Airship propulsion support bottom damping device

Abstract

The invention discloses a bottom damping device for an airship propulsion support. The bottom damping device is installed between the bottom of an airship body and the airship propulsion support. Comprising an upper-layer rectangular frame structure, a lower-layer rectangular frame structure and a plurality of shock-absorbing dampers connected between the frame structures on the two sides. Wherein the bottom frame is formed by connecting four connecting rods end to end and is attached and fixed to a boat body. And the end parts of the top-layer frame connecting rods are connected through shock-absorbing dampers and are connected with a propeller bracket. Each connecting rod in the bottom frame is connected with the connecting rods located on the same side in the top layer frame through three shock absorption dampers. The shock-absorbing dampers are connected with the connecting rods in a spherical hinge mode, and three isosceles right triangles are formed between the three shock-absorbing dampers on the same side and the upper connecting rod and between the three shock-absorbing dampers on the same side and the lower connecting rod. Therefore, the force transmitted to the airship body by the propelling system can be reduced, vibration suppression of the airship propelling system in multiple directions is achieved, damping and rigidity of the damping device in different directions can be adjusted according to the dynamic characteristics of the airship propelling system and the airship body, and resonance is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration reduction, and specifically relates to a vibration reduction device at 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 unbalanced 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] At present, most of the bottom of the airship propulsion bracket is connected with a single-axis vibration reduction or a rigid support structure. The single-axis vibration reduction solution cannot absorb the vibration impact force in multiple directions, and the connection reliability is low. The conventional rigid support structure will transfer all the high-frequency vibrations generated by the propulsion device to the hull. Both of these connection solutions are not conducive to vibration isolation between the propulsion system and the hull. Summary of the invention

[0004] In view of the above problems, the present invention proposes a special vibration reduction device at the bottom of the airship propulsion bracket, which reduces the force transmitted to the hull by the propulsion system, has good vibration reduction and impact resistance, can obviously 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 reduction 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 bottom frame is a rectangular frame structure formed by four bottom frame connecting rods connected end to end in a circumferential direction, and the outer side surface can be tightly fitted and 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 of the two ends of each bottom frame connecting rod and the circumferential position of the middle outer wall. The bottom frame ball head supports are provided with ball head mounting holes, and the ball heads are installed in the holes; 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.

[0007] The top rod assembly is composed of 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 walls at both ends of each top connecting rod, and ball head mounting holes are opened on the two top ball head supports. The axes of the two ball head mounting holes are perpendicular to each other, and are commonly perpendicular to the axis of the top connecting rod, and intersect with the axis of the top connecting rod; a ball head is installed in the ball head mounting hole; the circumferential positions of the two top ball head supports at both ends of the top connecting rod correspond, and the axes of the ball head mounting holes on a group of top ball head supports with corresponding positions are perpendicular to plane A.

[0008] The shock absorber comprises 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 respectively corresponding to the adjacent top connecting rods are coaxially connected through a connecting shaft to form a revolute pair.

[0009] 16 shock absorbers are grouped into 4 groups, which are respectively installed between the bottom frame connecting rod and the top connecting rod which are opposite to each other. Among them, the ball heads at one end of shock absorber A and shock absorber D are respectively coaxially connected with 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 with 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 with 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 with 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.

[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 requirement. 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 2It 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 It is a schematic diagram of the bottom frame structure of the bottom vibration reduction device of the airship propulsion support of the present invention.

[0018] Figure 4 The diagram is a schematic diagram of the top connecting rod structure in the bottom vibration reduction device of the airship propulsion support of the present invention.

[0019] Figure 5 The diagram is a schematic diagram of the structure of the spring shock absorber in the vibration reduction device at the bottom of the airship propulsion support of the present invention.

[0020] Figure 6 Schematic diagram of double ball head connection.

[0021] Figure 7 Schematic diagram of three-ball joint connection.

[0022] In the figure:

[0023] 1-hull 2-airship propulsion bracket 3-bottom frame

[0024] 4-vertical shock absorber group 5-top rod group 6-horizontal shock absorber

[0025] 301- bottom frame connecting rod 302- bottom frame hinge seat 401- damper

[0026] 402- shock absorbing 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 further described in detail below in conjunction with the accompanying drawings.

[0030] The vibration reduction device at the bottom of the airship propulsion bracket of the present invention is as follows: 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 shown Figure 2 As shown, it is composed of a bottom frame 3, a vertical vibration damper group 4, a top rod group 5 and a horizontal vibration damper 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, end to end. Figure 3As shown, the bottom frame 3 is fixedly installed on the bottom surface of the hull 1 through multi-point binding constraints, ensuring that the outer side of the bottom frame 3 can fit closely with the outer wall of the hull 1, so that the bottom frame 3 and the hull 1 keep the shape. Since the outer surface of the airship is a curved surface, the rectangular surface formed by the four bottom frame connecting rods 301 is a curved surface. The size of the bottom frame 3 depends on the weight of the propulsion system, the shear bearing capacity of the hull material and the size of the blades.

[0032] like Figure 4 As shown, the top rod group 5 is four columnar top connecting rods 501 arranged circumferentially, and is made of aluminum tubes or titanium alloy tubes. The four columnar top connecting rods 501 are coplanar and correspond to the upper and lower positions of the four bottom frame connecting rods 301. The four top connecting rods 501 are used to connect the propulsion bracket, and are connected through the horizontal shock absorber group 6 to form an overall frame, and are connected to the bottom frame 3 through the vertical shock absorber group 4 to form an overall shock absorbing device.

[0033] On the inner side of the bottom frame 3, the bottom frame ball head supports 302 are designed at the corresponding positions of the circumferential direction of the outer wall at both ends and the middle of each bottom frame connecting rod 301. The bottom frame ball head supports 302 are provided with ball head mounting holes for connecting the vertical shock absorber group 4. In each bottom frame connecting rod 301, the axis of the ball head mounting hole on the bottom frame ball head support 302 is perpendicular to the axis of the bottom frame connecting rod 301 and parallel to the plane where the top rod group 5 is located. At the same time, the center points of the ball heads on all the bottom frame ball head supports 302 are located in the plane A, and the plane A is parallel to the propulsion direction of the propulsion system.

[0034] In the above-mentioned top rod assembly 5, two top ball supports 502 are designed on the outer wall at both ends of each top connecting rod 501, and ball mounting holes are opened on the two top ball supports 502. The axes of the two ball mounting holes are perpendicular to each other, and are perpendicular to the axis of the top connecting rod 501, and intersect with the axis of the top connecting rod 501. The two top ball supports 502 at both ends of the top connecting rod 501 have corresponding circumferential positions, and the axes of the ball mounting holes on the corresponding set of top ball supports 502 are perpendicular to the plane A, and are used to connect the horizontal shock absorber group 6; the other set of top ball supports 502 are used to connect the vertical shock absorber group 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 corresponding to the 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 is composed of a columnar outer tube 401a and a piston rod 401b. The head piston of the piston rod 401b is placed in the outer tube through the front end opening of the outer tube, and 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 fixedly connected to the front side of the circular spring seat 403. The middle part of the rear side of the spring seat 403 and the middle part of the front end face of the outer tube 401a are both designed with a shock absorber ball head support 405, and a hole is opened on it to install the ball head.

[0038] The piston rod 401b is covered with a damping spring 402, and the end of the damping spring 402 is connected to the front side of the spring seat 403; the rear end of the damping spring 402 is covered on the outer cylinder 401a to limit the radial displacement of the damping spring 402, and is connected to the circular plate-shaped adjustment handle 404 threadedly sleeved on the outer cylinder 401a. By rotating the adjustment handle 404, the position of the adjustment handle 404 in the axial direction of the outer cylinder 401a is achieved, thereby achieving the stiffness adjustment of the damping spring 402. A toothed structure is designed on the circumference of the adjustment handle to increase the friction when the adjustment handle 404 is rotated.

[0039] The four spring shock absorbers of the above structure are shock absorbers A to D respectively; wherein the ball heads on the shock absorber ball head support 405 at the ends of the outer tubes of shock absorbers A and shock absorbers D are respectively coaxially connected with the ball heads on the bottom frame ball head support 302 at both ends of the bottom frame connecting rod 301 through a connecting shaft to form a revolute pair, such as 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 absorber A and shock absorber B and the ball head on the top ball head support 502 at one end of the top connecting rod 501 are coaxially connected through a connecting shaft to form a revolving pair; the ball head on the shock absorber ball head support on the rear side of the spring seat 403 in shock absorber C and shock absorber D and the ball head on the top ball head support 502 at the other end of the top connecting rod 501 are coaxially connected through a rotating shaft to form a revolving pair. Finally, three right-angled isosceles triangle shock absorbing mechanisms are formed by 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 with 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 vibration reduction device at the bottom of the airship propulsion bracket of the present invention is formed, and the bottom of the propulsion bracket is fixedly connected to the four top rods to achieve vibration isolation between the airship propulsion bracket 2 and the hull 1. The shock-absorbing 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-absorbing device adopt spherical articulated joints to ensure that the shock absorber is a two-force rod, increase the bearing capacity of the shock absorber, and make the overall shock-absorbing 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 ensure that the vibration of the propulsion system is effectively isolated 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 at the bottom of an airship propulsion support, characterized in that: It is installed between the bottom of the hull and the propulsion bracket of the airship, and consists of a bottom frame, a top rod group and a shock absorber; The bottom frame is a rectangular frame structure formed by four circumferential bottom frame connecting rods connected end to end, and the outer side surface can be tightly fitted and 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 of the two ends of each bottom frame connecting rod and the circumferential outer wall in the middle, and the bottom frame ball head supports are provided with ball head mounting holes, and the ball heads are mounted in the holes; 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 the 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 is composed of 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 walls at both ends of each top connecting rod, and ball head mounting holes are opened on the two top ball head supports, and the axes of the two ball head mounting holes are perpendicular to each other, and are commonly perpendicular to the axis of the top connecting rod, and intersect with the axis of the top connecting rod; a ball head is installed in the ball head mounting hole; the circumferential positions of the two top ball head supports at both ends of the top connecting rod correspond to each other, and the axis of the ball head mounting hole on a group of top ball head supports with corresponding positions is perpendicular to plane A; The shock absorber comprises 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 respectively opposite to the adjacent top connecting rods are coaxially connected through a connecting shaft to form a revolute pair; 16 shock absorbers are grouped into 4 groups and respectively installed between the upper and lower opposite bottom frame connecting rods and the top connecting rods; wherein, the ball heads at one end of shock absorber A and shock absorber D are respectively coaxially connected with 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 with 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 with 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 with 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 at the bottom of the airship propulsion support as claimed in 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°.

3. The vibration reduction device at the bottom of the airship propulsion support as claimed in 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 is composed of a columnar outer tube and a piston rod; the head piston of the piston rod is placed in 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 of the circular spring seat; the middle of the rear side of the spring seat and the middle of the front end 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 outer side of the piston rod is covered with a shock absorbing spring, and the end of the shock absorbing spring is connected to the front side 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, it 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 at the bottom of the airship propulsion support as claimed in claim 1, characterized in that: The bottom frame connecting rod and the top connecting rod are made of aluminum or titanium alloy material.

Images