CN106840338A - A kind of dynamic load acquisition methods of twist-beam suspension core wheel - Google Patents
A kind of dynamic load acquisition methods of twist-beam suspension core wheel Download PDFInfo
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- CN106840338A CN106840338A CN201710041030.0A CN201710041030A CN106840338A CN 106840338 A CN106840338 A CN 106840338A CN 201710041030 A CN201710041030 A CN 201710041030A CN 106840338 A CN106840338 A CN 106840338A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
- G01G19/086—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles wherein the vehicle mass is dynamically estimated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The present invention relates to a kind of core wheel dynamic load acquisition methods of twist-beam suspension structure, comprise the following steps that：The first step：Load sensitivity analysis；Second step：Testing program is formulated and implemented；3rd step：Dynamic loads are gathered；4th step：Dynamic load is decoupled；5th step：Dynamic load is verified.The present invention is emulated by CAE and determines foil gauge measurement scheme, core wheel load is carried out respectively using loading equipemtn and load transducer with strain rating test, obtain straining the calibration coefficient with each load, the participation factors of each load are obtained by overall calibration coefficient matrix, and then test strain signal conversion is obtained into twist-beam suspension core wheel dynamic load time-domain signal.Relative to six square phase instrument, the present invention is because using the response of foil gauge measuring strain is pasted, so as to obtain twist-beam suspension core wheel load indirectly, its cost is relatively low, collection period is short, and preferable with the core wheel load uniformity that six square phase instrument is gathered.
Description
Technical field
The present invention relates to vehicle complete vehicle and the field of structural design of parts, more particularly to a kind of twist-beam suspension structure
Core wheel dynamic load acquisition methods.
Background technology
The structure design of vehicle complete vehicle and parts, research and development early stage need to layer by layer be tested by CAE analysis, optimization and DV experiments
Card, follow-up automobile reliability road test verification could be carried out after meeting design object, and wherein key link is quick obtaining
Core wheel dynamic load.
At present, carload is obtained and mainly uses semi analytical method, i.e., by six square phase collection wheel heart dynamic load, with reference to many
Body dynamics are emulated and iteration, and the core wheel load of collection is decomposed into each system parts, and the load as CAE analysiss of fatigue is defeated
Enter, carry out structural fatigue analysis and optimization.Vehicle traveling process Road face can be accurately measured using six-component sensor to encourage
Response at core wheel, its advantage is system stabilization, measuring accuracy high, has the disadvantage that the purchase of six square phase instrument and maintenance cost are high
Expensive, higher using threshold, adapter fabrication cycle is long, causes collection period long, it is difficult to ensure project loading analysis progress.Cause
This, using some procurement costs are relatively low, cycle is short alternative accurately obtains core wheel dynamic load relatively, with very existing
Real construction value.
The content of the invention
It is an object of the invention to provide a kind of twist-beam suspension core wheel dynamic load acquisition methods, solution is passed with six square phase
Measuring apparatus costliness, M R high cost and response that sensor measures the response at the core wheel of traveling process Road and produces
Collection period problem long, is CAE analysis, verification experimental verification while ensureing that twist-beam suspension core wheel dynamic load obtains precision
Load input is provided.
It is as follows to realize the technological means that goal of the invention is used：
A kind of dynamic load acquisition methods of twist-beam suspension core wheel, comprise the following steps that：
The first step：Load sensitivity analysis：Set up rear-suspension system finite element analysis model；And according to standard condition, adopt
Stress analysis is carried out to rear-suspension system finite element analysis model with Nonlinear Finite meta software, torsion beam is obtained in each standard work
Stress state under condition, is set out Load Sensitive stress point and its surface stress and cloud atlas.
Second step：Testing program is formulated and implemented：Stress state and cloud atlas according to torsion beam under each standard condition, knot
Wheatstone bridge feature is closed, torsion beam measuring strain piece paste position and group bridge scheme is formulated；Then, set up torsion beam and demarcate real
Thing stand, and set up overall calibration coefficient matrix according to test-bed nominal data；Then, checking is demarcated using vehicle assembling
Whether overall calibration coefficient matrix meets the condition of diagonal dominance；If it is not satisfied, then reformulate torsion beam measuring strain piece gluing
Patch position and group bridge scheme；If meeting, continue next step；
3rd step：Dynamic loads are gathered：The collection of automobile reliability road dynamic load is completed, torsion beam measuring strain is obtained
The dynamic strain signal and other internal signals of piece；
4th step：Dynamic load is decoupled：With reference to the overall calibration coefficient matrix and the measuring strain piece of the 3rd step of second step
Dynamic strain signal, completion is decoupled and obtains torsion beam suspension core wheel dynamic load；
5th step：Dynamic load is verified：According to the torsion beam suspension core wheel dynamic load that the 4th step is obtained, further complete
With joint efforts and special operation condition load verification, then by load check results be input into multi-simulation model, the output of contrast simulation model
The uniformity of the result dynamic load signal corresponding with the internal signal gathered in the 3rd step；If both uniformity are discontented with
Foot, jumps to second step and repeats flow；If both consistent sexual satisfactions, direct outputting torsion beam suspension core wheel three-dimensional is dynamically carried
Lotus.
Specifically, the rear-suspension system finite element analysis model includes torsion beam, damper, helical spring and bushing group
Into finite element analysis model.
Specifically, internal signal includes that rear axle left-and-right spiral spring displacement, rear axle or so spindle nose acceleration, rear axle or so subtract
Shake device power and gps signal.
Specifically, the circular of the dynamic load decoupling is：Assuming that m incentive action is had in structural member,
F is designated as respectivelyi, i=1,2...m set up n groups, and n=m response signal collecting units, are designated as Rj, j=1,2...n；By vector
Excitation and response signal are designated as respectivelyWith
It is separately applied on structural member when by m excitation, carries out the rating test under single excitation, then each excitation is recorded
N groups are responded, and the response signal vector extensions in final rating test are m × n ranks vector, and new response signal vector is designated as Rij,
Wherein i=1,2...m, j=1,2...n, set up matrix equation (3)：
Wherein, KijIt is calibration coefficient matrix, is the ratio of response signal and excitation；A is overall calibration coefficient matrix；It is overall
Calibration coefficient matrix should try one's best and meet diagonal matrix；
Structural member is installed in vehicle, loading spectrum collection experiment is carried out on road, the n groups set up during by demarcating are rung
Induction signal collecting unit obtains n group response signalsIt is designated as：
Overall calibration matrix A is inverted, is multiplied byObtain random excitation signal of the structural member on road
Excitation when early stage is demarcated is at core wheel, then the pumping signal for now obtainingDynamic load as at suspension core wheel
Lotus.
The present invention is emulated by CAE and determines foil gauge measurement scheme, is carried out respectively using loading equipemtn and load transducer
Core wheel load and strain rating test, obtain straining the calibration coefficient with each load, obtain each by overall calibration coefficient matrix
The participation factors of load, and then test strain signal conversion is obtained into twist-beam suspension core wheel dynamic load time-domain signal.Phase
For six square phase instrument, the present invention pastes the response of foil gauge measuring strain due to using, so as to obtain twist-beam suspension indirectly
Core wheel load, its cost is relatively low, collection period is short, and preferable with the core wheel load uniformity that six square phase instrument is gathered.
Brief description of the drawings
Fig. 1 is that dynamic load obtains flow chart；
Fig. 2 is rear-suspension system finite element analysis model schematic diagram；
Fig. 3 is rear-suspension system finite element analysis standard condition schematic diagram；
Fig. 4 is torsion beam stress state and cloud atlas in standard condition；
Fig. 5 is strain gauge adhesion schematic diagram；
Fig. 6 is that the rear overhang core wheel dynamic load that decoupling is obtained gathers signal contrast schematic diagram with six square phase.
Specific embodiment
The present invention is expanded on further with reference to accompanying drawing.
As shown in figure 1, a kind of dynamic load acquisition methods of twist-beam suspension core wheel, comprise the following steps that：
The first step：Load sensitivity analysis：Set up rear-suspension system finite element analysis model；And according to the mark shown in Fig. 3
Quasi- operating mode, stress analysis is carried out to rear-suspension system finite element analysis model using Nonlinear Finite meta software, obtains torsion beam
Stress state under each standard condition, is set out Load Sensitive stress point and its surface stress and cloud atlas, such as Fig. 4 institutes
Show.Torsion beam surface stress cloud atlas is shown in Fig. 4 (a), the optional position for pasting foil gauge is given.Fig. 4 (b) indicates torsion
Power beam surface stress situation, for determining Wheatstone bridge type.
Second step：Testing program is formulated and implemented：Stress state and cloud atlas according to torsion beam under each standard condition, knot
Wheatstone bridge feature is closed, torsion beam measuring strain piece paste position and group bridge scheme is formulated.Basic ideas are：X is set up to power
Full-bridge surveys tension and compression, and Y-direction power sets up full-bridge survey torsion, and it is bent that Z-direction power sets up full-bridge lateral bending.Strain gauge adhesion is in the surface of torsion beam 1
Bridge group 9 is demarcated as shown in figure 5, demarcating bridge group 7, core wheel side force including core wheel vertical force and demarcating bridge group 8, core wheel longitudinal force.With
Upper three bridge groups are all full-bridge, respectively lateral bending song, torsion and tension and compression.
Build torsion beam and demarcate stand in kind, the mode of action according to all directions power is different, independent in different application points respectively
Apply the normal loading of all directions, recording the strain signal of each strained channel, cylinder power using Dynamic Data Acquiring equipment believes
Number.With cylinder force signal as X-coordinate, each strain signal is Y-coordinate, and the curve of acquisition, its slope is calibration coefficient, is designated as
Kmn, wherein m is force signal sequence number, and n is strain signal sequence number.The calibration coefficient K obtained under different directions power is acted onmnSet up
Overall calibration coefficient matrix.
Subsequently, after the completion of vehicle assembling, using bandage according to standard condition imposed load, carry out qualitative demarcation and confirm.
The force sensor signals and each strain signal being connected with bandage are recorded by Dynamic Data Acquiring equipment.The power of acquisition is bent with strain
The slope of line, it is determined that under vehicle confined state, response of each strain signal to respective loads will be far above other load, that is, mark
Coefficient ratio >=10 are determined, so as to assess sensitivity and the degree of coupling of each strain signal.It is with Bench calibration difference, vehicle dress
With the state under state closer to dynamic load collection, because each flexible member is participated in, can be to the lower strain of each load effect
Response has considerable influence, therefore, vehicle demarcates the reasonability that can determine strained channel.It is overall checking to be demarcated using vehicle assembling
Whether calibration coefficient matrix meets the condition of diagonal dominance；If it is not satisfied, then reformulating torsion beam measuring strain piece sticky position
Put and organize bridge scheme；If meeting, continue next step；
3rd step：Dynamic loads are gathered：Driven according to the speed and gear of regulation at test site according to actual road test specification
Instruction carriage, completes the collection of automobile reliability road dynamic load, obtain torsion beam measuring strain piece dynamic strain signal and
Other internal signals.Internal signal includes rear axle left-and-right spiral spring displacement, rear axle or so spindle nose acceleration, rear axle or so damping
Device power and gps signal.
4th step：Dynamic load is decoupled：With reference to the overall calibration coefficient matrix and the measuring strain piece of the 3rd step of second step
Dynamic strain signal, completion is decoupled and obtains torsion beam suspension core wheel dynamic load.Rear axle core wheel load such as Fig. 6 of final decoupling
It is shown.In Fig. 6, left back core wheel longitudinal loading 10 is decoupled, decouple left back core wheel transverse load 11, decouple left back core wheel vertical load
12, decoupling off hind wheel heart longitudinal loading 13, decoupling off hind wheel heart transverse load 14, decoupling off hind wheel heart vertical load 15, six points
Power instrument surveys left back core wheel longitudinal loading 16, and six square phase instrument surveys left back core wheel transverse load 17, and it is vertical that six square phase instrument surveys left back core wheel
Load 18, six square phase instrument surveys off hind wheel heart longitudinal loading 19, and six square phase instrument surveys off hind wheel heart transverse load 20, and six square phase instrument is surveyed right
Core wheel vertical load 21, decouples left back core wheel longitudinal loading power spectrum 22 afterwards, and six square phase instrument surveys left back core wheel longitudinal loading power
Spectrum 23, decouples left back core wheel transverse load power spectrum 24, and six square phase instrument surveys left back core wheel transverse load power spectrum 25.
5th step：Dynamic load is verified：According to the torsion beam suspension core wheel dynamic load that the 4th step is obtained, further complete
With joint efforts and special operation condition load verification, then by load check results be input into multi-simulation model, the output of contrast simulation model
The uniformity of the result dynamic load signal corresponding with the internal signal gathered in the 3rd step；If both uniformity are discontented with
Foot, jumps to second step and repeats flow；If both consistent sexual satisfactions, direct outputting torsion beam suspension core wheel three-dimensional is dynamically carried
Lotus, and terminate flow.
Specifically, as shown in Fig. 2 rear-suspension system finite element analysis model includes torsion beam 1, damper 3, helical spring
5th, the finite element analysis model of the first connecting bushing 2, the second connecting bushing 4 and limited block 6 composition.
Specifically, the circular of the dynamic load decoupling is：Assuming that m incentive action is had in structural member,
F is designated as respectivelyi, i=1,2...m set up n groups, and n=m response signal collecting units, are designated as Rj, j=1,2...n；By vector
Excitation and response signal are designated as respectivelyWith
It is separately applied on structural member when by m excitation, carries out the rating test under single excitation, then each excitation is recorded
N groups are responded, and the response signal vector extensions in final rating test are m × n ranks vector, and new response signal vector is designated as Rij,
Wherein i=1,2...m, j=1,2...n, set up matrix equation (3)：
Wherein, KijIt is calibration coefficient matrix, is the ratio of response signal and excitation；A is overall calibration coefficient matrix；It is overall
Calibration coefficient matrix should try one's best and meet diagonal matrix；
Structural member is installed in vehicle, loading spectrum collection experiment is carried out on road, can by demarcating when the n that sets up
Group response signal collecting unit obtains n group response signalsIt is designated as：
Overall calibration matrix A is inverted, is multiplied byCan obtain random excitation signal of the structural member on road
Excitation when early stage is demarcated is at core wheel, then the pumping signal for now obtainingDynamic load as at suspension core wheel
Lotus.
Claims (4)
1. a kind of dynamic load acquisition methods of twist-beam suspension core wheel, it is characterised in that comprise the following steps that：
The first step：Load sensitivity analysis：Set up rear-suspension system finite element analysis model；And according to standard condition, using non-
Linear finite software carries out stress analysis to rear-suspension system finite element analysis model, and acquisition torsion beam is under each standard condition
Stress state, Load Sensitive stress point and its surface stress and cloud atlas is set out；
Second step：Testing program is formulated and implemented：Stress state and cloud atlas according to torsion beam under each standard condition, with reference to favour
Stone electric bridge feature, formulates torsion beam measuring strain piece paste position and group bridge scheme；Then, set up torsion beam and demarcate platform in kind
Frame, and set up overall calibration coefficient matrix according to test-bed nominal data；Subsequently, checking is demarcated totally using vehicle assembling
Whether calibration coefficient matrix meets the condition of diagonal dominance；If it is not satisfied, then reformulating torsion beam measuring strain piece sticky position
Put and organize bridge scheme；If meeting, continue next step；
3rd step：Dynamic loads are gathered：The collection of automobile reliability road dynamic load is completed, torsion beam measuring strain piece is obtained
Dynamic strain signal and other internal signals；
4th step：Dynamic load is decoupled：With reference to the overall calibration coefficient matrix and the measuring strain piece dynamic of the 3rd step of second step
Strain signal, completion is decoupled and obtains torsion beam suspension core wheel dynamic load；
5th step：Dynamic load is verified：According to the torsion beam suspension core wheel dynamic load that the 4th step is obtained, further complete to make a concerted effort
And the verification of special operation condition load, load check results are then input into multi-simulation model, the output result of contrast simulation model
The uniformity of the dynamic load signal corresponding with the internal signal gathered in the 3rd step；If both uniformity are unsatisfactory for, jump
Go to second step and repeat flow；If both consistent sexual satisfactions, direct outputting torsion beam suspension core wheel three-dimensional dynamic load.
2. dynamic load acquisition methods of a kind of twist-beam suspension core wheel according to claim 1, it is characterised in that：Institute
State finite element analysis mould of the rear-suspension system finite element analysis model including torsion beam, damper, helical spring and bushing composition
Type.
3. dynamic load acquisition methods of a kind of twist-beam suspension core wheel according to claim 1, it is characterised in that：Institute
Stating internal signal includes rear axle left-and-right spiral spring displacement, rear axle or so spindle nose acceleration, rear axle or so damper power and GPS letters
Number.
4. a kind of dynamic load acquisition methods of twist-beam suspension core wheel according to claim 1, it is characterised in that institute
Stating the circular of dynamic load decoupling is：Assuming that having m incentive action in structural member, F is designated as respectivelyi, i=1,
2...m, n groups, and n=m response signal collecting units are set up, R is designated asj, j=1,2...n；Will excitation and response signal by vector
It is designated as respectivelyWith
It is separately applied on structural member when by m excitation, carries out the rating test under single excitation, then each excitation records n groups
Response, the response signal vector extensions in final rating test are m × n ranks vector, and new response signal vector is designated as Rij, wherein
I=1,2...m, j=1,2...n, set up matrix equation (3)：
Wherein, KijIt is calibration coefficient matrix, is the ratio of response signal and excitation；A is overall calibration coefficient matrix；It is overall to demarcate
Coefficient matrix should try one's best and meet diagonal matrix；
Structural member is installed in vehicle, loading spectrum collection experiment is carried out on road, the n groups response letter set up during by demarcating
Number collecting unit obtains n group response signalsIt is designated as：
Overall calibration matrix A is inverted, is multiplied byObtain random excitation signal of the structural member on road
Excitation when early stage is demarcated is at core wheel, then the pumping signal for now obtainingDynamic load as at suspension core wheel.
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| CN108051068A (en) * | 2015-11-21 | 2018-05-18 | 马俊 | One kind is based on four-way weight measurement antidote |
| CN108152053A (en) * | 2017-12-26 | 2018-06-12 | 北京理工大学 | A kind of method of the automobile load spectrum discrimination based on axle structure stress test |
| CN108829985A (en) * | 2018-06-21 | 2018-11-16 | 上海理工大学 | A kind of suspension dynamic K&C testing stand unidirectionally loads the preparation method of spectrum |
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