CN112287505A - Method and device for generating front wheel envelope, and computer storage medium and equipment - Google Patents
Method and device for generating front wheel envelope, and computer storage medium and equipment Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for generating front wheel envelopes, a computer storage medium and computer equipment, which are used for improving the envelope analysis precision. The method provided by the embodiment of the invention comprises the following steps: receiving input limit range data of front wheel runout and limit range data of front wheel steering, wherein the limit range data of the front wheel runout are represented by a range of positions of geometric center points of front wheels; the limit range data of the front wheel steering is represented by the position of any fixed point on the central axis of the front wheel; outputting a first coordinate value set of a central point of the front wheel and a second coordinate value set of a fixed point on a central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering; acquiring outline data of a front wheel tire; and generating a front wheel tire envelope according to the shape profile data, the first coordinate value set and the second coordinate value set. The embodiment of the invention can improve the precision of envelope analysis.
Description
Technical Field
The present invention relates to the field of automotive technologies, and in particular, to a method and an apparatus for generating a front tire envelope, and a computer storage medium and a computer device.
Background
The envelope surface of the tire is the space occupied by the wheel when it is jumping up and down and turning to the extreme position. The tire envelope surface can be used for checking the motion interference condition of the wheel and the peripheral subsystems, and simultaneously influencing the design change of the subsystems, such as a transverse stabilizer bar, a frame and the like; at the initial stage of design, the tire motion envelope also influences parameters such as the track developed by the whole vehicle framework, the minimum turning diameter of the whole vehicle and the like. Therefore, in the early development stage of the whole vehicle project, the method has certain functions and significance in accurately calculating and analyzing the tire motion envelope.
At present, in the method for generating the tire envelope surface in the automobile industry, motion simulation software is used for generating the envelope surface of a motion track, for example, 10 combined working conditions of no-load, half-load, full-load, suspension stretching, suspension compressing, left-turn limit, right-turn limit and the like of a vehicle are sequentially simulated and analyzed in a DMU module of the motion simulation software (CATIA), different postures are output according to different working conditions through simulation of the working conditions, the postures comprise wheel jumping and wheel turning, the envelope surface is generated according to the output postures, the analyzed working conditions are insufficient, the number of the output postures is small, the generated motion envelope is rough, and the analysis precision is not high.
Disclosure of Invention
The embodiment of the invention provides a method and a device for generating a front wheel envelope, a computer storage medium and equipment for improving analysis precision.
In a first aspect, an embodiment of the present invention provides a method for generating a front wheel envelope, including:
receiving input limit range data of front wheel runout and limit range data of front wheel steering, the limit range data of front wheel runout being represented by a range of positions of geometric center points of the front wheels; the limit range data of the front wheel steering is represented by the position of any fixed point on the central axis of the front wheel;
determining a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering;
acquiring outline data of the front wheel tire;
generating the front tire envelope from the profile data, the first set of coordinate values, and the second set of coordinate values.
In a possible implementation manner, the determining a first set of coordinate values of the center point of the front wheel and a second set of coordinate values of a fixed point on the central axis of the front wheel according to the limit range data of the front wheel bouncing and the limit range data of the front wheel steering includes:
carrying out simulation analysis according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering to obtain a relationship curve between the wheel center motion trail of the front wheel and the steering;
and outputting a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the wheel center motion track and steering relation curve.
In a possible implementation manner, before outputting the first set of coordinate values of the center point of the front wheel and the second set of coordinate values of a fixed point on the central axis of the front wheel according to the wheel center motion trajectory and steering relation curve, the method further includes:
matching the range represented by the wheel center motion track and steering relation curve of the front wheels with the limit range data of the front wheel jumping and the limit range data of the front wheel steering;
and if the range represented by the wheel center motion trail and steering relation curve of the front wheels is matched with the limit range data of the front wheel jumping and the limit range data of the front wheel steering, outputting a first coordinate value set of the center point of the front wheels and a second coordinate value set of a fixed point on the central axis of the front wheels according to the wheel center motion trail and steering relation curve.
In one possible implementation, the acquiring profile data of the front wheel tire includes:
receiving a selection instruction of a type of a tire;
calling a corresponding tire characteristic file according to the selection instruction, wherein the tire characteristic file comprises relevant parameters for representing tire characteristics;
receiving input parameter values corresponding to the relevant parameters, wherein the relevant parameters comprise a size parameter of the tire and a tread line size parameter of the tire;
and generating a profile graph of a longitudinal section of the tire according to the relevant parameters of the tire and the parameter values corresponding to the relevant parameters, wherein the longitudinal section is a section passing through the central axis.
In one possible implementation, before receiving the data of the limit range of the front wheel runout and the data of the limit range of the front wheel steering, the method further includes:
establishing a simulation model of a suspension and a steering mechanism, wherein the simulation model comprises a suspension system, the steering mechanism and front wheels, and the suspension system comprises flexible parts.
In a second aspect, an embodiment of the present invention provides an apparatus for generating a front wheel envelope, including:
a receiving module for receiving limit range data of front wheel runout and limit range data of front wheel steering, wherein the limit range data of front wheel runout is represented by a range of positions of geometric center points of the front wheels; the limit range data of the front wheel steering is represented by the position of any fixed point on the central axis of the front wheel;
the output module is used for outputting a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering received by the receiving module;
the acquisition module is used for acquiring the outline data of the front wheel tire;
and the generating module is used for generating the front tire envelope according to the outline profile data acquired by the acquiring module, the first coordinate value set and the second coordinate value set output by the output module.
In a third aspect, an embodiment of the present invention provides a computer device, including:
a memory, a processor, and an input-output device; the memory, the processor and the input and output equipment are connected through a bus; the memory for storing computer executable program code; wherein the program code comprises instructions which, when executed by the processor, cause the computer apparatus to perform the method of generating a front wheel envelope as described in the first aspect above.
In a fourth aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for a computer device, which includes instructions for performing the method for generating a front wheel envelope according to the first aspect.
In the embodiment of the invention, the computer equipment receives the input limit range data of the front wheel jumping and the input limit range data of the front wheel steering, and the position of the geometric center point of the front wheel can determine the position of the front wheel, so that the limit range data of the front wheel jumping is represented by the range of the position of the geometric center point of the front wheel; the position of any fixed point on the central axis of the front wheel can determine the steering of the front wheel, therefore, the limit range data of the steering of the front wheel is represented by the range of the position of any fixed point on the central axis of the front wheel; then, a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel are further output according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering; and generating a front wheel tire envelope according to the tire outline data, the first coordinate value set and the second coordinate value set. The unique motion attitude of the tire can be determined by any fixed point on the central point and the central axis of the tire, so that the first coordinate value set and the second coordinate value set can comprise position information of all working conditions in tire motion envelope analysis, the analysis working conditions are sufficient, the tire envelope analysis precision is improved, and the envelope surface is continuous and smooth.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings.
FIG. 1 is a flow chart illustrating an embodiment of a method for generating a front wheel envelope according to an embodiment of the present invention;
FIG. 2 is a schematic view of the attitude of a front wheel tire in an embodiment of the present invention;
FIG. 3 is a schematic view of a scenario illustrating a limit range data of front wheel runout and a limit range data of front wheel steering according to an embodiment of the present invention;
FIG. 4 is a graph showing the relationship between the movement locus of the front wheel hub and the steering direction in the embodiment of the present invention;
FIG. 5 is a schematic view of a profile view of a longitudinal section of a tire in an embodiment of the present invention;
FIG. 6 is a schematic illustration of a first set of coordinate values in an embodiment of the invention;
FIG. 7 is a schematic illustration of a second set of coordinate values in an embodiment of the invention;
FIG. 8 is a schematic view of a front tire envelope in an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an apparatus for generating a front wheel envelope according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for generating front wheel envelopes, which is used for analyzing the envelope.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived from the embodiments of the present invention by a person of ordinary skill in the art are intended to fall within the scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The tire envelope surface refers to the space occupied by the automobile wheels when the automobile wheels jump up and down and turn left and right to the limit positions. The embodiment of the present invention provides a method for generating a front wheel envelope, which is applied to a computer device, for example, the computer device may be an industrial control computer, a network computer, a Personal Computer (PC), and the like, and the embodiment of the present invention is not limited in particular.
Referring to fig. 1 for understanding, fig. 1 is a schematic flow chart illustrating a method for generating a front wheel envelope according to an embodiment of the present invention. A front wheel envelope is described in detail below by way of an embodiment, and the method may specifically include the following steps:
s101, receiving input limit range data of front wheel runout and input limit range data of front wheel steering, wherein the limit range data of the front wheel runout are represented by a range of positions of geometric center points of front wheels; the limit range data of the front wheel steering is expressed by the position of any fixed point on the central axis of the front wheel.
During the running process of the automobile, due to the constraint of the suspension system, the front wheel of the automobile can jump up and down when being vertically impacted. Meanwhile, under the control of a steering system, the front wheels can rotate around the main pin to realize steering. Therefore, the movement of the wheels is represented by the coupling of wheel jump and steering, and the movement space of the wheels depends on the up-down jump range and the steering range of the wheels. In order to describe the limit positions which the wheels can reach, on the basis of a large amount of test data, a limit range of the front wheel jumping and a limit range of the front wheel steering are obtained by combining simulation analysis and experience and are used for reflecting the movement limit positions of the wheels.
Referring to fig. 2, fig. 2 is a schematic view of the tire attitude. The attitude of the front wheel includes the position of the tire and the steering direction of the tire, the center point 20 of the tire of the front wheel can determine the position of the tire, any fixed point 22 on the central axis 21 of the tire can determine the steering direction and inclination of the tire, and the position of the wheel and the steering direction of the wheel can be determined by determining the coordinates of the center point 20 of the wheel and any fixed point 22 on the central axis 21. At the same time, the rotational movement of the wheel about the central axis 21 does not affect its motion envelope, since the wheel shape is centrosymmetric about its central axis 21. Thus, in the present embodiment, the limit range data of the front wheel runout is represented by the range of the position of the geometric center point 20 of the front wheel; the limit range data for the steering of the front wheels is represented by the position of any one of the fixed points 22 on the center axis of the front wheels.
Referring to fig. 3, fig. 3 is a schematic view of a scene of the data of the limit range of the front wheel runout and the data of the limit range of the front wheel steering. In one application scenario, a computer device is loaded with motion simulation software, such as Automatic Mechanical system dynamics Analysis of Mechanical Systems (AMADS), and receives, through an interactive interface of the motion simulation software, limit range data of front wheel steering of a limit range data set of front wheel run-out input by a user, where the limit range data can be shown in table 1 below:
TABLE 1
In the AMADS, the limit range curve of the front wheel bounce and the steering shown in fig. 3 can be obtained according to the limit range data of the front wheel suspension bounce and the limit range data of the front wheel steering in the table 1, and in the limit range curve in fig. 3, the steering of the wheels is reflected by taking the travel of the steering rack as the abscissa; the central position of the front wheel is used as a vertical coordinate to reflect the vertical run-out of the wheel; the exemplary front wheel hop and steering limits in FIG. 3 are: the limit range of steering is: -75 to 75, the limit of wheel hop being 60 when the steering reaches the limit (-75); when steering reaches limit 75, the limit of wheel hop is 60; wheel hop can reach limit 75 when steering is in the range of (-10) to 10. The wheels of the vehicle do not reach the bump limit and the steering limit simultaneously while the vehicle is in motion.
S102, determining a first coordinate value set of a center point of a front wheel and a second coordinate value set of a fixed point on a central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering.
And taking the limit range data of the front wheel suspension jumping and the limit range data of the front wheel steering as a drive file of simulation analysis. In a possible implementation manner, in the AMADS, when performing simulation analysis according to the drive file, and performing simulation analysis on wheel equidirectional bouncing (wheel analysis) and left-right Steering motion (Steering), a computer device may generate a first data analysis file corresponding to the bouncing simulation analysis according to a motion trajectory of a wheel, and generate a second data analysis file corresponding to the Steering motion, where the first data analysis file includes a first coordinate value set of a wheel center (geometric center point), and the second data analysis file includes a second coordinate value set of a certain fixed point on a central axis.
In another possible implementation manner, please refer to fig. 4 for understanding, and fig. 4 is a curve of the motion trajectory of the wheel center (geometric center point) of the front wheel and the steering relationship. And taking the limit range data of the front wheel suspension jumping and the limit range data of the front wheel steering as a drive file of simulation analysis. The driving file is called to carry out simulation analysis, the motion trail of the wheel is recorded in the simulation motion process of the wheel, and the posture of the wheel can be determined according to the geometric center point (x1, y1, z1) of the wheel and the motion trail of any fixed point (x2, y2, z2) on the central axis, so that the relationship curve between the motion trail of the wheel center of the front wheel and the steering is obtained. Then matching the range represented by the relationship curve between the wheel center motion track and the steering of the front wheels with the limit range data of the suspension jumping and the limit range data of the front wheel steering; the purpose of matching is to determine whether the simulation analysis result of the simulation analysis is consistent with the set limit range, for example, as can be seen from fig. 4, the wheel center motion trajectory and steering relationship curve of the front wheels is consistent with the input limit range of the suspension bounce and the input limit range of the front wheel steering, which indicates that the simulation trajectory is accurate. And further outputting a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the wheel center motion track and steering relation curve.
And S103, acquiring the outline data of the front wheel tire.
Parameters corresponding to different types of tires can be stored in advance aiming at different tire types, for example, an ADAMS/View tire model can be adopted, or an ADAMS/CAR tire model can also be adopted, and the ADAMS/View tire model can be taken as an example for description, for example, the tire model can include a Delft tire model, a Fiala tire model, a smiths tire model, a UA tire model and a User Defined tire model, wherein the fial tire model, the UA tire model and the User Defined tire model are analytic models, and the Delft tire model and the smiths tire model are experimental models. The different types of tire models may include different parameters, for example, in the tire characteristics file of UA tire models, the parameters included are: r1: the free radius of the tire; r2: the crown radius of the tire; CN: radial stiffness of the tire at a deformation of 0; CSLIP: longitudinal slip stiffness of the tire at a slip amount of 0, and the like. The specific steps of obtaining the profile data of the front wheel tire may be:
firstly, a computer device receives an input selection instruction of the type of the tire; for example, the selection instruction indicates that the selected tire type is the "custom type".
Further, the computer device calls a corresponding tire characteristic file according to the selection instruction, wherein the tire characteristic file comprises related parameters for representing the tire characteristics; such as the free radius of the tire, the crown radius of the tire, the radial stiffness, etc.
Then, the computer equipment receives the input parameter values corresponding to the relevant parameters, wherein the relevant parameters comprise the size parameter of the tire, the tread line shape and the size parameter of the tire; the tire size parameters comprise R1 (free radius of the tire), R2 (crown radius of the tire), total width of the tire and the like, and the tire tread texture size parameters comprise texture direction (longitudinal texture or transverse texture), texture depth, texture width, texture shape and the like. In this example, further to the consideration of tire tread pattern shape and dimensional parameters, since the vehicle is supported on the road by the tire, it is the tire pattern that is in direct contact with the road. The tyre not only bears and rolls, but also becomes a power source for driving, braking and steering of an automobile through the friction force generated by the pattern blocks and the road surface, and the pattern shape and the size parameters of the tyre surface of the tyre have certain influence on the steering of the wheel.
As will be understood in conjunction with fig. 5, fig. 5 is a profile view of a longitudinal section of a tire in an embodiment of the present invention. And finally, generating a profile graph of the longitudinal section of the tire by the computer equipment according to the relevant parameters of the tire and the parameter values corresponding to the relevant parameters. It should be noted that "horizontal" and "vertical" in this example are relative concepts, and a vertical section in the embodiment of the present invention is a section passing through the central axis, and a cross section is a section perpendicular to the central axis. For example, the profile pattern of the tire longitudinal section is generated according to parameters such as R1 (free radius), R2 (crown radius), grain size, grain shape and the like and specific corresponding parameter values, for example, the parameter value of the grain shape can be longitudinal grain, transverse grain, twill or mixed grain and the like. It should be noted that a longitudinal groove may be understood as a groove along the rolling direction of the tire, and a transverse groove may be understood as a groove along the axis of the tire or a groove in a direction having a small deflection angle (e.g., a deflection angle of less than 5 degrees) with respect to the axis; the mixed pattern can be understood as a combined application of at least two of longitudinal lines, transverse lines and diagonal lines. The line shape size parameters comprise the width of the tire tread line, the line depth and the like. It should be noted that the tire has a very large number of patterns, and in this embodiment, the shape and size of the main pattern are mainly considered, and the main pattern is a groove with a pattern depth greater than or equal to a first threshold (e.g. 3.5mm), or a groove with a pattern width greater than or equal to a second threshold (e.g. 3 mm). For example, the shape of the main line in the embodiment of the present invention is a longitudinal line, the line depth is 8mm, the line width is 5mm, and the like, and it should be noted that the first threshold, the second threshold, the line depth, and the line width in the embodiment are only examples, and do not limit the present invention.
In the embodiment of the invention, the outline data comprises the tire tread line shape and the size parameters, and the influence of the tire tread line shape and the size on the steering is further considered, so that the tire envelope analysis precision is improved.
It should be noted that, the step is not limited to the steps 101 and 102 in time sequence, the step 103 may precede the step 101, or the step 103 may precede the step 102, and the specific embodiment of the present invention is not limited thereto.
And S104, generating a front tire envelope according to the outline data, the first coordinate value set and the second coordinate value set.
Referring to fig. 6-8 for understanding, fig. 6 is a schematic diagram of a first set of coordinate values (a set of coordinate values of a center point of a front wheel) according to an embodiment of the present invention, where the first set of coordinate values may reflect a run-out range; FIG. 7 is a schematic diagram of a second set of coordinate values (a set of fixed points on the front wheel axis) in an embodiment of the present invention; the second coordinate value set can reflect the steering range, the reference system is OXYZ, an ISO coordinate system is adopted, the origin point is located at the midpoint of a connecting line of wheel centers of the two front wheels, the positive direction of the X axis is opposite to the driving direction of the automobile, the positive direction of the Y axis points to the left side of the driving direction of the automobile, and the positive direction of the Z axis is vertically upward. The first set of coordinate values and the second set of coordinate values contain position information for all operating conditions in the tire motion envelope analysis.
Referring to fig. 8, fig. 8 is a schematic diagram of a front tire envelope. Further, the outline data, the first coordinate value set and the second coordinate value set are input into three-dimensional software, and the tire envelope is swept through the three-dimensional software. For example, the three-dimensional software can be UG models, PRO/E, CATIA, and the like.
In the embodiment of the invention, the computer equipment receives the input limit range data of the front wheel jumping and the input limit range data of the front wheel steering, and the position of the geometric center point of the front wheel can determine the position of the front wheel, so that the limit range data of the front wheel jumping is represented by the range of the position of the geometric center point of the front wheel; the position of any fixed point on the central axis of the front wheel can determine the steering of the front wheel, therefore, the limit range data of the steering of the front wheel is represented by the range of the position of any fixed point on the central axis of the front wheel; then, a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel are further output according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering; and obtaining the envelope of the front wheel tire according to the shape profile data, the first coordinate value set and the second coordinate value set. The unique motion attitude of the tire can be determined by any fixed point on the central point and the central axis of the tire, so that the position information of all working conditions in the tire motion envelope analysis can be included through the first coordinate value set and the second coordinate value set, the analysis working conditions are sufficient, the tire envelope analysis precision is improved, and the envelope surface is continuous and smooth.
Optionally, before receiving the data of the limit range of the front wheel suspension bounce and the data of the limit range of the front wheel steering, the method further includes:
establishing a simulation model through ADAMS, wherein the simulation model comprises a suspension system, and the suspension system comprises a steering mechanism, a front wheel and a flexible component; the steering mechanism is used for steering the front wheels; the flexible member is positioned between the suspension system and the vehicle body. By utilizing an ADAMS/Car special analysis software package in ADAMS, an automobile subsystem and whole automobile assembly can be conveniently and quickly created. In the rigid model of the front suspension, besides the rotation of the wheels around the axles, the system has three degrees of freedom of movement: up and down bouncing of the left and right wheels and rotation of the wheels around the kingpin. In order to simulate the characteristics of a flexible suspension comprising an elastic element, for example, a spherical hinge at the joint of the upper part of a shock absorber and a vehicle body in a front suspension system and two rotating hinges between a lower swing arm and the vehicle body can be changed into elastic connection of rubber bushings. Wherein the anisotropic stiffness of the rubber bushing is defined by modifying a property file of the bushing, the front suspension system being a flexible body system. In simulation analysis, the model can reflect the elastic deformation of the elastic element under the driving condition. In the simulation system of the ADAMS/Car, rigid body characteristics of rigid body parts and flexible characteristics of elastic bodies such as rubber bushings are considered at the same time, so that a suspension multi-body system model built in the ADAMS/Car has dynamic characteristics closer to those of a real vehicle. Due to the fact that elastic deformation generated by the flexible part is considered, a more accurate wheel motion track can be obtained based on a simulation test performed by the simulation model, and the accuracy of the first coordinate value set and the second coordinate value set is improved.
Referring to fig. 9, an embodiment of the present invention further provides a device 900 for generating a front wheel envelope, where the device may specifically include:
a receiving module 901, configured to receive limit range data of front wheel suspension bounce and limit range data of front wheel steering, where the limit range data of front wheel suspension bounce is represented by a range of positions of a geometric center point of a front wheel; the limit range data of the front wheel steering is represented by the position of any fixed point on the central axis of the front wheel;
a determining module 902, configured to determine a first set of coordinate values of a center point of the front wheel and a second set of coordinate values of a fixed point on a central axis of the front wheel according to the limit range data of front wheel suspension bounce and the limit range data of front wheel steering received by the receiving module 901;
an obtaining module 903, configured to obtain profile data of the front tire;
a generating module 904, configured to generate the front wheel envelope according to the outline profile data acquired by the acquiring module 903, the first coordinate value set and the second coordinate value set output by the output module.
Optionally, the determining module 902 is further specifically configured to perform simulation analysis according to the limit range data of the front wheel suspension bounce and the limit range data of the front wheel steering to obtain a relationship curve between the wheel center motion trajectory of the front wheel and the steering;
and outputting a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the wheel center motion track and steering relation curve.
Optionally, the determining module 902 is further specifically configured to match a range represented by a relationship curve between a wheel center motion trajectory of the front wheel and steering with the limit range data of the suspension bounce and the limit range data of the front wheel steering;
and if the range represented by the wheel center motion trail of the front wheels and the steering relation curve is matched with the limit range data of the suspension jumping and the limit range data of the front wheel steering.
Optionally, the obtaining module 903 is further specifically configured to receive a selection instruction of the type of the tire;
calling a corresponding tire characteristic file according to the selection instruction, wherein the tire characteristic file comprises relevant parameters for representing the tire characteristics;
receiving input parameter values corresponding to the relevant parameters, wherein the relevant parameters comprise a size parameter of the tire and a tread line size parameter of the tire;
and generating a profile graph of a longitudinal section of the tire according to the relevant parameters of the tire and the parameter values corresponding to the relevant parameters, wherein the longitudinal section is a section passing through the central axis.
Optionally, the system further comprises a model establishing module, configured to establish a simulation model of the suspension and the steering mechanism, where the simulation model includes a suspension system, the steering mechanism, and the front wheels, and the suspension system includes a flexible component.
In the embodiment of the invention, the receiving module receives input limit range data of the front wheel suspension jumping and input limit range data of the front wheel steering, and the position of the geometric center point of the front wheel can be determined, so that the limit range data of the front wheel suspension jumping are represented by the range of the position of the geometric center point of the front wheel; the position of any fixed point on the central axis of the front wheel can determine the steering of the front wheel, therefore, the limit range data of the steering of the front wheel is represented by the range of the position of any fixed point on the central axis of the front wheel; then, a further determining module outputs a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering; the generating module can obtain the envelope of the front tire according to the shape profile data, the first coordinate value set and the second coordinate value set. The unique motion attitude of the tire can be determined by any fixed point on the center point and the central axis of the tire, so that the position information of all working conditions in the tire motion envelope analysis can be included through the first coordinate value set and the second coordinate value set, the working conditions are analyzed sufficiently, and the tire envelope analysis precision is improved.
Referring to fig. 10, an embodiment of the present invention further provides a computer device 1000, where the computer device 1000 may specifically include:
a memory 1001, a processor 1002, and an input-output device 1003; the memory 1001, the processor 1002, and the input/output device 1003 are connected by a bus system 1004; the processor 1002 may also be referred to as a CPU (Central Processing Unit). The memory 1001 may include a read only memory 1001 and a random access memory 1001 and provides instructions and data to the processor 1002. A portion of the memory 1001 may also include non-volatile random access memory 1001 (NVRAM). The bus system 1004 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 1004.
The method disclosed by the embodiment of the invention can be applied to the processor 1002 or implemented by the processor 1002. The processor 1002 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1002. The processor 1002 may be a general purpose processor 1002, a digital signal processor 1002(DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. The general purpose processor 1002 may be a microprocessor 1002 or the processor 1002 may be any conventional processor 1002 or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by the hardware decoding processor 1002, or may be implemented by a combination of hardware and software modules in the decoding processor 1002. The software module may be located in ram 1001, flash memory, rom 1001, prom 1001 or eeprom 1001, registers, etc. The storage medium is located in the memory 1001, and the processor 1002 reads the information in the memory 1001 and completes the steps of the method in combination with the hardware thereof.
The input and output device 1003 is used for receiving operation instructions of a user, receiving the data of the limit range of the front wheel suspension bounce and the data of the limit range of the front wheel steering received by the module, or outputting information and images, such as the envelope of the front wheel tire.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for generating a front wheel envelope, comprising:
receiving input limit range data of front wheel runout and limit range data of front wheel steering, the limit range data of front wheel runout being represented by a range of positions of geometric center points of the front wheels; the limit range data of the front wheel steering is represented by the position of any fixed point on the central axis of the front wheel;
determining a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering;
acquiring outline data of the front wheel tire;
generating the front tire envelope from the profile data, the first set of coordinate values, and the second set of coordinate values.
2. The method for generating a front wheel envelope according to claim 1, wherein said determining a first set of coordinate values of a center point of said front wheel and a second set of coordinate values of a fixed point on an axis of said front wheel based on said limit range data of front wheel bounce and said limit range data of front wheel steer comprises:
carrying out simulation analysis according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering to obtain a relationship curve between the wheel center motion trail of the front wheel and the steering;
and outputting a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the wheel center motion track and steering relation curve.
3. The method for generating a front wheel envelope according to claim 2, wherein before outputting the first set of coordinate values of the center point of the front wheel and the second set of coordinate values of a fixed point on the center axis of the front wheel according to the relationship between the motion trajectory of the center of the wheel and the steering, the method further comprises:
matching the range represented by the wheel center motion track and steering relation curve of the front wheels with the limit range data of the front wheel jumping and the limit range data of the front wheel steering;
and if the range represented by the wheel center motion trail and steering relation curve of the front wheels is matched with the limit range data of the front wheel jumping and the limit range data of the front wheel steering, outputting a first coordinate value set of the center point of the front wheels and a second coordinate value set of a fixed point on the central axis of the front wheels according to the wheel center motion trail and steering relation curve.
4. The method for generating a front wheel envelope according to claim 1, wherein said acquiring profile data of the front wheel tire includes:
receiving a selection instruction of a type of a tire;
calling a corresponding tire characteristic file according to the selection instruction, wherein the tire characteristic file comprises relevant parameters for representing tire characteristics;
receiving input parameter values corresponding to the relevant parameters, wherein the relevant parameters comprise a size parameter of the tire and a tread line size parameter of the tire;
and generating a profile graph of a longitudinal section of the tire according to the relevant parameters of the tire and the parameter values corresponding to the relevant parameters, wherein the longitudinal section is a section passing through the central axis.
5. The method for generating a front wheel envelope according to claim 1, wherein before receiving the data of the limit range of the front wheel runout and the data of the limit range of the front wheel steering, the method further comprises:
establishing a simulation model, wherein the simulation model comprises a suspension system, and the suspension system comprises a steering mechanism, a front wheel and a flexible component; the steering mechanism is used for steering the front wheels; the flexible member is positioned between the suspension system and the vehicle body.
6. A device for generating a front wheel envelope, comprising:
a receiving module for receiving limit range data of front wheel runout and limit range data of front wheel steering, wherein the limit range data of front wheel runout is represented by a range of positions of geometric center points of the front wheels; the limit range data of the front wheel steering is represented by the position of any fixed point on the central axis of the front wheel;
the output module is used for outputting a first coordinate value set of the center point of the front wheel and a second coordinate value set of a fixed point on the central axis of the front wheel according to the limit range data of the front wheel jumping and the limit range data of the front wheel steering received by the receiving module;
the acquisition module is used for acquiring the outline data of the front wheel tire;
and the generating module is used for generating the front tire envelope according to the outline profile data acquired by the acquiring module, the first coordinate value set and the second coordinate value set output by the output module.
7. A computer device, comprising:
a memory, a processor, and an input-output device; the memory, the processor and the input and output device are connected through a bus; the memory for storing computer executable program code; wherein the program code comprises instructions which, when executed by the processor, cause the computer device to perform the method of generating a front wheel envelope as claimed in any one of claims 1-5.
8. A computer storage medium storing computer software instructions for a computer device comprising instructions for performing the method of generating a front wheel envelope according to any one of claims 1 to 5.
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