A vibration reduction device for the bottom of an airship propulsion bracket
The combined structure of the bottom frame, top rod group and shock absorber solves the problem of multi-directional vibration of the airship propulsion bracket, achieves effective vibration reduction and isolation, and ensures the safe flight of the airship.
Patent Information
- Application Number
- CN202411960466.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2044-12-30
AI Technical Summary
The connection structure of the existing airship propulsion bracket cannot effectively absorb multi-directional vibration impact, causing the hull vibration to affect flight safety, and the rigid support structure transmits high-frequency vibration to the hull.
A vibration reduction device consisting of a bottom frame, a top rod group and a shock absorber is adopted, which is connected by a ball head support and a revolute pair to achieve multi-directional vibration reduction, and the damping and stiffness can be adjusted to avoid resonance.
It can effectively absorb the vibration energy of the propulsion system, reduce the impact on the hull, avoid resonance, ensure the flight safety of the airship, and has the function of transmitting the thrust, torque and gravity of the propulsion system.
Smart Images
Figure CN119737407B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of vibration reduction technology, and specifically relates to a vibration reduction device for the bottom of an airship propulsion bracket. Background Art
[0002] Generally, the propulsion system of a large airship consists of a motor and a propeller, which is connected to the hull through a propulsion bracket. During the flight of the airship, the dynamic imbalance force and aerodynamic force of the propeller will be transmitted to the hull through the propulsion bracket, which is the largest excitation source of the hull vibration. The vibration of the hull directly affects the flight safety of the airship.
[0003] Currently, most airship propulsion systems utilize single-axis vibration damping or rigid support structures. Single-axis vibration damping solutions cannot absorb vibration impacts in multiple directions, resulting in low connection reliability. Conventional rigid support structures transmit all high-frequency vibrations generated by the propulsion system to the hull. Neither connection solution is conducive to vibration isolation between the propulsion system and the hull. Summary of the Invention
[0004] To address the above problems, the present invention proposes a dedicated vibration reduction device for the bottom of the airship propulsion bracket, which reduces the force transmitted to the hull by the propulsion system. It has good vibration reduction and impact resistance, can significantly absorb the energy of the propulsion system vibration, change the vibration frequency of the propulsion system, avoid resonance with the hull, effectively isolate the vibration influence of the maximum excitation force on the hull, and ensure the flight safety of the airship.
[0005] The bottom vibration damping device of the airship propulsion bracket of the present invention is installed between the bottom of the hull and the airship propulsion bracket, and is composed of a bottom frame, a top rod group and a shock absorber.
[0006] The base frame is a rectangular frame structure formed by four circumferential base frame connecting rods connected end to end. Its outer surface is tightly secured to the outer wall of the hull. On the inner side of the base frame, base frame ball joints are located at corresponding positions on the outer wall at both ends of each base frame connecting rod and in the middle. These base frame ball joints have mounting holes for ball joints. The axis of the ball joint mounting hole in each base frame connecting rod is perpendicular to the axis of the base frame connecting rod and parallel to the plane of the top rod assembly. The center points of the balls on all base frame ball joints lie within plane A, which is parallel to the propulsion direction of the propulsion system.
[0007] The top rod assembly comprises four circumferentially arranged cylindrical top connecting rods, corresponding in position to the four bottom frame connecting rods. Two top ball supports are designed on the outer walls at both ends of each top connecting rod. Each top ball support has a ball mounting hole. The axes of the two ball mounting holes are perpendicular to each other and to the axis of the top connecting rod, intersecting with the axis of the top connecting rod. Balls are mounted in the ball mounting holes. The two top ball supports at both ends of the top connecting rod correspond circumferentially, and the axes of the ball mounting holes in the corresponding pair of top ball supports are perpendicular to plane A.
[0008] The shock absorber includes four parallel shock absorbers and 16 vertical shock absorbers; the four parallel shock absorbers have ball heads at both ends, and the ball heads on the top ball head supports corresponding to the adjacent top connecting rods are coaxially connected through a connecting shaft to form a rotating pair.
[0009] The 16 shock absorbers are grouped into four groups, each installed between the upper and lower opposing bottom and top frame connecting rods. The ball heads at one end of shock absorbers A and D are coaxially connected to the ball heads on the bottom frame ball head supports at both ends of the bottom frame connecting rod via a connecting shaft, forming a revolute pair. The ball heads at one end of shock absorbers B and C are coaxially connected to the ball heads on the bottom frame ball head support in the middle of the bottom frame connecting rod via a rotating shaft, forming a revolute pair. The ball heads at the other ends of shock absorbers A and B are coaxially connected to the ball heads on the top ball head support at one end of the top connecting rod via a connecting shaft, forming a revolute pair. The ball heads at the other ends of shock absorbers C and D are coaxially connected to the ball heads on the top ball head support at the other end of the top connecting rod via a rotating shaft, forming a revolute pair.
[0010] The advantages of the present invention are:
[0011] 1. The vibration reduction device at the bottom of the airship propulsion bracket of the present invention can meet the vibration reduction requirements of the bottom of the airship propulsion bracket.
[0012] 2. The vibration reduction device at the bottom of the airship propulsion bracket of the present invention can achieve vibration suppression in multiple directions of the airship propulsion system.
[0013] 3. The vibration reduction device at the bottom of the airship propulsion bracket of the present invention can adjust the damping and stiffness of the vibration reduction device in different directions according to the dynamic characteristics of the airship propulsion system and the hull to avoid resonance.
[0014] 4. The vibration reduction device at the bottom of the airship propulsion bracket of the present invention has a simple structure, light weight, simple connection and low installation precision requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the installation position of the vibration reduction device at the bottom of the airship propulsion bracket of the present invention.
[0016] Figure 2This is a schematic structural diagram of the vibration reduction device at the bottom of the airship propulsion bracket of the present invention.
[0017] Figure 3 This is a schematic diagram of the bottom frame structure of the vibration reduction device at the bottom of the airship propulsion bracket of the present invention.
[0018] Figure 4 This is a schematic diagram of the top connecting rod structure in the bottom vibration reduction device of the airship propulsion bracket of the present invention.
[0019] Figure 5 This is a schematic diagram of the structure of the spring shock absorber in the vibration reduction device at the bottom of the airship propulsion bracket of the present invention.
[0020] Figure 6 This is a schematic diagram of the double ball head connection method.
[0021] Figure 7 This is a schematic diagram of the three-ball joint connection method.
[0022] In the picture:
[0023] 1-hull 2-airship propulsion bracket 3-bottom frame
[0024] 4-Vertical vibration damper group 5-Top rod group 6-Horizontal vibration damper
[0025] 301- bottom frame connecting rod 302- bottom frame hinge seat 401- damper
[0026] 402- shock absorber spring 403- spring seat 404- adjustment handle
[0027] 401a-outer cylinder 401b-piston rod 501-top connecting rod
[0028] 502-top hinge seat DETAILED DESCRIPTION
[0029] The present invention will be described in further detail below with reference to the accompanying drawings.
[0030] The present invention provides a vibration reduction device at the bottom of the airship propulsion bracket, such as Figure 1 As shown, it is installed between the bottom of the hull 1 and the airship propulsion bracket 2; the overall structure is as follows Figure 2 As shown, it is composed of a bottom frame 3, a vertical vibration absorber group 4, a top rod group 5 and a horizontal vibration absorber group 6.
[0031] The bottom frame 3 is a rectangular frame structure formed by welding four circumferential columnar bottom frame connecting rods 301 made of aluminum or titanium alloy. Figure 3As shown, the bottom frame 3 is fixed to the bottom surface of the hull 1 through multi-point binding constraints, ensuring that the outer surface of the bottom frame 3 closely fits the outer wall of the hull 1, allowing the bottom frame 3 to conform to the shape of the hull 1. Because the outer surface of the airship is curved, the rectangular surface formed by the four bottom frame connecting rods 301 is also a curved surface. The size of the bottom frame 3 depends on the weight of the propulsion system, the shear capacity of the hull material, and the size of the propeller blades.
[0032] like Figure 4 As shown, the top rod assembly 5 comprises four circumferentially arranged cylindrical top connecting rods 501, constructed from aluminum or titanium alloy tubes. These four cylindrical top connecting rods 501 are coplanar and correspond vertically with the four bottom frame connecting rods 301. These four top connecting rods 501 are used to connect the propulsion brackets, forming the overall frame through the horizontal damper assembly 6. Furthermore, these rods are connected to the bottom frame 3 through the vertical damper assembly 4, forming an integrated shock-absorbing system.
[0033] On the inner side of the base frame 3, ball supports 302 are located at corresponding locations along the outer circumference of each base frame connecting rod 301, as well as at the middle. These supports 302 have ball mounting holes for connecting to the vertical shock absorber assembly 4. The axis of the ball mounting hole in each base frame connecting rod 301 is perpendicular to the axis of the base frame connecting rod 301 and parallel to the plane of the top rod assembly 5. The center points of the balls on all base frame ball supports 302 lie within plane A, which is parallel to the propulsion direction of the propulsion system.
[0034] In the aforementioned top rod assembly 5, two top ball supports 502 are designed on the outer walls at both ends of each top connecting rod 501. Each top ball support 502 has a ball mounting hole. The axes of the two ball mounting holes are perpendicular to each other and to the axis of the top connecting rod 501, intersecting with the axis of the top connecting rod 501. The two top ball supports 502 at both ends of the top connecting rod 501 correspond circumferentially, and the axis of the ball mounting hole in the corresponding set of top ball supports 502 is perpendicular to plane A. These are used for connecting to the horizontal shock absorber assembly 6; the other set of top ball supports 502 is used for connecting to the vertical shock absorber assembly 4.
[0035] A ball head is installed in each ball head installation hole in the bottom frame 3 and the top rod assembly 5.
[0036] The vertical shock absorber group 4 includes 16 spring shock absorbers, 4 in a group, which are installed between the bottom frame connecting rod 301 and the top connecting rod at the corresponding upper and lower positions. The four groups of spring shock absorbers are installed in the same way. The spring shock absorber structure and the installation method of a single group of spring shock absorbers are described below:
[0037] The spring shock absorber is made of steel and includes a damper 401, a shock absorbing spring 402, a spring seat 403 and an adjustment handle 404. Figure 5As shown, the damper 401 consists of a cylindrical outer tube 401a and a piston rod 401b. The head piston of the piston rod 401b is inserted into the outer tube through the front opening. The head piston can be moved along the axis of the outer tube 401a by pushing and pulling the piston rod 401b. The end of the piston rod 401b is coaxially connected to the front side of the circular spring seat 403. The shock absorber ball head support 405 is designed in the middle of the rear side of the spring seat 403 and the middle of the front end of the outer tube 401a, and the hole for the ball head is opened.
[0038] The piston rod 401b is sheathed with a damping spring 402, the distal end of which connects to the front side of the spring seat 403. The rear end of the damping spring 402 is sheathed within the outer cylinder 401a, limiting its radial displacement. It also connects to a circular, plate-shaped adjustment handle 404 threaded onto the outer cylinder 401a. By rotating the adjustment handle 404, the axial position of the adjustment handle within the outer cylinder 401a is adjusted, thereby adjusting the stiffness of the damping spring 402. A toothed structure is designed around the circumference of the adjustment handle to increase friction during rotation.
[0039] The four spring shock absorbers of the above structure are shock absorbers A to D. Among them, the ball heads on the shock absorber ball head supports 405 at the ends of the outer tubes of shock absorbers A and shock absorbers D are respectively coaxially connected to the ball heads on the bottom frame ball head supports 302 at both ends of the bottom frame connecting rod 301 through connecting shafts to form a revolute pair, as shown in FIG. Figure 6 The ball head on the shock absorber ball head support 405 at the outer tube end of shock absorber B and shock absorber C and the ball head on the bottom frame ball head support 302 at the middle of the bottom frame connecting rod 301 are coaxially connected through a rotating shaft to form a revolving pair, as shown in FIG. Figure 7 As shown, the ball head on the ball head support on the rear side of the spring seat 403 in shock absorbers A and B is coaxially connected to the ball head on the top ball head support 502 at one end of the top connecting rod 501 via a connecting shaft to form a revolute pair. The ball head on the shock absorber ball head support on the rear side of the spring seat 403 in shock absorbers C and D is coaxially connected to the ball head on the top ball head support 502 at the other end of the top connecting rod 501 via a rotating shaft to form a revolute pair. Ultimately, three right-angled isosceles triangle shock absorbing mechanisms are formed by the four spring shock absorbers, the bottom frame connecting rod 301, and the top connecting rod 501.
[0040] The parallel shock absorber group includes four spring shock absorbers of the aforementioned structure, and the ball heads on the shock absorber ball head supports at both ends of the spring shock absorber are coaxially connected to the ball heads on the top ball head supports 502 opposite to the adjacent top connecting rods through connecting shafts to form a revolute pair.
[0041] Finally, the present invention forms a vibration reduction device at the bottom of the airship propulsion bracket, in which the bottom of the propulsion bracket is fixedly connected to the four top rods, thereby realizing vibration isolation between the airship propulsion bracket 2 and the hull 1. The vibration reduction device is designed with dampers in three directions, which can absorb vibration energy in three directions (front and back, up and down, and parallel to the propulsion bracket direction); and the articulated seats at both ends of the shock absorber in the shock reduction device adopt spherical articulated joints to ensure that the shock absorber is a two-force rod, thereby increasing the load-bearing capacity of the shock absorber and making the overall shock absorption device have sufficient strength to withstand the tension, torque and gravity of the propulsion system; at the same time, the damping of the damper and the stiffness of the spring can be adjusted according to the dynamic characteristics of the propeller and the propulsion bracket on the flexible hull, which can avoid resonance between the propulsion system and the flexible hull.
[0042] The vibration reduction device at the bottom of the airship propulsion bracket of the present invention can effectively isolate the vibration of the propulsion system from being transmitted to the hull during the flight of the airship, reduce the impact of the propulsion system on the hull, avoid resonance between the propulsion system and the hull, and at the same time have the function of transmitting the tension, torque and gravity of the propulsion system.
Claims
1. A vibration reduction device for the bottom of an airship propulsion support, characterized by: Installed between the bottom of the hull and the airship propulsion bracket, it consists of a bottom frame, a top rod group and a shock absorber; The bottom frame is a rectangular frame structure composed of four circumferential bottom frame connecting rods connected end to end, and the outer side surface can be tightly fixed to the outer wall of the hull; on the inner side surface of the bottom frame, bottom frame ball head supports are designed at the corresponding positions on the circumference of the outer wall at both ends of each bottom frame connecting rod and in the middle, and the bottom frame ball head supports are provided with ball head mounting holes, in which ball heads are mounted; in each bottom frame connecting rod, the axis of the ball head mounting hole on the bottom frame ball head support is perpendicular to the axis of the bottom frame connecting rod and parallel to the plane where the top rod group is located; at the same time, the center points of the ball heads on all bottom frame ball head supports are located in plane A, and plane A is parallel to the propulsion direction of the propulsion system; The top rod assembly comprises four cylindrical top connecting rods arranged circumferentially, and the four cylindrical top connecting rods correspond to the upper and lower positions of the four bottom frame connecting rods respectively; two top ball head supports are designed on the outer wall at both ends of each top connecting rod, and the two top ball head supports are provided with ball head mounting holes, the axes of the two ball head mounting holes are perpendicular to each other and to the axis of the top connecting rod; balls are mounted in the ball head mounting holes; the two top ball head supports at both ends of the top connecting rod correspond to each other in circumferential positions, and the axes of the ball head mounting holes on a group of corresponding top ball head supports are perpendicular to plane A; The shock absorber includes four parallel shock absorbers and 16 vertical shock absorbers; the four parallel shock absorbers have ball heads at both ends, and the ball heads on the top ball head supports corresponding to the adjacent top connecting rods are coaxially connected through a connecting shaft to form a revolute pair; The 16 shock absorbers are grouped into 4 groups and are respectively installed between the upper and lower opposite bottom frame connecting rods and the top connecting rods; among them, the ball heads at one end of shock absorber A and shock absorber D are respectively coaxially connected to the ball heads on the bottom frame ball head supports at both ends of the bottom frame connecting rod through a connecting shaft to form a revolving pair; the ball heads at one end of shock absorber B and shock absorber C are coaxially connected to the ball heads on the bottom frame ball head support in the middle of the bottom frame connecting rod through a rotating shaft to form a revolving pair; the ball heads at the other ends of shock absorber A and shock absorber B are coaxially connected to the ball heads on the top ball head support at one end of the top connecting rod through a connecting shaft to form a revolving pair; the ball heads at the other ends of shock absorber C and shock absorber D are coaxially connected to the ball heads on the top ball head support at the other end of the top connecting rod through a rotating shaft to form a revolving pair.
2. The vibration reduction device for the bottom of the airship propulsion support according to claim 1, characterized in that: Between the upper and lower opposite bottom frame connecting rods and the top connecting rods, the included angle between the adjacent shock absorber axes is 90 degrees.
3. The vibration reduction device for the bottom of the airship propulsion support according to claim 1, characterized in that: The shock absorber includes a damper, a shock absorbing spring, a spring seat and an adjustment handle; wherein the damper consists of a cylindrical outer tube and a piston rod; the head piston of the piston rod is extended into the outer tube through the front end opening of the outer tube; the end of the piston rod is coaxially fixedly connected to the front side surface of the circular spring seat; the middle part of the rear side surface of the spring seat and the middle part of the front end surface of the outer tube are both designed with a shock absorber ball head support, and a hole is opened on it to install the ball head; the outside of the above-mentioned piston rod is covered with a shock absorbing spring, and the end of the shock absorbing spring is connected to the front side surface of the spring seat; the rear end of the shock absorbing spring is covered on the outer tube to limit the radial displacement of the shock absorbing spring, and at the same time is connected to the circular plate-shaped adjustment handle threaded on the outer tube; by rotating the adjustment handle, the position of the adjustment handle in the axial direction of the outer tube is realized, thereby realizing the adjustment of the stiffness of the shock absorbing spring.
4. The vibration reduction device for the bottom of an airship propulsion support according to claim 1, characterized in that: The bottom frame connecting rod and the top connecting rod are made of aluminum or titanium alloy.