CN205607660U - Automotive suspension shock absorber energy characteristics test system - Google Patents
Automotive suspension shock absorber energy characteristics test system Download PDFInfo
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- CN205607660U CN205607660U CN201620311625.4U CN201620311625U CN205607660U CN 205607660 U CN205607660 U CN 205607660U CN 201620311625 U CN201620311625 U CN 201620311625U CN 205607660 U CN205607660 U CN 205607660U
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Abstract
The utility model creatively discloses an automotive suspension shock absorber energy characteristics test system, this system includes the support body, sets up and to produce the crank connecting rod sliding block mechanism of sinusoidal motion on the support body for the anchor clamps of fixed buffer and erection support down, speedtransmitter, and be used for measuring the force transducer of damping force, crank connecting rod sliding block mechanism is used for realizing the drawing and the pressure stroke reciprocating motion of shock absorber, has the crank, and camshaft connecting rod can carry out the circumference motion round another extreme point of articulate, thereby camshaft connecting rod's top is connected the drive shock absorber with lower erection support and is made the up -and -down motion along with camshaft connecting rod, and the slider carries out up -and -down motion under camshaft connecting rod's drive. Be applied to finding the solution and maring of shock absorber indicator card area based on automotive suspension shock absorber energy characteristics test system with computer image recognition technology to a shock absorber absorbed energy quantitative analysis method is proposed, for detecting, the performance of shock absorber provides new evaluation method and quantitative criteria.
Description
Technical field
The invention relates to shock absorber of automobile suspension field, is specifically related to a kind of shock absorber of automobile suspension energy response and surveys
Test system.
Background technology
Vibroshock is damping element main in automotive suspension, is installed in parallel with flexible member, and its performance is directly connected to
The comfortableness of automobile and safety.Automotive suspension is to ensure that the crucial assembly of vehicle running smoothness and operational stability, vibration damping
Device carries the biggest responsibility as core devices therein.Therefore, no matter for the detection before dispatching from the factory or dimension in the future
Repairing maintenance, the performance of vehicle shock absorber and the research of failure mode are the most necessary.
Vibroshock, when producing and keep in repair, is required for carrying out its performance clear and definite through test.The performance of vibroshock is the most logical
Cross what the external characteristics of vibroshock characterized.Indicator card and the speed characteristic figure of vibroshock can be obtained by vibroshock dynamometer machine.
Vibroshock product whether existing defects can be judged according to the shape of indicator card curve, i.e. analyze whether vibroshock lost efficacy.
At present, can test maximum tension resistance by vibroshock dynamometer machine and maximum compression resistance the two has been joined
Number whether qualified, its recognition method be " threshold method ", exceeded set by " threshold value is " the most defective.The application of this recognition methods
The most single, the defect type characterized by maximum tension resistance, resistance to compression pression can only be identified.Once run into maximum tension resistance
Power, resistance to compression pression, all in acceptability limit, but also exist the indicator card of other defect type, and existing detection mode just cannot be automatic
Identify.In this case, need nonetheless remain for relying on the most online mode to check one by one, enter according to the subjective experience of testing staff
Row Classification and Identification.
Can be seen that production in enormous quantities and the detection relying on the mode of artificial cognition to be unfavorable for vibroshock, current vibroshock shows
The automatic identification function that merit machine is configured is the most coarse.And most points that vibroshock is tested in recovery, compression travel
Damping characteristic cannot be embodied, and vibroshock in a round trip, the amount of decayed Vehicular vibration is the most also
It is left in the basket.
Summary of the invention
The invention purpose is to provide a kind of shock absorber of automobile suspension energy response test system, and this system is used for vibration damping
The test of device energy response, uses crank connecting rod sliding block mechanism that vibroshock is applied excitation；Use velocity sensor test vibration damping
The displacement of device or speed；Use sound state damping force and the shock loading of force transducer test vibroshock.The most permissible by test
Obtain the outer energy response of vibroshock, the identification ability that whether vibroshock is existed performance distortion can be improved again, improve crank even
Whether bar slide block mechanism, the clamping of vibroshock and mechanism thereof exist the identification ability in gap.Shock absorber of automobile suspension energy response
Computer image recognition technology is applied to vibroshock based on shock absorber of automobile suspension energy response test system and shows by metering method
The solving and demarcating of the merit area of pictural surface, and a kind of shock absorber energy quantitative analysis method is proposed, the performance for vibroshock detects
New evaluation methodology and quantitative criteria are provided.
The technical scheme that the invention uses is:
Shock absorber of automobile suspension energy response test system, including support body, is arranged on support body and can produce sinusoidal motion
Crank connecting rod sliding block mechanism, the fixture for fixed buffer upper lift ring and the lower peace for fixed buffer lower lift ring during test
Dress bearing, velocity sensor, and for measuring the force transducer of damping force；Described crank connecting rod sliding block mechanism subtracts for realization
Stretching and the compression travel of device of shaking moves back and forth, and has crank, and one end of crank is fixed on support body, and the other end of crank is with bent
Axle connecting rod bottom is connected, and described crankshaft-link rod can carry out circumferential movement around the other end point of crank；The top of crankshaft-link rod
It is connected with lower erection support thus drives vibroshock to move up and down along with crankshaft-link rod, crankshaft-link rod is additionally provided with matched
Slide block, described slide block pumps under the drive of crankshaft-link rod；Described velocity sensor is arranged on bent axle even
Rotated the speed produced by crank for test on bar.
Described shock absorber of automobile suspension energy response test system, described force transducer is fixed on the upper bracket of support body
On, and connect with fixture；Described force transducer includes stain foil force sensor and piezoelectric force transducer, described strain chip
Force transducer and piezoelectric force transducer series connection.
Described shock absorber of automobile suspension energy response test system, also includes vibroshock side force device, described vibration damping
Device side force device is fixing with vibroshock to be connected, and has side force ring, and the roller for supporting cable wire being packed on support body, institute
The one end stating side force ring is fixedly connected on the middle part of vibroshock, and the other end of side force ring is connected with cable wire, and cable wire is by rolling
Wheel connects counterweight；When vibroshock moves up and down with following crank connecting rod sliding block mechanism, side force ring drives counterweight by cable wire
Make little scope with vibroshock to move up and down.
Shock absorber of automobile suspension energy response metering method, applies above-mentioned shock absorber of automobile suspension energy response to test system
System, comprises the following steps:
1) vibroshock mathematical model is set up, including setting up shock absorbers compression stroke and restoring stroke mathematical model；
2) set up damper indicator diagram area mathematical model, test system based on shock absorber of automobile suspension energy response,
Under exciting stroke and frequency, the compression travel of vibroshock and recovery stroke produce and show merit curve, and this shows the figure that merit curve forms
I.e. damper indicator diagram, this shows the area i.e. damper indicator diagram area that merit curve is surrounded；Build based on vibroshock mathematical model
Vertical damper indicator diagram area mathematical model；
3) indicator card area energy is demarcated,
3.1) utilize computer image recognition technology that damper indicator diagram is carried out image procossing based on Matleb platform, bag
Including image reading, image gray processing and image binaryzation, detection damper indicator diagram pixel number also solves vibroshock and shows merit
The area of pictural surface；
3.2) with LabVIEW, damper indicator diagram area mathematical model is programmed, and utilize vibroshock to subtract at automotive suspension
The velocity amplitude of the several sampled points gathered in device energy response test system of shaking and damping force Value Data, calculate and solve vibroshock
The gross energy absorbed in an impulse stroke.
Described shock absorber of automobile suspension energy response metering method, step 1) to set up vibroshock mathematical model be according to subtracting
Shake device working mechanism, sets up the piecewise mathematical model before and after each stroke valve opening of vibroshock respectively；
In impulse stroke, damping force suffered by piston is:
F=P1(Ah-Ag)-P2·Ah+f1 (1)
The flow that fluid flows into cavity of resorption from epicoele is Q:
Q=(Ah-Ag)vl (2)
It is Q that oil storage chamber fluid compensates the flow of inflow working cylinder cavity of resorptionc:
Qc=Ag·vl (3)
In formula: F is damping force N that vibroshock is subject to；AhFor piston area m2；AgFor rod areas m2；vlFor restoring row
Movement velocity m/s of journey piston；P1Pressure Mpa for working cylinder epicoele；P2The pressure Mpa of working cylinder cavity of resorption；f1Suffered by piston
Frictional force N；
1.1) recovery stroke mathematical model is set up
1.1.1) mathematical model before stroke valve opening is restored
Assuming when vibroshock normally works that oil sealing is airtight and without fluid leakage phenomenon, shock absorber oil is only from the epicoele of working cylinder
On piston, rebuilt valve enters working cylinder cavity of resorption, according to fluid train principle of parallel,
Fluid flows into the flow Q of cavity of resorption by restoration valve component1For:
Oil storage chamber fluid is Q by compensating the flow flowing into working cylinder cavity of resorptionc1:
According to fluid equation of continuity by Q=Q1, Qc=Qc1:
Then damping force F suffered by valve opening secondary piston1It is represented by:
In formula: CdFor fluid discharge coefficient；AmFor valve body throttle hole area m2；ρ is fluid density Kg/m3；AnFor recuperation valve
Throttle hole area m2；P3For oil storage chamber pressure Mpa；
1.1.2) mathematical model after stroke valve opening is restored
Along with restoring the increase of piston speed in stroke, the pressure of working cylinder epicoele is also gradually increased, when epicoele fluid pressure
Power raises and more than when bearing pressure of valve block in restoration valve component, restores valve block deformation and produces valve opening state, now vibration damping
Device enters the damping state after valve opening；
After valve opening, fluid is deformed upon, by working cylinder epicoele normal open hole on piston rebuilt valve and valve block, the ring formed
It is Q that shape gap enters the flow of cavity of resorption generation2:
In formula, A2The gap area m of generation is deformed upon for valve block2, according to fluid equation of continuity by Q=Q2:
Then damping force F suffered by valve opening back piston2It is represented by:
1.2) foundation of compression travel mathematical model
The mathematical model establishing method of the mathematical model of shock absorbers compression stroke and recovery stroke is with step 1.1), according to work
Plug movement velocity and damping force generation type set up respectively before valve opening with valve opening rear shock absorber mathematical model.
Described shock absorber of automobile suspension energy response metering method, step 2) damper indicator diagram area is divided into upper and lower two
Part, what the upper part being respectively showing of restoring that stroke produces merit curve surrounding and shock absorbers compression stroke produced shows that merit curve encloses
The lower part become, can be considered micro-displacement ds and instantaneous damper power FiThe area accumulation sum of constituted rectangular element；
Time t used by single for vibroshock recovery stroke is divided into n equal portions, owing to the exciting form of dynamometer machine is sinusoidal sharp
Encourage signal, velocity sensor can survey crank rotation generation speed characteristics, i.e. damper piston speed characteristics is:
V=2 π fRcos (2 π ft)=π fDcos (2 π ft) (11)
In formula: f is excited frequency Hz of input signal；R is crank length mm；D is vibroshock total kilometres mm；
Damper piston placement property by its speed characteristics expression formula integration obtain for:
In formula, S is damper piston displacement,
The piston speed of service of i-th time point and i+1 time point, its table can be recorded by vibroshock velocity sensor
Reach formula to be respectively as follows:
vi=π fDcos (2 π fti) (13)
vi+1=π fDcos (2 π fti+1) (14)
Vibroshock velocity expression is quadratured the small position between available i-th time point and i+1 time point
Moving ds expression formula is
To the excited frequency that fixed piston is certain, shock absorber of automobile suspension energy response test system can collect two
Corresponding data, i.e. piston movement speed νiAnd vibroshock instantaneous damper power Fi, FiExpression formula is in step 1) in mathematical model
Derive；Using i-th with the average of the instantaneous damper power corresponding to i+1 point as the height of rectangular element, the area of single rectangle
It is represented by:
Ali=Flσds (16)
In formula: AliFor the area of rectangular element, N mm；For average damping force, N；
Therefore, restore stroke and show that the area that merit curve surrounds is:
It shows the area A that merit curve surrounds in like manner can to seek compression travely, therefore this damper indicator diagram area can represent
For:
A=Al+Ay (18)。
Described shock absorber of automobile suspension energy response metering method, step 3.1) specifically include following steps:
3.1.1) based on Canny edge detection algorithm, vibroshock is shown that merit curve carries out rim detection, detect this and show that merit is bent
Whether line smooths, and Canny algorithm can be to aim curve smoothing processing, and its method is to use Gaussian function:
In formula, σ is that Gaussian filter smoothness controls parameter；
3.1.2) curve after smoothing uses first order differential operator, it is thus achieved that the gradient magnitude at each pixel and direction, point
(i, j) the partial derivative G in 2 directions, placex(i, j) and Gy(i j) is respectively as follows:
Gx(i, j)=[I (i, j+1)-I (and i, j)+I (i+1, j+1)-I (i+1, j)]/2 (20)
Gy(i, j)=[I (and i, j)-I (i+1, j)+I (i, j+1)-I (i+1, j+1)]/2 (21)；
3.1.3) by refine each pixel gradient magnitude image, can accurately identify and show merit curved edge line, non-greatly
Value suppression the most only need to retain the local maximum of amplitude；
3.1.4) use Canny operator to detect from candidate marginal and connect and obtain final edge.
Described shock absorber of automobile suspension energy response metering method, step 3.1.3) it is specially Canny operator in gradient
In magnitude image G with point (i, j) centered by 3 × 3 neighborhood in carry out interpolation arithmetic, if point (i, j) place gradient magnitude G (i,
J) less than adjacent interpolation, then (i is j) non-edge point, the most then can be considered candidate marginal, thus obtain this pixel
Candidate edge curve image.
Described shock absorber of automobile suspension energy response metering method, step 3.1.4) it is specially and chooses according to feature of image
Two rational threshold values, respectively high threshold and Low threshold, then in candidate edge curve image to any pixel point (i, j)
Detect, if (i, j) (i, j) more than selected high threshold, can be regarded as edge to gradient magnitude G to detected pixel
Point；If its value contrary is less than Low threshold, then determine that it is non-edge point；If the picture that gradient magnitude is between high-low threshold value
Vegetarian refreshments, can first be regarded as doubtful marginal point, then according to edge connectivity pair its judge, if this pixel is adjacent
Pixel exists marginal point, then it is assumed that this pixel is also marginal point, be otherwise non-edge point.
The invention has the advantages that
The invention shock absorber of automobile suspension energy response test system includes the crank connecting link that can produce sinusoidal motion
Fixture and the lower erection support of lower lift ring on fixed buffer when slide block mechanism, test, measure damping force and the biography of speed displacement
Sensor；Crank connecting rod sliding block mechanism can realize vibroshock stretching and move back and forth with compression travel, and crank one end fixes, and connecting rod can be around
Crank other end point and carry out circumferential movement, band movable slider pumps.
Force transducer is connected with fixture；Including stain foil force sensor and piezoelectric force transducer, two sensors is connected
Together, utilize strain chip and piezoelectric force transducer own characteristic, to the static force produced during vibroshock performance test and
Shock loading is effectively measured.Stain foil force sensor is used for realizing vibroshock static force, quasi-static force test；Due to pressure
The own characteristic of electric-type sensor, after piezoquartz pressurized, its surface produces electric charge, and under dynamic alternate stress effect, electric charge can
The voltage certain with supply measuring circuit or electric current, be therefore suitable for the test of vibroshock dynamic force, and measurable vibroshock null
Journey and show merit curvilinear distortion phenomenon.It is arranged on the speed/displacement transducer at toggle two ends for identifying piezoelectric forces
The direction of sensor force value, can differentiate its force value results from which stretching or compression travel of shock absorber movement, can effectively measure
Go out the working clearance between each parts of this system, and the wearing clearance of long-term work Hou Ge mechanism, system is tieed up by self
Protect.
The counterweight in device side force device that shakes can arbitrarily can be changed according to the size of car load demand side force, counterweight
Size can affect the internal fluid friction of vibroshock.When vibroshock moves up and down with following crankshaft-link rod when, cable wire also can
With the little range motion of vibroshock.This side force device can preferably simulate vibroshock duty on car load.
Accompanying drawing explanation
Fig. 1 is damper indicator diagram area
Fig. 2 is one to have distortion damper indicator diagram
Fig. 3 is image binaryzation rear shock absorber indicator card shown in Fig. 2
Fig. 4 LabVIEW flow chart
Fig. 5 energy computation results figure
Fig. 6 is that embodiment shock absorber of automobile suspension energy response tests system schematic.
Fig. 7 is side force device working state schematic representation in embodiment shock absorber of automobile suspension energy response test system.
Wherein: 1-upper bracket, 2-stain foil force sensor, 3-piezoelectric force transducer, 4-fixture, 5-vibroshock, 6-
Lower erection support, 7-slide block, 8-connecting rod, 9-velocity sensor, 10-crank, 11-side force ring, 12-cable wire, 13-roller, 14-weight
Code.
Detailed description of the invention
Embodiment shock absorber of automobile suspension energy response test system,
Include support body as shown in Figures 6 and 7, be arranged on support body the crank connecting rod sliding block mechanism that can produce sinusoidal motion, survey
Fixture 4 for fixed buffer 5 upper lift ring and the lower erection support 6 for fixed buffer 5 lower lift ring, velocity pick-up during examination
Device 9, and for measuring the force transducer of damping force；Described crank connecting rod sliding block mechanism for realize the stretching of vibroshock 5 with
Compression travel moves back and forth, and has crank 10, and one end of crank 10 is fixed on support body, the other end of crank 10 and crankshaft-link rod
8 bottoms are connected, and described crankshaft-link rod 8 can carry out circumferential movement around the other end point of crank 10；The top of crankshaft-link rod 8 with
Lower erection support 6 connects thus drives vibroshock 5 to move up and down along with crankshaft-link rod 8, crankshaft-link rod 8 is additionally provided with and joins therewith
The slide block 7 closed, described slide block 7 pumps under the drive of crankshaft-link rod 8；Described velocity sensor 9 is arranged on
Rotated the speed of generation by crank 10 for test on crankshaft-link rod 8.Described force transducer is fixed on the upper bracket 1 of support body,
And connect with fixture 4；Described force transducer includes stain foil force sensor 2 and piezoelectric force transducer 3, described strain chip
Force transducer 2 and piezoelectric force transducer 3 are connected.
This test system, also includes vibroshock side force device, and described vibroshock side force device is fixing with vibroshock 5 even
Connecing, have side force ring 11, and the roller 13 for supporting cable wire 12 being packed on support body, one end of described side force ring 11 is fixed
Being connected to the middle part of vibroshock 5, the other end of side force ring 11 is connected with cable wire 12, and cable wire 12 connects counterweight by roller 13
14；When vibroshock moves up and down with following crank connecting rod sliding block mechanism, side force ring 11 by cable wire 12 drive counterweight 14 with
Vibroshock 5 is made little scope and is moved up and down.
Operation principle, this system is afterburning in the piston rod of vibroshock 5 so that it is move back and forth.Measure vibroshock model center building
Curve characteristic uses sinusoidal excitation mode, makes damper piston by simple harmonic quantity regular movement.
This system test is: shock absorber movement mechanical energy=damping force × displacement；Vibroshock power consumption=damping force ×
Speed.
Embodiment shock absorber of automobile suspension energy response metering method
Test system based on above-mentioned shock absorber of automobile suspension energy response, comprise the following steps:
1) vibroshock mathematical model is set up: set up shock absorbers compression stroke and restore stroke mathematical model；
According to the working mechanism of vibroshock, owing to piston rod is relative to the difference of working cylinder movement velocity, in piston assembly
The compression valve sheet restored in valve block and bottom valve assembly has different apertures, can have not producing damping force during reciprocating motion of the pistons
Same impact, it is therefore desirable to set up the piecewise mathematical model before and after each stroke valve opening of vibroshock respectively.
In impulse stroke, damping force suffered by piston is:
F=P1(Ah-Ag)-P2·Ah+f1 (1)
The flow that fluid flows into cavity of resorption from epicoele is Q:
Q=(Ah-Ag)vl (2)
It is Q that oil storage chamber fluid compensates the flow of inflow working cylinder cavity of resorptionc:
Qc=Ag·vl (3)
In formula: F is the damping force that vibroshock is subject to, N；AhFor piston area, m2；AgFor rod areas, m2；vlFor restoring
The movement velocity of stroke piston, m/s；P1For the pressure of working cylinder epicoele, Mpa；P2The pressure of working cylinder cavity of resorption, Mpa；f1For work
Plug friction, N.
1.1) foundation of stroke mathematical model is restored
1.1.1) mathematical model before valve opening
Assuming when vibroshock normally works that oil sealing is airtight and without fluid leakage phenomenon, shock absorber oil is only from the epicoele of working cylinder
On piston, rebuilt valve enters working cylinder cavity of resorption, according to fluid train principle of parallel,
The flow that fluid flows into cavity of resorption by restoration valve component is represented by Q1:
Oil storage chamber fluid is Q by compensating the flow flowing into working cylinder cavity of resorptionc1:
(4), in (5) formula: CdFor fluid discharge coefficient；AmFor valve body throttle hole area, m2；ρ is fluid density, Kg/m3；
AnFor recuperation valve throttle hole area, m2；P3For oil storage chamber pressure, Mpa.
Obtain according to fluid equation of continuity:
Then damping force F1It is represented by:
1.1.2) mathematical model after valve opening
Along with restoring the increase of piston speed in stroke, the pressure of working cylinder epicoele is also gradually increased, when epicoele fluid pressure
Power raises and more than when bearing pressure of valve block in restoration valve component, restores valve block deformation and produces valve opening state, now vibration damping
Device enters the damping state after valve opening.
After valve opening, fluid is deformed upon, by working cylinder epicoele normal open hole on piston rebuilt valve and valve block, the ring formed
It is Q that shape gap enters the flow of cavity of resorption generation2:
In formula, A2The gap area of generation, m is deformed upon for valve block2.Obtain according to fluid equation of continuity:
Then damping force F suffered by valve opening back piston2It is represented by:
1.2) foundation of compression travel mathematical model
The mathematical model of shock absorbers compression stroke and the mathematical model establishing method similar synchronization rapid 1.1 restoring stroke), root
According to piston movement speed and damping force generation type set up respectively before valve opening with valve opening rear shock absorber mathematical model, particularly as follows:
1.2.1) mathematical model before compression travel valve opening
Before compression valve valve opening, piston is in low-speed motion state, now fluid by the normal open hole in piston compression valve and
Flowing valve valve block circulation gap produces damping force.Compression valve valve block normal open hole throttling and flowing valve valve block circulation gap it is believed that
Broadly fall into thin wall small hole throttling.
Flowed into the flow Q of epicoele by flowing valve valve block circulation gap by cavity of resorption3For:
The flow being flowed into shoe cream room by compression valve normal open hole by cavity of resorption is Q4:
Obtain according to fluid equation of continuity:
Then damping force F3It is represented by:
In formula: A1The gap area m of generation is deformed upon for flowing valve valve block2；A3For cross section, compression valve normal open hole on piston
Long-pending m2；
1.2.2) mathematical model after compression travel valve opening
When piston is in high-speed motion state, the compression valve valve block deformation of vibroshock forms annular slot throttling, now oil
Liquid enters shoe cream room by the annular slot that the normal open hole in piston compression valve and valve block deformation are formed and produces damping force.
Its flow is Q5:
According to fluid equation of continuity by obtaining:
Then damping force F4It is represented by:
In formula, VyFor restoring the movement velocity of stroke piston, A4The gap area of generation is deformed upon for compression valve block.
2) damper indicator diagram area mathematical model is set up
Described damper indicator diagram area is to test system, at certain exciting based on shock absorber of automobile suspension energy response
Under stroke and frequency, the compression travel of vibroshock and recovery stroke produce and show merit curve, the area that this curve is surrounded；Based on subtracting
Shake this damper indicator diagram area mathematical model of device Mathematical Models；
The summation of damper indicator diagram area A1 Yu A2 as shown in Figure 1.Its meaning is to represent that vibroshock is through a recovery
With compression travel, the damping force decay body vibrations work done that it produces, the big I of its value characterizes the energy dose-effect of vibroshock
Can, both vibroshock decay vibrational energy efficiency and abilities.Indicator card area is divided into upper and lower two parts, can be considered micro-displacement ds and
Instantaneous damper power FiThe area accumulation sum of constituted rectangular element.
Time t used by single for vibroshock recovery stroke is divided into n equal portions, owing to the exciting form of dynamometer machine is sinusoidal sharp
Encourage signal, velocity sensor can survey crank rotation generation speed characteristics, i.e. damper piston speed characteristics is:
V=2 π fRcos (2 π ft)=π fDcos (2 π ft) (18)
In formula: f is excited frequency Hz of input signal；R is crank length mm；D is vibroshock total kilometres mm；
Damper piston placement property by its speed characteristics expression formula integration obtain for:
In formula, S is damper piston displacement,
The piston speed of service of i-th time point and i+1 time point, its table can be recorded by vibroshock velocity sensor
Reach formula to be respectively as follows:
vi=π fDcos (2 π fti) (20)
vi+1=π fDcos (2 π fti+1) (21)
Vibroshock velocity expression is quadratured the small position between available i-th time point and i+1 time point
Moving ds expression formula is
To the excited frequency that fixed piston is certain, shock absorber of automobile suspension energy response test system can collect two
Corresponding data, i.e. piston movement speed νiAnd vibroshock instantaneous damper power Fi, FiExpression formula is in step 1) in mathematical model
Derive；Using i-th with the average of the instantaneous damper power corresponding to i+1 point as the height of rectangular element, the area of single rectangle
It is represented by:
Ali=Flσds (23)
In formula: AliFor the area of rectangular element, N mm；For average damping force, N；
Therefore, restore stroke and show that the area that merit curve surrounds is:
It shows the area A that merit curve surrounds in like manner can to seek compression travely, therefore this damper indicator diagram area can represent
For:
A=Al+Ay (25)。
3) indicator card area energy is demarcated；
Having distortion damper indicator diagram as shown in Figure 2, wherein approximate ellipsoidal White curves is for showing merit curve wheel profile, i.e.
Aim curve；Black part is divided into background area.
3.1) damper indicator diagram shown in Fig. 2 being carried out image procossing, its main technological route includes image reading, image
Gray processing and image binaryzation；
Damper indicator diagram is regarded as the two class regions with different grey-scale, utilize aim curve (white) and its background
Difference in gamma characteristic, can define the affiliated area of any pixel point in image by the threshold value chosen, after its binaryzation
Image is as shown in Figure 3.Generally, the input of image procossing and output are image, and picture format is unchanged；And image recognition is not
Being with part, its output is then about picture classification or structural analysis data.
3.1.1) based on Canny edge detection algorithm, aim curve being carried out rim detection, whether detection curve smooths；
Based on Canny edge detection algorithm, aim curve is carried out rim detection, derive Gauss by model letter Method of Seeking Derivative
The first derivative of function is the optimal approximation of Optimal edge detection operator.Canny algorithm can be to aim curve smoothing processing, its
Method is to use Gaussian function:
In formula, σ is that Gaussian filter smoothness controls parameter.
3.1.2) smooth curve uses first order differential operator, it is thus achieved that the gradient magnitude at each pixel and direction；
Show after Ping Hua that the computational methods of the gradient magnitude at the merit each pixel of curve I are to use first order differential operator, so
The gradient magnitude at each pixel and direction can be obtained.Point (i, j) the partial derivative G in 2 directions, placex(i, j) and Gy(i, j) respectively
For:
Gx(i, j)=[I (i, j+1)-I (and i, j)+I (i+1, j+1)-I (i+1, j)]/2 (27)
Gy(i, j)=[I (and i, j)-I (i+1, j)+I (i, j+1)-I (i+1, j+1)]/2 (28)
3.1.3) by refine each pixel gradient magnitude image, can accurately identify and show merit curved edge line, non-
Maximum suppression the most only need to retain the local maximum of amplitude；
By refine each pixel gradient magnitude image, can accurately identify and show merit curved edge line, non-maximum
Suppression the most only need to retain the local maximum of amplitude[5].Canny operator in gradient magnitude image G with point (i, j) centered by 3 ×
Interpolation arithmetic is carried out, if (i, j) (i, j) less than adjacent interpolation, then this pixel for the gradient magnitude G at place for point in the neighborhood of 3
(i, j) is non-edge point, the most then can be considered candidate marginal, thus obtain candidate edge curve image.
3.1.4) use Canny operator to detect from candidate marginal and connect and obtain final edge；
Canny operator employing dual-threshold voltage detects from candidate marginal and connects and obtains final edge.First basis
Feature of image chooses two rational threshold values, wherein sets high threshold as 240, and Low threshold is 120, then at candidate edge curve
In image, to any pixel point, (i j) detects.If (i, j) (i, j) more than selected for gradient magnitude G for detected pixel
High threshold 240, marginal point can be regarded as；If its value contrary is less than Low threshold 120, then determine that it is non-edge point.
If the pixel that gradient magnitude is between high-low threshold value, can first be regarded as doubtful marginal point, then according to the connection at edge
It is judged by property.If there is marginal point in the adjacent pixels of this pixel, then it is assumed that this pixel is also marginal point, otherwise
For non-edge point.
Use Matleb platform program calculation result is tried to achieve in showing merit curved profile and is comprised 142554 pixels, pixel faces
Amass is 257.
3.2) with LabVIEW, damper indicator diagram area mathematical model is programmed, import vibroshock afterwards at automotive suspension
The displacement of 2000 sampled points gathered in vibroshock energy response test system and force value data, just can try to achieve vibroshock institute
The energy absorbed；
Specifically, according to indicator card area micro unit summation, use LabVIEW to program and calculate vibroshock up and down reciprocatingly
The energy summation that one cycle is absorbed.Its flow chart is as shown in Figure 4.
Import the position of 2000 sampled points that vibroshock is gathered in shock absorber of automobile suspension energy response test system
Move and force value data, just can try to achieve the energy that vibroshock is absorbed.It is illustrated in figure 5 vibroshock energy computation results, tests
Being 1406N to its recovery damping force, compression damping power is-942N, uses LabVIEW platform to calculate vibroshock up and down reciprocatingly
The energy summation of periodic attenuation is 69.613J, and therefore the energy represented by unit picture element area is 0.27J.
Said method can be applicable to vibroshock performance evaluation and improves its method of evaluating performance, can be used to judge that vibroshock is abnormal
Become and inspection vibroshock energy absorption capability.The present invention has initially set up shock absorber of automobile suspension and has restored the number with compression travel
Learn model and definition damper indicator diagram area, be then based on Matleb platform and computer image recognition technology is applied to vibration damping
The detection of device indicator card pixel number solves with area；Use LabVIEW platform to calculate subsequently and solve vibroshock at one
Impulse stroke absorbs gross energy, thus quantitative analysis goes out the relation of damper indicator diagram area and absorbed energy, for vibration damping
The performance detection of device provides new evaluation methodology and quantitative criteria.
Claims (3)
1. shock absorber of automobile suspension energy response test system, it is characterised in that include support body, be arranged on support body and just can produce
The crank connecting rod sliding block mechanism of string motion, is used for the fixture (4) of fixed buffer (5) upper lift ring and is used for fixing vibration damping during test
The lower erection support (6) of device (5) lower lift ring, velocity sensor (9), and for measuring the force transducer of damping force；Described song
Handle linkage rod slide block mechanism is used for the stretching realizing vibroshock (5) and moves back and forth with compression travel, has crank (10), crank (10)
One end be fixed on support body, the other end of crank (10) is connected with crankshaft-link rod (8) bottom, and described crankshaft-link rod (8) can
Other end point around crank (10) carries out circumferential movement；The top of crankshaft-link rod (8) is connected with lower erection support (6) thus carries
Dynamic vibroshock (5) moves up and down along with crankshaft-link rod (8), and crankshaft-link rod (8) is additionally provided with matched slide block (7), institute
State slide block (7) to pump under the drive of crankshaft-link rod (8)；Described velocity sensor (9) is arranged on bent axle even
Bar (8) is upper is rotated the speed produced for test by crank (10).
2. shock absorber of automobile suspension energy response test system as claimed in claim 1, it is characterised in that described force transducer
It is fixed on the upper bracket (1) of support body, and connects with fixture (4)；Described force transducer include stain foil force sensor (2) and
Piezoelectric force transducer (3), described stain foil force sensor (2) and piezoelectric force transducer (3) series connection.
3. shock absorber of automobile suspension energy response test system as claimed in claim 1, it is characterised in that also include vibroshock
Side force device, described vibroshock side force device is fixing with vibroshock (5) to be connected, and has side force ring (11), and is packed in frame
Being used on body supports the roller (13) of cable wire (12), and one end of described side force ring (11) is fixedly connected in vibroshock (5)
Between position, the other end of side force ring (11) is connected with cable wire (12), cable wire (12) by roller (13) connect counterweight (14)；Vibration damping
When device moves up and down with following crank connecting rod sliding block mechanism, side force ring (11) drives counterweight (14) with subtracting by cable wire (12)
The device (5) that shakes is made little scope and is moved up and down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620311625.4U CN205607660U (en) | 2016-04-14 | 2016-04-14 | Automotive suspension shock absorber energy characteristics test system |
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| CN201620311625.4U CN205607660U (en) | 2016-04-14 | 2016-04-14 | Automotive suspension shock absorber energy characteristics test system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865811A (en) * | 2016-04-14 | 2016-08-17 | 辽宁工业大学 | Automotive suspension vibration damper energy characteristic testing system and automotive suspension vibration damper energy characteristic metering method |
| CN109060337A (en) * | 2018-08-31 | 2018-12-21 | 朋志鹏 | A kind of automobile strand tooth shock absorber detection device |
| CN114739703A (en) * | 2022-03-10 | 2022-07-12 | 南京依维柯汽车有限公司 | Method for adjusting shock absorber for improving vehicle roll performance and ride comfort |
-
2016
- 2016-04-14 CN CN201620311625.4U patent/CN205607660U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865811A (en) * | 2016-04-14 | 2016-08-17 | 辽宁工业大学 | Automotive suspension vibration damper energy characteristic testing system and automotive suspension vibration damper energy characteristic metering method |
| CN105865811B (en) * | 2016-04-14 | 2018-11-23 | 辽宁工业大学 | Shock absorber of automobile suspension energy response test macro and metering method |
| CN109060337A (en) * | 2018-08-31 | 2018-12-21 | 朋志鹏 | A kind of automobile strand tooth shock absorber detection device |
| CN114739703A (en) * | 2022-03-10 | 2022-07-12 | 南京依维柯汽车有限公司 | Method for adjusting shock absorber for improving vehicle roll performance and ride comfort |
| CN114739703B (en) * | 2022-03-10 | 2024-05-14 | 南京依维柯汽车有限公司 | Shock absorber adjusting method for improving rolling performance and smoothness of vehicle |
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