CN109506948B - Method for evaluating vehicle collision structure performance - Google Patents

Method for evaluating vehicle collision structure performance Download PDF

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CN109506948B
CN109506948B CN201811279610.4A CN201811279610A CN109506948B CN 109506948 B CN109506948 B CN 109506948B CN 201811279610 A CN201811279610 A CN 201811279610A CN 109506948 B CN109506948 B CN 109506948B
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朱海涛
杨佳璘
张斌
何成
张瑞亮
田威
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China Automotive Technology and Research Center Co Ltd
CATARC Automotive Test Center Tianjin Co Ltd
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CATARC Automotive Test Center Tianjin Co Ltd
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Abstract

The invention provides a method for judging the performance of a vehicle collision structure, which is matched with the transverse index VSI of the vehicle collision structurestep1And VSIstep2Longitudinal index of vehicle crash structure HSIstep1And HSIstep2The device can accurately and quantitatively test and judge the performance of the vehicle collision structure, can guide manufacturers to design vehicles, not only pay attention to how to protect passengers of the vehicle in a collision accident, but also reduce the damage to the vehicle collided by the other party, solves the difference of front-end collision structures between vehicles at the same level or adjacent levels, avoids the damage degree of the vehicles in the collision of the two vehicles, and has the characteristics of wide applicable vehicle types and accurate quantitative judgment effect.

Description

Method for evaluating vehicle collision structure performance
Technical Field
The invention belongs to the field of vehicle collision safety performance detection, and particularly relates to a method for judging vehicle collision structure performance.
Background
With the improvement of automobile safety technology, most automobile models can obtain high scores in NCAP (non-conventional vehicle Access Point) frontal collision tests at present, but traffic accident statistics shows that the automobile-to-automobile collision accident is still one of main causes of passenger casualties, and the number of the fatalities accounts for about half of the total number of fatalities of automobile accidents. The reason for this is that the occupant is not protected enough by the weak side in the collision accident due to the difference in mass, rigidity and geometric shape between the two colliding parts. The source of this problem is the current lack of crash-compatible technical constraints on the vehicle, which places more attention on the vehicle occupant protection than the other occupant protection during the design process.
Although such collision accidents occur frequently and the mortality rate is high, the test based on collision compatibility is not included in the collision regulation and new vehicle safety evaluation system. In recent years, as the number of types of automobile products increases, and in particular, as the proportion of large vehicles such as SUVs becomes larger, the problem of lack of collision compatibility of vehicles becomes more prominent. How to accurately judge the collision structural performance of the automobile becomes a technical problem which needs to be solved urgently, and the method has important significance for improving the safety of vehicle design and reducing the personnel damage in traffic accidents.
Disclosure of Invention
In view of the above, the present invention is directed to a method for evaluating the performance of a vehicle crash structure, using a vehicle crash structure lateral index VSI in cooperationstep1And VSIstep2Longitudinal index of vehicle crash structure HSIstep1And HSIstep2The vehicle collision structure performance can be accurately and perfectly quantitatively analyzed, tested and judged.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for evaluating vehicle crash structure performance, comprising:
step 1: judging area division and data acquisition by a force measuring wall;
the ground clearance at the lower end of the force measuring wall is 80mm, and the surface of the force measuring wall is covered and paved by a force sensor with the size of 125mm multiplied by 125mm serving as a load unit; dividing 3-4 lines of load cells on the surface of the force measuring wall into 3-4 lines of step1 areas, and dividing 2-5 lines of load cells on the surface of the force measuring wall into 2-5 lines of step2 areas; each load cell is set to XijI is a row and j is a column, and each load cell X is collectedijPeak force before 40 ms;
step 2: calculating a vehicle crash structure lateral index VSIstep1And VSIstep2；
First, the VSI is calculatedstep1：
Calculating the sum F of peak forces of all load cells on the force measuring wallSAnd divided by 5 to give the valueTarget row unit load FtargetIf F istargetGreater than 100KN, then FtargetThe value is 100 KN; if FtargetLess than or equal to 100KN, then FtargetValue of FS/5；
Calculating the negative deviation NDev FiIs the sum of the load peak forces of i rows, i equals 3 and 4, if FiLess than FtargetWhen NDev is equal to Ftarget-Fi(ii) a If FiGreater than or equal to FtargetOtherwise, NDev is 0;
VSIstep1the sum of the NDev values of rows 3-4 NDev (n);
second calculate VSIstep2：
Calculating the sum F of peak forces of all load cells on the force measuring wallSAnd divided by 5 to determine the target row unit load FtargetIf F istargetGreater than 100KN, then FtargetThe value is 100 KN; if FtargetLess than or equal to 100KN, then FtargetValue of FS/5；
Calculating the negative deviation NDev FiIs the sum of the i rows load peak forces, i equals 2 and 5, if FiLess than FtargetWhen NDev is equal to Ftarget-Fi(ii) a If FiGreater than or equal to FtargetOtherwise, NDev is 0;
calculating the sum of NDev values of the 2 nd to5 th rows and carrying out normalization processing to obtain NDevn；
Figure GDA0002685079230000031
NDevrangeMeans a range of NDev values from row 2to row 5, with an assignment of 100 KN;
Figure GDA0002685079230000032
σrow(2to5)is the standard deviation of the second through fifth row impact force peaks;
Frow(2to5)is the average of the second through fifth row impact force peaks;
CVrangeis the second to fifth row CV value range, assigned a value of 1;
Figure GDA0002685079230000033
namely: a sum of the weighted normalized balance index and the weighted normalized impact force index; alpha and beta are preset weight values;
and step 3: calculating vehicle crash structure longitudinal index HSIstep1And HSIstep2；
The HSI index corresponds to a vehicle horizontal direction structure, and when data division processing is carried out, the force measuring wall judgment area in the step1 is divided into a middle area, a peripheral left area and a peripheral right area according to the vehicle width range; wherein, the middle area covers the middle 4 rows of load units; the two side areas of the periphery are the envelope areas in which 6 middle rows are removed in the area corresponding to 80% of the car width;
target load TCiDetermining: calculate load cell peak force F for rows 2to5i，FiIs the sum of the i row load peak forces, i ═ 2 and 5, target load TCiHas a value of FiDivided by vehicle width multiplied by load cell size, i.e. TCi＝(FiVehicle width) 125;
middle zone load negative deviation normalized value NDevcentre(n): for each row, i-3 and 4, the central four load cells are calculated, j-7 to 10, and the target load TCiIf x is a negative deviation NDevijLess than TCiWhen NDev is equal to TCi-xijIf x isijGreater than or equal to TCiOtherwise, NDev is 0; then, the sum of NDev values of the 3 rd row and the 4 th row is calculated, and then the sum is divided by the number of columns 4 to obtain NDevcentre(n)A value;
negative deviation normalization value NDev of load of peripheral regionouter(n): calculating a negative deviation NDev, j of the periphery from the target load, i.e. a column bounded by 80% of the vehicle width, excluding the central six columns, if x is 100% overlapping the load cell whenijLess than TCiWhen NDev is equal to TCi-xij(ii) a If xijGreater than or equal to TCiIf NDev is 0; when partially overlapping the load cell, if xijIs less Than (TC)iOverlap ratio/125), when NDev ═ TCiOverlap ratio/125) -xijIf x isijGreater than or equal To (TC)iOverlap ratio
/125) when NDev is 0, overlap ratio is (80%/125 of vehicle width) - (80%/125 of vehicle width)Get the wholeFurther, the sum NDev of the NDev values of the 3 rd row and the 4 th row is calculatedouterDividing the value by the number of columns after normalization to obtain NDevouter(n)The number of columns is 2 x (80%/125% of the vehicle width) -6;
HSIstep1＝α*NDevcentre(n)+β*NDevouter(n)
alpha and beta are preset weight values;
HSIstep2repeating the above process for rows 2to5, i ═ 2-5;
and 4, step 4: according to vehicle collision structure transverse index VSIstep1And VSIstep2Longitudinal index HSIstep1And HSIstep2Obtaining a vehicle collision structure index SI;
vehicle crash structure index SI pass VSIstep1And VSIstep2And HSIstep1And HSIstep2Judging two groups of factors; vehicle crash structure lateral index VSIstep1And VSIstep2The lower the vehicle crash structure index SI, the better the vehicle crash structure performance; HSIstep1And HSIstep2The lower the vehicle crash structure index SI, the better the vehicle crash structure performance.
Further, the method comprises the following steps: in step1, each load cell X is acquiredijThe values are processed using CFC60 filtering.
Further, in step 2: the predetermined weight values of alpha, beta are 1: 1.
Further, in step 3: the predetermined weight values of alpha, beta are 1: 1.
Compared with the prior art, the method for judging the performance of the vehicle collision structure has the following advantages that:
the method for judging the vehicle collision structure performance can realize accurate quantitative test and judgment on the vehicle collision structure performance, can guide manufacturers to design vehicles, not only pay attention to how to protect passengers of the vehicles in a collision accident, but also reduce the damage to the vehicles collided by the other party, solves the difference of front end collision structures between the vehicles of the same grade or adjacent grades, avoids the vehicle damage degree in the collision of the two vehicles, and has the characteristics of wide applicable vehicle types and accurate quantitative judgment effect.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a first schematic view of a method for assessing the performance of a vehicle crash structure according to an embodiment of the present invention;
FIG. 2 is a second schematic view of a method for evaluating the performance of a vehicle crash structure according to an embodiment of the present invention;
FIG. 3 is a third schematic view of a method for evaluating the performance of a vehicle crash structure according to an embodiment of the present invention;
FIG. 4 is a fourth schematic view of the method for evaluating the performance of a vehicle crash structure according to the embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 4, a method for evaluating the performance of a collision structure of a vehicle includes:
step 1: judging area division and data acquisition by a force measuring wall;
the ground clearance at the lower end of the force measuring wall is 80mm, and the surface of the force measuring wall is covered and paved by a force sensor with the size of 125mm multiplied by 125mm serving as a load unit; dividing 3-4 lines of load cells on the surface of the force measuring wall into 3-4 lines of step1 areas, and dividing 2-5 lines of load cells on the surface of the force measuring wall into 2-5 lines of step2 areas; each load cell is set to XijI is a row and j is a column, and each load cell X is collectedijPeak force before 40 ms;
step 2: calculating a vehicle crash structure lateral index VSIstep1And VSIstep2；
First, the VSI is calculatedstep1：
Calculating the sum F of peak forces of all load cells on the force measuring wallSAnd divided by 5 to determine the target row unit load FtargetIf F istargetGreater than 100KN, then FtargetThe value is 100 KN; if FtargetLess than or equal to 100KN, then FtargetValue of FS/5；
Calculating the negative deviation NDev FiIs the sum of the load peak forces of i rows, i equals 3 and 4, if FiLess than FtargetWhen NDev is equal to Ftarget-Fi(ii) a If FiGreater than or equal to FtargetOtherwise, NDev is 0;
VSIstep1the sum of the NDev values of rows 3-4 NDev (n);
second calculate VSIstep2：
Calculating the sum F of peak forces of all load cells on the force measuring wallSAnd divided by 5 to determine the target row unit load FtargetIf F istargetGreater than 100KN, then FtargetThe value is 100 KN; if FtargetLess than or equal to 100KN, then FtargetValue of FS/5；
Calculating the negative deviation NDev FiIs the sum of the i rows load peak forces, i equals 2 and 5, if FiLess than FtargetWhen NDev is equal to Ftarget-Fi(ii) a If FiGreater than or equal to FtargetOtherwise, NDev is 0;
calculating the sum of NDev values of the 2 nd to5 th rows and carrying out normalization processing to obtain NDevn；
Figure GDA0002685079230000081
NDevrangeMeans a range of NDev values from row 2to row 5, with an assignment of 100 KN;
Figure GDA0002685079230000082
σ row (2to5) is the standard deviation of the second through fifth row impact force peaks;
frow (2to5) is the average of the second-row to fifth-row impact force peaks;
CVrangeis the second to fifth row CV value range, assigned a value of 1;
Figure GDA0002685079230000083
namely: a sum of the weighted normalized balance index and the weighted normalized impact force index; alpha and beta are preset weight values;
as shown in fig. 3-4:
and step 3: calculating longitudinal indexes HSIstep1 and HSIstep2 of the vehicle collision structure;
the HSI index corresponds to a vehicle horizontal direction structure, and when data division processing is carried out, the force measuring wall judgment area in the step1 is divided into a middle area, a peripheral left area and a peripheral right area according to the vehicle width range; wherein, the middle area covers the middle 4 rows of load units; the two side areas of the periphery are the envelope areas in which 6 middle rows are removed in the area corresponding to 80% of the car width;
target load TCiDetermining: calculate load cell peak force F for rows 2to5i，FiThe sum of the load peak forces of the i rows, i is 2 and 5; target load TCiHas a value of FiDivided by vehicle width multiplied by load cell size, i.e. TCi＝(FiVehicle width) 125;
middle zone load negative deviation normalized value NDevcentre(n): for each row, i-3 and 4, the central four load cells are calculated, j-7 to 10, and the target load TCiIf x is a negative deviation NDevijLess than TCiWhen NDev is equal to TCi-xijIf x isijGreater than or equal to TCiOtherwise, NDev is 0; then, the sum of NDev values of the 3 rd row and the 4 th row is calculated, and then the sum is divided by the number of columns 4 to obtain NDevcentre(n)A value;
negative deviation normalization value NDev of load of peripheral regionouter(n): calculating a negative deviation NDev, j of the periphery from the target load, i.e. a column bounded by 80% of the vehicle width, excluding the central six columns, if x is 100% overlapping the load cell whenijLess than TCiWhen NDev is equal to TCi-xij(ii) a If xijGreater than or equal to TCiIf NDev is 0; when partially overlapping the load cell, if xijIs less Than (TC)iOverlap ratio/125), when NDev ═ TCiOverlap ratio/125) -xijIf x isijGreater than or equal To (TC)iOverlap ratio
/125) when NDev is 0, overlap ratio is (80%/125 of vehicle width) - (80%/125 of vehicle width)Get the wholeFurther, the sum NDev of the NDev values of the 3 rd row and the 4 th row is calculatedouterDividing the value by the number of columns after normalization to obtain NDevouter(n)The number of columns is 2 x (80%/125% of the vehicle width) -6;
HSIstep1＝α*NDevcentre(n)+β*NDevouter(n)
alpha and beta are preset weight values;
HSIstep2repeating the above process for rows 2to5, i ═ 2-5;
and 4, step 4: according to vehicle collision structure transverse index VSIstep1And VSIstep2Longitudinal index HSIstep1And HSIstep2Obtaining a vehicle collision structure index SI;
vehicle crash structure index SI pass VSIstep1And VSIstep2And HSIstep1And HSIstep2Judging two groups of factors; vehicle crash structure lateral index VSIstep1And VSIstep2The lower the vehicle crash structure index SI, the better the vehicle crash structure performance; HSIstep1And HSIstep2The lower the vehicle crash structure index SI, the better the vehicle crash structure performance.
In step1, each load cell X is acquiredijThe values are processed using CFC60 filtering.
In step 2: the predetermined weight values of alpha, beta are 1: 1.
In step 3: the predetermined weight values of alpha, beta are 1: 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (4)

1. A method for evaluating the performance of a vehicle crash structure, characterized by: the method comprises the following steps:
step 1: judging area division and data acquisition by a force measuring wall;
the ground clearance at the lower end of the force measuring wall is 80mm, and the surface of the force measuring wall is covered and paved by a force sensor with the size of 125mm multiplied by 125mm serving as a load unit; dividing 3-4 lines of load cells on the surface of the force measuring wall into 3-4 lines of step1 areas, and dividing 2-5 lines of load cells on the surface of the force measuring wall into 2-5 lines of step2 areas; each load cell is set to XijI is a row and j is a column, and each load cell X is collectedijPeak force before 40 ms;
step 2: calculating a vehicle crash structure lateral index VSIstep1And VSIstep2；
First, the VSI is calculatedstep1：
Calculating the sum F of peak forces of all load cells on the force measuring wallSAnd divided by 5 to determine the target row unit load FtargetIf F istargetGreater than 100KN, then FtargetThe value is 100 KN; if FtargetLess than or equal to 100KN, then FtargetValue of FS/5；
Calculating the negative deviation NDev FiIs the sum of the load peak forces of i rows, i equals 3 and 4, if FiLess than FtargetWhen NDev is equal to Ftarget-Fi(ii) a If FiGreater than or equal to FtargetOtherwise, NDev is 0;
VSIstep1the sum of the NDev values of rows 3-4 NDev (n);
second calculate VSIstep2：
Calculating the sum F of peak forces of all load cells on the force measuring wallSAnd divided by 5 to determine the target row unit load FtargetIf F istargetGreater than 100KN, then FtargetThe value is 100 KN; if FtargetLess than or equal to 100KN, then FtargetValue of FS/5；
Calculating the negative deviation NDev FiIs the sum of the i rows load peak forces, i equals 2 and 5, if FiLess than FtargetWhen NDev is equal to Ftarget-Fi(ii) a If FiGreater than or equal to FtargetOtherwise, NDev is 0;
calculating the sum of NDev values of the 2 nd to5 th rows and carrying out normalization processing to obtain NDevn；
Figure FDA0002685079220000021
NDevrangeMeans a range of NDev values from row 2to row 5, with an assignment of 100 KN;
Figure FDA0002685079220000022
σrow(2to5)is the standard deviation of the second through fifth row impact force peaks;
Frow(2to5)is the average of the second through fifth row impact force peaks;
CVrangeis the second to fifth row CV value range, assigned a value of 1;
Figure FDA0002685079220000023
namely: a sum of the weighted normalized balance index and the weighted normalized impact force index; alpha and beta are preset weight values;
and step 3: calculating vehicle crash structure longitudinal index HSIstep1And HSIstep2；
The HSI index corresponds to a vehicle horizontal direction structure, and when data division processing is carried out, the force measuring wall judgment area in the step1 is divided into a middle area, a peripheral left area and a peripheral right area according to the vehicle width range; wherein, the middle area covers the middle 4 rows of load units; the two side areas of the periphery are the envelope areas in which 6 middle rows are removed in the area corresponding to 80% of the car width;
target load TCiDetermining: calculate load cell peak force F for rows 2to5i，FiIs the sum of the i row load peak forces, i ═ 2 and 5, target load TCiHas a value of FiDivided by vehicle width multiplied by load cell size, i.e. TCi＝(FiVehicle width) 125;
middle zone load negative deviation normalized value NDevcentre(n): for each row, i-3 and 4, the central four load cells are calculated, j-7 to 10, and the target load TCiIf x is a negative deviation NDevijLess than TCiWhen NDev is equal to TCi-xijIf x isijGreater than or equal to TCiOtherwise, NDev is 0; then, the sum of NDev values of the 3 rd row and the 4 th row is calculated, and then the sum is divided by the number of columns 4 to obtain NDevcentre(n)A value;
negative deviation normalization value NDev of load of peripheral regionouter(n): calculating a negative deviation NDev, j of the periphery from the target load, i.e. a column bounded by 80% of the vehicle width, excluding the central six columns, if x is 100% overlapping the load cell whenijLess than TCiWhen NDev is equal to TCi-xij(ii) a If xijGreater than or equal to TCiIf NDev is 0; when partially overlapping the load cell, if xijIs less Than (TC)iOverlap ratio/125), when NDev ═ TCiOverlap ratio/125) -xijIf x isijGreater than or equal To (TC)iOverlap/125) when NDev is 0;
overlap ratio (80%/125 of vehicle width) - (80%/125 of vehicle width)Get the wholeFurther, the sum NDev of the NDev values of the 3 rd row and the 4 th row is calculatedouterDividing the value by the number of columns after normalization to obtain NDevouter(n)The number of columns is 2 x (80%/125% of the vehicle width) -6;
HSIstep1＝α*NDevcentre(n)+β*NDevouter(n)
alpha and beta are preset weight values;
HSIstep2repeating the above process for rows 2to5, i ═ 2-5;
and 4, step 4: according to vehicle collision structure transverse index VSIstep1And VSIstep2Longitudinal index HSIstep1And HSIstep2Obtaining a vehicle collision structure index SI;
vehicle crash structure index SI pass VSIstep1And VSIstep2And HSIstep1And HSIstep2Judging two groups of factors; vehicle crash structure lateral index VSIstep1And VSIstep2The lower the vehicle crash structure index SI, the better the vehicle crash structure performance; HSIstep1And HSIstep2The lower the vehicle crash structure index SI, the better the vehicle crash structure performance.
2. A method for evaluating the performance of a vehicle crash structure according to claim 1, characterized in that: the method comprises the following steps: in step1, each load cell X is acquiredijThe values are processed using CFC60 filtering.
3. A method for evaluating the performance of a vehicle crash structure according to claim 1, characterized in that: in step 2: the predetermined weight values of alpha, beta are 1: 1.
4. A method for evaluating performance of a vehicle crash structure according to claim 3, characterized in that: in step 3: the predetermined weight values of alpha, beta are 1: 1.
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