CN102518741B - Passive low-frequency vibration isolator - Google Patents

Passive low-frequency vibration isolator Download PDF

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Publication number
CN102518741B
CN102518741B CN 201110445479 CN201110445479A CN102518741B CN 102518741 B CN102518741 B CN 102518741B CN 201110445479 CN201110445479 CN 201110445479 CN 201110445479 A CN201110445479 A CN 201110445479A CN 102518741 B CN102518741 B CN 102518741B
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CN
China
Prior art keywords
center
rod
base
frequency vibration
clamp
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CN 201110445479
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Chinese (zh)
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CN102518741A (en
Inventor
龚兴龙
彭超
宗路航
严启凡
郭朝阳
周宏�
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中国科学技术大学
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Priority to CN 201110445479 priority Critical patent/CN102518741B/en
Publication of CN102518741A publication Critical patent/CN102518741A/en
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Publication of CN102518741B publication Critical patent/CN102518741B/en

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Abstract

The invention relates to a passive low-frequency vibration isolator, which comprises an enclosed cylindrical base, wherein the top of the enclosed cylindrical base is provided with a through hole, and the inner side wall of the enclosed cylindrical base is uniformly provided and movably connected with cylinder bodies of three dampers; a center connecting rod is inserted into the through hole in the base, and the lower end of the center connecting rod is moveably connected with piston rods of the three dampers; the top of the base is uniformly provided with three mounting fixtures; the upper part of the center connecting rod is provided with a hexagonal center clamping piece which is uniformly provided and connected with one ends of three flat springs; the other ends of the three flat springs are connected with the three mounting fixtures respectively; and the top of the center connecting rod is provided with a bearing table. The passive low-frequency vibration isolator has obvious high static stiffness and low dynamic stiffness, reduces initial isolation frequency, can realize low-frequency vibration isolation and ultralow-frequency vibration isolation, has high static bearing capacity and reduces deformation; meanwhile, by optimizing the damping structure, the vibration isolator can automatically adjust damp according to working conditions to achieve effects of inhibiting resonance and resisting impact.

Description

A kind of passive low-frequency vibration isolator
Technical field
The invention belongs to the vibration control technology field of electronic instrument and electromechanical equipment, be specifically related to a kind of passive low-frequency vibration isolator.
Background technique
Electronic instrument and electromechanical equipment are in transportation and normal using process, owing to being subject to inevitably vibration-generating of internal motivation that external excitation or electromechanical equipment self running brings, this will directly affect the normal use of precision type instrument, the fatigue ruption of the material that lasting vibration also can cause and bring pollution from environmental noise.On modern naval vessels especially, the noise that brings of vibration will greatly reduce enemy's range finding from, be unfavorable for the stealthy of naval vessels.And along with the development of Precision Inspection, precision processing technology, the insulation request of environment low-frequency band vibration is more and more higher to external world.Although it is simple in structure that traditional vibrating isolation system has, stable performance, but traditional vibration isolator can not be taken into account higher quiet bearing capacity and wider vibration isolation frequency band in theory, and general centering dither has vibration isolating effect preferably, and is relatively poor to the vibration isolation ability of the vibration of low frequency.Although some active vibration isolation devices show good anti-vibration performance for low frequency vibration isolation, need the extra control system of design, and be not easy to control.The active vibration isolation device also needs to consume a large amount of energy in actual use, and this is that some fields are the most key problems on using and consume energy, so be difficult to be used widely in Practical Project.
In addition, various electronic instruments and electromechanical equipment also can be subject to the impact of percussion in the course of the work, for example when naval vessels are subject to outside directtissima or shock wave, although this impact can not directly destroy naval vessel itself, but the electronic instrument and the electromechanical equipment that are mounted in naval vessels inside will produce violent vibration and moderate finite deformation, this will directly damage the various electromechanical equipments of naval vessels inside, thereby cause naval vessels to lose mobility and defence capability.Traditional vibration isolation anti-impact vibration isolator generally presets vibration isolation anti-impact equipment energy characteristic (for example certain power consumption damping given in advance) according to typical condition.Due to polytrope and the design-calculated error of actual conditions, traditional vibration isolation anti-impact device is difficult to the service behaviour that reaches desirable.
Summary of the invention
In order to solve the contradiction of traditional vibration isolator on low frequency vibration isolation and high-bearing capacity, the invention provides a kind of novel passive low frequency vibration isolation device.
The concrete technical solution of the present invention is as follows:
A kind of passive low-frequency vibration isolator comprises the base cylindraceous of sealing, offers through hole in the middle of described base top, the uniform connecting rod that is being flexibly connected the cylinder ends of three dampers on the sidewall in base; The center connecting rod is plugged in the through hole of base, and the lower end of center connecting rod is being flexibly connected respectively the piston rod of three dampers by articulated joint; Be laid with three mounting fixtures on the circumference of described base top; Every mounting fixture comprises that cross section top offers clamp and the fixture block of V-shaped groove, and fixture block coordinates with V-shaped groove on clamp and is bolted; Connecting rod top, center is provided with hexagonal center clamping element, and the center clamping element comprises upper clamp body and lower clamp body, the corresponding uniform tapped hole that offers more than three on described upper clamp body and lower clamp body, and be threaded connection the part connection; A uniform end that is connecting three flat springs on the clamping element of center, the other end of three flat springs is connecting respectively three mounting fixtures of base top; The top of center connecting rod is provided with bearing table.
Described flat spring is long strip-board shape, and an end width is greater than the other end width, the narrow end of flat spring offers a narrow end mounting hole, the narrow end of flat spring is set on the threaded connector of connection center clamping element by narrow end mounting hole, the wide the other end of flat spring offers two wide end mounting holes, and the wide the other end of flat spring is set in respectively on the bolt of connection fixture by two wide end mounting holes.
Be provided with linear bearing in the through hole of described base top, described center connecting rod and linear bearing are slidably matched.
Described damper is the piston type damper, between the sidewall in the cylinder body connecting rod of damper and base for being articulated and connected.
Useful technique effect of the present invention is embodied in following several aspect:
1, the spring of flat spring composite structure employing is the flat spring with given shape, has the characteristic of the quiet rigidity of obvious height and low dynamic stiffness, can under the prerequisite that does not reduce quiet bearing capacity, realize even superlow frequency vibration isolating of low frequency;
2, the damper in the present invention adopts the symmetric transverse mounting type, can provide different dampings according to the operating mode of effect.Vibration hour damper provides a less damping force, and when resonance occurs in system, because the increase of vibration displacement sharply increases the damping force that damper provides, thus the vibration of the resonance peak of effectively decaying, realization is without the vibration isolation of humorous peak;
3, the present invention is vibration isolation anti-impact complex function vibration damper, has simultaneously low frequency vibration isolation and shock resistance dual functions, can effectively resist percussion when realizing low frequency vibration isolation;
4, base of the present invention is a sealed cavity, can effectively report the damper that protects inside cavity, has the dustproof and waterproof effect.
The present invention is passive passive dampers may, does not need external energy just can realize the effect of low frequency vibration isolation anti-impact.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is flat spring composite structure schematic diagram.
Fig. 4 is the force-displacement curve of flat spring composite structure.
Sequence number in upper figure: 1 flat spring, 2 linear bearings, 3 bearing tables, 4 center connecting rods, 5 center clamping elements, 6 mounting fixtures, 7 bolts, 8 base articulated joints, 9 dampers, 10 articulated joints, 11 bases.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Embodiment:
Referring to Fig. 1, a kind of passive low-frequency vibration isolator comprises the base cylindraceous 11 of sealing, and base 11 is the cavity of a sealing, can carry out effective dustproof and waterproof to the structure in cavity.Base 11 crown centers offer through hole, and linear bearing 2 is installed in through hole.Three base articulated joints 8 of uniform installation on sidewall in base 11, and three base articulated joints 8 are connecting respectively the connecting rod of the cylinder ends of three dampers 9; Between the connecting rod of damper 9 cylinder bodies and base 11 madial walls for being articulated and connected.Center connecting rod 4 is inserted in the through hole of base 11, and center connecting rod 4 is slidably matched with linear bearing 2, has guaranteed the fluency of motion; And the lower end of center connecting rod 4 is being flexibly connected respectively the piston rod of three dampers 9 by articulated joint 10; In order to realize the self-regulating function of damping, three dampers 9 are symmetrical, consist of the self-regulated damping structure, see Fig. 2.Uniform on the circumference at base 11 tops three mounting fixtures 6 are installed, every mounting fixture 6 comprises that cross section top offers clamp and the fixture block of V-shaped groove, and fixture block coordinates with V-shaped groove on clamp, and connects by bolt 7.Connecting rod 4 tops in center are set with hexagonal center clamping element 5, and center clamping element 5 comprises upper clamp body and lower clamp body, and on upper clamp body and lower clamp body, correspondence is uniform offers three tapped holes, and are threaded connection the part connection.On center clamping element 5, uniform three flat springs 1 that connecting consist of the flat spring composite structure, see Fig. 3.The flat spring composite structure has the quiet rigidity of obvious height and low dynamic stiffness characteristic, and its power displacement diagram as shown in Figure 4.The operation point of vertical vibration isolation is chosen at force-displacement curve slope minimum position, and this moment, the dynamic stiffness of flat spring composite structure was minimum.So just can reduce the initial isolation frequency of vibrating isolation system under the prerequisite that does not reduce bearing capacity, realize low frequency, even superlow frequency vibration isolating.Referring to Fig. 2, flat spring 1 is long strip-board shape, and an end width is greater than the other end width, the narrow end of flat spring 1 offers a narrow end mounting hole, the narrow end of flat spring is set on the threaded connector of connection center clamping element by narrow end mounting hole, the wide the other end of flat spring 1 offers two wide end mounting holes, and the wide the other end of flat spring 1 is set in respectively on the bolt of connection fixture by two wide end mounting holes.The top of center connecting rod 4 is equipped with bearing table 3.
During application, when the dynamic excitation masterpiece is used in the present invention, bearing table 3, center connecting rod 4, flat spring composite structure and self-regulated damping structure will vibrate together.
When vibration displacement hour, the piston movement speed of damper 9 is less, the damping force that produce this moment is less, will can not have influence on the initial isolation frequency of vibration damper, can give full play to the ability of low frequency vibration isolation.At this time the flat spring composite structure mainly plays buffering vibration, reduces the effect of transmissibility, and the energy of vibration will be consumed gradually by damper.
When passing through resonance peak or vibrate comparatively acutely, the movement velocity of damper 9 pistons will obviously be accelerated along with the increase of center connecting rod 4 displacements, the damping force that provides of damper 9 will enlarge markedly like this, can effectively consume resonance energy, thereby reduce the size of resonance peak, realize without the vibration isolation of humorous peak.
When being subject to impacting, impact force is delivered on flat spring composite structure and self-regulated damping structure by bearing table 3, center connecting rod 4.In the phase I of impacting, the damping force that the self-regulated damping structure provides is not also too large, and the impact energy of this moment will be stored in the flat spring composite structure, can effectively avoid impacting the rigid collision of bringing like this; In the second stage of impacting, the damping force that the self-regulated damping structure provides increases rapidly, and the energy that is stored in the flat spring composite structure will be consumed very soon, reaches shock proof effect.

Claims (3)

1. a passive low-frequency vibration isolator, is characterized in that: comprise the base cylindraceous of sealing, offer through hole in the middle of described base top, the uniform connecting rod that is being flexibly connected the cylinder ends of three dampers on the sidewall in base; The center connecting rod is plugged in the through hole of base, and the lower end of center connecting rod is being flexibly connected respectively the piston rod of three dampers by articulated joint; Be laid with three mounting fixtures on the circumference of described base top; Every mounting fixture comprises that cross section top offers clamp and the fixture block of V-shaped groove, and fixture block coordinates with V-shaped groove on clamp and is bolted; Connecting rod top, center is provided with hexagonal center clamping element, and the center clamping element comprises upper clamp body and lower clamp body, the corresponding uniform tapped hole that offers more than three on described upper clamp body and lower clamp body, and be threaded connection the part connection; A uniform end that is connecting three flat springs on the clamping element of center, the other end of three flat springs is connecting respectively three mounting fixtures of base top; The top of center connecting rod is provided with bearing table;
Described flat spring is long strip-board shape, and an end width is greater than the other end width, the narrow end of flat spring offers a narrow end mounting hole, the narrow end of flat spring is set on the threaded connector of connection center clamping element by narrow end mounting hole, the wide the other end of flat spring offers two wide end mounting holes, and the wide the other end of flat spring is set in respectively on the bolt of connection fixture by two wide end mounting holes.
2. a kind of passive low-frequency vibration isolator according to claim 1, it is characterized in that: be provided with linear bearing in the through hole of described base top, described center connecting rod and linear bearing are slidably matched.
3. a kind of passive low-frequency vibration isolator according to claim 1, it is characterized in that: described damper is the piston type damper, between the sidewall in the cylinder body connecting rod of damper and base for being articulated and connected.
CN 201110445479 2011-12-28 2011-12-28 Passive low-frequency vibration isolator CN102518741B (en)

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Application Number Priority Date Filing Date Title
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CN102518741B true CN102518741B (en) 2013-06-19

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104343876B (en) * 2014-10-23 2016-08-10 上海卫星工程研究所 Satellite flywheel leaf spring assembly power bump leveller
CN104632985B (en) * 2014-12-10 2016-08-31 兰州大学 passive compression adaptive damping device
CN106828987B (en) * 2016-11-16 2020-07-14 上海卫星工程研究所 Umbrella type rigidity adjusting mechanism based on leaf spring
CN106499764B (en) * 2016-11-22 2018-12-28 常州大学 A kind of rigidity mutation impact resisting vibrating damper
CN109654147B (en) * 2017-10-11 2020-08-04 清华大学 Vertical vibration isolation system
CN109505915B (en) * 2018-12-26 2020-10-30 上海大学 Ultralow frequency vibration isolator with elastic ring type structure

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* Cited by examiner, † Cited by third party
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CN101781880B (en) * 2006-12-26 2011-07-27 李凤娥 Sound absorbing-insulating barrier
CN201396393Y (en) * 2009-03-19 2010-02-03 尹学军 Spring damping vibration isolator
KR101111134B1 (en) * 2009-12-15 2012-02-24 한국생산기술연구원 Fluid damper for supporting load
CN201982575U (en) * 2011-04-19 2011-09-21 宁波大学 Variable-rigidity vibration isolator
CN202402559U (en) * 2011-12-28 2012-08-29 中国科学技术大学 Passive low frequency vibration isolator

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