CN104568351B - Damping-structure-optimized blade testing experiment table and experimental method thereof - Google Patents
Damping-structure-optimized blade testing experiment table and experimental method thereof Download PDFInfo
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Abstract
The invention discloses a damping-structure-optimized blade testing experiment table and an experimental method thereof. The testing experiment table comprises a base rack, a blade root fixing device, a damping structure device and a shock excitation loading device. The experimental method comprises the following steps: (1) sequentially mounting the blade root fixing device, a to-be-tested blade, the damping structure device, the shock excitation loading device, a three-dimensional laser vibration measurement instrument and a connection data acquiring device; (2) regulating the position of a loading nut, and regulating positive pressure and the like between a friction damping block and a ball disc; (3) starting a data acquiring device and a vibration exciter, starting the three-dimensional laser vibration measurement instrument, meanwhile recording the mode of the ball disc, a friction damping positive pressure, a damping structure applying height, a vibration exciting rod height and an exciting force; (4) changing a parameter set in the step (2); (5) analyzing influences of the friction damping positive pressure, the damping structure applying height, the vibration exciting rod height, the exciting force and a friction structure contact surface on a vibration characteristic of the blade, and drawing a corresponding curve.
Description
Technical field
The present invention relates to experimental provision technical field, and in particular to a kind of turbine blade with damping structure is in reality
Damping structure optimization blade testing experimental bench and its experimental technique under running status.
Background technology
Blade carries the vital task for steam thermal energy being converted into mechanical energy in steam turbine, is most important in steam turbine
One of parts.Large-size steam turbine Leaf number often up to thousand of, and centrifugal force, stable state are subject in operation
The collective effect of air-flow power and unstable state air-flow power.Additionally, when steam turbine works under various off-design behaviours, still suffering from bearing
Larger Airflow Exciting-Vibration Force that lotus changes under the alternate stress and little volume operating mode for bringing etc..Any of the above load is acted on and causes leaf
The working environment of piece is extremely complex severe, and blade accident happens occasionally, and vibrating fatigue is the main cause for causing to destroy, unlubricated friction
It is a kind of very effective mode for suppressing blade vibration to wipe damping structure.Each turbine making producer on blade especially
Widely used damping shroud and various lashing wire patterns (loose lashing wire, boss lashing wire etc.) on middle linear leaf, to reduce shaking for blade
Dynamic stress.
Damping shroud and boss lashing wire structure are widely used in modern Long Turbine Blades design, and blade receives centrifugal force
Effect deformation makes adjacent blades shroud and lashing wire contact and compress, so as to pass through the effect of the dry friction between shroud and lashing wire contact surface
Come the vibrational energy that dissipates, blade vibration stress is reduced, and make blade presentation whole circle vibration improve its vibration characteristics.Chinese scholars
The Mathematical Modelings of Dry Sliding Friction and Wear Characteristics between various description contact surfaces are proposed, but due to the complexity of contact friction, it is difficult to one kind
General model describing, and pass through experimental study can for theory analysis provide reliable checking according to and model basis ginseng
Number.
At present, both at home and abroad each producer tests for blade damping characteristic and is all only limitted to the shroud of fixed position or the resistance of lashing wire
Buddhist nun's structure, does not consider diverse location, different normal pressures and different contacts area for the impact of blade damping characteristic.
Although damping shroud and boss lashing wire structure are widely used in a variety of applications on blade, the research of correlation
Especially study mechanism is also very insufficient, for the optimization also wretched insufficiency of its structural behaviour.So, carry out for particular vane
Damping structure position optimization research under the effect of different operating modes has very big engineering application value.
Further, since steam turbine develops towards more high-power and more high parameter, exploitation more linear leaf become inexorable trend and
Limit the main cause of steam turbine.Using conventional damper shroud structure huge centrifugal force, many lashing wire damping structures can be caused to become
The main trend of longer developer blade.
The content of the invention
Present invention aims to the deficiency of current blade damping structure experimental study, especially for different operations
A kind of deficiency of state, different structure lower blade damping structure optimizing research, there is provided damping structure optimization blade testing experiment
Platform and its experimental technique, are that more linear leaf of the further development with many lashing wires and complicated damping structure is laid a good foundation.
To achieve these goals, the present invention is adopted the following technical scheme that is：
A kind of damping structure optimizes blade testing experimental bench, including base frame, blade root fixing device, damping structure device
With exciting charger；Wherein,
Base frame includes base plate and two side plates being symmetrically welded on base plate, is symmetrically welded with the inside of two side plates
Vertically go up on two cushion blocks, and two side plates and symmetrically offer some first straight troughs；
Blade root fixing device includes blade root slot and fastening bolt, and the centre of blade root slot is offered for being embedded in blade and blade to be measured
The groove of root, is provided with the fastening bolt for applying load straight up to blade root below groove；
Damping structure device includes the blade draw-in groove for fixing blade blade to be measured, and the two ends of blade draw-in groove are respectively provided with
There is a ball disk, each ball disk is contacted respectively with symmetrically arranged two frictional damping blocks point, and each frictional damping block sets respectively
Put in one end of a damping frame, and by screw rod and loading nut and the static force sensor phase being arranged on the damping frame
Even, the other end of each damping frame is embedded in the first straight trough on correspondence side plate by elongation bar, can be along the side of the first straight trough
To moving up and down, and its position is fixed by nut；
Exciting charger includes exciter support flat board and is symmetricly set on two straight panels of its both sides, and two straight panels are divided
Not Tong Guo bolt on two side plates, some support deep-slotted chip breakers are provided with exciter support flat board, vibrator is fixed on flat board,
The second straight trough is provided with flat board, is arranged on flat board on exciter support flat board, and vibrator is adjusted by some support deep-slotted chip breakers
Its angle in the horizontal direction is saved, its extension elongation is adjusted by the second straight trough；By swashing between vibrator and blade to be measured
The bar that shakes contacts, and the dynamic force snesor for measuring blade exciting force size to be measured is placed with the middle of exciting rod.
The present invention is further improved by：The test experimental bed includes two sets of damping structure devices.
The present invention is further improved by：It is carved with first straight trough edge and adds for adjusting damping structure device and exciting
Carry the scale for putting the position on two side plates.
The present invention is further improved by：Vertically go up on two side plates and respectively offer 6 the first straight troughs.
The present invention is further improved by：Exciting rod is using the thick middle thin variable section structure in two ends.
A kind of damping structure optimizes the experimental technique of blade testing experimental bench, comprises the following steps：
1) base frame is placed on basic platform, according to measurement demand, select ball dish-type number to be measured and target to apply resistance
Buddhist nun position, installs successively blade root fixing device, blade to be measured, damping structure device, exciting charger, three-dimensional laser vialog
And connection data acquisition unit；Ensure that blade root is nested in blade root slot, blade is nested in the blade draw-in groove of damping structure device
Interior, exciting rod top is adjacent to blade surface to be measured, screw everywhere bolt with each part position of fixation test platform；
2) adjustment loading nut location, adjusts normal pressure size between frictional damping block and ball disk, and its concrete data is by quiet
State force sensor measuring is obtained, while ensureing the blade both sides ball dish-type number and frictional damping normal pressure size of same leaf high position
It is equal；Adjustment vibrator position, applies in vertical direction exciting effect to blade surface, exciting force size and excited frequency by
Data acquisition unit is obtained to the dynamic force sensor measuring in exciting rod centre position；
3) log-on data harvester and vibrator, after blade vibration is in stable condition, start three-dimensional laser vialog pair
Blade body vibration situation is scanned, while record ball dish-type number, frictional damping normal pressure, damping structure and applying height, swashing
Shake bar height and exciting force size；
4) loading nut location, ball dish-type number, vibrator frequency, exciter support height and damping structure are changed respectively
Device height, is applied with controlling frictional damping normal pressure, frictional damping contact area, exciting force size, excitation force frequency, exciting force
Plus position and frictional damping effect apply the change of position, repeat step 2) to step 3), and record data and corresponding leaf
Piece shakes shape figure；
5) frictional damping normal pressure, damping structure are analyzed and applies height, exciting rod height, exciting force size, friction structure
Contact surface size draws response curve for the impact of blade vibration characteristic.
The present invention is further improved by, further comprising the steps of：
6) use instead compared with step 1) the longer leaf model of Leaf carries out experimental test, while increase damping structure number,
Apply frictional damping effect, repeat step 1 to the high direction multiple spot of leaf) to step 4), and record data and corresponding blade shake shape
Figure；
7) frictional damping normal pressure, damping structure are analyzed and applies height, exciting rod height, exciting force size, friction structure
Contact surface size draws response curve for the impact of the blade vibration characteristic.
Compared with prior art, it is an advantage of the current invention that：
A kind of damping structure of the present invention optimizes blade testing experimental bench：(1) present invention can be by changing damper position
Simulation shroud, lashing wire damping structure and many lashing wire damping structure vanes, especially for the longer of many lashing wire damping structures of exploitation
Developed by leaf has guiding significance；(2) by changing damper quantity, it can be estimated that different damping device quantity is shaken for blade
The impact of dynamic characteristic；(3) each damper normal pressure is variable and can be measurement；(4) dampers contact area be can
Become, and its contact area can be calculated with reference to normal pressure and damper geometric parameter；(5) respectively by changing damping
Device position, normal pressure and contact area, can realize for blade damping structure optimizes from mechanism；(6) compared to other leaves
The design formed blades that piece damping experimental bench is used, experimental bench of the present invention adopts flat board prismatic blade model with leaf model, mainly
Reference is provided for more linear leaf of the exploitation with many lashing wire damping structures.
A kind of damping structure of the present invention optimizes the experimental technique of blade testing experimental bench：(1) by preceding material characteristic basis
Research and the research of blade damping structure combine, and the optimization to blade damping structure is realized from mechanism；(2) blade is scanned with leaf
Piece top offset maximum point carries out blade optimization for Optimal Parameters；(3) based on testing, Binding experiment data are carried out final data
Optimization, real-time matching numerical result, it is ensured that optimization precision；(4) data fitting is carried out to experimental result, can be quick
The optimal damper parameter for adapting to blade vibration characteristic is found out exactly；(5) to be mainly used in dry damping structure excellent for experimental result
Change, for more linear leaf of the exploitation with many lashing wire structures foundation is provided.
In sum, the present invention adopts variable position, normal pressure and contact area damping structure, by changing damper
Put, simulate respectively existing frequently with damping shroud, lashing wire structure blade and more high-power longer many lashing wire damping structure vanes.
The present invention have studied respectively diverse location, different normal pressures and different contacts area for the impact of blade vibration characteristic, be new
Exploitation damping vane provides foundation and the longer many lashing wire structure blades of development point the direction.
Description of the drawings
Fig. 1 is the stereogram that damping structure optimizes blade testing experimental bench；
Fig. 2 is the front view that damping structure optimizes blade testing experimental bench；
Fig. 3 is base frame schematic diagram, wherein, Fig. 3 (a) is its front view, and Fig. 3 (b) is its left view；
Fig. 4 is leaf model schematic diagram to be measured；
Fig. 5 is blade root fixing device and load applying mechanism schematic diagram；
Fig. 6 is blade damping structure schematic diagram；
Fig. 7 is exciter support structural representation.
In figure：1- base plates；2- side plates；3- cushion blocks；The straight troughs of 4- first；5- blade roots；6- blades；7- medial launders；8- blade root slots；
9- fastening bolts；10- blade draw-in grooves；11- frictional damping blocks；12- ball disks；13- loads nut；14- static force sensors；15-
Damping frame；16- exciter support flat boards；17- support deep-slotted chip breakers；18- straight panels；19- flat boards；The straight troughs of 20- second；21- vibrators.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further illustrated.
Referring to Fig. 1 and Fig. 2, it is contemplated that carrying out damping structure optimization performance test to turbine damper blade, it is based on
This purpose, devises a set of by base frame, blade root fixing device, damping structure device, exciting charger and measurement apparatus
The damping structure optimization blade testing experimental bench of composition.
Referring to Fig. 3, the base frame to testing first is introduced.Test-bed is by base plate 1 and is welded thereon face
Two blocks of side plates 2 are constituted, and two cushion blocks 3 are welded on side plate, for fastening blade root fixing device.Base plate 1 is positioned on basic platform,
The upper surface of blade root slot 8 is adjacent to the lower surface of cushion block 3, and three-dimensional laser vialog support is bolted on base plate 1.Each side
The first straight trough 4 is provided with plate 2, for fixing damping structure device and exciter apparatus.First straight trough 4 is carved with scale on edge,
To facilitate adjustment damping structure device and exciter support position.
Referring to Fig. 4, test adopts flat board prismatic blade model with blade.Blade is made up of blade root 5 and blade 6, centre position
Medial launder 7 is provided with, shroud is simulated with lashing wire structure by damping structure device.In test process, blade root 5 and blade root slot 8 are tight
Contiguity is touched and compressed, and the lower end of blade root 5 is acted on by the load on the vertical direction of fastening bolt 9, to simulate blade actual moving process
In the centrifugal force load that is subject to.Blade 6 adopts flat board prismatic blade model, vertical direction blade section all same, damping structure
Device can Yan Yegao directions move up and down；The size of blade 6 matches with damping structure center draw-in groove size, the size of medial launder 7
It is consistent with draw-in groove internal tooth, ensure that blade does not produce displacement on the left and right directions of damping structure active position.
Referring to Fig. 5, blade root fixing device is made up of blade root slot 8 and fastening bolt 9.In process of the test, blade root 5 is embedded in blade root
In the middle blade root slot of groove 8, while blade root slot 8 is because by jack, straight up power is acted on, its upper surface and the following table of cushion block 3
Face is close to, and fastening bolt 9 holds out against the lower surface of blade root 5, and the load that can be applied to blade root 5 straight up by its rotation is acted on,
Centrifugal action suffered by blade root in simulate true operation process, screwing degree by control fastening bolt 9 can control to leaf
The size of the radial load of root 5.
Referring to Fig. 6, the damping structure can be realized applying specified location blade the frictional damping perpendicular to direction blade
Effect, and contact area size and normal pressure size can be changed.Damping structure by damping frame 15, static force sensor 14,
Loading nut 13, ball disk 12 and frictional damping block 11 are constituted, and centre position forms blade draw-in groove 10 by bolt arrangement strap.
In the course of the work, the both sides elongation bar of damping frame 15 is embedded in the first straight trough 4 on side plate 2, can prolong the direction of the first straight trough 4
Move up and down, its position is fixed by nut；Blade 6 is nested in blade draw-in groove 10, the center tooth of draw-in groove 10 it is embedding with blade in the middle of
In groove 7, it is ensured that blade does not produce left and right displacement in process of the test in damping structure position；Ball disk 12 and frictional damping block 11
Between for point contact, ball disk 12 is designed with different size model, under identical positive pressure, changes the model of ball disk 12 and just can
Change contact surface size between ball disk 12 and frictional damping block 11；The one end of static force sensor 14 screws in screw rod and is fixed on damping
On frame 15；Its other end is connected by another screw rod with frictional damping block 11, and loading nut 13 is positioned on the screw rod, is rotated
Loading nut 13 just can apply the load effect in different size of vertical vane direction to blade, simultaneously as screw rod revolves
Tightly in static force sensor 14, loading the rotation of nut 13 will drive screw rod to produce corresponding tension, and its big I is by quiet
State force snesor 14 is determined.
Referring to Fig. 7, vibrator 21 is fixed on exciter support, and exciter support is by exciter support flat board 16 and vertically
Constitute in the straight panel 18 of blade surface.In process of the test, straight panel 18 is fixed on a certain height position on side plate 2 by bolt arrangement
Put, generally 70% leaf high position.Support deep-slotted chip breaker 17 is provided with exciter support flat board 16, for the level of adjusting vibration exciter 21
The angle in direction, vibrator 21 is fixed on flat board 19, and the second straight trough 20 is provided with flat board 19, for adjusting stretching for vibrator 21
Go out length.It is connected by exciting rod between vibrator 21 and blade, dynamic force snesor is placed in the middle of exciting rod to be used to measure
Exciting force size.
A kind of damping structure of the present invention optimizes the experimental technique of blade testing experimental bench, comprises the following steps：
1) base frame is placed on basic platform, according to measurement demand, select the model of ball disk 12 to be measured and target to apply
Damping position, installs successively blade root fixing device, blade to be measured, damping structure device, exciting charger, three-dimensional laser vibration measuring
Instrument and connection data acquisition unit；Ensure that blade root 5 is nested in blade root slot 8, blade 6 is nested in the blade of damping structure device
In draw-in groove 10, exciting rod top is adjacent to blade surface to be measured, screw everywhere bolt with each part position of fixation test platform；
2) adjustment loading nut 13 position, adjusts normal pressure size between frictional damping block 11 and ball disk 12, its concrete number
According to being obtained by the measurement of static force sensor 14, while ensureing the model of blade both sides balls disk 12 and the frictional damping of same leaf high position
Normal pressure is equal in magnitude；Adjustment vibrator 21 position, applies in vertical direction exciting effect, exciting force size to blade surface
With excited frequency the dynamic force sensor measuring in exciting rod centre position is obtained by data acquisition unit；
3) log-on data harvester and vibrator 21, after blade vibration is in stable condition, start three-dimensional laser vialog
Blade body vibration situation is scanned, while recording the model of ball disk 12, frictional damping normal pressure, damping structure applies high
Degree, exciting rod height and exciting force size；
4) loading nut 13 position, the model of ball disk 12, the frequency of vibrator 21, exciter support height and resistance are changed respectively
Buddhist nun's constructional device height, with control frictional damping normal pressure, frictional damping contact area, exciting force size, excitation force frequency, swash
Power of shaking applies position and frictional damping effect applies the change of position, repeat step 2) to step 3), and record data and phase
The blade answered shakes shape figure；
5) frictional damping normal pressure, damping structure are analyzed and applies height, exciting rod height, exciting force size, friction structure
Contact surface size draws response curve for the impact of blade vibration characteristic；
6) use instead compared with step 1) the longer leaf model of Leaf carries out experimental test, while increase damping structure number,
Apply frictional damping effect, repeat step 1 to the high direction multiple spot of leaf) to step 4), and record data and corresponding blade shake shape
Figure；
7) frictional damping normal pressure, damping structure are analyzed and applies height, exciting rod height, exciting force size, friction structure
Contact surface size draws response curve for the impact of the blade vibration characteristic.
In order to further appreciate that to the present invention, now an explanation is done to its operation principle.
In the present invention blade to be measured is fixed in blade root slot 8 by blade root 5, and blade root slot 8 is by jack power straight up
Effect, its upper surface is close to the cushion block 3 being welded on side plate, and fastening bolt 9, fastening bolt 9 and the bottom of blade root 5 are installed in its lower end
Face directly contact, can be changed to blade vertical direction magnitude of load to be measured, to simulate different rotating speeds by rotational fastener bolt 9
Under operating condition, the change of centrifugal force suffered by blade to be measured.Blade to be measured adopts flat board prismatic blade model, blade surface centre bit
Medial launder 7 is put out, in damping position is applied, blade is fixed in the blade draw-in groove 10 of damping structure, in case uppermost leaf piece or so is moved
It is dynamic.
Damper restriction structure is set in blade and blade high direction diverse location, to simulate shroud and lashing wire to the damping of blade about
Shu Zuoyong.Damping structure is fixed on stand side plate 2 by fastening bolt, the first straight trough 4 is provided with stand side plate, for adjusting
Damping structure height, to determine that optimal damper applies position and adapts to the blade of different length；The left and right sides of blade draw-in groove 10
The structure of ball disk 12 is connected by point contact with frictional damping block 11, and damping structure can be changed to leaf by rotation loading nut 13
Magnitude of load on piece left and right directions, its normal pressure is transferred to both sides static force sensor 14 by screw rod, and is sensed by static force
Device 14 determines its power size；Meanwhile, the ball disk 12 being joined directly together with blade draw-in groove 10 is provided with different size model, to study difference
Contact area is for the impact of damping action.
Vibrator 21 is fixed on stand side plate 2 by support, typically in 70% right position of blade height, by swashing
The bar that shakes applies the exciting force perpendicular to blade surface, places dynamic force snesor in exciting rod centre position big to determine exciting force
It is little.Exciting rod makes thin rod portion under its own flexibility effect using the thick middle thin variable section structure in two ends, can fully disappear
Circumferential load produced by consumption vibrator, it is ensured that blade is only vibrating on blade surface direction.It is the same with damping structure,
The height of vibrator also can be regulation, to adapt to the blade of different length.
The vibratory response of blade is measured by the three-dimensional laser vialog being fixed on support, by data acquisition system
System obtains blade vibration characteristic parameter.
Claims (5)
1. a kind of damping structure optimizes blade testing experimental bench, it is characterised in that：Including base frame, blade root fixing device, resistance
Buddhist nun's constructional device and exciting charger；Wherein,
Base frame includes base plate (1) and two side plates (2) being symmetrically welded on base plate (1), and the inner side of two side plates (2) is right
Title is welded with vertically to be gone up on two cushion blocks (3), and two side plates (2) symmetrically offer some first straight troughs (4)；
Blade root fixing device includes blade root slot (8) and fastening bolt (9), and the centre of blade root slot (8) offers to be measured for being embedded in
The groove of blade root (5), is provided with the fastening bolt (9) for applying load straight up to blade root (5) below groove；
Damping structure device includes the blade draw-in groove (10) for fixing blade blade (6) to be measured, the two ends of blade draw-in groove (10)
A ball disk (12) is respectively arranged with, each ball disk (12) is contacted respectively with symmetrically arranged two frictional damping blocks (11) point,
Each frictional damping block (11) is separately positioned on one end of a damping frame (15), and by screw rod and loads nut (13) and set
The static force sensor (14) put on the damping frame (15) is connected, and the other end of each damping frame (15) is embedded in by elongation bar
In the first straight trough (4) in correspondence side plate (2), can move up and down along the direction of the first straight trough (4), and it is fixed by nut
Position；
Exciting charger includes exciter support flat board (16) and is symmetricly set on two straight panels (18) of its both sides, and two straight
Plate (18) is bolted on respectively on two side plates (2), and some support deep-slotted chip breakers are provided with exciter support flat board (16)
(17), vibrator (21) is fixed on flat board (19), and the second straight trough (20) is provided with flat board (19), and flat board (19) is arranged on exciting
On device support plate (16), and vibrator (21) adjusts its angle in the horizontal direction by some support deep-slotted chip breakers (17), leads to
Cross the second straight trough (20) and adjust its extension elongation；Contacted by exciting rod between vibrator (21) and blade to be measured, exciting
The dynamic force snesor for measuring blade exciting force size to be measured is placed with the middle of bar；
The test experimental bed includes two sets of damping structure devices；
It is carved with first straight trough (4) edge upper in two side plates (2) for adjusting damping structure device and exciting charger
The scale put.
2. a kind of damping structure according to claim 1 optimizes blade testing experimental bench, it is characterised in that：Two side plates
(2) vertically go up on and respectively offer 6 the first straight troughs (4).
3. a kind of damping structure according to claim 1 optimizes blade testing experimental bench, it is characterised in that：Exciting rod is adopted
Thin variable section structure in the middle of two ends are thick.
4. a kind of damping structure any one of claims 1 to 3 optimizes the experimental technique of blade testing experimental bench, and it is special
Levy and be, comprise the following steps：
1) base frame is placed on basic platform, according to measurement demand, select ball disk (12) model to be measured and target to apply resistance
Buddhist nun position, installs successively blade root fixing device, blade to be measured, damping structure device, exciting charger, three-dimensional laser vialog
And connection data acquisition unit；Ensure that blade root (5) is nested in blade root slot (8), blade (6) is nested in damping structure device
In blade draw-in groove (10), exciting rod top is adjacent to blade surface to be measured, screw everywhere bolt with each part position of fixation test platform；
2) adjustment loading nut (13) position, adjusts normal pressure size between frictional damping block (11) and ball disk (12), and its is concrete
Data are obtained by static force sensor (14) measurement, while ensureing blade both sides ball disk (12) model of same leaf high position and rubbing
Wipe damping normal pressure equal in magnitude；Adjustment vibrator (21) position, applies in vertical direction exciting effect to blade surface, swashs
Power of shaking size is obtained by data acquisition unit with excited frequency to the dynamic force sensor measuring in exciting rod centre position；
3) log-on data harvester and vibrator (21), after blade vibration is in stable condition, start three-dimensional laser vialog pair
Blade body vibration situation is scanned, while record ball disk (12) model, frictional damping normal pressure, damping structure device applying
Highly, exciting rod height and exciting force size；
4) loading nut (13) position, ball disk (12) model, vibrator (21) frequency, exciter support plate height are changed respectively
And damping structure device height, to control frictional damping normal pressure, frictional damping contact area, exciting force size, exciting force
Frequency, exciting force apply position and frictional damping effect applies the change of position, repeat step 2) to step 3), and record number
According to shaking shape figure with corresponding blade；
5) frictional damping normal pressure, damping structure device are analyzed and applies height, exciting rod height, exciting force size, friction structure
Contact surface size draws response curve for the impact of blade vibration characteristic.
5. a kind of damping structure according to claim 4 optimizes the experimental technique of blade testing experimental bench, it is characterised in that
It is further comprising the steps of：
6) use instead compared with step 1) the longer leaf model of Leaf carries out experimental test, while increase damping structure device number,
Apply frictional damping effect, repeat step 1 to the high direction multiple spot of leaf) to step 4), and record data and corresponding blade shake shape
Figure；
7) frictional damping normal pressure, damping structure device are analyzed and applies height, exciting rod height, exciting force size, friction structure
Contact surface size draws response curve for the impact of the blade vibration characteristic.
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