CN104455157B - Obtaining method of car seat suspension hydraulic buffer nonlinear speed characteristic parameter - Google Patents

Obtaining method of car seat suspension hydraulic buffer nonlinear speed characteristic parameter Download PDF

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Publication number
CN104455157B
CN104455157B CN201410593172.4A CN201410593172A CN104455157B CN 104455157 B CN104455157 B CN 104455157B CN 201410593172 A CN201410593172 A CN 201410593172A CN 104455157 B CN104455157 B CN 104455157B
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seat
hydraulic buffer
vibration
velocity
seat suspension
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CN201410593172.4A
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CN104455157A (en
Inventor
周长城
提艳
于曰伟
潘礼军
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Shandong University of Technology
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Shandong University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • 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
    • G01M17/04—Suspension or damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0041—Locking; Fixing in position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2238/00—Type of springs or dampers
    • F16F2238/04—Damper

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention relates to an obtaining method of a car seat suspension hydraulic buffer nonlinear speed characteristic parameter and belongs to the technical field of car seats. The method is characterized in that according to an established seat human body system vibration simulation model, the vibration acceleration obtained by a test of a seat at a cab floor mounting center position and the vibration acceleration of a seat face, by using a target function obtained though the car seat suspension hydraulic buffer nonlinear speed characteristic parameter and an optimization algorithm, the car seat suspension hydraulic buffer nonlinear speed characteristic parameter is obtained. According to the method, the accurate and reliable seat suspension hydraulic buffer nonlinear speed characteristic parameter can be obtained, the accuracy of car seat human body vibration modeling and analyzing is improved, a reliable technological base is provided for seat suspension system parameter optimization designing, meanwhile, a large amount of money for buffer test table purchasing can be saved, and the shortcomings that buffer test cost is high, and a characteristic parameter obtaining cycle is long are overcome.

Description

Seat suspends the acquisition methods of hydraulic buffer nonlinear velocity characterisitic parameter
Technical field
The present invention relates to seat, particularly seat suspend obtaining for hydraulic buffer nonlinear velocity characterisitic parameter Take method.
Background technology
Hydraulic buffer has preferable nonlinear velocity characteristic, is widely applied in seat suspension system.Seat Chair system comfortableness is one of important indicator of evaluation automotive performance.In order to improve the comfortableness of Seat system for vehicle, it is necessary to build Vertical seat human body vibrating model, so as to be analyzed to seat system and optimization design.Seat human body vibrating model Seat suspension hydraulic buffer nonlinear velocity characteristic accuracy, directly determine seat human body vibrating model Accuracy, so as to the Optimum Design Results and comfortableness that determine seat system improve degree.At present, for hydraulic buffer non-thread Property speed characteristic curve, China is mainly measured by polyaniline, but the method needs special vibroshock Testing stand, for automaker, purchases damper test stand costly；Commission possesses the producer of damper test stand and tries Test, then testing expenses are high, it is longer to obtain the cycle.Therefore, current China automaker grinds in the comfortableness of Seat system for vehicle In studying carefully, to seat suspension hydraulic buffer nonlinear velocity characteristic curve, low expense and fast and accurately acquisition methods are there is no, also Must be set up the acquisition methods that seat suspends hydraulic buffer nonlinear velocity characterisitic parameter.
The content of the invention
For defect present in above-mentioned prior art, technical problem solved by the invention is to provide seat suspension The acquisition methods of hydraulic buffer nonlinear velocity characterisitic parameter.
In order to solve above-mentioned technical problem, seat suspension hydraulic buffer nonlinear velocity provided by the present invention is special Property parameter acquisition methods, its FB(flow block) is as shown in figure 1, comprising the following steps that of implementing of its technical scheme：
(1) vibration test equipment is utilized, measures and collect the seat under certain driving cycle and pacify in cab floor The vertical vibration signal of holding position center and the vertical vibration signal of chair top, gather vibration signal time span for 0, T }={ [0, t1]+[t1, T] }, wherein, previous time period [0, t1] vibration signal be used for seat suspend hydraulic buffer The acquisition of nonlinear velocity characterisitic parameter, latter time period [t1, T] vibration signal can be used for it is outstanding to acquired seat Put the simulating, verifying of hydraulic buffer nonlinear velocity characterisitic parameter；
(2) according to the requirement of seat system Analysis of Comfort, using seat cushion equivalent stiffness KhWith equivalent damping Ch, seat hang Equivalent stiffness K puts, equivalent stiffness K of human bodybWith Equivalent damping coefficient Cb, equivalent mass m of human upperbAnd human buttock Equivalent mass mh, seat and seat cushion quality sum ms, seat suspension hydraulic buffer piston rod centrage and cab floor hang down To angle be vibroshock setting angle θ, build seat human body vertical direction vibration model, wherein, chair top and cab floor it Between vertical damping force Fh=Fcs/ cos θ, and absorber damping force
In formula, damped coefficient Cs, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1And at the beginning of compression travel Secondary Valve opening velocity V1y, used as the amount to be obtained of vibroshock speed characteristics parameter, V is the movement velocity of vibroshock；
(3) according to seat body system vertical direction vibration model, using Matlab/Simulink simulation softwares, seat is set up Body system phantom, with previous time period [0, t1] measured by seat in cab floor installation site center Vertical vibration acceleration signal is input signal, and the vertical vibration root mean square of weighed acceleration of chair top is emulated, its In, weighted value at different frequencies is
(4) with the damped coefficient C in step (2)s, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1, pressure The first Valve opening velocity V of indention journey1y, as the amount to be obtained of vibroshock speed characteristics parameter, using in previous time period [0, t1] Chair top vertical vibration root mean square of weighed acceleration obtained by emulationMeasured chair top is vertical with test shakes Dynamic root mean square of weighed accelerationSet up the target of seat suspension hydraulic buffer nonlinear velocity characterisitic parameter acquisition Function Jmin, i.e.,
(5) object function obtained according to seat suspension hydraulic buffer nonlinear velocity characterisitic parameter, is calculated using optimization Method seeks the minima of parameter acquiring object function, and now, corresponding optimized variable is resulting seat suspension liquid-springing Device nonlinear velocity characteristic curve parameter, i.e. damped coefficient Cs, safety compare ηs, two-way compare βs, restore the first Valve opening velocity of stroke V1, the first Valve opening velocity V of compression travel1y, the absorber damping force F for now obtainingcsThe curve that expression formula is drawn is the car Seat suspension hydraulic buffer nonlinear velocity characteristic curve；
(6) subtracted according to the Vibration Simulation model and resulting seat suspension hydraulic pressure in step (5) of seat body system Shake device nonlinear velocity characteristic curve, with latter time period [t1, T] in measured seat in cab floor installation site The vertical vibration acceleration signal of center carries out emulation meter as input to the vertical vibration weighted acceleration value of chair top Calculate, and be compared with the vertical vibration weighted acceleration value of measured chair top within the time period, obtain to acquired The result of seat suspension hydraulic buffer nonlinear velocity characterisitic parameter verified.
The present invention has the advantage that than prior art：
The present invention can be according to seat body system Vibration Simulation model be set up, and the seat obtained by test is in cab floor The acceleration of vibration of acceleration of vibration and chair top at installation center position, using seat hydraulic buffer non-thread is suspended Property speed characteristic curve parameter acquiring object function and optimized algorithm, acquire seat suspension hydraulic buffer non-thread Property speed characteristics parameter.Using the available more accurately and reliably seat suspension hydraulic buffer nonlinear velocity of the method Characteristic curve, improves the modeling of seat human body vibration and the precision analyzed, and is that the optimization design of seat suspension systematic parameter is established Fixed reliable basis；Meanwhile, the present invention can save the high cost for purchasing damper test stand, it is to avoid commission possesses vibroshock The defect that testing expenses are high, the characterisitic parameter acquisition cycle is longer that the producer of testing stand does experiment and causes.
Description of the drawings
It is described further below in conjunction with the accompanying drawings for a better understanding of the present invention.
Fig. 1 is the acquisition flow chart that seat suspends hydraulic buffer nonlinear velocity characterisitic parameter；
Fig. 2 is vertical vibration acceleration signal of the seat that measures of test in cab floor installation site center；
Fig. 3 is the vertical vibration acceleration signal of the chair top that test is measured；
Fig. 4 is seat human body vertical direction vibration model；
Fig. 5 is the Simulink phantoms of seat human body vibration；
Fig. 6 is the seat suspension hydraulic buffer nonlinear velocity characteristic curve for obtaining.
Specific embodiment
The present invention is described in further detail below by an embodiment.
Certain load-carrying vehicle seat system is needed to meet the requirement of Analysis of Comfort and seat suspension systematic parameter optimization design Seat suspension hydraulic buffer nonlinear velocity characteristic curve is obtained, so as to be optimized design to seat suspension.It is known to be somebody's turn to do In load-carrying vehicle seat system, seat cushion equivalent stiffness Kh=32012N/m and equivalent damping Ch=720Nm/s, seat suspension it is equivalent Stiffness Ks=30100N/m, equivalent stiffness K of human bodyb=27000N/m and Equivalent damping coefficient Cb=800Nm/s, human upper Equivalent mass mb=48kg and equivalent mass m of human buttockh=15kg, seat and seat cushion quality sum ms=20kg, seat Suspension hydraulic buffer piston rod centrage and the vertical angle of cab floor are vibroshock setting angle θ=π/3.The vehicle In highway with 75km/h speed traveling, accelerated by testing vibration of the collected seat in installation floor center The vibration vibration damping acceleration of degree and chair top, using seat human body vibration phantom and parameter acquiring object function, obtaining should Load-carrying vehicle seat suspension hydraulic buffer nonlinear velocity characterisitic parameter.
The seat that the embodiment of the present invention is provided suspends the acquisition side of hydraulic buffer nonlinear velocity characterisitic parameter Method, comprises the following steps that：
(1) vibration test equipment is utilized, measures and collect the vehicle when highway is travelled with 75km/h speed, Seat in the vertical vibration signal of cab floor installation site center and the vertical vibration signal of chair top, respectively such as Fig. 2 With shown in Fig. 3, the time span of test collection signal is 120s, wherein, the vibration signal of previous time period [0,50s] is used to obtain Take the load-carrying vehicle seat suspension hydraulic buffer nonlinear velocity characterisitic parameter, the vibration signal of latter time period [50s, 120s] Can be used for the simulating, verifying to acquired seat suspension hydraulic buffer nonlinear velocity characterisitic parameter；
(2) according to the requirement of seat system Analysis of Comfort, using seat cushion equivalent stiffness Kh=32012N/m and equivalent resistance Buddhist nun Ch=720Nm/s, equivalent stiffness K of seat suspensions=30100N/m, equivalent stiffness K of human bodyb=27000N/m and equivalent Damped coefficient Cb=800Nm/s, equivalent mass m of human upperb=48kg and equivalent mass m of human buttockh=15kg, seat Chair and seat cushion quality sum ms=20kg, seat suspension hydraulic buffer piston rod centrage and the vertical angle of cab floor That is vibroshock setting angle θ=π/3, build seat human body vertical direction vibration model, as shown in figure 4, wherein, chair top and driver's cabin Vertical damping force between floorAnd absorber damping force
In formula, damped coefficient Cs, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1And at the beginning of compression travel Secondary Valve opening velocity V1y, used as the amount to be obtained of vibroshock speed characteristics parameter, V is the movement velocity of vibroshock；
(3) according to seat body system vertical direction vibration model, using Matlab/Simulink simulation softwares, seat is set up Body system phantom, as shown in figure 5, with the seat measured by previous time period [0,50s] in cab floor installation position The vertical vibration acceleration signal for putting center is input signal, and the vertical vibration root mean square of weighed acceleration of chair top is entered Row emulation, wherein, weighted value at different frequencies is
(4) with the damped coefficient C in step (2)s, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1, pressure The first Valve opening velocity V of indention journey1y, as the amount to be obtained of vibroshock speed characteristics parameter, using in previous time period [0,50s] Chair top vertical vibration root mean square of weighed acceleration obtained by emulationMeasured chair top is vertical with test shakes Dynamic root mean square of weighed accelerationSet up seat suspension hydraulic buffer nonlinear velocity characterisitic parameter to obtain The object function J for takingmin, i.e.,
(5) according to the acquisition object function of seat suspension hydraulic buffer nonlinear velocity characterisitic parameter, calculated using optimization Method seeks the minima of parameter acquiring object function, and now, corresponding optimized variable is resulting seat suspension hydraulic pressure and subtracts Shake device nonlinear velocity characterisitic parameter, i.e. damped coefficient Cs=1100, safety compares ηs=1.5, it is two-way to compare βs=1/3, stroke is restored First Valve opening velocity V1The first Valve opening velocity V of=0.3m/s, compression travel1y=-0.2m/s, thus obtained absorber damping force FcsThe curve that expression formula is drawn is the load-carrying vehicle seat suspension hydraulic buffer nonlinear velocity characteristic curve, such as Fig. 6 institutes Show；
(6) according to seat suspension liquid-springing resulting in the Vibration Simulation model and step (5) of seat body system Device nonlinear velocity characteristic curve, with measured seat in latter time period [50s, 120s] in cab floor installation position The vertical vibration acceleration signal of center is put as input, emulation meter is carried out to the vertical vibration weighted acceleration value of chair top Calculate；And be compared with the vertical vibration weighted acceleration value of measured chair top within the time period, wherein, when latter Between the simulation value of seat surface vibration weighted acceleration in section [50s, 120s] be 0.712m/s2, experimental test value is 0.714m/ s2, both deviations are only 0.002m/s2。
Understand, the seat suspension hydraulic buffer nonlinear velocity characteristic curve obtained by obtaining meets seat people Body Model analysis and the requirement of seat suspension systematic parameter optimization design, show that seat suspension hydraulic buffer is non-linear The acquisition methods of speed characteristics parameter are correct.

Claims (1)

1. seat suspends the acquisition methods of hydraulic buffer nonlinear velocity characterisitic parameter, and it is comprised the following steps that：
(1) vibration test equipment is utilized, measures and collect the seat under certain driving cycle in cab floor installation position Put the vertical vibration signal of center and the vertical vibration signal of chair top, the time span for gathering vibration signal be { 0, T }= { [0, t1]+[t1, T] }, wherein, previous time period [0, t1] vibration signal be used for seat suspend hydraulic buffer non-thread The acquisition of property speed characteristics parameter, latter time period [t1, T] vibration signal can be used for acquired seat suspension liquid The simulating, verifying of pressure damper nonlinear velocity characterisitic parameter；
(2) according to the requirement of seat system Analysis of Comfort, using seat cushion equivalent stiffness KhWith equivalent damping Ch, seat suspension Equivalent stiffness Ks, equivalent stiffness K of human bodybWith Equivalent damping coefficient Cb, equivalent mass m of human upperbWith human buttock etc. Effect quality mh, seat and seat cushion quality sum ms, seat suspension hydraulic buffer piston rod centrage and cab floor are vertical Angle is vibroshock setting angle θ, builds seat human body vertical direction vibration model, wherein, between chair top and cab floor Vertical damping force Fh=Fcs/ cos θ, and absorber damping force
F c s = C s &lsqb; V 1 + ( V - V 1 ) 1 &eta; s &rsqb; V &GreaterEqual; V 1 C s V 0 < V < V 1 &beta; s C s V V 1 y < V &le; 0 &beta; s C s &lsqb; V 1 y + 1 &eta; s ( V - V 1 y ) &rsqb; V &le; V 1 y ,
Damped coefficient C in above formulas, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1And compression travel First Valve opening velocity V1y, used as the amount to be obtained of vibroshock speed characteristics parameter, and V is the movement velocity of vibroshock；
(3) according to seat body system vertical direction vibration model, using Matlab/Simulink simulation softwares, seat human body is set up System simulation model, with previous time period [0, t1] measured by seat in the vertical of cab floor installation site center Vibration acceleration signal is input signal, and the vertical vibration root mean square of weighed acceleration of chair top is emulated, wherein, Weighted value under different frequency is
w k ( f i ) = 0.5 f i &Element; &lsqb; 0.5 , 2 &rsqb; H z f i / 4 f i &Element; ( 2 , 4 &rsqb; H z 1 f i &Element; ( 4 , 12.5 &rsqb; H z 12.5 / f i f i &Element; ( 12.5 , 80 &rsqb; H z ;
(4) with the damped coefficient C in step (2)s, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1, compressed line Cheng Chuci Valve opening velocity V1y, as the amount to be obtained of vibroshock speed characteristics parameter, using in previous time period [0, t1] emulation Resulting chair top vertical vibration root mean square of weighed accelerationMeasured chair top vertical vibration adds with test Power acceleration root-mean-square valueSet up the object function of seat suspension hydraulic buffer nonlinear velocity characterisitic parameter acquisition Jmin, i.e.,
J m i n = ( &sigma; z &CenterDot;&CenterDot; s _ s i m - &sigma; z &CenterDot;&CenterDot; s _ t e s t ) 2 ;
(5) object function obtained according to seat suspension hydraulic buffer nonlinear velocity characterisitic parameter, is asked using optimized algorithm The minima of parameter acquiring object function, now, it is non-that corresponding optimized variable is resulting seat suspension hydraulic buffer Linear speed characteristic curve parameter, i.e. damped coefficient Cs, safety compare ηs, two-way compare βs, restore the first Valve opening velocity V of stroke1, pressure The first Valve opening velocity V of indention journey1y, the absorber damping force F for now obtainingcsThe curve that expression formula is drawn is the load-carrying vehicle Seat suspension hydraulic buffer nonlinear velocity characteristic curve；
(6) according to the Vibration Simulation model and resulting seat suspension hydraulic buffer in step (5) of seat body system Nonlinear velocity characteristic curve, with latter time period [t1, T] in measured seat at cab floor installation site center The vertical vibration acceleration signal at place carries out simulation calculation as input to the vertical vibration weighted acceleration value of chair top, and It is compared with the vertical vibration weighted acceleration value of measured chair top within the time period, to the acquired seat for obtaining The result of suspension hydraulic buffer nonlinear velocity characterisitic parameter is verified.
CN201410593172.4A 2014-10-29 2014-10-29 Obtaining method of car seat suspension hydraulic buffer nonlinear speed characteristic parameter Expired - Fee Related CN104455157B (en)

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CN105224718B (en) * 2015-09-06 2018-03-16 山东理工大学 The system of high speed railway car two laterally suspends the Optimization Design of Optimal damping ratio
CN105069261B (en) * 2015-09-06 2017-12-12 山东理工大学 Low speed rail vehicle two is the design method of lateral damper optimum damping coefficient
CN107885924B (en) * 2017-11-01 2021-02-26 泉州装备制造研究所 Performance simulation method of vehicle-mounted hydraulic shock absorber
CN109117557B (en) * 2018-08-14 2023-05-09 重庆理工大学 Suspension rubber bushing optimization method

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CN102904519B (en) * 2012-09-27 2015-04-15 华北电力大学 Robust excitation system parameter identification method based on exponential-type target function
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