CN106934148B - Simulation method for strengthening and lightening boat bag of stratospheric airship and preparation method - Google Patents
Simulation method for strengthening and lightening boat bag of stratospheric airship and preparation method Download PDFInfo
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Abstract
The invention provides a simulation method for strengthening and lightening a boat bag of a stratospheric airship, the stratospheric airship and a preparation method thereof, wherein the simulation method comprises the following steps: (1) determining the basic shape of a certain stratospheric airship to be researched, and modeling the basic shape; (2) carrying out simulation calculation to obtain the surface stress distribution of the airship capsule under the maximum overpressure condition; (3) dividing the surface stress of the airship capsule under the maximum overpressure condition to be larger than the maximum safe stress according to the relevant characteristics and safety factors of the airship capsule material to serve as reinforced areas; (4) the proper reinforcing rib material is selected to meet the requirement of light weight; a plurality of reinforcing fiber ribs along the circumferential direction and the longitudinal direction are arranged in a reinforcing area in a simulation mode to reinforce the boat bag; (5) after the boat bag is strengthened, the surface stress distribution condition of the boat bag is calculated through simulation again, and a proper low-surface-density material is selected to be applied to the boat bag according to the maximum stress.
Description
Technical Field
The invention relates to the technical field of stratospheric large airships, in particular to a stratospheric airship bag strengthening and light-weight simulation method, a stratospheric large airship and a preparation method thereof.
Background
The stratospheric airship is a lighter-than-air aerostat, is parked in the air by air buoyancy, provides energy power for the aerostat, is provided with a propulsion system, can realize vertical take-off and landing without depending on an airport or a runway, can hover over any geographical position, has the advantages of operation height exceeding the range of an air pipe, no influence of severe weather of a troposphere, continuous operation all day and all day, strong load capacity, high cost-efficiency ratio, wide detection range and the like, and has wide application prospect in national defense and civil use.
At present, stratospheric airships at home and abroad mainly adopt a soft type, which is different from the structural forms of hard type and semi-hard type airships, and the surface tension control caused by the pressure difference between the air inside and outside a bag body borne by a bag structure of the soft type airships in the stratosphere is completely realized. The stratosphere environment is harsh, the requirement on the strength of a boat bag skin material is high, and the traditional method for improving the structural strength of the airship mainly comprises the steps of directly reinforcing the performance of the skin material and changing the structural form of the airship. For example, multi-capsule sectional type airship, variant airship and the like, but new problems are continuously generated in the test process, and the problem of light weight of the airship is not fundamentally solved. For example, in the prior art, CN106240844A is a design method of stratospheric airship capsule strength, the invention accurately determines the airship capsule thickness according to a stratospheric airship capsule strength design formula, effectively reduces design errors in a stratospheric airship capsule strength design theory, and improves the reliability of capsule design, but the invention strengthens the whole area of the airship capsule surface, and is difficult to consider the light airship structure.
Research shows that the weight of a common airship capsule structure accounts for 40-60% of the buoyancy of the airship, the skin material is the basis of controlling the weight and the size of the stratospheric airship, and meanwhile, the skin material must be made of light materials with high strength, optimal helium permeation resistance and optimal weather resistance. It can be seen that the weight of the skin material severely affects the load-carrying performance of the airship. Therefore, starting from skin materials, the weight reduction of the airship is a fundamental measure for realizing the lightweight structure of the airship and has pertinence. Based on the method, a method for solving the problem that the structural lightweight of the stratospheric airship and the strengthening of the airship capsule are mutually restricted in the design process of the stratospheric airship is urgently needed, and the important index of the lightweight of the airship is considered while the integral stress of the airship capsule is reduced and the structure is strengthened integrally.
Disclosure of Invention
The invention aims to realize a simulation method for strengthening and lightening a stratospheric airship capsule by the following technical scheme, which comprises the following steps:
(1) determining the basic shape of a certain stratospheric airship to be researched, and modeling the basic shape;
(2) estimating an overpressure range possibly generated by the internal gas of the airship in the stagnation of the stratosphere, taking the maximum overpressure value as a loading condition, and performing simulation calculation on the maximum overpressure value by combining the external dimension and the overpressure condition of the airship to obtain the surface stress distribution of the airship capsule under the maximum overpressure condition;
(3) according to the relevant characteristics and safety factors of the airship capsule material, dividing a region of the airship capsule with the surface stress greater than the maximum safety stress under the maximum overpressure condition to serve as a reinforced strengthening region;
(4) the proper reinforcing rib material is selected to meet the requirement of light weight; a plurality of reinforcing fiber ribs along the circumferential direction and the longitudinal direction are arranged in a reinforcing area in a simulation mode to reinforce the boat bag;
(5) after the boat bag is strengthened, the surface stress distribution condition of the boat bag is calculated through simulation again, and a proper low-surface-density material is selected to be applied to the boat bag according to the maximum stress.
Further, in the step (1), the basic appearance of the stratospheric airship is a long ellipse rotation body structure, and modeling of an empennage and a nacelle which have little influence on the stress analysis of a airship capsule is omitted in the modeling process.
Further, in the step (2), the overpressure range refers to that the pressure difference between the internal gas and the external gas is generally controlled to be about 3% of the external gas pressure in order to ensure good aerodynamic characteristics and stable residence height of the stratospheric airship, and the maximum overpressure value 1500Pa is used as an overpressure condition to load the stratospheric airship to ensure good aerodynamic characteristics and stable residence height of the stratospheric airship because the pressure of the stratospheric airship can reach 0-1500Pa under the dual influence of overpressure and superheat of the internal gas.
Further, in the step (2), the surface stress of the airship capsule under the maximum overpressure condition is
Wherein σXSurface stress of the boat envelope surface in the X direction, σZSurface stress of the bladder surface in the Z-direction, P-differential gas pressure inside and outside the bladder, RZRadius of curvature of the skin infinitesimal in the X direction, RXRadius of curvature of the skin infinitesimal in the X direction, n ═ RX/RZ。
Further, in the step (3), the relevant characteristics and safety factors of the boat bag material comprise that the elastic modulus is 3Gpa-15GPa, the thickness is 0.1mm-0.5mm, and the tensile strength is 300N/cm-1200N/cm; and the safety factor is 2-6, and the maximum safe stress is the maximum stress multiplied by the safety factor of the boat bag material under the maximum overpressure value.
Further, in the step (3), the reinforced strengthening area is a middle section area which accounts for 50% -90% of the length of the airship shaft.
Further, in the step (4), the reinforcing fiber rib material is aramid fiber yarn (such as Kevlar fiber yarn), polyarylate fiber yarn (Vectran fiber yarn) or poly-p-phenylene benzobisoxazole fiber (for example PBO); the width range of the reinforced fiber rib is 50mm-250mm, and the thickness is 1mm-8 mm.
Further, in the step (4), the simulation arrangement of the reinforcing fiber ribs is carried out by simulating the following conditions: the boat bag and the reinforcing fiber ribs are welded into a whole under the heat seal action of the hot press, and a bonding agent is coated on the positions, in contact heat seal, of the reinforcing fiber ribs and the boat bag, wherein the circumferential reinforcing fiber ribs are distributed along the axial direction according to stress gradient, the longitudinal fiber ribs are uniformly distributed along the circumferential direction, namely, the axial intervals between the circumferential adjacent fiber ribs are unequal, the circumferential intervals depend on the stress gradient of the surface of the boat bag along the axial direction, included angles between the longitudinal adjacent fiber ribs are equal and are uniformly distributed within 360 degrees in the circumferential direction, the included angles depend on the number of the longitudinally distributed reinforcing fiber ribs, and the number of the circumferentially distributed reinforcing fiber ribs is larger than the number of the longitudinal fiber ribs; the circumferential reinforced fiber rib plays a limiting role on the longitudinal reinforced fiber rib at the outer side of the longitudinal reinforced fiber rib.
The invention also provides a preparation method of the stratosphere large airship, which is characterized by comprising the following steps of:
the first step, implementing the above simulation method to select a suitable low areal density material;
secondly, the low-surface-density material is used for preparing a stratospheric airship capsule to obtain a lightweight stratospheric airship capsule;
and step three, adopting the condition of the simulated arrangement of the reinforcing fiber ribs in the step (4) to truly arrange the reinforcing fiber ribs so as to reinforce the light stratospheric airship capsule obtained in the step two.
The invention also provides the stratosphere large airship prepared by the preparation method.
The low surface density material and the reinforcing rib fiber reinforcing method obtained by adopting the simulation algorithm have the advantages that under the condition of overpressure of the bag body, the elastic modulus difference between the bag material and the reinforcing fiber rib material is huge, even thousands of times, the surface of the bag is not smooth under the action of the reinforcing fiber rib, but a plurality of small 'bulges' are formed, so that the curvature radius in two directions is reduced, the stress of a reinforcing area is reduced, the purpose of improving the surface stress of the airship bag is achieved, and the light low surface density material can meet the stress use requirement.
The method for reinforcing the airship envelope is different from the traditional method for changing the appearance of the airship and reinforcing the thickness of the skin material, the airship with high strength and large effective load is designed on the basis of the stress distribution rule of the airship envelope, a plurality of reinforcing fiber ribs with high strength and low extensibility are only arranged in the annular and longitudinal simulation mode in the area with excessive surface stress of the airship envelope through a pre-simulation method, and the tension on the surface of the airship envelope is shared through the reinforcing fiber ribs under the overpressure condition of the airship envelope. Wherein, the reinforced fiber muscle passes through the heat seal welding mode with the utricule and realizes the integration, improves the bonding characteristic of boat bag and reinforced fiber muscle, has guaranteed the accurate location of reinforced fiber muscle on the boat bag and the better effect of sharing the skin stress, and the hoop reinforced fiber muscle is in vertical reinforced fiber muscle outside, has reduced the heat and welding technique degree of difficulty, has guaranteed the high efficiency of vertical reinforced fiber muscle. Therefore, after the airship capsule is strengthened, the skin material with lower surface density is applied to the airship capsule, the airship has a large surface area, and therefore the weight reduction effect of the airship is remarkable, the lightweight target of the airship is fundamentally realized, and the purposes of integral strengthening and structural lightweight of the airship are achieved.
In summary, the method has the advantages of being strong in pertinence, free of redundant operation, capable of performing simulation reinforcement on the local over-stress area of the surface of the airship capsule only through simulation in advance, capable of achieving both whole reinforcement and structural lightweight of the airship and high in cost-efficiency ratio. The invention has better practical value and wide application prospect in the field of designing and applying the future stratospheric airship, and in addition, the technical principle of the invention is also suitable for the structure strengthening and the light weight of aerostats such as stratospheric balloons, hot air balloons, low-altitude airships, balloons and the like.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of the effect of the stiffened airship according to the present invention.
FIG. 2 is a flow chart of the present invention.
FIG. 3 is a schematic view of the force applied to the skin at any position of the surface of the boat bag.
Fig. 4 is a schematic view of the distribution trend of the surface stress of the boat bag.
Fig. 5 is a schematic view of the reinforced fiber ribs on the surface of the boat bag and the relative positions of the reinforced fiber ribs.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to an embodiment of the present invention, a simulation method for strengthening and lightening a stratospheric airship envelope is provided, as shown in fig. 2, including the following steps:
(1) modeling the basic outline of the airship: the basic appearance of the stratospheric airship is a typical prolate ellipsoid rotation body structure, a certain rotation body profile curve is selected, the slenderness ratio range is noted to be 3-4, and the adjustment is specifically carried out according to design requirements; in the modeling process, the model can be modeled only aiming at the boat capsule, the model is a near-ellipsoid shell, the thickness of the spherical shell is the thickness of a skin material, and the model of the empennage and the pod which have little influence on the stress analysis of the boat capsule can be ignored;
(2) simulation: estimating the maximum overpressure possibly generated by the internal gas of the airship during the residence of the stratosphere, and taking the maximum overpressure value of 1500Pa as a loading conditionCarrying out simulation calculation on the airship according to the overall dimension and stress criterion of the airship to obtain the surface stress of a capsule of the airship under the maximum overpressure condition
Wherein σX-surface stress of the boat envelope in the X direction, σZ-surface stress of the bladder in the Z direction, pressure difference between the inside and outside of the P-bladder is 1500Pa, RZRadius of curvature in the Z direction, RXRadius of curvature in the X direction, n ═ RX/RZ；
(3) Determining a reinforced reinforcing area: according to the surface stress distribution of the airship capsule, the mechanical characteristics and the safety factor of skin materials in the ultimate working environment, determining that the surface stress of the airship capsule under the condition of maximum overpressure is greater than the maximum safety stress, and taking the airship capsule as a reinforced area, wherein the reinforced area is an area of a middle section which accounts for 50% -90% of the length of an airship shaft, namely the length of the airship shaft is 5% -25% of the length of the airship shaft from the head to the tail along the axial initial position of the reinforced area, and the maximum safety stress after the reinforcing effect of the reinforcing rib is the maximum stress corresponding to the airship capsule material of 3000Pa, as shown in figure 4, L: airship axial length, D: maximum cross-sectional width of airship, L1: the length of the boat bag reinforced area;
(4) selecting reinforced fiber rib materials and reinforcing the reinforced fiber rib materials in a simulation mode by simulating the following conditions: kevlar fiber yarns, Vectran fiber yarns or PBO reinforced synthetic fibers with high strength, high elastic modulus, low ductility, light weight, good heat seal property and compatibility with boat bag materials are selected as reinforced fiber rib materials, a plurality of annular reinforced fiber ribs and longitudinal reinforced fiber ribs are arranged in a reinforced area along the annular direction and the longitudinal direction in a simulation mode to reinforce the boat bag, the reinforced fiber ribs are distributed on the surface of the boat bag in an optimized mode, the annular reinforced fiber ribs are distributed along the axial direction according to stress gradient, the longitudinal reinforced fiber ribs are uniformly distributed along the circumferential direction, namely the axial intervals between the annular adjacent fiber ribs are different and depend on the axial stress gradient and the distribution number of the surface of the boat bag, the included angles between the longitudinal adjacent fiber ribs are equal and are uniformly distributed in 360 degrees along the circumferential direction, the size of the included angles depends on the number of the longitudinally distributed reinforced fiber ribs, the widths of the annular reinforced fiber ribs and the longitudinal reinforced fiber ribs are 50-200 mm, the thickness is 1 mm-5 mm; the bonding agent is coated between the contact surfaces of the reinforced fiber ribs and the boat bag, and the reinforced fiber belts are welded on the outer surface of the boat bag through a hot press, so that the fiber ribs and the boat bag are integrated, as shown in fig. 5 and fig. 1, wherein 1-annular reinforced fiber ribs, 2-longitudinal reinforced fiber ribs, 3-boat body, 4-tail wing and 5-longitudinal reinforced fiber ribs are uniformly distributed at equal angles in the circumferential direction, 6-annular reinforced fiber ribs are distributed in the axial direction according to stress gradient, 7-annular reinforced fiber ribs are on the outermost side, 8-longitudinal reinforced fiber ribs are on the inner side of annular reinforced fibers, and 9-boat body is on the innermost side;
(5) lightening: after the boat bag is reinforced, the maximum stress on the surface of the reinforced boat bag is calculated through simulation again, and according to the requirement that the strength of a skin material is not more than the maximum stress on the surface of the reinforced boat bag, a proper low-surface-density boat bag material is selected to be applied to the reinforced boat bag. Although this technique increases the weight of the reinforcing fiber ribs, the overall weight of the airship decreases considerably relative to the weight reduction of the airship envelope with a large surface area.
Specifically, the surface stress distribution of the airship envelope refers to the stress magnitude at any point on the surface of the airship and the position relation of the stress magnitude, and the airship surface stress distribution of the rotating body structure is related to the pressure difference magnitude and the curvature radius of the circumferential longitudinal skin. Therefore, the stress of the boat bag on any cross section perpendicular to the axis of the airship is equal in magnitude, the surface stress of the boat bag changes along the change of the axial distance, the simulation result is displayed in a stress cloud chart form, as shown in fig. 4, the darker the surface color of the boat bag represents the larger the stress, the same as the surface stress of the boat bag on any cross section perpendicular to the axis, the whole stress distribution trend is that the stress at the middle end is larger, the stress at the two ends is smaller, the stress changes along the axial distance and is different, and the stress magnitude calculation method at any point is as follows:
1) taking any skin infinitesimal on the surface of the boat bag for stress analysis, wherein the skin infinitesimal is small enough to carry out reasonable mathematical approximation, as shown in figure 3.
2) The force received by the covering in the Y direction is formed by the pressure difference P between the inside and the outside of the bag bodyForce, and tension FX、F-X、FZ、F-ZProjected in the Y direction, the magnitude of these forces can be approximated as follows:
△ P projection of pressure in Y directionX×θ×RZ×β (1)
FXProjection in Y direction:
F-Xprojection in Y direction:
FZprojection in Y direction:
F-Zprojection in Y direction:
the skin is stressed in a balanced manner in the Y direction, and the following conclusion can be reached:
from the force balance in the direction of X, Z, F can be knownXAnd F-X、FZAnd F-ZIs a force with equal magnitude and opposite direction, and the substitution (6) comprises the following steps:
P×RX×θ×RZ×β＝FX×θ+FZ×β (7)
suppose σXIs the tension coefficient in the X direction, σZIs the tension coefficient in the Z direction, i.e. the tension per unit length, then:
FX＝σX×RZ×β (8)
FZ＝σZ×RX×θ (9)
substituted into equation (7) is:
P×RX×θ×RZ×β＝σX×RZ×β×θ+σZ×RX×θ×β (10)
after finishing, obtaining:
3) it can be reasonably assumed that the mechanical properties of the skin material are isotropic, so the tension coefficient in a certain direction on the skin is proportional to the strain rate in the direction, after the gas with pressure P in the skin disappears suddenly, the diffusion direction of any point is the same as the normal direction of the point, the diffusion speed is proportional to the pressure at the point, since the pressures of the points are the same, the diffusion speed is the same, the curvature radius of any point on the back surface at a certain moment can be increased by the same amount △ r, the strain in the X direction is △ r × θ, and the strain rate is:
(△r×θ)/(RX×θ)＝△r/RX(12)
similarly, the strain rate in the Z direction is:
(△r×β)/(RZ×β)＝△r/RZ(13)
since strain rate is proportional to the tension coefficient, therefore:
(△r/RX)/(△r/RZ)＝σX/σZ(14)
namely, the method comprises the following steps:
σXRX＝σZRZ(15)
4) the following relationship is assumed for the radii of curvature in the two directions:
RX＝nRZ(16)
from equations (11), (15) it can be deduced:
wherein, X: x coordinate axis, Y: y coordinate axis, Z: a Z coordinate axis;
FX: the tension of the skin infinitesimal element along the positive direction of the X axis;
F-X: the tension of the skin infinitesimal element along the positive direction of the-X axis;
FZ: the tension of the skin infinitesimal element along the positive direction of the Z axis;
F-Z: the tension of the skin infinitesimal element along the positive direction of the-Z axis;
θ: the opening angle of the skin infinitesimal in the X direction;
β, opening angle of the skin infinitesimal in Z direction;
σX-surface stress of the boat envelope surface in the X-direction;
σZ-surface stress of the boat envelope surface in the Z-direction;
RX: the curvature radius of the skin infinitesimal in the X direction;
RZ: the curvature radius of the skin infinitesimal in the Z direction;
△ P, pressure difference of air inside and outside the capsule.
As can be seen from the above equations (17) and (18), as the ratio of the radii of curvature in the two directions increases, the coefficient of tension in one direction approaches 0 and the coefficient of tension in the other direction approaches the constant PRZ, which means that in order to reduce the tension in the skin, the radius of curvature of the skin should be reduced as a whole, and the airship is large in size to provide sufficient buoyancy, and the radius of curvature cannot be sufficiently small. Therefore, the reinforced area provided by the invention is an area with excessive boat bag stress, namely the area with excessive curvature radius is provided with annular and longitudinal reinforced fiber ribs in a simulated mode, under the condition of overpressure of the bag body, because the elastic modulus of the boat bag material and the reinforced fiber rib material is greatly different, even thousands of times, the surface of the boat bag is not smooth under the action of the reinforced fiber ribs, and a plurality of small bulges are formed, so that the curvature radius in two directions is reduced, the stress of the reinforced area is reduced, and the purpose of improving the surface stress of the boat bag is achieved.
In the simulation method considering both the strengthening and the light weight of the stratospheric airship capsule, the invention also provides a preparation method of the stratospheric large airship, which comprises the following steps:
the first step, implementing the above simulation method to select a suitable low areal density material;
secondly, the low-surface-density material is used for preparing a stratospheric airship capsule to obtain a lightweight stratospheric airship capsule;
and step three, adopting the condition of the simulated arrangement of the reinforcing fiber ribs in the step (4) to truly arrange the reinforcing fiber ribs so as to reinforce the light stratospheric airship capsule obtained in the step two.
The invention also provides the stratosphere large airship prepared by the preparation method.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for simulating the strengthening and light weight of a boat bag of an stratospheric airship is characterized by comprising the following steps:
(1) determining the basic shape of a certain stratospheric airship to be researched, and modeling the basic shape;
(2) estimating an overpressure range possibly generated by the internal gas of the airship in the stagnation of the stratosphere, taking the maximum overpressure value as a loading condition, and performing simulation calculation on the maximum overpressure value by combining the external dimension and the overpressure condition of the airship to obtain the surface stress distribution of the airship capsule under the maximum overpressure condition;
(3) determining a reinforced area according to relevant characteristics and safety factors of the boat bag material, wherein the surface stress of the boat bag of the reinforced area under the maximum overpressure condition is greater than the maximum safety stress;
(4) the proper reinforcing rib material is selected to meet the requirement of light weight; a plurality of reinforcing fiber ribs along the circumferential direction and the longitudinal direction are arranged in a reinforcing area in a simulation mode to reinforce the boat bag;
(5) after the boat bag is strengthened, the surface stress distribution condition of the boat bag is calculated through simulation again, and a proper low-surface-density material is selected to be applied to the boat bag according to the maximum stress.
2. The simulation method of claim 1, wherein in step (2), the maximum overpressure value is 1500 Pa.
3. The simulation method according to claim 1, wherein: in the step (2), the surface stress of the airship capsule under the maximum overpressure condition is
Wherein σXSurface stress of the boat envelope surface in the X direction, σZSurface stress of the bladder surface in the Z-direction, P-differential gas pressure inside and outside the bladder, RZRadius of curvature of the skin infinitesimal in the X direction, RXRadius of curvature of the skin infinitesimal in the X direction, n ═ RX/RZ。
4. The simulation method of claim 1, wherein in the step (3), the relevant properties and safety factors of the boat bag material include an elastic modulus of 3GPa-15GPa, a thickness of 0.1mm-0.5mm, and a tensile strength of 300N/cm-1200N/cm; and the safety factor is 2-6, and the maximum safe stress is the maximum stress multiplied by the safety factor of the boat bag material under the maximum overpressure value.
5. The simulation method according to claim 1, wherein in the step (3), the reinforced strengthening area is a middle section area which accounts for 50% -90% of the length of the airship shaft.
6. The simulation method according to claim 1, wherein in the step (4), the reinforcing fiber rib material is aramid fiber yarn, polyarylate fiber yarn or poly-p-phenylene benzobisoxazole fiber reinforced synthetic fiber; the width range of the reinforced fiber rib is 50mm-250mm, and the thickness is 1mm-8 mm.
7. The simulation method according to claim 1, wherein in the step (4), the simulation arrangement of the reinforcing fiber ribs is performed by simulating the following conditions: the boat bag and the reinforcing fiber ribs are welded into a whole under the heat seal action of the hot press, and a bonding agent is coated on the positions, in contact heat seal, of the reinforcing fiber ribs and the boat bag, wherein the circumferential reinforcing fiber ribs are distributed along the axial direction according to stress gradient, the longitudinal fiber ribs are uniformly distributed along the circumferential direction, namely, the axial intervals between the circumferential adjacent fiber ribs are unequal, the circumferential intervals depend on the stress gradient of the surface of the boat bag along the axial direction, included angles between the longitudinal adjacent fiber ribs are equal and are uniformly distributed within 360 degrees in the circumferential direction, the included angles depend on the number of the longitudinally distributed reinforcing fiber ribs, and the number of the circumferentially distributed reinforcing fiber ribs is larger than the number of the longitudinal fiber ribs; the circumferential reinforced fiber rib is arranged outside the longitudinal reinforced fiber rib.
8. The simulation method according to claim 1, wherein in the step (1), the basic appearance of the stratospheric airship is an oblong rotating body structure, and the modeling of the empennage and the nacelle which have little influence on the analysis of the hull stress is omitted in the modeling process.
9. A preparation method of a stratospheric large airship is characterized by comprising the following steps:
a first step of implementing the simulation method of any one of claims 1 to 8 to select a suitable low areal density material;
secondly, the low-surface-density material is used for preparing a stratospheric airship capsule to obtain a lightweight stratospheric airship capsule;
and thirdly, truly arranging the reinforcing fiber ribs by adopting the condition of simulating arrangement of the reinforcing fiber ribs in the step (4) in any one of claims 1 to 8 so as to reinforce the light stratospheric airship capsule obtained in the second step.
10. A stratospheric large airship, characterized in that it is produced by the production method of claim 9.
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