Impact-resistant paddle composite material structure

Abstract

The invention belongs to the technical field of paddle structures of cross-medium aircraft rotors, and particularly relates to an impact-resistant paddle composite material structure. Comprising a surface anti-impact coating, a skin, a spanwise bearing girder, frame girder surface carbon cloth, frame girders, transverse reinforcing ribs, spanwise reinforcing ribs and filling foam, the frame girder surface carbon cloth is pasted on the surfaces of the frame girders, the spanwise reinforcing ribs are of a semi-I-shaped structure, the transverse reinforcing ribs are made of carbon cloth and are of a shape like a Chinese character'ri ', and the filling foam is filled into the spanwise reinforcing ribs. The upper and lower surfaces of the transverse reinforcing rib are adhered to the skin, the left side of the transverse reinforcing rib is adhered to the arc-shaped surface of the frame girder, the right side of the transverse reinforcing rib is adhered to the left side of the spanwise reinforcing rib, and a transverse reinforcing rib is formed in the middle of the transverse reinforcing rib; spanwise bearing girders are arranged between the frame girders and the skin; foam is filled in the transverse reinforcing ribs and between the spanwise reinforcing ribs and the skin, and the surface impact-resistant coating covers the outer surface of the whole blade.

Description

Technical Field

[0001] The present invention belongs to the technical field of the blade structure of the rotor of a cross-media aircraft, and particularly relates to a blade composite material structure resistant to impact. Background Art

[0002] The cross-media aircraft is used in the working condition of air-water multiplexing, and has the advantages of vertical take-off and landing of an aerial vehicle and high concealment of an underwater submersible, etc., and has become a research hotspot. The rotor is a key component of the aircraft, providing lift and thrust for the aircraft. However, when the cross-media aircraft takes off and lands on the water surface, water splashes or water columns will be splashed. When the high-speed rotating blade, especially near the blade tip (linear velocity is large, ≥200 m / s), encounters the water column, great impact damage will be generated, and the internal structure of the blade needs to be strengthened and protected. The conventional structural strengthening is to bond an iron plate or a polyurethane protection belt at the leading edge, but the iron plate or the polyurethane protection belt is easy to debond in a water immersion environment and is not suitable for cross-domain aircraft. Moreover, there is no structure for strengthening along the chord length direction inside the conventional blade, and the structural strength in the chord length direction is weak. Summary of the Invention

[0003] Object of the Invention: To provide a blade composite material structure resistant to impact, and solve the problem that the rotor of the aircraft is damaged by water impact during the take-off and landing stages.

[0004] Technical Solution:

[0005] A blade composite material structure resistant to impact includes: a surface impact-resistant coating 1, a skin 2, a spanwise load-bearing girder 3, carbon cloth on the surface of the frame girder 4, a frame girder 5, a transverse strengthening rib 6, a spanwise strengthening rib 7, a filling foam 8.

[0006] Among them, the frame girder 5 includes two planes in the chord length direction and an arc surface along the blade thickness direction. The end parts of the two planes in the chord length direction are respectively bonded to the leading-edge skin; carbon cloth 4 on the surface of the frame girder is pasted on the frame girder 5. The spanwise strengthening rib 7 is of a semi-I-shaped structure, the material of the transverse strengthening rib 6 is carbon cloth, and the structure is in the shape of a Chinese character 'Ri'. The upper and lower surfaces of the transverse strengthening rib 6 are bonded to the skin, the left side of the transverse strengthening rib 6 is bonded to the arc surface of the frame girder 5, the right side of the transverse strengthening rib 6 is bonded to the left side of the spanwise strengthening rib 7, and a transverse strengthening rib is formed in the middle of the transverse strengthening rib 6; a spanwise load-bearing girder 3 is arranged between the frame girder 5 and the skin 2; the filling foam 8 is filled inside the transverse strengthening rib 6 and between the spanwise strengthening rib 7 and the skin 2, and the surface impact-resistant coating 1 covers the outer surface of the whole blade.

[0007] Furthermore, the material of the frame girder 5 is woven cloth or unidirectional cloth, and the main fiber direction of the material is along the chord length direction of the blade, increasing the transverse stiffness, and the frame girder is preformed.

[0008] Furthermore, the surface impact-resistant coating 1 is a polyurea coating or a polyurethane coating, the purpose of which is waterproof and impact-resistant, and the thickness is controlled within 0.5 mm to ensure waterproof and impact-resistant performance while reducing the impact on the aerodynamic shape of the blade.

[0009] Furthermore, the outermost layer of the skin 2 is high-strength HS6 woven glass cloth to enhance the impact damage tolerance capability.

[0010] Furthermore, the span-wise load-bearing beam 3 is made of HS6 high-strength glass fiber prepreg tape, which is laid along the span direction of the blade to improve the tensile stiffness of the blade.

[0011] Furthermore, the carbon cloth 4 on the surface of the frame beam is a 0 / 90 woven carbon cloth, which is attached to the frame beam 5 to increase the lateral rigidity.

[0012] Furthermore, the transverse reinforcing rib 6 is made of carbon cloth.

[0013] Furthermore, the filling foam 8 is a high-density polymethacrylate PMI foam, with a density requirement of ≥110Kg / m3 and a compression strength of ≥1.5MPA.

[0014] Beneficial effects:

[0015] The blades of the cross-media aircraft adopt the impact-resistant blade composite material structure of the present invention, which can improve the aircraft's blades' ability to resist water impact during the water entry and exit stages, avoid the blades being immersed in water for a long time, and at the same time meet the anti-corrosion and anti-fouling requirements, thereby improving the blades' safety margin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the internal structure of the blade;

[0017] Figure 2 for Figure 1 A partial enlarged view of

[0018] In the figure, impact-resistant coating 1, skin 2, span-wise load-bearing beam 3, carbon cloth on the surface of frame beam 4, frame beam 5, transverse reinforcement rib 6, span-wise reinforcement rib 7, and filling foam 8. DETAILED DESCRIPTION

[0019] The following is a detailed description with reference to the accompanying drawings.

[0020] like Figure 1 and Figure 2 A shock-resistant blade composite material structure of a cross-medium aircraft includes: a surface impact-resistant coating 1, a skin 2, a span-wise load-bearing beam 3, a carbon cloth on the surface of the frame beam 4, a frame beam 5, a transverse reinforcement rib 6, a span-wise reinforcement rib 7, and a filling foam 8.

[0021] The surface coating 1 covers the entire outer surface of the blade. The coating type is a polyurea coating or a polyurethane-based coating, aiming at waterproofing and impact resistance. The thickness is controlled within 0.5 mm to ensure waterproofing and impact resistance while reducing the impact on the aerodynamic shape of the blade;

[0022] The outermost layer of the skin 2 is a high-strength HS6 woven fiberglass cloth to enhance the impact damage tolerance ability;

[0023] The spanwise load-bearing girder 3 is made of HS6 high-strength fiberglass prepreg tape, and the direction is laid along the span of the blade to enhance the tensile stiffness of the blade;

[0024] The carbon cloth 4 on the surface of the frame girder is a 0 / 90-direction woven carbon cloth, which is pasted on the frame girder to increase the lateral stiffness

[0025] The frame girder 5 is made of a thermoplastic composite material, which can be a woven cloth or a unidirectional cloth. The main fiber direction of the material is along the chord length direction of the blade to increase the lateral stiffness. The frame girder is preformed;

[0026] The transverse stiffening rib 6 is made of carbon cloth, and the structure is in the shape of a "day" character. It is bonded to the skin up and down, and a transverse stiffening rib is formed in the middle;

[0027] The spanwise stiffening rib 7 structurally supports the transverse stiffening rib 6;

[0028] The filling foam 8 is a high-density polymethacrylimide (PMI) foam, with a density requirement of ≥110 Kg / m3 and a compressive strength of ≥1.5 MPA;

[0029] The shape of the stiffening rib 7 is in the shape of an "I", and the material is carbon cloth, which divides the filling foam into two parts to further enhance the impact resistance ability;

[0030] The frame girder 5 is preformed, and the spanwise load-bearing girder 3 is inserted into the frame of the frame girder 5 and integrally molded with the skin 2, the carbon cloth 4 on the surface of the frame girder, the transverse stiffening rib 6, the spanwise stiffening rib 7, and the filling foam 8. The surface impact-resistant coating 1 is sprayed on the surface of the molded blade.

[0031] The key points of the present invention are as follows: 1. The frame beam (5) is made of thermoplastic composite material, the fiber direction of the material is along the chord length direction of the blade, the lateral stiffness is increased, and the frame beam is prefabricated; 2. The transverse reinforcing rib (6) has a "sun" shape, which is bonded to the skin at the top and bottom, and a transverse reinforcing rib is formed in the middle; 3. The span-wise load-bearing beam (3) is inserted into the frame of the frame beam (5) to form a combination with strong structural strength in both directions; 4. The blade surface coating covers the outer surface of the blade, and the type is polyurea coating or polyurethane coating; 5. The outermost layer of the skin is high-strength woven glass cloth to improve impact resistance; 6. The beam material is HS6 high-strength glass fiber prepreg tape, and the direction is to be laid along the span length direction of the blade; 7. The filling foam (8) is high-density polymethyl methacrylate (PMI) foam, and the density requirement is ≥110Kg / m3 and the compression strength is ≥1.5MPA; 8. The frame beam (5) is prefabricated, and the remaining parts are molded in one step.

Claims

1. An impact-resistant blade composite material structure, characterized in that: Comprising: Surface impact-resistant coating (1), skin (2), spanwise load-bearing girder (3), carbon cloth on the surface of the frame girder (4), frame girder (5), transverse stiffener (6), spanwise stiffener (7), filling foam (8). Among them, the frame girder (5) includes two planar surfaces in the chord length direction and an arc surface in the blade thickness direction. The end parts of the two planar surfaces in the chord length direction are respectively bonded to the leading-edge skin; the carbon cloth on the surface of the frame girder (4) is pasted on the surface of the frame girder (5). The spanwise stiffener (7) is of a semi-I-shaped structure. The transverse stiffener (6) is made of carbon cloth and has a "day" shape structure. The upper and lower surfaces of the transverse stiffener (6) are bonded to the skin. The left side of the transverse stiffener (6) is bonded to the arc surface of the frame girder (5). The right side of the transverse stiffener (6) is bonded to the left side of the spanwise stiffener (7). A transverse stiffening rib is formed in the middle of the transverse stiffener (6); a spanwise load-bearing girder (3) is arranged between the frame girder (5) and the skin (2); the filling foam (8) is filled both inside the transverse stiffener (6) and between the spanwise stiffener (7) and the skin (2). The surface impact-resistant coating (1) covers the entire outer surface of the blade.

2. The impact-resistant blade composite material structure according to claim 1, characterized in that: The frame girder (5) is made of woven cloth or unidirectional cloth. The main fiber direction of the material is along the chord length direction of the blade to increase the transverse stiffness, and the frame girder is preformed.

3. The impact-resistant blade composite material structure according to claim 1, characterized in that: The surface impact-resistant coating (1) is a polyurea coating or a polyurethane-based coating, aiming at waterproofing and impact resistance. The thickness is controlled within 0.5 mm to ensure the waterproofing and impact resistance performance while reducing the influence on the aerodynamic shape of the blade.

4. The impact-resistant blade composite material structure according to claim 1, characterized in that: The outermost layer of the skin (2) is high-strength HS6 woven fiberglass cloth to improve the impact damage tolerance ability.

5. The impact-resistant blade composite material structure according to claim 1, characterized in that: The spanwise load-bearing girder (3) is made of HS6 high-strength glass fiber prepreg tape and is laid along the span direction of the blade to improve the tensile stiffness of the blade.

6. The impact-resistant blade composite material structure according to claim 1, characterized in that: The carbon cloth on the surface of the frame girder (4) is 0 / 90 direction woven carbon cloth, which is pasted on the frame girder (5) to increase the transverse stiffness.

7. The impact-resistant blade composite material structure according to claim 1, characterized in that: The transverse stiffener (6) is made of carbon cloth.

8. The impact-resistant blade composite material structure according to claim 1, characterized in that: The filling foam (8) is high-density polymethacrylimide PMI foam, with a density requirement of ≥110 Kg / m3 and a compressive strength of ≥1.5 MPA.

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