CN111027131A - Target torsional rigidity determination method and device - Google Patents
Target torsional rigidity determination method and device Download PDFInfo
- Publication number
- CN111027131A CN111027131A CN201811168289.2A CN201811168289A CN111027131A CN 111027131 A CN111027131 A CN 111027131A CN 201811168289 A CN201811168289 A CN 201811168289A CN 111027131 A CN111027131 A CN 111027131A
- Authority
- CN
- China
- Prior art keywords
- torsional rigidity
- vehicle body
- target
- vehicle
- lower vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Body Structure For Vehicles (AREA)
Abstract
The embodiment of the application discloses a method and a device for determining target torsional rigidity. Because the pre-constructed relation model can be used for describing the relation between the torsional rigidity of the automobile body and the torsional rigidity of the lower automobile body system, the target torsional rigidity of the lower automobile body system and the target torsional rigidity of the lower automobile body framework can be directly evaluated according to the target torsional rigidity of the target automobile body and the pre-constructed relation model, the problem of the hysteresis of the research and development of the lower automobile body is solved, the research and development time of the automobile is reduced, and the manufacturing cost of the automobile is reduced.
Description
Technical Field
The application relates to the field of automobiles, in particular to a method and a device for determining target torsional rigidity.
Background
As the foundation for developing various vehicle types at the same level, the automobile body framework increasingly becomes the core technology concerned by automobile enterprises, and how to rapidly build the automobile body framework becomes the key point of the automobile enterprises at home and abroad at present. In the development stage of the automobile body framework, the torsional rigidity of the automobile body is an important performance index, and has important significance on the stability, the comfort, the structural durability and the like of the automobile.
The torsional rigidity of the automobile body is used for representing the deformation resistance of relevant parts of the automobile and is generally expressed by the proportion of force and deformation displacement. The vehicle body consists of an upper vehicle body and a lower vehicle body, so that the lower vehicle body framework has great influence on the torsional rigidity of the vehicle body.
In the vehicle body architecture development stage, the current method adjusts the structure of the lower vehicle body according to the target torsional rigidity of a plurality of vehicle bodies of a plurality of vehicle types, so that the torsional rigidity of the plurality of vehicle bodies of the plurality of vehicle types conforms to the target torsional rigidity.
In a specific implementation, a plurality of complete upper body data or upper body conceptual models of a plurality of vehicle types are generally required to evaluate and adjust the structure of the lower body framework according to a plurality of body target torsional rigidities. The structure evaluation and optimization method of the lower vehicle body framework usually depends on the upper vehicle body structures of a plurality of vehicle bodies, so that the analysis and optimization of the lower vehicle body framework have hysteresis in the vehicle development process, and the vehicle development efficiency is low.
Disclosure of Invention
In order to solve the problem of hysteresis of lower vehicle body development in the prior art, the embodiment of the application provides a method and a device for determining a target torsional rigidity.
The embodiment of the application provides a target torsional rigidity determining method, which is characterized in that a relation model for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle system is constructed in advance; wherein the body includes the lower body system; the method comprises the following steps:
and determining the target torsional rigidity of the lower vehicle body system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the pre-constructed relation model.
Optionally, the pre-building a relationship model for describing a relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system includes:
constructing a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system according to the proportion of the torsional rigidity of the closed thin-walled tube and the torsional rigidity of the open thin-walled tube; the open thin-walled tube comprises two parts formed by cutting the closed thin-walled tube along the axial direction.
Optionally, the pre-building a relationship model for describing a relationship between the torsional rigidity of the building vehicle body and the torsional rigidity of the lower vehicle body system includes:
the method comprises the steps of obtaining the torsional rigidity of a plurality of lower vehicle systems and the torsional rigidity of a vehicle body corresponding to the lower vehicle systems;
and fitting the torsional rigidity of the lower vehicle body systems and the torsional rigidity of the vehicle body corresponding to the lower vehicle body systems to obtain a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body systems.
Optionally, the pre-building a relationship model for describing a relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system includes:
pre-constructing a relation model which corresponds to a plurality of vehicle types and is used for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle system;
the determining the target torsional rigidity of the lower vehicle body system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the pre-constructed relation model comprises the following steps:
determining target torsional rigidity of a lower vehicle body system of a plurality of target vehicle bodies according to the target torsional rigidity of the target vehicle bodies of the plurality of vehicle types and the relation models corresponding to the plurality of vehicle types;
and determining the target torsional rigidity of the lower vehicle body framework according to the target torsional rigidity of the lower vehicle body system of the plurality of target vehicle bodies.
Optionally, the coefficient of the relationship model, the vehicle type correction coefficient corresponding to the vehicle type corresponding to the relationship model, and the ratio of the torsional rigidity of the upper vehicle body of the vehicle type corresponding to the relationship model to the torsional rigidity of the lower vehicle body system corresponding to the upper vehicle body are related.
Optionally, the lower vehicle system includes:
the auxiliary frame and the instrument board cross beam are respectively and hard-linked with the lower vehicle body.
Optionally, the lower vehicle system further includes:
at least one of an upper longitudinal beam outer plate, an A-pillar outer plate, a threshold outer plate and a wheel cover outer plate.
The embodiment of the application provides a device for determining target torsional rigidity, which comprises:
a relational model construction unit for constructing in advance a relational model for describing a relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system; wherein the body includes the lower body system;
and the target torsional rigidity determining unit is used for determining the target torsional rigidity of the lower vehicle system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the pre-constructed relation model.
Optionally, the relationship model building unit is specifically configured to:
constructing a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system according to the proportion of the torsional rigidity of the closed thin-walled tube and the torsional rigidity of the open thin-walled tube; the open thin-walled tube comprises two parts formed by cutting the closed thin-walled tube along the axial direction.
Optionally, the relationship model building unit includes:
the system comprises a sample acquisition unit, a data acquisition unit and a data processing unit, wherein the sample acquisition unit is used for acquiring the torsional rigidity of a plurality of lower vehicle systems and the torsional rigidity of a vehicle body corresponding to the lower vehicle systems;
and the relationship model construction subunit is used for fitting the torsional rigidity of the lower vehicle body systems and the torsional rigidity of the vehicle body corresponding to the lower vehicle body systems to obtain a relationship model for describing the relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body systems.
Optionally, the relationship model building unit is specifically configured to: pre-constructing a relation model which corresponds to a plurality of vehicle types and is used for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle system;
the torsion strength unit is specifically configured to: determining target torsional rigidity of a lower vehicle body system of a plurality of target vehicle bodies according to the target torsional rigidity of the target vehicle bodies of the plurality of vehicle types and the relation models corresponding to the plurality of vehicle types; and determining the target torsional rigidity of the lower vehicle body framework according to the target torsional rigidity of the lower vehicle body system of the plurality of target vehicle bodies.
Optionally, the coefficient of the relationship model, the vehicle type correction coefficient corresponding to the vehicle type corresponding to the relationship model, and the ratio of the torsional rigidity of the upper vehicle body of the vehicle type corresponding to the relationship model to the torsional rigidity of the lower vehicle body system of the vehicle type corresponding to the upper vehicle body are related.
Optionally, the lower vehicle system includes:
the auxiliary frame and the instrument board cross beam are respectively and hard-linked with the lower vehicle body.
Optionally, the lower vehicle system further includes:
at least one of an upper longitudinal beam outer plate, an A-pillar outer plate, a threshold outer plate and a wheel cover outer plate.
According to the method and the device for determining the target torsional rigidity, a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system is constructed in advance, wherein the vehicle body comprises the lower vehicle body system, and the target torsional rigidity of the lower vehicle body system of the target vehicle body is determined according to the target torsional rigidity of the target vehicle body, the volume of the target vehicle body, the weight of the target vehicle body and the relation model constructed in advance. Because the pre-constructed relation model can be used for describing the relation between the torsional rigidity of the automobile body and the torsional rigidity of the lower automobile body system, the target torsional rigidity of the lower automobile body system and the target torsional rigidity of the lower automobile body framework can be directly evaluated according to the target torsional rigidity of the target automobile body and the pre-constructed relation model, the problem of the hysteresis of the research and development of the lower automobile body is solved, the research and development time of the automobile is reduced, and the manufacturing cost of the automobile is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a target torsional rigidity determining method provided in an embodiment of the present application;
FIG. 2 is a schematic view of a lower vehicle system according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a thin walled tube according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a vehicle body provided in an embodiment of the present application;
fig. 5 is a schematic view of an axle pitch bandwidth strategy provided in an embodiment of the present application;
fig. 6 is a block diagram of a target torsional rigidity determination apparatus according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
In the prior art, the structure of the lower vehicle body is evaluated and optimized, which usually needs a plurality of complete upper vehicle body data or upper vehicle body conceptual models of a plurality of vehicle types, for example, the structure of the lower vehicle body framework can be evaluated and adjusted according to the upper vehicle body data represented by Computer Aided Design (CAD) or according to the upper vehicle body simple model represented by Computer Aided Engineering (CAE) in combination with the target torsional rigidity of a plurality of vehicle bodies.
Meanwhile, once the structure of the upper vehicle body is changed, the structure of the lower vehicle body is required to be combined to evaluate the torsional rigidity of the vehicle body, and the structure of the lower vehicle body is usually adjusted correspondingly to meet the target torsional rigidity of the vehicle body, so that the data freezing time of the lower vehicle body is longer, the analysis and optimization of the framework of the lower vehicle body have hysteresis in the automobile development process, and the automobile development efficiency is influenced.
In order to solve the above technical problem, an embodiment of the present application provides a target torsional rigidity determining method, in which a relationship model for describing a relationship between a torsional rigidity of a vehicle body and a torsional rigidity of a lower vehicle body system is pre-constructed, where the vehicle body includes the lower vehicle body system, and the target torsional rigidity of the lower vehicle body system of the target vehicle body is determined according to the target torsional rigidity of the target vehicle body and the pre-constructed relationship model. Because the pre-constructed relation model can be used for describing the relation between the torsional rigidity of the automobile body and the torsional rigidity of the lower automobile body system, the target torsional rigidity of the lower automobile body system and the target torsional rigidity of the lower automobile body framework can be directly evaluated according to the target torsional rigidity of the target automobile body and the pre-constructed relation model, the problem of the hysteresis of the research and development of the lower automobile body is solved, the research and development time of the automobile is reduced, and the manufacturing cost of the automobile is reduced.
Referring to fig. 1, a flowchart of a method for determining a target torsional rigidity according to an embodiment of the present application is shown, and the method includes the following steps.
S101, a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system is established in advance.
In the embodiment of the application, the vehicle body can be composed of a lower vehicle body system and an upper vehicle body. In order to make the structure of the lower vehicle system more uniform, as shown in fig. 2, the lower vehicle system may include a lower vehicle body, a subframe 101, and an instrument panel cross member 102, wherein the subframe 101 and the instrument panel cross member 102 are respectively hard-coupled to the lower vehicle body. Optionally, in order to further improve the structural balance of the lower vehicle body system, the lower vehicle body system may further include: at least one of an upper side member outer panel 103, an a-pillar outer panel 104, a rocker outer panel 105, and a wheel house outer panel 106.
In the embodiment of the application, the torsional rigidity of the lower vehicle body system based on the structural balance and the torsional rigidity of the vehicle body of the lower vehicle body system based on the structural balance can be similar to the calculation mode of the torsional rigidity of the open thin-walled tube and the torsional rigidity of the closed thin-walled tube.
Specifically, referring to fig. 3, fig. 3(a) is a schematic view of a closed thin-walled tube, in which the torsional rigidity GD of the closed thin-walled tube is calculated according to the torsional rigidity calculation method of the material mechanicscloseCan be expressed by the following formula:
wherein G is1Elastic model of material, s, for closed-end thin-walled tubes1Is the length of a circular cross-section, delta1Is the thickness of the cross section, L1Length of closed, thin-walled tube, A1Is the area of the cross section.
FIG. 3(b) is a schematic view of an open thin-walled tube, wherein the open thin-walled tube is a two-part thin-walled tube formed by axially cutting a closed thin-walled tube, and the torsional rigidity GD of the open thin-walled tube is calculated according to the torsional rigidity of material mechanicsopenCan be expressed by the following formula:
wherein G is2Elastic model of material, s, for open thin-walled tubes2Is the length of the cross section, delta2Is the thickness of the cross section, L2Is a closed openingLength of thin walled tube.
Because the material elastic models, the lengths of the sections, the thicknesses and the lengths of the sections of the open thin-walled tube and the closed thin-walled tube are the same, the ratio of the torsional rigidity of the closed thin-walled tube to the torsional rigidity of the open thin-walled tube can be obtained:
in analogy to the closed thin-walled tube and the open thin-walled tube, referring to fig. 4, the vehicle body in fig. 4(a) may be constituted by the lower vehicle body system and the upper vehicle body in fig. 4 (b). Referring to the ratio of the torsional rigidity of the closed thin-walled tube to the torsional rigidity of the open thin-walled tube as in equation (3), the ratio of the torsional rigidity of the closed vehicle body to the torsional rigidity of the open vehicle body can be expressed as:
wherein, KcloseFor closure of the torsional rigidity of the vehicle body, KopenIn the case of the torsional rigidity of the unclosed vehicle body, s is the cross-sectional circumferential length in the front-rear direction of the vehicle body, δ is the thickness of the vehicle body, L is the length of the vehicle body, and a is the cross-sectional area in the front-rear direction of the vehicle body. And K isopen＝Kup+KunderAnd j is a correction coefficient. Then the following can be derived from equation (4):
wherein J ═ J ρ2And defining as a vehicle model correction coefficient, rho is the density of the vehicle body material, D is the length of the vehicle body, V is the volume of the vehicle body, and M is the weight of the vehicle body.
Let KupAnd KunderHas a proportionality coefficient of mu, then Kup＝μ*KunderThen, then
According to the formula (1):
in the early stage of automobile development, V/M is a known constant according to a determined automobile model and a determined mass target, and therefore, it can be known that a coefficient c and a model correction coefficient J of a relational model are positively correlated with a ratio μ of the torsional rigidity of an upper vehicle body to the torsional rigidity of a lower vehicle body system.
In the embodiment of the application, n vehicle bodies of a certain vehicle type can be obtained as samples, the n vehicle bodies can be in the same grade or different grades, and the torsional rigidity K of the vehicle body of the ith vehicle body is obtained through statisticsicloseVolume V of ith vehicle bodyiMass M of ith vehicle bodyiTorsional rigidity K of upper vehicle bodyiupAnd corresponding torsional rigidity K of lower vehicle systemiunderAnd calculating the ratio c of the torsional rigidity of the ith vehicle body to the corresponding torsional rigidity of the lower vehicle body systemi＝Kiclose/Kiunder. Ratio of torsional rigidity of upper vehicle body to torsional rigidity of lower vehicle body system
Vehicle type correction factor
Corresponding to different vehicle types, different vehicle type correction coefficients J and the ratio mu of the torsional rigidity of the upper vehicle body to the torsional rigidity of the lower vehicle body system can be provided, and the vehicle type correction coefficients of the two-compartment car, the three-compartment car, the sports car and the multipurpose car are respectively recorded as Jhb、Jnb、JsAnd JmThe ratio of the torsional rigidity of the upper vehicle body to the torsional rigidity of the lower vehicle body system is denoted as μhb、μnb、μsAnd mumThen, by obtaining body samples of a two-compartment car, a three-compartment car, a sport car and a multipurpose car, the corresponding relationship model can be obtained as follows,
wherein, Khbclose、Knbclose、KscloseAnd KmcloseTorsional rigidity, V, of bodies of cars, two-box cars, three-box cars, sports cars and multi-purpose cars, respectivelyhb、Vnb、VsAnd VmThe volume of the body, M, of a two-compartment car, a three-compartment car, a sport car and a multipurpose car, respectivelyhb、Mnb、MsAnd MmThe mass of the body, K, of a two-compartment car, a three-compartment car, a sport car and a utility car, respectivelyhbunder、Knbunder、KsunderAnd KmunderThe torsional rigidity of the lower body system of a hatchback car, a sedan car, a sports car and a multipurpose car respectively.
Specifically, the model correction coefficients of the hatchback, the sedan, the sport car and the multipurpose car are respectively recorded as Jhb、Jnb、JsAnd Jm19000, 22000, 18000 and 17000, respectively, and the ratio of the torsional rigidity of the upper vehicle body to the torsional rigidity of the lower vehicle body system is denoted as μhb、μnb、μsAnd mum1.2, 1.5, 1 and 1.3 respectively.
S102, determining the target torsional rigidity of the lower vehicle body framework of the target vehicle body according to the target torsional rigidity of the target vehicle body and a pre-constructed relation model.
The target torsional rigidity, the vehicle body volume and the vehicle body mass target of the target vehicle body are set according to actual requirements in the early development stage of the automobile, and the target torsional rigidity of the target vehicle body is substituted into a pre-constructed relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system, so that the target torsional rigidity of the lower vehicle system of the target vehicle body can be determined.
Specifically, the target torsional rigidity of the lower body system of each vehicle type can be obtained according to the target torsional rigidity of the target vehicle body and a relation model for describing a relation between the torsional rigidity of the target vehicle body and the torsional rigidity of the lower body system, wherein the unit of the torsional rigidity is newton-meter-revolution (Nm/rad), and the following table is referred to.
TABLE 1 torsional rigidity of target vehicle body and torsional rigidity of lower vehicle body
In addition, different models of automobiles with the same lower body framework can have different upper bodies, the time difference between the different models of automobiles on the market is large, the structure of the lower body framework needs to be further optimized and adjusted continuously according to the target torsional rigidity of the automobile body of the subsequent model, the sharing rate of the lower body framework is low, and the manufacturing cost of the automobiles is increased.
In order to improve the sharing rate of the lower vehicle body architecture, in the embodiment of the application, one lower vehicle body can be used as a main body for architecture development, and the lower vehicle body can be adjusted according to the wheelbase bandwidth strategy of other vehicle types. As a possible implementation manner, the lower body of the class a three-compartment vehicle may be used as a main body of the architecture development, and the lower body of the class a three-compartment vehicle is respectively lengthened according to the wheelbase bandwidth strategies of the class B three-compartment vehicle, the compact sport utility vehicle SUV, the medium sport utility vehicle SUV and the multi-purpose car MPV. Referring to fig. 5, the wheel base bandwidth strategy includes a front wheel center to front H point lengthening strategy L1 and a front H point to rear wheel center lengthening strategy L2. The torsional rigidity of the lower body after being stretched is obtained by respectively reducing the torsional rigidity of the lower body system of the A-class three-compartment car before being stretched by the proportion
And
specifically, take the embodiment as an example
That is, if the target torsional rigidity of the lower vehicle body system of the elongated B-stage three-compartment vehicle is KnbunderThe torsional rigidity of the lower body system of the class-A three-compartment vehicle as the framework development subject before elongation is at least
Accordingly, if the target torsional rigidity of the lower body system of the elongated compact sports type automobile SUV is KsaunderThe torsional rigidity of the lower body system of the class-A three-compartment vehicle as the framework development subject before elongation is at least
If the target torsional rigidity of the lower body system of the elongated SUV of the medium-sized sports vehicle is KsbunderThe torsional rigidity of the lower body system of the class-A three-compartment vehicle as the framework development subject before elongation is at least
If the target torsional rigidity of the lower body system which is elongated and is used for the MPV of the car is KmcunderThe torsional rigidity of the lower body system of the class-A three-compartment vehicle as the framework development subject before elongation is at least
On the basis, in order to enable the structure of the lower vehicle system of the A-level three-compartment vehicle to be suitable for various vehicle types, the lower vehicle system of the A-level three-compartment vehicle can meet the lower vehicle torsional rigidity corresponding to other various vehicle types, and therefore the target torsional rigidity of the lower vehicle framework can be determined according to the determined target torsional rigidity of the lower vehicle system of the target vehicle bodies of a plurality of different vehicle types. The target torsional stiffness of the lower body frame may be Knbunder、
And
maximum value of (1), i.e
According to the torsional rigidity values of the lower body system in table 1, it can be known that when the structure of the lower body system of the class a three-compartment vehicle is taken as a main body, the target torsional rigidity of the lower body frame is as follows:
Karc＝Max(2600，2400/(1-10％)，2740/(1-7.5％)，3140/(1-10％)，2400/(1-15％))＝Max(2600，2667，2962，3489，2823)＝3489(Nm/rad)。
according to the target torsional rigidity determining method provided by the embodiment of the application, a relation model for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle body system is constructed in advance, wherein the vehicle body comprises the lower vehicle body system, and the target torsional rigidity of the lower vehicle body system of the target vehicle body is determined according to the target torsional rigidity of the target vehicle body and the relation model constructed in advance. Because the pre-constructed relation model can be used for describing the relation between the torsional rigidity of the automobile body and the torsional rigidity of the lower automobile body system, the target torsional rigidity of the lower automobile body system and the target torsional rigidity of the lower automobile body framework can be directly evaluated according to the target torsional rigidity of the target automobile body and the pre-constructed relation model, the problem of the hysteresis of the research and development of the lower automobile body is solved, the research and development time of the automobile is reduced, the sharing rate of the lower automobile body framework is improved, and the manufacturing cost of the automobile is reduced.
Based on the method for determining the target torsional rigidity provided by the above embodiment, the embodiment of the application also provides a device for determining the target torsional rigidity, and the working principle of the device is described in detail below with reference to the accompanying drawings.
Referring to fig. 6, this is a block diagram of a target torsional rigidity determining apparatus provided in an embodiment of the present application, where the apparatus includes:
a relational model construction unit 110 for constructing in advance a relational model for describing a relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system; wherein the body includes the lower body system;
and a target torsional rigidity determining unit 120, configured to determine a target torsional rigidity of the lower vehicle system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the relationship model that is constructed in advance.
Optionally, the relationship model building unit is specifically configured to:
constructing a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system according to the proportion of the torsional rigidity of the closed thin-walled tube and the torsional rigidity of the open thin-walled tube; the open thin-walled tube comprises two parts formed by cutting the closed thin-walled tube along the axial direction.
Optionally, the relationship model building unit includes:
the system comprises a sample acquisition unit, a data acquisition unit and a data processing unit, wherein the sample acquisition unit is used for acquiring the torsional rigidity of a plurality of lower vehicle systems and the torsional rigidity of a vehicle body corresponding to the lower vehicle systems;
and the relationship model construction subunit is used for fitting the torsional rigidity of the lower vehicle body systems and the torsional rigidity of the vehicle body corresponding to the lower vehicle body systems to obtain a relationship model for describing the relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body systems.
Optionally, the relationship model building unit is specifically configured to: pre-constructing a relation model which corresponds to a plurality of vehicle types and is used for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle system;
the torsion strength unit is specifically configured to: determining target torsional rigidity of a lower vehicle body system of a plurality of target vehicle bodies according to the target torsional rigidity of the target vehicle bodies of the plurality of vehicle types and the relation models corresponding to the plurality of vehicle types; and determining the target torsional rigidity of the lower vehicle body framework according to the target torsional rigidity of the lower vehicle body system of the plurality of target vehicle bodies.
Optionally, the coefficient of the relationship model, the vehicle type correction coefficient corresponding to the vehicle type corresponding to the relationship model, and the ratio of the torsional rigidity of the upper vehicle body of the vehicle type corresponding to the relationship model to the torsional rigidity of the lower vehicle body system corresponding to the upper vehicle body are related.
Optionally, the lower vehicle system includes:
the auxiliary frame and the instrument board cross beam are respectively and hard-linked with the lower vehicle body.
Optionally, the lower vehicle system further includes:
at least one of an upper longitudinal beam outer plate, an A-pillar outer plate, a threshold outer plate and a wheel cover outer plate.
The target torsional rigidity determining device provided by the embodiment of the application determines the target torsional rigidity of the lower vehicle body system of the target vehicle body according to the target torsional rigidity of the target vehicle body, the volume of the target vehicle body, the weight of the target vehicle body and the pre-constructed relation model by pre-constructing the relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system, wherein the vehicle body comprises the lower vehicle body system. Because the pre-constructed relation model can be used for describing the relation between the torsional rigidity of the automobile body and the torsional rigidity of the lower automobile body system, the target torsional rigidity of the lower automobile body system and the target torsional rigidity of the lower automobile body framework can be directly evaluated according to the target torsional rigidity of the target automobile body and the pre-constructed relation model, the problem of the hysteresis of the research and development of the lower automobile body is solved, the research and development time of the automobile is reduced, the sharing rate of the lower automobile body framework is improved, and the manufacturing cost of the automobile is reduced.
When introducing elements of various embodiments of the present application, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
It should be noted that, as one of ordinary skill in the art would understand, all or part of the processes of the above method embodiments 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 when executed, the computer program may include the processes of the above method embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (11)
1. A target torsional rigidity determining method is characterized in that a relationship model for describing a relationship between torsional rigidity of a vehicle body and torsional rigidity of a lower vehicle body system is constructed in advance; wherein the body includes the lower body system; the method comprises the following steps:
and determining the target torsional rigidity of the lower vehicle body system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the pre-constructed relation model.
2. The method of claim 1, wherein the pre-constructing a relationship model describing a relationship between a torsional stiffness of a vehicle body and a torsional stiffness of an under-vehicle system comprises:
constructing a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system according to the proportion of the torsional rigidity of the closed thin-walled tube and the torsional rigidity of the open thin-walled tube; the open thin-walled tube comprises two parts formed by cutting the closed thin-walled tube along the axial direction.
3. The method according to claim 1 or 2, wherein the previously constructing a relationship model for describing a relationship between the torsional rigidity of the build body and the torsional rigidity of the lower vehicle body system includes:
the method comprises the steps of obtaining the torsional rigidity of a plurality of lower vehicle systems and the torsional rigidity of a vehicle body corresponding to the lower vehicle systems;
and fitting the torsional rigidity of the lower vehicle body systems and the torsional rigidity of the vehicle body corresponding to the lower vehicle body systems to obtain a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body systems.
4. The method of claim 1, wherein the pre-constructing a relationship model describing a relationship between a torsional stiffness of a vehicle body and a torsional stiffness of an under-vehicle system comprises:
pre-constructing a relation model which corresponds to a plurality of vehicle types and is used for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle system;
the determining the target torsional rigidity of the lower vehicle body system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the pre-constructed relation model comprises the following steps:
determining target torsional rigidity of a lower vehicle body system of a plurality of target vehicle bodies according to the target torsional rigidity of the target vehicle bodies of the plurality of vehicle types and the relation models corresponding to the plurality of vehicle types;
and determining the target torsional rigidity of the lower vehicle body framework according to the target torsional rigidity of the lower vehicle body system of the plurality of target vehicle bodies.
5. The method of claim 4, wherein the coefficients of the relational model are related to model correction coefficients of the relational model, and a ratio of a torsional stiffness of an upper body of a model corresponding to the relational model to a torsional stiffness of a lower body system corresponding to the upper body.
6. The method of claim 1, wherein the lower vehicle system comprises:
the auxiliary frame and the instrument board cross beam are respectively and hard-linked with the lower vehicle body.
7. The method of claim 6, wherein the lower vehicle system further comprises:
at least one of an upper longitudinal beam outer plate, an A-pillar outer plate, a threshold outer plate and a wheel cover outer plate.
8. An apparatus for determining torsional rigidity of a lower vehicle body, the apparatus comprising:
a relational model construction unit for constructing in advance a relational model for describing a relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body system; wherein the body includes the lower body system;
and the target torsional rigidity determining unit is used for determining the target torsional rigidity of the lower vehicle system of the target vehicle body according to the target torsional rigidity of the target vehicle body and the pre-constructed relation model.
9. The apparatus according to claim 8, wherein the relational model construction unit is specifically configured to:
constructing a relation model for describing the relation between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle system according to the proportion of the torsional rigidity of the closed thin-walled tube and the torsional rigidity of the open thin-walled tube; the open thin-walled tube comprises two parts formed by cutting the closed thin-walled tube along the axial direction.
10. The apparatus according to claim 8 or 9, wherein the relational model construction unit comprises:
the system comprises a sample acquisition unit, a data acquisition unit and a data processing unit, wherein the sample acquisition unit is used for acquiring the torsional rigidity of a plurality of lower vehicle systems and the torsional rigidity of a vehicle body corresponding to the lower vehicle systems;
and the relationship model construction subunit is used for fitting the torsional rigidity of the lower vehicle body systems and the torsional rigidity of the vehicle body corresponding to the lower vehicle body systems to obtain a relationship model for describing the relationship between the torsional rigidity of the vehicle body and the torsional rigidity of the lower vehicle body systems.
11. The apparatus according to claim 8, wherein the relational model construction unit is specifically configured to: pre-constructing a relation model which corresponds to a plurality of vehicle types and is used for describing the relation between the torsional rigidity of a vehicle body and the torsional rigidity of a lower vehicle system;
the torsion strength unit is specifically configured to: determining target torsional rigidity of a lower vehicle body system of a plurality of target vehicle bodies according to the target torsional rigidity of the target vehicle bodies of the plurality of vehicle types and the relation models corresponding to the plurality of vehicle types; and determining the target torsional rigidity of the lower vehicle body framework according to the target torsional rigidity of the lower vehicle body system of the plurality of target vehicle bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168289.2A CN111027131B (en) | 2018-10-08 | 2018-10-08 | Method and device for determining target torsional rigidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168289.2A CN111027131B (en) | 2018-10-08 | 2018-10-08 | Method and device for determining target torsional rigidity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111027131A true CN111027131A (en) | 2020-04-17 |
| CN111027131B CN111027131B (en) | 2023-09-15 |
Family
ID=70190374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811168289.2A Active CN111027131B (en) | 2018-10-08 | 2018-10-08 | Method and device for determining target torsional rigidity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111027131B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104573174A (en) * | 2014-11-20 | 2015-04-29 | 华晨汽车集团控股有限公司 | CAE (computer aided engineering)-based car body rigidity analysis method |
| WO2017056627A1 (en) * | 2015-09-28 | 2017-04-06 | Ｊｆｅスチール株式会社 | Vehicle body stiffness analysis method |
| CN106844970A (en) * | 2017-01-23 | 2017-06-13 | 吉林大学 | A kind of body structure torsional rigidity computational methods |
| CN106919760A (en) * | 2017-03-06 | 2017-07-04 | 吉林大学 | A kind of body section torsional rigidity distribution character computational methods |
| JP2017161341A (en) * | 2016-03-09 | 2017-09-14 | Ｊｆｅスチール株式会社 | Device and method for testing automobile body rigidity |
-
2018
- 2018-10-08 CN CN201811168289.2A patent/CN111027131B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104573174A (en) * | 2014-11-20 | 2015-04-29 | 华晨汽车集团控股有限公司 | CAE (computer aided engineering)-based car body rigidity analysis method |
| WO2017056627A1 (en) * | 2015-09-28 | 2017-04-06 | Ｊｆｅスチール株式会社 | Vehicle body stiffness analysis method |
| JP2017161341A (en) * | 2016-03-09 | 2017-09-14 | Ｊｆｅスチール株式会社 | Device and method for testing automobile body rigidity |
| CN106844970A (en) * | 2017-01-23 | 2017-06-13 | 吉林大学 | A kind of body structure torsional rigidity computational methods |
| CN106919760A (en) * | 2017-03-06 | 2017-07-04 | 吉林大学 | A kind of body section torsional rigidity distribution character computational methods |
Non-Patent Citations (3)
| Title |
|---|
| 刘小会;: "纯电动汽车白车身刚度优化设计" * |
| 卢川海;: "白车身平台刚度优化设计" * |
| 黄炎;苏松松;冯明松;: "基于隐式参数化正向建模的车身概念设计方法研究" * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111027131B (en) | 2023-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110588657B (en) | Joint estimation method for vehicle motion state and road gradient | |
| Zhang et al. | Investigation into untripped rollover of light vehicles in the modified fishhook and the sine maneuvers. Part I: Vehicle modelling, roll and yaw instability | |
| Liu et al. | Collaborative optimization of vehicle crashworthiness under frontal impacts based on displacement oriented structure | |
| Georgiou et al. | On the assessment of the macro-element methodology for full vehicle crashworthiness analysis | |
| CN112257189B (en) | Multidisciplinary optimization method for light weight of passenger car framework | |
| CN111027131A (en) | Target torsional rigidity determination method and device | |
| Zahedan et al. | Experimental and numerical investigation on the multi-optimization of reinforcing the side members of the vehicle structure | |
| CN113158514B (en) | Automobile body material structure matching lightweight design method, system and storage medium | |
| Baskin et al. | A case study in structural optimization of an automotive body-in-white design | |
| CN112257188A (en) | Lightweight design method for hybrid power bus framework | |
| Yang et al. | Application of tailor rolled blank in vehicle front end for frontal impact | |
| CN113793074B (en) | Social cooperation evaluation method for automatic driving vehicle | |
| Malen et al. | Estimation of secondary mass changes in vehicle design | |
| Cristello et al. | Multidisciplinary design optimization of a zero-emission vehicle chassis considering crashworthiness and hydroformability | |
| Liang et al. | An FSRW numerical simplification approach for vehicle frontal crashworthiness analysis | |
| Saito et al. | A study of optimization for automotive parts and structures by using inertia relief | |
| CN113239464B (en) | Method and device for determining vehicle body section | |
| CN112926134A (en) | Method for optimizing sliding plate type battery pack of electric vehicle | |
| CN113484037B (en) | Lightweight evaluation method for electric vehicle body | |
| CN117892419A (en) | Truss type all-terrain vehicle body lightweight optimization method | |
| Khan et al. | Pipe profile optimization of formula student chassis for torsional stiffness | |
| Kawachi et al. | Stiffness Increase and Weight Reduction Based on Stiffness Evaluation Techniques | |
| Jabidi et al. | Analysis of The Performance on Wheel Rim Towards Impact Test: Wheel Rim Impact | |
| Yilkiran | Tires and system solutions for the cars of the future | |
| Shibaoka et al. | New approach to high rigidity body construction using dynamic analysis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |