CN112861261A - Vehicle body attachment point dynamic stiffness post-processing method and device and electronic equipment - Google Patents
Vehicle body attachment point dynamic stiffness post-processing method and device and electronic equipment Download PDFInfo
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Abstract
The invention discloses a method and a device for post-processing dynamic stiffness of a vehicle body attachment point and electronic equipment, wherein the method comprises the following steps: numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body; exporting the numbered analysis model; submitting the exported analysis module to a solver for calculation to obtain a calculation result; compiling mvw files, extracting acceleration responses of all the analysis points in three directions from the calculation results, and calculating dynamic stiffness K according to the acceleration responsesa(ii) a The dynamic stiffness K is obtained according to calculationaAnd drawing a dynamic stiffness curve. According to the method and the device for post-processing the dynamic stiffness of the vehicle body attachment point and the electronic equipment, after the calculation is finished, the result file is automatically read, the acceleration response curve and the target function curve are output, the post-processing process is simplified, the post-processing period is greatly saved, and the development and design cycle of the vehicle is favorably shortenedAnd (4) period.
Description
Technical Field
The invention belongs to the technical field of vehicle dynamic stiffness simulation calculation, and particularly relates to a vehicle body attachment point dynamic stiffness post-processing method and device and electronic equipment.
Background
Stiffness refers to the ability of a structure or material to resist deformation. Due to different loads of the structure or the material, static load or dynamic load can be applied, and when the dynamic load is applied, the deformation capability under the resistance to the dynamic load is called dynamic stiffness. IPI (Input Point Inertance, source Point admittance analysis) refers to the measurement of the Input force at a load Point, by applying a single force as Input excitation at the load Point, meanwhile, the point is taken as a response point, the acceleration of the point in the frequency range is measured as an output response, the local dynamic stiffness of the point is considered to be the local dynamic stiffness at the point of attachment to the vehicle body, such as the local dynamic stiffness at the positions of the vehicle body and an engine suspension, a subframe, a suspension connection, an exhaust hook and the like, and the stiffness level of the local area of the point of attachment in the concerned frequency range is considered to be too low, which causes more Noise, so that the performance index has a large influence on the NVH performance of the whole vehicle (NVH is the English abbreviation of Noise, Vibration and Harshness, namely Noise, Vibration and Harshness, which is a comprehensive problem for measuring the manufacturing quality of the vehicle and gives the most direct and surface feeling to the vehicle users). Insufficient dynamic stiffness can have a very adverse effect on the overall ride comfort and fatigue life of the vehicle body structure. By means of a finite element method, the dynamic stiffness can be calculated in the early stage of the project. However, in the analysis process of analyzing the dynamic stiffness of the whole vehicle attachment point by the finite element method, the analysis points are numerous, each analysis point has three directions, and the post-processing process is very complicated.
Disclosure of Invention
In order to solve the problems, the invention provides a vehicle body attachment point dynamic stiffness post-processing method, a device and electronic equipment.
The technical scheme adopted by the invention is as follows: a vehicle body attachment point dynamic stiffness post-processing method comprises the following steps:
numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body;
exporting the numbered analysis model;
submitting the exported analysis module to a solver for calculation to obtain a calculation result;
writing mvw file from the calculation resultThe acceleration response of all the analysis points in three directions is extracted, and the dynamic stiffness K is calculated according to the acceleration responsea；
The dynamic stiffness K is obtained according to calculationaAnd drawing a dynamic stiffness curve.
As an optional technical solution, wherein the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is as follows:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is the acceleration and the circular frequency w is 2 pi f.
As an optional technical solution, the dynamic stiffness K is calculated according to the acceleration responseaThe method comprises the following steps:
obtaining an IPI response curve according to the formula (1);
calculating the area enclosed by the IPI response curve, then:
obtaining the dynamic stiffness K of the attachment pointaThe following were used:
as an optional technical solution, the dynamic stiffness K is calculated according to the acceleration responseaThe method also comprises the following steps: the dynamic stiffness K obtained by calculationaAnd comparing with the dynamic stiffness target value to evaluate the dynamic stiffness level of each attachment point.
The invention also discloses a vehicle body attachment point dynamic stiffness post-processing device, which comprises:
a numbering module for numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body;
the model export module is used for exporting the numbered analysis model;
the model submitting module is used for submitting the exported analysis module to a solver for calculation to obtain a calculation result;
the data exporting and calculating module is used for compiling mvw files, extracting acceleration responses of all the analysis points in three directions from the calculation results, and calculating dynamic stiffness K according to the acceleration responsesa；
A curve drawing module for calculating the dynamic stiffness KaAnd drawing a dynamic stiffness curve.
As an optional technical solution, wherein the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is as follows:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is the acceleration and the circular frequency w is 2 pi f.
As an optional technical solution, the data exporting and calculating module further includes:
an IPI response curve obtaining unit, configured to obtain an IPI response curve according to the formula (1);
an area calculation unit, configured to calculate an area enclosed by the IPI response curve, including:
a dynamic stiffness calculation unit for obtaining the dynamic stiffness K of the attachment point according to the formula (2)aThe following are:
as an optional technical solution, the data exporting and calculating module further includes: a comparison unit for calculating the dynamic stiffness KaAnd comparing with the dynamic stiffness target value to evaluate the dynamic stiffness level of each attachment point.
The invention also discloses an electronic device, comprising: one or more processors; one or more memories; the one or more memories store one or more computer programs comprising instructions that, when executed by the one or more processors, cause the electronic device to perform a body attachment point dynamic stiffness aftertreatment method as described above.
The invention also discloses a computer readable medium, which comprises a computer program, when the computer program runs on a computer, the computer is caused to execute the vehicle body attachment point dynamic stiffness post-processing method.
The invention has the beneficial effects that: according to the method and the device for post-processing the dynamic stiffness of the vehicle body attachment point and the electronic equipment, after calculation is finished, the result file is automatically read, the acceleration response curve and the target function curve are output, the post-processing process is simplified, the post-processing period is greatly saved, and the development and design period of the vehicle is favorably shortened.
Drawings
FIG. 1 is a schematic flow chart of a method for post-processing dynamic stiffness of a vehicle body attachment point in an embodiment.
Fig. 2 is an IPI response curve.
FIG. 3 is a schematic block diagram of a vehicle body attachment point dynamic stiffness aftertreatment device in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is further described with reference to the following figures and specific embodiments.
Examples
As shown in FIG. 1, the post-processing method for the dynamic stiffness of the vehicle body attachment point comprises the following steps:
numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body;
exporting the numbered analysis model;
submitting the exported analysis module to a solver for calculation to obtain a calculation result;
compiling mvw files, extracting acceleration responses of all the analysis points in three directions from the calculation results, and calculating dynamic stiffness K according to the acceleration responsesa；
The dynamic stiffness K is obtained according to calculationaAnd drawing a dynamic stiffness curve.
As an optional technical solution, wherein the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is as follows:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is the acceleration and the circular frequency w is 2 pi f.
As an optional technical solution, the dynamic stiffness K is calculated according to the acceleration responseaComprises the following stepsThe method comprises the following steps:
obtaining an IPI response curve according to the formula (1);
calculating the area enclosed by the IPI response curve, then:
obtaining the dynamic stiffness K of the attachment pointaThe following were used:
as an optional technical solution, the dynamic stiffness K is calculated according to the acceleration responseaThe method also comprises the following steps: the dynamic stiffness K obtained by calculationaAnd comparing with the dynamic stiffness target value to evaluate the dynamic stiffness level of each attachment point.
In the method, after the calculation is finished, the result file is automatically read, and the acceleration response curve (namely the IPI response curve) and the target function curve (namely the dynamic stiffness curve) are output, so that the post-processing process is simplified, the post-processing period is greatly saved, and the development and design period of the automobile is favorably shortened.
The more specific implementation process is as follows:
step 1: numbering analysis points on an analysis model, wherein the analysis model is a geometric model of a vehicle body in CAE analysis pre-processing software Hypermesh, the analysis points are a plurality of attachment points of the vehicle body, the attachment points include but are not limited to a power assembly suspension point, a swing arm attachment point, a shock absorber attachment point, an auxiliary frame attachment point and a torsion beam attachment point, and all the attachment points are numbered in sequence.
Step 2: and exporting the models after the models are numbered.
And step 3: and submitting the exported model to a solver for calculation to obtain a calculation result, wherein the solver comprises but is not limited to an Optistruct solver with CAE analysis pre-processing software Hypermesh.
And 4, step 4: weaving machineMvw file is written, acceleration responses of all the analysis points in three directions are extracted from the calculation result, and dynamic stiffness K is calculated according to the acceleration responsesaThe calculation process is as follows:
the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is as follows:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is acceleration, and the circular frequency w is 2 pi f;
obtaining an IPI response curve according to the formula (1), as shown in FIG. 2, wherein the abscissa in FIG. 2 is frequency and the ordinate is acceleration;
calculating the area enclosed by the IPI response curve, then:
calculating to obtain the dynamic stiffness K of the attachment pointaThe following were used:
and 5: and (4) making a dynamic stiffness curve according to the formula (3), wherein the area enclosed by the curve is equal to the area enclosed by the IPI response curve, and evaluating the dynamic stiffness level of each connecting point by comparing with a dynamic stiffness target value.
As shown in fig. 3, the invention also discloses a vehicle body attachment point dynamic stiffness post-processing device, comprising:
a numbering module for numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body;
the model export module is used for exporting the numbered analysis model;
the model submitting module is used for submitting the exported analysis module to a solver for calculation to obtain a calculation result;
the data exporting and calculating module is used for compiling mvw files, extracting acceleration responses of all the analysis points in three directions from the calculation results, and calculating dynamic stiffness K according to the acceleration responsesa；
A curve drawing module for calculating the dynamic stiffness KaAnd drawing a dynamic stiffness curve.
As an optional technical solution, wherein the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is as follows:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is the acceleration and the circular frequency w is 2 pi f.
As an optional technical solution, the data exporting and calculating module further includes:
an IPI response curve obtaining unit, configured to obtain an IPI response curve according to the formula (1);
an area calculation unit, configured to calculate an area enclosed by the IPI response curve, including:
a dynamic stiffness calculation unit for obtaining the dynamic stiffness K of the attachment point according to the formula (2)aThe following are:
as an optional technical solution, the data exporting and calculating module further includes: a comparison unit for calculating the dynamic stiffness KaAnd comparing with the dynamic stiffness target value to evaluate the dynamic stiffness level of each attachment point.
The invention also discloses an electronic device, comprising: one or more processors; one or more memories; the one or more memories store one or more computer programs comprising instructions that, when executed by the one or more processors, cause the electronic device to perform a method of vehicle body attachment point dynamic stiffness post-processing as in the embodiments described above.
The invention also discloses a computer readable medium comprising a computer program which, when run on a computer, causes the computer to execute the method for post-processing of dynamic stiffness of a vehicle body attachment point as in the above embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the apparatus, the electronic device and the computer-readable medium described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Those skilled in the art will appreciate that the modules described above may be distributed in the apparatus according to the description of the embodiments, or may be modified accordingly in one or more apparatuses unique from the embodiments. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules (units).
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application may be embodied in the form of a software product, which may be stored in a readable medium or on a network, and includes several instructions to enable an electronic device (which may be a personal computer, a server, a mobile terminal, or a network device) to execute the method according to the embodiments of the present application.
The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope disclosed in the present application, and all the technical solutions falling within the scope of the present invention defined by the claims fall within the scope of the present invention.
Claims (10)
1. A vehicle body attachment point dynamic stiffness post-processing method is characterized by comprising the following steps:
numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body;
exporting the numbered analysis model;
submitting the exported analysis module to a solver for calculation to obtain a calculation result;
compiling mvw files, extracting acceleration responses of all the analysis points in three directions from the calculation results, and calculating dynamic stiffness K according to the acceleration responsesa；
The dynamic stiffness K is obtained according to calculationaAnd drawing a dynamic stiffness curve.
2. The method of vehicle body attachment point dynamic stiffness post-processing of claim 1 wherein the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is as follows:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is the acceleration and the circular frequency w is 2 pi f.
3. The vehicle body attachment point dynamic stiffness post-processing method according to claim 2, characterized in that the dynamic stiffness K is calculated from the acceleration responseaThe method comprises the following steps:
obtaining an IPI response curve according to the formula (1);
calculating the area enclosed by the IPI response curve, then:
obtaining the dynamic stiffness K of the attachment pointaThe following were used:
4. the vehicle body attachment point dynamic stiffness post-processing method according to claim 1, characterized in that the dynamic stiffness K is calculated from the acceleration responseaThe method also comprises the following steps: the dynamic stiffness K obtained by calculationaAnd comparing with the dynamic stiffness target value to evaluate the dynamic stiffness level of each attachment point.
5. A vehicle body attachment point dynamic stiffness aftertreatment device, comprising:
a numbering module for numbering analysis points on an analysis model, wherein the analysis points comprise a plurality of attachment points of a vehicle body;
the model export module is used for exporting the numbered analysis model;
the model submitting module is used for submitting the exported analysis module to a solver for calculation to obtain a calculation result;
the data exporting and calculating module is used for compiling mvw files, extracting acceleration responses of all the analysis points in three directions from the calculation results, and calculating dynamic stiffness K according to the acceleration responsesa；
A curve drawing module for calculating the dynamic stiffness KaAnd drawing a dynamic stiffness curve.
6. The vehicle body attachment point dynamic stiffness aftertreatment device of claim 5, wherein the extracted acceleration response includes, but is not limited to, a source point acceleration admittance IPI, which is given by:
wherein, KaF/x is dynamic stiffness of attachment point, and a w2x is the acceleration and the circular frequency w is 2 pi f.
7. The vehicle body attachment point dynamic stiffness post-processing device of claim 6, wherein the data derivation and calculation module further comprises:
an IPI response curve obtaining unit, configured to obtain an IPI response curve according to the formula (1);
an area calculation unit, configured to calculate an area enclosed by the IPI response curve, including:
a dynamic stiffness calculation unit for obtaining the dynamic stiffness K of the attachment point according to the formula (2)aThe following are:
8. the vehicle body attachment point dynamic stiffness post-processing device of claim 5, wherein the data derivation and calculation module further comprises: a comparison unit for calculating the dynamic stiffness KaAnd comparing with the dynamic stiffness target value to evaluate the dynamic stiffness level of each attachment point.
9. An electronic device, comprising: one or more processors; one or more memories; the one or more memories store one or more computer programs, the one or more computer programs comprising instructions, which when executed by the one or more processors, cause the electronic device to perform the method of any of claims 1-4.
10. A computer-readable medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 4.
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