CN106407546A - Method for analyzing local deformation of transmission housing by using original point dynamic stiffness characteristic - Google Patents
Method for analyzing local deformation of transmission housing by using original point dynamic stiffness characteristic Download PDFInfo
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- CN106407546A CN106407546A CN201610816077.5A CN201610816077A CN106407546A CN 106407546 A CN106407546 A CN 106407546A CN 201610816077 A CN201610816077 A CN 201610816077A CN 106407546 A CN106407546 A CN 106407546A
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- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention relates to a method for analyzing local deformation of a transmission housing by using an original point dynamic stiffness characteristic. The method includes the steps shown as the figure: establishing a target transmission housing finite element model by means of Hyperworks simulation analysis software, performing simulation analysis on a bearing hole bearing a maximum load (prone to deformation) of the transmission housing so as to acquire the accelerated speed and a dynamic stiffness response of an original point (stimulation and response are the same point); performing natural mode of vibration analysis on a frequency section which cannot reach a transmission housing stiffness target so as to acquire a housing inherent feature modal frequency and modal shape; and acquiring a housing structure local deformation characteristic through the modal shape, and finally determining a special part having a large housing amplitude and severe local deformation. The method can provide reference for a designer to make a structure optimal scheme for suppressing local deformation.
Description
Technical field
The present invention relates to a kind of method of utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature, can be straight
See and housing local deformation situation is obtained by housing dynamic stiffness weak part, carry out shell structure stiffness optimization for being directed to property
Provides convenient, belongs to machinery and computer crossing domain.
Background technology
Case of transmission, as the supporter of car transmissions, subjects from suffered by engine and vehicle traveling process
Impact force action, easily because intensity, insufficient rigidity cause local fracture to lose efficacy, lead to transmission function to lose efficacy.In order to ensure
The functional reliability of case of transmission, designers typically require the structure serious to deformation and carry out local optimum design, to carry
The intensity of high stressed shell local and rigidity.For improving reliability design level, it is larger accurately to obtain housing amplitude, and deformation is tight
The local location of weight and deformation extent, to carry out the structure-reinforced design of specific aim.
Come from conventional design considerations more and obtain between reliability test result or the method that emulated by acceleration frequency response
?.Reliability test needs to expend substantial amounts of man power and material, so that product development cost is increased, the construction cycle extends；Acceleration
Character of frequency response is relatively easy to obtain, but acceleration character of frequency response and structure not direct correlation, a kind of simply indirect analysis structure
The method of amplitude variations characteristic is it is impossible to realize Optimal Structure Designing is played direct directive function.
Content of the invention
The present invention is to solve the above problems it is contemplated that because rigidity is directly related with architectural feature, in engineering in practice more
Directly the rigidity of structure is controlled easily by structure design.Once obtaining dynamic stiffness frequency response, just can direct reaction shell
Body structure and the relation of deformation, provide for designer's Optimal Structure Designing and directly instruct.Propose one kind for this and utilize initial point
The method of dynamic stiffness specificity analysis case of transmission local deformation feature, it is possible to achieve larger to case of transmission amplitude, dynamic firm
Degree is weak and deforms being accurately positioned of serious concrete structure position.
A kind of method of utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature, determines change for accurate
Fast device housing amplitude is larger, dynamic stiffness is weak and deforms serious concrete structure position it is characterised in that comprising the following steps：
Step one, with three-dimensional drawing software, sets up transmission case volume geometric model, and this geometrical model is imported finite element
In analysis software, set up the finite element analysis model of case of transmission；
Step 2, the selection of the driving source of case of transmission and excitation load determine, the power according to case of transmission passes
Pass approach, select to bear load in this housing and deform maximum position as the driving source of this case of transmission and to apply to encourage
Power：In the frequency range of 0～1000Hz, with 1-5Hz as frequency step, the applying in case of transmission respectively encourages force
X, Y, Z-direction apply the frequency varying load exciting force that amplitude is 1N, the frequency varying load exciting force of setting and excitation types A, phase theta with
And the numerical relationship model of time delay τ is
{ P (f) }={ A } * B (f) ei{φ(f)+θ-2πfτ}(1)
In formula (1), B (f) represents driving frequency change span, and φ (f) represents driving frequency angle change value
Scope；
Step 3, the setting of frequency response point, with the central point at the position bearing load and deformation maximum in step 2
For encouraging source point input load, and it is imitative to carry out driving source initial point acceleration frequence responses using this as the collection point of frequency response
Very, obtain initial point acceleration and the frequency response relation curve reflecting case of transmission；
Step 4, is emulated by finite element analysis software, the X of final output load(ing) point, Y, Z-direction acceleration responsive value, so
The acceleration frequence responses figure being obtained according to above-mentioned emulation afterwards, the position of deformation maximum obtaining case of transmission is in X, Y, Z tri-
The crest frequency point of individual directional acceleration response, judges the driving frequency of case of transmission and the degree of closeness of intrinsic frequency and is somebody's turn to do
There is the probability of resonance in case of transmission；
Step 5, initial point dynamic stiffness frequency response analysis, set up acceleration and dynamic stiffness frequency response relational model
(2) in formula, a represents acceleration responsive, and F represents exciting force, KdRepresent dynamic stiffness, f represents acceleration frequency, passes through
Formula (2) acceleration frequency and dynamic stiffness relational model, obtain the characteristic curve of initial point dynamic stiffness and frequency response relation, further
Find and define the frequency separation of not up to rigidity Design target according to this characteristic curve；
Step 6, the frequency separation for not up to rigidity Design target carries out model analysis, soft using finite element analysis
Part carries out the analytical calculation of mode and dynamic stiffness, obtains modal characteristics of setpoint frequency section obtaining from Mode Shape figure and bears
Load and the specific deformation behaviour in position of deformation maximum, accurately determine that case of transmission amplitude is larger, dynamic stiffness is weak and becomes
The serious concrete structure position of shape.
The method of the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature that the present invention provides, acceptable
Have the feature that it is characterised in that：Wherein, three-dimensional drawing software be UG software, Solidworks software, Pro/e software,
Any one in CATIA software.
The method of the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature that the present invention provides, acceptable
Have the feature that it is characterised in that：Wherein, finite element analysis software be Hyperworks software, ANSYS software,
Any one in ABAQUS software.
The method of the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature that the present invention provides, acceptable
Have the feature that it is characterised in that：Wherein, bearing load and the position of deformation maximum is dead eye or suspension.
The method of the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature that the present invention provides, acceptable
Have the feature that it is characterised in that：Wherein, step 2 medium frequency step-length is preferably 2HZ.
Invention effect and effect
It is an object of the invention to provide planting using initial point dynamic stiffness specificity analysis case of transmission local deformation feature
Method, is different from conventional at present doing by indirectly judging rigidity of structure dangerous spot to acceleration character of frequency response simulation analysis
Method.The method of the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature according to the present invention pass through acceleration and
The relation of dynamic stiffness frequency response, obtains the characteristic curve of initial point dynamic stiffness and frequency response relation；By initial point dynamic stiffness and frequency
Relation curve, finds and defines the frequency separation of not up to rigidity Design target (less than minimum to mark rigidity value)；Using having
Limit meta software carries out the analytical calculation of mode and dynamic stiffness, obtains the modal characteristics of setpoint frequency section and obtains from Mode Shape figure
Obtain the deformation behaviour of the larger portion structure of the stand under load such as housing dead eye, suspension, accurate determination housing amplitude is larger, dynamic stiffness is thin
Weak, deform serious concrete structure position and degree.
Brief description
Fig. 1 is the workflow of the method for use initial point dynamic stiffness specificity analysis case of transmission local deformation feature of the present invention
Journey schematic diagram；
Fig. 2 encourages source and bang path schematic diagram for hull vibration；
Fig. 3 is bearing of input shaft hole initial point acceleration and frequency response relation curve schematic diagram；
Fig. 4 is output shaft bearing hole initial point acceleration and frequency response relation curve schematic diagram；
Fig. 5 is bearing of input shaft hole initial point dynamic stiffness and frequency response relation curve schematic diagram；
Fig. 6 is output shaft bearing hole initial point dynamic stiffness and frequency response relation curve schematic diagram；And
Fig. 7 is model frequency displacement cloud atlas photo, and a is left axle bearing bore photo, and b is left axle bearing bore photo.
In above-mentioned Fig. 3-6, the left side represents left axle bearing bore, and the right represents right axle bearing bore.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, real below
Apply example combine the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature to the present invention for the accompanying drawing method former
Reason, step, using effect are specifically addressed.
Embodiment
Fig. 1 is the workflow of the method for use initial point dynamic stiffness specificity analysis case of transmission local deformation feature of the present invention
Journey schematic diagram.
The present embodiment illustrates taking three-dimensional drawing UG software, Hyperworks finite analysis software as a example, and other three
Such as Solidworks software, Pro/e software, CATIA software and other finite element analysis software such as ANSYS are soft for dimension mapping software
Part, ABAQUS software are also feasible.
Using the method for initial point dynamic stiffness specificity analysis case of transmission local deformation feature, specifically include following steps：
1st, use three-dimensional drawing UG software, set up certain transmission case volume geometric model, import Hyperworks finite analysis
In software, set up the finite element analysis model of housing.Bolt hole, dead eye and suspension belong to the larger position of stress ratio, using 3mm's
Stress and strain model；Relatively small away from the surface of shell stress closing keyhole, using the stress and strain model of 5mm.
2nd, the selection of the driving source of case of transmission and excitation load determine.
Fig. 2 encourages source and bang path schematic diagram for hull vibration.
As shown in Fig. 2 according to the power pipeline of case of transmission, selecting to bear load in housing and deform maximum
Dead eye, suspension etc. are the driving source of case of transmission and apply exciting force；In the frequency range of 0～1000Hz, with 2Hz it is
Frequency step, the X in case of transmission applying excitation force, Y, Z-direction applying amplitude are the simple harmonic quantity unit force of 1N respectively, set
The frequency varying load exciting force put and excitation types, phase place, the relational model of time is：
{ P (f) }={ A } * B (f) ei{φ(f)+θ-2πfτ}(1)
In formula (1), A represents excitation load excitation types, and B (f) represents that (driving frequency is arranged driving frequency span
For 0～1000Hz), φ (f) represents driving frequency angle change span, and θ represents that phase place defines, and τ represents time delay.
3rd, the setting of frequency response point.
Fig. 3 is bearing of input shaft hole initial point acceleration and frequency response relation curve schematic diagram.
Fig. 4 is output shaft bearing hole initial point acceleration and frequency response relation curve schematic diagram.
For the accurate local dynamic station characteristic obtaining case of transmission, adopt and carried for excitation source point input with bearing central point of hole
Lotus, and using same point as the method for the collection point (in same point imposed load and export acceleration responsive) of frequency response, enter
The initial point acceleration frequence responses emulation of row energization source, obtains initial point acceleration and the frequency response relation curve of reactor shell, such as
Fig. 3, shown in 4, represent input and output shaft bearing hole initial point acceleration and frequency response relation curve respectively.
4th, initial point acceleration frequence responses analysis.
Compared with the characteristic parameter characterizing system vibration response with other, acceleration is easier to measure, so first passing through
Hyperworks emulates, the X of final output load(ing) point, Y, Z-direction acceleration responsive value.According to acceleration frequence responses figure, obtain
Target transmission housing dead eye is in the crest frequency point of tri- directional acceleration responses of X, Y, Z, judges housing driving frequency
With the degree of closeness of intrinsic frequency and the probability of housing generation resonance.
5th, initial point dynamic stiffness frequency response analysis.
Fig. 5 is bearing of input shaft hole initial point dynamic stiffness and frequency response relation curve schematic diagram.
Fig. 6 is output shaft bearing hole initial point dynamic stiffness and frequency response relation curve schematic diagram.
Because rigidity is related to architectural feature, it is controlled more easily by structure design in practice in engineering.Therefore need
Manage to obtain initial point dynamic stiffness frequency response by initial point acceleration frequence responses simulation result.Set up acceleration and dynamic stiffness frequency
Ring relational model：
(2) in formula, a represents acceleration responsive, and F represents exciting force, KdRepresent dynamic stiffness, f represents acceleration frequency.
By formula (2) acceleration frequency and dynamic stiffness relational model, obtain the spy of initial point dynamic stiffness and frequency response relation
Linearity curve；By initial point dynamic stiffness and frequency dependence, find and define the frequency separation of not up to rigidity Design target.As
Fig. 5, shown in 6, the dynamic stiffenss ratio in 310Hz frequency vicinity for the right axle bearing bore is weaker, less than minimum standard to mark dynamic stiffness
1.00E+006N/m.
6th, the frequency separation being directed to not up to rigidity Design target carries out model analysis.
Fig. 7 is model frequency displacement cloud atlas photo, and a is left axle bearing bore photo, and b is left axle bearing bore photo.
Carry out the analytical calculation of mode using Hyperworks software, obtain right axle bearing bore in 300～350Hz frequency band
The first-order modal vibration shape, and when Mode Shape figure is that Fig. 7, visible dynamic stiffness is weak, the specific deformation behaviour of this dead eye.Logical
Cross structure and improve to suppress the deformation at this so as to meet dynamic stiffness evaluation index.
Other key positions of case of transmission can obtain change using similar initial point dynamic stiffness Frequency Response evaluation method
Fast device housing local deformation feature.
In above-described embodiment, the frequency step in 2 sections is set as that 2Hz is an optimal value it is also possible to according to circumstances in 1-
Other values are chosen in the range of 5Hz.
The effect of embodiment and beneficial effect
It is an object of the invention to provide planting using initial point dynamic stiffness specificity analysis case of transmission local deformation feature
Method, is different from conventional at present doing by indirectly judging rigidity of structure dangerous spot to acceleration character of frequency response simulation analysis
Method.The method of the utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature according to the present invention pass through acceleration and
The relation of dynamic stiffness frequency response, obtains the characteristic curve of initial point dynamic stiffness and frequency response relation；By initial point dynamic stiffness and frequency
Relation curve, finds and defines the frequency separation of not up to rigidity Design target (less than minimum to mark rigidity value)；Using having
Limit meta software carries out the analytical calculation of mode and dynamic stiffness, obtains the modal characteristics of setpoint frequency section and obtains from Mode Shape figure
Obtain the deformation behaviour of the larger portion structure of the stand under load such as housing dead eye, suspension, accurate determination housing amplitude is larger, dynamic stiffness is thin
Weak, deform serious concrete structure position and degree.
Because rigidity is directly related with architectural feature, directly firm to structure more easily by structure design in practice in engineering
Degree is controlled.Once obtain dynamic stiffness frequency response, just can direct reaction shell structure with deformation relation, be designer knot
Structure optimization design provides and directly instructs.The method that therefore the present embodiment provides, can facilitate designer to carry out case of transmission
Intensity Design.
Claims (5)
1. a kind of method of utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature, described for accurate determination
Case of transmission amplitude is larger, dynamic stiffness is weak and deforms serious concrete structure position it is characterised in that including following walking
Suddenly：
Step one, with three-dimensional drawing software, sets up transmission case volume geometric model, and this geometrical model is imported finite element analysis
In software, set up the finite element analysis model of described case of transmission；
Step 2, the selection of the driving source of case of transmission and excitation load determine, the power according to described case of transmission passes
Pass approach, select to bear load in this housing and deform maximum position as the driving source of this case of transmission and to apply to encourage
Power：In the frequency range of 0～1000Hz, with 1-5Hz as frequency step, respectively in the applying exciting force of described case of transmission
The X of point, Y, Z-direction apply frequency varying load exciting force, the described frequency varying load exciting force of setting and the excitation types that amplitude is 1N
The numerical relationship model of A, phase theta and time delay τ is
{ P (f) }={ A } * B (f) ei{φ(f)+θ-2πfτ}(1)
In formula (1), B (f) represents driving frequency change span, and φ (f) represents driving frequency angle change span；
Step 3, the setting of frequency response point, to bear the central point of load and the maximum position of deformation described in step 2
For encouraging source point input load, and it is imitative to carry out driving source initial point acceleration frequence responses using this as the collection point of frequency response
Very, obtain initial point acceleration and the frequency response relation curve reflecting described case of transmission；
Step 4, is emulated by described finite element analysis software, the X of final output load(ing) point, Y, Z-direction acceleration responsive value, so
The acceleration frequence responses figure being obtained according to above-mentioned emulation afterwards, the position obtaining the described deformation maximum of described case of transmission exists
The crest frequency point of tri- directional acceleration responses of X, Y, Z, judges driving frequency and the intrinsic frequency of described case of transmission
Degree of closeness and the probability of this case of transmission generation resonance；
Step 5, initial point dynamic stiffness frequency response analysis, set up acceleration and dynamic stiffness frequency response relational model
(2) in formula, a represents acceleration responsive, and F represents exciting force, KdRepresent dynamic stiffness, f represents acceleration frequency, by formula (2)
Acceleration frequency and dynamic stiffness relational model, obtain the characteristic curve of initial point dynamic stiffness and frequency response relation, basis further
This characteristic curve is found and is defined the frequency separation of not up to rigidity Design target；
Step 6, the frequency separation for not up to rigidity Design target carries out model analysis, soft using described finite element analysis
Part carries out the analytical calculation of mode and dynamic stiffness, obtains the modal characteristics of setpoint frequency section and obtains described from Mode Shape figure
Bear load and the specific deformation behaviour in position of deformation maximum, the described case of transmission amplitude of accurate determination is larger, dynamic stiffness
Weakness and the serious concrete structure position of deformation.
2. the method for utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature according to claim 1,
It is characterized in that：
Wherein, described three-dimensional drawing software be UG software, Solidworks software, Pro/e software, any in CATIA software
A kind of.
3. the method for utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature according to claim 1,
It is characterized in that：
Wherein, described finite element analysis software be Hyperworks software, ANSYS software, any one in ABAQUS software.
4. the method for utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature according to claim 1,
It is characterized in that：
Wherein, the described load and the position of deformation maximum of bearing is dead eye or suspension.
5. the method for utilization initial point dynamic stiffness specificity analysis case of transmission local deformation feature according to claim 1,
It is characterized in that：
Wherein, described in step 2, frequency step is preferably 2HZ.
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Cited By (3)
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| CN112749499A (en) * | 2020-12-30 | 2021-05-04 | 深圳市大地和电气股份有限公司 | Simulation method and device for quickly diagnosing NVH performance of motor structure |
| CN114329898A (en) * | 2021-11-30 | 2022-04-12 | 苏州浪潮智能科技有限公司 | Method, system and device for quickly identifying weak points of Tray disk structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106980739A (en) * | 2017-04-20 | 2017-07-25 | 上海汽车变速器有限公司 | Bear box load Simulation Methods based on equation distribution pressure |
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| CN112749499B (en) * | 2020-12-30 | 2024-04-05 | 深圳市大地和电气股份有限公司 | Simulation method and device for rapidly diagnosing NVH performance of motor structure |
| CN114329898A (en) * | 2021-11-30 | 2022-04-12 | 苏州浪潮智能科技有限公司 | Method, system and device for quickly identifying weak points of Tray disk structure |
| CN114329898B (en) * | 2021-11-30 | 2024-02-09 | 苏州浪潮智能科技有限公司 | Method, system and device for rapidly identifying weak points of Tray structure |
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