CN110188514A - The rotor annular components floor error of division causes rotor unbalance value analytic approach - Google Patents
The rotor annular components floor error of division causes rotor unbalance value analytic approach Download PDFInfo
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- CN110188514A CN110188514A CN201910619560.8A CN201910619560A CN110188514A CN 110188514 A CN110188514 A CN 110188514A CN 201910619560 A CN201910619560 A CN 201910619560A CN 110188514 A CN110188514 A CN 110188514A
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- floor
- unbalance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a kind of rotor annular components floor errors of division to draw rotor unbalance value analytic approach, and step includes: that (1) obtains rotor unbalance value caused by monolithic floor indexing welding error；(2) the vector superposed grouping scheme of each floor amount of unbalance is determined；(3) the is determined on annular componentsiBlock floor maximum amount of unbalance as caused by the welding error of division, it is overlapped based on two vector parallelogram principle of stackings, calculates limit maximum amount of unbalance total under grouping scheme；(4) rule of probability distribution function is met by the annular components floor welding error of division to determine practical amount of unbalance section.The present invention discloses the internal relation between the annular components floor welding error of division and rotor structure amount of unbalance, and this method can be under the premise of ensureing processing economy, rotor oscillation caused by reducing to greatest extent because of mismachining tolerance, to reduce the rotor-support-foundation system initial unbalance, caused by processing.
Description
Technical field
The invention belongs to rotor dynamic mechanics fields, and in particular to annular components floor processing point in a kind of rotor-support-foundation system
Spend the analytic approach of Imbalance in weight caused by error.
Background technique
The large-sized low-speeds magnetoes such as wind-power electricity generation direct driving motor, permanent magnetism naval vessels propulsion electric machine, it is special due to its work
Property, it is desirable that it has the characteristics that low vibration and low noise, and with the continuous progress of science and technology and to motor require continuous promotion,
The directions such as magneto enlargement, high power are caused to be developed, the weight and volume of this kind of magneto is also continuously increased.Due to forever
The feature that the quality of magneto annular components is big and diameter is big, so the mismachining tolerance and assembly that are difficult to avoid that in manufacturing process
Rotor unbalance is the principal element for influencing magneto long-time steady operation caused by precision problem.Annular components are normal
Its strength and stiffness is reinforced using floor.Support rib is mounted on annular components frequently with welding manner, inevitably
There is working grading error.Meanwhile the accurate limit amount of unbalance for calculating rotor, judge whether to meet balance quality, Ke Yiwei
Rotor design provides reference, to provide technical support to improve rotating machinery reliability.
Summary of the invention
In order to solve the above technical problem, the present invention provides one kind can control from source by annular components floor point
Degree error causes the analytic approach of Imbalance in weight caused by the shape components floor working grading error of rotor unbalance value.
Technical proposal that the invention solves the above-mentioned problems is: a kind of rotor annular components floor error of division causes rotor
Amount of unbalance analytic approach, includes the following steps:
(1) it constructs single floor physical model and seeks its quality m, and seek the distance r of its centroid distance centre of gyrationi, thus
Monolithic floor is obtained because of amount of unbalance U produced by the welding error of divisioni, the floor limit point is then determined according to processing technology grade
Error is spent, maximum distance r of the floor mass center away from the centre of gyration is found out, to obtain the maximum amount of unbalance of floorIt is big
Small is mr, and direction is the mass center that the annular centre of gyration is directed toward floor；
(2) error of division is welded for the equally distributed floor of even numbered blocks and greatest limit, 2N block floor is divided into reason
Thinking symmetrical N pairs about X-axis under state, 2N is the sum of floor on annular components, then is divided into two groups of left and right with Y-axis, wherein
The angle of each pair of floor is 2 (α on the right side of Y-axisi- θ), αiFor i-th piece of acute angle between gusset and X-axis, the angle θ is working grading
Error causes the indexing of floor relative to the maximum deflection angle of ideal position, i.e., deviates most to inner or outer simultaneously on the basis of floor
The big angle θ；The angle of each pair of floor is 2 (α on the left of Y-axisi+θ)；
(3) according to above-mentioned grouping scheme, by amount of unbalance caused by every block of plate of 2N block floor on annular componentsIt is overlapped based on two vector parallelogram principle of stackings, obtains total limit maximum amount of unbalance
(4) error of division is welded according to annular components floor and meets the rule of probability distribution function, according to being uniformly distributed
Mode is handled, and is obtainedClose to the true value of total maximum amount of unbalance.
The above-mentioned rotor annular components floor error of division causes in rotor unbalance value analytic approach, the step (2)
In, since working grading error causes the indexing of even numbered blocks floor to deflect the angle θ or the arc length angle L, θ and arc relative to ideal position
Long L is all greatest limit working grading error；Wherein arc length be converted into angle formula it is as follows:
θ=arctan L/R；
Wherein: R is the internal diameter of annular components, and L is arc length.
The above-mentioned rotor annular components floor error of division causes in rotor unbalance value analytic approach, the step (3)
In, it is vector superposed based on the progress of two vector parallelogram principle of stackings to the amount of unbalance of each floor according to grouping scheme, together
Direction vector carries out scalar addition.
Wherein: UiIt is amount of unbalance caused by monolithic floor i in each pair of floor, when floor is located on the right side of Y-axis, folder
Angle is 2 (αi-θ)；When floor is located on the left of Y-axis, angle is 2 (αi+θ).；
Annular components are obtained as a result, because structural limits amount of unbalance section caused by working grading error isAnd no working grading error ideally, annular components are in uniform along the centre of gyration
Symmetrical equilibrium state, amount of unbalance zero, i.e.,Therefore because structural limits caused by working grading error are uneven
Amount section is
Compared with prior art, the beneficial effects of the present invention are:
The present invention establishes floor physical model, and utilizes vector superposed principle, determines grouping scheme, to obtain annular zero
The uneven magnitude of the maximum that the part floor error of division generates, and then it is uneven to obtain the limit of floor under the influence of working grading error
It measures, discloses the internal relation between the annular components floor welding error of division and rotor structure amount of unbalance；It can refer to
Designer is led according to balance level, selects most suitable mismachining tolerance tolerance range, so that control is due to mismachining tolerance from source
Generated amount of unbalance；The present invention can be reduced to greatest extent under the premise of ensureing processing economy because mismachining tolerance causes
Rotor oscillation, to reduce the rotor-support-foundation system initial unbalance, caused by processing, with control because floor welds the error of division
Caused rotor oscillation.The present invention sets about from mismachining tolerance, to vibration from the control on source, improves machining accuracy, favorably
In the selection and optimization of rotor design scheme.It can also be required simultaneously according to vibration class, this kind of type ring shape components floor is welded
Processing technology is connect to optimize.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is annular component structural schematic diagram.
Fig. 3 is the structural schematic diagram of annular components floor.
Fig. 4 is that annular components simplify and grouping schematic diagram.
Fig. 5 be present invention determine that grouping after vectorial combination schematic diagram.
Fig. 6 is the direction vector figure of final amount of unbalance.
Specific embodiment
The present invention includes the following steps: as shown in Figure 1:
(1) it constructs single floor physical model and seeks its quality m, and seek the distance r of its centroid distance centre of gyrationi, thus
Monolithic floor is obtained because of amount of unbalance U produced by the welding error of divisioni=mri, floor pole is then determined according to processing technology grade
The error of division is limited, maximum distance r of the floor mass center away from the centre of gyration is found out, to obtain maximum amount of unbalanceIts size
For mr, direction is the mass center that the annular centre of gyration is directed toward floor；
(2) error of division is welded for the equally distributed floor of even numbered blocks and greatest limit, by taking Fig. 4 as an example, annular zero
There are 10 (2 × 5) a floors on component, is divided into 5 pairs.Floor 1 and floor 6, floor 2 and floor 5, floor 3 and 4 three pairs of plates of floor are same
When be offset inward the angle θ, the angle θ is greatest limit working grading error；Floor 8 and floor 9,10 two pairs of plates of floor 7 and floor are simultaneously
The offset angle θ outward, dotted line are the position after offset.Finally by vector superposed to X-axis positive direction, floor working grading error at this time
Caused rotor structure amount of unbalance reaches maximum value.
Since working grading error causes the indexing of even numbered blocks floor to deflect the angle θ or arc length L, θ relative to ideal position
Angle and arc length L are all greatest limit working grading error；Wherein arc length be converted into angle formula it is as follows:
θ=arctan L/R；
Wherein: R is the internal diameter of annular components, and L is arc length.
(3) vector of each pairs of amount of unbalance is overlapped based on parallelogram law, obtains total amount of unbalance.Tongfang
Scalar addition is carried out to vector；
Wherein UiIt is amount of unbalance caused by monolithic floor, α in each pair of flooriIt is sharp between gusset and X-axis for i-th piece
Angle, the angle θ are that working grading error causes the indexing of floor relative to the maximum deflection angle of ideal position.
No working grading error ideally, annular components are in equilibrium state, then amount of unbalance is zero, i.e.,The limit amount of unbalance section for then obtaining structural vibration caused by working grading error is
(4) rule that the error of division substantially conforms to probability distribution function is welded according to annular components floor, according to uniform
Distribution mode is handled, and is obtainedClose to the true value of total maximum amount of unbalance.
The embodiment that the ring-shaped rotor bracket floor of magneto is promoted below by certain naval vessels carries out the present invention
It is described in detail.
Step 1: as shown in Figure 2,3, 4, by the main support ring of carriage center, floor being divided into two sides, every side rib plate is
10 pieces.This patent provides analysis method, so amount of unbalance caused by only welding the error of division side floor is counted
It calculates.Floor passes through the physical model of building, it is known that floor with a thickness of 20mm, maximum length 400mm, maximum width 350mm
Maximum distance of the centroid position apart from the centre of gyration is r=355.5mm after offset.Floor quality is m=17.3kg, then monolithic rib
Amount of unbalance caused by plate indexing welding errorIt is possible thereby to see
Large-sized annular components are big in the radius of gyration out, are the main reason for causing the amount of unbalance as caused by the floor error of division big.
Since floor thickness is relative to other sizes, floor thickness can be ignored, so when constructing rotor structure vibration maths model,
Entire floor is regarded as a face；Floor is numbered, then divides floor 1, floor 2, floor 3, floor 4, floor 5, floor 6
For floor 1 and floor 6, floor 2 and floor 5,4 three pairs of floors of floor 3 and floor, while three pairs of floors being labeled as being first
Group.Floor 7, floor 8, floor 9, floor 10 are divided for floor 8 and floor 9,10 two pairs of floors of floor 7 and floor, while by two
Second group is labeled as to floor.Greatest limit working grading error be 2mm, substitute into formula θ=arctan L/R, obtain θ=
0.000056°。
Step 2: first group of floor being offset inward 0.000056 ° simultaneously, the offset outward simultaneously of second group of floor
0.000056°.Finally by vector superposed to X-axis positive direction,At this time caused by floor working grading error
Rotor structure amount of unbalance reaches maximum value.Ideal position is welded on without working grading error in floor, then amount of unbalance is
Zero, i.e.,So the section for obtaining limit amount of unbalance is [0,0.1895].Since working grading error is random point
Cloth, takes its half that can meet the requirements on minimum basal, then having the section of practical amount of unbalance is [0,0.0948].
Claims (3)
1. a kind of rotor annular components floor error of division causes rotor unbalance value analytic approach, include the following steps:
(1) it constructs single floor physical model and seeks its quality m, and seek the distance r of its centroid distance centre of gyrationi, to obtain list
Block floor is because of amount of unbalance U produced by the welding error of divisioni, then determine that the indexing of the floor limit misses according to processing technology grade
Difference finds out maximum distance r of the floor mass center away from the centre of gyration, to obtain the maximum amount of unbalance of floorIts size is
Mr, direction are the mass center that the annular centre of gyration is directed toward floor；
(2) error of division is welded for the equally distributed floor of even numbered blocks and greatest limit, 2N block floor is divided into ideal shape
Symmetrical N pairs about X-axis under state, 2N is the sum of floor on annular components, then is divided into two groups of left and right with Y-axis, wherein being located at Y
The angle of each pair of floor is 2 (α on the right side of axisi- θ), αiFor i-th piece of acute angle between gusset and X-axis, the angle θ is that working grading error is led
Maximum deflection angle of the indexing of floor relative to ideal position is caused, i.e., simultaneously to the inner or outer offset maximum angle θ on the basis of floor；
The angle of each pair of floor is 2 (α on the left of Y-axisi+θ)；
(3) according to above-mentioned grouping scheme, by amount of unbalance caused by every block of plate of 2N block floor on annular componentsBase
It is overlapped in two vector parallelogram principle of stackings, obtains total limit maximum amount of unbalance
(4) rule that the error of division meets probability distribution function is welded according to annular components floor, according to even distribution pattern
It is handled, is obtainedClose to the true value of total maximum amount of unbalance.
2. the rotor annular components floor error of division as described in claim 1 causes rotor unbalance value analytic approach, described
In step (2), since working grading error causes the indexing of even numbered blocks floor to deflect the angle θ or arc length L relative to ideal position,
The angle θ and arc length L are all greatest limit working grading error；Wherein arc length be converted into angle formula it is as follows:
θ=arctan L/R；
Wherein: R is the internal diameter of annular components, and L is arc length.
3. the rotor annular components floor error of division as described in claim 1 causes rotor unbalance value analytic approach, described
In step (3), according to grouping scheme, two vector parallelogram principle of stackings is based on to the amount of unbalance of each floor and carry out vector
Superposition, equidirectional vector carry out scalar addition.
Wherein: UiIt is amount of unbalance caused by monolithic floor i in each pair of floor, when floor is located on the right side of Y-axis, angle 2
(αi-θ)；When floor is located on the left of Y-axis, angle is 2 (αi+θ).；
Annular components are obtained as a result, because structural limits amount of unbalance section caused by working grading error isAnd no working grading error ideally, annular components are in uniform along the centre of gyration
Symmetrical equilibrium state, amount of unbalance zero, i.e.,Therefore because structural limits caused by working grading error are uneven
Measuring section is
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| CN201910619560.8A CN110188514B (en) | 2019-07-10 | 2019-07-10 | Method for analyzing unbalance of rotor caused by scale division error of rib plate of annular part of rotor |
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| CN201910619560.8A CN110188514B (en) | 2019-07-10 | 2019-07-10 | Method for analyzing unbalance of rotor caused by scale division error of rib plate of annular part of rotor |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458128A (en) * | 2015-01-04 | 2015-03-25 | 湖南科技大学 | Turbocharger rotor unbalance amount control method based on dynamic characteristics |
| JP2016218746A (en) * | 2015-05-20 | 2016-12-22 | オークマ株式会社 | Geometric error parameter identification method in machine tool, and control method and device of machine tool |
| CN109724767A (en) * | 2019-03-19 | 2019-05-07 | 西北工业大学 | A kind of wind-tunnel aerofoil profile dynamic test model based on Bionic Design |
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- 2019-07-10 CN CN201910619560.8A patent/CN110188514B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458128A (en) * | 2015-01-04 | 2015-03-25 | 湖南科技大学 | Turbocharger rotor unbalance amount control method based on dynamic characteristics |
| JP2016218746A (en) * | 2015-05-20 | 2016-12-22 | オークマ株式会社 | Geometric error parameter identification method in machine tool, and control method and device of machine tool |
| CN109724767A (en) * | 2019-03-19 | 2019-05-07 | 西北工业大学 | A kind of wind-tunnel aerofoil profile dynamic test model based on Bionic Design |
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