CN107389267A - A kind of rotor-support-foundation system dynamic balancing encourages recognition methods - Google Patents
A kind of rotor-support-foundation system dynamic balancing encourages recognition methods Download PDFInfo
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- CN107389267A CN107389267A CN201710563533.4A CN201710563533A CN107389267A CN 107389267 A CN107389267 A CN 107389267A CN 201710563533 A CN201710563533 A CN 201710563533A CN 107389267 A CN107389267 A CN 107389267A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000005284 excitation Effects 0.000 claims abstract description 26
- 238000004088 simulation Methods 0.000 claims abstract description 21
- 230000010355 oscillation Effects 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims abstract description 13
- 238000013016 damping Methods 0.000 claims abstract description 8
- 238000005457 optimization Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000002474 experimental method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000002068 genetic effect Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
- G01M1/22—Determining imbalance by oscillating or rotating the body to be tested and converting vibrations due to imbalance into electric variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0075—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by means of external apparatus, e.g. test benches or portable test systems
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Abstract
A kind of rotor-support-foundation system dynamic balancing encourages recognition methods, carries out measuring, gathers the output of current vortex sensor in rotating shaft, obtains the measured value of rotor oscillation response；Motor stalls, and gathers the geometric parameter and material parameter of rotor-support-foundation system, establishes the FEM model of rotor-support-foundation system；By finite element simulation, the simulation value of rotor oscillation response is obtained；Rotor-support-foundation system dynamic balancing excitation identification object function and optimal model are set；Solution is iterated using optimization algorithm, obtains the initial unbalance, bearing rigidity and damping parameter of rotor-support-foundation system.The inventive method is optimized using simulation result and experimental result, can effectively it be identified by the rotor-support-foundation system dynamic balancing excitation with good robustness and accuracy of identification based on some experimental data, easily use, limited by equipment result and test condition small in practice in engineering.
Description
Technical field
The invention belongs to mechanical oscillation field, particularly a kind of rotor-support-foundation system dynamic balancing excitation recognition methods.
Background technology
The uneven exciting force identification problem of rotating machinery, is closely related with the dynamic balancing theory of rotor-support-foundation system.At present, turn
Sub- dynamic balancing process mainly realizes on dynamic balancing machine, only part ship machinery, such as the large scale equipment such as steam turbine, generator
The technical requirements of spot dynamic balance are had, and to Auxiliary Power Unit, spot dynamic balance operation is seldom carried out, in running
Uneven exciting force also lack effective quantitative analysis means.
Engineering practice shows, the rotor of the vertical mechanical such as motor-driven centrifugal pump, screw pump equipment in the process of running
Imbalance excitation, the vibratory response to under-chassis, which is brought, to be had a strong impact on, it is therefore desirable to the acquisition methods of uneven excitation is explored, to set
Standby vibration and noise reducing provides strong technical support.
For general slewing, balance method main at present has an impact Y-factor method Y, modal balance method, balanced without test mass
Method etc..The shortcomings that influence coefficient method is to need repeatedly additional examination weight, repeatedly starting and stopping to obtain influence coefficient matrix.Such method
Shortcoming is to need have deep understanding to the dynamics of the rotor structure of ready to balance, and the requirement to balance personnel is higher, and
The vibration shape of complex rotor system is complex, is difficult to obtain preferable counterbalance effect, thus is not suitable for the complicated rotor of the vibration shape
System is balanced.During field balancing, available balance correction face number is restricted, and is typically mostly two rectifying planes；Make
Wanting to obtain preferable counterbalance effect with the method must be such that rotor is operated near each rank critical speed.This method is mainly base
Being carried out in the FEM model of rotor-support-foundation system, the precision of model has direct influence to the recognition effect of imbalance excitation, because
This needs to carry out necessary Modifying model to simulation model in advance, emulation is coincide with test model good.
In summary, there is the shortcomings that certain and limitation in various dynamic balance methods.At present, marine electric machine driving from
The vertical pump apparatus such as heart pump, screw pump, deficiency is considered to spot dynamic balance demand, causes balance position and mode can be added serious
Limited, the measurement position of rotor oscillation is also very limited, increases the acquisition difficulty of rotor unbalance exciting force, therefore, uneven
Acquisition, the recognition methods of power and uneven moment of torsion are still the technical barrier of urgent need to resolve.
The content of the invention
It is an object of the invention to provide it is a kind of can accurately obtain out-of-balance force and uneven moment of torsion, robustness it is good turn
Subsystem dynamic balancing encourages recognition methods.
The purpose of the present invention is achieved through the following technical solutions, and is comprised the following steps：
Step 1 installs current vortex sensor in rotating shaft；
Described current vortex sensor is distributed the symmetric position with rotating shaft in pairs；Current vortex sensor has 2~3 pairs；
Step 2 motors are started shooting, and after rotor reaches desired speed and stabilization, gather the defeated of current vortex sensor
Go out, obtain the measured value of rotor oscillation response；
Step 3 motors stall, and gather the geometric parameter and material parameter of rotor-support-foundation system, establish the finite element of rotor-support-foundation system
Model；
Step 4 obtains the simulation value of rotor oscillation response by finite element simulation；
Step 5 sets rotor-support-foundation system dynamic balancing excitation identification object function and optimal model；
Step 6 is iterated solution using optimization algorithm, obtains initial unbalance, the bearing rigidity of rotor-support-foundation system
And damping parameter.
The present invention can also include：
1. measured value that rotor-support-foundation system dynamic balancing excitation identification object function is responded with rotor oscillation and simulation value
The minimum principle of difference.
2. the rotor-support-foundation system dynamic balancing excitation identification optimal model is
Minimize f(Ω,x1,x2,x3)
Subject to xi,L≤xi≤xi,U xi∈ x, i=1,2,3
Wherein, f (Ω, x1,x2,x3) it is that dynamic balancing excitation identifies object function, xiTo need the parameter identified, x1、x2、x3
Respectively amount of unbalance, bearing rigidity and damping, xi,LFor the lower limit of parameter value to be identified, xi,UFor parameter value to be identified
The upper limit.
Compared with the prior art, the invention has the advantages that：The inventive method will emulate and experiment is organically incorporated in one
Rise, optimized using simulation result and experimental result, by finding contact and rule therebetween, it is real part can be based on
Test data encourages identification model to carry out unknown parameter and exciting force by the dynamic balancing with good robustness and accuracy of identification
Identification.Instant invention overcomes prior art in engineering practice it is cumbersome, limited by equipment result and test condition the shortcomings of,
The present invention can greatly reduce cost on experiment of dynamic balancing and human input and the present invention is easy to learn and promoted, for based on
Simulation model and the excitation recognition methods of the equipment rotor dynamic balancing of experimental data are had laid a good foundation.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is rotor experiment table schematic diagram.
Embodiment
The present invention is described in detail below in conjunction with Fig. 1 flow charts and Fig. 2 embodiments：
Technical scheme one：
As shown in figure 1, the specific implementation step of rotor-support-foundation system dynamic balancing excitation recognition methods of the present invention is as follows：
The collection of step 1 experimental datas
A) combine Fig. 2 and carry out building for rotor testbed, this experimental bench mainly includes：Motor 1, shaft coupling 2, left end bearing
3, current vortex sensor 4, disk 5, rotating shaft 6, right-hand member bearing 7, computer 8 and signal sampler 9.Motor 1 is by shaft coupling 2 with turning
Axle 6 is connected, and spindle central position is provided with disk 5, and rotating shaft is supported by left end bearing 3 and right-hand member bearing 7, current vortex
Signal is delivered to signal sampler 9 by sensor, is operated and is observed finally by the test software in computer 8.
B) original state of rotor testbed is inputted into experiment module, early-stage preparations is done for experimental data collection.Now
Need first to carry out spot dynamic balance to rotor testbed, on the premise of balance level is met, carry out next step dynamic balancing excitation
The research of identification.
C) according to the uneven size and location encouraged applied in rotor simulation process, enter in the relevant position of experimental bench
The application of uneven excitation known to row.By the use of contactless electromagnetic exciter as the tester of experimental data, and use photoelectricity
Sensor monitors the operating rotating speed of rotor in real time, ensures the smooth running of rotating speed, respectively by rotor in inactive state and operating shape
The vibratory response of stateTested, and be input in experiment acquisition module.
Step 2 establishes rotor-support-foundation system limit element artificial module and carries out finite element simulation；
A) basic geometric parameters and material parameter of rotor-support-foundation system are obtained.
Described basic geometric parameters include：Root diameter, length, disk diameter, thickness；
Described stock parameter includes：Density, Poisson's ratio, Young's modulus.
B) according to the rotor basic parameter of input, finite element analysis software is called, finite element is carried out to rotor-support-foundation system first
Modeling；Then the amount of unbalance of known dimensions and the running speed of rotor are inputted in harmonic responding analysis module, passes through calculating
The rotor oscillation response U under by known uneven incentive action can be finally obtained in the post-processing module of finite element softwarej,k
(Ω,x1,x2,x3)；
Step 3 establishes rotor-support-foundation system dynamic balancing excitation identification optimal model；
A) present invention is based on Fig. 2 rotor test stands, have studied the rotor dynamic balancing excitation identification side based on simulation model
Method research, according to FEM Numerical Simulation Uj,k(Ω,x1,x2,x3) and experimental resultsIt is inclined with the two
Difference is minimum, constructs object function, using amount of unbalance, bearing rigidity and damping parameter as parameter to be identified, establishes and optimizes
Parameter identification mathematical modeling.It is shown below,
Minimize f(Ω,x1,x2,x3)
Subject to xi,L≤xi≤xi,U xi∈ x, i=1,2,3
Wherein, f (Ω, x1,x2,x3) for construction object function, xiTo need the parameter identified, x1、x2、x3Respectively not
Aequum, bearing rigidity and damping, xi,LFor the lower limit of parameter value to be identified, xi,UFor the upper limit of parameter value to be identified.
Deploy research below by the dynamic equilibrium problems under the conditions of three kinds of functions, verify the validity of the inventive method.
Following three kinds of functional forms are studied,
Wherein k, j, Ω represent wheel disc position, point position and running speed respectively.
4) optimization algorithm solves
A) genetic algorithm, method of Lagrange multipliers etc. can be selected in optimization algorithm, herein preferably genetic algorithm.Using something lost
Propagation algorithm is iterated solution, is found in solution procedure when without white noise acoustic jamming, and bearing parameter worst error is 2%, uneven
Result is as shown in table 1 when weighing and encourage error approximation 0%, and the white Gaussian noise that jamtosignal is 10% be present, bearing parameter error
It is larger, and the maximum identification error of amount of unbalance is 5.2%, has higher accuracy of identification.
The recognition result of table 1 contrasts with reference value
5) output of result
The parameter to be identified of rotor-support-foundation system is finally can obtain by above-mentioned solution, and then the imbalance for obtaining rotor-support-foundation system swashs
Encourage power and uneven moment of torsion.
Technical scheme two：
Technical scheme two will be tested relative to technical scheme one and simulation process is exchanged, and first carries out finite element and imitates
Very, then measuring is carried out.
Step 1 establishes rotor simulation model and obtains the FEM Numerical Simulation of rotor oscillation response；
Obtain the basic geometric parameters and material parameter of rotor-support-foundation system；Finite element analysis software is called, first to rotor system
System carries out finite element modeling, and then the amount of unbalance known to input in harmonic responding analysis module, is finally obtained by finite element simulation
Rotor oscillation responds Uj,k(Ω,x1,x2,x3), wherein x1、x2、x3For parameter to be identified, respectively amount of unbalance, bearing rigidity and
Damping；K, j, Ω represent different wheel disc positions, point position and running speed respectively；
Described basic geometric parameters include：Root diameter, length, disk diameter, thickness；
Described stock parameter includes：Density, Poisson's ratio, Young's modulus；
Step 2 carries out vibration test and obtains the result of the test of rotor oscillation response；
Experimental bench initialization is carried out first；Rotor is carried out in inactive state and operating shape using contactless electromagnetic exciter
The whirling vibration test of state, obtain the rotor oscillation response that experiment test obtains
Step 3 establishes dynamic balancing excitation identification optimal model；
Object function is set, rotor oscillation response U is obtained according to by finite element simulationj,k(Ω,x1,x2,x3) and experiment survey
Try obtained rotor oscillation responseParameter value to be identified is determined, the dynamic balancing excitation of construction rotor-support-foundation system is known
Other optimal model；
Described parameter to be identified includes initial unbalance, bearing rigidity and damping parameter；
Step 4 optimization algorithms solve；
Solution is iterated using optimization algorithm, obtains the parameter to be identified of rotor-support-foundation system, and then obtain rotor-support-foundation system
Uneven exciting force and uneven moment of torsion.
Claims (5)
1. a kind of rotor-support-foundation system dynamic balancing encourages recognition methods, it is characterised in that comprises the following steps：
Step 1 installs current vortex sensor in rotating shaft；
Step 2 motors are started shooting, and after rotor reaches desired speed and stabilization, are gathered the output of current vortex sensor, are obtained
To the measured value of rotor oscillation response；
Step 3 motors stall, and gather the geometric parameter and material parameter of rotor-support-foundation system, establish the finite element mould of rotor-support-foundation system
Type；
Step 4 obtains the simulation value of rotor oscillation response by finite element simulation；
Step 5 sets rotor-support-foundation system dynamic balancing excitation identification object function and optimal model；
Step 6 is iterated solution using optimization algorithm, obtains the initial unbalance, bearing rigidity and resistance of rotor-support-foundation system
Buddhist nun's parameter.
A kind of 2. rotor-support-foundation system dynamic balancing excitation recognition methods as claimed in claim 1, it is characterised in that the rotor-support-foundation system
The minimum principle of difference of measured value and simulation value that dynamic balancing excitation identification object function is responded with rotor oscillation.
A kind of 3. rotor-support-foundation system dynamic balancing excitation recognition methods as claimed in claim 1 or 2, it is characterised in that the rotor
System dynamic balancing excitation identifies that optimal model is
Minimize f(Ω,x1,x2,x3)
Subject to xi,L≤xi≤xi,UI=1,2,3
Wherein, f (Ω, x1,x2,x3) it is that rotor-support-foundation system dynamic balancing excitation identifies object function, xiTo need the parameter identified, x1、
x2、x3Respectively amount of unbalance, bearing rigidity and damping, xi,LFor the lower limit of parameter value to be identified, xi,UTaken for parameter to be identified
The upper limit of value.
A kind of 4. rotor-support-foundation system dynamic balancing excitation recognition methods as claimed in claim 1 or 2, it is characterised in that described electricity
Eddy current sensor is distributed the symmetric position with rotating shaft in pairs；Current vortex sensor has 2~3 pairs.
A kind of 5. rotor-support-foundation system dynamic balancing excitation recognition methods as claimed in claim 3, it is characterised in that described current vortex
Sensor is distributed the symmetric position with rotating shaft in pairs；Current vortex sensor has 2~3 pairs.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827539A (en) * | 2018-03-30 | 2018-11-16 | 江苏大学 | A kind of online dynamic balance running device of more rotor assembly |
| CN109359370A (en) * | 2018-10-08 | 2019-02-19 | 东北大学 | Predictor method is responded based on the anti-large scale structure ground vibration pushed away of rumble spectrum |
| CN109829262A (en) * | 2019-04-04 | 2019-05-31 | 哈尔滨工程大学 | A kind of rotor-bearing system nonlinear dynamic analysis method |
| CN110146280A (en) * | 2019-06-06 | 2019-08-20 | 西安交通大学 | A kind of rotating machinery dynamic mechanical measurement experimental provision and experimental method |
| CN110646141A (en) * | 2019-09-24 | 2020-01-03 | 华能(大连)热电有限责任公司 | Office software-based rotary machine on-site dynamic balance calculation and adjustment method |
| CN110823454A (en) * | 2019-11-21 | 2020-02-21 | 沈阳建筑大学 | Mass compensation optimization method for high-speed spindle mechanical dynamic balance device |
| CN110929419A (en) * | 2018-12-29 | 2020-03-27 | 山东大学 | Method for quickly predicting instability limit of steam turbine rotor system based on shroud zero damping |
| CN111413031A (en) * | 2019-01-07 | 2020-07-14 | 哈尔滨工业大学 | Deep learning regulation and assembly method and device for large-scale high-speed rotation equipment based on dynamic vibration response characteristics |
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| CN114577397A (en) * | 2022-03-17 | 2022-06-03 | 湖南科技大学 | Dynamic balance method and system for high-speed permanent magnet motor rotor |
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| CN117010039A (en) * | 2023-07-18 | 2023-11-07 | 江苏优探智能科技有限公司 | Structure optimization method of rotary mirror base and related equipment thereof |
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| CN114577397A (en) * | 2022-03-17 | 2022-06-03 | 湖南科技大学 | Dynamic balance method and system for high-speed permanent magnet motor rotor |
| CN114577397B (en) * | 2022-03-17 | 2023-10-13 | 湖南科技大学 | Dynamic balancing method and system for rotor of high-speed permanent magnet motor |
| CN114910235A (en) * | 2022-06-08 | 2022-08-16 | 北京航空航天大学 | Adjustable fulcrum dynamic load rotary excitation device |
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| CN116306143A (en) * | 2023-03-17 | 2023-06-23 | 中国航空发动机研究院 | Double-rotor system unbalance fault simulation method and electronic equipment |
| CN116306143B (en) * | 2023-03-17 | 2023-09-22 | 中国航空发动机研究院 | Double-rotor system unbalance fault simulation method and electronic equipment |
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| CN117010039B (en) * | 2023-07-18 | 2024-03-01 | 江苏优探智能科技有限公司 | Structure optimization method of rotary mirror base and related equipment thereof |
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| CN107389267B (en) | 2019-02-01 |
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