An on-board equipment weighing device and method of use thereof
By designing an airborne equipment weighing device that includes an item holder and a pressure sensor, the process of measuring the weight and center of gravity of airborne equipment is simplified, solving the problems of complex operation and large error in the existing technology, and achieving more accurate weight and center of gravity data acquisition.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGXI HONGDU AVIATION IND GRP
- Filing Date
- 2022-11-15
- Publication Date
- 2026-06-26
Smart Images
Figure CN115728007B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of aircraft airborne equipment testing technology, specifically, it relates to an airborne equipment weighing device and its usage method. Background Technology
[0002] Aircraft are equipped with numerous onboard devices, which affect the aircraft's center of gravity. Changes in the center of gravity directly impact the aircraft's handling, control, and stability. Therefore, obtaining the weight and center of gravity of various onboard devices is crucial during aircraft design. Common weighing devices, such as scales, spring scales, and electronic scales, require placement on a horizontal surface; otherwise, they only measure the component of gravity on the supporting surface, leading to significant errors. Existing methods for measuring the center of gravity are overly complex, requiring repositioning when adjusting the object's attitude, which introduces errors and consumes considerable time and manpower. To address the problems of complexity and error in existing weight and center of gravity measurement methods, this invention aims to provide an onboard equipment weighing device and its usage method that provides more accurate data on the weight and center of gravity of onboard equipment through simple operation. Summary of the Invention
[0003] In view of the above-mentioned prior art, the purpose of the present invention is to overcome the shortcomings of the prior art, adapt to the needs of reality, and thus provide an airborne equipment weighing device and its usage method that can obtain more accurate weight and center of gravity data of airborne equipment through simple operation.
[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an airborne equipment weighing device, comprising an item support, a ball bearing, a ball bearing support, a pressure sensor, a pressure sensor display, a pressure sensor bracket, and a support. The item support is supported on the ball bearing, the ball bearing is embedded in the ball bearing support, and one end of the ball bearing supports the item support while the other end presses against the pressure sensor. One end of the pressure sensor supports the ball bearing, and the other end is connected to the pressure sensor display via a wire. The pressure sensor is threaded onto the pressure sensor bracket, and the pressure sensor bracket is placed on the support.
[0005] Furthermore, the item support is composed of three mutually perpendicular isosceles right-angled triangle plates, and the three isosceles right-angled triangle plates are arranged with the right-angled sides overlapping in pairs, that is, the vertices of the three right angles overlap, and the overlapping point is the vertex of the item support. The three sides of the three intersecting faces of the item support represent the X-axis, Y-axis and Z-axis respectively, and each of the three sides is marked with a scale.
[0006] Furthermore, the ball bearing support is composed of three mutually perpendicular isosceles right-angled triangular plates, and the three isosceles right-angled triangular plates are arranged with their right-angled sides overlapping in pairs. Each isosceles right-angled triangular plate has an opening at its apex, the wall of which is spherical, and each opening contains a ball bearing.
[0007] Furthermore, the ball bearings are spherical, and there are multiple of them. The diameter of the ball bearings is slightly smaller than the diameter of the spherical surface of the opening wall on the ball bearing support. The ball bearings can rotate within the opening but will not fall off. One end of each ball bearing is in contact with the center of a pressure sensor, and the other end is in contact with the apex of the item support. The straight line connecting the contact point of the ball bearing with the item support and the center of the ball bearing intersects the scaled edge line (i.e., coordinate axis) on the inner side of the item support. The intersection point of the straight line connecting the contact point of the ball bearing at the three right angles of the item support and the center of the ball bearing is the inner vertex of the item support. The vertex of the item support is the origin of the coordinate system. The distance between two balls on the X-axis of the item support is equal to the distance between two balls on the Y-axis of the item support and the distance between two balls on the Z-axis of the item support. The distance between two balls on the same coordinate axis (i.e., the same edge of the three intersecting edges of the three inner surfaces of the item support) is set as L.
[0008] Furthermore, the pressure sensor bracket is composed of three mutually perpendicular isosceles right-angled triangular plates, and the three isosceles right-angled triangular plates are arranged with their right-angled sides overlapping in pairs. Each isosceles right-angled triangular plate has a threaded hole at its apex for mounting the pressure sensor. The pressure sensor bracket has a large plate thickness to provide sufficient support rigidity.
[0009] Furthermore, the ball bearing bracket, the item bracket, and the pressure sensor bracket have the same external structure but different sizes. The item bracket is located on the inner side of the ball bearing bracket, the ball bearing bracket is located on the inner side of the pressure sensor bracket, and the airborne equipment is placed on the inner side of the item bracket.
[0010] Furthermore, the support has a triangular prism shape, with the upper end of the support in contact with the bottom surface of the pressure sensor bracket, and the included angle between adjacent contact surfaces is approximately 145°. The lower end of the support is flat, allowing it to be placed on the ground or a table.
[0011] A method of using the airborne equipment weighing device as described above, the method comprising:
[0012] By powering on and zeroing the pressure sensor, the effect of the device's own gravity can be eliminated.
[0013] Place the airborne equipment and measure the coordinates of the reference point on the airborne equipment. By using the graduated edge line (i.e., coordinate axis) on the inside of the item holder, the coordinates of a certain point (i.e., the reference point) on the airborne equipment relative to the inner vertex (i.e., the origin of the coordinate system) of the item holder can be measured as: ΔX, ΔY, ΔZ.
[0014] The pressure sensor readings are taken. The support structure consists of three mutually perpendicular isosceles right-angled triangular plates, labeled X, Y, and Z. Each plate has a ball bearing at one corner. The ball bearing at the X-angle vertex of the X-plate is labeled X0, and the balls at the other two corners are labeled XY and XZ. The ball bearing at the Y-angle vertex of the Y-plate is labeled Y0, and the balls at the other two corners are labeled YX and YZ. The ball bearing at the Z-angle vertex of the Z-plate is labeled Z0, and the balls at the other two corners are labeled ZY and ZX. The pressure measured by the pressure sensor for each ball bearing is: P X0 P XY P XZ P Y0 P YX P YZ P Z0 P ZX and P ZY .
[0015] The weight and center of gravity of a computer-borne device are determined using the principle of force composition. The weight of the computer-borne device is calculated using the formula... The weight of the airborne equipment is obtained by using the principle of force balance to calculate the coordinates of the equipment's center of gravity, and then using the formula... and To obtain the coordinates of the airborne equipment's center of gravity, the following formula can be used to verify the calculation results: and At this point, the coordinates of the center of gravity are relative to the inner vertex of the item support (i.e., the origin of the coordinate system) and relative to the reference point of the airborne equipment: X0 = X - ΔX, Y0 = Y - ΔY, Z0 = Z - ΔZ.
[0016] Furthermore, the X plate is the YZ plane, the Y plate is the XZ plane, and the Z plate is the XY plane. The three balls on the X plate projecting onto the origin of the YZ plane are called X0 balls, the balls projecting onto the Y-axis are called XY balls, and the balls projecting onto the Z-axis are called XZ balls. Similarly, the three balls on the Y plate projecting onto the origin of the XZ plane are called Y0 balls, the balls projecting onto the X-axis are called YX balls, and the balls projecting onto the Z-axis are called YZ balls. Likewise, the three balls on the Z plate projecting onto the origin of the XY plane are called Z0 balls, the balls projecting onto the X-axis are called ZX balls, and the balls projecting onto the Y-axis are called ZY balls.
[0017] In this invention, the pressure sensor and pressure sensor display are general-purpose devices that can be purchased from the market according to actual needs.
[0018] The beneficial effects of this invention are as follows: This weighing device obtains the weight of the airborne equipment by measuring the component forces of the airborne equipment on the three plates of the support frame and calculating the resultant force. Since the device measures the three components of the airborne equipment's weight, this measurement is independent of the placement angle and will not produce errors due to the placement surface not being horizontal. When using this device to measure the center of gravity of the airborne equipment, it is only necessary to place the airborne equipment inside the device, measure the coordinates from a reference point on the airborne equipment to the inner vertex of the support frame, and then measure the pressures measured by the various pressure sensors. Substituting these values into the formula, the center of gravity of the airborne equipment can be measured. Compared with other existing methods for measuring the center of gravity, the method of this invention is simpler, and the entire process does not require a second movement of the object being measured, eliminating the need for moving the object and repositioning it, and avoiding measurement errors caused by repositioning. This invention is simple to operate, has low error, a clear principle, is easy to produce, highly practical, easy to promote and apply, and has significant value. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the assembly structure of the device of the present invention;
[0020] Figure 2 This is a schematic diagram of the structure of the article holder of the present invention;
[0021] Figure 3 This is a schematic diagram of the structure of the ball bearing support of the present invention;
[0022] Figure 4 This is a schematic diagram of the structure of the pressure sensor bracket of the present invention;
[0023] Figure 5 This is a schematic diagram of the structure of the support of the present invention;
[0024] Figure 6 This is a schematic diagram of the ball bearing mounting position of the present invention;
[0025] Figure 7 This is a schematic diagram of the ball bearing markings during pressure sensor measurement according to the present invention.
[0026] Among them, 1-item bracket, 2-ball bearing, 3-ball bearing bracket, 4-pressure sensor, 5-pressure sensor display, 6-pressure sensor bracket, 7-support, 8-straight line connecting the contact point and the center of the ball bearing, 9-inner side line of the item bracket, 10-inner vertex of the item bracket, 11-X plate, 12-X0 ball bearing, 13-XY ball bearing, 14-XZ ball bearing, 15-Y plate, 16-Y0 ball bearing, 17-YX ball bearing, 18-YZ ball bearing, 19-Z plate, 20-Z0 ball bearing, 21-ZY ball bearing, 22-ZX ball bearing, 23-opening, 24-threaded hole. Detailed Implementation
[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0028] like Figures 1 to 7 As shown, the present invention provides an airborne equipment weighing device, including an item support 1, a ball bearing 2, a ball bearing support 3, a pressure sensor 4, a pressure sensor display 5, a pressure sensor bracket 6, and a support 7. The item support 1 is supported on the ball bearing 2, the ball bearing 2 is embedded in the ball bearing support 3, and one end of the ball bearing 2 supports the item support 1, while the other end presses against the pressure sensor 4. One end of the pressure sensor 4 supports the ball bearing 2, and the other end is connected to the pressure sensor display 5 through a wire. The pressure sensor 4 is threadedly mounted on the pressure sensor bracket 6, and the pressure sensor bracket 6 is placed on the support 7.
[0029] Preferably, the item holder 1 is composed of three mutually perpendicular isosceles right-angled triangle plates, and the three isosceles right-angled triangle plates are arranged with the right-angled sides overlapping in pairs, that is, the vertices of the three right angles overlap, and the overlapping point is the vertex of the item holder. The three sides of the three intersecting faces of the inner side of the item holder 1 represent the X-axis, Y-axis and Z-axis respectively, and each of the three sides is marked with a scale.
[0030] Preferably, the ball bearing bracket 3 is composed of three mutually perpendicular isosceles right-angled triangular plates, and the three isosceles right-angled triangular plates are arranged with their right-angled sides overlapping in pairs. Each isosceles right-angled triangular plate has an opening 23 at its apex. The wall of the opening 23 is spherical, and each opening 23 contains a ball bearing 2.
[0031] Preferably, the ball bearing 2 is spherical, and there are multiple balls. The diameter of the ball bearing 2 is slightly smaller than the diameter of the spherical surface of the opening 23 on the ball bearing bracket 3. The ball bearing 2 can rotate within the opening 23 but will not fall off. One end of each ball bearing 2 is in contact with the center of a pressure sensor 4, and the other end is in contact with the top corner of the item bracket 1. The straight line 8 connecting the contact point of the ball bearing 2 with the center of the ball bearing intersects the scaled edge line (i.e., coordinate axis) on the inner side of the item bracket 1. The intersection point of the straight line connecting the contact point of the ball bearing at the three right angles of the item bracket 1 with the center of the ball bearing is the inner vertex 10 of the item bracket. The vertex of the item bracket is the origin of the coordinate system. The distance between two balls bearing 2 on the X-axis of the item bracket is equal to the distance between two balls bearing 2 on the Y-axis of the item bracket and the distance between two balls bearing 2 on the Z-axis of the item bracket. The distance between two balls bearing 2 on the same coordinate axis (i.e., the same edge of the three intersecting edges of the three inner surfaces of the item bracket) is set as L.
[0032] Preferably, the pressure sensor bracket 6 is composed of three mutually perpendicular isosceles right-angled triangular plates, and the three isosceles right-angled triangular plates are arranged with their right-angled sides overlapping in pairs. Each isosceles right-angled triangular plate has a threaded hole 24 at its apex for mounting the pressure sensor 4. The pressure sensor bracket 6 has a large plate thickness to provide sufficient support rigidity.
[0033] Preferably, the ball bearing bracket 3, the item bracket 1, and the pressure sensor bracket 6 have the same external structure but different sizes, and the item bracket 1 is located on the inner side of the ball bearing bracket 3, the ball bearing bracket 3 is located on the inner side of the pressure sensor bracket 6, and the airborne equipment is placed on the inner side of the item bracket 1.
[0034] Preferably, the support 7 has a triangular prism shape, the upper end of the support 7 contacts the bottom surface of the pressure sensor bracket 6, and the included angle between adjacent contact surfaces is about 145°, and the lower end of the support 7 is a flat surface, which can be placed on the ground or a table.
[0035] The present invention also provides a method of using the airborne equipment weighing device as described above, the method comprising:
[0036] Power on the device to zero pressure sensor 4 and eliminate the effect of its own weight.
[0037] Place the airborne equipment and measure the coordinates of the reference point on the airborne equipment. By using the scaled edge line (i.e., coordinate axis) on the inner side of the item holder 1, the coordinates of a certain point (i.e., the reference point) on the airborne equipment relative to the inner vertex 10 (i.e., the origin of the coordinates) of the item holder can be measured as: ΔX, ΔY, ΔZ.
[0038] The pressure sensor 4 reads the measured value. The item holder 1 consists of three mutually perpendicular isosceles right-angled triangular plates, labeled X plate 11, Y plate 15, and Z plate 19. Each isosceles right-angled triangular plate has a ball bearing 2 at one of its corner points. The ball bearing at the right-angle vertex of X plate 11 is labeled X0, and the balls at the other two corner points are labeled XY and XZ respectively; the ball bearing at the right-angle vertex of Y plate 15 is labeled Y0, and the balls at the other two corner points are labeled YX and YZ respectively; the ball bearing at the right-angle vertex of Z plate 19 is labeled Z0, and the balls at the other two corner points are labeled ZY and ZX respectively. The pressure measured by the pressure sensor 4 for each ball bearing 2 is: P X0 P XY P XZ P Y0 P YX P YZ P Z0 P ZX and P ZY .
[0039] The weight and center of gravity of a computer-borne device are determined using the principle of force composition. The weight of the computer-borne device is calculated using the formula... The weight of the airborne equipment is obtained by using the principle of force balance to calculate the coordinates of the equipment's center of gravity, and then using the formula... and To obtain the coordinates of the airborne equipment's center of gravity, the following formula can be used to verify the calculation results: and At this point, the coordinates of the center of gravity are relative to the inner vertex 10 of the item support (i.e., the origin of the coordinate system) and relative to the reference point of the airborne equipment: X0 = X - ΔX, Y0 = Y - ΔY, Z0 = Z - ΔZ.
[0040] Preferably, X plate 11 is a YZ plane, Y plate 15 is an XZ plane, and Z plate 19 is an XY plane. The three balls 2 on X plate 11 are projected onto the origin of the YZ plane as X0 ball 12, onto the Y axis as XY ball 13, and onto the Z axis as XZ ball 14. The three balls 2 on Y plate 15 are projected onto the origin of the XZ plane as Y0 ball 16, onto the X axis as YX ball 17, and onto the Z axis as YZ ball 18. The three balls 2 on Z plate 19 are projected onto the origin of the XY plane as Z0 ball 20, onto the X axis as ZX ball 22, and onto the Y axis as ZY ball 21.
[0041] In this invention, the airborne equipment is placed inside a support bracket 1, which consists of three mutually perpendicular isosceles right-angled triangular plates. Each triangular plate has a ball bearing 2 at one corner for support, and the other end of the ball bearing 2 presses against the center of a pressure sensor 4. The pressure sensor 4 and the pressure sensor display 5 are connected via wires. Both the pressure sensor 4 and the pressure sensor display 5 are general-purpose devices that can be selected as needed (such as the commonly available Spartacus SBT641 pressure sensor and SBT951 pressure sensor display). Since the ball bearing 2 only bears forces perpendicular to the contact surface, the supporting forces on the support bracket 1 are all perpendicular to the triangular plates. This allows the weight of the airborne equipment to be decomposed into three forces perpendicular to the triangular plates of the support bracket 1. Because the three triangular plates are mutually perpendicular, the three components of the weight G of the airborne equipment are also mutually perpendicular. The following relationship exists between the weight and the three component forces:
[0042] In this invention, the item support 1 is composed of three mutually perpendicular isosceles right-angled triangular plates, with each pair of right-angled triangular plates having overlapping right-angled sides, i.e., the vertices of the three right angles coincide, forming the vertices of the item support 1. The three plates are labeled X plate 11 (YZ plane), Y plate 15 (XZ plane), and Z plate 19 (XY plane), respectively. Using the inner surface of the item support 1 as the reference plane, the three intersecting edges of the three surfaces represent the X, Y, and Z axes, forming the coordinate system of the item support 1. The ball bearings 2 support the item support 1, and the straight line 8 connecting the contact point to the center of the ball bearing 2 intersects the inner edge line (coordinate axis) of the item support 1. The contact points of the three ball bearings 2 at the vertices of the item support 1 with the item support 1 are... The straight line 8 connecting the centers of the balls intersects at the inner vertex 10 of the support, i.e., the origin of the coordinate system. Thus, the three balls 2 of the X-plate 11 (YZ plane) are projected onto the origin of the YZ plane (X0 ball 12), the Y-axis (XY ball 13), and the Z-axis (XZ ball 14), respectively; the three balls 2 of the Y-plate 15 (XZ plane) are projected onto the origin of the XZ plane (Y0 ball 16), the X-axis (YX ball 17), and the Z-axis (YZ ball 18), respectively; and the three balls 2 of the Z-plate 19 (XY plane) are projected onto the origin of the XY plane (Z0 ball 20), the X-axis (ZX ball 22), and the Y-axis (ZY ball 21), respectively. The pressures measured by the pressure sensor 4 corresponding to the balls 2 are: P X0 P XY P XZ P Y0 P YX P YZ P Z0 P ZX P ZY .
[0043] In this invention, the principle of force composition is employed. The load P of plate X11 X The load is borne by the X0 ball 12, XY ball 13, and XZ ball 14, therefore P X =P X0 +P XY +P XZ The load P of Y plate 15 Y The load is borne by Y0 ball 16, YX ball 17 and YZ ball 18, therefore P Y =P Y0 +P YX +P YZ The load P of plate Z19 Z The load is borne by Z0 ball 20, ZX ball 22 and ZY ball 21, therefore P Z =P Z0 +P ZX +P ZY Substitute into the formula The weight G of the airborne equipment was calculated as follows:
[0044] In this invention, the principle of force balance is employed. The coordinates of the center of gravity of the airborne equipment are (X, Y, Z), and the component of the weight G of the airborne equipment on the X-plate 11 (YZ plane) is P. X The coordinates of the projection onto the YZ plane are (Y, Z). It is known that the three balls 2 of plate X11 (YZ plane) are projected onto the origin (X0 ball 12 (0,0)), the Y-axis (XY ball 13 (L, 0)), and the Z-axis (XZ ball 14 (0, L)). Find the torque balance within the YZ plane relative to the Z-axis. X ·Y=P XY ·L, derived Find the moment balance relative to the Y-axis in the YZ plane, P X ·Z=P XZ ·L, derived Following the above process, we can obtain: XZ plane (Y plate 15), XY plane (Z plate 19), Each centroid coordinate can be obtained using two sets of formulas. These two sets of formulas can be used to verify each other, which can prevent measurement errors caused by a malfunction in a certain part of the equipment.
[0045] Since the center of gravity of the airborne equipment measured by this device is in the coordinate system of the item support 1, it is necessary to measure the coordinates (ΔX, ΔY, ΔZ) of a certain point (i.e., the reference point) on the airborne equipment in the coordinate system inside the item support 1 through the scaled edge line (coordinate axis) on the inner side of the item support 1. By subtracting the coordinates (ΔX, ΔY, ΔZ) of the reference point of the airborne equipment from the coordinates of the center of gravity of the airborne equipment in the coordinate system of the item support 1, the center of gravity value of the airborne equipment relative to the reference point can be obtained, that is, X0 = X - ΔX, Y0 = Y - ΔY, Z0 = Z - ΔZ.
[0046] This invention calculates the weight of the airborne equipment by measuring the component forces acting on the three plates of a support structure and then calculating the resultant force. Since the device measures the three components of the equipment's weight, the measurement is independent of the device's placement angle, avoiding errors caused by an uneven placement surface. Compared to other existing methods for measuring the center of gravity, this invention is simpler and eliminates the need to move the object being measured, thus avoiding measurement errors caused by repositioning. This invention is simple to operate, has low error, a clear principle, is easy to manufacture, highly practical, and easily promoted for application, making it of significant value.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
[0048] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.
Claims
1. A weighing device for airborne equipment, characterized in that: The system includes an item support, a ball bearing, a ball bearing support, a pressure sensor, a pressure sensor display, a pressure sensor bracket, and a support. The item support rests on the ball bearing, which is embedded in the ball bearing bracket. One end of the ball bearing supports the item support, while the other end presses against the pressure sensor. One end of the pressure sensor supports the ball bearing, and the other end is connected to the pressure sensor display via a wire. The pressure sensor is threaded onto the pressure sensor bracket, which is then placed on the support. The item support consists of three mutually perpendicular isosceles right-angled triangles, with each pair of right-angled triangles having overlapping right-angled sides (i.e., the vertices of the three right angles coincide). These overlapping points are the vertices of the item support. The three intersecting sides of the three inner faces of the item support represent the X, Y, and Z axes, and each of these three sides is marked with graduations. The ball bearing support also consists of three mutually perpendicular isosceles right-angled triangles, with each pair of right-angled triangles having overlapping right-angled sides. Each isosceles right-angled triangular plate has an opening at its apex. The wall of this opening is spherical, and each opening contains a ball bearing. Multiple ball bearings are spherical, and their diameter is smaller than the diameter of the spherical wall of the opening on the ball bearing support. The ball bearings can rotate within the opening. One end of each ball bearing contacts the center of a pressure sensor, and the other end contacts the apex of the support. The line connecting the contact point of the ball bearing with the support and the center of the ball bearing intersects the inner edge of the support marked with graduations, i.e., the coordinate axis. The intersection of the lines connecting the contact points of the ball bearings at the three right angles of the support and the center of the ball bearings is the inner vertex of the support, which is the origin of the coordinate system. The distance between two ball bearings on the X-axis, the distance between two ball bearings on the Y-axis, and the distance between two ball bearings on the Z-axis are equal. The distance between two ball bearings on the same coordinate axis is denoted as L.
2. The airborne equipment weighing device according to claim 1, characterized in that: The pressure sensor bracket consists of three mutually perpendicular isosceles right-angled triangular plates, with the three isosceles right-angled triangular plates arranged with their right-angled sides overlapping in pairs. Each isosceles right-angled triangular plate has a threaded hole at its apex for mounting the pressure sensor.
3. The airborne equipment weighing device according to claim 1, characterized in that: The ball bearing bracket, the item bracket, and the pressure sensor bracket have the same external structure but different sizes. The item bracket is located on the inner side of the ball bearing bracket, the ball bearing bracket is located on the inner side of the pressure sensor bracket, and the airborne equipment is placed on the inner side of the item bracket.
4. The airborne equipment weighing device according to claim 1, characterized in that: The support is a triangular prism structure. The upper end of the support contacts the bottom surface of the pressure sensor bracket, and the included angle between adjacent contact surfaces is 145°. The lower end of the support is a flat surface, which can be placed on the ground or a table.
5. A method of using the airborne equipment weighing device as described in any one of claims 1 to 4, characterized in that: The usage method includes: Powering on the device zeroes the pressure sensor, eliminating the effect of its own weight. Place the item on the airborne equipment and measure the coordinates of a reference point on the airborne equipment. Then, measure a point on the airborne equipment through the graduated line on the inside of the item holder. The coordinates of the reference point relative to the inner vertex of the item holder are: , , ; The pressure sensor readings are read. The support structure consists of three mutually perpendicular isosceles right-angled triangular plates, labeled X, Y, and Z. Each plate has a ball bearing at one corner. The ball bearing at the X-angle vertex is labeled X0, and the balls at the other two corners are labeled XY and XZ. The ball bearing at the Y-angle vertex is labeled Y0, and the balls at the other two corners are labeled YX and YZ. The ball bearing at the Z-angle vertex is labeled Z0, and the balls at the other two corners are labeled ZY and ZX. The pressure measured by the pressure sensor for each ball bearing is as follows: , , , , , , , and ; The weight and center of gravity of a computer-borne device are determined using the principle of force composition. The weight of the computer-borne device is calculated using the formula... The weight of the airborne equipment is obtained by using the principle of force balance to calculate the coordinates of the equipment's center of gravity, and then using the formula... , and The coordinates of the airborne equipment's center of gravity were obtained. To verify the calculation results, the following formula was used to validate the airborne equipment's center of gravity coordinates: , and At this point, the coordinates of the center of gravity are relative to the inner vertex of the item support, and relative to the reference point of the airborne equipment: , , .
6. The method of using the airborne equipment weighing device according to claim 5, characterized in that: The X plate is a YZ plane, the Y plate is an XZ plane, and the Z plate is an XY plane. The three balls on the X plate are projected onto the origin of the YZ plane as X0 balls, onto the Y-axis as XY balls, and onto the Z-axis as XZ balls. Similarly, the three balls on the Y plate are projected onto the origin of the XZ plane as Y0 balls, onto the X-axis as YX balls, and onto the Z-axis as YZ balls. Likewise, the three balls on the Z plate are projected onto the origin of the XY plane as Z0 balls, onto the X-axis as ZX balls, and onto the Y-axis as ZY balls.