Design method of ejection seat waist rest with waist supporting function

Abstract

The invention discloses a design method of an ejection seat waist rest with a waist supporting function, which is characterized in that rib supports are designed on two side wings of the waist rest so as to support ribs during use; according to the waist shape of a pilot on the ejection seat and the specific structure of the ejection seat, several key size parameters influencing the supporting performance and comfort of the waist are selected, and the basic configuration of the waist rest is obtained. By means of the method, it is ensured that the ejection seat waist rest can provide enough supporting and comfort when used in the long endurance process, and the rib part can be supported.

Description

Technical Field

[0001] The invention belongs to the field of ejection seats, and in particular relates to a design method of an ejection seat waist support with a waist supporting function. Background Art

[0002] At present, there are three known methods for designing the lumbar support of ejection seats: the first is to add a polyurethane foam lumbar support for lumbar support on the basis of the mechanism; the second is to design a contoured backrest and add a layer of padding on it; the third is to add a small lumbar support that can be adjusted up and down on the basis of the second method.

[0003] The current ejection seat lumbar support is less comfortable when used, especially during long-distance flights, and fails to support the ribs. Summary of the invention

[0004] The purpose of the present invention is to provide a design method for an ejection seat lumbar support with a lumbar support function, which ensures that the ejection seat lumbar support can provide sufficient support and comfort when used during long flights and can support the ribs.

[0005] The technical solution adopted by the present invention is: A design method for an ejection seat lumbar support with a lumbar support function is disclosed. Rib supports are designed on both sides of the lumbar support to support the ribs when in use. Several key size parameters that affect lumbar support and comfort are selected according to the lumbar shape of the pilot on the ejection seat and the specific structure of the ejection seat to obtain a basic configuration of the lumbar support.

[0006] Assume that the Y axis is the back tangent line, the X axis is the perpendicular line of the back tangent line, and the intersection of the two axes is the intersection of the back tangent line and the seat surface; the key dimensional parameters selected are: 1) The height of the waist support point, An, is the height from the fourth and fifth lumbar vertebrae to the X-axis; 2) Thickness C of the waist support point n , is the distance from the fourth and fifth lumbar vertebrae to the Y axis; 3) Lumbar support width B n , whose size is determined by the physiological structure of the waist and is obtained by measuring the muscles on both sides of the spine; 4) The width D of the backrest, the size of which is determined by the specific seat structure; 5) Rib support height H n , the rib support is located on both sides of the waist; 6) Rib support expansion base angle α n , tanα=h / b, h=H n -C n , b = D-0.5B n ; 7) Rib support corner radius R.

[0007] The size of the human waist shape is obtained through three-dimensional scanning. When designing, the material, thickness and compression deformation of the clothing are taken into consideration.

[0008] The measured human rib shape and the compression performance of the supporting material are taken into consideration to determine the rib support fillet radius R, to ensure that the supporting arc surface of the rib support exceeds the curve of the human rib, and to ensure that there is a size difference d between the supporting arc surface of the rib support and the curved surface of the human rib.

[0009] The beneficial effects of the present invention are: This method ensures that the ejection seat lumbar support can provide adequate support and comfort when used during long flights and can support the ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of main parameters of the design configuration of the lumbar support of an ejection seat with lumbar support function in an embodiment of the present invention, wherein a) is a lateral cross section of a human body, and b) is a transverse cross section of a human body.

[0011] Figure 2 3D scanning of the human waist in accordance with an embodiment of the present invention is a schematic cross-sectional view.

[0012] Figure 3 Schematic diagram of the relationship between the rib support, the human body and the backrest in the embodiment of the present invention.

[0013] In the figure: 1 - height An of lumbar support point; 2 - thickness Cn of lumbar support point; 3 - width Bn of lumbar support; 4 - width D of backrest; 5 - basic angle αn of rib support for deployment; 6 - height Hn of rib support. DETAILED DESCRIPTION

[0014] In order to better understand the present invention, the present invention is further described below through the accompanying drawings and examples.

[0015] The present application provides a design method for an ejection seat lumbar support function, the principle of which is: rib supports are designed on both sides of the lumbar support to support the ribs when in use, and several key size parameters that affect lumbar support and comfort are selected according to the pilot's lumbar shape on the ejection seat and the specific structure of the ejection seat to obtain the basic configuration of the lumbar support.

[0016] Specifically: In the ejection seat proofing, the waist and back are mainly based on the basic element of the back tangent line of the seat. This application also follows this basic principle, such as Figure 1As shown in the figure, the Y axis is the back tangent line, the X axis is the vertical line of the back tangent line, and the intersection of the two axes is the intersection of the back tangent line and the seat surface.

[0017] The design of ejection seat lumbar support mainly needs to determine several key dimensional parameters, such as Figure 1 As shown, the present application provides the following key size parameters: 1) the height An of the waist support point, which is the height from the fourth and fifth lumbar vertebrae of the human body to the X-axis; 2) the thickness C of the waist support point n , is the distance from the fourth and fifth lumbar vertebrae to the Y axis. When designing, designers can subtract the corresponding structural dimensions according to the specific conditions of the seat to obtain the design dimensions of the lumbar support; 3) Lumbar support width B n , whose size is determined by the physiological structure of the waist, mainly considering the width of the muscles on both sides of the spine, which can be obtained by measuring the muscles on both sides of the spine. The advantage of this design is that it not only ensures effective support for the waist, but also has a better protection effect on the spine; 4) The width of the backrest D, whose size is determined by the specific seat structure; 5) The height of the rib support H n , the rib support is located on both sides of the waist support; 6) The basic angle of the rib support α n , tanα=h / b, h=H n -C n , b = D-0.5B n ; 7) Rib support corner radius R.

[0018] Among them, the size of the human waist shape is best sorted out by three-dimensional scanning data, and a certain sample size is required, which can be combined with relevant standards for reference, such as Figure 2 As shown, it is a schematic diagram of the cross-section of the three-dimensional scan of the human waist, which shows the basic shape of the cross-section of the human waist. It is the scanning data of the naked waist. When making specific designs, the material, thickness and compression deformation of the clothing also need to be considered.

[0019] Because the supporting material of the rib support will be compressed, in order to ensure that the rib can be effectively supported, when designing: determine the expansion base angle α of the rib support n On the basis of Figure 3 As shown, it is also necessary to consider the measured human rib shape and the compression performance of the supporting material to determine the rib support fillet radius R, to ensure that the supporting arc surface of the rib support exceeds the curve of the human ribs, and to ensure that there is a size difference d between the supporting arc surface of the rib support and the curved surface of the human ribs, so that when the human ribs contact the rib support, the supporting material will be compressed to obtain support.

[0020] The present application provides the definition of the basic dimensions of the basic configuration of the ejection seat lumbar support and the relationship between the seat structure dimensions. When designing specifically, it is only necessary to make appropriate adjustments based on the material (mainly supporting material) and structure of the lumbar support, and it is widely applicable.

[0021] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A design method for an ejection seat lumbar support with lumbar support function, characterized in that: Rib supports are designed on both sides of the lumbar support to support the ribs when in use. Several key dimensional parameters that affect lumbar support and comfort are selected according to the pilot's lumbar shape on the ejection seat and the specific structure of the ejection seat, to obtain the basic configuration of the lumbar support.

2. The design method of the ejection seat lumbar support with lumbar support function as claimed in claim 1, characterized in that: Assume that the Y axis is the back tangent line, the X axis is the perpendicular line of the back tangent line, and the intersection of the two axes is the intersection of the back tangent line and the seat surface; the key dimensional parameters selected are: 1) The height of the waist support point, An, is the height from the fourth and fifth lumbar vertebrae to the X-axis; 2) Thickness C of the waist support point n , is the distance from the fourth and fifth lumbar vertebrae to the Y axis; 3) Lumbar support width B n , whose size is determined by the physiological structure of the waist and is obtained by measuring the muscles on both sides of the spine; 4) The width D of the backrest, the size of which is determined by the specific seat structure; 5) Rib support height H n , the rib support is located on both sides of the waist; 6) Rib support expansion base angle α n , tanα=h / b, h=H n -C n , b = D-0.5B n ; 7) Rib support corner radius R.

3. The design method of the ejection seat lumbar support with lumbar support function as claimed in claim 2, characterized in that: The size of the human waist shape is obtained through three-dimensional scanning. When designing, the material, thickness and compression deformation of the clothing are taken into consideration.

4. The design method of the ejection seat lumbar support with lumbar support function as claimed in claim 2, characterized in that: The measured human rib shape and the compression performance of the supporting material are taken into consideration to determine the rib support fillet radius R, to ensure that the supporting arc surface of the rib support exceeds the curve of the human rib, and to ensure that there is a size difference d between the supporting arc surface of the rib support and the curved surface of the human rib.

Images