CN85100564A - Isolation damper without resonant peaks - Google Patents
Isolation damper without resonant peaks Download PDFInfo
- Publication number
- CN85100564A CN85100564A CN 85100564 CN85100564A CN85100564A CN 85100564 A CN85100564 A CN 85100564A CN 85100564 CN85100564 CN 85100564 CN 85100564 A CN85100564 A CN 85100564A CN 85100564 A CN85100564 A CN 85100564A
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- spring
- assembly
- arc
- spring leaf
- attachment bolt
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- Vibration Dampers (AREA)
Abstract
Isolation damper without resonant peaks belongs to the technical field of electronic instrument or equipment being carried out the vibratory impulse protection.
The present invention can be by the anti-vibration and shock requirement with three with the attachment bolt assembly, regulate the partiting spring polarization assembly of its elasticity, damping characteristic respectively, elasticity, the damping characteristic that waist drum shape arc spring damping buffering spring assembly, horizontal rigidity are regulated spring assembly is combined as desirable change rigidity, becomes damping characteristic.This not only can overcome the shortcoming of existing vibration isolator, in the time of can also being implemented in three coordinate axial directions and carrying out swept frequency excitation, (for example no resonance peak in 0～55000HZ) absorbs in less deformation space, stores bigger impact energy, takes into account two kinds of functions of vibration isolation and buffering at its full range band.
Description
The present invention is a kind of isolation damper that does not have resonance peak.The anti-vibration and shock technical field that belongs to electronic instrument and electromechanical equipment.
In order to improve electronic instrument and electromechanical equipment, adopt vibration isolator protection usually at high vibration, towards the reliability of propping up under the environment condition.Vibration isolator should be able to satisfy two kinds of functions of vibration isolation and buffering.
Existing vibration isolator all adopts composite elastic-damping structure form, promptly adapts to various requirement by different elasticity-damping structures respectively.And when environmental conditions requires abominable (as the temperature difference in-70 ℃～150 ℃ scopes), usually adopt the full-metallic vibration isolator, for example: ⅰ, the wire netting damping shock absorber (JWZ series) that China Liaoyang vibration damper factory makes, adopt cylindrical helical spring as elastic element, Stainless Steel Wire net post and gauze pad etc. as structural members such as damping member and shell, base plate, blocks, and become whole with the rivet riveting.ⅱ, the product descritption of Britain CMT WELLS KELO company has been announced the stiffness and damping controllable type full-metallic vibration isolators such as three-dimensional of the said firm.The structural feature of this vibration isolator is to have adopted main partiting spring polarization assembly, buffer limit spring assembly, radially structural member such as composite elastic-damper assembly such as damping device and additional damping device assembly and shell, connection cannulated sleeve.
Above-mentioned two kinds of full-metallic vibration isolators, all exist: 1. when actual load and nominal load are not quite identical, its Vertical direction equipoise is unadjustable, cause the upper and lower free deformation space between buffering stop block and the shell asymmetric, when resonance occurring, easily produce and bounce phenomenon, it is big that noise becomes, and equipment easily is hit.2. all there is resonance phenomena in both, and the transmissibility η during resonance
Max=3～5, be about to dynamic excitation and amplified 3～5 times.3. little (damping ratio D is all between 0.10～0.13, and the ability that absorbs impact energy is relatively poor, and rigid collision takes place easily, causes " buffer " to become " adding towards device " in damping.4. the ratio of horizontal rigidity and vertical stiffness is difficult to regulate on demand, JWZ type especially, and horizontal characteristic is relatively poor.5. said two products all can not be taken into account two kinds of functions of vibration isolation and buffering, and the JWZ type is then poorer.
The objective of the invention is to design a kind of isolation damper at above-mentioned shortcoming, when this device was worked in the resonance region, it is infinitely great that its damping ratio is tending towards, the transmissibility perseverance is 1, and when entering the work of vibration damping district, damping ratio reduces gradually and goes to zero, and makes entire work process be no resonance peak state.Improve the ability that absorbs impact energy simultaneously, and make its level and vertical stiffness require to regulate according to reality, and when actual load and nominal load are inconsistent, can regulate Vertical direction equipoise, free deformation space symmetry when making upper and lower motion, reach and take into account two kinds of functions of vibration isolation and buffering, and then reach the noise that elimination is bounced phenomenon and caused therefrom.
Technical solution of the present invention is: make isolation damper have the assembly of three elasticity-damping characteristics, can regulate (being that waist drum shape arc damping buffering spring assembly, horizontal rigidity are regulated the spring assembly partiting spring polarization assembly adjustable with vertical equipoise) separately by the requirement of anti-vibration and shock technology respectively, with three's unification whole of system's proof resilience-damping characteristic with the attachment bolt assembly then, and be installed in shell and base plate interior, in aggregates with rivet.
Fig. 1 represents, arc damping buffering spring assembly is the waist drum shape structure that the arc spring leaf (8) of R is formed by some along spacer ring (10) circumference uniform distribution, radius.The upper and lower end of arc spring leaf all is equipped with the upper and lower ring (6) of interband spacer ring (10), and (14), its lower end are connected with following ring (14) and install cushion cover (15) additional.Cushion cover is one to have the sleeve of thin-walled flange.
Arc spring leaf can be made into the rectangular cross-section, also can be made into circular cross-section.The material, radius of arc, radical, sectional shape and the physical dimension that change arc spring leaf can obtain needed elasticity-damping characteristic.
Because the arc spring leaf assembly is the waist drum shape, so the radial dimension maximum at central plane 0～0 place of the arc radius R of this reed, the two ends minimum.When cap (9) the upper and lower motion of portion within it (as shown in Figure 2), if displacement amount is Z
O, the radial force F that produces between this assembly and the cap then
X, vertical force F
ZAnd F
XWith F
ZMake a concerted effort-frictional force F when normal direction positive pressure N and catenary motion
μ, be Z
OFunction, and with Z
OIncrease and increase.Since this assembly can be between shell (7) and base plate (12) along continuous straight runs (radially) slip, and because of arc spring leaf along the spacer ring circumference uniform distribution, horizontal force F
XTo make a concerted effort be zero, therefore, the horizontal rigidity of this assembly is zero.Total vertical stiffness and vertical friction damping force F
μWith Z
OIncrease and be non-linear increase.As initial stiction F
μGreater than extraneous swept frequency excitation power F
pAnd (F during less than the dynamic load value allowable of protected equipment
p＜F
μ＜F
d), there is not relative movement (Z between cap (9) and the arc damping buffering spring assembly
O=0).At this moment, protected equipment, isolation damper and basic three are in puppet and rigidly connect state, and extraneous basic excitation power (or displacement) is passed to equipment by 1: 1 ground of isolation damper, make transmissibility η ≡ 1.When equipment quality is M, the swept frequency excitation frequency is f
p, when amplitude is A, exciting force F
p=AM(2 π f
p)
2Therefore, suitably determine the natural frequency f of vibrating isolation system
O(1～10HZ) and control assembling magnitude of interference (δ=0.005～0.3) between arc damping buffering spring assembly and the cap (9), can make F
p＜F
μ＜(F
d) and the realization Vertical direction does not have the transmission characteristics of resonance peak.
Partiting spring polarization assembly is made up of vibration isolation spring (17) and adjusting nut (3).The vibration isolation spring can be made into cylindrical spiral spring, equifrequency spring or unstability spring.Its lower end is enclosed within on the round boss of base plate, the unlikely slippage of substantially horizontal, upper end and the mutual socket in attachment bolt bottom, when making equipment be in the equipoise, trough rim 0 groove of cap is concordant with the shell upper-end surface, then lower protruding edge is on the center of arc plane 0～0 of arc spring assembly all the time, has realized that the equipoise is adjustable.
Structural parameter such as geometrical shape (as cylindricality, turriform, unstability type etc.), physical dimension and the spiral spring diameter of change vibration isolation spring, pitch, the number of turns can obtain needed spring rate.Its vertical stiffness has been determined the vertical natural frequency f of vibrating isolation system
OThe compensation level rigidity value of its horizontal rigidity value and horizontal rigidity adjusting spring has been formed the aggregate level rigidity of system.
On adjusting nut, the position limit pin that is stuck in the cap groove is housed, when regulating vertical equipoise, can prevent adjusting nut with attachment bolt with moving.Position limit pin (5) is lived with rivet (4) riveting.
Horizontal rigidity is regulated spring assembly and is regulated spring (19) by horizontal rigidity, and sliding plug (20) and sliding sleeve (18) are formed.The upper end and the attachment bolt of spring rigidly connect, and the lower end is furnished with the sliding plug that rigidly connects with horizontal rigidity adjusting spring.Sliding plug can be in sliding sleeve upper and lower moving freely, so the vertical stiffness of this assembly is zero.Sliding sleeve lower end and base plate rigid joint.
Change the steel wire diameter d that regulates spring, length L can obtain needed compensation level rigidity value.The aggregate level rigidity of the horizontal rigidity construction system of compensation level rigidity and partiting spring polarization assembly.When requiring horizontal rigidity when unequal, then can adopt the wire spring of rectangular cross-section along X and Y direction in horizontal plane, its width and thickness are determined according to need.Horizontal rigidity is adjustable thus.
When the rotary freedom that do not need restraint around the axle (Z axle) that hangs down, traveller and sliding sleeve matching surface all adopt the circular section, otherwise adopt the rectangular cross-section.
According to the condition of environmental test and the substantially horizontal natural frequency (f of the definite vibrating isolation system of requirement
O'=1～10HZ) and arc spring assembly and shell and base plate between the assembling magnitude of interference, make the friction damping force F on the substantially horizontal
μ' greater than exciting force F
p' and less than dynamic load value (F allowable
d'), equipment, vibration isolator and basis were in puppet in the horizontal direction and rigidly connected state this moment, thereby obtained the no resonance peak transmission characteristics of substantially horizontal.
When being subjected to horizontal impact, the upper and lower ring (6) (14) of waist drum shape arc damping buffering spring assembly at first bumps against with the erosion control de-noising pad (21) that embeds or be glued on the outer casing inner wall, make arc damping buffering spring assembly in running order, increased horizontal rigidity, the substantially horizontal amount of deformation is restricted.Gap between cap (9) and the shell (7) is greater than the gap between the bed course (21) of upper and lower ring and shell at this moment.
The attachment bolt assembly is by locking nut (1) cap (9), attachment bolt (2) and locking nut compositions such as (1).
The lower end of attachment bolt has little flange, and its center bore inner wall and horizontal rigidity are regulated spring and rigidly connected, and lower external thread connects with adjusting nut, supporting vibration isolation spring (17).The upper end combines as a whole by locking nut and cap (8), and the center, upper end has screw and equipment bolt.Therefore, attachment bolt be with protected equipment and three independently elasticity-damper assembly be linked to be the key member of an integral body.
Compared with prior art, the present invention has following characteristics:
1, at x, y, the z three-dimensional is carried out swept frequency excitation respectively, and when system during in the resonance region, the damping ratio trend is infinitely great, η ≡ 1, and when entering the work of vibration damping district, damping ratio reduces gradually and trends towards zeroly, and transmissibility η value descends rapidly and goes to zero.Therefore, no resonance peak occurs in the whole frequency sweep frequency band of 0～5000HZ.
2, have comparatively ideal change rigidity, change damping characteristic, i.e. natural frequency during vibration isolation is low, makes vibrating isolation system enter the vibration damping district rapidly.When being subjected to impacting, rigidity and damping force strengthen gradually, can store in less deformation space and absorb more impact energy, and shock-absorbing capacity is good.Two kinds of functions of vibration isolation and buffering have been taken into account.
3, when actual load and load rating are inconsistent, the vertical equipoise of adjusting nut can regulate, the free deformation space when making upper and lower motion is symmetry equivalent.
4, the ratio of level and vertical stiffness can be regulated as required, and can retrain the rotary freedom around the Z axle on demand.
5, adopt fabricated structure, be convenient to be assembled into vibration isolator rapidly with specific (special) requirements by customer requirements.
Noise when 6, having reduced work.
Description of drawings
Fig. 1 is the structural drawing of isolation damper without resonant peaks;
Fig. 2 is arc buffer spring assembly force analysis figure;
Fig. 3 is the stereogram of four isolation damper without resonant peaks and protected equipment coupled condition.
Specific embodiments of the invention:
With nominal load among the present invention is that 15 kilograms isolation damper is an example, and implementation methods and anti-vibration and shock effect are described.
Nominal load: W
O=15 kilograms (10～20 kilograms of load range);
Natural frequency: f
O=5HZ ±
1 0:
1 7
Boundary dimension: long * wide * high (60 * 60 * 60)
The vibration isolation spring:
Steel wire diameter: 3～3.5mm
The number of turns: 9～10
Number of active coils: 7～8
Middle footpath: D=20～21mm
Length: 50～60mm
Arc spring leaf:
Radius of arc: 30～40mm
Sheet is thick: 1.5～2mm
Sheet is wide: 4～8mm
Sheet number: 8～16
Length of a film: 35～40mm
Horizontal rigidity is regulated spring:
Steel wire diameter: 1.1～1.5mm
Steel wire length: 30～40mm
The assembling magnitude of interference:
Cap and arc damping spring assembly: 0.005～0.15mm
Shell bottom plate and reed vertical: 0.005～0.15mm
Routine test condition: 5～30HZ constant amplitude frequency sweep, amplitude: A
O=1.5mm
Vibration: 30～5000HZ uniform acceleration frequency sweep: Z
m=5g
Impact: half sinusoid pulsewidth 11mm, peak acceleration 15g, 30g
Examination isolation damper self intensity.
The anti-vibration and shock technical order:
Every towards coefficient: η
a≤ 0.55
Vibration transmissibility: η ≡ 1(0～9HZ, A
0=1.5mm)
η＜1（9～5000HZ）
Distortion allowable: (ψ
m)≤6mm.
Adopt when of the present invention, low-frequency range (0～9HZ) makes protected equipment, and isolation damper and basis are puppet and rigidly connect state, transmissibility η ≡ 1 then, test result meets technical order.
Four isolation damper without resonant peaks are installed on the gravity plane of protected equipment (Fig. 3), can effectively vibrate and surge guard this equipment.
Claims (7)
1, a kind of to electromechanical equipment, particularly electronic instrument carries out the isolation damper without resonant peaks of vibration isolation and buffering usefulness, comprises shell [7], base plate [12], spring [17] erosion control noise reduction bed course [21].It is characterized in that it has:
A, a partiting spring polarization assembly, it comprises the adjusting nut [3] that matches with attachment bolt [2], and is positioned at the vibration isolation spring [17] between adjusting nut [3] and the base plate [12].
B, a waist drum shape arc damping buffering spring assembly, it comprises the arc spring leaf [8] that has at least more than three, and being contained in spacer ring [10] and ring up and down [6] [14] that makes arc spring leaf [8] fixed-site and the cushion cover [8] that the arc spring leaf upper and lower end is evenly distributed arc spring leaf, the inwall of arc spring leaf [8] contacts on every side with the lower edge of cap [9].
C, a horizontal rigidity are regulated spring assembly, it comprises the central position that is positioned at isolation damper, its upper end is by the accent silk spring [19] of the supporting of the aperture on the attachment bolt [2], and as the sliding plug [20] of lower support be fixed on sliding sleeve [18] on the base plate [12], the external diameter of sliding plug [20] is in axial sliding with the internal diameter of sliding sleeve [18] and cooperates.
D, an attachment bolt assembly, it comprises a locking nut [1], attachment bolt [2] and cap [9] link attachment bolt [2] and cap [9] by locking nut [1].
2, by claim 1, wherein said waist drum shape arc damping buffering spring assembly, it is characterized in that embedding spacer ring (10) between the upper and lower respectively along the equally distributed arc spring leaf (8) more than at least three of circumference, the lower end crimp of arc spring leaf (8) is with encircling (14) down, cushion cover (15), fixed through link (11), ring (6) chucking is used in the upper end of arc spring leaf (8), forms a whole.
3, by claim 1, wherein said partiting spring polarization assembly is characterized in that being equipped with on the adjusting nut (3) position limit pin (5), and position limit pin (5) cooperates with elongated slot on block a shot (9).
4, by claim 2, wherein said waist drum shape arc damping buffering spring assembly is characterized in that having under cushion cover (15) regulating and assembles the pad (16) that magnitude of interference is used.
5, by claim 1, wherein said cap (9) is characterized in that being shaped on the scale that the vertical equipoise of adjusting is used at its outer surface.
6, by claim 1, wherein said arc spring leaf (8) is characterized in that its section configuration can be rectangle, circle or oblate.
7, by claim 1, wherein, described wire spring (19) is characterized in that its section configuration can be circular or rectangle
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100564A CN85100564B (en) | 1985-04-01 | 1985-04-01 | Isolation damper without resonant peaks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100564A CN85100564B (en) | 1985-04-01 | 1985-04-01 | Isolation damper without resonant peaks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100564A true CN85100564A (en) | 1986-01-10 |
| CN85100564B CN85100564B (en) | 1988-02-24 |
Family
ID=4791264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100564A Expired CN85100564B (en) | 1985-04-01 | 1985-04-01 | Isolation damper without resonant peaks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100564B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497313B (en) * | 2008-01-28 | 2012-01-11 | 力帆实业(集团)股份有限公司 | Beach vehicle drive conversion buffering and reducing device |
| CN103161865A (en) * | 2013-03-15 | 2013-06-19 | 重庆大学 | Lock bead type vibration isolation bumper without harmonic peaks in three directions |
| CN103277443A (en) * | 2013-04-24 | 2013-09-04 | 南京捷诺环境技术有限公司 | Vibration isolator resisting inclination |
| CN109667881A (en) * | 2018-12-07 | 2019-04-23 | 中国飞机强度研究所 | A kind of protecting against shock friction vibration isolator |
-
1985
- 1985-04-01 CN CN85100564A patent/CN85100564B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497313B (en) * | 2008-01-28 | 2012-01-11 | 力帆实业(集团)股份有限公司 | Beach vehicle drive conversion buffering and reducing device |
| CN103161865A (en) * | 2013-03-15 | 2013-06-19 | 重庆大学 | Lock bead type vibration isolation bumper without harmonic peaks in three directions |
| CN103161865B (en) * | 2013-03-15 | 2015-04-22 | 重庆大学 | Lock bead type vibration isolation bumper without harmonic peaks in three directions |
| CN103277443A (en) * | 2013-04-24 | 2013-09-04 | 南京捷诺环境技术有限公司 | Vibration isolator resisting inclination |
| CN109667881A (en) * | 2018-12-07 | 2019-04-23 | 中国飞机强度研究所 | A kind of protecting against shock friction vibration isolator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100564B (en) | 1988-02-24 |
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| C13 | Decision | ||
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