Aircraft height measuring method

Abstract

The invention belongs to the field of airplane strength tests, and particularly relates to an airplane height measuring method. The method comprises the following steps: constructing an equilateral triangle on a horizontal plane below a measuring point O on an aircraft wing, and ensuring that a projection point K of the measuring point O on the horizontal plane is in the equilateral triangle; respectively measuring the lengths from the three vertexes of the equilateral triangle to the O point; and calculating the length h from the O point to the K point according to the lengths from the three vertexes of the equilateral triangle to the O point. According to the aircraft height measurement method, the height of the aircraft attitude can be determined in the aircraft strength test, the measurement precision is improved, the aircraft height is displayed in real time, and the measurement efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of aircraft strength testing, and in particular to an aircraft altitude measurement method. Background Art

[0002] In the ground verification test of aircraft structure strength, the attitude of the aircraft, i.e. the height and pitch state of the aircraft on the horizontal ground, is the basic condition for the implementation of the strength test. Before the test begins, it is often necessary to correct the attitude of the aircraft first. During the attitude correction process, a symmetrical designated point at the wingtips of the two wings of the aircraft is used as a measurement point to measure the height from the ground and reflect whether the aircraft is in a horizontal state. Therefore, it is particularly important to measure the height of the aircraft wingtip measurement point from the ground.

[0003] At present, during the aircraft attitude adjustment process, the wing height is measured manually, that is, a suitable position is selected on the ground, and the distance from the wing measurement point to the ground is measured by a laser rangefinder. Since the position of the aircraft will change during the attitude adjustment process, the vertical projection position of the measurement point on the ground will also change. It is necessary to manually find the best position vertical to the ground for measurement, and the measurement accuracy needs to be manually controlled. Therefore, this method has problems such as inaccurate measurement and low measurement efficiency.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a method for measuring aircraft altitude to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A method for measuring aircraft altitude, comprising:

[0008] Construct an equilateral triangle on the horizontal plane below the measuring point O on the wing of the aircraft, and ensure that the projection point K of the measuring point O on the horizontal plane is inside the equilateral triangle;

[0009] Measure the lengths from the three vertices of the equilateral triangle to point O respectively;

[0010] Calculate the length h from point O to point K based on the lengths from the three vertices of the equilateral triangle to point O.

[0011] In at least one embodiment of the present application, the lengths l from point O to the three vertices of the equilateral triangle are measured by a wire sensor. a ,lb,l c .

[0012] In at least one embodiment of the present application, calculating the length h from point O to point K according to the lengths from the three vertices of the equilateral triangle to point O includes:

[0013] The three vertices of an equilateral triangle are A, B, and C, and the length of the side of the equilateral triangle is d;

[0014] Calculate the area of ​​each triangle according to Heron's formula:

[0015] The area S of equilateral triangle ABC is:

[0016]

[0017] The area S1 of triangle ACK is:

[0018]

[0019] The area S2 of triangle BCK is:

[0020]

[0021] The area S3 of triangle BAK is:

[0022]

[0023] According to the Pythagorean theorem for right triangles:

[0024]

[0025] Among them, l a is the length from point A to point O, a is the length from point A to point K, lb is the length from point B to point O, b is the length from point B to point K, l c is the length from point C to point O, and c is the length from point C to point K;

[0026] The area of ​​each triangle satisfies:

[0027] S=S1+S2+S3

[0028] Combining the above formulas, h can be calculated based on the measured values ​​of la, lb, and lc.

[0029] In at least one embodiment of the present application, the side length d of the equilateral triangle is set to 1 m.

[0030] In at least one embodiment of the present application, when the side length d of the equilateral triangle is 1 m:

[0031] The area S1 of triangle ACK is:

[0032]

[0033] The area S2 of triangle BCK is:

[0034]

[0035] The area S3 of triangle BAK is:

[0036]

[0037] The invention has at least the following beneficial technical effects:

[0038] The aircraft altitude measurement method of the present application can determine the altitude of the aircraft attitude in an aircraft strength test, improves measurement accuracy, displays the aircraft altitude in real time, and improves measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of an aircraft altitude measurement principle according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0042] The following is combined with Figure 1 This application is described in further detail.

[0043] The present application provides an aircraft altitude measurement method, comprising:

[0044] Construct an equilateral triangle on the horizontal plane below the measuring point O on the wing of the aircraft, and ensure that the projection point K of the measuring point O on the horizontal plane is inside the equilateral triangle;

[0045] Measure the lengths from the three vertices of the equilateral triangle to point O respectively;

[0046] Calculate the length h from point O to point K based on the lengths from the three vertices of the equilateral triangle to point O.

[0047] like Figure 1 As shown, an equilateral triangle is designed. Points A, B, and C are the three vertices of the equilateral triangle. The equilateral triangle is placed horizontally on the ground, and point O is the measuring point on the wing of the aircraft. The projection of point O in the plane of the equilateral triangle ABC is point K (point K is an imaginary point). When measuring, it is necessary to ensure that point K is always inside the equilateral triangle ABC. The lengths of AO, BO, and CO are measured by the three vertices of the equilateral triangle ABC using a wire sensor, recorded as la, lb, and lc. The length of the OK line segment at point O can be calculated based on the measured lengths of la, lb, and lc, recorded as h.

[0048] The process of calculating h based on the measured lengths of la, lb, and lc includes the following steps:

[0049] The three vertices of an equilateral triangle are A, B, and C, and the length of the side of the equilateral triangle is d;

[0050] Calculate the area of ​​each triangle according to Heron's formula:

[0051] The area S of equilateral triangle ABC is:

[0052]

[0053] The area S1 of triangle ACK is:

[0054]

[0055] The area S2 of triangle BCK is:

[0056]

[0057] The area S3 of triangle BAK is:

[0058]

[0059] According to the Pythagorean theorem for right triangles:

[0060]

[0061] Among them, la is the length from point A to point O, a is the length from point A to point K, lb is the length from point B to point O, b is the length from point B to point K, l c is the length from point C to point O, and c is the length from point C to point K;

[0062] The area of ​​each triangle satisfies:

[0063] S=S1+S2+S3

[0064] Combining the above formulas, according to l a ,lb,l c h is calculated from the measured value of

[0065] The height from the measuring point O to the projection point K is the aircraft height.

[0066] In one embodiment of the present application, the side length d of the equilateral triangle is set to 1 m. When the side length d of the equilateral triangle is 1 m:

[0067] The area S1 of triangle ACK is:

[0068]

[0069] The area S2 of triangle BCK is:

[0070]

[0071] The area S3 of triangle BAK is:

[0072]

[0073] The aircraft altitude measurement method of the present application can quickly calculate the altitude of the aircraft attitude through the above derivation process, has high measurement accuracy and efficiency, and reduces manual work intensity.

[0074] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for measuring aircraft altitude, characterized in that: include: Construct an equilateral triangle on the horizontal plane below the measuring point O on the wing of the aircraft, and ensure that the projection point K of the measuring point O on the horizontal plane is inside the equilateral triangle; Measure the lengths from the three vertices of the equilateral triangle to point O respectively; Calculate the length h from point O to point K based on the lengths from the three vertices of the equilateral triangle to point O.

2. The method for measuring aircraft altitude according to claim 1, characterized in that: The lengths la, lb, and lc from point O to the three vertices of the equilateral triangle are measured respectively by a wire sensor.

3. The method for measuring aircraft altitude according to claim 1, characterized in that: The length h from point O to point K is calculated based on the lengths from the three vertices of the equilateral triangle to point O, including: The three vertices of an equilateral triangle are A, B, and C, and the length of the side of the equilateral triangle is d; Calculate the area of ​​each triangle according to Heron's formula: The area S of equilateral triangle ABC is: The area S1 of triangle ACK is: The area S2 of triangle BCK is: The area S3 of triangle BAK is: According to the Pythagorean theorem for right triangles: Where la is the length from point A to point O, a is the length from point A to point K, lb is the length from point B to point O, b is the length from point B to point K, lc is the length from point C to point O, and c is the length from point C to point K; The area of ​​each triangle satisfies: S=S1+S2+S3 Combining the above formulas, h can be calculated based on the measured values ​​of la, lb, and lc.

4. The method for measuring aircraft altitude according to claim 3, characterized in that: Set the side length d of the equilateral triangle to 1m.

5. The method for measuring aircraft altitude according to claim 4, characterized in that: When the side length d of the equilateral triangle is 1m: The area S1 of triangle ACK is: The area S2 of triangle BCK is: The area S3 of triangle BAK is:

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