CN112347665A - Method, device and equipment for constructing association model of vehicle body structure and passenger damage evaluation - Google Patents
Method, device and equipment for constructing association model of vehicle body structure and passenger damage evaluation Download PDFInfo
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Abstract
The invention discloses a method for constructing a correlation model of a vehicle body structure and passenger damage evaluation, which comprises the following steps: acquiring parameters of preset vehicle body structure evaluation indexes; obtaining model input quantity according to parameters of the vehicle body structure evaluation indexes, inputting the model input quantity into a preset finite element passenger restraint system model, and obtaining parameters of corresponding passenger damage evaluation indexes through simulation calculation; analyzing the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the parameters of the vehicle body structure evaluation index and the parameters of the passenger damage evaluation index corresponding to the parameters; and establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation obtained by analysis. The invention also discloses a device and equipment for constructing the correlation model of the vehicle body structure and the passenger damage evaluation. By adopting the embodiment of the invention, the correlation model of the vehicle body structure and the damage evaluation of passengers is established for guiding the design of the vehicle body structure and shortening the development period of the vehicle collision safety.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method, a device and equipment for constructing a correlation model of a vehicle body structure and passenger damage evaluation.
Background
With the popularization of automobiles, traffic accidents frequently occur, serious casualties and property losses are caused, and automobile collision safety becomes a hotspot of modern automobile industry research. In the process of developing the automobile collision safety, the conventional flow of the collision safety performance is often as follows: the vehicle body structure design is firstly carried out, and then the passenger protection design is carried out based on the vehicle body structure design. The optimization of the vehicle body structure is a complex process, and generally hundreds of times of optimization calculation are carried out, and the passenger protection design is carried out along with hundreds of times of optimization calculation so as to timely evaluate whether the design of the vehicle body structure meets the design requirement of passenger protection.
The inventor finds that the following technical problems exist in the prior art in the process of implementing the invention: in the existing automobile collision safety development process, because the relation between the design of a vehicle body structure and the design requirement of passenger protection is not clear, whether the designed vehicle body structure meets the design requirement of passenger protection cannot be well predicted.
Disclosure of Invention
The invention aims to provide a method, a device and equipment for constructing a correlation model for evaluating the damage of a vehicle body structure and passengers, wherein the correlation model for evaluating the damage of the vehicle body structure and the passengers is established for evaluating whether the design of the vehicle body structure meets the requirement of the damage evaluation of the passengers, so that the design of the vehicle body structure is guided in time, and the development period of the collision safety of an automobile is shortened.
In order to achieve the above object, an embodiment of the present invention provides a method for constructing a correlation model between a vehicle body structure and occupant injury evaluation, including:
acquiring parameters of preset vehicle body structure evaluation indexes;
obtaining model input quantity according to the parameters of the vehicle body structure evaluation indexes, inputting the model input quantity into a preset finite element passenger restraint system model, and obtaining the parameters of the corresponding passenger damage evaluation indexes through simulation calculation;
analyzing the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the corresponding parameters of the passenger damage evaluation index;
and establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index obtained by analysis.
Compared with the prior art, the method for constructing the association model of the vehicle body structure and the passenger damage evaluation disclosed by the embodiment of the invention comprises the steps of firstly, obtaining model input quantity according to parameters of vehicle body structure evaluation indexes, inputting the model input quantity into a preset finite element passenger restraint system model, and obtaining the parameters of the corresponding passenger damage evaluation indexes through simulation calculation; then, analyzing the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the parameters of the obtained vehicle body structure evaluation index and the parameters of the passenger damage evaluation index corresponding to the parameters; and finally, establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation obtained by analysis. From the above analysis, the embodiment of the invention can construct the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index, so that the relationship between the vehicle body structure design and the design requirement of passenger protection can be accurately known, and after the correlation model is constructed, whether the designed vehicle body structure meets the design requirement of passenger protection can be predicted by using the correlation model, so that the design of the vehicle body structure can be rapidly optimized, and the development cycle of the automobile collision safety is shortened.
As an improvement of the scheme, the vehicle body structure is a vehicle front end structure and comprises a rigid barrier, a firewall and an engine arranged between the rigid barrier and the firewall.
As an improvement of the above, the vehicle body structure evaluation index includes first-order acceleration and firewall intrusion amount; wherein the content of the first and second substances,
the first-order acceleration is the acceleration generated in the first-order deformation area when the vehicle body structure is in a frontal collision; the first order deformation zone comprises an area between the rigid barrier and the engine and an area between the engine and the firewall;
the intrusion amount of the firewall is the amount of backward deformation displacement of the firewall when the front collision occurs to the vehicle body structure.
As an improvement of the above aspect, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the firewall invasion amount is kept unchanged, the relationship between the passenger injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept constant, the relationship between the occupant injury evaluation index and the firewall intrusion amount is in a negative correlation.
As an improvement of the above, the correlation model between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies the following formula:
Dtarget＝DMark alignment+ΔG1*2.0+ΔD2b*1.0
Wherein D isMark alignmentA safety threshold value which is a preset passenger injury evaluation index; dTargetAn occupant injury evaluation value as a target; Δ G1Is the variation of the first-order acceleration; delta D2bIs the amount of change in the intrusion amount of the firewall.
As an improvement of the above, the occupant injury evaluation index includes at least one of a chest injury value, a head injury value, and a leg injury value.
In order to achieve the above object, an embodiment of the present invention further provides an apparatus for constructing a correlation model between a vehicle body structure and occupant injury evaluation, including:
the parameter acquisition module is used for acquiring parameters of preset vehicle body structure evaluation indexes;
the model input quantity acquisition module is used for acquiring model input quantity according to the parameters of the vehicle body structure evaluation indexes;
the simulation calculation module is used for inputting the model input quantity into a preset finite element passenger restraint system model so as to obtain parameters of corresponding passenger damage evaluation indexes through simulation calculation;
the correlation analysis module is used for analyzing the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the corresponding parameters of the passenger damage evaluation index;
and the correlation model establishing module is used for establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index obtained through analysis.
Compared with the prior art, the device for constructing the association model of the vehicle body structure and the passenger damage evaluation disclosed by the embodiment of the invention comprises the following steps that firstly, a model input quantity acquisition module obtains a model input quantity according to parameters of vehicle body structure evaluation indexes, and a simulation calculation module inputs the model input quantity into a preset finite element passenger restraint system model to obtain the corresponding parameters of the passenger damage evaluation indexes through simulation calculation; then, the relevance analysis module analyzes the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the corresponding parameters of the passenger damage evaluation index; and finally, the correlation model establishing module establishes a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation obtained by analysis. From the above analysis, the embodiment of the invention can construct the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index, so that the relationship between the vehicle body structure design and the design requirement of passenger protection can be accurately known, and after the correlation model is constructed, whether the designed vehicle body structure meets the design requirement of passenger protection can be predicted by using the correlation model, so that the design of the vehicle body structure can be rapidly optimized, and the development cycle of the automobile collision safety is shortened.
As an improvement of the above scheme, the vehicle body structure is a vehicle front end structure and comprises a rigid barrier, a firewall and an engine arranged between the rigid barrier and the firewall;
the vehicle body structure evaluation indexes comprise first-order acceleration and firewall invasion amount; wherein the content of the first and second substances,
the first-order acceleration is the acceleration generated in the first-order deformation area when the vehicle body structure is in a frontal collision; the first order deformation zone comprises an area between the rigid barrier and the engine and an area between the engine and the firewall;
the intrusion amount of the firewall is the amount of backward deformation displacement of the firewall when the front collision occurs to the vehicle body structure.
As an improvement of the above aspect, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the firewall invasion amount is kept unchanged, the relationship between the passenger injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relationship between the occupant injury evaluation index and the firewall invasion amount is in negative correlation;
the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index meets the formula:
Dtarget＝DMark alignment+ΔG1*2.0+ΔD2b*1.0
Wherein D isMark alignmentA safety threshold value which is a preset passenger injury evaluation index; dTargetAn occupant injury evaluation value as a target; Δ G1Is the variation of the first-order acceleration; delta D2bIs the amount of change in the intrusion amount of the firewall.
In order to achieve the above object, the embodiment of the present invention further discloses an apparatus for constructing a model relating a vehicle body structure and an occupant injury evaluation, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the method for constructing the model relating the vehicle body structure and the occupant injury evaluation as described in any one of the above embodiments is implemented.
Drawings
FIG. 1 is a flow chart of a method of constructing a model of a vehicle body structure associated with occupant injury evaluation according to an embodiment of the present invention;
FIG. 2 is an exploded perspective view of a crash feature of the vehicle body structure in accordance with an embodiment of the present invention;
FIG. 3 is a graph of acceleration at various times after a frontal impact of the vehicle body structure in one embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the setting of an occupant injury evaluation index in one embodiment of the present invention;
FIG. 5 is a model schematic of a finite element occupant restraint system in accordance with an embodiment of the present invention;
FIG. 6 is a waveform of acceleration obtained when the intrusion amount of the firewall is kept constant and the first-order acceleration is changed according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the relationship between the acceleration obtained when the first-order acceleration is changed while keeping the intrusion amount of the firewall unchanged and the chest damage evaluation of the occupant according to an embodiment of the present invention;
FIG. 8 is a graph of acceleration waveforms obtained while maintaining first-order acceleration and varying firewall intrusion in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram showing the relationship between the acceleration obtained while keeping the first-order acceleration constant and changing the firewall intrusion amount and the evaluation of the chest injury of the occupant in one embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an apparatus for constructing a model relating a vehicle body structure to occupant injury evaluation according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an apparatus for constructing a model relating a vehicle body structure and occupant injury evaluation according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for constructing a correlation model between a vehicle body structure and an occupant injury evaluation according to an embodiment of the present invention; the method comprises the following steps:
s1, acquiring parameters of preset vehicle body structure evaluation indexes;
s2, obtaining model input quantity according to the parameters of the vehicle body structure evaluation indexes, inputting the model input quantity into a preset finite element passenger restraint system model, and obtaining the parameters of the corresponding passenger damage evaluation indexes through simulation calculation;
s3, analyzing the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the parameters of all the vehicle body structure evaluation indexes and the parameters of the corresponding passenger damage evaluation indexes;
and S4, establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index obtained by analysis.
Illustratively, referring to fig. 2, the vehicle body structure is a vehicle front end structure, and includes a rigid barrier 1, a firewall 3, and an engine 2 disposed between the rigid barrier 1 and the firewall 3. The vehicle body structure may be other parts of the vehicle body, such as a rear end structure of the vehicle body, a left side structure of the vehicle body, a right side structure of the vehicle body, and the like, and is not particularly limited herein.
In order to facilitate understanding of the embodiments of the present invention, the following description is exemplified herein with the vehicle body structure as the vehicle front end structure:
the vehicle body structure includes an undeformable region and a deformable region. Wherein, the non-deformable region D3 is the space occupied by the rigid engine, and the deformable region is composed of a deformable region D1 and a deformable region D2; the deformation zone D1 is a front energy-absorbing space, which is the structural deformation of the area between the front end of the engine 2 and the rigid barrier 1; the deformation region D2 is composed of a rear energy absorption region D2a and a front wall deformable region D2b, the rear energy absorption region D2a is a structural deformation of a region between the rear end of the engine 2 and the firewall 3, the front wall deformable region D2b can be represented by a firewall intrusion amount, and the firewall intrusion amount D2b is an amount of rearward deformation displacement of the firewall 3 in a frontal collision of the vehicle body structure.
As shown in fig. 3, the frontal crash acceleration-time history of the vehicle body structure can be divided into three main phases: g1(0-Te), G2(Te-Tr) and G3(Tr-0.09), wherein Origin Data is an actual acceleration waveform, EDTC is a second-order equivalent waveform after the actual acceleration waveform is simplified, and after an actual vehicle collision waveform is simplified into the second-order equivalent waveform, the influence of typical characteristics of the waveform on the damage of passengers can be conveniently researched, so that reasonable structural indexes are formulated. The demarcation points of the equivalent second order waveform in fig. 3 are time Te and time Tr, respectively, time Te being the time when the engine contacts the rigid barrier, and time Tr being the time when the vehicle starts to bounce. In the embodiment of the invention, the contact time Te of the rigid barrier when the engine collides is taken as a dividing point, and the acceleration of the vehicle body at the moment is equivalent to the first-order acceleration G1 and the second-order acceleration G2. The first-order acceleration G1 is the acceleration generated by a first-order deformation zone when the vehicle body structure is in a frontal collision, the first-order deformation zone comprises a zone between the rigid barrier and the engine (namely the deformation zone D1) and a zone between the engine and the firewall (namely the rear energy absorption zone D2a), G1 represents the structural design level of a front overhang, and the change of G1 can be realized by changing the rigidity of an energy absorption box and an anti-collision beam; the second-order acceleration G2 is mainly affected by the intrusion amount of the firewall (i.e., the cowl deforming region D2b), and represents the structural design level of the cowl, and the change of D2b can be realized by changing the rigidity of the firewall.
According to the above description, the vehicle body structure evaluation indexes are divided into vehicle body accelerations (including first-order acceleration G1 and second-order acceleration G2) and dynamic displacements (representing deformation amounts of the whole vehicle, including a front energy-absorbing space D1, a rear energy-absorbing space D2a and a firewall intrusion amount D2 b). According to the principle of energy conservation (namely when the vehicle collides at a certain speed, the total collision energy of the vehicle is constant), under the condition that the firewall intrusion amount D2b is not changed, the first-order acceleration G1 is changed, and the second-order acceleration G2 is also changed correspondingly; when the first-order acceleration G1 is unchanged, the firewall intrusion amount D2b is changed, and the second-order acceleration G2 is also changed accordingly. Therefore, the evaluation condition of the vehicle body structure in the embodiment of the invention can be simplified into two conditions: in the first case, the first-order acceleration G1 is changed without changing the firewall intrusion amount D2 b; in case two, the first-order acceleration G1 is not changed, and the firewall intrusion amount D2b is changed.
Referring to fig. 4, common occupant injury evaluations include head injury evaluation, chest injury evaluation, and leg injury evaluation, and according to actual project development experience, in a general collision accident, head injury and leg injury of an occupant are often low and are not key evaluation indexes, while chest injury is a common injury in a collision accident, so in an embodiment of the present invention, the chest injury value may be selected as a key index for occupant injury evaluation, but in other embodiments, the occupant injury evaluation index may include at least one of a chest injury value, a head injury value, and a leg injury value, and all fall within the protection scope of the present invention. Wherein the chest injury value may be expressed in terms of chest compression.
Specifically, in step S1, the vehicle body structure evaluation index may be analyzed and preset by a designer according to practical experience; the parameters of the vehicle body structure evaluation index can be preset by designers based on the design condition of the vehicle body structure, so that whether the currently designed vehicle body structure meets the design requirements can be analyzed by the parameters in the following process. In step S2, the finite element occupant restraint system model is used to characterize the occupant restraint system and to analyze occupant injury during a collision, and the model is schematically illustrated in fig. 5, including a vehicle body structure and a simulated driver (occupant). In the process of building the finite element occupant restraint system model, the occupant restraint system of the vehicle needs to be cured, parameters in the curing configuration process are selected according to table 1, the occupant restraint system is a system which is used for a specific vehicle type or a manufacturer-defined type and approved by a detection mechanism, and consists of a seat and a safety belt on the seat, and in addition, all elements (such as an air bag) for reducing injury of a wearer by limiting the movement of the body of the wearer when the vehicle is suddenly decelerated are included.
TABLE 1 preferred curing configuration for standard restraint systems
After the passenger restraint system is solidified, a simulated working condition collision test based on the finite element passenger restraint system model is carried out, so that an acceleration waveform simulated in the process of simulating the collision of the vehicle is obtained. It should be noted that, the specific establishment manner of the finite element occupant restraint system model may refer to the prior art, and is not described and limited herein.
In the case that the firewall intrusion amount D2b is unchanged, for example, 10 sets of equivalent acceleration waveforms (equivalent waveforms of acceleration waveforms generated during the whole process of frontal collision of the vehicle body under simulation) are obtained by changing the first-order acceleration G1 as model input amounts, and as shown in fig. 6, as G1 increases, G2 decreases in different magnitudes. When the vehicle body structure evaluation index includes the first-order acceleration, the obtained equivalent acceleration waveforms (for example, the above 10 groups of equivalent acceleration waveforms) are input into a preset finite element occupant restraint system model as input quantities, parameters of corresponding occupant injury evaluation indexes (for example, chest injury evaluation) are obtained through simulation calculation, that is, 10 groups of acceleration waveforms are subjected to simulation calculation, and a relation diagram of different acceleration waveforms and occupant injury evaluation is obtained, as shown in fig. 7.
In addition, for example, in the case that the first-order acceleration G1 is not changed, by changing the firewall intrusion amount D2b (D2b is changed, so that the second-order acceleration is changed, and thus the equivalent acceleration waveform of the vehicle body in the whole simulated collision process is changed), 5 sets of equivalent acceleration waveforms are obtained, as shown in fig. 8, the first-order acceleration G1 is not changed, and the second-order acceleration G2 is reduced in different amplitudes as the firewall intrusion amount D2b is increased. When the vehicle body structure evaluation index includes the firewall intrusion amount D2b, the obtained equivalent acceleration waveforms (for example, the above 5 groups of acceleration waveforms) are input into a preset finite element occupant restraint system model as input quantities, so as to obtain parameters of the corresponding occupant injury evaluation index (for example, chest injury evaluation) through simulation calculation, that is, the 5 groups of acceleration waveforms are subjected to simulation calculation, so as to obtain a relationship diagram between different acceleration waveforms and occupant injury evaluation, as shown in fig. 9.
Specifically, in step S3, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index is analyzed based on the obtained parameter of the vehicle body structure evaluation index and the corresponding parameter of the occupant injury evaluation index. Preferably, the chest injury value is taken as an example for analysis and explanation.
Referring to fig. 7, before 38ms, the chest injury value increases with the first-order acceleration under the action of the safety belt, after 38ms, the air bag is in contact with the chest, the chest injury value begins to decrease, then the chest injury value shows a decreasing trend with the increase of the first-order acceleration under the combined action of the safety belt and the air bag, and the steering column finishes collapsing and the chest injury value shows a decreasing trend between 63ms and 70 ms; the decomposition of the change cause of the chest injury value shows that the change of the chest injury value can be mainly divided into three stages: stage one, before the air bag contacts the chest at the initial moment; step two, the airbag contacts with the chest and then the steering column begins to collapse; and step three, after the steering column collapses, ending the collision. The influence of the first-order acceleration G1 is always accepted in the stage, the influence factor of the restraint system is single, the influence factor of the restraint system is directly influenced by the second-order acceleration G2 in the stage two, the influence factor of the restraint system is single, the vehicle body starts to bounce in the stage three, the steering column starts to collapse, and the influence factor of the restraint system is complex; therefore, the change of the chest injury value in the second stage is the most direct reaction to the acceleration of the vehicle body. And at the second 63ms moment, the change rule of the chest injury value is obvious, when the first-order acceleration G1 is less than or equal to 22G, the chest injury value is obviously influenced, the chest injury value is reduced by about 2mm when the first-order acceleration G1 is increased by 1G, and when the first-order acceleration G1 is greater than 22G, the change of the chest injury value is small. In summary, it can be concluded that: when the firewall intrusion amount D2b is kept constant, the relationship between the occupant injury evaluation index and the first-order acceleration G1 index is in a negative correlation; i.e., the chest injury value decreases by about 2mm for every 1G increase in first order acceleration G1.
As above, at the second 64ms in the stage of fig. 9 (the time of collapse of the steering column), the chest damage value change rule is obvious, and the change of the firewall intrusion amount D2b has a significant influence on the chest damage value change, which can be concluded: when the first-order acceleration G1 is kept constant, the relationship between the occupant injury evaluation index and the firewall intrusion amount D2b is in a negative correlation; namely, the chest injury value is reduced by about 1mm for every 10mm increase of the firewall invasion amount D2 b.
Specifically, in step S4, a correlation model of the vehicle body structure evaluation index and the occupant injury evaluation index is constructed according to the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index obtained in step S3, and the correlation model satisfies the following formula:
Dtarget＝DMark alignment+ΔG1*2.0+ΔD2b*1.0
Wherein D isMark alignmentA safety threshold value which is a preset passenger injury evaluation index; dTargetAn occupant injury evaluation value as a target; Δ G1Is the variation of the first-order acceleration; delta D2bIs the amount of change in the intrusion amount of the firewall.
When the evaluation index of the vehicle body structure changes, the damage condition of the passenger can be directly obtained through the formula, for example, the chest damage value is reduced by 3mm when G1 is increased by 1G and D2b is increased by 10 mm. The formula can be used for evaluating whether the design of the vehicle body structure meets the passenger damage evaluation requirement, for example, in the development process of a certain vehicle type, the safety threshold of the passenger damage evaluation index is DMark alignment53.4mm, development Objective DTarget49mm, in order to achieveTo the development target, an optimization scheme of increasing 2G by G1 and increasing 10mm by D is provided according to the actual situation of the vehicle body structure, so that the design of the vehicle body structure is guided in time, the vehicle body structure meets the design requirement of protecting passengers, and the development period of the vehicle collision safety is shortened.
Compared with the prior art, the method for constructing the association model of the vehicle body structure and the passenger damage evaluation disclosed by the embodiment of the invention comprises the following steps that firstly, a model input quantity acquisition module obtains a model input quantity according to parameters of vehicle body structure evaluation indexes, and a simulation calculation module inputs the model input quantity into a preset finite element passenger restraint system model to obtain the corresponding parameters of the passenger damage evaluation indexes through simulation calculation; then, analyzing the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the parameters of the obtained vehicle body structure evaluation index and the parameters of the passenger damage evaluation index corresponding to the parameters; and finally, establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation obtained by analysis. From the above analysis, the embodiment of the invention can construct the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index, so that the relationship between the vehicle body structure design and the design requirement of passenger protection can be accurately known, and after the correlation model is constructed, whether the designed vehicle body structure meets the design requirement of passenger protection can be predicted by using the correlation model, so that the design of the vehicle body structure can be rapidly optimized, and the development cycle of the automobile collision safety is shortened.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an apparatus 10 for constructing a correlation model between a vehicle body structure and an occupant injury evaluation according to an embodiment of the present invention; the method comprises the following steps:
the parameter acquisition module 11 is used for acquiring parameters of preset vehicle body structure evaluation indexes;
the model input quantity acquisition module 12 is used for acquiring a model input quantity according to the parameters of the vehicle body structure evaluation indexes;
the simulation calculation module 13 is configured to input the model input quantity into a preset finite element occupant restraint system model, so as to obtain parameters of corresponding occupant injury evaluation indexes through simulation calculation;
a correlation analysis module 14 configured to analyze a correlation between the vehicle body structure evaluation index and the occupant damage evaluation index based on the obtained parameter of the vehicle body structure evaluation index and the corresponding parameter of the occupant damage evaluation index;
and the correlation model establishing module 15 is configured to establish a correlation model of the vehicle body structure evaluation index and the occupant damage evaluation index according to the correlation between the vehicle body structure evaluation index and the occupant damage evaluation index obtained through analysis.
Preferably, the vehicle body structure is a vehicle front end structure and comprises a rigid barrier, a firewall and an engine arranged between the rigid barrier and the firewall.
Preferably, the vehicle body structure evaluation index includes first-order acceleration and firewall intrusion amount; wherein the content of the first and second substances,
the first-order acceleration is the acceleration generated in the first-order deformation area when the vehicle body structure is in a frontal collision; the first order deformation zone comprises an area between the rigid barrier and the engine and an area between the engine and the firewall;
the intrusion amount of the firewall is the amount of backward deformation displacement of the firewall when the front collision occurs to the vehicle body structure.
Preferably, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the firewall invasion amount is kept unchanged, the relationship between the passenger injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relationship between the occupant injury evaluation index and the firewall invasion amount is in negative correlation;
the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index meets the formula:
Dtarget＝DMark alignment+ΔG1*2.0+ΔD2b*1.0
Wherein D isMark alignmentA safety threshold value which is a preset passenger injury evaluation index; dTargetAn occupant injury evaluation value as a target; Δ G1Is the variation of the first-order acceleration; delta D2bIs the amount of change in the intrusion amount of the firewall.
For a specific working process of the apparatus 10 for building a correlation model of a vehicle body structure and an occupant injury evaluation, please refer to the working process of the method for building a correlation model of a vehicle body structure and an occupant injury evaluation described in the first embodiment, which is not described herein again.
Compared with the prior art, the device 10 for constructing the association model of the vehicle body structure and the passenger damage evaluation disclosed by the embodiment of the invention comprises the following steps that firstly, a model input quantity acquisition module 12 obtains model input quantity according to parameters of vehicle body structure evaluation indexes, and a simulation calculation module 13 inputs the model input quantity into a preset finite element passenger restraint system model to obtain parameters of corresponding passenger damage evaluation indexes through simulation calculation; then, the relevance analysis module 14 analyzes the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameter of the vehicle body structure evaluation index and the corresponding parameter of the passenger damage evaluation index; finally, the correlation model establishing module 15 establishes a correlation model of the vehicle body structure evaluation index and the occupant damage evaluation index according to the correlation obtained by the analysis. From the above analysis, the embodiment of the invention can construct the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index, so that the relationship between the vehicle body structure design and the design requirement of passenger protection can be accurately known, and after the correlation model is constructed, whether the designed vehicle body structure meets the design requirement of passenger protection can be predicted by using the correlation model, so that the design of the vehicle body structure can be rapidly optimized, and the development cycle of the automobile collision safety is shortened.
Referring to fig. 11, fig. 11 is a schematic structural diagram of an apparatus for constructing a correlation model between a vehicle body structure and occupant injury evaluation according to an embodiment of the present invention; the apparatus 20 of constructing a correlation model of a vehicle body structure and occupant injury evaluation of this embodiment includes: a processor 21, a memory 22 and a computer program stored in said memory 22 and executable on said processor 21. The processor 21, when executing the computer program, implements the steps in each of the above-described embodiments of the method of constructing a model relating a vehicle body structure to an occupant injury assessment, such as step S1 shown in fig. 1. Alternatively, the processor 21, when executing the computer program, implements the functions of the modules/units in the above-mentioned device embodiments, such as the parameter obtaining module 11.
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 22 and executed by the processor 21 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the apparatus 20 for constructing a model relating vehicle body structure to occupant injury assessment. For example, the computer program may be divided into a parameter obtaining module 11, a model input amount obtaining module 12, a simulation calculating module 13, a correlation analyzing module 14, and a correlation model establishing module 15, and for specific functions of each module, reference is made to the working process of the apparatus 10 for establishing a correlation model between a vehicle body structure and an occupant injury evaluation described in the second embodiment, which is not described herein again.
The device 20 for constructing the association model of the vehicle body structure and the passenger injury evaluation may be a desktop computer, a notebook computer, a palm computer, a cloud server, or other computing devices. The apparatus 20 for constructing the correlation model of the vehicle body structure and the occupant injury evaluation may include, but is not limited to, a processor 21 and a memory 22. It will be understood by those skilled in the art that the schematic diagram is merely an example of the apparatus 20 for constructing a model relating vehicle body structure to occupant injury assessment and does not constitute a limitation of the apparatus 20 for constructing a model relating vehicle body structure to occupant injury assessment, and may include more or fewer components than shown, or some components in combination, or different components, for example, the apparatus 20 for constructing a model relating vehicle body structure to occupant injury assessment may also include input-output devices, network access devices, buses, etc.
The Processor 21 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The processor 21 is a control center of the apparatus 20 for building a correlation model between a vehicle body structure and an occupant injury evaluation, and various interfaces and lines are used to connect the whole apparatus 20 for building a correlation model between a vehicle body structure and an occupant injury evaluation.
The memory 22 may be used for storing the computer programs and/or modules, and the processor 21 may implement various functions of the apparatus 20 for constructing a model relating a vehicle body structure to an occupant injury evaluation by operating or executing the computer programs and/or modules stored in the memory 22 and calling up data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 22 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein the modules/units integrated by the apparatus 20 for constructing a correlation model of a vehicle body structure with an occupant injury evaluation, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and used by the processor 21 to implement the steps of the above embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method of constructing a correlation model of a vehicle body structure and occupant injury assessment, comprising:
acquiring parameters of preset vehicle body structure evaluation indexes;
obtaining model input quantity according to the parameters of the vehicle body structure evaluation indexes, inputting the model input quantity into a preset finite element passenger restraint system model, and obtaining the parameters of the corresponding passenger damage evaluation indexes through simulation calculation;
analyzing the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the corresponding parameters of the passenger damage evaluation index;
and establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index obtained by analysis.
2. A method of constructing a model of a vehicle body structure associated with occupant injury assessment according to claim 1 wherein said vehicle body structure is a vehicle front end structure comprising a rigid barrier, a firewall and an engine disposed between said rigid barrier and said firewall.
3. A method of constructing a model of correlation of a vehicle body structure with an occupant injury evaluation as set forth in claim 2, wherein the vehicle body structure evaluation index includes a first-order acceleration and a firewall intrusion amount; wherein the content of the first and second substances,
the first-order acceleration is the acceleration generated in the first-order deformation area when the vehicle body structure is in a frontal collision; the first order deformation zone comprises an area between the rigid barrier and the engine and an area between the engine and the firewall;
the intrusion amount of the firewall is the amount of backward deformation displacement of the firewall when the front collision occurs to the vehicle body structure.
4. A method of constructing a model relating a vehicle body structure to an occupant injury evaluation as set forth in claim 3, wherein the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the firewall invasion amount is kept unchanged, the relationship between the passenger injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept constant, the relationship between the occupant injury evaluation index and the firewall intrusion amount is in a negative correlation.
5. The method of constructing a model relating a vehicle body structure to an occupant injury evaluation according to claim 4, wherein the model relating the vehicle body structure evaluation index to the occupant injury evaluation index satisfies the formula:
Dtarget＝DMark alignment+ΔG1*2.0+ΔD2b*1.0
Wherein D isMark alignmentA safety threshold value which is a preset passenger injury evaluation index; dTargetAn occupant injury evaluation value as a target; Δ G1Is the variation of the first-order acceleration; delta D2bIs the amount of change in the intrusion amount of the firewall.
6. A method of constructing a model of a vehicle body structure associated with an occupant injury assessment according to any of claims 1 to 5, wherein said occupant injury assessment indicator comprises at least one of a chest injury value, a head injury value and a leg injury value.
7. An apparatus for constructing a correlation model of a vehicle body structure and occupant injury evaluation, comprising:
the parameter acquisition module is used for acquiring parameters of preset vehicle body structure evaluation indexes;
the model input quantity acquisition module is used for acquiring model input quantity according to the parameters of the vehicle body structure evaluation indexes;
the simulation calculation module is used for inputting the model input quantity into a preset finite element passenger restraint system model so as to obtain parameters of corresponding passenger damage evaluation indexes through simulation calculation;
the correlation analysis module is used for analyzing the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the corresponding parameters of the passenger damage evaluation index;
and the correlation model establishing module is used for establishing a correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index obtained through analysis.
8. The apparatus for constructing a correlation model of a vehicle body structure and occupant injury assessment as claimed in claim 7, wherein said vehicle body structure is a vehicle front end structure comprising a rigid barrier, a firewall and an engine disposed between said rigid barrier and said firewall;
the vehicle body structure evaluation indexes comprise first-order acceleration and firewall invasion amount; wherein the content of the first and second substances,
the first-order acceleration is the acceleration generated in the first-order deformation area when the vehicle body structure is in a frontal collision; the first order deformation zone comprises an area between the rigid barrier and the engine and an area between the engine and the firewall;
the intrusion amount of the firewall is the amount of backward deformation displacement of the firewall when the front collision occurs to the vehicle body structure.
9. The apparatus for constructing a model relating a vehicle body structure to an occupant injury evaluation according to claim 8, wherein a correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the firewall invasion amount is kept unchanged, the relationship between the passenger injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relationship between the occupant injury evaluation index and the firewall invasion amount is in negative correlation;
the correlation model of the vehicle body structure evaluation index and the passenger damage evaluation index meets the formula:
Dtarget＝DMark alignment+ΔG1*2.0+ΔD2b*1.0
Wherein D isMark alignmentA safety threshold value which is a preset passenger injury evaluation index; dTargetAn occupant injury evaluation value as a target; Δ G1Is the variation of the first-order acceleration; delta D2bIs the amount of change in the intrusion amount of the firewall.
10. An apparatus for constructing a model relating a vehicle body structure to an occupant injury assessment, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing the method of constructing the model relating a vehicle body structure to an occupant injury assessment according to any one of claims 1 to 6.
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