CN108978441B - The semi-active control method and system of a kind of floating system stiffening girder of suspension bridge whirlpool vibration - Google Patents
The semi-active control method and system of a kind of floating system stiffening girder of suspension bridge whirlpool vibration Download PDFInfo
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- CN108978441B CN108978441B CN201810736357.4A CN201810736357A CN108978441B CN 108978441 B CN108978441 B CN 108978441B CN 201810736357 A CN201810736357 A CN 201810736357A CN 108978441 B CN108978441 B CN 108978441B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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Abstract
The invention discloses the semi-active control methods and system of a kind of vibration of floating system stiffening girder of suspension bridge whirlpool, and wherein control method includes: that controllable passive energy dissipation unit is arranged between bracket and the stiff girder of floating；Acquire the vibration response signal of stiff girder and the wind velocity signal of bridge floor；Judge whether stiff girder occurs whirlpool vibration response；If whirlpool vibration response has occurred, corresponding structural modal is identified, and judge whether the amplitude of whirlpool vibration response is greater than given threshold；If more than then being calculated with semi-active control algorithm and adjust the variable control parameters of controllable passive energy dissipation unit to optimal value.The present invention does not influence bridge normal operation, structure is simple, it is easy to implement, the whirlpool vibration that can be effectively controlled the multiple mode of large span floating system suspension bridge, greatly reduces the enforcement difficulty of vibration damping control measure, improves the economy of vibration damping control measure, good reliability, robustness is high, can still ensure that higher damping efficiency in structural parameters and inlet flow conditions there are in the case where uncertain factor.
Description
Technical field
The invention belongs to field of vibration control, in particular to the half of a kind of floating system stiffening girder of suspension bridge whirlpool vibration is main
Flowing control method and system.
Background technique
Charming appearance and behaviour stability is the governing factor of super-span suspension bridge construction.May be used by pneumatic type selecting and aerodynamic optimization
To improve the flutter stability of large-span suspension bridge significantly, enable to meet super-span suspension bridge within main span 2000m
Construction need.But the stiff girder whirlpool of large-span suspension bridge vibration problem (especially vertical whirlpool vibration problem) not yet solves very well.
For example, the Xihoumen Bridge in China and the big band Dong Qiao etc. of Denmark are observed under the Chang Yufeng speed of 6~10m/s after the Cheng Qiao
Amplitude is more than the vertical whirlpool vibration of 20cm.
The vibration of girder whirlpool, which refers to, generates flow separation and periodical Vortex Shedding when air-flow flows through main beam section, make girder two sides
There is the positive/negative pressure of alternately variation in surface, when the frequency of Vortex Shedding is close to structure first natural frequency, girder beam wind
To or torsional direction may generate the resonance of finite amplitude.
Compared with flutter, the whirlpool vibration of large-span suspension bridge has a characteristic that first, and vortex-induced vibration is that one kind is non-linear certainly
Clipping vibration.Although it can cause catastrophic failure to structure in a short time unlike flutter, the amplitude mistake but if whirlpool shakes
It is big then will affect the comfortable and safe of bridge up train, the normal operation of bridge is adversely affected, the whirlpool vibration frequently occurred is also
It may cause the fatigue rupture of component.Second, the whirlpool vibration of large-span suspension bridge shows as the vibration of single mode, but intrinsic frequency
Rate has the possibility that whirlpool vibration occurs in the curved mode of erecting within 0.6Hz in bridge normal operation wind speed limit value 25m/s.To the west of watchtower in ancient times
For door bridge, it is distributed with 8 in 0.5Hz or less and erects curved mode, by deck-molding D=3.50m, average Si Tuoluoha number St=
0.12 estimation, preceding 8 rank erect the corresponding whirlpool vibration starting of oscillation wind speed of curved mode all in 15m/s or less.Thereby it is ensured that large-span suspension bridge is each
The whirlpool vibration amplitude of rank mode meets the engineering problem that code requirement is engineering staff and the concern of bridge operation unit height.
The whirlpool vibration control of Longspan Bridge mainly has two methods of aerodynamic Measures and mechanical measure.
It is disconnected that aerodynamic Measures mainly adjust stiff girder by increasing the attached guiding devices such as deflector, tuyere or suppression plate
The shape in face achievees the purpose that inhibit stiff girder surface Development pattern whirlpool de-, generally implement in the design-build stage.
Mechanical measure refers to installs passive or active dissipative damping device on bridge, is inhaled by dissipative damping device
It receives and the whirlpool for the stiff girder that dissipates vibration energy achievees the purpose that reduce whirlpool vibration amplitude.There is the machinery of application to arrange in practical projects at present
If alms giver's tuning mass bumper (TMD), such as the Tokyo Bay Channel Bridge of Japan, the Rio Luo Nitai bridge of Brazil, China
Chongqi bridge and the Volga bridge etc. of Russia all use TMD damper the curved whirlpool vibration of erecting of stiff girder controlled
System.Above-mentioned bridge belongs to Steel Continuous Box beam bridge, and deck-molding is all in 5m or more, and at most only having preceding 3 rank to erect curved mode whirlpool vibration need to
It controls, therefore TMD has good applicability.
But it wants, it is very big that the TMD whirlpool vibration control for being used for large-span suspension bridge is implemented difficulty.Since it is desired that each
Rank erects the individually designed a set of damper of curved mode, and large-span suspension bridge may have up to ten ranks or more to add under 0.5Hz frequency
Strength beam vertical motion mode, every rank modal mass is by 20,000 tons of estimations.It is assumed that the quality of every set TMD is each rank modal mass
Total effective mass of 0.5%, TMD system will be more than 1000 tons.Secondly, the quiet elongation of TMD spring is only determined by the intrinsic frequency of TMD
It is fixed, it is assumed that the vertical frequency f=0.2Hz of girder, the quiet elongation of spring are about Δ=9.86/ (2 π f)2=6.25m, not only spring
Production is difficult, and can not be placed in stiff girder (deck-molding of putting more energy into is usually no more than 5m).On the other hand, additional on existing bridge
Aerodynamic Measures are also difficult.Because aerodynamic Measures must along bridge entirely across or most of span setting, aerodynamic Measures apply
Work process necessarily will affect the normal operation of bridge, it is also possible to certain society can be caused panic.In conclusion existing to solve
The whirlpool vibration problem of large-span suspension bridge needs to explore and study new whirlpool vibration control method.
Summary of the invention
In the prior art, the whirlpool vibration response of large-span suspension bridge is very difficult to control, and when being controlled using mechanical facility, needs
The individually designed damper of curved mode is erected for every single order, weight is big and production is difficult；When being controlled using pneumatic installations, need along bridge
Liang Quan across or Long span arrangement, influence normal operation.It is an object of the present invention in view of the above shortcomings of the prior art, provide
The semi-active control method and system of a kind of floating system stiffening girder of suspension bridge whirlpool vibration, are arranged between floating stiff girder and bridge tower
Controllable passive energy dissipation unit, does not influence bridge normal operation, without erecting the individually designed damper of curved mode, structure for every single order
Simply, easy to implement, it can be effectively controlled the whirlpool vibration of the multiple mode of large span floating system suspension bridge, greatly reduce vibration damping control
The enforcement difficulty of measure, improves the economy of vibration damping control measure, good reliability, and robustness is high, can in structural parameters and
There are in the case where uncertain factor, still ensure that higher damping efficiency for inlet flow conditions.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of semi-active control method of floating system stiffening girder of suspension bridge whirlpool vibration, its main feature is that the following steps are included:
The controllable passive energy dissipation vertically contributed is arranged in step A. between the stiff girder of bracket and floating on lower king-post strut
Unit；
Step B. acquires the vertical motion response signal of stiff girder and the wind velocity signal of bridge floor；
Step C. judges whether stiff girder occurs whirlpool vibration response according to vibration response signal and wind velocity signal；If stiff girder is not
Whirlpool vibration response occurs, then go to step B；If whirlpool vibration response has occurred in stiff girder, go to step D；
Step D. identifies the corresponding structural modal of stiff girder whirlpool vibration response, and judge stiff girder whirlpool vibration response amplitude whether
Greater than the given threshold of counter structure mode；If the amplitude of whirlpool vibration response is not more than corresponding given threshold, go to step
B；If the amplitude of whirlpool vibration response is greater than corresponding given threshold, step E is gone to；
Step E. semi-active control algorithm calculates and adjusts the variable control for the controllable passive energy dissipation unit vertically contributed
Parameter processed is to real-time optimal value, so that when stiff girder is far from its vertical equilbrium position, the resistance of controllable passive energy dissipation unit output
Buddhist nun's power is maximum, and when stiff girder is close to its vertical equilbrium position, the damping force of controllable passive energy dissipation unit output is minimum.
Multispan suspension bridge generally uses floating system to reduce the hogging moment of beam at bridge tower position, stiff girder and bridge tower it
Between be not provided with vertical support.From the point of view of the field measurement of the big band Dong Qiao of Denmark and Xihoumen Bridge, girder and bridge when vertical whirlpool shakes
Biggish relative vertical displacement can be generated in the intersection of stiff girder and bridge tower between tower.Therefore, between stiff girder and bridge tower
Passive energy dissipation unit, which is arranged, can control the vibration of vertical whirlpool and the vibration of torsion whirlpool of stiff girder multi-modes.Since large-span suspension bridge is each
Rank erects curved Mode Shape and modal mass is different from, and the passive energy dissipation cell parameters corresponding to the vertical whirlpool vibration control of each rank also can
There are larger differences.Even the vertical whirlpool vibration response of different wind angle of attack lower girders is also divided into power with single order whirlpool vibration mode,
Therefore also different to the parameter request of passive energy dissipation unit.In addition, the dynamic characteristics and whirlpool vibration response of practical bridge may be with
There are deviation, the optimal design parameters so as to cause passive energy dissipation unit change the prediction result in wind force proofing design stage.
Therefore, the present invention has invented a kind of semi-active control method of floating system stiffening girder of suspension bridge whirlpool vibration, supervises in real time
The vibration response signal of stiff girder and the wind velocity signal of bridge floor are surveyed, when the whirlpool vibration response of stiff girder is more than preset threshold, is called
Semi-active control algorithm, the variable control parameters by changing controllable passive energy dissipation unit realize the real-time tune of its Optimal Control Force
Section.Controllable passive energy dissipation unit utilizes the whirlpool vibration energy for floating the relative vertical displacement dissipation stiff girder between stiff girder and bridge tower
Amount, is reduced to the whirlpool vibration response of stiff girder within preset threshold, rings so as to reduce the whirlpool vibration of multiple mode of stiff girder
It answers.
The semi-active control algorithm is Bang-Bang semi-active control algorithm, belt restraining as a preferred method,
LQG algorithm or self-adapting fuzzy logic algorithm.
The semi-active control algorithm is Bang-Bang semi-active control algorithm as a preferred method,；
In the step E, is calculated with semi-active control algorithm and adjust the controllable passive energy dissipation unit vertically contributed
Variable control parameters to real-time optimal value the following steps are included:
Step E1 acquires the vertical velocity of stiff girder using the stiff girder vertical motion response signal acquired in step B
With the vertical displacement x of relative initial position；
Step E2 determines the controllable consumption vertically contributed according to the corresponding structural modal of whirlpool vibration response determined in step D
The maximum input voltage V of energy damper unitMAX；
Step E3, the input voltage for adjusting the controllable passive energy dissipation unit vertically contributed is real-time optimal value VOPT:
Based on the same inventive concept, the present invention also provides a kind of half actives of floating system stiffening girder of suspension bridge whirlpool vibration
Control system, its main feature is that including the controllable consumption vertically contributed between the bracket on lower king-post strut and the stiff girder of floating
Energy damper unit, further includes for acquiring the first acquisition unit of stiff girder vertical motion response signal, for acquiring bridge floor wind
The second acquisition unit and control unit of fast signal, wherein control unit: for being sentenced according to vibration response signal and wind velocity signal
Whether disconnected stiff girder occurs whirlpool vibration response, identifies the corresponding structural modal of whirlpool vibration response when whirlpool vibration response occurs for stiff girder,
And judge whether the amplitude of stiff girder whirlpool vibration response is greater than the given threshold of counter structure mode；In whirlpool, the amplitude of vibration response is greater than
When corresponding given threshold, is calculated with semi-active control algorithm and adjust the variable of the controllable passive energy dissipation unit vertically contributed
Control parameter is to real-time optimal value, so that the controllable energy consumption vertically contributed subtracts when stiff girder is far from its vertical equilbrium position
Shake unit output damping force it is maximum, when stiff girder is close to its vertical equilbrium position, the controllable passive energy dissipation vertically contributed
The damping force of unit output is minimum.
The semi-active control algorithm is Bang-Bang semi-active control algorithm, belt restraining as a preferred method,
LQG algorithm or self-adapting fuzzy logic algorithm.
The controllable passive energy dissipation unit is MR damper, eddy current damper or electricity as a preferred method,
Rheological damper.
First acquisition unit is the vertical motion sensing in the stiff girder of floating as a preferred method,
Device.
The vibrating sensor is vertical acceleration transducer as a preferred method,.
Second acquisition unit is the anemobiagraph on the stiff girder of floating as a preferred method,.
Described control unit is set in the stiff girder of floating as a preferred method,.
The present invention can either be implemented in the design phase of bridge, and particularly suitable for improving the whirlpool vibration property for being completed bridge
Can, compared with aerodynamic Measures or tuning mass bumper that the vibration control of existing suspension bridge whirlpool generallys use, the present invention has as follows
Advantage:
1, structure is simple, it is only necessary to which large span floating system suspension cable can be effectively controlled in a little several controllable passive energy dissipation units
The whirlpool of the multiple mode of bridge shakes, and without erecting the individually designed damper of curved mode for every single order, greatly reduces vibration damping control measure
Enforcement difficulty, improve the economy of vibration damping control measure, and do not influence bridge normal operation.
2, compared with passive control measure, semi- active control improves the vibration control of large span floating system stiffening girder of suspension bridge whirlpool
The reliability and robustness of system, can structural parameters and inlet flow conditions there are in the case where uncertain factor, still ensure that compared with
High damping efficiency.
Detailed description of the invention
Fig. 1 is control method flow chart of the present invention.
Fig. 2 is facade arrangement schematic diagram of the control system of the present invention on two Span Continuous floating system suspension bridges.
Fig. 3 is arrangement schematic diagram of the control system of the present invention in two Span Continuous floating system suspension bridge direction across bridge.
Wherein, 1 is lower king-post strut, and 2 be bracket, and 3 be stiff girder, and 4 be controllable passive energy dissipation unit, and 5 be the first acquisition unit,
6 be the second acquisition unit, and 7 be control unit.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, in the present embodiment, the semi-active control method of 3 whirlpool of floating system stiffening girder of suspension bridge vibration, packet
Include following steps:
The controllable energy consumption vertically contributed is arranged between the stiff girder 3 of bracket 2 and floating on lower king-post strut 1 and subtracts by step A.
Shake unit 4.Relative vertical motion when controllable passive energy dissipation unit 4 is shaken using whirlpool between stiff girder 3 and bridge tower is put more energy into dissipate
The vibrational energy of beam 3, to reduce 3 whirlpool of stiff girder vibration amplitude.In the present embodiment, controllable passive energy dissipation unit 4 is magnetic current variable resistance
Buddhist nun's device.
Step B. utilizes acceleration transducer real-time monitoring and acquires the vertical acceleration signal of stiff girder 3, utilizes wind speed
Instrument real-time monitoring and the wind velocity signal for acquiring bridge floor.
Step C. carries out time-domain analysis to the acceleration signal of stiff girder 3, and judges stiff girder 3 in conjunction with wind velocity signal size
Whether whirlpool vibration response (not only comprising stiff girder 3 vertical whirlpool vibration response, but also include stiff girder 3 reverse whirlpool vibration response) is occurred；If putting more energy into
Whirlpool vibration response does not occur for beam 3, then go to step B；If whirlpool vibration response has occurred in stiff girder 3, go to step D.
Step D. identifies the corresponding structural modal of 3 whirlpool vibration response of stiff girder, and judges that the amplitude of 3 whirlpool vibration response of stiff girder is
The no given threshold greater than counter structure mode；If the amplitude of whirlpool vibration response is not more than corresponding given threshold, step is jumped to
Rapid B；If the amplitude of whirlpool vibration response is greater than corresponding given threshold, step E is gone to.
Step E. semi-active control algorithm calculates and adjusts the variable control for the controllable passive energy dissipation unit 4 vertically contributed
Parameter processed is to real-time optimal value, so that when stiff girder 3 is far from its vertical equilbrium position, what controllable passive energy dissipation unit 4 exported
Damping force is maximum, and when stiff girder 3 is close to its vertical equilbrium position, the damping force that controllable passive energy dissipation unit 4 exports is minimum.
The semi-active control algorithm is LQG algorithm, the adaptive mode of Bang-Bang semi-active control algorithm, belt restraining
Fuzzy logic algorithm or other semi-active control algorithms.
In the present embodiment, the semi-active control algorithm is Bang-Bang semi-active control algorithm；In step E, use
Bang-Bang semi-active control algorithm calculates and adjusts the variable control parameters for the controllable passive energy dissipation unit 4 vertically contributed
To real-time optimal value the following steps are included:
Step E1 acquires the vertical opposite of stiff girder 3 using the 3 vertical motion response signal of stiff girder acquired in step B
SpeedWith the vertical displacement x of relative initial position.Due to 3 whirlpool center of percussion of stiff girder, lower king-post strut 1 and bracket 2 hardly happen perpendicular
To vibration, so,It directly can quadrature to obtain by the acceleration signal that acceleration transducer measures, x can be byQuadrature
Get.
Step E2 determines the controllable consumption vertically contributed according to the corresponding structural modal of whirlpool vibration response determined in step D
The maximum input voltage V of energy damper unit 4MAX。
For different whirlpool vibration mode, VMAXValue VMAX,i(i indicates whirlpool vibration mode) can be obtained by direct search,
Specific step is as follows: the first step, starts from scratch and increases V step by step by a fixed step sizeMAX, i.e. VMAX=k Δ S, k indicate k-th of search
Step, Δ S indicate step-size in search；Second step walks each search, assumes V in Bang-Bang control algolithmMAX=VMAX
(K), free vibration attenuation time-histories of the stiff girder 3 under initial displacement excitation is then calculated, and thus extracts 3 i-th rank of stiff girder
The damping ratio ξ i (K) of mode；Third step, when the ξ i (K) of some search step gets maximum value, corresponding VMAXIt (K) is VMAX
Optimal value VMAX,i。
Step E3, the input voltage for adjusting the controllable passive energy dissipation unit 4 vertically contributed is real-time optimal value VOPT:
So that maximum voltage is applied to controllable passive energy dissipation unit 4 when stiff girder 3 is far from its equilbrium position, it can
It is maximum to control the damping force that passive energy dissipation unit 4 exports, provides maximum damping force to stiff girder 3；When stiff girder 3 is close to its balance position
When setting, no-voltage is applied to controllable passive energy dissipation unit 4, the damping force that controllable passive energy dissipation unit 4 exports is minimum, to stiff girder
3 provide minimum damping force.
As shown in Figures 2 and 3, the semi- active control of the vibration of floating system stiffening girder of suspension bridge whirlpool used in the method for the present invention
System includes the controllable passive energy dissipation unit vertically contributed between the stiff girder 3 of the bracket 2 and floating on lower king-post strut 1
4, it further include for acquiring the first acquisition unit 5 of 3 vertical motion response signal of stiff girder, for acquiring bridge floor wind velocity signal
Second acquisition unit 6 and control unit 7, in which:
Control unit 7: for judging whether stiff girder 3 occurs whirlpool vibration response according to vibration response signal and wind velocity signal,
The corresponding structural modal of whirlpool vibration response is identified when whirlpool vibration response occurs for stiff girder 3, and judges the width of 3 whirlpool vibration response of stiff girder
Whether value is greater than the given threshold of counter structure mode；It is main with half when in whirlpool, the amplitude of vibration response is greater than corresponding given threshold
Dynamic control algolithm calculates and adjusts the variable control parameters of the controllable passive energy dissipation unit 4 vertically contributed to real-time optimal value,
So that the damping force for controllable passive energy dissipation unit 4 output vertically contributed is most when stiff girder 3 is far from its vertical equilbrium position
Greatly, when stiff girder 3 is close to its vertical equilbrium position, the damping force for controllable passive energy dissipation unit 4 output vertically contributed is most
It is small.
The controllable passive energy dissipation unit 4 vertically contributed is MR damper, eddy current damper, electric current variable resistance
Buddhist nun's device or other types of controllable passive energy dissipation unit 4, are in the present embodiment MR damper.
First acquisition unit 5 is the vertical motion sensor in the stiff girder 3 of floating.The vibrating sensor
For vertical acceleration transducer.
Second acquisition unit 6 is the anemobiagraph on the stiff girder 3 of floating.
Control unit 7 is mounted on inside the stiff girder 3 of MR damper installed position, and respectively with magnetorheological damping
Device, acceleration transducer and anemobiagraph are connected.
The present embodiment is with the stiff girder whirlpool vibration control of two Span Continuous floating system suspension bridges for background.Such as Fig. 2 and Fig. 3 institute
Show, controllable passive energy dissipation unit 4 is set to the intersection of continuous stiff girder 3 with unilateral bridge tower, and the number of controllable passive energy dissipation unit 4
Amount is 2.When the floating system suspension bridge is three stride continuous suspension bridge, controllable passive energy dissipation unit 4, which is located at, continuously puts more energy into
The intersection of beam 3 and two sides bridge tower, and every side bridge tower each 2, it 4 altogether, is not shown in the accompanying drawings, but have no effect on this field
Technical staff's the understanding of the present invention and realization.
2 controllable passive energy dissipation units 4 are arranged symmetrically in 3 two sides of stiff girder along direction across bridge, controllable passive energy dissipation unit 4
Upper connector is connected with stiff girder 3, and the lower connector of controllable passive energy dissipation unit 4 is connected with bracket 2.
First acquisition unit, 5 acceleration transducer is also 2, and 2 acceleration transducers are symmetrically mounted on along direction across bridge to be added
Inside strength beam 3.
Second acquisition unit, 6 anemobiagraph is also 2, and 2 anemobiagraphs are symmetrically pacified in the outer lateral edge direction across bridge of span centre stiff girder 3
Dress.
When the vibration of vertical whirlpool occurs under the action of incoming flow wind field for the stiff girder 3 of two Span Continuous floating system suspension bridges, add
Relative vertical motion occurs for strength beam 3 and lower king-post strut 1, to make the upper and lower connector of MR damper that relatively vertical position occur
It moves and generates damping force, the damping force can dissipate the vibrational energy of stiff girder 3, to reduce the vertical whirlpool vibration of stiff girder 3
Amplitude.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than limitation, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, within these are all belonged to the scope of protection of the present invention.
Claims (10)
1. a kind of semi-active control method of floating system stiffening girder of suspension bridge whirlpool vibration, which comprises the following steps:
The controllable energy consumption vertically contributed is arranged between the stiff girder (3) of bracket (2) and floating on lower king-post strut (1) in step A.
Damper unit (4)；
Step B. acquires the vertical motion response signal of stiff girder (3) and the wind velocity signal of bridge floor；
Step C. judges whether stiff girder (3) occurs whirlpool vibration response according to vibration response signal and wind velocity signal；If stiff girder (3)
Whirlpool vibration response does not occur, then go to step B；If whirlpool vibration response has occurred in stiff girder (3), go to step D；
Step D. identifies the corresponding structural modal of stiff girder (3) whirlpool vibration response, and judges that the amplitude of stiff girder (3) whirlpool vibration response is
The no given threshold greater than counter structure mode；If the amplitude of whirlpool vibration response is not more than corresponding given threshold, step is jumped to
Rapid B；If the amplitude of whirlpool vibration response is greater than corresponding given threshold, step E is gone to；
Step E. semi-active control algorithm calculates and adjusts the variable control for the controllable passive energy dissipation unit (4) vertically contributed
Parameter is to real-time optimal value, so that controllable passive energy dissipation unit (4) exports when stiff girder (3) are far from its vertical equilbrium position
Damping force it is maximum, when stiff girder (3) are close to its vertical equilbrium position, the damping force of controllable passive energy dissipation unit (4) output
It is minimum.
2. the semi-active control method of floating system stiffening girder of suspension bridge as described in claim 1 whirlpool vibration, which is characterized in that institute
Stating semi-active control algorithm is that Bang-Bang semi-active control algorithm, the LQG algorithm of belt restraining or self-adapting fuzzy logic are calculated
Method.
3. the semi-active control method of floating system stiffening girder of suspension bridge as described in claim 1 whirlpool vibration, which is characterized in that institute
Stating semi-active control algorithm is Bang-Bang semi-active control algorithm；
In the step E, calculated with semi-active control algorithm and adjust the controllable passive energy dissipation unit (4) vertically contributed can
Become control parameter to real-time optimal value the following steps are included:
Step E1 acquires the vertical velocity of stiff girder (3) using stiff girder (3) the vertical motion response signal acquired in step B
With the vertical displacement x of relative initial position；
Step E2 determines that the controllable energy consumption vertically contributed subtracts according to the corresponding structural modal of whirlpool vibration response determined in step D
The maximum input voltage V of vibration unit (4)MAX；
Step E3, the input voltage for adjusting the controllable passive energy dissipation unit (4) vertically contributed is real-time optimal value VOPT:
4. a kind of semi-active control aystem of floating system stiffening girder of suspension bridge whirlpool vibration, which is characterized in that including being set to lower king-post strut
(1) bracket (2) on and the controllable passive energy dissipation unit (4) vertically contributed between the stiff girder (3) of floating further include using
It is adopted in first acquisition unit (5) of acquisition stiff girder (3) vertical motion response signal, for acquiring the second of bridge floor wind velocity signal
Collect unit (6) and control unit (7), in which:
Control unit (7): for judging whether stiff girder (3) occurs whirlpool vibration response according to vibration response signal and wind velocity signal,
The corresponding structural modal of whirlpool vibration response is identified when whirlpool vibration response occurs for stiff girder (3), and judges stiff girder (3) whirlpool vibration response
Amplitude whether be greater than the given threshold of counter structure mode；When in whirlpool, the amplitude of vibration response is greater than corresponding given threshold, use
Semi-active control algorithm calculates and adjusts the variable control parameters of the controllable passive energy dissipation unit (4) vertically contributed in real time most
The figure of merit, so that the controllable passive energy dissipation unit (4) vertically contributed exports when stiff girder (3) are far from its vertical equilbrium position
Damping force it is maximum, when stiff girder (3) are close to its vertical equilbrium position, the controllable passive energy dissipation unit (4) vertically contributed
The damping force of output is minimum.
5. the semi-active control aystem of floating system stiffening girder of suspension bridge as claimed in claim 4 whirlpool vibration, which is characterized in that institute
Stating semi-active control algorithm is that Bang-Bang semi-active control algorithm, the LQG algorithm of belt restraining or self-adapting fuzzy logic are calculated
Method.
6. the semi-active control aystem of floating system stiffening girder of suspension bridge as described in claim 4 or 5 whirlpool vibration, feature exist
In the controllable passive energy dissipation unit (4) vertically contributed is MR damper, eddy current damper or er damping
Device.
7. the semi-active control aystem of floating system stiffening girder of suspension bridge as described in claim 4 or 5 whirlpool vibration, feature exist
In first acquisition unit (5) is the vertical motion sensor in the stiff girder (3) of floating.
8. the semi-active control aystem of floating system stiffening girder of suspension bridge as claimed in claim 7 whirlpool vibration, which is characterized in that institute
Stating vibrating sensor is vertical acceleration transducer.
9. the semi-active control aystem of floating system stiffening girder of suspension bridge as described in claim 4 or 5 whirlpool vibration, feature exist
In second acquisition unit (6) is the anemobiagraph on the stiff girder (3) of floating.
10. the semi-active control aystem of floating system stiffening girder of suspension bridge as described in claim 4 or 5 whirlpool vibration, feature exist
In described control unit (7) is set in the stiff girder (3) of floating.
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| CN111696315B (en) * | 2019-03-15 | 2022-01-04 | 中国石油化工股份有限公司 | Wind vibration safety early warning method for towering tower equipment |
| CN112853939B (en) * | 2021-03-25 | 2023-04-07 | 深圳大学 | Bridge self-adaptive wind vibration suppression device |
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