Full-degree-of-freedom active shaking and vibration reducing device for hydrogen storage tank

Abstract

The utility model belongs to the field of hydrogen energy aircrafts, and particularly relates to a full-degree-of-freedom active shake and vibration reduction device for a hydrogen storage tank, which comprises a base, a plurality of UPU branched chains and a vibration reduction platform, the base and the vibration reduction platform are connected through the UPU branched chains. The two ends of the top of the vibration reduction platform are each provided with a hydrogen storage tank fixing structure used for arranging a hydrogen storage tank, and when the six-degree-of-freedom attitude sensor installed on the base detects that the hydrogen storage tank shakes, the UPU parallel mechanism installed on the base achieves the omni-directional vibration reduction function in the flight process based on the characteristic of multi-degree-of-freedom movement of the UPU parallel mechanism. And finally, the vibration reduction and shake reduction effects are fed back through a six-degree-of-freedom attitude sensor installed on the vibration reduction platform, and the closed-loop full-degree-of-freedom active shake and vibration reduction function is finally achieved.

Description

Technical Field

[0001] The utility model belongs to the field of hydrogen-powered aircraft, and in particular relates to a full-freedom active vibration reduction device for a hydrogen storage tank. Background Art

[0002] The mass energy density of hydrogen fuel is three times that of traditional aviation kerosene and more than 100 times that of lithium-ion batteries. It is a very promising solution to achieve zero emissions in aviation. However, it is limited by its volume energy density. In order to give full play to the advantages of hydrogen fuel, hydrogen needs to be pressurized and stored in the form of liquid hydrogen at -253°C. Therefore, special liquid hydrogen storage is required to ensure that the storage time is long enough, and the hydrogen storage tank on the aircraft needs to withstand at least 20,000 take-offs and landings. Therefore, the anti-collision and vibration reduction design of hydrogen tanks has also become one of the main technical obstacles facing the development of hydrogen-powered aircraft. However, the existing hydrogen storage tank vibration reduction device is mainly installed on the car. When the car is driving, the hydrogen storage tank is mainly subjected to up and down vibration in the car. Unlike the car, the aircraft not only has up and down vibration, but also has vibration in other directions. If this continues for a long time, it is easy to cause damage to the hydrogen storage tank and greatly reduce the service life of the hydrogen storage tank. At the same time, after the hydrogen is liquefied, there is a huge temperature difference with the outside world. Although the high vacuum and strong insulation hydrogen storage tank can reduce the evaporation loss of liquid hydrogen caused by the temperature difference, during the operation of the aircraft, the evaporation gas is generated due to the shaking of the storage tank and other reasons. The problem of liquid storage sloshing is also one of the main causes of liquid storage tank damage. Excessive liquid sloshing can easily cause "elephant foot" type instability and damage to the liquid storage tank.

[0003] Therefore, we can know that:

[0004] Since the current hydrogen tank vibration reduction device is mainly used for vehicle-mounted hydrogen storage tanks, the vibration reduction device mainly reduces the vibration in the direction perpendicular to the installation surface, and has little effect on vibration in other directions. The hydrogen-powered aircraft mainly vibrates when the aircraft is landing. Before the aircraft is completely landed, the aircraft is always in a head-up state, so the vibration direction is not fixed; at the same time, when the aircraft encounters turbulence or strong winds when landing, its vibration direction will not be perpendicular to the installation surface.

[0005] At present, the vibration reduction device of hydrogen tank focuses on solving the vibration problem, but the shaking problem of hydrogen storage can also easily cause the internal hydrogen liquid to gasify and damage the hydrogen storage tank;

[0006] Currently, most hydrogen energy vibration reduction devices use spring or hydraulic open-loop control, and fail to support the function of actively identifying the vibration direction to achieve closed-loop active control. Utility Model Content

[0007] The utility model proposes a full-freedom active vibration reduction device for a hydrogen storage tank, so as to solve the problem that the vibration reduction device in the prior art mainly reduces the vibration in the direction perpendicular to the installation surface, and has little effect on the vibration in other directions.

[0008] In order to achieve the above purpose, the utility model proposes the following technical solutions:

[0009] A full-freedom active vibration reduction device for a hydrogen storage tank, comprising a base, a plurality of UPU branches and a vibration reduction platform; the base and the vibration reduction platform are connected via the UPU branches;

[0010] The UPU chain branch includes a lower chain branch base, a lower chain branch connecting rod, an upper chain branch connecting rod and an upper chain branch base, wherein the lower chain branch base, the telescopic connecting rod and the upper chain branch base are connected in sequence;

[0011] The upper branch chain base is fixed to the bottom of the vibration reduction platform, and the lower branch chain base is fixed to the top of the base;

[0012] Two hydrogen storage tank fixing structures are symmetrically arranged on the top of the vibration reduction platform.

[0013] Preferably, the UPU branch chain further comprises a lower Hooke's hinge and an upper Hooke's hinge;

[0014] The lower branch chain connecting rod is connected to the lower branch chain base through a lower Hooke's hinge, and the upper branch chain connecting rod is connected to the upper branch chain base through an upper Hooke's hinge.

[0015] Preferably, the telescopic link comprises a nested lower branch link and an upper branch link.

[0016] Preferably, the number of the UPU branches is 6, which are the first UPU branch, the second UPU branch, the third UPU branch, the fourth UPU branch, the fifth UPU branch and the sixth UPU branch;

[0017] The first UPU branch chain, the second UPU branch chain, the third UPU branch chain, the fourth UPU branch chain, the fifth UPU branch chain and the sixth UPU branch chain are tiltedly arranged between the base and the vibration reduction platform.

[0018] Preferably, the lower branch chain bases of the UPU branch chain are circumferentially distributed on the base in sequence, and the upper branch chain bases of the UPU branch chain are circumferentially distributed on the vibration reduction platform in sequence.

[0019] Preferably, the inclination angles of the first UPU branch, the second UPU branch, the third UPU branch, the fourth UPU branch, the fifth UPU branch and the sixth UPU branch are the same.

[0020] Preferably, the hydrogen storage tank fixing structure comprises two lower hydrogen tank support frames and one upper hydrogen tank support frame, and the lower hydrogen tank support frames are arc-shaped;

[0021] The two lower hydrogen tank support frames are symmetrically arranged on the vibration reduction platform and are fixedly connected by the upper hydrogen tank support frame;

[0022] The two lower hydrogen tank support frames are located at the bottom, and the upper hydrogen tank support frame is located at the top, together forming an annular circumference.

[0023] Preferably, a rubber ring is provided on the inner wall of the annular circle.

[0024] Preferably, the lower hydrogen tank support frame and the upper hydrogen tank support frame are connected by bolts.

[0025] Preferably, a lower six-axis attitude sensor is arranged at the center of the base, and an upper six-axis attitude sensor is arranged at the center of the vibration reduction platform.

[0026] The utility model is beneficial in that:

[0027] A full-freedom active vibration reduction device for a hydrogen storage tank is proposed, wherein the base and the vibration reduction platform are connected by multiple UPU branches, and the hydrogen storage tank is arranged on the vibration reduction platform. Multi-degree-of-freedom movement is performed through the multiple UPU branches to achieve full-directional vibration reduction function during flight, solving the problem of single vibration reduction direction in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0029] In the figure:

[0030] Figure 1 It is a schematic diagram of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0031] Figure 2 It is a schematic diagram of the UPU branch chain structure;

[0032] Figure 3 It is a schematic diagram of the UPU branch chain distribution;

[0033] Figure 4 This is a schematic diagram of the fixed structure of the hydrogen storage tank;

[0034] Figure 5 Schematic diagram of the rubber ring;

[0035] Figure 6 A schematic diagram of the normal posture of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0036] Figure 7 A schematic diagram of the X-direction vibration of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0037] Figure 8 A schematic diagram of the Z-direction vibration of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0038] Fig. 9 A schematic diagram of the Y-direction vibration of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0039] Fig.10 A schematic diagram of the pitch direction vibration of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0040] Fig.11 A schematic diagram of the rolling direction vibration of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank;

[0041] Fig.12 This is a schematic diagram of the yaw vibration of a full-degree-of-freedom active vibration reduction device for a hydrogen storage tank. DETAILED DESCRIPTION

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0043] The following detailed descriptions are all exemplary descriptions, and are intended to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0044] See also Figure 1 As shown, the utility model provides a full-freedom active vibration reduction device for a hydrogen storage tank, the device comprising a base 1, six UPU branches and a vibration reduction platform 8; the base 1 and the vibration reduction platform 8 are both circular.

[0045] The UPU branch includes a first UPU branch 2 , a second UPU branch 3 , a third UPU branch 4 , a fourth UPU branch 5 , a fifth UPU branch 6 and a sixth UPU branch 7 .

[0046] like Figure 2 As shown, the UPU branches have the same structure as each other, which are, from top to bottom, a lower branch chain base 2-1, a lower Hooke's hinge 2-2, a lower branch chain connecting rod 2-3, an upper branch chain connecting rod 2-4, an upper Hooke's hinge 2-5 and an upper branch chain base 2-6; the UPU branch chain is connected to the base 1 through the lower branch chain base 2-1, and is connected to the vibration reduction platform 8 through the upper branch chain base 2-6; the lower branch chain connecting rod 2-3 is connected to the lower branch chain base 2-1 through the lower Hooke's hinge 2-2, and the upper branch chain connecting rod 2-4 is connected to the upper branch chain base 2-6 through the upper Hooke's hinge 2-5.

[0047] The lower branch link 2-3 and the upper branch link 2-4 together form a telescopic structure.

[0048] like Figure 3 As shown, the first UPU branch chain 2, the second UPU branch chain 3, the third UPU branch chain 4, the fourth UPU branch chain 5, the fifth UPU branch chain 6 and the sixth UPU branch chain 7 are circumferentially distributed on the edge of the base 1 in sequence; among them, the six lower branch chain bases 2-1 are circumferentially distributed on the base 1, and the six upper branch chain bases 2-6 are circumferentially distributed on the bottom of the vibration reduction platform 8.

[0049] The first UPU branch chain 2 , the second UPU branch chain 3 , the third UPU branch chain 4 , the fourth UPU branch chain 5 , the fifth UPU branch chain 6 and the sixth UPU branch chain 7 are normally tiltedly arranged between the base 1 and the vibration reduction platform 8 .

[0050] The first UPU branch 2, the second UPU branch 3, the third UPU branch 4, the fourth UPU branch 5, the fifth UPU branch 6 and the sixth UPU branch 7 are normally inclined at the same angle.

[0051] The vibration reduction platform 8 is provided with two hydrogen storage tank fixing structures, which are located at two ends of the vibration reduction platform 8 .

[0052] like Figure 4 As shown, the hydrogen storage tank fixing mechanism includes two lower hydrogen tank support frames 9, an upper hydrogen tank support frame 10 and a rubber ring 11. The lower hydrogen tank support frame 9 is symmetrically fixed on the vibration reduction platform 8. The lower hydrogen tank support frame 9 is arc-shaped. The two lower hydrogen tank support frames 9 are fixedly connected by the upper hydrogen tank support frame 10. The two lower hydrogen tank support frames 9 and the upper hydrogen tank support frame 10 together form a circular ring. The inner circumference of the circular ring is provided with a rubber ring 11, as shown in FIG. Figure 5 As shown, it is used for connecting the hydrogen storage tank and the hydrogen storage tank fixing structure.

[0053] In a specific implementation, the lower hydrogen tank support frame 9 and the upper hydrogen tank support frame 10 are fixed by bolts 14 .

[0054] In a specific embodiment, the telescopic structure of the lower branch link 2-3 and the upper branch link 2-4 is actively telescoped by a cylinder, a pressure cylinder or a motor.

[0055] A lower six-axis attitude sensor 12 is arranged at the center of the base 1 .

[0056] An upper six-axis attitude sensor 13 is disposed at the center of the vibration reduction platform 8 .

[0057] When the vibration and shaking in the heading direction (X direction) are recognized by the lower six-degree-of-freedom attitude sensor 12 installed on the base 1, the vibration reduction device can reduce the shaking by moving forward and backward.

[0058] The normal posture of the ground of the utility model is as follows Figure 6As shown in the figure, the specific process of vibration reduction is:

[0059] When the six-degree-of-freedom attitude sensor installed on the base 1 detects vertical (Z-direction) vibration and shaking, the vibration reduction device can move up and down to reduce the shaking, such as Figure 7 shown.

[0060] When the six-degree-of-freedom attitude sensor installed on the base 1 detects vertical (Y-direction) vibration and shaking, the vibration reduction device can move left and right to reduce the shaking, such as Figure 8 shown.

[0061] When the six-degree-of-freedom attitude sensor installed on the base 1 identifies the vibration and shaking of the pitch (rotation direction around Y), the vibration reduction device can reduce the vibration by pitching. Fig. 9 shown.

[0062] When the six-degree-of-freedom attitude sensor installed on the base 1 identifies the vibration and shaking in the rolling direction (rotation direction around X), the vibration reduction device can move to reduce the shaking, such as Fig.10 shown.

[0063] When the six-degree-of-freedom attitude sensor installed on the base 1 identifies the vibration and shaking in the yaw direction (rotation direction around Z), the vibration reduction device can reduce the shaking by yaw motion, such as Fig.11 shown.

[0064] When vibrations in other composite directions (such as heading + pitch, yaw + pitch, etc.) are identified, active vibration reduction can also be achieved, such as Fig.12 shown.

[0065] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A full-degree-of-freedom active vibration reduction device for a hydrogen storage tank, characterized in that: It includes a base, a plurality of UPU branches and a vibration reduction platform; the base and the vibration reduction platform are connected by the UPU branches; The UPU chain branch includes a lower chain branch base, a lower chain branch connecting rod, an upper chain branch connecting rod and an upper chain branch base, wherein the lower chain branch base, the telescopic connecting rod and the upper chain branch base are connected in sequence; The upper branch chain base is fixed to the bottom of the vibration reduction platform, and the lower branch chain base is fixed to the top of the base; Two hydrogen storage tank fixing structures are symmetrically arranged on the top of the vibration reduction platform; The number of UPU branches is 6, which are the first UPU branch, the second UPU branch, the third UPU branch, the fourth UPU branch, the fifth UPU branch and the sixth UPU branch; The first UPU branch chain, the second UPU branch chain, the third UPU branch chain, the fourth UPU branch chain, the fifth UPU branch chain and the sixth UPU branch chain are tiltedly arranged between the base and the vibration reduction platform; A lower six-axis attitude sensor is arranged at the center of the base, and an upper six-axis attitude sensor is arranged at the center of the vibration reduction platform; The telescopic structure of the lower branch chain link and the upper branch chain link is actively telescoped by a cylinder, a hydraulic cylinder or a motor.

2. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 1, characterized in that: The UPU branch chain also includes a lower Hooke's hinge and an upper Hooke's hinge; The lower branch chain connecting rod is connected to the lower branch chain base through a lower Hooke's hinge, and the upper branch chain connecting rod is connected to the upper branch chain base through an upper Hooke's hinge.

3. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 1, characterized in that: The telescopic link comprises a nested lower branch link and an upper branch link.

4. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 1, characterized in that: The lower branch chain bases of the UPU branch chain are circumferentially distributed on the base in sequence, and the upper branch chain bases of the UPU branch chain are circumferentially distributed on the vibration reduction platform in sequence.

5. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 1, characterized in that: The inclination angles of the first UPU branch, the second UPU branch, the third UPU branch, the fourth UPU branch, the fifth UPU branch and the sixth UPU branch are the same.

6. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 1, characterized in that: The hydrogen storage tank fixing structure comprises two lower hydrogen tank support frames and an upper hydrogen tank support frame, and the lower hydrogen tank support frame is arc-shaped; The two lower hydrogen tank support frames are symmetrically arranged on the vibration reduction platform and are fixedly connected by the upper hydrogen tank support frame; The two lower hydrogen tank support frames are located at the bottom, and the upper hydrogen tank support frame is located at the top, together forming an annular circumference.

7. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 6, characterized in that: A rubber ring is arranged on the inner wall of the annular circle.

8. A full-freedom active vibration reduction device for a hydrogen storage tank as claimed in claim 6, characterized in that: The lower hydrogen tank support frame is connected to the upper hydrogen tank support frame by bolts.

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