CN207032551U - The adjustable passive negative stiffness damper of series mechanism - Google Patents

The adjustable passive negative stiffness damper of series mechanism Download PDF

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Publication number
CN207032551U
CN207032551U CN201720201155.0U CN201720201155U CN207032551U CN 207032551 U CN207032551 U CN 207032551U CN 201720201155 U CN201720201155 U CN 201720201155U CN 207032551 U CN207032551 U CN 207032551U
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stiffness
negative
connector
unit
damper
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周鹏
李惠
刘敏
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

A kind of adjustable passive negative stiffness damper of series mechanism, including positive stiffness and negative stiffness serial mechanism and normal damper, described positive stiffness and negative stiffness serial mechanism includes positive rigidity unit and negative stiffness unit, described positive rigidity unit includes mechanical spring and upper and lower connector, the both ends of mechanical spring are fixedly connected with upper and lower connector respectively, ensure that mechanical spring can bear tension and compression Cyclic Loading;Described negative stiffness unit includes housing, two pre-compressed springs, guide rod and sliding block, the lower end of guide rod is fixedly attached to the center of housing bottom surface, slide block set is on guide rod, can be along the free smooth movement of guide rod, damping unit is overall in parallel with positive negative stiffness serial mechanism, it can only adjust rigidity and be damped without changing;Normal damper part is in parallel respectively by constructing with positive rigidity or negative stiffness, then rigidity and damping can be adjusted simultaneously.The utility model can improve the antidetonation effectiveness in vibration suppression to civil structure especially oversize civil structure.

Description

The adjustable passive negative stiffness damper of series mechanism
Technical field
The utility model belongs to vibration control of civil engineering structure field, and in particular to a kind of series mechanism it is adjustable passive Negative stiffness damper.
Background technology
With economic development and technological progress, civil structure volume is also more and more big, such as GuangZhou, China TV tower height 600m, then total height reaches 828m to Dubai Harry methods tower;The Chinese Su-Tong Brideg car built up for 2008, main span break through km level, Reach 1088m, the Russian island Main Bridge built up for 2012 is across then reaching 1102m.As cable-stayed bridge main bearing member, Russia sieve Most long suspension cable is 483m in this island bridge, and the most long suspension cable of Chinese Su-Tong Brideg reaches 577m.The increase of volume to tie Structure or member period become longer, and damping is smaller, in random Sudden Natural Disasters such as earthquake, high wind, easily occur strong Vibration, or even damage and cause casualties and economic loss.Structural vibration control is then dissipated by additional damping device Or vibrational energy is absorbed, structural damping level can be significantly improved, reduces stature dynamic-load response, and then realize mesh of preventing and reducing natural disasters 's.The performance of damping force of control device substantially determines the effect achieved by structural vibration control.
Limited by installation site and performance itself, conventional damper can give civil engineering structure, especially ultra-large volume soil The additional damping ratios that wood engineering structure provides seem further insufficient.In the active such as cable-stayed bridge, suspension cable, half active vibration control In system research, scholars have found that negative stiffness trend damping force can increase installed position displacement, and then increase power consumption, realize more Big damping ratio and more excellent control effect.And active, the negative stiffness damping force of semi- active control need controller, sensor, outer The supports such as portion's energy carry out real-time implementation, complex, and the negative stiffness size that can be realized is also limited by half and actively hindered to a certain extent Performance of Buddhist nun's device itself.Therefore, how passively to realize negative stiffness, and the negative stiffness power for realizing any needs can be adjusted, with up to Then become to vibration control needs level and improve civil engineering structure especially ultra-large volume civil structure vibration control effect Effective way.
Utility model content
Based on above weak point, the utility model provides a kind of adjustable passive negative stiffness damper of series mechanism, In the case of existing less passive negative stiffness and damping, bigger negative stiffness and damping are realized by series mechanism regulation, with compared with Small cost realizes civil engineering structure controling power especially needed for ultra-large volume civil engineering structure antidetonation vibration damping, available for building Structure, bridge, drag-line, especially the antidetonation vibration damping such as ultra-large volume civil structure.
The utility model purpose is realized in:A kind of adjustable passive negative stiffness damper of series mechanism, including just, Negative stiffness serial mechanism and normal damper, described positive stiffness and negative stiffness serial mechanism include positive rigidity unit and negative stiffness unit,
Described positive rigidity unit includes mechanical spring and upper and lower connector, the both ends of mechanical spring respectively with upper and lower company Fitting is fixedly connected, and ensures that mechanical spring can bear tension and compression Cyclic Loading;
Described negative stiffness unit includes housing, two pre-compressed springs, guide rod and sliding block, the lower end of guide rod and is fixedly attached to The center of housing bottom surface, slide block set on guide rod, can along the free smooth movement of guide rod, the both sides of sliding block respectively with one One end connection of pre-compressed spring, other end and the housing inwall of each pre-compressed spring are hinged;
Circular hole is all provided among described upper and lower connector, upper and lower connector can pass through described guide rod and freely transport Dynamic, lower connector is fixedly connected with a slide block;
The piston rod upper end of normal damper is fixedly connected with the upper connector parallel connection of positive rigidity unit, normal damper Fixing end is fixedly connected with the housing of negative stiffness unit, so as to form structure one.
The utility model also has following technical characteristic:
1 or the piston rod of normal damper be fixedly connected as a part for guide rod with the sliding block of negative stiffness unit, it is general The fixing end of logical damper is fixedly connected with the center of the housing bottom surface of negative stiffness unit, so as to form structure two;
2 or the piston rod upper end of normal damper be fixedly connected with the upper connector of positive rigidity unit, normal damper Fixing end be fixedly connected with the lower connector of positive rigidity unit, normal damper is co-located on mechanical spring upper and lower Between connector, so as to form structure three.
3rd, for the moment, by choosing different-stiffness mechanical spring, and bigger negative stiffness is realized when for structure, is consumed without changing Can damping force.
4th, when for structure two or three when, while adjust and change rigidity and damping;From different mechanical spring rigidity, can adjust Section realizes bigger negative stiffness and damping.
This damper introduces internal displacement when in use, by positive stiffness and negative stiffness serial mechanism, does not change extraneous end and connects Connect, so extraneous end is consistent with conventional damper with the connection of structure.The control needed according to Design on Vibration Control theory After power processed, then appropriate positive rigidity cell parameters can be selected according to existing less negative stiffness and damping, regulation is amplified negative firm Degree and damping, larger negative stiffness and damping are realized with smaller cost, improve the vibration control effect to civil engineering structure/component Fruit.
Damper of the present utility model,, can be with the case of known smaller negative stiffness and damping by introducing regulation mechanism Change regulation and realize bigger more excellent negative stiffness and damping to reach required level.
Brief description of the drawings
Fig. 1 is positive stiffness and negative stiffness serial mechanism structure chart;
Fig. 2 is the adjustable passive negative stiffness damper structure diagram of the series mechanism of embodiment 2;
Fig. 3 is the adjustable passive negative stiffness damper structure diagram of the series mechanism of embodiment 3;
Fig. 4 is the adjustable passive negative stiffness damper structure diagram of the series mechanism of embodiment 4;
Fig. 5 is when to take damping is alinear viscous damp, power-displacement lagging curve synoptic diagram of structure shown in embodiment 2;
Fig. 6 is when to take damping is alinear viscous damp, power-displacement lagging curve synoptic diagram of structure shown in embodiment 3;
Fig. 7 is when to take damping is Coulomb friction power, power-displacement lagging curve synoptic diagram of structure shown in embodiment 3.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the utility model is described in further detail, but the scope of protection of the utility model It is not only limited in this.
Embodiment 1
With reference to shown in Fig. 1, the positive stiffness and negative stiffness serial mechanism of the present embodiment, including positive stiffness and negative stiffness unit, described is just firm Degree unit includes mechanical spring 2 and upper and lower connector 1.3, and the both ends of mechanical spring 2 are fixed with upper and lower connector 1.3 respectively to be connected Connect, ensure that mechanical spring 1 can bear tension and compression Cyclic Loading;
Described negative stiffness unit, which includes 7, two pre-compressed springs 6 of housing, guide rod 5 and sliding block 4, the lower end of guide rod 5, to be fixed Be connected to the center of the bottom surface of housing 7, sliding block 4 is enclosed on guide rod 5, can along 5 free smooth movement of guide rod, the two of sliding block 4 The one end of side respectively with a pre-compressed spring 6 is connected, and other end and the inwall of housing 7 of each pre-compressed spring 6 are hinged;
Circular hole is all provided among described upper and lower connector, upper and lower connector can pass through described guide rod and freely transport Dynamic, lower connector is fixedly connected with a slide block.
Embodiment 2
With reference to shown in Fig. 2, a kind of adjustable passive negative stiffness damper of series mechanism, including it is positive and negative described in embodiment 1 Rigidity serial mechanism and normal damper, normal damper can be that the arbitrary dissipation energy such as viscous, friction is contributed, common resistance The piston rod upper end of Buddhist nun's device is fixedly connected with the upper connector parallel connection of positive rigidity unit, the fixing end and negative stiffness of normal damper The housing of unit is fixedly connected;By changing different-stiffness mechanical spring 2, it can adjust and realize bigger negative stiffness, without changing Become power consumption damping force.
Embodiment 3
With reference to Fig. 3, a kind of adjustable passive negative stiffness damper of series mechanism, including the positive stiffness and negative stiffness described in embodiment 1 Serial mechanism and normal damper, normal damper can be that the arbitrary dissipation energy such as viscous, friction is contributed, normal damper Piston rod be fixedly connected as a part for guide rod with the sliding block of negative stiffness unit, the fixing end and negative stiffness of normal damper The center of the housing bottom surface of unit is fixedly connected, the adjustable passive negative stiffness damper for the series mechanism that the present embodiment provides, can Adjust simultaneously and realize bigger negative stiffness and bigger power consumption damping force.
Embodiment 4
With reference to Fig. 4, a kind of adjustable passive negative stiffness damper of series mechanism, including the positive stiffness and negative stiffness described in embodiment 1 Serial mechanism and normal damper, normal damper can be that the arbitrary dissipation energy such as viscous, friction is contributed, normal damper Piston rod upper end be fixedly connected with the upper connector of positive rigidity unit, under the fixing end of normal damper and positive rigidity unit Connector is fixedly connected, and now, normal damper and mechanical spring is co-located between being vertically connected with part, the present embodiment carries The adjustable passive negative stiffness damper of the series mechanism of confession, can simultaneously adjust and realize bigger negative stiffness and bigger power consumption damping force.
Embodiment 5
It is the adjustable passive negative stiffness damper of series mechanism provided by the utility model, fixed existing with reference to Fig. 5-7 In the case of negative stiffness and damping unit, using power-displacement lagging curve synoptic diagram during different positive rigidity.
Fig. 5 is using structure in embodiment 2, wherein hysteresis loop when damping uses the linear coefficient of viscosity as 1, transverse axis table Show nondimensional displacement, the longitudinal axis is that dimensionless is contributed, k1Original negative stiffness is represented, its value is equal to -1.Using different positive rigidity k2When, Work as k2When=1.2, adjustable passive negative stiffness damper hysteresis loop realizes that negative stiffness is -6, is exaggerated 6 times;Work as k2When=1.8, Adjustable passive negative stiffness damper hysteresis loop realizes that positive rigidity is -2.25, is numerically significantly greater than original rigidity value.
Fig. 6 is using structure in embodiment 3, when damping uses alinear viscous damp, original dimensionless negative stiffness k1=-1, Dimensionless viscous damping c1=0.15.As positive rigidity k2When=1.2, hysteresis loop negative stiffness trend is -3.4, is exaggerated 3.4 times; As positive rigidity k2=1.8, adjustable passive negative stiffness damper realizes negative stiffness -2.1, is exaggerated 2.1 times;In the case of two kinds, glue Stagnant damping unit obtains greatly enlarged, is exaggerated 23.3 times and 4.9 times respectively, shows as in Fig. 6 hysteresis loop significantly than original Have that hysteresis loop is full, that is, dissipate more vibrational energies.
Fig. 7 is using structure in embodiment 3, when damping uses Coulomb friction power, original dimensionless negative stiffness k1=-1, nothing It is 0.5 to measure Coulomb friction power.As positive rigidity k2When=1.2, hysteresis loop negative stiffness trend is -6, is exaggerated 6 times, and coulomb rubs It is 3 to wipe power, is equally exaggerated 6 times;As positive rigidity k2=1.8, adjustable passive damping device realizes positive rigidity 2.25, Coulomb friction power For 1.13,2.25 times are equally exaggerated.
Adjustable passive negative stiffness damper realizes that effect is similar with adjustable passive negative stiffness damper in Fig. 3 in Fig. 4, herein No longer list in detail.It is worthy of note that Fig. 5-7 pairs of negative stiffnesses and damping multiplication factor are connected under specific parameters combinations Effect achieved by the adjustable passive negative stiffness damper of mechanism, adjusts different parameters numerical value, can realize larger amplify with Regulating effect.
The utility model provides a kind of adjustable passive negative stiffness damper of series mechanism, can choose as needed suitable Work as parameter, original negative stiffness and damping are amplified in regulation, are realized that bigger more excellent damper is contributed with smaller cost, are reached civil engineering Controling power needed for structure, especially ultra-large volume civil engineering structure vibration antidetonation vibration damping.

Claims (3)

1. a kind of adjustable passive negative stiffness damper of series mechanism, including positive stiffness and negative stiffness serial mechanism and normal damper, institute The positive stiffness and negative stiffness serial mechanism stated includes positive rigidity unit and negative stiffness unit, it is characterised in that:
Described positive rigidity unit includes mechanical spring and upper and lower connector, the both ends of mechanical spring respectively with upper and lower connector It is fixedly connected, ensures that mechanical spring can bear tension and compression Cyclic Loading;
Described negative stiffness unit includes housing, two pre-compressed springs, guide rod and sliding block, the lower end of guide rod and is fixedly attached to housing The center of bottom surface, slide block set on guide rod, can along the free smooth movement of guide rod, the both sides of sliding block respectively with a precompressed One end connection of spring, other end and the housing inwall of each pre-compressed spring are hinged;
Circular hole is all provided among described upper and lower connector, upper and lower connector can pass through described guide rod, and can be free Motion, lower connector are fixedly connected with a slide block;
The piston rod upper end of described normal damper is fixedly connected with the upper connector parallel connection of positive rigidity unit, normal damper Fixing end be fixedly connected with the housing of negative stiffness unit.
2. a kind of adjustable passive negative stiffness damper of series mechanism, including positive stiffness and negative stiffness serial mechanism and normal damper, institute The positive stiffness and negative stiffness serial mechanism stated includes positive rigidity unit and negative stiffness unit, it is characterised in that:
Described positive rigidity unit includes mechanical spring and upper and lower connector, the both ends of mechanical spring respectively with upper and lower connector It is fixedly connected, ensures that mechanical spring can bear tension and compression Cyclic Loading;
Described negative stiffness unit includes housing, two pre-compressed springs and sliding block, work of the slide block set in described normal damper , can be along the free smooth movement of piston rod on stopper rod, the one end of the both sides of sliding block respectively with a pre-compressed spring is connected, each pre- The other end of pressing spring is hinged with housing inwall;
Circular hole is all provided among described upper and lower connector, upper and lower connector can pass through described piston rod, and can be certainly By moving, lower connector is fixedly connected with a slide block;
The fixing end of described normal damper is fixedly connected with the center of the housing bottom surface of negative stiffness unit.
A kind of 3. adjustable passive negative stiffness damper of series mechanism according to claim 1, it is characterised in that:By described in The fixing end of normal damper be fixedly connected with the housing of negative stiffness unit, replace with:The fixing end of normal damper with just The lower connector of rigidity unit is fixedly connected, and normal damper and mechanical spring are co-located between upper and lower connector.
CN201720201155.0U 2017-03-03 2017-03-03 The adjustable passive negative stiffness damper of series mechanism Active CN207032551U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110552439A (en) * 2019-07-25 2019-12-10 宁波工程学院 One-way energy consumption device with self-resetting capability and shear wall
CN110805645A (en) * 2019-11-18 2020-02-18 哈尔滨工业大学 Flexible supporting electromagnetic quasi-zero stiffness vibration isolation device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110552439A (en) * 2019-07-25 2019-12-10 宁波工程学院 One-way energy consumption device with self-resetting capability and shear wall
CN110552439B (en) * 2019-07-25 2021-08-24 宁波工程学院 One-way energy consumption device with self-resetting capability and shear wall
CN110805645A (en) * 2019-11-18 2020-02-18 哈尔滨工业大学 Flexible supporting electromagnetic quasi-zero stiffness vibration isolation device

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