CN116538233A - Horizontal multistage rigidity vibration isolation device with damping - Google Patents
Horizontal multistage rigidity vibration isolation device with damping Download PDFInfo
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- CN116538233A CN116538233A CN202310556113.9A CN202310556113A CN116538233A CN 116538233 A CN116538233 A CN 116538233A CN 202310556113 A CN202310556113 A CN 202310556113A CN 116538233 A CN116538233 A CN 116538233A
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- 238000002955 isolation Methods 0.000 title claims abstract description 33
- 238000013016 damping Methods 0.000 title claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 85
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
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- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000006096 absorbing agent Substances 0.000 abstract 3
- 230000035939 shock Effects 0.000 abstract 3
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- General Engineering & Computer Science (AREA)
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- Vibration Prevention Devices (AREA)
Abstract
The invention belongs to the technical field of vibration control, and particularly relates to a horizontal multistage stiffness vibration isolation device with damping. The positive stiffness mechanism comprises four groups of steel springs and a sliding rod internally provided with the steel springs, and two ends of the sliding rod are connected to the supporting plate. The negative stiffness mechanism comprises four groups of obliquely arranged shock absorbers, each shock absorber consists of a precompressed horizontal oblique steel spring, a piston rod, a piston sleeve and built-in viscous damping liquid, and two ends of each shock absorber are hinged to the central connecting block and the sliding block. The transmission mechanism consists of a guide rail, a sliding block, a limiting sliding block and a transmission block, wherein the guide rail and the transmission block are fixed on the bottom plate, and the sliding block and the limiting sliding block are arranged on the guide rail. The invention has good low-frequency vibration isolation performance under the condition of smaller horizontal amplitude, can obtain multistage rigidity characteristics by design, and can be applied to different vibration isolation scenes.
Description
Technical Field
The invention belongs to the technical field of vibration control, and particularly relates to a horizontal multistage stiffness vibration isolation device with damping.
Background
At present, the passive vibration isolation technology is to isolate ground vibration from an upper structure by arranging a vibration isolation layer and utilizing a vibration isolator, so that an isolated object is effectively protected from being damaged. By reducing the linear stiffness of the linear vibration isolator, the vibration isolation performance thereof can be improved. However, low stiffness results in a large static displacement of the linear vibration isolator. To overcome this disadvantage, nonlinear vibration isolators with high static stiffness and low dynamic stiffness have been proposed. A higher static stiffness means less deflection and greater load carrying capacity, while a lower dynamic stiffness means a wider vibration isolation frequency range. The stiffness characteristic of the non-linear isolator may be achieved by combining a positive stiffness with a negative stiffness to create a near zero stiffness at the operating point, which is referred to in actual engineering as a quasi-zero stiffness characteristic.
The existing quasi-zero stiffness vibration isolation device realizes ideal zero stiffness at the static balance position, and when an interference load occurs in the vibration isolation structure, larger disturbance exists, so that the stability of the system is affected.
Disclosure of Invention
The invention provides a horizontal multistage stiffness vibration isolation device with damping, which is based on the idea that positive stiffness is provided in an initial stage, and quasi-zero stiffness is provided in parallel through positive and negative stiffness mechanisms after reaching preset displacement, so as to meet the requirements of actual engineering.
The technical scheme adopted for solving the technical problems is as follows: a horizontal multistage rigidity vibration isolation device with damping comprises a bottom plate, a bearing plate, a negative rigidity mechanism and a positive rigidity mechanism, wherein:
the bottom plate is arranged on the working surface, two guide rails are arranged on the top surface of the bottom plate, the two guide rails are arranged along two longer sides of the bottom plate, a transmission block is arranged in the middle of the bottom plate, and the transmission block can linearly move along the top surface of the bottom plate;
the bearing plate is arranged above the bottom plate in parallel, four limit sliding blocks are arranged at four corners of the bottom surface of the bearing plate, and the four limit sliding blocks are all arranged along the length direction of the bearing plate;
the limit sliding blocks are in sliding connection with the guide rails, and the four limit sliding blocks can slide back and forth along the two guide rails;
a negative rigidity mechanism and a positive rigidity mechanism are arranged between the bottom plate and the bearing plate, the negative rigidity mechanism is arranged between the four limit sliding blocks, and the positive rigidity mechanism is arranged at one side of the four limit sliding blocks, which is away from the negative rigidity mechanism;
the negative stiffness mechanism comprises a central connecting block and four groups of precompressed horizontal inclined steel springs, the central connecting block is sleeved on the transmission block, the four groups of horizontal inclined steel springs are horizontally and symmetrically arranged around the central connecting block, and the four groups of horizontal inclined steel springs have the same compression stroke;
the positive stiffness mechanism comprises two baffles, four groups of steel springs and two sliding rods, the baffles are arranged on the bottom plate, the baffles are positioned on one side of the guide rail facing the external environment, one group of steel springs are respectively arranged on two sides of each baffle, the sliding rods are arranged on one side of the guide rail facing the external environment in parallel, and each sliding rod penetrates through the two groups of steel springs and one baffle;
by adjusting the stiffness ratio alpha of the steel springs in the positive stiffness mechanism and the horizontal inclined steel springs in the negative stiffness mechanism, the actual precompression coefficient of the horizontal inclined steel springs in the negative stiffness mechanismCompression stroke of precompressed horizontal tilting steel spring in negative stiffness mechanism>The relationship among the three can obtain different quasi-zero stiffness mechanical properties and realize corresponding vibration isolation effects;
the direction in which the transmission block can move is taken as X direction, and the precompression coefficient of the X-direction horizontal inclined steel spring is delta x The linear stiffness coefficient of the X-direction horizontal inclined steel spring is k 1x The linear stiffness coefficient of the X-direction steel spring is k 2x ，α、Three parameters need to satisfy equation (1):
in the formula (1),
as a further preference of the invention, four slide blocks are also included, two slide blocks are arranged on each guide rail, the slide blocks can freely slide on the guide rails, and each slide block is connected with a group of horizontal inclined steel springs.
As a further preferred aspect of the present invention, the negative stiffness mechanism further comprises a piston rod and a piston sleeve, wherein one end of the piston rod is connected with the central connecting block, and the other end of the piston rod is positioned in the piston sleeve; one end of the piston sleeve is connected with a sliding block; the horizontal inclined steel spring is sleeved on the piston sleeve and the piston rod.
As a further preference of the invention, the invention further comprises four supporting plates, wherein the supporting plates are arranged on one side of the limit sliding block, which is away from the negative stiffness mechanism, and two ends of the sliding rod are respectively connected with one supporting plate.
As a further preferable mode of the invention, the limit sliding block is detachably connected with the bearing plate.
As a further preferred aspect of the invention, the slide bar is fastened to the two support plates by means of a screw bolt.
As a further preferred feature of the invention, the piston sleeve is hinged to the slide by means of a round head bolt.
As a further preference of the invention, the distance between the two limit sliders on the same guide rail limits the compression displacement stroke of the negative stiffness mechanism, and the distance between the two limit sliders on the same guide rail can be adjusted by adjusting the installation positions of the limit sliders on the bearing plate.
As a further preferable mode of the invention, the middle part of the central connecting block is provided with a waist hole, the transmission block is positioned in the waist hole, and the transmission block can linearly move in the waist hole of the central connecting block.
As a further preferred aspect of the present invention, in the formula (1), the actual precompression coefficient of the horizontal tilt steel spring in the negative stiffness mechanismAnd compression stroke of horizontal inclined steel spring in negative stiffness mechanism +.>The calculation mode is as follows formula (2) and formula (3):
in the formula (2) and the formula (3), δ x A is the precompression coefficient of a horizontal inclined steel spring in a set negative stiffness mechanism x Is the distance between two ends of a horizontal inclined steel spring in the negative stiffness mechanism in the width direction of the bottom plate, h x Is the distance between two ends of the horizontal inclined steel spring in the length direction of the bottom plate in the negative stiffness mechanism.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the device can maintain the quasi-zero stiffness characteristic at the preset displacement by adjusting the precompression coefficient of the horizontal inclined steel spring in the negative stiffness mechanism and the stiffness ratio of the horizontal inclined steel spring and the positive stiffness mechanism steel spring in the negative stiffness mechanism, and realizes the nonlinear vibration isolation effect of high static stiffness and low dynamic stiffness.
2. The spacing between the limiting sliding blocks of the device limits the compression displacement stroke of the negative stiffness mechanism, so that the device is not invalid due to overlarge deflection of the elastic element, and the stability of the vibration isolation system is effectively improved.
3. The device is provided with viscous damping liquid in a space formed by the piston rod and the piston sleeve, when the piston rod moves in the piston sleeve, the turbulent flow of the viscous damping liquid in the piston rod can absorb part of energy, and the additional damping and the horizontal inclined steel spring cooperate to solve the problem of horizontal displacement amplification caused by single quasi-zero stiffness, so that the displacement is effectively controlled.
4. According to the invention, the distance between the transmission block and the central connecting block can be adjusted through the additional screw bolt, so that the device provides positive rigidity in the initial displacement stage of design, and after the preset displacement is reached, the positive and negative rigidity mechanisms are connected in parallel to provide quasi-zero rigidity, so that different multistage rigidity mechanical properties are obtained, and the requirements of different practical projects are met.
5. The device adopts convenient mechanical design and assembly, and reduces the requirements on processing and manufacturing.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged partial view of portion A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic diagram of an exploded construction of the present invention;
FIG. 4 is a schematic diagram showing the labeling of each parameter in the formulas (1) to (3) according to the present invention.
In the figure: the device comprises a bearing plate 1, a piston sleeve 2, a sliding block 3, a central connecting block 4, a piston rod 5, a horizontal inclined steel spring 6, a round head bolt 7, a steel spring 8, a transmission block 9, a baffle 10, a sliding rod 11, a guide rail 12, a supporting plate 13, a bolt 14, a bottom plate 15 and a limit sliding block 16.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present invention. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
Example 1
The present example provides a preferred embodiment, a horizontal multistage stiffness vibration isolation device with damping, as shown in fig. 1 to 4, comprising a bottom plate 15, a carrier plate 1, a negative stiffness mechanism, and a positive stiffness mechanism, wherein:
the bottom plate 15 is arranged on a working surface, two guide rails 12 are arranged on the top surface of the bottom plate 15, the two guide rails 12 are arranged along two longer sides of the bottom plate 15, a transmission block 9 is arranged in the middle of the bottom plate 15, and the transmission block 9 can linearly move along the top surface of the bottom plate 15. The carrying plate 1 is arranged above the bottom plate 15 in parallel, four limit sliding blocks 16 are arranged at four corners of the bottom surface of the carrying plate 1, and the four limit sliding blocks 16 are all arranged along the length direction of the carrying plate 1. The limit sliders 16 are slidably connected with the guide rails 12, and the four limit sliders 16 can slide back and forth along the two guide rails 12.
A negative rigidity mechanism and a positive rigidity mechanism are arranged between the bottom plate 15 and the bearing plate 1, the negative rigidity mechanism is arranged between the four limit sliding blocks 16, and the positive rigidity mechanism is arranged on one side of the four limit sliding blocks 16, which is away from the negative rigidity mechanism.
The embodiment further comprises four sliding blocks 3, two sliding blocks 3 are arranged on each guide rail 12, the sliding blocks 3 can freely slide on the guide rails 12, and each sliding block 3 is connected with the negative stiffness mechanism.
The negative stiffness mechanism comprises a central connecting block 4 and four groups of precompressed horizontal inclined steel springs 6, wherein the central connecting block 4 is sleeved on a transmission block 9; four groups of horizontal inclined steel springs 6 are horizontally and symmetrically arranged around the central connecting block 4, the four groups of horizontal inclined steel springs 6 have the same compression stroke, the four groups of precompressed horizontal inclined steel springs 6 have the same rigidity characteristic and compression coefficient, and device parameters can be simplified so as to realize quasi-zero rigidity characteristic. Specifically, the negative stiffness mechanism further comprises a piston rod 5 and a piston sleeve 2, one end of the piston rod 5 is connected with the central connecting block 4, and the other end of the piston rod is positioned in the piston sleeve 2; one end of the piston sleeve 2 is connected with a sliding block 3; a horizontal inclined steel spring 6 is sleeved on the piston sleeve 2 and the piston rod 5. Preferably, the piston rod 5 is hinged to the central connection block 4 by means of a bolt 14; the piston sleeve 2 is hinged with the slide block 3 through a round head bolt 7.
The positive stiffness mechanism comprises two baffles 10, four groups of steel springs 8 and two sliding rods 11, wherein the baffles 10 are arranged on a bottom plate 15, the baffles 10 are positioned on one side of a guide rail 12 facing the external environment, one group of steel springs 8 are respectively arranged on two sides of each baffle 10, the sliding rods 11 are arranged on one side of the guide rail 12 facing the external environment in parallel, and each sliding rod 11 penetrates through the two groups of steel springs 8 and one baffle 10. The present embodiment further includes four support plates 13, the support plates 13 are disposed on one side of the limit slider 16 facing away from the negative stiffness mechanism, and two ends of the slide bar 11 are respectively connected with one support plate 13.
Specifically, the four groups of steel springs 8 are all of the same rigidity coefficient and symmetrically arranged on two sides of the guide rail 12 and the limit sliding block 16, so that uneven compression movement of the bearing plate 1 after the vibration isolation object is stressed is prevented, and design parameters are simplified. The inner diameter of the steel spring 8 is larger than the inner diameter of the slide rod 11 by 1mm to 2mm, the instability of the steel spring 8 in compression can be caused by larger than 2mm, and the unnecessary friction force can be generated in the compression process by smaller than 1 mm. The left and right ends of the steel spring 8 are polished smoothly to prevent eccentric force generated after contacting the baffle plate 10 and the supporting plate 13. In addition, nylon sleeves or linear bearings can be additionally arranged at the position of the sliding rod 11 penetrating through the baffle plate 10, so that friction force during horizontal compression movement can be reduced. The slide bar 11 can be fixed on the support plates 13 at the two ends through screw bolts so as to be convenient to assemble and disassemble, and the stability of the positive stiffness mechanism steel spring 8 during compression is maintained.
When the bottom plate 15 is displaced, the transmission block 9 and the baffle plate 10 move along with the movement of the bottom plate 15, the negative stiffness mechanism moves along with the movement of the transmission block 9, and the positive stiffness mechanism moves along with the movement of the baffle plate 10, so that the bearing plate 1 provided with the four limit sliding blocks 16 is driven to move along the two guide rails 12.
The design of the quasi-zero stiffness characteristic of the vibration isolation device mainly depends on three parameters, the stiffness ratio of the positive stiffness mechanism steel spring 8 to the negative stiffness mechanism horizontal inclined steel spring 6, the precompression coefficient of the negative stiffness mechanism horizontal inclined steel spring 6 and the vertical compression stroke of the negative stiffness mechanism horizontal inclined steel spring 6, different quasi-zero stiffness mechanical properties can be obtained by adjusting specific relations among the three parameters, and the multifunctional vibration isolation effect is realized.
The limiting slide block 16 in this embodiment is detachably connected to the carrier plate 1. The distance between the two limit sliding blocks 16 on the same guide rail 12 limits the compression displacement stroke of the negative stiffness mechanism, and the adjustment of the distance between the two limit sliding blocks 16 on the same guide rail 12 can be changed by adjusting the installation position of the positioning bolt connected with the bearing plate 1. Preferably, the space between the two limit sliders 24 on the guide rail 23 is adjusted by adjusting the installation position of the limit slider 16 on the bearing plate 1; specifically, the installation and the adjustment of the installation position between the limit sliding block 24 and the bearing plate 1 can be realized by arranging the positioning bolts and a plurality of installation holes.
In this embodiment, a viscous damping fluid is provided in the space formed between the piston rod 5 and the piston sleeve 2. When the piston rod 5 moves in the piston sleeve 2, the turbulent flow of the internal viscous damping liquid can absorb part of energy, and the additional damping and the horizontal inclined steel spring 6 cooperate to realize the horizontal displacement amplification caused by single quasi-zero stiffness, so that the displacement is effectively controlled.
In this embodiment, the middle part of the central connecting block 4 is provided with a waist hole, the transmission block 9 is positioned in the waist hole, the transmission block 9 can linearly move in the waist hole of the central connecting block 4, and the vibration isolation device can obtain different multistage rigidity characteristics by adjusting the initial position of the transmission block 9 in the waist hole of the central connecting block 4 so as to be applied to different vibration isolation scenes. Preferably, the additional screw bolt adjusts the initial position of the transmission block 9 in the waist hole of the central connection block 4.
When the bottom plate 15 is displaced, the transmission block 9 and the baffle plate 10 move along with the movement of the bottom plate 15, the negative stiffness mechanism moves along with the movement of the transmission block 9, and the positive stiffness mechanism moves along with the movement of the baffle plate 10, so that the bearing plate 1 provided with the four limit sliding blocks 16 is driven to move along the two guide rails 12.
In the embodiment, the positive stiffness mechanism and the negative stiffness mechanism are connected in parallel through a transmission mechanism, and the transmission mechanism consists of a guide rail 12, a sliding block 3, a limit sliding block 16 and a transmission block 9. After the vibration isolation device is installed, under the action of horizontal vibration generated by ground movement or isolation objects, the positive stiffness mechanism works alone at the initial displacement stage of design to provide positive stiffness, and the negative stiffness mechanism and the positive stiffness mechanism are connected through the transmission mechanism to generate horizontal compression movement to provide quasi-zero stiffness simultaneously after reaching the preset displacement, so that the system integrally presents multistage stiffness characteristics. The position of the transmission block 9 in the waist hole of the central connecting block 4 is adjusted by adding screw bolts, so that different multi-stage rigidity mechanical properties can be obtained to meet the requirements of different practical projects.
The present embodiment adjusts the stiffness ratio α of the steel spring 8 in the positive stiffness mechanism and the horizontal tilt steel spring 6 in the negative stiffness mechanism, the actual precompression coefficient of the horizontal tilt steel spring 6 in the negative stiffness mechanismCompression stroke of horizontal inclined steel spring 6 in negative stiffness mechanism>The relationship among the three can obtain different quasi-zero stiffness mechanical properties, and the vibration isolation effect is realized as follows:
as shown in FIG. 4, the precompression coefficient of the horizontal tilt steel spring 6 in the X direction is delta, with the direction in which the transmission block 9 can move x The linear stiffness coefficient of the X-direction horizontal inclined steel spring 6 is k 1x The linear stiffness coefficient of the X-direction steel spring 8 is k 2x ，α、Three parameters need to satisfy equation (1):
in the formula (1),the actual precompression coefficient of the horizontal tilting steel spring 6 in the negative stiffness mechanism +.>And compression stroke of the horizontal tilting steel spring 6 in the negative stiffness mechanism +.>The calculation mode is shown as the following formula (2) and formula (d)3)：
In the formula (2) and the formula (3), δ x For the pre-compression coefficient, a, of the horizontal inclined steel spring 6 in the set negative stiffness mechanism x Is the distance between two ends of a horizontal inclined steel spring 6 in the width direction of the bottom plate in the negative stiffness mechanism, h x Is the distance between two ends of the horizontal inclined steel spring 6 in the length direction of the bottom plate in the negative stiffness mechanism.
In the course of the adjustment, the parameters known in advance are delta x 、a、k 1x 、k 2x According to k 1x 、k 2x Alpha can be obtained by the method,substituting the obtained alpha into the formula (1) to obtain the required h Is required to The value and then the position of the slider 3 on the guide rail 12, h x ＝h Is required to And obtaining the optimal assembly state of the vibration damper under the current working condition.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as referred to in this application means that each exists alone or both.
As used herein, "connected" means either a direct connection between elements or an indirect connection between elements via other elements.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. A horizontal multistage rigidity vibration isolation device with damping is characterized in that: including bottom plate (15), loading board (1), negative rigidity mechanism, positive rigidity mechanism, wherein:
the bottom plate (15) is arranged on a working surface, two guide rails (12) are arranged on the top surface of the bottom plate (15), the two guide rails (12) are arranged along two longer sides of the bottom plate (15), a transmission block (9) is arranged in the middle of the bottom plate (15), and the transmission block (9) can linearly move along the top surface of the bottom plate (15);
the bearing plate (1) is arranged above the bottom plate (15) in parallel, four limit sliding blocks (16) are arranged at four corners of the bottom surface of the bearing plate (1), and the four limit sliding blocks (16) are all arranged along the length direction of the bearing plate (1);
the limit sliding blocks (16) are in sliding connection with the guide rails (12), and the four limit sliding blocks (16) can slide back and forth along the two guide rails (12);
a negative rigidity mechanism and a positive rigidity mechanism are arranged between the bottom plate (15) and the bearing plate (1), the negative rigidity mechanism is arranged between the four limit sliding blocks (16), and the positive rigidity mechanism is arranged at one side of the four limit sliding blocks (16) deviating from the negative rigidity mechanism;
the negative stiffness mechanism comprises a central connecting block (4) and four groups of precompressed horizontal inclined steel springs (6), the central connecting block (4) is sleeved on a transmission block (9), the four groups of horizontal inclined steel springs (6) are horizontally and symmetrically arranged around the central connecting block (4), and the four groups of horizontal inclined steel springs (6) have the same compression stroke;
the positive stiffness mechanism comprises two baffles (10), four groups of steel springs (8) and two sliding rods (11), wherein the baffles (10) are arranged on a bottom plate (15), the baffles (10) are positioned on one side of a guide rail (12) facing the external environment, one group of steel springs (8) are respectively arranged on two sides of each baffle (10), the sliding rods (11) are arranged on one side of the guide rail (12) facing the external environment in parallel, and each sliding rod (11) penetrates through the two groups of steel springs (8) and one baffle (10);
by adjusting the stiffness ratio alpha of the steel spring (8) in the positive stiffness mechanism and the horizontal inclined steel spring (6) in the negative stiffness mechanism, the actual precompression coefficient of the horizontal inclined steel spring (6) in the negative stiffness mechanismCompression stroke of precompressed horizontal tilting steel spring (6) in negative stiffness mechanism>The relationship among the three can obtain different quasi-zero stiffness mechanical properties and realize corresponding vibration isolation effects;
the direction in which the transmission block (9) can move is taken as X direction, and the precompression coefficient of the X direction horizontal inclined steel spring (6) is delta x The linear stiffness coefficient of the X-direction horizontal inclined steel spring (6) is k 1x The linear stiffness coefficient of the X-direction steel spring (8) is k 2x ，α、 Three parameters need to satisfy equation (1):
in the formula (1),
2. a damped horizontal multistage stiffness vibration isolator according to claim 1, wherein: the novel steel rail car further comprises four sliding blocks (3), two sliding blocks (3) are mounted on each guide rail (12), the sliding blocks (3) can freely slide on the guide rails (12), and each sliding block (3) is connected with a group of horizontal inclined steel springs (6).
3. A damped horizontal multistage stiffness vibration isolator according to claim 2, wherein: the negative stiffness mechanism further comprises a piston rod (5) and a piston sleeve (2), one end of the piston rod (5) is connected with the central connecting block (4), and the other end of the piston rod is positioned in the piston sleeve (2); one end of the piston sleeve (2) is connected with a sliding block (3); the horizontal inclined steel spring (6) is sleeved on the piston sleeve (2) and the piston rod (5).
4. A damped horizontal multistage stiffness vibration isolator according to claim 3, wherein: the device further comprises four supporting plates (13), wherein the supporting plates (13) are arranged on one side, deviating from the negative stiffness mechanism, of the limiting sliding block (16), and two ends of the sliding rod (11) are respectively connected with one supporting plate (13).
5. The damping-attached horizontal multistage stiffness vibration isolation device according to claim 4, wherein: the limit sliding block (16) is detachably connected with the bearing plate (1).
6. The damping-attached horizontal multistage stiffness vibration isolation device according to claim 4, wherein: the slide bar (11) is fixed on the two support plates (13) through screw bolts.
7. The damping-attached horizontal multistage stiffness vibration isolation device according to claim 4, wherein: the piston sleeve (2) is hinged with the sliding block (3) through a round head bolt (7).
8. The damping-attached horizontal multistage stiffness vibration isolation device according to claim 5, wherein: the compression displacement travel of the negative stiffness mechanism is limited by the distance between the two limit sliding blocks (16) on the same guide rail (12), and the adjustment of the distance between the two limit sliding blocks (16) on the same guide rail (12) can be realized by adjusting the installation position of the limit sliding blocks (16) on the bearing plate (1).
9. The damping-attached horizontal multistage stiffness vibration isolation device according to claim 4, wherein: the waist hole is formed in the middle of the central connecting block (4), the transmission block (9) is positioned in the waist hole, and the transmission block (9) can linearly move in the waist hole of the central connecting block (4).
10. A damped horizontal multistage stiffness vibration isolator according to claim 1, wherein: in the formula (1), the actual precompression coefficient of the horizontal inclined steel spring (6) in the negative stiffness mechanismAnd compression stroke of a horizontal tilting steel spring (6) in a negative stiffness mechanism>The calculation mode is as follows formula (2) and formula (3):
in the formula (2) and the formula (3), δ x For the pre-compression coefficient, a, of a horizontal inclined steel spring (6) in a set negative stiffness mechanism x Is the distance h between two ends of a horizontal inclined steel spring (6) in the width direction of a bottom plate (15) in the negative stiffness mechanism x Is the distance between two ends of the horizontal inclined steel spring (6) in the length direction of the bottom plate (15) in the negative stiffness mechanism.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116905688A (en) * | 2023-09-08 | 2023-10-20 | 北京工业大学 | Multimode frequency independent additional shock isolation system for existing shock isolation structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116905688A (en) * | 2023-09-08 | 2023-10-20 | 北京工业大学 | Multimode frequency independent additional shock isolation system for existing shock isolation structure |
| CN116905688B (en) * | 2023-09-08 | 2023-12-01 | 北京工业大学 | Multimode frequency independent additional shock isolation system for existing shock isolation structure |
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