Machine body cross section shape of civil cargo machine
By designing a cross-sectional shape of a civilian cargo aircraft fuselage combining arcs and spline curves, the problems of low space utilization and poor economy in the existing technology are solved, more efficient cargo transportation and maintenance are achieved, and the aircraft is improved Comprehensive economic performance.
Patent Information
- Application Number
- CN202411491017.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-01-17
AI Technical Summary
The circular cross-section of the existing civilian freighter fuselage results in low space utilization and poor economy, which cannot meet the needs of the modern freight market.
A cross-sectional shape of a civil cargo fuselage fuselage is designed, and the shape of a combination of the first arc, the second arc and the spline curve is adopted to ensure high space utilization and good economicality, and to meet the needs of container transportation and personnel activities.
It improves the comprehensive economic performance of the aircraft, reduces the height of the aircraft floor, facilitates cargo transportation and maintenance, and improves space utilization and economy.
Smart Images
Figure CN119319909A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of aviation technology, and in particular relates to a cross-sectional shape of a fuselage of a civil cargo aircraft. Background Art
[0002] The cross-section of the fuselage of civil cargo aircraft mostly adopts a circular cross-section. Its advantages are that under a certain cross-sectional area, the appearance is smooth, the circumference is minimal, the aerodynamic resistance is small, and the manufacturing process is good. The disadvantage is that the aircraft floor is high from the ground, which is not convenient for cargo to enter and exit the cabin, and the space utilization rate in the cabin is low, and the economy is poor. With the rapid development of the international freight market, especially the transportation of large containers, the original circular cross-section of the fuselage can no longer fully meet the requirements of aircraft transportation and economy. Therefore, it is necessary to design a new fuselage cross-section shape to meet the development and use needs of civil cargo aircraft. Summary of the invention
[0003] Purpose of the invention: To provide a cross-sectional shape of the fuselage of a civil cargo aircraft, so as to overcome the shortcomings of the conventional circular cross-sectional shape of the fuselage of aircraft, such as low space utilization and poor economy.
[0004] Technical solution:
[0005] A cross-sectional shape of a fuselage of a civil cargo aircraft, wherein the cross-sectional shape of the fuselage of the civil cargo aircraft comprises: a first circular arc 1, two second circular arcs 2, and a spline curve 3, wherein two ends of the first circular arc 1 are respectively connected to one end of the two second circular arcs 2, and the other ends of the two second circular arcs 2 are respectively connected to two ends of the spline curve 3, the first circular arc 1 is bilaterally symmetrical, and the two second circular arcs 2 are bilaterally symmetrical; the spline curve 3 is bilaterally symmetrical, and any two line segments have a smooth transition to each other, and the first-order derivative is continuous.
[0006] Furthermore, the connection points of the two second arcs 2 and the spline curve 3 are located on the plane where the floor is located.
[0007] Furthermore, the dimension h from the top of the container to the ceiling of the aircraft meets the requirements of airworthiness standards.
[0008] Furthermore, on the plane where the floor is located, the dimension j from the outer shape of the single-side container to the outer shape line of the aircraft meets the requirements of airworthiness standards, and at the same time meets the requirements of container lateral mooring, lateral guide plate installation, and personnel activity space.
[0009] Furthermore, the maximum height dimension of the space below the aircraft floor is g, which is used for the system installation and maintenance of various cables, equipment, and pipelines of the aircraft.
[0010] Furthermore, the first arc 1 is located above the aircraft ceiling.
[0011] Furthermore, the spline curve 3 is located under the aircraft floor. The spline curve 3 has three key points, namely, the two intersection points of the floor line and the aircraft shape and the intersection point below the aircraft symmetry axis. It is tangent to the left and right second arcs 2 and smoothly transitions. The first-order derivative is continuous.
[0012] Furthermore, the two second arcs 2 are located above the aircraft floor and below the ceiling.
[0013] Beneficial effects:
[0014] The present invention overcomes the shortcomings of the commonly used circular cross-section shape of the fuselage of existing aircraft, such as low space utilization and poor economy, and provides a fuselage cross-section shape that meets the use requirements of modern civil cargo aircraft, etc., improves the comprehensive economic performance of the aircraft, and meets the use requirements of civil transportation.
[0015] The container cargo hold space is straight-through, which is convenient for cargo transportation, loading and unloading. The height of the aircraft floor from the ground is reduced, which significantly improves the performance of aircraft cargo transportation. Each part of the aircraft cross section pursues reasonable and minimum effective space, improves the utilization rate of the cabin space, reduces the weight of the aircraft, and improves the economy of the aircraft. It has good processability and maintainability. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the cross-sectional shape of a civil cargo aircraft fuselage and the cabin layout;
[0017] Figure 2 The figure is a schematic diagram of the cross-section of the fuselage of a civil cargo aircraft.
[0018] Among them: 1. An arc (above the aircraft ceiling, symmetrical on the left and right); 2. An arc (above the aircraft floor, below the ceiling, symmetrical on the left and right); 3. A spline curve (below the aircraft floor, symmetrical on the left and right). DETAILED DESCRIPTION
[0019] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation 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 implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.
[0020] In the description of the present invention, it is necessary to understand that the terms "center", "axial", "vertical", "up", "down", "upper end", "bottom end", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.
[0021] The invention relates to a cross-sectional shape of a fuselage of a civil cargo aircraft, in particular to a cross-sectional shape of a fuselage of a civil cargo aircraft for standard container cargo transportation, which can be widely used in civil cargo aircraft.
[0022] A cross-sectional shape of a fuselage of a civil cargo aircraft, wherein the cross-sectional shape of the fuselage of the civil cargo aircraft comprises: a first circular arc 1, two second circular arcs 2, and a spline curve 3, wherein two ends of the first circular arc 1 are respectively connected to one end of the two second circular arcs 2, and the other ends of the two second circular arcs 2 are respectively connected to two ends of the spline curve 3, the first circular arc 1 is bilaterally symmetrical, and the two second circular arcs 2 are bilaterally symmetrical; the spline curve 3 is bilaterally symmetrical, and any two line segments have a smooth transition to each other, and the first-order derivative is continuous.
[0023] The connection points of the two second arcs 2 and the spline curve 3 are located on the plane where the floor is located.
[0024] The dimension h from the top of the container to the aircraft ceiling meets the airworthiness standards.
[0025] On the plane where the floor is located, the dimension j from the single-side container shape to the aircraft shape line meets the airworthiness standard requirements, and at the same time meets the requirements of container lateral mooring, lateral guide plate installation, and personnel activity space.
[0026] The maximum height of the space below the aircraft floor is g, which is used for the system installation and maintenance of various cables, equipment, and pipelines of the aircraft.
[0027] The first arc 1 is located above the aircraft ceiling.
[0028] The spline curve 3 is located under the aircraft floor. The spline curve 3 has three key points, namely, the intersection points of the floor line and the aircraft shape and the intersection point below the aircraft symmetry axis. It is tangent to the left and right second arcs 2 and smoothly transitions. The first-order derivative is continuous.
[0029] The two second arcs 2 are located above the aircraft floor and below the ceiling.
[0030] Example:
[0031] like Figure 1 , Figure 2As shown, a cross-sectional shape of a civil cargo aircraft fuselage, the cross-section mainly includes: a first arc 1 (above the aircraft ceiling, symmetrical on both sides); two second arcs 2 (above the aircraft floor, below the ceiling, symmetrical on both sides); a spline curve 3 (below the aircraft floor, symmetrical on both sides). This civil cargo aircraft is aimed at the international standard container freight market, takes the maximum specification size of the standard container (2438mm wide × 2896mm high) as the loading target, pursues a reasonable and minimum envelope, and designs the aircraft cross-sectional shape. The fuselage cross-sectional shape adopts a shape similar to an "olive shape", which is characterized in that the cross-sectional shape of the aircraft "olive shape" is divided into three parts, the part above the aircraft ceiling is a small half of the first arc 1, which is symmetrical to the aircraft symmetry axis, with a radius of Ra; the part above the aircraft floor to below the ceiling is a section of arc 2, which is symmetrical to the aircraft symmetry axis, with a radius of Rb; the part below the floor is a spline curve 3, which is symmetrical to the aircraft symmetry axis; the two line segments are tangent and smoothly transitioned, and the first-order derivative is continuous, forming a fuselage cross-sectional shape similar to an "olive shape".
[0032] The space above the aircraft ceiling is used for the installation and maintenance of aircraft cables, equipment, various pipelines and flight control systems, with a maximum height of c. The space above the aircraft floor and below the ceiling is the container cargo hold, with a maximum height of f, a floor width of d, a maximum fuselage width of e, a container top to the aircraft ceiling of h, and a single-sided container shape to the aircraft outline of j. The dimension h from the top of the container to the aircraft ceiling meets the requirements of airworthiness standards. The dimension j from the single-sided container shape to the aircraft outline meets the requirements of airworthiness standards, and at the same time meets the requirements of container lateral mooring, lateral guide plate installation, and personnel activity space. The space below the aircraft floor is used for the installation and maintenance of various aircraft cables, equipment, pipelines and other systems, with a maximum height of g.
[0033] 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 cross-sectional shape of a civil cargo aircraft fuselage, characterized in that: The cross section of the fuselage of a civil cargo aircraft comprises: a first circular arc (1), two second circular arcs (2), and a spline curve (3), wherein two ends of the first circular arc (1) are respectively connected to one end of the two second circular arcs (2), and the other ends of the two second circular arcs (2) are respectively connected to two ends of the spline curve (3), the first circular arc (1) is bilaterally symmetrical, and the two second circular arcs (2) are bilaterally symmetrical; the spline curve (3) is bilaterally symmetrical, and the line segments are tangent and smoothly transitioned, and the first-order derivative is continuous.
2. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: The connection points of the two second arcs (2) and the spline curve (3) are located on the plane where the floor is located.
3. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: The dimension h from the top of the container to the aircraft ceiling meets the airworthiness standards.
4. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: On the plane where the floor is located, the dimension j from the single-side container shape to the aircraft shape line meets the airworthiness standard requirements, and at the same time meets the requirements of container lateral mooring, lateral guide plate installation, and personnel activity space.
5. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: The maximum height of the space below the aircraft floor is g, which is used for the system installation and maintenance of various cables, equipment, and pipelines of the aircraft.
6. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: The first arc (1) is located above the aircraft ceiling.
7. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: The spline curve (3) is located under the aircraft floor. The spline curve (3) has three key points, namely, the intersection points of the floor line and the aircraft shape and the intersection point below the aircraft symmetry axis. It is tangent to the left and right second arcs (2) and smoothly transitions. The first-order derivative is continuous.
8. The cross-sectional shape of the fuselage of a civil cargo aircraft according to claim 1, characterized in that: The two second arcs (2) are located above the floor of the aircraft and below the ceiling.