APPARATUS AND METHOD TO MEASURE DYNAMIC STIFFNESS AND LOSS FACTOR DISTRIBUTION FOR DYNAMIC COMFORT EVALUATION OF SEAT

Members/or features of the present invention, achieve the appended drawing method and an electronic component connected to the reference surface with specifically carry activitycopyright will in the embodiment. However, in the present invention refers to hereinafter are limited to the disclosure in the embodiment but various different embodied in the form of percussion, in the embodiment of the present invention disclosure is completely only the are and can be utilized, the present invention is provided to a target area of the invention completely for alerting the person with skill in the art in categories to which ball number, defined by category of the present invention refers to claim only disclosed. Throughout the specification the same references refer to the same components.

Hereinafter with reference to the attached drawing in of the present invention in the embodiment detailed the on-sensors other.

Figure 1 shows a sheet of the present invention also one in the embodiment according to dynamic comfort evaluation sheet dynamic stiffness and loss coefficient to account for series front measuring device are disclosed.

The reference also 1, one of the present invention dynamic comfort evaluation sheet dynamic stiffness and loss coefficient distribution measuring device in the embodiment according to sheet (100) is a computer program product (110), rigid substrate (120), plurality of dummy (130) and measuring unit (140) having a predetermined wavelength.

For said computer program product (110) is placed on top sheet (101) for applying vibrations to CLK3 to computer program product. Wherein, for said computer program product (110) drive a vehicle key movement in place said sheet (101) which serves vibration can be.

With reference, to said computer program product (110) includes a mechanical, electric, electrohydraulic a variety of drive transistor can be.

Said rigid substrate (120) to the computer program product (110) and provided on the top of, that are located above the sheet (101) to said computer program product to apply to computer program product (110) may provide a vibrates.

In other words, said rigid substrate (120) to the computer program product (110) and said groove between, for said computer program product (110) may provide a response from the, ringing said sheet (101) is transferred onto the sheet (101) capable of vibration.

With reference to, said rigid substrate (120) according to vibration of said vibration signal is sheet (101) according to vibration of a vibration signal can be used as reference for obtaining a vibration signal.

Said plurality of dummy (130) is said sheet (101) are prevented on top of. The, said plurality of compared to expense (130) is said sheet (101) can be arranged in a pattern of on top of.

Said plurality of dummy (130) has said rigid substrate (120) vibration according to said sheet (101) facing each vibrates. I.e., said plurality of dummy (130) has said rigid substrate (120) the vibration to form said sheet (101) respectively fixed excited to vibrate disclosed.

In the embodiment of the present invention in one said plurality of dummy (130) is said sheet (101) arranged at a since refers to the top of, said plurality of dummy (130) are disposed a standard said sheet (101) can be measure of stiffness and loss coefficient.

Said measuring unit (140) is said rigid substrate (120) according to vibration of reference vibration signal (vibration signal number 1), and said plurality of dummy (130) each vibration according to number 2 vibration signal using said sheet (101) can be measure of stiffness and loss coefficient.

To this end, said measuring section (140) is number 1 sensor (142) and number 2 sensor (144) can be a.

Said number 1 sensor (142) is said rigid substrate (120) is provided to said rigid substrate (120) according to number 1 vibration of a vibration signal by using predetermined material.

The, said number 1 sensor (142) is said rigid substrate (120) can be at least tension, to said computer program product (110) may provide said rigid substrate (120) by vibration generated in accordance with vibration signal, i.e. said number 1 can be a vibration signal.

Said number 1 sensor (142) includes an accelerometer sensor can be implemented. However, said number 1 sensor (142) is not limited, in addition to said accelerometer sensor can be a vibration signal can be implemented in other types of sensors may be filled.

Said number 2 sensor (144) includes said plurality of dummy (130) installed in said plurality of dummy (130) vibration according to number 2 to each vibration signal by using predetermined material.

The, said number 2 sensor (144) is said sheet (101) around the plurality of dummy (130) by each of, said plurality of dummy (130) while vibration each vibration signal, i.e. said number 2 can be a vibration signal.

Said number 2 sensor (144) is said number 1 sensor (142) can be implemented in the same manner as on accelerometer sensor, without limited, in addition to said accelerometer sensor can be a vibration signal can be implemented in other types of sensors may be filled.

Said measuring unit (140) is based on said number 1 and number 2 vibration signal, said sheet (101) of stiffness and loss coefficient by using predetermined material.

I.e., said measuring section (140) is said number 1 and number 2 vibration signal based upon the transfer function (TF) using said sheet (101) can be measure of stiffness and loss coefficient.

To this end, said measuring section (140) is based on said number 1 and number 2 can be a vibration signal deriving said transfer function, said transfer function derived using said sheet (101) rigidity and loss coefficient of said dummy (130) can be a standard measuring each.

Specifically, said measuring section (140) is calculated based upon said number 2 vibration signal autocorrelation function (autocorrelation function) power spectral density (power spectrum density), and a reference vibration signal based on the cross correlation function (the cross-correlation function) said number 1 vibration signal and said number 2 vibration signal are calculated using said transfer function (TF) mutual spectral density (the cross-showing a surface state density) deriving, said transfer function (TF) derived using said sheet (101) can be measure of stiffness and loss coefficient.

Wherein, for said autocorrelation function is calculated by a mathematical equation 1 can be.

[Mathematical equation 1]

Wherein, R_Xx Said number 2 autocorrelation function is a vibration signal, a vibration signal x (t) is said number 2, τ is x (t) spacing between takes time, time T is by a goniophotometer.

Said autocorrelation function expressions that are calculated based on the power spectral densities can be calculated by said marked 2.

[Equations 2]

Wherein, S_Xx Said number 2 autocorrelation function is based on a vibration signal power spectrum density function, R_Xx Said number 2 autocorrelation function is a vibration signal, x (t) spacing between τ is take time, exhibits a frequency ω.

Said cross-correlation function is calculated by a mathematical equation 3 can be represented.

[Equations 3]

Wherein, R_Xf The cross correlation function is said number 1 and number 2 vibration signal, a vibration signal x (t) is said number 1, f (t) is said number 2 vibration signal, f (t) is the distance between τ takes time, time T is by a goniophotometer.

Said expressions that are calculated based on a function cross-correlation calculated by said mutual spectral density 4 can be represented.

[Mathematical equation 4]

Wherein, S_Xf Said number 1 and number 2 is the cross correlation vibration signal based on a function mutual spectral density function, R_Xf Said number 1 and number 2 vibration signal is the cross correlation function, f (t) is the distance between τ takes time, exhibits a frequency ω.

In this way, said expressions 1 to 4 by using a transfer function (TF) is said expressions based on expressions can be representation such as 5.

[Mathematical equation 5]

I.e., said transfer function (TF) is calculated based upon said mutual spectral density function and said power spectrum density function can be.

Said measuring section (140) through said sheet from said transfer function (TF) is calculated complex stiffness (101) can be measure of stiffness and loss coefficient. Wherein, said complex the rigidity is corresponding to the real parts and rigid, an imaginary part of the loss coefficient can be made.

The, said measuring section (140) is a value corresponding parameters of real portions of said complex rigid dummy (130) corresponding to position for the sheet (101) reinforcing member is measured as, said complex rigid the imaginary parts a value corresponding dummy (130) corresponding to position for the sheet (101) can be measured as a loss coefficient for.

On the other hand, said measuring section (140) includes said plurality of dummy (130) rigidity and loss coefficient curve fitting (curve fitting) measured at each of the sheet (101) can be measuring distribution and the stiffness of the loss coefficient distribution. Said curve fitting generally relates to a support are the corresponding numerical analysis, the same description is given in the embodiment is dispensed the on-sensors other.

In hereinafter by curve fitting said said sheet (101) to the stiffness of the loss coefficient distribution measurement reference 3a 3c also distribution and also through a browser substrate.

First, the reference 3a also and also 1, said measuring section (140) includes said plurality of dummy (130) rigidity and a loss coefficient of the transfer function of a value measured at said curve fitting can be used for the second time.

E.g., said sheet (101) arranged above the dummy (130) among the number of 15, 1 to about 15 in number is given to each assumed to have occurred. In this case, said measuring section (140) is 3, 6, 9, 12, 15 times dummy (130) each value measured at each transfer function can be represented using curve fitting.

The, said measuring section (140) is the transfer function of each said through curve fitting said can exhibit in the frequency domain value. In other words, measuring section (140) is each dummy (130) can be represented by a transfer function magnitude values measured at each frequency-classified values.

Thus, in the embodiment of the present invention the one, said plurality of dummy (130) are disposed each positions of the transfer function of a size can be found in a frequency region.

Next, 1 also, and also the reference also 3b 3c, said measuring section (140) is curve fitting delivery from said function, said plurality of dummy (130) corresponding to each distribution and acquires the distribution loss coefficient can be rigid.

The, said measuring section (140) also includes a plurality of dummy said 3b as shown in (130) corresponding to each rigid distribution which can exhibit in the frequency domain, as shown in also 3c said plurality of dummy (130) corresponding to each loss coefficient distribution in the frequency domain can exhibit.

Thus, in the embodiment of the present invention the one, said plurality of dummy (130) are disposed each positions of loss coefficient distribution can be rigid distribution and identifying, through said plurality of dummy (130) can be different than that of the size of each transfer function. In other words, said sheet (101) arranged on top of said plurality of dummy (130) rigid and measured for each of the loss coefficient can be different.

On the other hand, said measuring section (140) having different characteristics are selected from each sheet (101) analyzing said measured according rigid distribution and a loss coefficient of distribution, said each sheet (101) including a loss coefficient of each said distribution and said average value to produce the index for each distribution can be rigid.

Hereinafter in said each sheet (101) 4a and 4b also against a loss coefficient index distributions by rigid distribution and also through a browser substrate.

Also 1, 4a and 4b may also reference the, said measuring section (140) is said each sheet (101) rigid distribution by analyzing, its analysis based on the result of said each sheet (101) including rigid distribution can be to produce the index by the average value of (4a also). In addition, said measuring section (140) is said each sheet (101) by analyzing a loss coefficient of distribution, its analysis based on the result of said each sheet (101) including a loss coefficient to produce the index by the average value of distribution can be.

Wherein, for each said distribution and said index further comprises said loss coefficient distribution standard deviation can be rigid. To this end, said measuring section (140) is a loss coefficient of said rigid distribution and said maximum and minimum values based on said standard deviation to produce the index for each distribution can be further including said.

Said measuring unit (140) is said calculated index, said sheet (101) characteristics are compared with one another, can be analyzing. Thus, in the embodiment of the present invention according to one, said sheet (101) distribution and the distribution characteristics of said sheet by a loss coefficient of rigid replace by extracting index by analyzing, sheet (101) each element of (stiffness and loss coefficient) is said sheet (101) can be objectively influence of vibration characteristic of information.

Said measuring unit (140) is said calculated for using the index to said sheet (101) dynamic characteristic of the regression type are derived, said regression type derived using said sheet (101) to prevent damage can be subjectively evaluating predict a result of comfort.

Hereinafter derived regression formula with comfort in said sheet to prevent damage of a main evaluation result of predictions also 5 through a browser substrate.

The reference also 1 and also 5, said measuring section (140) isSaid main to predict the result, said sheet (101) using data (red) average loss coefficient distribution and stiffness of each distribution being carried out, and said sheet (101) to said distribution and a loss coefficient of stiffness of the loss coefficient distribution each average corresponds to a quarter of data (green) as well as a standard deviation.

As a result, said measuring section (140) is said to predict regression type elicited to the main evaluation result, rigid distribution and said loss coefficient distribution each average corresponds is applied, said sheet (101) were subjectively evaluating each can predict a result. Furthermore, said measuring section (140) is a loss coefficient of said distribution and distribution each average corresponds in addition to rigid, until said standard deviation when a loss coefficient, more precisely said sheet (101) can predict a result by evaluating the main queue.

Thus, according to one embodiment of the present invention, said sheet (101) and dynamic properties of the objectively measuring, and said sheet (101) dynamic comfort evaluation (subjective evaluation) by comparison, said sheet (101) for improving comfort improvement be fusion point corresponding to a number of direction.

Also in the embodiment according to Figure 2 shows a sheet of the present invention dynamic comfort evaluation sheet dynamic stiffness and other loss coefficient to account for series surface measuring device are disclosed.

As shown in fig. 2, in the embodiment according to comfort evaluation sheet dynamic stiffness and loss coefficient of distribution of the present invention dynamic of other device (200) is acquisition section (210), comparing section (220) and measuring unit (230) having a predetermined wavelength.

Said acquisition section (210) includes a sheet (reference of Figure 1 "101") arranged on top of the plurality of dummy (reference "130" of Figure 1) rigid experimental measurements for each complex obtain other.

To this end, said acquisition section (210) includes a plurality of dummy each vibration according to number 2 said vibration signal based on the power spectral densities are calculated autocorrelation function, and high precision reference vibration signal applied to said sheet through the cross correlation function calculated based upon said number 2 number 1 vibration signal and a vibration signal experiment using said transfer function or other spectral density drawn through the complex rigid experiment measurements can be obtain.

Wherein, said experiments used for obtaining measurements and said autocorrelation function based on said correlation function and said autocorrelation function are calculated power spectral density and said cross correlation function in the embodiment of the present invention calculated based upon interaction with the spectrum density and therefore similar to measuring section calculated by one way or, in the embodiment of the present invention and description is given in other dispensed the on-sensors other.

Said acquisition section (210) includes a plurality of dummy for each said theoretical modeling can be one theoretical delivery function is obtained.

The, said acquisition section (210) has a spring modeling said sheet, said sheet and said mass - spring system (mass spectrometry provided through a second flow passage system) by a plurality of dummy interprets, said theoretical transfer function can be obtain.

Wherein, said plurality of dummy said spring corresponding to the position and number of modeling can be.

I.e., said acquisition section (210) includes a plurality of dummy by said mass (m_n ) And, by vibration frequency (ω) according to said plurality of dummy prismatic taken into account, for each plurality of dummy said theoretical transfer function (TF_n ) Can be obtain.

Expressions can be derived by theoretical transfer function is said to 6.

[Mathematical equation 6]

Wherein, N vibration signal generated from the second dummy (model), The rigid substrate (model) generated from a vibration signal, N is a part of the second dummy (model) which supports a complex rigid, m_n The mass flow rate of the second dummy (model) n, ω is 2 Πf, f is frequency exhibits.

The, said Is a mathematical equation can be derived by 7.

[Mathematical equation 7]

Wherein, k is sheet stiffness and, exhibit a loss coefficient η is sheet, i exhibits is imaginary.

Said comparing section (220) is complex rigid experiment measurements each said real and imaginary a, the transfer function of said real and imaginary and compares theory.

I.e., said comparing section (220) includes a plurality of dummy according to said, said experimental measurements of real portions of the theoretical transfer function by comparing the real parts and the proportion to induce said rigidity the relation number 1, said imaginary part of said imaginary part of said transfer function by comparing the theoretical and experimental measurements to f number 2 can be inducing a loss coefficient of stiffness and the relational expression.

Said comparing section (220) is said number 1 and number 2 on the basis of said variables can be the simultaneous equations derive from each solution. I.e., said comparing section (220) includes a first rigid value is determined from said number 1 of the relational expressions variable relation said number 1, said rigid value calculated by substituting said number 2 computes the remainder of variable value of said number 2 loss coefficient can be obtained therefrom.

Said measuring section (230) is derived according to said each of said plurality of dummy said variable rigidity and loss coefficient can be measured as a solution.

Said measuring section (230) is measured at each of said plurality of dummy rigidity and loss coefficient by curve-fitting, said distribution and a loss coefficient of distribution can be measuring the stiffness of the sheet.

By curve fitting said distribution and said rigid sheet loss coefficient distribution measurement, in the embodiment of the present invention in measuring one or similar and therefore, in the embodiment of the present invention and description is given in other dispensed the on-sensors other.

Said measuring section (230) is different according to each sheet has a cone-shaped rigid distribution and said analyzing said measured loss coefficient distribution, including distribution and a loss coefficient of said each sheet according to said average value to produce the index for said each distribution can be rigid.

The, said measuring section (230) is a loss coefficient of each said rigid distribution and minimum and maximum values based on said distribution, said distribution and said rigid standard deviation can be calculated as indicia said further loss coefficient of each distribution.

I.e., said measuring section (230) is a loss coefficient of said each sheet according to said distribution each average corresponds and standard deviation to produce the index including said rigid distribution and can be.

Said measuring section (230) is calculated for using the index to said dynamic characteristic of said sheet and the fatigue regression, using said sheet to prevent damage of a regression type derived said comfort can be subjectively evaluating predict a result.

Said measuring section (230) is other can function, these functions include measuring section of Figure 1 (140) and therefore the functioning of similar or, in the embodiment of the present invention and description is given in other dispensed the on-sensors other.

Figure 6 shows a sheet of the present invention also one in the embodiment according to dynamic comfort evaluation sheet shown to flow loss coefficient distribution measuring method and dynamic stiffness to explain are disclosed.

The reference 2 also and also 6, step (610) of dynamic stiffness and loss coefficient in said measuring device (200) is arranged at the upper portion of said plurality of dummy (130) complex rigid experiment measurements for each obtain other.

The, loss coefficient of dynamic stiffness and said measuring device (200) includes a plurality of dummy said mass - spring system is obtained from the theoretical delivery to said sheet and said disapproval function is obtained.

Next, step (620) in loss coefficient of dynamic stiffness and said measuring device (200) is a complex said real and imaginary each rigid experiment measurements, said plurality of dummy (130) for each transfer function of one theory compares real and imaginary and theoretical modeling.

I.e., a loss coefficient of dynamic stiffness and said measuring device (200) includes said plurality of dummy (130) each, said experimental measurements and said transfer function on the basis of theory of real portions of the and the imaginary parts respectively comparing the simultaneous equations can be derived solution.

Next, step (630) of dynamic stiffness and loss coefficient in said measuring device (200) is based on the result of said comparison, said sheet stiffness and loss coefficient by using predetermined material.

The, loss coefficient of dynamic stiffness and said measuring device (200) and holds sheet stiffness and loss coefficient curve fitting on the coating layer, the stiffness of the sheet can be measuring distribution and a loss coefficient of distribution.

Through, said sheet dynamic stiffness and loss coefficient distribution measurement device (200) is a loss coefficient of distribution of said sheet to prevent rigid distribution and utilizing said comfort can be subjectively evaluating predict a result.

Hitherto the present invention according to specific function of but in the embodiment, as well as out of the way of the present invention does not limit within several modified vertical transfer are disclosed. Thus, in the embodiment of the present invention don't described range and does not require any limited, as well as carry on patent the following is claimed is defined by others should evenly patent the following is claimed.

Although the present invention refers to than in the embodiment described by the defined on the drawing but, in the embodiment of the present invention refers to said limited to has the, this person with skill in the art various modifications and deformable from the substrate in the present invention if the flawless 2000. Thus, the present invention must be grasped only by the claim idea is described below, the present invention is equalized or on an equivalent modification will that both belonging to the category of event.