Rotary damping system in high-altitude balloon flight
阅读说明：本技术 一种高空气球飞行中的旋转阻尼系统 (Rotary damping system in high-altitude balloon flight ) 是由 张泰华 王梓皓 付强 张冬辉 王谦 于 2020-06-01 设计创作，主要内容包括：本发明涉及一种高空气球飞行中的旋转阻尼系统,包括与气球约束结构相连接的张拉膜结构,所述张拉膜结构包括阻尼膜和包围所述阻尼膜边缘的阻尼膜横拉绳、阻尼膜竖拉绳以及阻尼膜斜拉绳,其中,阻尼膜横拉绳一端与阻尼膜斜拉绳一端相连接,形成第一连接点；阻尼膜横拉绳另一端与阻尼膜竖拉绳一端相连接,形成第二连接点；阻尼膜斜拉绳另一端与所述阻尼膜竖拉绳另一端相连接,形成第三连接点；所述第一连接点、第二连接点和第三连接点分别连接至所述气球约束结构。本发明为高空气球设计一种新的旋转阻尼结构,采用自然耗散做功的方式,将气球旋转过程中的动能逐渐耗散掉,减小或消除高空气球在飞行过程的旋转,使高空气球飞行方向趋于稳定。(The invention relates to a rotary damping system in high-altitude balloon flight, which comprises a tension membrane structure connected with a balloon constraint structure, wherein the tension membrane structure comprises a damping membrane, a damping membrane transverse pull rope, a damping membrane vertical pull rope and a damping membrane diagonal pull rope, wherein the damping membrane transverse pull rope, the damping membrane vertical pull rope and the damping membrane diagonal pull rope surround the edge of the damping membrane; the other end of the damping film transverse pull rope is connected with one end of the damping film vertical pull rope to form a second connection point; the other end of the damping film diagonal rope is connected with the other end of the damping film vertical pull rope to form a third connection point; the first, second and third attachment points are each attached to the balloon-restraining structure. The invention designs a novel rotary damping structure for the high-altitude balloon, adopts a natural dissipation acting mode to gradually dissipate kinetic energy in the rotating process of the balloon, reduces or eliminates the rotation of the high-altitude balloon in the flying process, and leads the flying direction of the high-altitude balloon to tend to be stable.)
1. A rotary damping system in high-altitude balloon flight is characterized by comprising a tension membrane structure connected with a balloon constraint structure, wherein the tension membrane structure comprises a damping membrane, a damping membrane transverse pull rope, a damping membrane vertical pull rope and a damping membrane diagonal pull rope, the damping membrane transverse pull rope, the damping membrane vertical pull rope and the damping membrane diagonal pull rope surround the edges of the damping membrane,
one end of the damping film transverse pull rope is connected with one end of the damping film diagonal pull rope to form a first connecting point;
the other end of the damping film transverse pull rope is connected with one end of the damping film vertical pull rope to form a second connection point;
the other end of the damping film stay rope is connected with the other end of the damping film vertical stay rope to form a third connection point;
the first, second and third attachment points are each attached to the balloon-restraining structure.
2. The high-altitude-balloon in-flight rotational damping system of claim 1,
stretch-draw membrane structure still includes first cover bag, second cover bag and third cover bag, first cover bag cover is established on the horizontal stay cord of damping membrane, second cover bag cover is established on the oblique stay cord of damping membrane, third cover bag cover is established on the perpendicular stay cord of damping membrane.
3. The high-altitude-balloon in-flight rotational damping system of claim 1,
the balloon constraining structure comprises a balloon stay cord, a reinforcing belt, a balloon bottom bundling part, a balloon vertical stay cord and a rigid connecting part, wherein,
the bottom-of-sphere bundling part is positioned at the bottom of the balloon;
the reinforcing belt penetrates through the whole balloon and is connected with the ball bottom bundling part;
the balloon diagonal draw ropes are uniformly distributed around the balloon, one end of each balloon diagonal draw rope is connected with the corresponding reinforcing belt, and the other end of each balloon diagonal draw rope is connected with the first end of the corresponding rigid connecting part;
one end of the balloon vertical pull rope is connected with the sphere bottom bundling part, and the other end of the balloon vertical pull rope is connected with the first end of the rigid connecting part;
the first connection point is connected to the reinforcing strip,
the second connection point is connected to the sole bunching section,
the third connection point is connected to the first end of the rigid connection portion.
4. The high-altitude-balloon in-flight rotational damping system of claim 3,
the rigid connection portion is rope ladder structure, rope ladder structure include first rope ladder erect rope, second rope ladder erect rope and a plurality of both ends respectively with first rope ladder erects rope, the second rope ladder erects the rope ladder horizontal pole that the rope is connected, wherein, first rope ladder erects the rope and the second rope ladder erects the rope and weaves the rope for reverse twist with fingers, rope ladder horizontal pole is the rigid member, damping film draws the rope to one side with first rope ladder erects the rope and is connected, damping film erect the stay cord with second rope ladder erects the rope and is connected.
5. The high-altitude-balloon in-flight rotational damping system of claim 4,
the rope ladder cross rod is a wooden stick or a carbon fiber pipe.
6. The high-altitude-balloon in-flight rotational damping system of claim 3,
the rigid connecting part is of a rope cage structure, and the damping film stay ropes and the damping film vertical stay ropes are respectively connected to two ends of a diagonal line of the cross section of the rope cage structure.
7. The high-altitude-balloon in-flight rotational damping system of claim 3,
the parachute is connected with the second end of the rigid connecting portion, and the lower end of the parachute is connected with the pod.
8. The high-altitude-balloon in-flight rotational damping system of claim 3,
in the balloon releasing stage, the tension membrane structure is in an undeployed state, and the balloon stay cable and the damping membrane stay cable jointly restrain the balloon which is not shaped after inflation; in the process of lifting the balloon off, the damping film is gradually unfolded under the tension action of the damping film transverse pull rope, the damping film vertical pull rope and the damping film diagonal pull rope around the damping film, and the rotation of the rotating balloon is reduced or eliminated by the tensioning film structure.
9. The high-altitude-balloon in-flight rotational damping system of claim 8,
during the flat flying process of the balloon, the damping film is in a tightening state, the rotating angular speed of the balloon is omega-d theta, and the pneumatic resistance F received by the damping film at any angle thetadComprises the following steps:
Fd＝0.5ρv2S＝0.5ρ(Δv+rdθ)2S (1)
wherein rho is the air density, r is the distance between the geometric center of the damping film and the rotating shaft, S is the area of the damping film, Deltav is the difference between the horizontal flying speed of the balloon and the wind speed at the height,
the mechanical balance equation of the whole system is as follows:
where J is the system moment of inertia.
10. The high-altitude-balloon in-flight rotation damping system of any one of claims 1 to 9,
the damping film is made of light-weight, high-strength and airtight fabric materials, and comprises nylon cloth and plastic cloth.
Technical Field
The invention relates to the technical field of aerostats, in particular to a rotary damping system in high-altitude balloon flight.
Background
The high-altitude balloon is also called high-altitude scientific balloon and is an unpowered aerostat flying in the stratosphere. The working principle of the high-altitude balloon to lift off and fly is constructed according to the Archimedes buoyancy law and the Newton's second law, and the balloon is filled with buoyancy gas with the density smaller than that of air, such as hydrogen or helium, on the ground, so that the balloon can rise at a certain speed. The ascent speed of the balloon is controlled by the free buoyancy, which is the difference between the total buoyancy and the system weight. When the balloon is close to the ascending limit, the whole balloon is fully inflated, and when the balloon continues to ascend, the part of gas (also called redundant gas) used for generating free buoyancy in the zero-pressure type high-air balloon body is exhausted outwards through the exhaust pipe at the lower part of the balloon so as to keep the internal pressure and the external pressure of the balloon equal. The overpressure type high-altitude balloon keeps high stability by using overpressure in the balloon. The volume of the balloon is determined according to different requirements of load capacity and lifting limit, and the larger the load capacity is, the higher the lifting limit is, and the larger the required volume is. The high altitude balloon volume is usually from several thousand cubic meters to several tens of thousands cubic meters, even more than million cubic meters; the loading capacity is from dozens of kilograms to hundreds of kilograms, even more than one ton; the rising limit is 20-45 km, and exceeds 50 km.
After the high-altitude balloon reaches the flying altitude, the high-altitude balloon starts flying with the wind, and the flying direction depends on the wind direction of the altitude. The high-altitude balloon can axially rotate in the flying process, but the direction of a lot of loads needs to be kept stable, and in order to stabilize the direction of the nacelle or the loads, the attitude stabilization nacelle is generally designed, and the directional stability of the nacelle or the loads is ensured mainly by using the combined control of a flywheel and a reverse-twist motor. However, the nacelle with the attitude control increases the weight of the nacelle due to the inevitable mass of the flywheel, energy is continuously consumed in the control process, and the continuous rotation can cause overload operation of the reverse-twist motor and a control system thereof and even non-convergence of the system. This passive control also introduces difficulties and uncertainties into attitude control of the high-altitude balloon pod. In addition, the attitude control of the pod is realized by using a reverse-twist motor to control the pod or the local load, and the core of the control is to enable the pod or the local load to rotate reversely so as to counteract the rotation of the whole high-altitude balloon. In the control process, the motor and the actuating mechanism thereof are required to be in a working state all the time, and if the balloon rotates in one direction continuously, the motor and the actuating mechanism thereof can accelerate continuously and even exceed the rotating speed of the motor. This also presents certain difficulties in the long-term orientation and flight of the balloon platform.
Disclosure of Invention
The invention aims to provide a rotary damping system in the flight of a high-altitude balloon, which designs a novel rotary damping structure for the high-altitude balloon, gradually dissipates kinetic energy in the rotating process of the balloon by adopting a natural dissipation acting mode, reduces or eliminates the rotation of the high-altitude balloon in the flight process, and leads the flight direction of the high-altitude balloon to tend to be stable.
In order to solve the technical problem, an embodiment of the present invention provides a rotary damping system for high-altitude balloon flight, including a tension membrane structure connected to a balloon constraining structure, where the tension membrane structure includes a damping membrane, and a damping membrane transverse pulling rope, a damping membrane vertical pulling rope and a damping membrane diagonal pulling rope which surround the edge of the damping membrane, where,
one end of the damping film transverse pull rope is connected with one end of the damping film diagonal pull rope to form a first connecting point;
the other end of the damping film transverse pull rope is connected with one end of the damping film vertical pull rope to form a second connection point;
the other end of the damping film stay rope is connected with the other end of the damping film vertical stay rope to form a third connection point;
the first, second and third attachment points are each attached to the balloon-restraining structure.
Further, stretch-draw membrane structure still includes first cover bag, second cover bag and third cover bag, first cover bag cover is established on the horizontal stay cord of damping membrane, second cover bag cover is established on the oblique stay cord of damping membrane, third cover bag cover is established on the perpendicular stay cord of damping membrane.
Furthermore, the balloon constraining structure comprises a balloon stay rope, a reinforcing belt, a bottom cluster part, a balloon vertical stay rope and a rigid connecting part, wherein,
the bottom-of-sphere bundling part is positioned at the bottom of the balloon;
the reinforcing belt penetrates through the whole balloon and is connected with the ball bottom bundling part;
the balloon diagonal draw ropes are uniformly distributed around the balloon, one end of each balloon diagonal draw rope is connected with the corresponding reinforcing belt, and the other end of each balloon diagonal draw rope is connected with the first end of the corresponding rigid connecting part;
one end of the balloon vertical pull rope is connected with the sphere bottom bundling part, and the other end of the balloon vertical pull rope is connected with the first end of the rigid connecting part;
the first connection point is connected to the reinforcing strip,
the second connection point is connected to the sole bunching section,
the third connection point is connected to the first end of the rigid connection portion.
Furthermore, the damping film is made of light-weight, high-strength and airtight fabric materials, and comprises nylon cloth and plastic cloth.
Further, rigidity connecting portion are rope ladder structure, rope ladder structure include first rope ladder erect rope, second rope ladder erect rope and a plurality of both ends respectively with first rope ladder erects rope, the second rope ladder erects the rope ladder horizontal pole that the rope is connected, wherein, first rope ladder erects the rope and the second rope ladder erects the rope and weaves the rope for reverse twist with fingers, rope ladder horizontal pole is the rigid member, damping membrane diagonal draw rope with first rope ladder erects the rope and is connected, damping membrane erect the stay cord with second rope ladder erects the rope and is connected.
Furthermore, the rope ladder cross rod is a wooden stick or a carbon fiber pipe.
Further, the rigid connection part is of a rope cage structure, and the damping film stay ropes and the damping film vertical stay ropes are connected to two ends of a diagonal line of the cross section of the rope cage structure respectively.
Further, still include parachute and nacelle, parachute upper end with the second end of rigid connection portion is connected, the lower extreme with the nacelle is connected.
Furthermore, in the stage of balloon release, the tension membrane structure is in an undeployed state, and the balloon stay cable and the damping membrane stay cable jointly restrain the balloon which is not shaped after inflation; in the process of lifting the balloon off, the damping film is gradually unfolded under the tension action of the damping film transverse pull rope, the damping film vertical pull rope and the damping film diagonal pull rope around the damping film, and the rotation of the rotating balloon is reduced or eliminated by the tensioning film structure.
Furthermore, during the flat flying of the balloon, the damping membrane is in a tightening state, the rotating angular speed of the balloon is omega-d theta, and the pneumatic resistance F received by the damping membrane at any angle theta isdComprises the following steps:
Fd＝0.5ρv2S＝0.5ρ(Δv+rdθ)2S (2)
wherein rho is the air density, r is the distance between the geometric center of the damping film and the rotating shaft, S is the area of the damping film, Deltav is the difference between the horizontal flying speed of the balloon and the wind speed at the height,
the mechanical balance equation of the whole system is as follows:
where J is the system moment of inertia.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the rotary damping system in the flight of the high-altitude balloon can achieve considerable technical progress and practicability, has wide industrial utilization value and at least has the following advantages:
the invention designs a novel rotary damping structure for the high-altitude balloon, has simple structure and low cost, adopts a natural dissipation work-doing mode to gradually dissipate the kinetic energy of the high-altitude balloon in the rotating process, reduces or eliminates the rotation of the high-altitude balloon in the flying process, and leads the flying direction of the high-altitude balloon to tend to be stable.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a side view of the components of the high-altitude balloon during the ascent;
FIG. 2 is a partially enlarged view of a high-altitude balloon bulb;
FIG. 3 is a schematic view of the connection structure sphere to the rope root;
FIG. 4 is a schematic view of the connection of the connecting structure ball bottom and the rope root;
FIG. 5 is a schematic view of the connection structure and the rigid connection portion;
FIG. 6 is a schematic view of the sphere rotated to a maximum angle;
FIG. 7 is a schematic view of the sphere rotated to any angle;
figure 8 is a schematic view of the ball rotating to a minimum resistance.
[ notation ] to show
1: the balloon 10: balloon restraint structure
3: tensioned membrane structure 31: first connecting point
32: second connection point 33: third connecting point
2: damping film stay cord 8: damping film transverse pull rope
9: damping film vertical pull rope 7: a balloon stay rope;
1-1: reinforcing bands 1-2: ball bottom bundling part
90: 3-1 of vertical balloon pull rope: second set of bag
3-2: first pocket 3-3: third set of bag
3-4: damping film 4: rigid connection part
5: parachute 6: pod
11: first rope ladder vertical rope 12: second rope ladder vertical rope
13: rope ladder cross bar
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail by way of examples with reference to the accompanying drawings. However, it should be noted that the examples described herein are only intended to illustrate specific embodiments of the present invention so that those skilled in the art can practice the invention after reading the present specification, and not to limit the scope of the present invention. Furthermore, the drawings are not necessarily to scale, the shapes and structures of the devices may be completely represented, and the understanding of the spirit and principles of the present invention may be facilitated. Moreover, it should be understood that portions of this method that are obvious to one skilled in the art may not be repeated herein, but are essential to the invention and should be incorporated as part of the overall disclosure of the invention.
The embodiment of the invention provides a rotary damping system of a high-altitude balloon 1 in flight, which comprises a tension membrane structure 3 connected with a balloon constraint structure 10, wherein the tension membrane structure 3 comprises damping membranes 3-4, damping membrane transverse pull ropes 8, damping membrane vertical pull ropes 9 and damping membrane diagonal pull ropes 2, wherein the edges of the damping membranes 3-4 are surrounded by the damping membranes, one end of each damping membrane transverse pull rope 8 is connected with one end of each damping membrane diagonal pull rope 2 to form a first connection point 31; the other end of the damping film transverse pull rope 8 is connected with one end of the damping film vertical pull rope 9 to form a second connection point 32; the other end of the damping film stay rope 2 is connected with the other end of the damping film vertical stay rope 9 to form a third connection point 33; the first, second and third attachment points 31, 32, 33 are each attached to the balloon-restraining structure 10. In the process of the horizontal flying rotation of the balloon 1, the velocity difference and the rotation angular velocity between the balloon 1 and a local wind field are jointly superposed to generate pneumatic resistance, and the pneumatic resistance generated by the tension membrane structure 3 in the direction opposite to the rotation direction can continuously dissipate the rotation kinetic energy of the system, so that the rotation speed of the system is reduced until the system rotation of the balloon 1 is eliminated.
As shown in fig. 2, the balloon constraining structure 10 includes a balloon stay rope 7, a reinforcing belt 1-1, a bottom bundling part 1-2, a balloon vertical stay rope 90 and a rigid connecting part 4, wherein the bottom bundling part 1-2 is located at the bottom of the balloon 1, and a sphere bundling device is a core component for transmitting buoyancy of the buoyant gas in the balloon 1, and transmits the buoyancy of the balloon 1 to the rigid connecting part 4 through the balloon vertical stay rope 90; the reinforcing band 1-1 penetrates through the whole balloon 1 and is connected with the bottom bundling part 1-2; the balloon stay ropes 7 are uniformly distributed around the balloon 1, one end of each balloon stay rope is connected with the reinforcing belt 1-1, and the other end of each balloon stay rope is connected with the first end of the rigid connecting part 4; one end of the balloon vertical pull rope 90 is connected with the bottom-of-sphere bundling part 1-2, and the other end is connected with the first end of the rigid connecting part 4; the first connection point 31 is connected to the reinforcing belt 1-1, the second connection point 32 is connected to the bottom-of-sphere bundling part 1-2, and the third connection point 33 is connected to the first end of the rigid connection part 4, it can be understood that the damping film vertical pulling rope 9 and the balloon vertical pulling rope 90 can be the same vertical pulling rope, and the tension film structure 3 is located in a triangular region formed by the balloon stay rope 7 and the bottom-of-sphere and the balloon vertical pulling rope 90.
It should be noted that the damping film stay ropes 2 and the balloon stay ropes 7 are the same as the balloon 1 in relative position, but the action and material are different, the balloon stay ropes 7 only bear the tensile force, and the damping film stay ropes 2 need to have a certain friction force and may also bear the tension of the tension film structure 3.
As shown in fig. 4 and 5, the stretch film structure 3 further includes a first bag 3-2, a second bag 3-1 and a third bag 3-3, the first bag 3-2 is sleeved on the horizontal stay cord 8 of the damping film, the second bag 3-1 is sleeved on the diagonal stay cord 2 of the damping film, the third bag 3-3 is sleeved on the vertical stay cord 9 of the damping film, after the balloon 1 is formed, the damping film 3-4 is a stretch film, and the bag transmits the stress in the stretch film to the stay cord around the damping film 3-4, so as to avoid the occurrence of stress concentration.
As an example, the damping film 3-4 can be a light high-strength fabric and a material with certain air tightness, including nylon cloth, plastic cloth, and the like, and the damping film 3-4 can also be cloth with certain bearing capacity or the same material as the balloon 1.
As shown in fig. 5, the rigid connection portion 4 is a rope ladder structure, and the rope ladder structure includes a first rope ladder vertical rope 11, a second rope ladder vertical rope 12, and a plurality of rope ladder cross bars 13 having two ends respectively connected to the first rope ladder vertical rope 11 and the second rope ladder vertical rope 12, wherein the first rope ladder vertical rope 11 and the second rope ladder vertical rope 12 are reverse-twisted braided ropes, and the reverse-twisted braiding is one of rope braiding modes corresponding to the forward-twisted braiding. The weaving mode of the reverse-twisted rope is as follows: the winding direction of the silk threads in each strand is opposite to that of each strand, and the rope cannot generate torsional force when being stressed. Rope ladder horizontal pole 13 is the rigid member, the oblique stay cord of damping membrane 2 with first rope ladder is erected the rope 11 and is connected, the perpendicular stay cord of damping membrane 9 with second rope ladder is erected the rope 12 and is connected. Wherein, rope ladder horizontal pole 13 can be for wooden stick or carbon fiber pipe etc. spheroid collection device erects rope 11 and second rope ladder and erects rope 12 for first rope ladder through the transmission of balloon vertical stay 90 with 1 buoyancy of balloon, and then transmits the rope ladder structure. The rope ladder structure can ensure that the system has certain rotation rigidity. The connection between the rope ladder structure and the damping film 3-4 pulling rope is shown in figure 5.
The system further comprises a parachute 5 and a pod 6, wherein the upper end of the parachute 5 is connected with the second end of the rigid connecting portion 4, and the lower end of the parachute is connected with the pod 6.
In the system assembling process, the damping film transverse pull rope 8 and the damping film diagonal pull rope 2 penetrate through the respective bags and then are converged together to be connected with the reinforcing belt 1-1, as shown in fig. 3, the damping film transverse pull rope 8 and the damping film vertical pull rope 9 penetrate through the bags respectively and then are connected with the spherical bottom bundling part 1-2, as shown in fig. 4. The damping film stay rope 2 and the damping film vertical stay rope 9 are respectively connected with two vertical bearing component rope ladder vertical ropes in the rope ladder after penetrating through the respective bags. The core force-bearing part between the parachute 5 and the damping films 3-4 is a rope ladder structure which can transmit acting force and has certain rigidity, the rotation rigidity of the whole system can be kept, and the connecting rope cannot be twisted due to the rotation of the system.
As the deformation of the rope ladder structure, the rigid connecting part 4 can also be a rope cage structure, the rope cage structure is a cage rope group, namely, a plurality of ropes are supported by rigid parts in the middle, if the section of the middle rigid part is circular, the middle rigid part is a cylindrical rope cage, the middle section can also be quadrilateral or polygonal, the damping film inclined pull rope 2 and the damping film vertical pull rope 9 are respectively connected to the two ends of the diagonal line of the cross section of the rope cage structure, a flange plate can also be additionally arranged in the middle, and the upper part and the lower part of the damping film inclined pull rope and the damping. The rope cage has a complex structure, can transmit larger rotating torque, and is suitable for being used in the structural design of a large-scale high-altitude balloon 1
In the stage of launching the balloon 1, as an example, after the high-altitude balloon 1 is inflated on the ground, the volume of the gas in the balloon is only 5% or even lower than the volume of the whole balloon 1, so that after the inflation on the ground is completed, only the head of the balloon 1 has the gas floating, and the rest of the balloon is not shaped, and the shaped balloon is in a bundling state. After the system is installed, the tension membrane structure 3 is in an undeployed state, the sum of any two lengths is larger than the third edge in an approximate triangle formed by the damping membrane diagonal draw ropes 2, the damping membrane transverse draw ropes 8 and the damping membrane vertical draw ropes 9, and therefore the buoyancy of the inflated balloon 1 is transmitted to the rope ladder structure through the damping membrane diagonal draw ropes 2. Therefore, the balloon stay ropes 7 and the damping film stay ropes 2 which are uniformly distributed along the axial direction of the balloon 1 restrain the balloon 1 which is not deformed after being inflated.
In the process of completing releasing and lifting the balloon 1, along with the increase of the height, the buoyancy lifting gas in the balloon 1 gradually expands, the constraint structure and the damping membranes 3-4 at the bottom of the balloon 1 gradually expand, when the balloon 1 starts to fly horizontally, the buoyancy of the balloon 1 gradually transfers to the vertical balloon pull rope 90 and the diagonal damping membrane pull rope 2 to jointly bear, in the process, the damping membranes 3-4 are completely expanded, and the three ropes, namely the diagonal damping membrane pull rope 2, the horizontal damping membrane pull rope 8 and the vertical damping membrane pull rope 9, which are connected with the damping membranes are gradually expanded to form the tensioned membrane structure 3. The balloon 1 will rely on this tensioned membrane structure 3 to gradually reduce or eliminate rotation until stable flight.
In the process of flying the balloon 1 horizontally, the damping films 3-4 are in a tightened state, the whole system can fly with wind, and due to the fact that the system has large concentrated mass, in the process of flying with wind, the horizontal flying speed of the balloon 1 inevitably has a difference delta v with the wind speed at the height, and the delta v changes the balloon 1 along with the change of the wind speed and the wind direction. During the flying process, the balloon 1 system also rotates, and if the rotation is not eliminated, the rotation is continued, and the sphere rotates to the maximum angle, which greatly influences the aiming and observation of the load to the ground, as shown in fig. 6.
The balloon 1 has a rotational angular velocity ω ═ d θ, and the aerodynamic resistance F received by the damping films 3 to 4 at an arbitrary angle θdComprises the following steps:
Fd＝0.5ρv2S＝0.5ρ(Δv+rdθ)2S (1)
wherein rho is the air density, r is the distance between the geometric center of the damping film 3-4 and the rotating shaft, S is the area of the damping film 3-4, and Deltav is the difference between the horizontal flying speed of the balloon 1 and the wind speed at the height.
The mechanical balance equation of the whole system is as follows:
where J is the system moment of inertia.
Fig. 7 shows a schematic view of the rotation of the ball to an arbitrary angle, and fig. 8 shows a schematic view of the rotation of the ball to a minimum resistance.
Therefore, the rotary damping effect of the balloon 1 is mainly related to the pneumatic resistance of the damping films 3-4, the pneumatic resistance of the damping films 3-4 needs to be increased for accelerating the elimination of the system rotation, the pneumatic resistance can be realized by increasing the areas of the damping films 3-4, the length of the vertical stay rope 9 of the damping films can be increased to increase the areas of the damping films 3-4 in the same system, or the ratio of the diameter to the length of the balloon 1 can be increased, and then the length of the horizontal stay rope is increased to increase the areas of the damping films 3-4. For some balloons 1 with special requirements, the area of the damping film 3-4 can be adjusted by changing the length of three sides of the damping film 3-4, so that the response time is changed, and the actual side length of the damping film 3-4 can be changed by changing the extension and retraction of three pull rope bags, so that the damping area is changed.
The embodiment of the invention designs a novel rotary damping structure for the high-altitude balloon 1, has simple structure and low cost, adopts a natural dissipation work-doing mode to gradually dissipate the kinetic energy of the high-altitude balloon 1 in the rotating process, reduces or eliminates the rotation of the high-altitude balloon 1 in the flying process, and leads the flying direction of the high-altitude balloon 1 to tend to be stable.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.