CN109948218A - A kind of dynamic analysis method based on blower fan system - Google Patents
A kind of dynamic analysis method based on blower fan system Download PDFInfo
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- CN109948218A CN109948218A CN201910184084.1A CN201910184084A CN109948218A CN 109948218 A CN109948218 A CN 109948218A CN 201910184084 A CN201910184084 A CN 201910184084A CN 109948218 A CN109948218 A CN 109948218A
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Abstract
The present invention provides a kind of dynamic analysis method based on blower fan system, includes the following steps: Step 1: establishing the threedimensional model of blower fan system with SolidWorks software；Step 2: threedimensional model is imported into ANSYS software, and model analysis is carried out to corresponding model, obtains the intrinsic frequency and Mode Shape of blower fan system；Step 3: carrying out harmonic responding analysis to blower fan system model, the amplitude frequency curve figure of multiple measuring points is obtained, and the amplitude frequency curve figure of obtained multiple measuring points is analyzed and studied.By carrying out dynamics research to blower fan system, it can be achieved that designing in blower fan system at the beginning of installing, the vibration characteristics of blower fan system can be estimated, provides foundation to improve the dynamic performance of blower fan system.
Description
Technical field
The present invention relates to fan vibration technical field, in particular to a kind of dynamic analysis method based on blower fan system.
Background technique
Blower is a kind of universal machine being widely used in industrial production, is all sent out in all fields of national economy
Wave extremely important effect.Blower is a kind of very typical rotating machinery, is one of key equipment of iron and steel enterprise.Sintering
Main exhauster is one of core equipment of sintering plant, carries the vital task for sintering machine ventilation, sintering plant of being known as
Whether " lungs ", operating will normally be directly related to the quality of the safety in production and benefit of iron-smelter.Vibration is the main pumping of sintering
One of main forms of fan trouble.Rotor-support-foundation system imbalance is to cause one of main exciting source of fan vibration.Meanwhile
It can aggravate the Vibration Condition of blower since blower foundation designs the factors such as unreasonable, base flexible unstability also.Blower foundation and its
Whether the design of vibrating isolation system is reasonable, whether operation normally plays a crucial role for reducing fan vibration.
The vibration and noise of blower in the operating condition how is reduced, the physical and mental health of operator is protected and extends equipment
Service life, while ensuring that blower can be continuously run in normal conditions for a long time, just becoming one must solve
Realistic problem.Therefore, dynamic optimization just is carried out to its mechanical structure at the beginning of the design of Fan Equipment and manufacture；It is built in workshop
With equipment installation when dynamic analysis is integrally just carried out to blower, foundation structure parameter can be optimized, with meet blower low noise,
The requirement of low vibration and quiet, the kinetic characteristics of structure, this integrally to carry out blower dynamic analysis with very heavy
The realistic meaning wanted.
Summary of the invention
In order to solve the problems, such as described in background technique, the present invention provides a kind of dynamic analysis side based on blower fan system
Method can estimate blower system by carrying out dynamics research to blower fan system, it can be achieved that designing in blower fan system at the beginning of installing
The vibration characteristics of system provides foundation to improve the dynamic performance of blower fan system.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of dynamic analysis method based on blower fan system, includes the following steps:
Step 1: establishing the threedimensional model of blower fan system with SolidWorks software；
Step 2: threedimensional model is imported into ANSYS software, and model analysis is carried out to corresponding model, obtains wind
The intrinsic frequency and Mode Shape of machine system；
Step 3: carrying out harmonic responding analysis to blower fan system model, the amplitude frequency curve figure of multiple measuring points is obtained, and to gained
To the amplitude frequency curve figures of multiple measuring points analyzed and studied.
Further, the blower fan system includes: blower, bearing, shaft coupling, motor, basis and spring damping vibration isolation
Device.
Further, the step two specifically includes:
Step 201, firstly, the threedimensional model for the blower fan system established in SolidWorks software is saved as
.parasolid format and ANSYS software is imported；
Step 202 is used uniformly the International System of Units in ANSYS analysis, and foundation sole plate uses solid95 unit, spring
Vibration isolator uses combination14 unit, and draught fan impeller uses solid45 unit, and fan shaft uses solid95 unit；
Step 203 carries out free mesh to blower fan system model, arranges multiple steel springs in the quadrangle of blower foundation
Vibration isolator improves stability to increase support stiffness, arranges multiple support spring dresses without damper at the middle part on basis
It sets；
Step 204 carries out model analysis to blower fan system, obtains the intrinsic frequency and Mode Shape of blower fan system.
Further, the step three specifically includes:
Step 301 carries out harmonic responding analysis to blower fan system model, obtains the response of blower fan system at different frequencies
Correspond to the relation curve of frequency with this response；Peak response is found from these relation curves, further finds out peak value frequency
The corresponding stress situation of rate；
Step 302, by the analysis and research to above-mentioned response, relation curve and Curve Maximization after, to blower fan system
Continuous driving force characteristic is estimated, and whether the former design of a step of going forward side by side card can successfully avoid fatigue, resonance etc. harmful existing
As；
Step 303 respectively arranges multiple surveys on the bearing block of left and right two of the bearing block of the left and right of blower two and motor
Point；
Step 304, the harmonic responding analysis that blower fan system is carried out on the basis of blower fan system model analysis are carrying out mode
Do not apply external applied load when analysis, only calculates intrinsic frequency, the result of Mode Shape；Harmonic responding analysis is carried out to blower fan system
It needs to be applied with out-of-balance force according to practical situation, calculates the vibration of the blower fan system under the out-of-balance force effect of different frequency
Emotionally condition.
Compared with prior art, the beneficial effects of the present invention are:
1, by carrying out dynamics research to blower fan system, it can be achieved that designing in blower fan system at the beginning of installing, energy is pre-
Estimate the vibration characteristics of blower fan system, provides foundation to improve the dynamic performance of blower fan system.
2, for relative to the independent model analysis of carry out to blower, basis or other executing agencies, to blower fan system
It carries out model analysis and then possesses the former incomparable superiority.As long as the model foundation of blower fan system it is enough rationally as long as can be more
The vibration characteristics for adding true reaction blower fan system, more accurately calculates the intrinsic frequency and Mode Shape of blower fan system,
More believable foundation and technical support are provided for the day-to-day operation and maintenance of blower.
Detailed description of the invention
Fig. 1 is blower fan system structure diagram；
Fig. 2 is the threedimensional model of blower fan system；
The intrinsic frequency of Fig. 3 blower fan system for no isolation spring and when having isolation spring；Wherein: Fig. 3-1 is no vibration isolation bullet
Spring；Fig. 3-2 is to have isolation spring；
Fig. 4 is the displacement cloud atlas of Mode Shape corresponding to the preceding 15 rank intrinsic frequency of blower fan system；Wherein: Fig. 4-1 is 1
Rank intrinsic frequency FREQ=1.598Hz；Fig. 4-2 is 2 rank intrinsic frequency FREQ=1.624Hz；Fig. 4-3 is 3 rank intrinsic frequencies
FREQ=2.257Hz；Fig. 4-4 is 4 rank intrinsic frequency FREQ=2.629Hz；Fig. 4-5 is 5 rank intrinsic frequency FREQ=
2.741Hz；Fig. 4-6 is 6 rank intrinsic frequency FREQ=3.312Hz；Fig. 4-7 is 7 rank intrinsic frequency FREQ=10.683Hz；Fig. 4-
8 be 8 rank intrinsic frequency FREQ=12.656Hz；Fig. 4-9 is that 9 rank intrinsic frequency FREQ=13.594Hz Fig. 4-10 are that 10 ranks are intrinsic
Frequency FREQ=17.604Hz；Fig. 4-11 is 11 rank intrinsic frequency FREQ=21.845Hz；Fig. 4-12 is 12 rank intrinsic frequencies
FREQ=22.293Hz；Fig. 4-13 is 13 rank intrinsic frequency FREQ=23.691Hz；Fig. 4-14 is 14 rank intrinsic frequency FREQ=
25.155Hz；Fig. 4-15 is 15 rank intrinsic frequency FREQ=27.024Hz；
Fig. 5 is the layout drawing of four measuring points；
Fig. 6 is the amplitude frequency curve figure of four measuring points；Fig. 6-1 to Fig. 6-4 is respectively No. 1 measuring point, No. 2 measuring points, No. 3 measuring points, 4
Number measuring point figure；
Fig. 7 is the amplitude frequency curve figure of upward four measuring points of x, y, z tripartite.Fig. 7-1 to Fig. 7-3 is respectively x, y, z directional diagram.
In Fig. 1: the 6- spring damping vibration isolator 7-1 measuring point of the basis 1- blower 2- bearing 3- shaft coupling 4- motor 5-
8-2 measuring point 9-3 measuring point 10-4 measuring point.
Specific embodiment
Specific embodiment provided by the invention is described in detail below in conjunction with attached drawing.
A kind of dynamic analysis method based on blower fan system, includes the following steps:
Step 1: the foundation of blower fan system threedimensional model
The step one specifically:
1, firstly, with a model produced by Hao Dun company, Britain of certain steel enterprise company ironmaking head factory
For the main exhauster of sintering of L3N357512184DBL6F, as shown in Figure 1, blower fan system specifically includes that blower 1, bearing 2, connection
Axis device 3, motor 4, basic 5, spring damping vibration isolator 6.
2, blower important technological parameters
By the major technique ginseng of the main exhauster of sintering of the model L3N357512184DBL6F of Hao Dun company, Britain production
Number is as shown in table 1.
The important technological parameters of 1 main exhauster of table
3, the threedimensional model of blower fan system is established with SolidWorks software
The threedimensional model of blower fan system is complex, if directly establishing finite element model in ANSYS software can then consume
Take a large amount of time.In order to improve modeling efficiency, the present invention uses and first establishes the three of blower fan system in SolidWorks software
Then dimension module imports the method for ANSYS software again.After reasonably simplify to blower fan system, the present invention is used
SolidWorks software establishes the threedimensional model of blower fan system, as shown in Figure 2.
Step 2: the threedimensional model for the blower fan system established in SolidWorks software is imported into ANSYS software,
And model analysis is carried out to corresponding model, obtain the intrinsic frequency and Mode Shape of blower fan system.
The step two specifically:
1, firstly, the threedimensional model for the blower fan system established in SolidWorks software is saved as .parasolid lattice
Formula simultaneously imports ANSYS software.
2, the International System of Units is used uniformly in ANSYS analysis, foundation sole plate uses solid95 unit, spring vibration-isolator
Using combination14 unit, foundation sole plate uses reinforced concrete that its elasticity modulus is made as 6e9Pa, density are
2700kg/m3, Poisson's ratio 0.2, spring vibration-isolator is made of spring steel and damper, damped coefficient 5kNs/m, just
Degree is 2000000N/m, and the stiffness coefficient K of support spring is 2000000N/m, and draught fan impeller uses solid45 unit, and blower turns
Axis uses solid95 unit, and draught fan impeller is made of ordinary carbon steel, elasticity modulus 2e11Pa, density 7800kg/m3,
Poisson's ratio is 0.3, and the shaft of blower is made of steel alloy, elasticity modulus 2.06e11Pa, density 7800kg/m3, pool
Pine is than being 0.3.Free mesh is carried out to blower fan system model.4 steel spring vibration isolators are arranged in the quadrangle of blower foundation,
Stability is improved in order to increase support stiffness, arranges 2 support spring devices for being free of damper at the middle part on basis.
3, model analysis is carried out to blower fan system, obtains the intrinsic frequency and Mode Shape of blower fan system.
The intrinsic frequency of no isolation spring and blower fan system when having isolation spring is as shown in Figure 3.From figure 3, it can be seen that every
The utilization of vibration spring can be substantially reduced the intrinsic frequency of blower fan system, this is conducive to the vibration isolation efficiency for improving blower entirety.
Each rank intrinsic frequency is corresponding with a specific Mode Shape, obtains each mould with can be convenient in ANSYS software
The change in displacement cloud atlas of the state vibration shape.Displacement cloud atlas such as Fig. 4 of Mode Shape corresponding to the preceding 15 rank intrinsic frequency of blower fan system
It is shown.
From fig. 4, it can be seen that the corresponding Mode Shape of preceding 6 rank intrinsic frequency only has an impact to isolation spring, it can't
Cause the strong deformation of blower fan system；What the corresponding Mode Shape of high-order intrinsic frequency since the 7th rank then mainly reflected is
The vibration deformation of blower fan system, deformation is fairly obvious, and the influence for isolation spring is then smaller.When blower and base
Plinth is assembled together to form blower fan system after, rigidity is the Nonlinear Superposition of each building block rigidity, and independent analysis is a certain
The kinematics characteristic of component just has certain limitation.Therefore, in the actual motion of blower fan system, reality should be avoided
Work frequency is overlapped and causes the resonance of blower fan system with these intrinsic frequencies.
Step 3: carrying out harmonic responding analysis to blower fan system model, the amplitude frequency curve figure of four measuring points has been obtained.To gained
To the amplitude frequency curve figures of four measuring points analyzed and studied.
Harmonic responding analysis carried out to blower fan system model, available blower fan system response at different frequencies and this
A little responses correspond to the relation curve of frequency.Peak response can be found from these relation curves, and can be further
Find out the corresponding stress situation of crest frequency.It, can after the analysis and research to above-mentioned response, relation curve and Curve Maximization
It is estimated with the continuous driving force characteristic to blower fan system, it is tired whether the former design of a step of going forward side by side card can successfully avoid
The harmful phenomenons such as labor, resonance.And then means optimum structural parameter appropriate can be taken, it is bad to reduce blower fan system vibration etc.
It influences.Since bear vibration can more intensively react the Vibration Condition of blower fan system, in the axis of the left and right of blower two
Hold respectively arranged on the bearing block of left and right two of seat and motor a measuring point i.e. measuring point 1 (7), measuring point 2 (8), measuring point 3 (9) with
And measuring point 4 (10), the layout drawing of four measuring points, as shown in Figure 5.
The harmonic responding analysis of blower fan system is carried out on the basis of blower fan system model analysis.Carrying out model analysis
When do not apply external applied load, the results such as intrinsic frequency, Mode Shape can only be calculated.Carrying out harmonic responding analysis to blower fan system needs
It to be applied with out-of-balance force according to practical situation, calculate the vibration of the blower fan system under the out-of-balance force effect of different frequency
Situation.The amplitude frequency curve figure of aforementioned four measuring point, as shown in Figure 6.
From fig. 6, it can be seen that each crest frequency is consistent with intrinsic frequency when carrying out model analysis to blower fan system.
Meanwhile there is not peak phenomenon in the intrinsic frequency of some low orders, this is because natural frequencies are the intrinsic of vibrating isolation system
Frequency, it is not particularly evident for contributing the vibration of blower fan system, its resonance peak energy is too small in other words has been damped system
It is depleted.In general, the size of each resonance peak increases with the increase of frequency in Fig. 6, this is and out-of-balance force
With the raising of revolving speed, increased trend is consistent.But also occurs low-frequency resonance peak value in Fig. 6 greater than high-frequency resonance
The phenomenon that peak value.The reason of this phenomenon occur is since the vibrating isolation system of blower has therefrom played vibration isolation, vibrating isolation system pair
Vibration isolation efficiency under different frequency is different, and therefore, just will appear low-frequency resonance peak value showing greater than high-frequency resonance peak value
As.
Amplitude frequency curve figure different from of 4 measuring points on three directions of x, y, z on blower fan system, specifically such as Fig. 7 institute
Show.
From figure 7 it can be seen that 4 measuring points are consistent substantially in the upward crest frequency of x, y, z tripartite.From the direction x
As can be seen that the resonance peak size of 4 measuring points is consistent substantially in amplitude frequency curve figure, this explanation is in the direction x blower fan system
Relative deformation it is smaller, this is that the actual conditions acted on " y-z " plane are consistent with out-of-balance force.Because of blower
Out-of-balance force and motor out-of-balance force all act in " y-z " plane, and with the raising of rotation speed of fan, out-of-balance force can be with
Rising, two out-of-balance forces can have in each measuring point and have synergistic effect in various degree, and the synergistic effect of each measuring point can be with
The change of excited frequency and change.From the above-mentioned direction y, z-amplitude frequency curve figure in above-mentioned guess is verified.Compare x, y, z
The vibration amplitude that the amplitude frequency curve figure in three directions can be seen that the direction y is maximum, x to vibration amplitude it is minimum, this also with imbalance
Power is to act on " y-z " plane, and the rigidity in the direction blower z is greater than this actual conditions of the rigidity in the direction y and is consistent.
Above embodiments are implemented under the premise of the technical scheme of the present invention, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
Not mentionleting alone bright is conventional method.
Claims (4)
1. a kind of dynamic analysis method based on blower fan system, which comprises the steps of:
Step 1: establishing the threedimensional model of blower fan system with SolidWorks software；
Step 2: threedimensional model is imported into ANSYS software, and model analysis is carried out to corresponding model, obtains blower system
The intrinsic frequency and Mode Shape of system；
Step 3: carrying out harmonic responding analysis to blower fan system model, the amplitude frequency curve figure of multiple measuring points is obtained, and to obtained
The amplitude frequency curve figure of multiple measuring points is analyzed and is studied.
2. a kind of dynamic analysis method based on blower fan system according to claim 1, which is characterized in that the wind
Machine system includes: blower, bearing, shaft coupling, motor, basis and spring damping vibration isolator.
3. a kind of dynamic analysis method based on blower fan system according to claim 1, which is characterized in that the step
Rapid two specifically include:
Step 201, firstly, the threedimensional model for the blower fan system established in SolidWorks software is saved as .parasolid
Format simultaneously imports ANSYS software；
Step 202 is used uniformly the International System of Units in ANSYS analysis, and foundation sole plate uses solid95 unit, spring vibration isolation
Device uses combination14 unit, and draught fan impeller uses solid45 unit, and fan shaft uses solid95 unit；
Step 203 carries out free mesh to blower fan system model, arranges multiple steel spring vibration isolation in the quadrangle of blower foundation
Device, improves stability to increase support stiffness, arranges multiple support spring devices without damper at the middle part on basis；
Step 204 carries out model analysis to blower fan system, obtains the intrinsic frequency and Mode Shape of blower fan system.
4. a kind of dynamic analysis method based on blower fan system according to claim 1, which is characterized in that the step
Rapid three specifically include:
Step 301 carries out harmonic responding analysis to blower fan system model, obtains blower fan system response at different frequencies and this
Response corresponds to the relation curve of frequency；Peak response is found from these relation curves, further finds out crest frequency pair
The stress situation answered；
Step 302, by the analysis and research to above-mentioned response, relation curve and Curve Maximization after, blower fan system is continued
Kinetic characteristics are estimated, and whether the former design of a step of going forward side by side card can successfully avoid the harmful phenomenons such as fatigue, resonance；
Step 303 respectively arranges multiple measuring points on the bearing block of left and right two of the bearing block of the left and right of blower two and motor；
Step 304, the harmonic responding analysis that blower fan system is carried out on the basis of blower fan system model analysis are carrying out model analysis
When do not apply external applied load, only calculate intrinsic frequency, the result of Mode Shape；Harmonic responding analysis needs are carried out to blower fan system
It is applied with out-of-balance force according to practical situation, calculates the vibration feelings of the blower fan system under the out-of-balance force effect of different frequency
Condition.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274728A (en) * | 2019-07-24 | 2019-09-24 | 浙江科力风机有限公司 | A kind of draught fan impeller balance detecting device |
| CN110702314A (en) * | 2019-10-10 | 2020-01-17 | 西北工业大学 | Non-trial-weight transient high-speed dynamic balancing method based on flexible rotor acceleration response information |
| CN110702313A (en) * | 2019-10-10 | 2020-01-17 | 西北工业大学 | Method for high-precision identification of unbalanced excitation force of flexible rotor based on variable-speed starting |
| CN112784379A (en) * | 2021-03-09 | 2021-05-11 | 重庆邮电大学 | Optimization design method of impeller rotor system |
| CN112857562A (en) * | 2021-01-04 | 2021-05-28 | 中国神华能源股份有限公司国华电力分公司 | Method for adaptively monitoring torsional vibration state of generator |
| CN114033720A (en) * | 2021-10-20 | 2022-02-11 | 中核核电运行管理有限公司 | Fan base, fan overall equipment and fan vibration control method |
| US11608158B1 (en) | 2022-07-25 | 2023-03-21 | Joon Bu Park | Negative Poisson's ratio materials for propellers and turbines |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274728A (en) * | 2019-07-24 | 2019-09-24 | 浙江科力风机有限公司 | A kind of draught fan impeller balance detecting device |
| CN110702314A (en) * | 2019-10-10 | 2020-01-17 | 西北工业大学 | Non-trial-weight transient high-speed dynamic balancing method based on flexible rotor acceleration response information |
| CN110702313A (en) * | 2019-10-10 | 2020-01-17 | 西北工业大学 | Method for high-precision identification of unbalanced excitation force of flexible rotor based on variable-speed starting |
| CN110702314B (en) * | 2019-10-10 | 2021-04-20 | 西北工业大学 | Non-trial-weight transient high-speed dynamic balancing method based on flexible rotor acceleration response information |
| CN112857562A (en) * | 2021-01-04 | 2021-05-28 | 中国神华能源股份有限公司国华电力分公司 | Method for adaptively monitoring torsional vibration state of generator |
| CN112857562B (en) * | 2021-01-04 | 2022-11-11 | 中国神华能源股份有限公司国华电力分公司 | Method for adaptively monitoring torsional vibration state of generator |
| CN112784379A (en) * | 2021-03-09 | 2021-05-11 | 重庆邮电大学 | Optimization design method of impeller rotor system |
| CN112784379B (en) * | 2021-03-09 | 2023-05-23 | 重庆邮电大学 | Optimal design method of impeller rotor system |
| CN114033720A (en) * | 2021-10-20 | 2022-02-11 | 中核核电运行管理有限公司 | Fan base, fan overall equipment and fan vibration control method |
| US11608158B1 (en) | 2022-07-25 | 2023-03-21 | Joon Bu Park | Negative Poisson's ratio materials for propellers and turbines |
| US11952090B2 (en) | 2022-07-25 | 2024-04-09 | Joon Bu Park | Negative Poisson's ratio materials for propellers and turbines |
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Application publication date: 20190628 |