Quasi-zero stiffness three-dimensional vibration isolation support

Abstract

The utility model provides a quasi-zero stiffness three-dimensional vibration isolation support. The quasi-zero stiffness three-dimensional vibration isolation support comprises an upper connecting plate; a lower connecting plate; the vertical vibration isolation system is arranged between the upper connecting plate and the lower connecting plate; the quasi-zero stiffness system comprises a plurality of inner connecting plates and a plurality of outer connecting plates, the plurality of inner connecting plates are connected end to end to form a first polygonal sleeve, the plurality of outer connecting plates are connected end to end to form a second polygonal sleeve, and the first polygonal sleeve is fixedly arranged on the vertical vibration isolation system in a sleeving manner; the first polygonal sleeve is sleeved with the second polygonal sleeve, the second polygonal sleeve is fixed to the lower connecting plate, the multiple inner connecting plates correspond to the multiple outer connecting plates in a one-to-one mode, and transverse vibration isolation assemblies are arranged between the inner connecting plates and the outer connecting plates which correspond to each other. The device can be applied to a roof parking apron and is used for reducing the problem of vibration of a main body structure caused by take-off and landing of a roof aircraft and improving the vibration comfort degree of the structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration isolation, and in particular relates to a quasi-zero stiffness three-dimensional vibration isolation support. Background Art

[0002] Electric Vertical Takeoff and Landing Vehicles (eVTOL) have attracted much attention due to their significant efficiency advantages. As a new generation of revolutionary aviation aircraft, eVTOL is a combination of new concepts, new energy, new materials, and new technologies. It is the mainstream solution for the future urban air traffic market. Aircraft related to the low-altitude economy and its supporting new infrastructure have triggered a wave of research and development worldwide, becoming a new track for international aviation science and technology innovation competition. As the most important supporting infrastructure for electric vertical takeoff and landing aircraft, the apron urgently needs to further improve its construction efficiency and comfort performance to adapt to the high-quality development of the low-altitude economy.

[0003] Currently, rooftop helipads in China are primarily traditional helicopter landing pads, constructed primarily using cast-in-place concrete structures. These disadvantages include long construction times, environmental pollution during construction, and the inability to dismantle and rebuild or upgrade. Traditional concrete rooftop helipads are typically cast-in-place and connected to the main structure. Vibrations from helicopter takeoffs and landings on the rooftop are directly transmitted to the main structure, severely impacting user comfort and causing discomfort to personnel. This can also potentially disrupt the proper functioning of high-precision hospital equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a quasi-zero stiffness three-dimensional vibration isolation bearing, which can be applied to a rooftop helipad to reduce the vibration problem of the main structure caused by the take-off and landing of rooftop aircraft and improve the vibration comfort of the structure.

[0005] The utility model is realized through the following technical solutions:

[0006] A quasi-zero stiffness three-dimensional vibration isolation support, comprising:

[0007] Upper connecting plate;

[0008] Lower connecting plate;

[0009] A vertical vibration isolation system is provided between the upper connecting plate and the lower connecting plate;

[0010] Quasi-zero stiffness system, the quasi-zero stiffness system includes multiple inner connecting plates and multiple outer connecting plates, the multiple inner connecting plates are connected end to end to form a first polygonal sleeve, the multiple outer connecting plates are connected end to end to form a second polygonal sleeve, the first polygonal sleeve is fixed on the vertical vibration isolation system, the second polygonal sleeve is mounted on the outside of the first polygonal sleeve and fixed on the lower connecting plate, the multiple inner connecting plates correspond one to one to the multiple outer connecting plates, and a transverse vibration isolation assembly is provided between the corresponding inner connecting plates and the outer connecting plates.

[0011] Furthermore, the transverse vibration isolation assembly comprises a transverse coil spring and two mounting plates respectively arranged at both ends of the transverse coil spring, and the two mounting plates are respectively detachably connected to the corresponding inner connecting plate and outer connecting plate.

[0012] Furthermore, the vertical vibration isolation system includes a rubber pad, a middle connecting plate and a plurality of load-bearing coil springs. The top of the rubber pad is installed on the bottom of the upper connecting plate, and the bottom of the rubber pad is connected to the middle connecting plate. The plurality of load-bearing coil springs are arranged between the middle connecting plate and the lower connecting plate. The middle connecting plate is a polygonal plate, and the plurality of side edges of the middle connecting plate correspond one-to-one to the plurality of inner connecting plates. The plurality of inner connecting plates are respectively arranged on the sides of the corresponding middle connecting plate.

[0013] Furthermore, the number of the load-bearing coil springs is set to four, and the four load-bearing coil springs are arranged in a rectangular shape.

[0014] Furthermore, the upper connecting plate and the rubber pad are connected by bolts.

[0015] Furthermore, the bottom plate of the upper connecting plate and the top of the lower connecting plate are both provided with grooves for placing the vertical vibration isolation system.

[0016] Furthermore, mounting holes are provided at the four corners of the upper connecting plate and the lower connecting plate.

[0017] Furthermore, the number of the inner connecting plates and the number of the outer connecting plates are both set to four.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The vertical vibration isolation system has the functions of bearing and vibration reduction, which can effectively adjust the vertical modal frequency of the structure, increase the vertical damping of the structure, and play a good vibration reduction effect. The quasi-zero stiffness system can provide negative stiffness corresponding to the direction of movement, further reducing the apron modal frequency, playing a good role in motion buffering and vibration reduction. Together with the vertical vibration isolation system, it plays a comprehensive vibration reduction role. The quasi-zero stiffness system can also reduce the horizontal movement of the structure and enhance the lateral resistance of the support.

[0020] (2) The upper connecting plate and the lower connecting plate are used to connect to the main structure and the apron respectively, to achieve rapid assembly construction;

[0021] (3) The utility model can be applied to rooftop helipads, which can effectively reduce the vibration problem of the main structure caused by the take-off and landing of rooftop aircraft and improve the vibration comfort of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic cross-section of the quasi-zero stiffness three-dimensional vibration isolation support of the utility model;

[0023] Figure 2 This is a bottom view of the quasi-zero stiffness three-dimensional vibration isolation support of the utility model;

[0024] Figure 3 This is a top view of the quasi-zero stiffness three-dimensional vibration isolation support of the utility model.

[0025] In the figure, 1-upper connecting plate, 2-lower connecting plate, 3-inner connecting plate, 4-outer connecting plate, 5-transverse coil spring, 6-rubber pad, 7-middle connecting plate, 8-load-bearing coil spring, 9-groove, 10-mounting hole, 11-mounting plate. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this utility model, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0031] See also Figure 1 、 Figure 2 and Figure 3 , Figure 1 This is a cross-sectional diagram of the quasi-zero stiffness three-dimensional vibration isolation support of the utility model. Figure 2 This is the bottom view of the quasi-zero stiffness three-dimensional vibration isolation support of the utility model. Figure 3 This is a top view of the quasi-zero stiffness three-dimensional vibration isolation support of the utility model. A quasi-zero stiffness three-dimensional vibration isolation support comprises an upper connecting plate 1, a lower connecting plate 2, a vertical vibration isolation system, and a quasi-zero stiffness system. The vertical vibration isolation system is disposed between the upper connecting plate 1 and the lower connecting plate 2, and the quasi-zero stiffness system is connected to the vertical vibration isolation system and the lower connecting plate 2, respectively.

[0032] The upper and lower connecting plates 1 and 2 are used to connect to the main structure and the apron, respectively, installing the quasi-zero-stiffness three-dimensional vibration isolation bearing of the present invention between the main structure and the apron. To facilitate installation, in one embodiment, mounting holes 10 are provided at the four corners of the upper and lower connecting plates 1 and 2. These mounting holes 10 allow the upper and lower connecting plates 1 and 2 to be bolted to the main structure and the apron, respectively, enabling rapid assembly and construction, improving construction efficiency.

[0033] When subjected to the impact vibration caused by the takeoff and landing of aircraft on the rooftop helipad, the vibration is transmitted to the quasi-zero stiffness three-dimensional vibration isolation support of the utility model through the helipad, and then the energy is absorbed by the vertical vibration isolation system to reduce the vibration. At the same time, the quasi-zero stiffness system can provide negative stiffness, reduce the vertical modal frequency of the structure, dissipate the structural vibration energy more fully, and ensure the vibration comfort of the main structure, thereby effectively reducing the vibration problem of the main structure caused by the takeoff and landing of aircraft on the roof and improving the vibration comfort of the structure.

[0034] Specifically, the vertical vibration isolation system performs both load-bearing and vibration-damping functions, effectively adjusting the vertical modal frequency of the structure, increasing the structure's vertical damping, and achieving excellent vibration reduction. In one embodiment, the vertical vibration isolation system includes a rubber pad 6, a middle connecting plate 7, and multiple load-bearing coil springs 8. The top of the rubber pad 6 is mounted on the bottom of the upper connecting plate 1, and the bottom of the rubber pad 6 is connected to the middle connecting plate 7. The multiple load-bearing coil springs 8 are disposed between the middle connecting plate 7 and the lower connecting plate 2. The middle connecting plate 7 is a polygonal plate, and its multiple side edges correspond one-to-one with the multiple inner connecting plates 3, which are respectively disposed on the sides of the corresponding middle connecting plate 7. The multiple load-bearing coil springs 8 significantly reduce the overall vertical stiffness of the support. The rubber pad 6 not only further reduces the vertical stiffness of the support, but also absorbs impact vibration energy through its energy-damping function. In one embodiment, the number of load-bearing coil springs 8 is set to four, and the four load-bearing coil springs 8 are arranged in a rectangular shape. In one embodiment, the rubber pad 6 is a high-damping, thick-walled rubber pad 6. High damping effectively absorbs vibration energy. Thick rubber pad 6, which has good pressure-bearing and cushioning capabilities, can withstand greater loads and impacts. In one embodiment, the upper connecting plate 1 and rubber pad 6 are connected by bolts. This arrangement facilitates installation and removal of the rubber pad 6 from the upper connecting plate 1.

[0035] In one embodiment, the bottom plate of the upper connecting plate 1 and the top of the lower connecting plate 2 are both provided with grooves 9 for placing the vertical vibration isolation system. The grooves 9 limit the vertical vibration isolation system, ensuring that the vertical vibration isolation system is accurately placed and prevents lateral displacement.

[0036] The quasi-zero stiffness system can provide negative stiffness in the corresponding direction of motion, further reducing the apron modal frequency, playing an excellent role in motion buffering and vibration reduction. Together with the vertical vibration isolation system, it exerts a comprehensive vibration reduction effect. The quasi-zero stiffness system can also reduce the horizontal movement of the structure and enhance the lateral resistance of the support. The quasi-zero stiffness system includes multiple inner connecting plates 3 and multiple outer connecting plates 4. The multiple inner connecting plates 3 are connected end to end to form a first polygonal sleeve, and the multiple outer connecting plates 4 are connected end to end to form a second polygonal sleeve. The first polygonal sleeve is fixed on the vertical vibration isolation system, and the second polygonal sleeve is mounted on the outside of the first polygonal sleeve and fixed on the lower connecting plate 2. The multiple inner connecting plates 3 correspond to the multiple outer connecting plates 4 one by one, and a lateral vibration isolation assembly is provided between the corresponding inner connecting plates 3 and outer connecting plates 4. A polygonal annular groove 9 is formed by the first polygonal sleeve and the second polygonal sleeve. Multiple lateral vibration isolation assemblies are respectively arranged on multiple sides of the polygonal annular groove 9. The horizontal vibration isolation of the lateral vibration isolation assembly is utilized to provide negative stiffness in the corresponding direction of motion. In one embodiment, the transverse vibration isolation assembly comprises a transverse coil spring 5 and two mounting plates 11 disposed at either end of the transverse coil spring 5. The two mounting plates 11 are removably connected to the corresponding inner connecting plate 3 and outer connecting plate 4. The transverse coil spring 5 is used to absorb vibration energy originating in the transverse (horizontal) direction. The mounting plates 11 facilitate the installation of the transverse coil spring between the corresponding inner connecting plate 3 and outer connecting plate 4. In one embodiment, the number of both the inner connecting plate 3 and the outer connecting plate 4 is set to four.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A quasi-zero stiffness three-dimensional vibration isolation support, characterized in that: include: Upper connecting plate; Lower connecting plate; A vertical vibration isolation system, the vertical vibration isolation system being arranged between the upper connecting plate and the lower connecting plate; A quasi-zero stiffness system includes multiple inner connecting plates and multiple outer connecting plates. The multiple inner connecting plates are connected end to end to form a first polygonal sleeve. The multiple outer connecting plates are connected end to end to form a second polygonal sleeve. The first polygonal sleeve is sleeved and fixed on the vertical vibration isolation system. The second polygonal sleeve is sleeved on the outside of the first polygonal sleeve and fixed on the lower connecting plate. The multiple inner connecting plates correspond one-to-one to the multiple outer connecting plates. A transverse vibration isolation assembly is provided between the corresponding inner connecting plates and outer connecting plates.

2. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 1, characterized in that: The transverse vibration isolation component comprises a transverse coil spring and two mounting plates respectively arranged at both ends of the transverse coil spring, and the two mounting plates are respectively detachably connected to the corresponding inner connecting plate and outer connecting plate.

3. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 1, characterized in that: The vertical vibration isolation system includes a rubber pad, a middle connecting plate and a plurality of load-bearing coil springs. The top of the rubber pad is installed on the bottom of the upper connecting plate, and the bottom of the rubber pad is connected to the middle connecting plate. The plurality of load-bearing coil springs are arranged between the middle connecting plate and the lower connecting plate. The middle connecting plate is a polygonal plate, and the plurality of side edges of the middle connecting plate correspond one-to-one to the plurality of inner connecting plates. The plurality of inner connecting plates are respectively arranged on the side edges of the corresponding middle connecting plate.

4. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 3, characterized in that: The number of the load-bearing coil springs is set to four, and the four load-bearing coil springs are arranged in a rectangular shape.

5. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 3, characterized in that: The upper connecting plate and the rubber pad are connected by bolts.

6. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 1, characterized in that: The bottom plate of the upper connecting plate and the top of the lower connecting plate are both provided with grooves for placing the vertical vibration isolation system.

7. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 1, characterized in that: The four corners of the upper connecting plate and the lower connecting plate are provided with mounting holes.

8. The quasi-zero stiffness three-dimensional vibration isolation support according to claim 1, characterized in that: The number of the inner connecting plates and the number of the outer connecting plates are both set to four.

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