CN110411755A - A kind of objective quantification method of pair of gas braking light truck vibration subjective assessment - Google Patents
A kind of objective quantification method of pair of gas braking light truck vibration subjective assessment Download PDFInfo
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Abstract
The invention proposes a kind of objective quantification methods to gas braking light truck idle vibration subjective assessment, the processing method of acquisition, subjective and objective data including sample car vibration signal passes through the correlation analysis to subjective evaluation result and objective data, the foundation that correlation model is carried out using Spearman's correlation coefficient obtains the objective quantification mathematical model that the subjective assessment of light truck idle vibration is braked to gas.The subjective assessment situation that gas brakes light truck idle vibration is obtained by this method, is comprehensive, effective test and evaluation method.The test method of this method application is simple, and thinking is clear, has very strong versatility, can adapt to the test and assessment of a variety of models idle vibration performance.
Description
Technical field
The present invention relates to a kind of quantization methods, subjective to gas braking light truck idle vibration more particularly, to one kind
The objective quantification method of evaluation, belongs to light truck technical field.
Background technique
Auto industry is the pillar industry in China, and wherein light truck occupies sizable specific gravity.Light duty vapour
The development of vehicle also plays critically important effect in the automotive industry, and even more playing in the basic activities such as the energy, traffic can not
The effect of substitution.Currently, the brake system of light truck generally uses gas mode of braking, and compared with liquid braking, gas braking
System brake is swift in response, braking strength is big, but structure is complicated, need inflating pump, drier, gas receiver, dual pressure controller, after
The components such as dynamic valve, are easier to break down.Due to the presence of vehicle pump gas system, compared with liquid Brake Products, gas Brake Products NVH
Performance is relatively poor, especially idling when engine fundamental frequency it is close with inflating pump working frequency, be easy to happen low-frequency resonance.
This also proposes higher NVH performance requirement to gas braking light truck manufacturer.However, human body is to automobile vibration
Subjective feeling be it is extremely complex, resonant frequency is usually 8-10Hz, this low-frequency jitter with acceleration characterize is difficult to comment with subjectivity
Valence result is corresponding, and the idle vibration superiority and inferiority of a light truck must not be by simple acceleration root-mean-square value as base
This evaluation index.During vehicle NVH performance development, how correctly to assess interior vibration is always a problem.
Since the subjective feeling of people is more complicated, subjective and objective result will occur not when evaluating interior idle vibration performance
The idle vibration acceleration root-mean-square value that consistent phenomenon, especially gas brake light truck is not high, but due to frequency
Ingredient is lower, and the subjective feeling of people is excessively poor, therefore the objective results of gas braking light truck idle vibration cannot characterize
Its Vibration Condition.Therefore, it is necessary to design a kind of objective quantification to gas braking light truck idle vibration subjective assessment
Method efficiently solves the inconsistent problem of subjective evaluation.
Summary of the invention
It is an object of the invention to: in view of the defects existing in the prior art, propose a kind of to gas braking light truck
The objective quantification method of idle vibration subjective assessment solves the car that gas braking light truck encounters in R&D process
Vibrate the inconsistent problem of subjective evaluation.
The present invention provides a kind of objective quantification method to gas braking light truck idle vibration subjective assessment, packets
Include following method and step:
Step 1, gas braking light truck vehicle is in idling under light condition and rests in flat place；
Step 2, acceleration transducer (1) is arranged at operator's seat seat rail, affixes to the guide rail X close to body side
Direction intermediate point, the acceleration transducer have the effective metering quality certification by calibration and calibration；
Step 3, acceleration transducer is connect with data acquisition device, and it is 512Hz that sample frequency, which is arranged,；
Step 4, start vehicle, so that vehicle is in idling operation, and close all attachmentes, after vehicle-state is stablized, adopt
Collect valid data, every group of signal acquisition 10s, each car acquires 3 groups of useful signals, acquires m vehicle gas altogether and brakes light duty vapour
Vehicle idle vibration time-domain signal；
Step 5, using signal processing software to each gas of acquisition brake light truck idle vibration time-domain signal into
The calculating of row objective parameter；
Step 6, subjective assessment personnel are selected, the number of the subjective assessment personnel is at least 20 people, and covers different
Height, weight, gender, age bracket, driving age and whether be automobile major relevant staff；
Step 7, subjective assessment is carried out using Paired Comparisons, m sample car is passed through into permutation and combination, compares two-by-two, obtains
The evaluations matrix of one m*m, is denoted as Q；On the basis of not influencing evaluation test validity, to reduce workload, using half square
Battle array evaluation；If i and j respectively represent 2 vehicle samples；If it is considered to i is better than j, qij=1 is remembered；If i is suitable with j, qij is remembered
=0；If i ratio j is poor, qij=-1 is remembered；Ideally, matrix Q should be an antisymmetric matrix；
Step 8, sample car under an objective data is obtained by objectively evaluating system to sort, by subjective assessment system,
Obtain sequence of each respondent to sample car；Since data are all sort types, Spearman rank correlation system is utilized
It is several that it is handled, abbreviation coefficient of rank correlation.
Further, in the step 1, place to be measured is open, the flat place being made of stiff materials, described
Stiff materials are at least concrete, pitch or cement.
Further, in the step 4, the value of m is between 6~12.
Further, in the step 5, vibration data uses steady state time mode, per second 5000 times average, linear flat
, it is overlapped 50%, calculates the root-mean-square value in 0~200Hz frequency range, it is square to calculate extensional vibration acceleration by resolution ratio 0.1Hz
Root axw, lateral vibration acceleration root-mean-square value ayw and Vertical Acceleration root-mean-square value azw calculate idling using following formula
Pilot set combines acceleration root-mean-square value under operating condition:
Wherein 1.4 be acceleration weighting coefficient.
Further, in the step 6, the male to female ratio of subjective assessment personnel selection 4:1, wherein height 175cm with
On subjective assessment personnel be no less than 20%, the subjective assessment personnel of weight 80kg or more are no less than 20%, and 40 one full year of life are below
Subjective assessment personnel account for 70% or more, and the evaluation personnel of no less than 3 year driving age accounts for 80% or more, and automobile major especially NVH is special
The relevant subjective assessment personnel of industry must not be higher than 20%.
Further, the step 7 the specific steps are
Step 7.1 obtains semi-matrix evaluation sample；
Step 7.2 carries out 3 kinds of analysis of misjudgement, is same sample car erroneous judgement, the erroneous judgement of different evaluation sequence and triangle circulation respectively
Erroneous judgement；In order to understand that first two is judged by accident, introducing Computer Aided Design r and i-i compare (same sample car compares) and k compares (no ij-ji
Compare with evaluation order)；Explain lower triangle circulation erroneous judgement emphatically again, i.e. A is better than B, and B is better than C, and C is again better than A, and here it is evaluations
The triangle that person is likely to occur recycles erroneous judgement；
The more interviewee that makes mistakes in step 7.3, every kind of erroneous judgement is not quite similar, and introduces weighted consistency coefficient ηwCome comprehensive
Close influence of the various erroneous judgements of evaluation to statistical result；
Step 7.4 screens evaluation result, and adhere to 2 principles here: 1. reject 10% subjective evaluation result；
2: consistency coefficient0.7 or more.
Step 7.5, the property q using antisymmetric matrixij+qji=0, the interviewee's evaluations matrix remained is filled out
It mends, for certain a line i, acquiresThen it is ranked up according to size, a certain estimator can be obtained to the row of m sample car
Sequence.
Further, in the step 8, the coefficient of rank correlation is one, and to can reflect relationship between 2 groups of sequences close
An index of degree is cut, with 2 estimator PjAnd PkTo the ordering vector (X of sample car collectionj1..., Xjm) and (Xk1..., Xkm)
To illustrate；rjkValue is between -1 and 1, if it is completely the same to be equal to 1 two sequences of explanation, if being equal to -1 explanation two
Sequence is completely inconsistent；
That is Spearman's correlation coefficient.
Further, the assembly of sample car subjective evaluation is carried out by the way of given threshold；
Step 1 calculates each estimator's subjective assessment sequence (Xk1..., Xkm) and objective sequence (Y1..., Ym) grade
Related coefficient is denoted as rk, k=1 ... l；
Step 2, result and data distribution given threshold δ according to step 11If 1 >=rk≥δ1, then estimator Mk
Evaluation result with to objectively evaluate result almost the same, be classified as set T1.Set T1Element number Ji Wei ∣ T1∣。
Subjective assessment is vibrated to gas braking light truck the beneficial effect comprise that the invention discloses one kind
Objective quantification method, objectively evaluated using total acceleration root-mean-square value as gas braking light truck idle vibration
Parameter solves the problems, such as that single acceleration root-mean-square value cannot fundamentally characterize vibration signal.Gas is braked in the present invention
The subjective assessment personnel of light truck idle vibration using different heights, different weight, different sexes, different age group,
The different driving ages, different majors degree personnel, solve the problems, such as that subjective assessment personnel cannot characterize Market Consumer.This
Invention, which can solve the interior vibration that gas braking light truck encounters in R&D process subjective evaluation is inconsistent, asks
Topic brakes the NVH goal decomposition in light truck exploitation for gas and provides reference with formulation, brakes light truck for gas
Comfort provide Appreciation gist.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is vehicle axis system structural schematic diagram of the invention.
Fig. 2 is seat guide rail arrangement schematic diagram of the invention.
Fig. 3 is subjective and objective assembly theory structure schematic diagram of the invention.
Specific embodiment
A kind of objective quantification method to gas braking light truck vibration subjective assessment is present embodiments provided, including
Acceleration transducer 1, as shown in Fig. 2, comprising the following specific steps that:
Step 1, by gas braking light truck vehicle (zero load) idling rest in it is open, by concrete, pitch or
The flat place that the stiff materials such as person's cement are constituted；
Step 2, acceleration transducer 1 is arranged at operator's seat seat rail, paste position is leading close to body side
Rail X-direction intermediate point (vehicle axis system is shown in Figure of description 1, wherein X-coordinate be from Chinese herbaceous peony to vehicle after, origin is located at automobile most
Front；Y-coordinate is the direction from driver to passenger, and origin is placed on the midpoint of left and right；Z coordinate is that from bottom to top, origin is placed on
On horizon.It is required that sensor used in test, instrument and meter have effective metering qualified by calibration and calibration
Card；
Step 3, acceleration transducer is connect with data acquisition device, and it is 512Hz that sample frequency, which is arranged,；
Step 4, start vehicle, so that vehicle is in idling operation, and close all attachmentes, after vehicle-state is stablized, adopt
Collect valid data, every group of signal acquisition 10s, each car acquires 3 groups of useful signals, acquires m (between m value 6-12) gas altogether
Brake light truck idle vibration time-domain signal；
Step 5, using signal processing software to each gas of acquisition brake light truck idle vibration time-domain signal into
The calculating of row objective parameter, vibration data uses steady state time mode, per second 5000 times average, linear averaging, overlapping 50%, meter
The root-mean-square value in 0~200Hz frequency range is calculated, resolution ratio 0.1Hz is calculated and mature signal analysis software, such as LMS be can be used
Test.lab calculates extensional vibration acceleration root-mean-square value axw, lateral vibration acceleration root-mean-square value aywAnd vertical vibration
Acceleration root-mean-square value azw, pilot set under idling operation, which is calculated, using following formula combines acceleration root-mean-square value:
Wherein 1.4 be acceleration weighting coefficient；
Step 6, subjective assessment personnel are selected, subjective assessment personnel number should be more than 20 people, subjective assessment personnel Ying Han
It covers different height, weight, gender, age bracket, driving age and whether is automobile major relevant staff, preferably the male of 4:1
Female's ratio, height 175cm or more are no less than 20%, no less than the 20% of weight 80kg or more, and 40 one full year of life are below should to account for 70%
More than, the evaluation personnel of no less than 3 year driving age should account for 80% or more, and automobile major especially NVH professional relevant staff is not
It obtains and is higher than 20%；
Step 7, related training should be carried out to evaluation personnel before evaluation, subjective evaluation method is familiar with, rectifies working attitude
And gentle mood, so that evaluation personnel is carried out subjective assessment with normal body and the state of mind, training must not have automobile water
The hint of flat superiority and inferiority and vibration quality guarantees that estimator is given a mark truly and effectively with subjective feeling；
Step 8, subjective assessment is carried out using Paired Comparisons, m sample car is passed through into permutation and combination, compares two-by-two, obtains
The evaluations matrix of one m*m, is denoted as Q.On the basis of not influencing evaluation test validity, to reduce workload, using half square
Battle array evaluation.If i and j respectively represent 2 vehicle samples.If it is considered to i is better than j, q is rememberedij=1；If i is similar with j, q is rememberedij
=0；If i ratio j is poor, q is rememberedij=-1.Ideally, matrix Q should be an antisymmetric matrix；
Wherein, step 8.1: obtaining semi-matrix evaluation sample；
Step 8.2: carrying out 3 kinds of analysis of misjudgement, be same sample car erroneous judgement, the erroneous judgement of different evaluation sequence and triangle circulation respectively
Erroneous judgement.In order to understand that first two is judged by accident, palpus introducing Computer Aided Design r and i-i compare (same sample car compares) and k compares ij-ji
(different evaluation sequence compares).Explain lower triangle circulation erroneous judgement emphatically again, i.e. A is better than B, and B is better than C, and C is again better than A, and here it is comment
The triangle that valence person is likely to occur recycles erroneous judgement；
Step 8.3: the more interviewee that makes mistakes in every kind of erroneous judgement is not quite similar, and introduces weighted consistency coefficient ηwCome comprehensive
Close influence of the various erroneous judgements of evaluation to statistical result；
Step 8.4: evaluation result being screened, adheres to 2 principles here: first is that the result of about 10% personnel should
To reject；Second is that consistency coefficient is 0.7 or more.The reliability of result is just relatively high in this way.
Step 8.5: utilizing the property q of antisymmetric matrixij+qji=0, the interviewee's evaluations matrix remained is filled out
It mends, for certain a line i, acquiresThen it is ranked up according to size, sequence of a certain estimator to m sample car can be obtained.
Step 9, sample car under an objective data is obtained by objectively evaluating system to sort, by subjective assessment system,
Obtain sequence of each respondent to sample car.Since data are all sort types, Spearman rank correlation system is utilized
It is several that it is handled, abbreviation coefficient of rank correlation.It, which is one, can reflect one of degree in close relations between 2 groups of sequences
A index, with 2 estimator PjAnd PkTo the ordering vector (X of sample car collectionj1..., Xjm) and (Xk1..., Xkm) illustrate.
rjkValue is between -1 and 1, if it is completely the same to be equal to 1 two sequences of explanation, if being equal to two sequences of -1 explanation completely not
Unanimously.
Automobile objectively evaluates result and obtains according to accurate test data.But vehicle be finally for customer service, because
This is in automobile product and management cycle, such as new car homophony is ground, commodity define investigation and the Satisfaction Research in later period is all
Understand the project of consumer information.As manufacturing enterprise, the hobby for understanding consumer has emphatically the production cycle of entire product
The influence wanted is the factor for needing to pay close attention to.
Set forth herein the assemblies that sample car subjective evaluation is carried out with the mode of given threshold.
Firstly, calculating each estimator's subjective assessment sequence (Xk1..., Xkm) and objective sequence (Y1..., Ym) grade
Related coefficient is denoted as rk, k=1 ... l.
Secondly, according to the result of step 1 and data distribution given threshold δ1If 1 >=rk≥δ1, then estimator Mk
Evaluation result with to objectively evaluate result almost the same, be classified as set T1.Set T1Element number Ji Wei ∣ T1∣。
Finally, assembling subjective and objective as a result, wherein objective sequence (Y1..., Ym) weight Wei ∣ T1∣/l is left (l- ∣ T1∣)
The weight of a subjective evaluation result is 1/l.The integrated ordered of sample car subjective evaluation can be obtained by weighted sum.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of objective quantification method to gas braking light truck vibration subjective assessment, it is characterised in that: including as follows
Method and step:
Step 1, gas braking light truck vehicle is in idling under light condition and rests in flat place；
Step 2, acceleration transducer (1) is arranged at operator's seat seat rail, affixes to the guide rail X-direction close to body side
Intermediate point, the acceleration transducer have the effective metering quality certification by calibration and calibration；
Step 3, acceleration transducer is connect with data acquisition device, and it is 512Hz that sample frequency, which is arranged,；
Step 4, start vehicle, so that vehicle is in idling operation, and close all attachmentes, after vehicle-state is stablized, acquisition has
Data, every group of signal acquisition 10s are imitated, each car acquires 3 groups of useful signals, and it is idle to acquire m vehicle gas braking light truck altogether
Speed vibration time-domain signal；
Step 5, visitor is carried out using each gas braking light truck idle vibration time-domain signal of the signal processing software to acquisition
See the calculating of parameter；
Step 6, subjective assessment personnel are selected, the number of the subjective assessment personnel is at least 20 people, and cover different height,
Weight, gender, age bracket, driving age and whether be automobile major relevant staff；
Step 7, subjective assessment is carried out using Paired Comparisons, m sample car is passed through into permutation and combination, compares two-by-two, obtains one
The evaluations matrix of m*m, is denoted as Q；On the basis of not influencing evaluation test validity, to reduce workload, commented using semi-matrix
Valence；If i and j respectively represent 2 vehicle samples；If it is considered to i is better than j, qij=1 is remembered；If i is suitable with j, qij=0 is remembered；Such as
Fruit i ratio j is poor, remembers qij=-1；Ideally, matrix Q should be an antisymmetric matrix；
Step 8, the sample car sequence under an objective data is obtained by objectively evaluating system, by subjective assessment system, obtained
Sequence of each respondent to sample car；Since data are all sort types, Spearman rank correlation coefficient pair is utilized
It is handled, abbreviation coefficient of rank correlation.
2. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: in the step 1, place to be measured be it is open, the flat place being made of stiff materials, the stiff materials are extremely
It is less concrete, pitch or cement.
3. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: in the step 4, the value of m is between 6~12.
4. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: in the step 5, vibration data uses steady state time mode, per second 5000 times average, linear averaging, overlapping 50%,
The root-mean-square value in 0~200Hz frequency range is calculated, resolution ratio 0.1Hz calculates extensional vibration acceleration root-mean-square value axw, laterally
Vibration acceleration root-mean-square value ayw and Vertical Acceleration root-mean-square value azw calculates driver under idling operation using following formula
Seat combines acceleration root-mean-square value:
Wherein 1.4 be acceleration weighting coefficient.
5. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: in the step 6, the male to female ratio of subjective assessment personnel selection 4:1, wherein the subjective assessment of height 175cm or more
Personnel are no less than 20%, and the subjective assessment personnel of weight 80kg or more are no less than 20%, 40 one full year of life subjective assessment personnel below
70% or more is accounted for, the evaluation personnel of no less than 3 year driving age accounts for 80% or more, the relevant subjectivity of automobile major especially NVH profession
Evaluation personnel must not be higher than 20%.
6. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: the step 7 the specific steps are
Step 7.1 obtains semi-matrix evaluation sample；
Step 7.2 carries out 3 kinds of analysis of misjudgement, is that same sample car erroneous judgement, the erroneous judgement of different evaluation sequence and triangle circulation are missed respectively
Sentence；In order to understand that first two is judged by accident, introducing Computer Aided Design r and i-i compare (same sample car compares) and k and compare (difference to ij-ji
Evaluation order compares)；Explain lower triangle circulation erroneous judgement emphatically again, i.e. A is better than B, and B is better than C, and C is again better than A, and here it is estimators
The triangle circulation erroneous judgement being likely to occur；
The more interviewee that makes mistakes in step 7.3, every kind of erroneous judgement is not quite similar, and introduces weighted consistency coefficient ηwIt is commented to integrate
Influence of the various erroneous judgements of valence to statistical result；
Step 7.4 screens evaluation result, and adhere to 2 principles here: 1. reject 10% subjective evaluation result；2: one
Property coefficient is caused to exist0.7 or more；
Step 7.5, the property q using antisymmetric matrixij+qji=0, the interviewee's evaluations matrix remained is filled up,
For certain a line i, acquireThen it is ranked up according to size, sequence of a certain estimator to m sample car can be obtained.
7. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: in the step 8, the coefficient of rank correlation, which is one, can reflect one of degree in close relations between 2 groups of sequences
A index, with 2 estimator PjAnd PkTo the ordering vector (X of sample car collectionj1..., Xjm) and (Xk1..., Xkm) illustrate；
rjkValue is between -1 and 1, if it is completely the same to be equal to 1 two sequences of explanation, if being equal to two sequences of -1 explanation completely not
Unanimously；
That is Spearman's correlation coefficient.
8. the objective quantification method according to claim 1 to gas braking light truck vibration subjective assessment, special
Sign is: the assembly of sample car subjective evaluation is carried out by the way of given threshold；
Step 1 calculates each estimator's subjective assessment sequence (Xk1..., Xkm) and objective sequence (Y1..., Ym) grade it is related
Coefficient is denoted as rk, k=1 ... l；
Step 2, result and data distribution given threshold δ according to step 11If 1 >=rk≥δ1, then estimator MkComment
Valence result with to objectively evaluate result almost the same, be classified as set T1.Set T1Element number Ji Wei ∣ T1∣。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484835A (en) * | 2020-12-03 | 2021-03-12 | 上海里莱技术服务中心 | Random vibration effective amplitude measuring method based on rain flow counting method |
| CN112924184A (en) * | 2021-01-22 | 2021-06-08 | 重庆长安汽车股份有限公司 | Device and method for objectively evaluating aftershock convergence of vehicle passing through deceleration strip |
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| CN114878122A (en) * | 2022-07-12 | 2022-08-09 | 中国飞机强度研究所 | Vibration evaluation method for aircraft cabin environment test |
| CN114878122B (en) * | 2022-07-12 | 2022-09-13 | 中国飞机强度研究所 | Vibration evaluation method for aircraft cabin environment test |
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