CN104156549B - The seat cushion equivalent stiffness of seat model of vibration and the discrimination method of equivalent damping - Google Patents
The seat cushion equivalent stiffness of seat model of vibration and the discrimination method of equivalent damping Download PDFInfo
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- CN104156549B CN104156549B CN201410446106.4A CN201410446106A CN104156549B CN 104156549 B CN104156549 B CN 104156549B CN 201410446106 A CN201410446106 A CN 201410446106A CN 104156549 B CN104156549 B CN 104156549B
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Abstract
The present invention relates to the seat cushion equivalent stiffness of seat model of vibration and the discrimination methods of equivalent damping, belong to vehicle seating art field.Fitting function method of the prior art is excessively complicated, and needs to be fitted and change repeatedly, and those skilled in the art are difficult to grasp and use.The present invention is characterized in that：According to the Matlab/simulink Vibration Simulation models of the seat cushion body system established, and at the measured seat installation floor position of experiment and the vibration acceleration of chair top, using the identification object function and optimization algorithm of equivalent stiffness and equivalent damping parameter, seat cushion equivalent stiffness and equivalent damping are recognized.More accurately and reliably seat cushion equivalent stiffness and equivalent damping can be recognized to obtain using this method, the optimization design for seat suspension systematic parameter establishes reliable basis；Meanwhile the present invention can avoid carrying out a large amount of sampling test, reduce testing expenses, shorten design and the development cycle of seat suspension system.
Description
Technical field
The present invention relates to seats, particularly the seat cushion equivalent stiffness of seat model of vibration and distinguishing for equivalent damping
Knowledge method.
Background technology
Seat system comfort is one of important indicator for evaluating automotive performance.In order to improve the comfortable of motor-vehicle seat system
Property, it is necessary to seat human body vibrating model is established, so as to be analyzed seat system and optimization design.Seat human body
The seat cushion equivalent stiffness of model of vibration and the accuracy of damping directly determine the accuracy of seat human body vibrating model, so as to
The Optimum Design Results and comfort for determining seat system improve degree.At present, China is in the comfortable Journal of Sex Research of motor-vehicle seat system
In, usually ignore rigidity and the damping of seat cushion, cause established seat human body vibrating model inaccurate.Many scholar's roots
According to the test data that a large amount of seat cushions are tested, equivalent stiffness and the damping of seat cushion, this method testing expenses are obtained by curve matching
Height, period are long.For example, it is published in《Engineering mechanics》Paper on periodical《Automotive seat foam of polymers seat cushion nonlinear elasticity-
Damping characteristic Modeling Research》, the acquisition methods of a kind of seat cushion rigidity and damping parameter are disclosed, method is by a large amount of seat
Chair dynamic test then using curve-fitting method, obtains seat cushion rigidity and damping parameter.This method is disadvantageous in that, is needed
A large amount of seat dynamic tests are done, therefore testing expenses are high, the parameter acquiring period is long.Although the in addition, parameter that this method obtains
Precision meets requirement, but the fitting function of seat cushion rigidity and damping characteristic parameter it is excessively complicated and need to be fitted repeatedly and
Modification is not easy to the quick of technical staff and grasps and use.Therefore, it is equivalent to the seat cushion of seat human body vibrating model at present
Rigidity and equivalent damping, China there is no fast and accurately acquisition methods, it is necessary to establish the seat cushion of seat model of vibration
The discrimination method of equivalent stiffness and equivalent damping.
Invention content
Defect present in for the above-mentioned prior art, technical problem solved by the invention are to provide seat vibration
The seat cushion equivalent stiffness of model and the discrimination method of equivalent damping.
In order to solve the above-mentioned technical problem, it the seat cushion equivalent stiffness of seat model of vibration provided by the present invention and waits
The discrimination method of damping is imitated, flow diagram is as shown in Figure 1, the implementation of its technical solution is as follows：
(1) it using vibration test equipment, measures and collects the seat under certain driving cycle and pacify in cab floor
The vertical vibration signal of vertical vibration signal and chair top at holding position center, acquire the time span of vibration signal for 0,
T }={ [0, t1]+[t1, T] }, wherein, previous time period [0, t1] vibration signal be used for seat cushion equivalent stiffness and equivalent damping
Identification, latter time period [t1, T] vibration signal can be used for the emulation of seat cushion equivalent stiffness and equivalent damping identification result is tested
Card；
(2) according to the requirement of seat system Analysis of Comfort, the equivalent stiffness K of seat suspension is utilizedsWith equivalent damping system
Number Cs, the equivalent stiffness K of human bodybWith Equivalent damping coefficient Cb, the equivalent mass m of human upperbWith the equivalent mass of human buttock
mhAnd seat and seat cushion quality sum ms, build seat human body vertical direction vibration model；
(3) according to seat body system's vertical direction vibration model, using Matlab/Simulink simulation softwares, seat is established
Body system's simulation model, in previous time period [0, t1] measured by seat at 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,
In, weighted value at different frequencies is
(4) with seat cushion equivalent stiffness KhWith equivalent damping ChVariable is recognized as an optimization, using in previous time period [0, t1]
Emulate obtained chair top vertical vibration root mean square of weighed accelerationMeasured chair top is vertical with experiment shakes
Dynamic root mean square of weighed accelerationEstablish the object function J of seat cushion equivalent stiffness and equivalent damping parameter identificationmin, i.e.,
(5) according to the identification object function of seat cushion equivalent stiffness and equivalent damping parameter, parameter is asked to distinguish using optimization algorithm
The minimum value of object function is known, at this point, corresponding optimized variable is to recognize obtained seat human body vibrating model
Seat cushion equivalent stiffness and equivalent damping, i.e. seat cushion equivalent stiffness KhWith equivalent damping Ch；
(6) according to the Vibration Simulation model of seat body system and the obtained seat cushion equivalent stiffness of identification and equivalent resistance
Buddhist nun, in latter time period [t1, T] in the vertical vibration of measured seat at cab floor installation site center accelerate
Spend signal as input, carry out simulation calculation to the vertical vibration weighted acceleration value of chair top, and with the institute within the period
The vertical vibration weighted acceleration value of the chair top measured is compared, to the identification result of seat cushion equivalent stiffness and equivalent damping
It is verified.
The present invention has the advantage that than the prior art：
Fitting function method of the prior art is excessively complicated, and needs to be fitted and change repeatedly, and technical staff is difficult to slap
It holds and uses.The present invention can be according to establishing seat body system's Vibration Simulation model and the measured seat of experiment in driver's cabin
The vibration acceleration of vibration acceleration and chair top at the installation center position of floor, utilizes seat cushion equivalent stiffness and equivalent damping
The identification object function and optimization algorithm of parameter, quick obtaining seat cushion equivalent stiffness and equivalent damping；It can be recognized using this method
More accurately and reliably seat cushion equivalent stiffness and equivalent damping are obtained, improves the essence of the modeling of seat human body vibration and analysis
Degree, the optimization design for seat suspension systematic parameter establish reliable basis；Meanwhile the present invention can avoid carrying out a large amount of sample
Experiment reduces testing expenses, shortens design and the development cycle of seat suspension system.
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 seat cushion equivalent stiffness of seat human body vibrating model and the identification flow chart of equivalent damping；
Fig. 2 is the vertical vibration acceleration signal for testing the seat measured at cab floor installation site center；
Fig. 3 is the vertical vibration acceleration signal of chair top that experiment measures；
Fig. 4 is seat human body vertical direction vibration model；
Fig. 5 is the Simulink simulation models of seat human body vibration.
Specific embodiment
The present invention is described in further detail below by an embodiment.
Certain load-carrying vehicle seat system needs to meet the requirement of Analysis of Comfort and seat suspension systematic parameter optimization design
The seat cushion equivalent stiffness and equivalent damping of seat human body vibrating model are obtained, so as to be optimized to seat suspension.
Know in the load-carrying vehicle seat system, the equivalent stiffness K of seat suspensions=30000N/m and Equivalent damping coefficient Cs=1000Nm/s,
The equivalent stiffness K of human bodyb=27000N/m and Equivalent damping coefficient Cb=800Nm/s, the equivalent mass m of human upperb=48kg
With the equivalent mass m of human buttockh=15, seat and seat cushion quality sum ms=20kg.The vehicle is in highway with 75km/h
Speed travels, and is subtracted by the vibration for testing vibration acceleration and chair top of the collected seat at installation floor center
Shake acceleration, using seat human body vibration simulation model and parameter identification object function, to the loading vehicle seats human body vibration mould
The seat cushion equivalent stiffness and equivalent damping of type are recognized.
The seat cushion equivalent stiffness of seat model of vibration and the identification side of equivalent damping that the embodiment of the present invention is provided
Method is as follows：
(1) using vibration test equipment, measure and collect the vehicle highway with 75km/h speed when driving,
The vertical vibration signal of vertical vibration signal and chair top of the seat at cab floor installation site center, respectively such as Fig. 2
Shown in Fig. 3, the time span of test acquisition signal is 120s, wherein, the vibration signal of previous time period [0,50s] is used for seat
Equivalent stiffness and equivalent damping identification are padded, the vibration signal of latter time period [50,120] can be used for equivalent stiffness and equivalent resistance
The simulating, verifying of Buddhist nun's identification result；
(2) according to the requirement of seat system Analysis of Comfort, the equivalent stiffness K of seat suspension is utilizeds=30000N/m and
Equivalent damping coefficient Cs=1000Nm/s, the equivalent stiffness K of human bodyb=27000N/m and Equivalent damping coefficient Cb=800Nm/s,
The equivalent mass m of human upperb=the 48kg and equivalent mass m of human buttockh=15kg and seat and seat cushion quality sum ms
=20kg builds seat human body vertical direction vibration model, as shown in Figure 4；
(3) according to seat body system's vertical direction vibration model, using Matlab/Simulink simulation softwares, seat is established
Body system's simulation model, as shown in figure 5, with the seat measured by previous time period [0,50s] in cab floor installation position
Vertical vibration acceleration signal at center is put as input signal, to the vertical vibration root mean square of weighed acceleration of chair top into
Row emulation, wherein, weighted value at different frequencies is
(4) with seat cushion equivalent stiffness KhWith equivalent damping ChRecognize variable as an optimization, using previous time period [0,
50s] the obtained chair top vertical vibration root mean square of weighed acceleration of emulationChair top with testing measured hangs down
To vibration root mean square of weighed accelerationEstablish the mesh of seat cushion equivalent stiffness and equivalent damping parameter identification
Scalar functions Jmin, i.e.,
(5) according to the identification object function of seat cushion equivalent stiffness and equivalent damping parameter, parameter is asked to distinguish using optimization algorithm
The minimum value of object function is known, at this point, corresponding optimized variable is to recognize obtained seat human body vibrating model
Seat cushion equivalent stiffness and equivalent damping, i.e. seat cushion equivalent stiffness Kh=30012N/m and equivalent damping Ch=520Nm/s；
(6) according to the Vibration Simulation model of seat body system and the obtained seat cushion equivalent stiffness of identification and equivalent damping,
Accelerated with vertical vibration of the measured seat in latter time period [50,120s] at cab floor installation site center
Signal is spent as input, and simulation calculation is carried out to the vertical vibration weighted acceleration value of chair top；And with the institute within the period
The vertical vibration weighted acceleration value of the chair top measured is compared, wherein, the seat in latter time period [50,120s]
The simulation value of surface vibration weighted acceleration is 0.71m/s2, experimental test value is 0.715m/s2, the two deviation is only 0.005m/
s2。
It is found that seat cushion equivalent stiffness and equivalent damping meet the analysis of seat manikin and seat obtained by identification
The requirement of suspension system Parameters Optimal Design shows the seat cushion equivalent stiffness of the seat model of vibration and distinguishing for equivalent damping
Knowledge method is correct.
Claims (1)
1. the seat cushion equivalent stiffness of seat model of vibration and the discrimination method of equivalent damping, are as follows：
(1) it using vibration test equipment, measures and collects the seat under certain driving cycle in cab floor installation position
Put the vertical vibration signal of the vertical vibration signal and chair top at center, acquire the time span of vibration signal for { 0, T }=
{ [0, t1]+[t1, T] }, wherein, previous time period [0, t1] vibration signal recognized for seat cushion equivalent stiffness and equivalent damping,
Latter time period [t1, T] vibration signal can be used for the simulating, verifying of seat cushion equivalent stiffness and equivalent damping identification result；
(2) according to the requirement of seat system Analysis of Comfort, the equivalent stiffness K of seat suspension is utilizedsWith Equivalent damping coefficient Cs,
The equivalent stiffness K of human bodybWith Equivalent damping coefficient Cb, the equivalent mass m of human upperbWith the equivalent mass m of human buttockhAnd
Seat and seat cushion quality sum ms, build seat human body vertical direction vibration model；
(3) according to seat body system's vertical direction vibration model, using Matlab/Simulink simulation softwares, seat human body is established
System simulation model, in previous time period [0, t1] measured by seat it is vertical at 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
(4) with seat cushion equivalent stiffness KhWith equivalent damping ChVariable is recognized as an optimization, using in previous time period [0, t1] emulation
Obtained chair top vertical vibration root mean square of weighed accelerationChair top vertical vibration with testing measured adds
Weigh acceleration root-mean-square valueEstablish the object function J of seat cushion equivalent stiffness and equivalent damping parameter identificationmin, i.e.,
(5) according to the identification object function of seat cushion equivalent stiffness and equivalent damping parameter, parameter identification mesh is sought using optimization algorithm
The minimum value of scalar functions, at this point, corresponding optimized variable is the seat cushion for recognizing obtained seat human body vibrating model
Equivalent stiffness and equivalent damping, i.e. seat cushion equivalent stiffness KhWith equivalent damping Ch；
(6) according to the Vibration Simulation model of seat body system and the obtained seat cushion equivalent stiffness of identification and equivalent damping, with
In latter time period [t1, T] in the vertical vibration acceleration letter of measured seat at cab floor installation site center
Number as input, carry out simulation calculation to the vertical vibration weighted acceleration value of chair top, and with it is measured within the period
The vertical vibration weighted acceleration value of chair top be compared, the identification result of seat cushion equivalent stiffness and equivalent damping is carried out
Verification.
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| CN105117556B (en) * | 2015-09-06 | 2018-06-29 | 山东理工大学 | One system of high ferro and the cooperative optimization method of two systems and end shock absorber damping |
| CN105138786B (en) * | 2015-09-06 | 2018-06-22 | 山东理工大学 | Two system of high ferro and the cooperative optimization method of body end portion lateral damper damped coefficient |
| CN105302944B (en) * | 2015-10-08 | 2018-02-13 | 山东理工大学 | The computational methods of the passive suspension optimum damping ratio of vehicle based on generalized dissipation energy |
| CN109916583B (en) * | 2019-04-04 | 2021-06-08 | 大连交通大学 | Equivalent verification method for axial rigidity of toothed lock washer |
| CN116522581B (en) * | 2023-03-01 | 2024-04-26 | 中国民航大学 | Structure optimization design method and system for passenger seat |
| CN117445780B (en) * | 2023-12-26 | 2024-02-23 | 常熟理工学院 | Intelligent control method for variable-rigidity variable-damping automobile seat |
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| Modelling the fore-and-aft apparent mass of the human body and the transmissibility of seat backrests;Yi Qiu，Michael J. Griffin;《Vehicle System Dynamics》;20110531;第49卷(第5期);全文 * |
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