CN109374209A - A kind of Rotor Low-speed Dynamic platform and critical speed prediction technique - Google Patents
A kind of Rotor Low-speed Dynamic platform and critical speed prediction technique Download PDFInfo
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Abstract
The embodiment of the present application discloses a kind of Rotor Low-speed Dynamic platform and critical speed prediction technique, and Rotor Low-speed Dynamic platform includes base support, rubber cushion blocks, bearing block, the bearing for setting up rotor to be measured, key phase, vibrating sensor, motor, data collecting instrument and computer for driving rotor rotation to be measured；Structure based on above-mentioned Rotor Low-speed Dynamic platform, establish Rotor Low-speed Dynamic platform system first critical speed prediction model, pass through the first critical speed prediction model, the relationship between rubber cushion blocks size and first critical speed can be found, whether meet the requirement of low-speed balancing test so as to the first critical speed of the good Rotor Low-speed Dynamic platform system of look-ahead system building, without rubber cushion blocks are installed on after above-mentioned low-speed balancing platform preliminary operation repeatedly and dismounting adjustment rubber cushion blocks, reach and quickly searches out suitable support stiffness, the purpose of fast construction scene Rotor Low-speed Dynamic platform.
Description
Technical field
This application involves fired power generating unit mechanical oscillation field, more specifically to a kind of Rotor Low-speed Dynamic platform and
Critical speed prediction technique.
Background technique
Rotor dynamic balancing is a research contents of rotor dynamics, and imbalance can cause the vibration values of rotor to increase, no
Conducive to rotor normal operation.So for there are the rotors of mass unbalance should carry out dynamic balance treatment.Machine manufacture or
In maintenance, dynamic balancing becomes a procedure.
Often the duration is nervous for unit maintenance, while expending the factors such as higher cost in order to avoid rotor returns factory, usually selects
Dynamic balance bench is built at the scene carries out Rotor Low-speed Dynamic test.The balancing speed control of general the low speed dynamic balance at field test
In 250r/min or so or more lower, thus the single order for significantly appearing dynamic balance bench system under this balancing speed is required to face
Boundary's revolving speed has appropriate sensitivity to unbalance to obtain rotor on low-speed balancing platform.This sensitivity to unbalance is logical
It crosses the support stiffness of adjustment dynamic balance bench to realize, its essence is adjustment support stiffness to obtain suitable dynamic balance bench system
First critical speed (generally takes 120r/min~150r/min), to meet the condition for implementing dynamic balance running at the scene.
Currently, scene frequently with rubber pad low-speed balancing platform, is the original dimension for rule of thumb designing rubber cushion blocks
Low-speed balancing platform is set up, subsequent motor drag rotor carries out preliminary operation.If dynamic balance bench system cannot obtain in boosting velocity procedure
To expected first critical speed (excessively high, too low all bad), then need shutdown to remove rubber cushion blocks and re-start rubber cushion blocks
Size adjusting reinstalls to rubber cushion blocks adjusted on dynamic balance bench.It is generally necessary to which repeatedly adjusting can just be finally reached
The demand of the low speed dynamic balance at field test.And the process CIMS of scene dismounting rubber cushion blocks is complicated, frequent dismounting adjustment rubber
Cushion block not only expends a large amount of manpower and material resources, also can not good control to the duration at scene.
Therefore, suitable support stiffness how is quickly searched out, fast construction the low speed dynamic balance at field platform is asked as key
Topic.
Summary of the invention
The purpose of the application is to provide a kind of Rotor Low-speed Dynamic platform and critical speed prediction technique, to overcome existing skill
Technical problem present in art.
To achieve the above object, this application provides following technical solutions:
A kind of Rotor Low-speed Dynamic platform system critical speed prediction technique, Rotor Low-speed Dynamic platform include: pedestal branch
Frame, the rubber cushion blocks for adjusting the Rotor Low-speed Dynamic platform support stiffness, bearing block, the axis for setting up rotor to be measured
Hold, the vibrating sensor for measuring vibration, the key phase for measuring revolving speed, for driving the rotor to be measured rotation
Motor, data collecting instrument and computer；Wherein, the rubber cushion blocks be mounted on the base support and the bearing block it
Between, the bearing is mounted on the bearing block, and the key phase is mounted on the axial edge of the bearing, the vibration
Sensor is mounted on the bearing block；The data collecting instrument is connect with the key phase and the vibrating sensor；
The computer is connect with the data collecting instrument；The rubber cushion blocks include: the non-driven-end bearing rubber pad of the motor
Block, drive end bearing rubber cushion blocks；The described method includes:
If calculating separately rubber cushion blocks applied to the Rotor Low-speed Dynamic platform, the Rotor Low-speed Dynamic platform it is non-
Drive end bearing rubber cushion blocks stiffness coefficient, drive end bearing rubber cushion blocks stiffness coefficient；
The first critical speed that the stiffness coefficient being calculated input is established based on the Rotor Low-speed Dynamic platform is pre-
Model is surveyed, the first critical speed of the low-speed balancing platform system is obtained.
The above method, it is preferred that the mistake of first critical speed prediction model is established based on the Rotor Low-speed Dynamic platform
Journey includes:
It obtains based on equation of rotor motion to be measured obtained from the Rotor Low-speed Dynamic platform structure:
Wherein, l1Indicate the mass center of rotor to be measured to the distance at non-driven-end bearing rubber cushion blocks center；l2Indicate to
Distance of the survey rotor centroid to drive end bearing rubber cushion blocks center；k1Indicate the non-drive of the Rotor Low-speed Dynamic platform
Moved end bearing rubber cushion blocks stiffness coefficient；k2Indicate the drive end bearing rubber cushion blocks rigidity system of the Rotor Low-speed Dynamic platform
Number；c1Indicate the damped coefficient of the non-driven-end bearing rubber cushion blocks；c2Indicate the damping of the drive end bearing rubber cushion blocks
Coefficient；M indicates the quality of the rotor to be measured；JGIndicate the rotary inertia of the rotor to be measured；X indicates the rotor to be measured
Displacement；The degree of raising of θ expression shaft；F indicates the elastic restoring force of rotor to be measured；ω indicates the angular speed of rotor to be measured；
The first critical speed prediction model is obtained according to the characteristic equation of the equation of rotor motion to be measured.
The above method, it is preferred that the characteristic equation according to the equation of rotor motion to be measured obtains the single order and faces
Boundary's rotor speed forecast model, comprising:
The characteristic equation of the equation of rotor motion to be measured is obtained according to dynamic matrix D；Wherein,
k11=k1+k2, k12=-k1l1+k2l2, k21=-k1l1+k2l2,
The characteristic equation are as follows:
|D-ω2I |=0；
It is obtained according to the characteristic equation
First critical speed prediction model f1Are as follows:
A kind of Rotor Low-speed Dynamic platform, comprising:
Base support；
For adjusting the rubber cushion blocks of the Rotor Low-speed Dynamic platform support stiffness；
Bearing block；
For setting up the bearing of rotor to be measured；
For measuring the key phase of revolving speed；
For measuring the vibrating sensor of vibration；
For driving the motor of the rotor rotation to be measured；
Data collecting instrument and computer；
Wherein, the rubber cushion blocks are mounted between the base support and the bearing block, and the bearing is mounted on institute
It states on bearing block, the key phase is mounted on the axial edge of the bearing, and the vibrating sensor is mounted on the axis
It holds on seat；The data collecting instrument is connect with the key phase and the vibrating sensor；The computer and the number
It is connected according to Acquisition Instrument；The rubber cushion blocks include: the non-driven-end bearing rubber cushion blocks of the motor, drive end bearing rubber pad
Block.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that the quantity of the vibrating sensor is 2~4.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that 2~4 vibrating sensors are arranged in same level not
Same position.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that the non-driven-end bearing rubber cushion blocks include N number of sub- rubber pad
Block, the drive end bearing rubber cushion blocks include P sub- rubber cushion blocks, and the N and P are the positive integer greater than 1.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that the bearing is half circular journal bearing.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that the base support is connect by fixing bolt with concrete pedestal.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that further include:
Oil dripping tube, the oil dripping tube are located at the top of the bearing, the lubricating oil of the oil dripping tube drippage for it is described to
Survey the lubrication between rotor and the bearing.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that the motor and the rotor to be measured are connected by gear or universal joint
It connects.
Above-mentioned Rotor Low-speed Dynamic platform, it is preferred that the motor is the motor braked by salt bath principle.
By above scheme it is found that a kind of Rotor Low-speed Dynamic platform provided by the present application and critical speed prediction technique,
Rotor Low-speed Dynamic platform includes base support, the rubber cushion blocks for adjusting Rotor Low-speed Dynamic platform support stiffness, bearing
Seat, the bearing for setting up rotor to be measured, key phase, vibrating sensor, motor, number for driving rotor rotation to be measured
According to Acquisition Instrument and computer；Wherein, rubber cushion blocks are mounted between base support and bearing block, and bearing is mounted on bearing block,
Key phase is mounted on the axial edge of bearing, and vibrating sensor is mounted on bearing block；Data collecting instrument is mutually sensed with key
Device, vibrating sensor connection are connected with computer；Rubber cushion blocks include: the non-driven-end bearing rubber cushion blocks of motor, drive end
Bearing rubber cushion blocks.Based on the structure of above-mentioned Rotor Low-speed Dynamic platform, the single order of Rotor Low-speed Dynamic platform system is established
Critical speed prediction model, and since the support stiffness of Rotor Low-speed Dynamic platform and the size of rubber cushion blocks are related, lead to
The first critical speed prediction model is crossed, the relationship between rubber cushion blocks size and first critical speed can be found, so as to
Whether the first critical speed of the good Rotor Low-speed Dynamic platform system of look-ahead system building meets wanting for dynamic balance running
It asks, carries out preliminary operation repeatedly and dismounting adjustment rubber pad without rubber cushion blocks are installed on after above-mentioned low-speed balancing platform
Block achievees the purpose that quickly to search out suitable support stiffness, fast construction scene Rotor Low-speed Dynamic platform.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of Rotor Low-speed Dynamic platform provided by the embodiments of the present application；
Fig. 2 is the right view of Rotor Low-speed Dynamic platform shown in Fig. 1；
Fig. 3 is a kind of implementation flow chart provided by the embodiments of the present application for obtaining first critical speed prediction model；
Fig. 4 is the mathematics computing model of Rotor Low-speed Dynamic platform provided by the embodiments of the present application；
Fig. 5 is the mathematics computing model of simplified Rotor Low-speed Dynamic platform provided by the embodiments of the present application；
Fig. 6 is a kind of realization of Rotor Low-speed Dynamic platform system critical speed prediction technique provided by the embodiments of the present application
Flow chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative labor
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is a kind of structural representation of Rotor Low-speed Dynamic platform provided by the embodiments of the present application
Figure, Fig. 2 are the right view (section components in Fig. 1 are only shown in 2 in figure) of Rotor Low-speed Dynamic platform shown in Fig. 1, the rotor
Low-speed balancing platform may include:
Base support 1, rubber cushion blocks 2, bearing block 3, bearing 4, oil dripping tube 5, fixing bolt 6, motor 7 (do not show in Fig. 1
Out), vibrating sensor 8, key phase 9, data collecting instrument 10 and computer 11；
Wherein, rubber cushion blocks 2 are mounted between base support 1 and bearing block 3.The support stiffness of Rotor Low-speed Dynamic platform
It is adjusted by rubber cushion blocks 2.By adjusting the size of rubber cushion blocks 2, thus it is possible to vary the bearing of Rotor Low-speed Dynamic platform is rigid
Degree.
Bearing 4 is mounted on bearing block 3, and bearing 4 is for setting up rotor to be measured, and bearing 4 is half circular journal bearing.
Vibrating sensor 8, for measuring bearing shell vibration.Vibrating sensor 8 is mounted on bearing block 3, and optionally, vibration passes
Sensor 8 may be mounted at side parallel with the axis of bearing 4 on bearing block 3.
Key phase 9 is mounted on the axial edge of bearing 4, for measuring the revolving speed of rotor to be measured.
Motor 7 is connect with rotor to be measured, for driving rotor to be measured to rotate.
Data collecting instrument 10 is used to acquire the data of key phase 9 and vibrating sensor 8, and transfers data to calculating
Machine 11, in order to monitor the first critical speed of bearing shell vibration and Rotor Low-speed Dynamic platform system.
Wherein, rubber cushion blocks 2 include two parts, are respectively as follows: the non-driven-end bearing rubber cushion blocks of motor 7, drive end axle
Hold rubber cushion blocks.
Optionally, vibrating sensor 8 can be set multiple, such as can be set 2~4, and multiple vibrating sensor 8 divides
Cloth is arranged on the bearing block of non-driven-end bearing and the bearing block of drive end bearing in same level.
Optionally, non-driven-end bearing rubber cushion blocks may include N number of sub- rubber cushion blocks, and drive end bearing rubber cushion blocks can
To include P sub- rubber cushion blocks, P and N are integer, and P and N may be the same or different.
Optionally, base support 1 can be connect by fixing bolt 6 with concrete pedestal, and base support 1 is fixed on water
On the basis of mud.
Optionally, oil dripping tube 5 is located at the top of bearing 4, and the lubricating oil that oil dripping tube 5 drips is used for rotor to be measured and bearing 4
Between lubrication.
Optionally, motor 7 is braked by salt bath principle, i.e., motor 7, which can be, is braked by salt bath principle
Motor.
Optionally, it can be connected by gear or universal joint between rotor and motor 7 to be measured, i.e., rotor to be measured is by motor
7 pass through gear or universal joint drive.
Based on above-mentioned Rotor Low-speed Dynamic platform, the single order that the application provides a kind of Rotor Low-speed Dynamic platform system is critical
Rotor speed forecast model.Specifically, a kind of implementation flow chart such as Fig. 3 provided by the present application for obtaining first critical speed prediction model
It is shown, may include:
Step S31: it obtains based on Rotor Low-speed Dynamic platform structure and obtains equation of rotor motion to be measured.
In the embodiment of the present application, the mathematics computing model of above-mentioned Rotor Low-speed Dynamic platform is as shown in figure 4, above-mentioned to obtain
Equation of rotor motion to be measured, mathematics computing model shown in Fig. 4 is simplified, the Rotor Low-speed Dynamic platform after being simplified
Mathematics computing model, as shown in Figure 5, wherein X indicates a reference direction.
The matrix form of the equation of rotor motion to be measured specifically obtained is as follows:
Wherein, l1Indicate the mass center G of rotor to be measured to the distance at non-driven-end bearing rubber cushion blocks center；l2It indicates
Distance of the rotor centroid G to be measured to drive end bearing rubber cushion blocks center；k1Indicate the Rotor Low-speed Dynamic platform
Non-driven-end bearing rubber cushion blocks stiffness coefficient；k2Indicate that the drive end bearing rubber cushion blocks of the Rotor Low-speed Dynamic platform are rigid
Spend coefficient；c1Indicate the damped coefficient of the non-driven-end bearing rubber cushion blocks；c2Indicate the drive end bearing rubber cushion blocks
Damped coefficient；M indicates the quality of the rotor to be measured；JGIndicate the rotary inertia of the rotor to be measured；X indicates described to be measured turn
The displacement of son；The degree of raising of θ expression shaft；F indicates the elastic restoring force of rotor to be measured；ω indicates the angular speed of rotor to be measured.
Step S32: first critical speed prediction model is obtained according to the characteristic equation of above-mentioned equation of rotor motion to be measured.
To define dynamic matrix D convenient for calculating:
Wherein, k11=k1+k2, k12=-k1l1+k2l2, k21=-k1l1+k2l2,
Obtain characteristic equation are as follows:
|D-ω2I |=0, it may be assumed that (ω2M-k11)(ω2JG-k22)+k12×k21=0；
It is obtained according to features described above equation:
Then, first critical speed prediction model f1Are as follows:
Second order critical speed prediction model is f2Are as follows:
Based on foregoing rotor low-speed balancing platform and first critical speed prediction model, the application provides a kind of rotor low speed
Dynamic balance bench system critical speed prediction technique, a kind of realization of the Rotor Low-speed Dynamic platform system critical speed prediction technique
Flow chart is as shown in fig. 6, may include:
Step S61: if calculating separately rubber cushion blocks applied to Rotor Low-speed Dynamic platform, Rotor Low-speed Dynamic platform it is non-
Drive end bearing rubber cushion blocks stiffness coefficient, drive end bearing rubber cushion blocks stiffness coefficient.
That is, the application is before rubber cushion blocks are applied to Rotor Low-speed Dynamic platform, if first calculating rubber
Rubber mat block be applied to Rotor Low-speed Dynamic platform, the non-driven-end bearing rubber cushion blocks stiffness coefficient of Rotor Low-speed Dynamic platform,
Drive end bearing rubber cushion blocks stiffness coefficient can be how many.
Specifically how to calculate non-driven-end bearing rubber cushion blocks stiffness coefficient, drive end bearing rubber cushion blocks stiffness coefficient category
Common knowledge in this field, which is not described herein again.
Step S62: the above-mentioned stiffness coefficient being calculated is inputted into aforementioned first critical speed prediction model, obtains rotor
The first critical speed of low-speed balancing platform system.
According to the first critical speed, in conjunction with actual testing requirement, tester can determine low to be applied to rotor
Whether the rubber cushion blocks of quick-action balancer meet the condition for implementing low-speed balancing test.Specifically, if the first critical speed
It is less than preset threshold with the difference of the first critical speed of actual demand, it is believed that meet the item for implementing low-speed balancing test
Part, otherwise it is assumed that being unsatisfactory for implementing the condition of low-speed balancing test.How much specific threshold value can be according to actual precision need if being
Ask determining.If actual accuracy requirement is higher, threshold value can be smaller, if actual accuracy requirement is lower, threshold value can be with
It is larger.
If it is determined that the above-mentioned rubber cushion blocks to be applied to Rotor Low-speed Dynamic platform are unsatisfactory for implementing low-speed balancing test
Condition reuse critical speed prediction technique shown in fig. 6 prediction rotor low speed then after the size of modification rubber cushion blocks
The first critical speed of dynamic balance bench system, until meeting the condition for implementing low-speed balancing test.
The embodiment of the present application is explained below with reference to concrete case.
For example, certain Turbo-generator Set has been surprisingly found that 13 pressure stages of some turbine rotor when taking off cylinder cleaning foreign matter
There are 3 leaf destructions, 15 pressure stages there are 2 leaf destructions, after being replaced to the blade of damage, in order to eliminate replacement leaf
Rotor imbalance caused by piece carries out low-speed balancing processing to the rotor after replacement blade.In the low-speed balancing treatment process,
Rubber cushion blocks 2 are the rubber cushion blocks of bar shaped, and specific design is as shown in table 1:
Table 1
| Project | Unit | The high-pressure side of rotor | The low-pressure side of rotor |
| Cross dimensions | m | 0.08×0.065 | 0.08×0.065 |
| Arrangement form | 2 layers × 3 row × 2 group | 2 layers × 4 row × 2 group | |
| Effective contact area | m | 0.1464 | 0.2048 |
| Decrement | m | 0.0817 | 0.0633 |
| Dead weight | kN | 67 | 78 |
| Than pressure | N/m2(Pa) | 4.58×105 | 3.81×105 |
| Stiffness coefficient | N/m | 8.2×105 | 1.232×106 |
Wherein, cross dimensions refers on rubber cushion blocks, perpendicular to the plane of rotor axial to be measured；Effective contact area refers to
Contact area between rubber cushion blocks and bearing block.
According to first critical speed prediction model provided by the present application, f can be obtained1It is dynamic to be equivalent to rotor low speed by=1.875Hz
The first critical speed of balancer system are as follows: 1.875 × 60=113r/min.
The one of dynamic balance bench system can be carried out by " self-vibration method " based on Rotor Low-speed Dynamic platform provided by the present application
The test of rank critical speed, below by the first critical speed of " self-vibration method " test Rotor Low-speed Dynamic platform system:
Above-mentioned rotor is erected on the bearing of Rotor Low-speed Dynamic platform, is unclamped in the middle part of Manual-pushing rotor and rapidly,
Make its rotation, is by the first critical speed that the data that data collecting instrument 10 acquires obtain Rotor Low-speed Dynamic platform system
124r/min。
Below by its first critical speed of Rotor Low-speed Dynamic platform system testing:
After above-mentioned rotor is erected on the bearing of Rotor Low-speed Dynamic platform, starting motor drives rotor rotation, passes through
The first critical speed that the data that data collecting instrument 10 acquires obtain Rotor Low-speed Dynamic platform system is 120r/min.
By above-mentioned data it is found that the first critical speed of Rotor Low-speed Dynamic platform system predicts mould in the embodiment of the present application
Type is feasible.
In conclusion this application provides a kind of Rotor Low-speed Dynamic platform, a kind of Rotor Low-speed Dynamic platform system
First critical speed prediction model carries out Rotor Low-speed Dynamic when needing to be based on Rotor Low-speed Dynamic platform provided by the present application
When test, critical turn of single order of above-mentioned first critical speed prediction model prediction Rotor Low-speed Dynamic platform system can be first passed through
Speed, obtained first critical speed to be predicted builds Rotor Low-speed Dynamic platform when meeting dynamic balance running condition again, thus one
It is secondary to put up the Rotor Low-speed Dynamic platform for meeting dynamic balance running condition, reach and has quickly searched out suitable bearing just
The purpose of degree, fast construction the low speed dynamic balance at field platform.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (12)
1. a kind of Rotor Low-speed Dynamic platform system critical speed prediction technique, which is characterized in that Rotor Low-speed Dynamic platform packet
Include: base support, the rubber cushion blocks for adjusting the Rotor Low-speed Dynamic platform support stiffness, bearing block, for set up to
Survey the bearing of rotor, the vibrating sensor for measure vibration, the key phase for measuring revolving speed, for described in driving to
Survey motor, data collecting instrument and the computer of rotor rotation；Wherein, the rubber cushion blocks are mounted on the base support and described
Between bearing block, the bearing is mounted on the bearing block, and the key phase is mounted on the axial edge of the bearing,
The vibrating sensor is mounted on the bearing block；The data collecting instrument and the key phase and the vibrating sensing
Device connection；The computer is connect with the data collecting instrument；The rubber cushion blocks include: the non-driven-end bearing of the motor
Rubber cushion blocks, drive end bearing rubber cushion blocks；The described method includes:
If calculating separately rubber cushion blocks applied to the Rotor Low-speed Dynamic platform, the Rotor Low-speed Dynamic platform it is non-driven
End bearing rubber cushion blocks stiffness coefficient, drive end bearing rubber cushion blocks stiffness coefficient；
The stiffness coefficient being calculated input is predicted into mould based on the first critical speed that the Rotor Low-speed Dynamic platform is established
Type obtains the first critical speed of the Rotor Low-speed Dynamic platform system.
2. the method according to claim 1, wherein it is critical to establish single order based on the Rotor Low-speed Dynamic platform
The process of rotor speed forecast model includes:
It obtains based on equation of rotor motion to be measured obtained from the Rotor Low-speed Dynamic platform structure:
Wherein, l1Indicate the mass center of rotor to be measured to the distance at non-driven-end bearing rubber cushion blocks center；l2Indicate to be measured turn
Distance of the sub- mass center to drive end bearing rubber cushion blocks center；k1Indicate the anti-drive end of the Rotor Low-speed Dynamic platform
Bearing rubber cushion blocks stiffness coefficient；k2Indicate the drive end bearing rubber cushion blocks stiffness coefficient of the Rotor Low-speed Dynamic platform；c1
Indicate the damped coefficient of the non-driven-end bearing rubber cushion blocks；c2Indicate the damping system of the drive end bearing rubber cushion blocks
Number；M indicates the quality of the rotor to be measured；JGIndicate the rotary inertia of the rotor to be measured；X indicates the position of the rotor to be measured
It moves；The degree of raising of θ expression shaft；F indicates the elastic restoring force of rotor to be measured；ω indicates the angular speed of rotor to be measured；
The first critical speed prediction model is obtained according to the characteristic equation of the equation of rotor motion to be measured.
3. according to the method described in claim 2, it is characterized in that, the feature side according to the equation of rotor motion to be measured
Journey obtains the first critical speed prediction model, comprising:
The characteristic equation of the equation of rotor motion to be measured is obtained according to dynamic matrix D；Wherein,
k11=k1+k2, k12=-k1l1+k2l2, k21=-k1l1+k2l2,
The characteristic equation are as follows:
|D-ω2I |=0；
It is obtained according to the characteristic equation
First critical speed prediction model f1Are as follows:
4. a kind of Rotor Low-speed Dynamic platform characterized by comprising
Base support；
For adjusting the rubber cushion blocks of the Rotor Low-speed Dynamic platform support stiffness；
Bearing block；
For setting up the bearing of rotor to be measured；
For measuring the key phase of revolving speed；
For measuring the vibrating sensor of vibration；
For driving the motor of the rotor rotation to be measured；
Data collecting instrument and computer；
Wherein, the rubber cushion blocks are mounted between the base support and the bearing block, and the bearing is mounted on the axis
It holds on seat, the key phase is mounted on the axial edge of the bearing, and the vibrating sensor is mounted on the bearing block
On；The data collecting instrument is connect with the key phase and the vibrating sensor；The computer is adopted with the data
Collect instrument connection；The rubber cushion blocks include: the non-driven-end bearing rubber cushion blocks of the motor, drive end bearing rubber cushion blocks.
5. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that the quantity of the vibrating sensor is 2
~4.
6. Rotor Low-speed Dynamic platform according to claim 5, which is characterized in that 2~4 vibrating sensors arrangement
In the different location of same level.
7. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that the non-driven-end bearing rubber cushion blocks
Including N number of sub- rubber cushion blocks, the drive end bearing rubber cushion blocks include P sub- rubber cushion blocks, and the N and P are greater than 1
Positive integer.
8. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that the bearing is half circular journal bearing.
9. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that the base support passes through fixing bolt
It is connect with concrete pedestal.
10. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that further include:
Oil dripping tube, the oil dripping tube are located at the top of the bearing, and the lubricating oil of the oil dripping tube drippage is used for described to be measured turn
Lubrication between the sub and described bearing.
11. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that the motor and the rotor to be measured
It is connected by gear or universal joint.
12. Rotor Low-speed Dynamic platform according to claim 4, which is characterized in that the motor is to pass through salt bath principle
The motor braked.
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