CN112347665B - Method, device and equipment for constructing association model of vehicle body structure and occupant injury evaluation - Google Patents
Method, device and equipment for constructing association model of vehicle body structure and occupant injury evaluation Download PDFInfo
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Abstract
The invention discloses a method for constructing a correlation model of a vehicle body structure and occupant injury evaluation, which comprises the following steps: acquiring parameters of a preset vehicle body structure evaluation index; obtaining model input quantity according to parameters of the vehicle body structure evaluation index, and inputting the model input quantity into a preset finite element occupant restraint system model to obtain parameters of the corresponding occupant injury evaluation index through simulation calculation; according to the obtained parameters of the vehicle body structure evaluation index and the parameters of the passenger damage evaluation index corresponding to the parameters, the correlation between the vehicle body structure evaluation index and the passenger damage evaluation index is analyzed; 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 association model of the vehicle body structure and the passenger damage evaluation. By adopting the embodiment of the invention, the association model of the vehicle body structure and the passenger damage evaluation is established and is used for guiding the design of the vehicle body structure and shortening the development period of the collision safety of the vehicle.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method, an apparatus, and a device for constructing a correlation model of a vehicle body structure and occupant injury evaluation.
Background
With the popularization of automobiles, traffic accidents frequently occur, causing serious casualties and property loss, and automobile collision safety becomes a hot spot of modern automobile industry research. In the development process of automobile crash safety, the conventional flow of crash safety performance is often: advanced vehicle body structural design, and then development of occupant protection design based on the vehicle body structural design. The optimization of the vehicle body structure is a complicated process, and generally, hundreds of optimization calculations are performed, and the occupant protection design is performed for hundreds of times, so as to timely evaluate whether the design of the vehicle body structure meets the design requirement of occupant protection.
The present inventors have found that in the process of implementing the present invention, the following technical problems exist in the prior art: in the existing automobile collision safety development process, the relation between the design of the automobile body structure and the design requirement of the passenger protection is not clear, so that whether the designed automobile body structure meets the design requirement of the passenger protection cannot be well predicted.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device and equipment for constructing a correlation model of a vehicle body structure and passenger damage evaluation, which are used for evaluating whether the design of the vehicle body structure meets the passenger damage evaluation requirement or not, so that the design of the vehicle body structure is guided in time, and the development period of automobile collision safety is shortened.
In order to achieve the above object, an embodiment of the present invention provides a method for constructing a correlation model of a vehicle body structure and occupant injury evaluation, including:
Acquiring parameters of a preset vehicle body structure evaluation index;
Obtaining model input quantity according to the parameters of the vehicle body structure evaluation index, and inputting the model input quantity into a preset finite element occupant restraint system model to obtain the parameters of the corresponding occupant injury evaluation index through simulation calculation;
According to the obtained parameters of the vehicle body structure evaluation index and the parameters of the passenger damage evaluation index corresponding to the parameters, the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index is analyzed;
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 through analysis.
Compared with the prior art, the method for constructing the association model of the vehicle body structure and the occupant injury evaluation disclosed by the embodiment of the invention comprises the steps of firstly, obtaining the model input quantity according to the parameters of the vehicle body structure evaluation index, and inputting the model input quantity into a preset finite element occupant restraint system model to obtain the parameters of the corresponding occupant injury evaluation index through simulation calculation; then, according to the parameters of the obtained vehicle body structure evaluation index and the parameters of the corresponding passenger damage evaluation index, the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index is analyzed; 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, it can be known that the embodiment of the invention can construct the association model of the vehicle body structure evaluation index and the occupant injury evaluation index, so that the relationship between the vehicle body structure design and the occupant protection design requirement can be accurately known, and after the association model is constructed, whether the designed vehicle body structure meets the occupant protection design requirement can be predicted by using the association model, so that the design of the vehicle body structure can be optimized rapidly, and the development period of the vehicle collision safety is shortened.
As an improvement of the above-mentioned aspect, the vehicle body structure is a vehicle front end structure including a rigid barrier, a firewall, and an engine provided between the rigid barrier and the firewall.
As an improvement of the above-described aspect, the vehicle body structure evaluation index includes a first-order acceleration and a firewall intrusion amount; wherein,
The first-order acceleration is acceleration generated by a first-order deformation area when the vehicle body structure collides with the front surface; the first order deformation zone includes an area between the rigid barrier and the engine and an area between the engine and the firewall;
the firewall intrusion amount is an amount by which the firewall is deformed and displaced rearward when the vehicle body structure collides with the front face.
As an improvement of the above-described aspect, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the fire wall intrusion amount is kept unchanged, the relation between the occupant injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relation between the occupant injury evaluation index and the firewall intrusion amount is inversely related.
As an improvement of the above-described aspect, the association model of both the vehicle body structure evaluation index and the occupant injury evaluation index satisfies the formula:
D Target object ＝D Mark for marking +ΔG1*2.0+ΔD2b*1.0
Wherein D Mark for marking is a safety threshold of a preset occupant injury evaluation index; d Target object is an occupant injury evaluation value of the target; Δg 1 is the amount of change in the first-order acceleration; Δd 2b is the variation of the intrusion of the firewall.
As an improvement of the above-described aspect, 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 of a vehicle body structure and occupant injury evaluation, including:
The parameter acquisition module is used for acquiring parameters of a preset vehicle body structure evaluation index;
the model input quantity acquisition module is used for acquiring the model input quantity according to the parameters of the vehicle body structure evaluation index;
the simulation calculation module is used for inputting 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;
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 parameters of the passenger damage evaluation index corresponding to the parameters;
And the association model building module is used for building an association model of the vehicle body structure evaluation index and the occupant injury evaluation index according to the association between the vehicle body structure evaluation index and the occupant injury evaluation index obtained through analysis.
Compared with the prior art, the device for constructing the association model of the vehicle body structure and the occupant injury evaluation disclosed by the embodiment of the invention comprises the steps that firstly, a model input quantity acquisition module obtains a model input quantity according to parameters of the vehicle body structure evaluation index, and a simulation calculation module inputs the model input quantity into a preset finite element occupant restraint system model to obtain parameters of the corresponding occupant injury evaluation index through simulation calculation; then, the relevance analysis module analyzes 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 parameters of the passenger damage evaluation index corresponding to the parameters; and finally, the association model establishing module establishes an association model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the association obtained by analysis. From the above analysis, it can be known that the embodiment of the invention can construct the association model of the vehicle body structure evaluation index and the occupant injury evaluation index, so that the relationship between the vehicle body structure design and the occupant protection design requirement can be accurately known, and after the association model is constructed, whether the designed vehicle body structure meets the occupant protection design requirement can be predicted by using the association model, so that the design of the vehicle body structure can be optimized rapidly, and the development period of the vehicle collision safety is shortened.
As an improvement of the above-mentioned scheme, the vehicle body structure is a front end structure of a vehicle, and includes a rigid barrier, a firewall, and an engine disposed between the rigid barrier and the firewall;
the vehicle body structure evaluation index comprises first-order acceleration and firewall intrusion quantity; wherein,
The first-order acceleration is acceleration generated by a first-order deformation area when the vehicle body structure collides with the front surface; the first order deformation zone includes an area between the rigid barrier and the engine and an area between the engine and the firewall;
the firewall intrusion amount is an amount by which the firewall is deformed and displaced rearward when the vehicle body structure collides with the front face.
As an improvement of the above-described aspect, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the fire wall intrusion amount is kept unchanged, the relation between the occupant injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relation between the occupant injury evaluation index and the firewall intrusion amount is in negative correlation;
the association model of the vehicle body structure evaluation index and the passenger damage evaluation index satisfies the formula:
D Target object ＝D Mark for marking +ΔG1*2.0+ΔD2b*1.0
Wherein D Mark for marking is a safety threshold of a preset occupant injury evaluation index; d Target object is an occupant injury evaluation value of the target; Δg 1 is the amount of change in the first-order acceleration; Δd 2b is the variation of the intrusion of the firewall.
To achieve the above object, an embodiment of the present invention further discloses an apparatus for constructing a model of association of a vehicle body structure with occupant injury evaluation, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the method for constructing a model of association of a vehicle body structure with occupant injury evaluation as described in any one of the embodiments above when the computer program is executed.
Drawings
FIG. 1 is a flow chart of a method of constructing a correlation model of a vehicle body structure and occupant injury assessment, according to one embodiment of the present invention;
Fig. 2 is a schematic exploded view of a crash structure of a vehicle body structure in an embodiment of the invention;
fig. 3 is a graph showing acceleration generated at different times after a frontal collision of a vehicle body structure in an embodiment of the present invention;
fig. 4 is a schematic view showing the setting of an occupant injury evaluation index in an embodiment of the invention;
FIG. 5 is a schematic representation of a finite element occupant restraint system according to an embodiment of the present invention;
FIG. 6 is a graph of acceleration waveforms obtained while maintaining the firewall intrusion and varying the first order acceleration in an embodiment of the invention;
FIG. 7 is a schematic diagram showing the relationship between acceleration obtained when the first-order acceleration is changed while the firewall intrusion is kept constant and the chest injury evaluation of the occupant in an embodiment of the invention;
FIG. 8 is a waveform of acceleration obtained while keeping first-order acceleration unchanged and changing the intrusion of the firewall in accordance with an embodiment of the invention;
FIG. 9 is a schematic diagram of the relationship between acceleration and occupant chest injury assessment obtained while maintaining first-order acceleration and varying firewall intrusion in an embodiment of the invention;
fig. 10 is a schematic structural view of an apparatus for constructing a correlation model of a vehicle body structure and occupant injury evaluation according to an embodiment of the present invention;
fig. 11 is a schematic structural view of an apparatus for constructing a correlation model of a vehicle body structure and occupant injury evaluation according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for constructing a correlation model of a vehicle body structure and occupant injury assessment according to an embodiment of the present invention; the method comprises the following steps:
S1, acquiring parameters of a preset vehicle body structure evaluation index;
s2, obtaining model input quantity according to parameters of the vehicle body structure evaluation index, and inputting the model input quantity into a preset finite element occupant restraint system model to obtain parameters of a corresponding occupant injury evaluation index through simulation calculation;
S3, analyzing the relevance of the vehicle body structure evaluation index and the passenger damage evaluation index according to the obtained parameters of all the vehicle body structure evaluation indexes and the corresponding parameters of the passenger damage evaluation indexes;
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 through analysis.
For example, referring to fig. 2, the vehicle body structure is a vehicle front end structure including a rigid barrier 1, a firewall 3, and an engine 2 provided between the rigid barrier 1 and the firewall 3. The vehicle body structure may be another part of the vehicle body, for example, a rear end structure of the vehicle body, a left side structure of the vehicle body, or a right side structure of the vehicle body, and is not particularly limited herein.
In order to facilitate understanding of the embodiments of the present invention, the following description will be given by taking the vehicle body structure as the vehicle front end structure:
The vehicle body structure includes a non-deformable region and a deformable region. Wherein the non-deformable region D3 is the space occupied by the rigid engine, and the deformable region consists of a deformation region D1 and a deformation region D2; the deformation zone D1 is a front energy absorption space and is the structural deformation of the area between the front end of the engine 2 and the rigid barrier 1; the deformation zone D2 is composed of a rear energy absorption zone D2a and a front wall deformable zone D2b, the rear energy absorption zone D2a is structural deformation of a zone between the rear end of the engine 2 and the firewall 3, the front wall deformable zone 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 when the vehicle body structure collides with the front surface.
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 the actual vehicle collision waveform is simplified into the second-order equivalent waveform, the influence of typical characteristics of the waveform on passenger injury can be conveniently researched, so that reasonable structural indexes are formulated. The demarcation points for the equivalent second order waveforms in fig. 3 are time Te and time Tr, respectively, where time Te is the time when the engine is in contact with the rigid barrier and time Tr is the time when the vehicle begins to bounce. In the embodiment of the invention, the contact time Te of the impact rigid barrier of the engine is taken as a demarcation point, and the acceleration of the vehicle body at the moment is equivalent to a first-order acceleration G1 and a second-order acceleration G2. The first-order acceleration G1 is an acceleration generated by a first-order deformation zone when the vehicle body structure collides with the front surface, 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 D2 a), the G1 represents the structural design level of the front suspension, and the change of G1 can be realized by changing the rigidity of the energy absorption box and the anti-collision beam; the second-order acceleration G2 is mainly affected by the intrusion amount of the firewall (i.e., the deformation zone D2b of the front wall), and the structural design level of the front wall is represented, and the change of D2b can be realized by changing the stiffness of the firewall.
According to the above description, the vehicle body structure evaluation index is divided into vehicle body acceleration (including first-order acceleration G1 and second-order acceleration G2) and dynamic displacement (representing the deformation 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 conservation of energy (i.e. when the vehicle collides with a certain speed, the total collision energy of the vehicle is constant), under the condition that the fire wall intrusion D2b is unchanged, the first-order acceleration G1 is changed, and the second-order acceleration G2 is correspondingly changed; under the condition that the first-order acceleration G1 is unchanged, the firewall intrusion quantity D2b is changed, and the second-order acceleration G2 is correspondingly changed. The vehicle body structure evaluation conditions in the embodiment of the invention can be simplified into two conditions: the first-order acceleration G1 is changed without changing the fire wall intrusion D2 b; the second and first-order accelerations G1 are unchanged, and the firewall intrusion D2b is changed.
Referring to fig. 4, the common occupant injury evaluation includes a head injury evaluation, a chest injury evaluation, and a leg injury evaluation, and according to practical project development experience, in a general collision accident, the head injury and the leg injury of the occupant tend to be relatively low, and thus are not key evaluation indexes, whereas the chest injury is a common injury in the collision accident, so in the embodiment of the present invention, the chest injury value may be selected as a key index for the 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, which are all within the 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 a designer based on the design condition of the vehicle body structure, so that whether the currently designed vehicle body structure meets the design requirement can be analyzed by the parameters. In step S2, the finite element occupant restraint system model is used to characterize the occupant restraint system and to analyze occupant injury of the occupant at the time of collision, and a schematic diagram of the model is shown in fig. 5, including the vehicle body structure and the simulated driver (occupant). In constructing the finite element occupant restraint system model, the occupant restraint system of the vehicle needs to be cured, and the parameters for the curing configuration process can be found in table 1, wherein the occupant restraint system is a system defined by a specific vehicle type or manufacturer and approved by a detection mechanism, and consists of a seat and a safety belt on the seat, and further comprises all elements (such as an airbag) for reducing injury to the wearer by limiting movement of the body of the wearer when the vehicle suddenly decelerates.
Table 1 curing configuration of a preferred Standard constraint System
After the occupant restraint system is solidified, a simulated working condition collision test based on a finite element occupant restraint system model is carried out, so that an acceleration waveform obtained by simulating the vehicle in the simulated collision process is obtained. It should be noted that, the specific building manner of the finite element occupant restraint system model may refer to the prior art, and is not described and limited herein.
In this example, under the condition that the firewall intrusion amount D2b is unchanged, by changing the first-order acceleration G1, 10 sets of equivalent acceleration waveforms (equivalent waveforms of acceleration waveforms generated in the whole process of the front collision of the vehicle body under simulation) are obtained 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 as input amounts into a preset finite element occupant restraint system model, parameters of the corresponding occupant injury evaluation index (for example, chest injury evaluation) are obtained through simulation calculation, namely, the 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 where the first-order acceleration G1 is unchanged, by changing the firewall intrusion amount D2b (the change of D2b causes the change of the second-order acceleration, so that the equivalent acceleration waveform in the whole simulated crash process of the vehicle body is changed), 5 sets of equivalent acceleration waveforms are obtained, and as shown in fig. 8, the first-order acceleration G1 is not changed, and the second-order acceleration G2 is reduced in different magnitudes 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 sets of acceleration waveforms) are input as input amounts into a preset finite element occupant restraint system model, parameters of the corresponding occupant injury evaluation index (for example, chest injury evaluation) are obtained through simulation calculation, that is, the 5 sets of acceleration waveforms are subjected to simulation calculation, and a relationship diagram between different acceleration waveforms and occupant injury evaluation is obtained, 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 parameters of the vehicle body structure evaluation index and the parameters of the occupant injury evaluation index corresponding thereto. Preferably, the analysis is performed using chest injury values as an example.
Referring to fig. 7, before 38ms, only under the action of the safety belt, the chest damage value increases along with the first-order acceleration, after 38ms, the air bag contacts with the chest, the chest damage value starts to decrease, then under the combined action of the safety belt and the air bag, the chest damage value shows a trend of decreasing along with the increase of the first-order acceleration, and the steering column is completely collapsed at 63ms to 70ms, and the chest damage value shows a trend of decreasing; as can be seen from the decomposition of the cause of the chest injury, the chest injury can be divided into three main phases: stage one, the initial moment until the air bag contacts with chest; step two, after the airbag contacts with the chest, the steering column begins to collapse; and step three, after the steering column collapses, ending the collision. The first-order acceleration G1 is always accepted in the stage, the influence factor of the restraint system is single, the second-order acceleration G2 is directly accepted in the stage, the influence factor of the restraint system is single, the third-order vehicle body starts to rebound in the stage, 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 stage two is the most direct response to the acceleration of the vehicle body. At the moment of 63ms in the second stage, the change rule of the chest injury value is obvious, when the first-order acceleration G1 is less than or equal to 22G, the influence on the chest injury value is obvious, when the first-order acceleration G1 is increased by 1G, the chest injury value is reduced by about 2mm, and when the first-order acceleration G1 is more than 22G, the change on the chest injury value is smaller. In summary, it can be concluded that: when the firewall intrusion amount D2b remains unchanged, the relationship between the occupant injury evaluation index and the first-order acceleration G1 index is inversely related; i.e. the chest injury value decreases by about 2mm for each 1G increase in first order acceleration G1.
As above, at the second 64ms time (steering column collapse time) in the stage of fig. 9, the change rule of the chest damage value is obvious, and the change of the firewall intrusion D2b has a significant influence on the chest damage value, so that it can be concluded that: when the first-order acceleration G1 is kept unchanged, the relationship between the occupant injury evaluation index and the firewall intrusion amount D2b is inversely related; i.e. the chest lesion value decreases by about 1mm for every 10mm increase in the firewall intrusion D2 b.
Specifically, in step S4, a correlation model of both the vehicle body structure evaluation index and the occupant injury evaluation index is constructed according to the correlation of the vehicle body structure evaluation index and the occupant injury evaluation index obtained in step S3, the correlation model satisfying the formula:
D Target object ＝D Mark for marking +ΔG1*2.0+ΔD2b*1.0
Wherein D Mark for marking is a safety threshold of a preset occupant injury evaluation index; d Target object is an occupant injury evaluation value of the target; Δg 1 is the amount of change in the first-order acceleration; Δd 2b is the variation of the intrusion of the firewall.
When the vehicle body structure evaluation index changes, the occupant injury condition can be directly obtained through the formula, and if the G1 is increased by 1G and the D2b is increased by 10mm, the chest injury value is reduced by 3mm. The formula can be used for evaluating whether the design of the vehicle body structure meets the requirement of passenger damage evaluation, for example, in the development process of a certain vehicle type, the safety threshold of the passenger damage evaluation index is D Mark for marking =53.4 mm, and the development target is D Target object =49 mm, so that in order to achieve the development target, an optimization scheme of increasing G1 by 2G and increasing D by 10mm is provided according to the actual condition of the vehicle body structure, and the design of the vehicle body structure is guided in time, so that the vehicle body structure meets the design requirement of passenger protection, and the development period of automobile collision safety is shortened.
Compared with the prior art, the method for constructing the association model of the vehicle body structure and the occupant injury evaluation disclosed by the embodiment of the invention comprises the steps that firstly, a model input quantity acquisition module obtains a model input quantity according to parameters of the vehicle body structure evaluation index, and a simulation calculation module inputs the model input quantity into a preset finite element occupant restraint system model to obtain parameters of the corresponding occupant injury evaluation index through simulation calculation; then, according to the parameters of the obtained vehicle body structure evaluation index and the parameters of the corresponding passenger damage evaluation index, the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index is analyzed; 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, it can be known that the embodiment of the invention can construct the association model of the vehicle body structure evaluation index and the occupant injury evaluation index, so that the relationship between the vehicle body structure design and the occupant protection design requirement can be accurately known, and after the association model is constructed, whether the designed vehicle body structure meets the occupant protection design requirement can be predicted by using the association model, so that the design of the vehicle body structure can be optimized rapidly, and the development period of the vehicle collision safety is shortened.
Referring to fig. 10, fig. 10 is a schematic structural view of an apparatus 10 for constructing a model of association of a vehicle body structure with occupant injury assessment according to an embodiment of the present invention; comprising the following steps:
a parameter obtaining module 11, configured to obtain parameters of a preset vehicle body structure evaluation index;
A model input obtaining module 12, configured to obtain a model input according to the parameters of the vehicle body structure evaluation index;
The simulation calculation module 13 is used for inputting the model input quantity into a preset finite element occupant restraint system model 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 injury evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the parameters of the occupant injury evaluation index corresponding to the parameters;
And the association model establishing module 15 is used for establishing an association model of the vehicle body structure evaluation index and the passenger damage evaluation index according to the association between the vehicle body structure evaluation index and the passenger damage evaluation index obtained through analysis.
Preferably, the vehicle body structure is a front end structure of a vehicle, and includes a rigid barrier, a firewall, and an engine disposed between the rigid barrier and the firewall.
Preferably, the vehicle body structure evaluation index includes a first-order acceleration and a firewall intrusion amount; wherein,
The first-order acceleration is acceleration generated by a first-order deformation area when the vehicle body structure collides with the front surface; the first order deformation zone includes an area between the rigid barrier and the engine and an area between the engine and the firewall;
the firewall intrusion amount is an amount by which the firewall is deformed and displaced rearward when the vehicle body structure collides with the front face.
Preferably, the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the fire wall intrusion amount is kept unchanged, the relation between the occupant injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relation between the occupant injury evaluation index and the firewall intrusion amount is in negative correlation;
the association model of the vehicle body structure evaluation index and the passenger damage evaluation index satisfies the formula:
D Target object ＝D Mark for marking +ΔG1*2.0+ΔD2b*1.0
Wherein D Mark for marking is a safety threshold of a preset occupant injury evaluation index; d Target object is an occupant injury evaluation value of the target; Δg 1 is the amount of change in the first-order acceleration; Δd 2b is the variation of the intrusion of the firewall.
The working process of the device 10 for constructing a model related to the vehicle body structure and the occupant injury evaluation is described in detail with reference to the working process of the method for constructing a model related to the vehicle body structure and the occupant injury evaluation in the above embodiment, and will not be described herein.
Compared with the prior art, the device 10 for constructing the association model of the vehicle body structure and the occupant injury evaluation disclosed by the embodiment of the invention comprises the steps that firstly, a model input quantity is obtained by a model input quantity obtaining module 12 according to parameters of the vehicle body structure evaluation index, and the model input quantity is input into a preset finite element occupant restraint system model by a simulation calculation module 13 so as to obtain the parameters of the corresponding occupant injury evaluation index through simulation calculation; then, the correlation analysis module 14 analyzes the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index according to the obtained parameters of the vehicle body structure evaluation index and the parameters of the occupant injury evaluation index corresponding to the parameters; finally, the correlation model establishing module 15 establishes a correlation model of both the vehicle body structure evaluation index and the occupant injury evaluation index based on the correlation obtained by the analysis. From the above analysis, it can be known that the embodiment of the invention can construct the association model of the vehicle body structure evaluation index and the occupant injury evaluation index, so that the relationship between the vehicle body structure design and the occupant protection design requirement can be accurately known, and after the association model is constructed, whether the designed vehicle body structure meets the occupant protection design requirement can be predicted by using the association model, so that the design of the vehicle body structure can be optimized rapidly, and the development period of the vehicle collision safety is shortened.
Referring to fig. 11, fig. 11 is a schematic structural view of an apparatus for constructing a correlation model of 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 the above-described embodiments of the method of constructing the association model of the vehicle body structure and the occupant injury evaluation, such as step S1 shown in fig. 1. Or the processor 21, when executing the computer program, performs the functions of the modules/units of the device embodiments described above, such as the parameter acquisition module 11.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory 22 and executed by the processor 21 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program in the apparatus 20 for constructing a model of association of a vehicle body structure with an 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 the specific functions of each module refer to the working process of the apparatus 10 for constructing a correlation model for evaluating a vehicle body structure and an occupant injury described in the above-mentioned second embodiment, which is not described herein.
The device 20 for constructing the association model of the vehicle body structure and the occupant injury evaluation may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The device 20 for constructing the association model of the vehicle body structure and the occupant injury evaluation may include, but is not limited to, a processor 21, a memory 22. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of the apparatus 20 for constructing the association model of the vehicle body structure and the occupant injury evaluation, and does not constitute a limitation of the apparatus 20 for constructing the association model of the vehicle body structure and the occupant injury evaluation, and may include more or less components than those illustrated, or may combine some components, or different components, for example, the apparatus 20 for constructing the association model of the vehicle body structure and the occupant injury evaluation may further include an input-output apparatus, a network access apparatus, a bus, and the like.
The Processor 21 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 21 is a control center of the apparatus 20 for constructing an association model of a vehicle body structure and an occupant injury evaluation, and connects the respective parts of the apparatus 20 for constructing an association model of a vehicle body structure and an occupant injury evaluation using various interfaces and lines.
The memory 22 may be used to store the computer program and/or module, and the processor 21 may implement the various functions of the apparatus 20 for constructing the association model of vehicle body structure and occupant injury assessment by running or executing the computer program and/or module stored in the memory 22 and invoking data stored in the memory 22. The memory 22 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), secure Digital (SD) card, flash memory card (FLASH CARD), at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the module/unit integrated with the apparatus 20 for constructing an association model of vehicle body structure and occupant injury evaluation may be stored in a computer-readable storage medium if implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the method embodiments described above when executed by the processor 21. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (9)
1. A method of constructing a model of association of a vehicle body structure with an occupant injury assessment, comprising:
Acquiring parameters of a preset vehicle body structure evaluation index;
Obtaining model input quantity according to the parameters of the vehicle body structure evaluation index, and inputting the model input quantity into a preset finite element occupant restraint system model to obtain the parameters of the corresponding occupant injury evaluation index through simulation calculation;
According to the obtained parameters of the vehicle body structure evaluation index and the parameters of the passenger damage evaluation index corresponding to the parameters, the relevance between the vehicle body structure evaluation index and the passenger damage evaluation index is analyzed;
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;
the vehicle body structure evaluation index comprises first-order acceleration and fire wall intrusion, and a correlation model of the vehicle body structure evaluation index and the passenger injury evaluation index meets the following formula:
D Target object ＝D Mark for marking +ΔG1*2.0+ΔD2b*1.0
Wherein D Mark for marking is a safety threshold of a preset occupant injury evaluation index; d Target object is an occupant injury evaluation value of the target; Δg 1 is the amount of change in the first-order acceleration; Δd 2b is the variation of the intrusion of the firewall.
2. The method of constructing a model of association of a vehicle body structure with occupant injury assessment according to claim 1, wherein said vehicle body structure is a vehicle front end structure including a rigid barrier, a firewall, and an engine disposed between said rigid barrier and said firewall.
3. The method of constructing a model relating a vehicle body structure to occupant injury evaluation according to claim 2, wherein the first-order acceleration is an acceleration generated in a first-order deformation zone when the vehicle body structure collides with the front; the first order deformation zone includes an area between the rigid barrier and the engine and an area between the engine and the firewall;
the firewall intrusion amount is an amount by which the firewall is deformed and displaced rearward when the vehicle body structure collides with the front face.
4. The method of constructing a correlation model of a vehicle body structure and occupant injury evaluation according to claim 3, wherein the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the fire wall intrusion amount is kept unchanged, the relation between the occupant injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relation between the occupant injury evaluation index and the firewall intrusion amount is inversely related.
5. The method of constructing a model relating a vehicle body structure to occupant injury assessment according to any one of claims 1 to 4, wherein the occupant injury assessment index includes at least one of a chest injury value, a head injury value, and a leg injury value.
6. An apparatus for constructing a model relating a vehicle body structure to an occupant injury evaluation, comprising:
The parameter acquisition module is used for acquiring parameters of a preset vehicle body structure evaluation index;
the model input quantity acquisition module is used for acquiring the model input quantity according to the parameters of the vehicle body structure evaluation index;
the simulation calculation module is used for inputting 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;
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 parameters of the passenger damage evaluation index corresponding to the parameters;
the association model building module is used for building an association model of the vehicle body structure evaluation index and the occupant injury evaluation index according to the association between the vehicle body structure evaluation index and the occupant injury evaluation index obtained through analysis;
the vehicle body structure evaluation index comprises first-order acceleration and fire wall intrusion, and a correlation model of the vehicle body structure evaluation index and the passenger injury evaluation index meets the following formula:
D Target object ＝D Mark for marking +ΔG1*2.0+ΔD2b*1.0
Wherein D Mark for marking is a safety threshold of a preset occupant injury evaluation index; d Target object is an occupant injury evaluation value of the target; Δg 1 is the amount of change in the first-order acceleration; Δd 2b is the variation of the intrusion of the firewall.
7. The apparatus for constructing a model relating a vehicle body structure to occupant injury evaluation according to claim 6, wherein the vehicle body structure is a vehicle front end structure including a rigid barrier, a firewall, and an engine provided between the rigid barrier and the firewall;
The first-order acceleration is acceleration generated by a first-order deformation area when the vehicle body structure collides with the front surface; the first order deformation zone includes an area between the rigid barrier and the engine and an area between the engine and the firewall;
the firewall intrusion amount is an amount by which the firewall is deformed and displaced rearward when the vehicle body structure collides with the front face.
8. The apparatus for constructing a correlation model of a vehicle body structure and occupant injury evaluation according to claim 7, wherein the correlation between the vehicle body structure evaluation index and the occupant injury evaluation index satisfies:
when the fire wall intrusion amount is kept unchanged, the relation between the occupant injury evaluation index and the first-order acceleration index is in negative correlation;
when the first-order acceleration is kept unchanged, the relation between the occupant injury evaluation index and the firewall intrusion amount is inversely related.
9. An apparatus for constructing a model of association of a vehicle body structure with an occupant injury assessment, characterized by comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the method of constructing a model of association of a vehicle body structure with an occupant injury assessment according to any one of claims 1 to 5 when the computer program is executed.
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