CN109186901A - A kind of automobile tow hook fixed point stiffness test method - Google Patents
A kind of automobile tow hook fixed point stiffness test method Download PDFInfo
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- CN109186901A CN109186901A CN201811065657.0A CN201811065657A CN109186901A CN 109186901 A CN109186901 A CN 109186901A CN 201811065657 A CN201811065657 A CN 201811065657A CN 109186901 A CN109186901 A CN 109186901A
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- fixed point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of automobile tow hook fixed point stiffness test methods, belong to technical field of vehicle detection.The specific steps are first constrain automobile body-in-white；Then the load electric cylinder of automobile tow hook fixed point rigidity test is installed as servo-drive loading unit；Pulling force load test is carried out to automobile tow hook fixed point by the default loading scheme of control system；According to vehicle difference, automobile tow hook fixed point model is different, selects different loading schemes；Power-displacement rigidity performance curve of loading procedure and uninstall process is made after the completion of load according to the data of collected power and displacement, while obtaining remaining deformation；The backward pass hull closure after equipment is normal according to power-up sequence is checked after the completion of test.The present invention is designed reasonable loading scheme, can accurately be tested automobile tow hook fixed point, obtained the accurate rigidity property of automobile tow hook fixed point based on vehicle body installation fixed point Static stiffness testing stand.
Description
Technical field
The present invention relates to a kind of automobile tow hook fixed point stiffness test methods, belong to technical field of vehicle detection.
Background technique
When developing a kind of new model or producing a kind of new car, need to the quiet of each component on automobile body-in-white
Rigidity is tested, to observe the deformation feelings that these components are occurred in the pressure and pulling force by different loads, different directions
Condition and the maximum pressure and pulling force that can bear.
The car puller hook of automobile is a kind of emergency set, in roadside breakdown can by car puller hook other trailers help
Under, it is moved to repair shop or safety area.During trailer, car puller hook needs to bear biggish pulling force, car puller hook it is strong
Degree influences this trailer and the safety by trailer.Therefore, it is necessary to the car puller hook fixed points to new car to carry out stiffness test.
In existing measurement method, by manually reading the numerical value of dial gauge and drawing line of deflection, heavy workload is easy band
Carry out human error, meanwhile, displacement measurement system and stress measurement system are completely independent, and experimenter needs to measure and handle two respectively
Class data, large labor intensity are inconvenient for operation.
In the prior art, had for the Static stiffness testing stand with vehicle body installation fixed point, for grinding Che Baiche
Constraint condition and load-up condition in practical work process are simulated in body Static stiffness test job, are fixed for testing vehicle body installation
Point Static stiffness can be used for test vehicle body outside surface sheet metal component sag resistant ability, but be only disclosed in the prior art
A kind of testing stand is not directed to the specific stiffness test method of automobile difference component.Therefore, Automobile Design teacher is not still
The significant points to automobile it can carry out rigidity test well.
Summary of the invention
The object of the present invention is to provide a kind of automobile tow hook fixed point rigidity test sides easy to operate, accuracy is high
Method.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of automobile tow hook fixed point stiffness test method is tested using vehicle body Static stiffness testing stand；The vehicle body is quiet
Stiffness test platform include the servo-drive loading unit being connect by digital-to-analogue output card with control mainboard, by digital-to-analogue input card with
The displacement sensor and force snesor of control mainboard connection, the load being connected by force snesor with servo-drive loading unit
Bar, the control system being connect with control mainboard and control cabinet, for the rocker arm adding carrier of Vertical loading test, by automobile when test
White body is arranged on the securing means；The fixed device packet has the workbench of several T shape mounting grooves and is fixed on work
The fixed bracket of several vehicle bodies on platform surface；Specifically include following steps,
Step 1, fixed car white body: fixed car white body: according to automobile tow hook fixed point stiffness test when CAE analysis
To the constraint requirements of automobile tow hook fixed point, adjustment constraint tooling makes automobile tow hook fixed point fixed constraint point and CAE
Analysis is consistent；
Step 2, test prepare: the load electric cylinder of installation automobile tow hook fixed point rigidity test loads single as servo-drive
Member, according to the position of load(ing) point when CAE analysis and quantity arrangement load electric cylinder and sensor；
Step 3 is loaded: the position for adjusting loading section connect load bar with automobile tow hook fixed point；It is by control
The default loading scheme of system carries out pulling force load test to automobile tow hook fixed point；According to vehicle difference, automobile tow hook is solid
It is different to pinpoint model, loading scheme is different；
Step 4, power-displacement rigidity performance curve that loading procedure is made according to the data of collected power and displacement and unloading
The power of process-displacement rigidity performance curve；Remaining deformation is obtained simultaneously；
Step 5, test are completed, and check the backward pass hull closure after equipment is normal according to power-up sequence.
Technical solution of the present invention further improvement lies in that: when being loaded in step 3, first according to the actual bit of load(ing) point
It sets, fills in the position coordinates of load(ing) point in the controls, the position for adjusting load electric cylinder by control system adds to load(ing) point
The load bar and car puller hook for carrying electric cylinder front end mount.
Technical solution of the present invention further improvement lies in that: loading force is gradually increased in step 3, in loading procedure force value become
Change amount is less than 50N/S, and loading force is up to 4000N~4500N.
Technical solution of the present invention further improvement lies in that: added in loading procedure with the increment of 10N/s~15N/s
It carries, the every increase 500N of loading force keeps 10s, and loading force keeps 15s after reaching maximum, then unloaded.
Technical solution of the present invention further improvement lies in that: check experiment data and standard in step 4 judge that car puller hook is solid
Whether fixed point rigidity meets the requirements.
Technical solution of the present invention further improvement lies in that: determine that car puller hook is fixed from whether deflection curve has mutation
Whether point Stiffness Distribution is suitable, if there is mutation illustrates that car puller hook fixed point Stiffness Distribution is poor.
Technical solution of the present invention further improvement lies in that: the standard that car puller hook fixed point meets test requirements document is to load
15mm is not to be exceeded in maximum displacement in the process, and remaining deformation should not exceed 5mm after unloading.
Technical solution of the present invention further improvement lies in that: power-displacement rigidity performance curve in step 4 is by control
System generates, and in power-displacement rigidity performance curve coordinate range setting, deflection is set as the examination of automobile tow hook fixed point rigidity
Testing middle sensor, there may be the ranges of displacement.
Technical solution of the present invention further improvement lies in that: the fixed bracket of the vehicle body is fixed on work by tommyhead bolt
On platform.
By adopting the above-described technical solution, the technical effect that the present invention obtains has:
The present invention by vehicle body install fixed point Static stiffness testing stand based on, devise reasonable loading scheme, using classification by
The mode of load is walked, the every increase 500N of loading force is kept for one end time；The loading scheme fixed to automobile tow hook can click through
The accurate test of row, so as to obtain the accurate rigidity property of automobile tow hook fixed point.
Test method of the invention sets 4000N~500N for the maximum value of loading force and keeps 20s, can test
The rigidity of hook attachment for trailer in the limiting case, so that the limit rigidity of car puller hook is obtained, the final peace guaranteed when car puller hook uses
Entirely.
High degree of automation of the present invention is convenient for manipulation, and measurement is accurate, can obtain the accurate true rigid of automobile tow hook
Performance data is spent, can guarantee the safety that car puller hook uses, moreover it is possible to provide scientific basis to automobile improvement for technical staff.
Detailed description of the invention
Fig. 1 is the schematic diagram when present invention is tested；
Fig. 2 is the power-displacement rigidity performance curve obtained after testing；
Wherein, 1, workbench, 2, load electric cylinders, 3, load bar, 4, hook, 5, car puller hook, 6, the fixed bracket of vehicle body.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described in further details the present invention:
The invention discloses a kind of automobile tow hook fixed point stiffness test methods, and the test method is with vehicle body Static stiffness testing stand
Based on, it devises specifically in the stiffness test method of automobile tow hook fixed point.It is specific as follows:
A kind of automobile tow hook fixed point stiffness test method is tested using vehicle body installation fixed point Static stiffness testing stand；
The vehicle body installation fixed point Static stiffness testing stand includes the servo-drive load being connect by digital-to-analogue output card with control mainboard
Unit, the displacement sensor being connect by digital-to-analogue input card with control mainboard and force snesor are driven by force snesor and servo
Load bar that dynamic loading unit is connected, the control system being connect with control mainboard and control cabinet, the level for being loaded
Adding carrier, when test on the securing means by vehicle body setting；The fixed device packet has the workbench 1 of several T shape mounting grooves
And it is fixed on the fixed bracket 6 of several vehicle bodies on 1 surface of workbench.In order to be adapted to the load to car puller hook, at 3 end of load bar
Portion's setting hook 4 is that will link up with 4 to keep mounting with car puller hook 5, and then carry out the load of power in test.
In the present invention, the fixed bracket 6 of vehicle body it is preferential be to be fixed on by tommyhead bolt on workbench 1.
Automobile tow hook fixed point stiffness test method of the invention, specifically includes following steps,
Step 1, fixed car white body: solid to automobile tow hook according to automobile tow hook fixed point stiffness test when CAE analysis
The constraint requirements of fixed point, adjustment constraint tooling, are consistent automobile tow hook fixed point fixed constraint point with CAE analysis.
Because designer carries out l-G simulation test usually using CAE software when automobile is developed, actual test and emulation will be kept herein
The parameter of test is consistent.
Step 2, test prepare: the load electric cylinder of installation automobile tow hook fixed point rigidity test adds as servo-drive
Carrier unit, according to the position of load(ing) point when CAE analysis and quantity arrangement load electric cylinder and sensor.This step will be loaded
The selection of electric cylinders 2, load electric cylinders 2 are the components that horizontal addload body generates loading force, and the maximum load power of load electric cylinders 2 needs big
In the value of preset maximum load power.When the carry out automobile tow hook fixed point rigidity test, usual maximum loading force is taken
4000N chooses the load electric cylinders that maximum load power is 5000N.
Step 3 is loaded；The spatial position for adjusting loading section first connects load bar and automobile tow hook fixed point
It connects；Then pulling force load test is carried out to automobile tow hook fixed point by the default loading scheme of control system；Not according to vehicle
Together, automobile tow hook fixed point model is different, and loading scheme is different.Particularly make to load the drive load bar 3 of electric cylinders 2 to trailer
Hook 5 carries out pulling force load；Loading force is gradually increased in step 3, and force value variable quantity is less than 50N/S in loading procedure, and loading force is most
Greatly 4000N~4500N.During loading, preferentially, keeping the increment of loading force is 10N/s~15N/s.In view of dragging
Vehicle hook is once use needs to bear biggish pulling force, in order to more really simulate actual state, by the maximum value of loading force
It is set as 4000N~4500N and keeps 20s, then unloaded, in this way can test hook attachment for trailer in the limiting case
Rigidity.Loading scheme in step 3 can be realized the authentic testing of the rigidity property for car puller hook.It is first when being loaded in step 3
First according to the physical location of load(ing) point, the position coordinates of load(ing) point are filled in control interface in the controls, are by control
To load(ing) point, the load bar and car puller hook for loading electric cylinder front end are mounted for the position of system adjustment load electric cylinder.
Above-mentioned loading scheme difference refers to the difference of specific loading force increment and maximum load power, needs according to vapour
The vehicle of vehicle and the model of car puller hook are specifically arranged.Loading scheme can be pre-configured into control system by technical staff
It needing use is chosen by automobile forming in system.
Step 4, power-displacement rigidity performance curve that loading procedure is made according to the data of collected power and displacement and
The power of uninstall process-displacement rigidity performance curve；Remaining deformation is obtained simultaneously.Particularly check experiment data and standard,
Judge whether car puller hook fixed point rigidity meets the requirements；Preferentially, mutation whether can determines trailer from deflection curve
Whether hook fixed point Stiffness Distribution is suitable, if there is mutation illustrates that car puller hook fixed point Stiffness Distribution is poor.Car puller hook fixed point
The standard for meeting test requirements document is that 15mm is not to be exceeded in maximum displacement during loading, and remaining deformation should not exceed after unloading
5mm.Power-displacement rigidity performance curve can be automatically generated by the software of control system, need to be arranged in the controls in advance
Power-displacement rigidity performance curve horizontal axis and horizontal axis coordinate range, the longitudinal axis and ordinate of orthogonal axes range.
Step 5, test are completed, and check the backward pass hull closure after equipment is normal according to power-up sequence.
Here is the specific embodiment tested using the test method:
It needs to be ready to vehicle body installation fixed point Static stiffness testing stand before testing first and completes the test job of testing stand, protect
Confirmatory test platform can work normally.The testing stand includes the servo-drive load list being connect by digital-to-analogue output card with control mainboard
Member, the displacement sensor being connect by digital-to-analogue input card with control mainboard and force snesor pass through force snesor and servo-drive
Load bar that loading unit is connected, the control system connecting with control mainboard and control cabinet, the level for being loaded add
Carrier.There is the testing stand control system to be able to carry out the data of power and the acquisition of displacement data.
First body of a motor car is fixed when test and is then loaded on the securing means.The fixed device includes that packet has
The workbench 1 of several T shape mounting grooves and the fixed bracket 6 of several vehicle bodies for being fixed on 1 surface of workbench.In test, vehicle body is solid
Fixed rack 6 is arranged 4, and the fixed bracket 6 of four vehicle bodies is fixed on the table using tommyhead bolt.
In order to be adapted to the load to car puller hook 5,3 end of load bar setting hook 4, test when will hook 4 with drag
Hitch 5 keeps mounting, and then carries out the load of power.
Schematic diagram shown in FIG. 1 to be, when carrying out load test, after testing stand and fixed device is ready i.e.
It can start to carry out automobile tow hook fixed point stiffness test, specifically include following steps,
Step 1, fixed car white body: solid to automobile tow hook according to automobile tow hook fixed point stiffness test when CAE analysis
The constraint requirements of fixed point, adjustment constraint tooling, are consistent automobile tow hook fixed point fixed constraint point with CAE analysis.
Step 2, test prepare: the load electric cylinder of installation automobile tow hook fixed point rigidity test adds as servo-drive
Carrier unit, according to the position of load(ing) point when CAE analysis and quantity arrangement load electric cylinder and sensor.Expect most in this step
Big loading force is 4000~4500N, therefore chooses the load electric cylinders that maximum load power is 5000N.
Step 3 is loaded；The position of adjustment loading section connect load bar with automobile tow hook fixed point；Make to add
Carrying electric cylinders 2 drives load bar 3 to carry out pulling force load to car puller hook 5；Loading force is incrementally increased from 0N to 4000N, is being loaded
Cheng Zhong, keeping the increment of loading force is 10N/s, allows to have fluctuation, it is ensured that the increment of loading force is less than 50N/s, if it is greater than this
Value stops load, adjustment load electric cylinders to normal stress state immediately.Loading force be 1000N, 1500N, 2000N, 2500N,
10s is kept when 3000N, 3500N, keeps 20s when reaching maximum load power 4000N.Then it is unloaded, by load when unloading
The decrement of power 10N/s carries out.
Step 4, the power-position for making loading procedure by the software of control system according to collected power and the data of displacement
Move power-displacement rigidity performance curve of rigidity property curve and uninstall process；Remaining deformation is obtained simultaneously.Check experiment number
According to standard, judge whether car puller hook fixed point rigidity meets the requirements.By regulation, car puller hook fixed point meets the mark of test requirements document
Standard is that 15mm is not to be exceeded in maximum displacement during loading, and remaining deformation should not exceed 5mm after unloading.In the test procedure
Power-displacement rigidity performance curve horizontal axis is set in the controls before formation curve for displacement and horizontal axis coordinate range
It is up to 14mm, the longitudinal axis is that loading force and ordinate of orthogonal axes range are up to 5000N.
Shown in Fig. 2 is power-displacement rigidity performance curve obtained in this time test, and what wherein leftmost curve indicated is
Power-displacement rigidity performance curve in loading procedure；What right side graph indicated is power-displacement rigidity performance in uninstall process
Curve.The maximum displacement shown in Fig. 2 is 12.8mm, and it is 0.6mm that deflection is participated in after unloading, is met the requirements.And curve does not have
There is mutation, illustrates that the car puller hook rigidity is preferable.
The control system of vehicle body installation fixed point Static stiffness testing stand of the invention can develop special control software,
It is directed to different vehicles in software and presets different loading schemes, when testing, is selected according to vehicle corresponding
Loading scheme is loaded automatically by control system control loading section.The part of data acquisition of testing stand being capable of real-time reception
The data of force snesor and displacement sensor are simultaneously shown, staff is facilitated to monitor in real time and adjust.
Test method of the invention is in such a way that classification gradually loads, first most according to the setting of the service condition of car puller hook
Big loading force is 4000N~4500N, and design loading force increment is 10N~15N, sufficiently simulates the use state of car puller hook；?
The every increase 500N of loading force is kept for one end time and keeps also keeping one end time when reaching maximum load power；The load side
Case can adequately realize the rigidity test for automobile tow hook fixed point, provide test basis for its improvement.
The present invention devises reasonable loading scheme based on vehicle body installation fixed point Static stiffness testing stand, can be right
Automobile tow hook fixed point is accurately tested, so as to obtain the accurate rigidity property of automobile tow hook fixed point.
Claims (9)
1. a kind of automobile tow hook fixed point stiffness test method is tested using vehicle body Static stiffness testing stand；The vehicle body
Static stiffness testing stand includes the servo-drive loading unit being connect by digital-to-analogue output card with control mainboard, by digital-to-analogue input card
The displacement sensor and force snesor that are connect with control mainboard, be connected by force snesor with servo-drive loading unit plus
Carry bar, the control system connecting with control mainboard and control cabinet, for the rocker arm adding carrier of Vertical loading test, feature exists
In: when test on the securing means by automobile body-in-white setting；The fixed device packet has the workbench of several T shape mounting grooves
And it is fixed on the fixed bracket of several vehicle bodies of table surface；
Specifically include following steps,
Step 1, fixed car white body: solid to automobile tow hook according to automobile tow hook fixed point stiffness test when CAE analysis
The constraint requirements of fixed point, adjustment constraint tooling, are consistent automobile tow hook fixed point fixed constraint point with CAE analysis；
Step 2, test prepare: the load electric cylinder of installation automobile tow hook fixed point rigidity test loads single as servo-drive
Member, according to the position of load(ing) point when CAE analysis and quantity arrangement load electric cylinder and sensor；
Step 3 is loaded: the position for adjusting loading section connect load bar with automobile tow hook fixed point；It is by control
The default loading scheme of system carries out pulling force load test to automobile tow hook fixed point；According to vehicle difference, automobile tow hook is solid
It is different to pinpoint model, loading scheme is different；
Step 4, power-displacement rigidity performance curve that loading procedure is made according to the data of collected power and displacement and unloading
The power of process-displacement rigidity performance curve；Remaining deformation is obtained simultaneously；
Step 5, test are completed, and check the backward pass hull closure after equipment is normal according to power-up sequence.
2. a kind of automobile tow hook fixed point stiffness test method according to claim 1, it is characterised in that: in step 3
When load, first according to the physical location of load(ing) point, the position coordinates of load(ing) point are filled in the controls, by control system tune
To load(ing) point, the load bar and car puller hook for loading electric cylinder front end are mounted for the position of whole load electric cylinder.
3. a kind of automobile tow hook fixed point stiffness test method according to claim 1, it is characterised in that: in step 3
Loading force is gradually increased, and force value variable quantity is less than 50N/S in loading procedure, and loading force is up to 4000N~4500N.
4. a kind of automobile tow hook fixed point stiffness test method according to claim 3, it is characterised in that: loading procedure
In loaded with the increment of 10N/s~15N/s, the every increase 500N of loading force keeps 10s, and loading force is kept after reaching maximum
Then 15s is unloaded.
5. a kind of automobile tow hook fixed point stiffness test method according to any one of claims 1 to 4, feature exist
In: check experiment data and standard in step 4 judge whether car puller hook fixed point rigidity meets the requirements.
6. a kind of automobile tow hook fixed point stiffness test method according to claim 5, it is characterised in that: from deflection
Whether curve has mutation to determine whether car puller hook fixed point Stiffness Distribution is suitable, if there is mutation illustrates that car puller hook fixed point is rigid
Degree distribution is poor.
7. a kind of automobile tow hook fixed point stiffness test method according to claim 6, it is characterised in that: car puller hook is solid
It is that 15mm is not to be exceeded in maximum displacement during loading that fixed point, which meets the standard of test requirements document, and remaining deformation is not answered after unloading
Greater than 5mm.
8. a kind of automobile tow hook fixed point stiffness test method according to claim 1, it is characterised in that: in step 4
Power-displacement rigidity performance curve generated by control system, in the setting of power-displacement rigidity performance curve coordinate range, deformation
Amount is set as in automobile tow hook fixed point stiffness test that there may be the ranges of displacement for sensor.
9. a kind of automobile tow hook fixed point stiffness test method according to claim 1, it is characterised in that: the vehicle body
Fixed bracket is fixed on the table by tommyhead bolt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811065657.0A CN109186901A (en) | 2018-09-13 | 2018-09-13 | A kind of automobile tow hook fixed point stiffness test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811065657.0A CN109186901A (en) | 2018-09-13 | 2018-09-13 | A kind of automobile tow hook fixed point stiffness test method |
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| CN110057520A (en) * | 2019-05-28 | 2019-07-26 | 上海金发科技发展有限公司 | A kind of auto parts and components testing machine for mechanical properties |
| CN110823600A (en) * | 2019-12-15 | 2020-02-21 | 安徽青松工具有限公司 | Test detection system of light automobile traction device |
| CN111797472A (en) * | 2020-06-24 | 2020-10-20 | 中国第一汽车股份有限公司 | CAE simulation automatic modeling method for rigidity of auxiliary frame connecting point |
| CN112197921A (en) * | 2020-09-22 | 2021-01-08 | 上海翼锐汽车科技有限公司 | Method for measuring local rigidity of wheel fender wheel arch mounting hole |
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