for applying fulcrum deformation in an active surface static load test according to claim 5, wherein the relative deformation further comprises:

the pivots 1 and N of the root parts at the two ends of the deformed movable surface are taken as a straight line, and the equation of the straight line projected to the YZ plane is A₂Z+B₂Y+C₂0, where coefficient A₂、B₂、C₂From the coordinates (Y) of the fulcrums 1 and N₀₁，Z₁) And (Y)_0N，Z_N) Calculating to obtain; the relative deformation amount of the root fulcrum i in the Y directionIs composed of

7. The method for applying fulcrum deformation in the active surface static load test according to claim 1, wherein the applying deformation constraint to each fulcrum according to the determined relative deformation comprises:

after the movable surface is installed, 0 deformation constraint is applied to root fulcrums 1 and N in XYZ 3 directions, and root fulcrum i in the X directionDeformation, applied in the Y directionDeformation, 0 deformation is applied in the Z direction.

8. The method for applying fulcrum deformation in an active surface static load test according to claim 1, wherein the method is loaded in a memory of a computer in the form of a computer program, the computer comprises a processor and the memory, and the processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program.

9. The method for applying fulcrum deformation in an active surface static load test according to claim 1, wherein the method is loaded in a computer-readable storage medium in the form of a computer program, and the computer program, when executed by a processor, implements the steps of the method according to any one of claims 1 to 7.

Technical Field

The invention belongs to the technology of a static load test of a movable surface in the field of aviation, and particularly relates to a fulcrum deformation applying method in a static load test of a movable surface.

Background

The deformation of the main box section of the airfoil surface greatly affects the stress of the movable surface, so that in an independent static load test of the movable surface, corresponding deformation needs to be applied to each fulcrum of the movable surface through the test supporting clamp according to the deformation of the main box section. However, the deformation of the main box section is generally large, and the deformation stroke requirement of the test support fixture is high when the traditional equipment and method apply large deformation to each fulcrum, so that the test implementation difficulty is increased.

Disclosure of Invention

The invention aims to provide a fulcrum deformation applying method in a static load test of an active surface, so as to reduce the requirement on test equipment and reduce the test difficulty.

In order to realize the task, the invention adopts the following technical scheme:

a fulcrum deformation applying method in an active surface static load test comprises the following steps:

establishing a fulcrum local coordinate system of a root fulcrum at the joint of the movable surface and the test equipment in the section of the movable surface;

under the fulcrum coordinate system, obtaining the deformation of the other root fulcrums except the root fulcrums at the two ends after being loaded through finite element analysis, and obtaining the position coordinates of the root fulcrums after being loaded and deformed;

determining relative deformation of the rest root supporting points in different coordinate axis directions of the supporting point local coordinate system based on the coordinate position;

in the static load test of the movable surface, after the movable surface is installed by using test equipment, deformation constraint is applied to each root fulcrum according to the determined relative deformation.

Further, the test equipment includes bearing wall, support anchor clamps and activity face and loading equipment, wherein:

each fulcrum of the movable surface is arranged on the bearing wall by using a supporting clamp in a mode of lug butt joint, wherein the fulcrum comprises a root fulcrum closest to the supporting clamp; the root fulcrums are numbered from 1 to N in sequence along the extension direction of the movable surface;

the supporting clamp comprises a slideway fixed on the bearing wall along the vertical direction and a clamping piece assembled in the slideway, the end part of the clamping piece is fixed with the movable surface, the clamping piece is provided with a telescopic mechanism, and the relative distance between the clamping piece and the bearing wall is adjusted through the telescopic mechanism; the vertical position of the movable surface is adjusted through the sliding of the clamping piece in the slideway.

Further, in the section of the active surface, establishing a fulcrum local coordinate system of a root fulcrum at the joint of the active surface and the test equipment, including:

establishing a fulcrum local coordinate system, wherein the origin O of the coordinate system is positioned at the root fulcrum of the movable surface connected with the supporting clamp, the Z axis is perpendicular to the lug plane at the fulcrum and points to the tip of the movable surface along the expansion direction of the movable surface, the X axis is perpendicular to the front beam plane in the movable surface and points to the direction of the bearing wall, the Y axis is determined by a right-hand coordinate system, and the subsequent fulcrum deformation calculation and application are carried out under the coordinate system

Further, the obtaining of the position coordinates of the root fulcrum after the load deformation includes:

let the coordinate of any root fulcrum i except the root fulcrums 1 and N at the two ends be (X)_i，Y_i，Z_i) And obtaining the deformation (delta X) of the root fulcrum i after loading through finite element analysis and calculation_i，ΔY_i，ΔZ_i) The position coordinate of the root fulcrum i of the movable surface after the deformation under load is (X)_0i，Y_0i，Z_i) Wherein X is_0i＝X_i+ΔX_i、Y_0i＝Y_i+ΔY_i；

Further, the determining, based on the coordinate position, the relative deformation of the rest root supporting points in the directions of different coordinate axes of the supporting point local coordinate system includes:

the root fulcrums 1 and N at the two ends of the deformed movable surface are taken as a straight line, and the equation of the straight line projected to the XZ plane is A₁Z+B₁X+C₁0, where coefficient A₁、B₁、C₁Can be determined by the coordinates (X) of the fulcrums 1 and N₀₁，Z₁) And (X)_0N，Z_N) Calculating to obtain; the relative deformation amount of the fulcrum i in the X directionIs composed of

Further, the relative deformation amount further includes:

the movable surface deforms and then the root parts of the two endsThe pivot points 1 and N are made into a straight line, and the equation of the straight line projected into the YZ plane is A₂Z+B₂Y+C₂0, where coefficient A₂、B₂、C₂From the coordinates (Y) of the fulcrums 1 and N₀₁，Z₁) And (Y)_0N，Z_N) Calculating to obtain; the relative deformation amount of the fulcrum i in the Y directionIs composed of

Further, the applying deformation constraints to the respective root fulcrums according to the determined relative deformation amounts includes:

after the movable surface is installed, 0 deformation constraint is applied to root fulcrums 1 and N in XYZ 3 directions, and root fulcrum i in the X directionDeformation, applied in the Y directionDeformation, 0 deformation is applied in the Z direction.

Further, the method is loaded in the form of a computer program in a memory of a computer, the computer comprising a processor and the memory, the computer program realizing the steps of the method when being executed by the processor.

Further, the method is loaded in a computer readable storage medium in the form of a computer program which, when executed by a processor, performs the steps of the method.

Compared with the prior art, the invention has the following technical characteristics:

according to the invention, according to the position coordinates of the deformed fulcrum points of the movable surface, the fulcrum points at two ends are selected as straight lines, the distances of the rest fulcrum points to the straight lines are calculated as the relative deformation of the fulcrum points, the relative deformation is greatly reduced compared with the original deformation, and in the static load test of the movable surface, smaller relative deformation is applied to the fulcrum points, so that the test accuracy is ensured, the requirements on test equipment are greatly reduced, and the test difficulty is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a movable surface static load test device;

FIG. 2 is a schematic view of a pivot point local coordinate system;

FIG. 3 is a diagram showing relative deformation in the X direction;

FIG. 4 is a Y-direction relative deflection diagram;

the reference numbers in the figures illustrate: 1 bearing wall, 2 slideways, 3 clamping pieces, 4 movable surfaces and 5 root fulcrums.

Detailed Description

In the traditional test equipment and method, when the deformation of the movable surface fulcrum needs to be simulated, the deformation of the main box section is generally large, and the requirement on the deformation stroke of the test supporting clamp is high when large deformation is applied to each fulcrum of the movable surface, so that the test implementation difficulty is increased.

Based on the above problems, the invention provides a fulcrum deformation applying method in an active surface static load test, which is shown in fig. 1, a schematic diagram of an active surface static load test device of the invention; the equipment comprises a bearing wall, a supporting clamp, a movable surface and loading equipment, wherein each fulcrum of the movable surface is installed on the bearing wall by using the supporting clamp in a mode of butt joint of lugs, the fulcrums comprise a root fulcrum and other fulcrums, and the root fulcrum is the fulcrum closest to the supporting clamp; the root fulcrums are numbered from 1 to N in sequence along the extension direction of the movable surface; the supporting clamp comprises a slideway fixed on the bearing wall along the vertical direction and a clamping piece assembled in the slideway, the end part of the clamping piece is fixed with the movable surface, the clamping piece is provided with a telescopic mechanism, and the relative distance between the clamping piece and the bearing wall is adjusted through the telescopic mechanism; the vertical position of the movable surface is adjusted through the sliding of the clamping piece in the slideway. In the actual structure of the airplane, the movable surface deforms along with the main box section; after the deformation, the connecting line of the deformed positions of the fulcrums forms a curve.

Based on the test equipment, the method comprises the following steps:

step 1, in a section of a movable surface, establishing a fulcrum local coordinate system for the movable surface, wherein an origin O of the coordinate system is positioned at a root fulcrum connected with a supporting clamp, a Z axis is perpendicular to a lug plate plane at the fulcrum and points to a tip of the movable surface along the expansion direction of the movable surface, an X axis is perpendicular to a front beam plane in the movable surface and points to the direction of a bearing wall, a Y axis is determined by a right-hand coordinate system, and subsequent fulcrum deformation calculation and application are performed under the coordinate system; during installation, the movable surface and the supporting clamp can be connected through a plurality of groups of supporting points which are distributed at different positions on the movable surface; and the root fulcrum is the fulcrum closest to the supporting clamp on the movable surface.

Step 2, when the movable surface is not loaded, the coordinate of any root fulcrum i except the root fulcrums 1 and N at the two ends is set as (X)_i，Y_i，Z_i) And obtaining the deformation (delta X) of the root fulcrum i after loading through finite element analysis and calculation_i，ΔY_i，ΔZ_i) Root pivot i is deformed in the out-of-plane direction of the tab by Δ Z_iIf the position coordinate of the root fulcrum i after the load deformation of the movable surface is very small and can be ignored, the position coordinate is (X)_0i，Y_0i，Z_i) Wherein X is_0i＝X_i+ΔX_i、Y_0i＝Y_i+ΔY_i。

And 3, calculating the relative deformation of the fulcrum i in the X direction.

The root fulcrums 1 and N at the two ends of the deformed movable surface are taken as a straight line, and the equation of the straight line projected to the XZ plane is A₁Z+B₁X+C₁0, where coefficient A₁、B₁、C₁Can be determined by the coordinates (X) of the fulcrums 1 and N₀₁，Z₁) And (X)_0N，Z_N) Calculating to obtain; the relative deformation amount of the fulcrum i in the X directionI.e. the distance from the fulcrum i to the straight line is

Step (ii) ofAnd 4, calculating the relative deformation amount of the fulcrum i in the Y direction. The pivots 1 and N of the root parts at the two ends of the deformed movable surface are taken as a straight line, and the equation of the straight line projected to the YZ plane is A₂Z+B₂Y+C₂0, where coefficient A₂、B₂、C₂From the coordinates (Y) of the fulcrums 1 and N₀₁，Z₁) And (Y)_0N，Z_N) And (4) calculating. The relative deformation amount of the fulcrum i in the Y directionI.e. the distance from the fulcrum i to the straight line is

Step 5, in the static load test of the active surface, after the active surface is installed, 0 deformation constraint is applied to the root fulcrums 1 and N in XYZ 3 directions, and the root fulcrum i is applied to the X directionDeformation, applied in the Y directionDeformation, 0 deformation is applied in the Z direction.

According to the position coordinates of the deformed fulcrums of the movable surface, the fulcrums at two ends are selected as straight lines, the distances of the rest fulcrums to the straight lines are determined as the relative deformation of the fulcrums, and the relative deformation is greatly reduced compared with the original deformation; in a static load test of the movable surface, a small relative deformation is applied to each fulcrum, so that a curve formed by position connecting lines after displacement change of each fulcrum is consistent with a curve formed by a traditional method, the test accuracy is ensured, the requirement on a test supporting device is greatly reduced, large-stroke adjustment of a supporting clamp is not needed, the test precision is ensured on one hand, and the implementation difficulty is reduced on the other hand.

By applying the method in a limit load test of a certain movable surface, the problem of practical engineering is effectively solved.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application, and are intended to be included within the scope of the present application.