JP2016060381A - Tire surrounding space model generating apparatus, method, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a creation device for a tire circumferential space model which can achieve both of reduction of a model creation cost and improvement of an analysis accuracy.SOLUTION: A creation device for a tire circumferential space model has: a storage part 1 for storing grounding length data 10 in which data concerning a grounding length at a certain tire width direction position is correlated every tire width direction position; a tire outer surface model generating part 2 which generates an end face shape Li of a tire meridian cross section so that a grounding length L formed on an overlapping portion between a tire outer surface model M1 located at a predetermined tire axis position Pand a road surface ro becomes a grounding length corresponding to each tire width direction position in the grounding length data 10, and rotates the end face shape Li around a tire axis thereby generating the tire outer surface model M1; and a coupling part 3 which couples the tire outer surface model M1, a road surface model, an outermost surface model M2 of a tire circumferential space, and a groove space model M3 to one another, and generates a tire circumferential space model M4 which has a wedge-shaped space SP1 in the front and the rear of the tire.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus, a method, and a computer program for generating a tire surrounding space model that can be used for tire radiation sound analysis.

  2. Description of the Related Art Conventionally, a technique for predicting / evaluating radiated sound from a tire such as noise generated in an air column resonance tube formed between a tire tread pattern and a road surface is known. For example, Patent Document 1 discloses a groove space formed between a groove of a tread portion in a ground contact portion of a tire and a road surface, and a space connected to the groove space and having a predetermined shape outside the tire. And generating a spatial acoustic model obtained by dividing a tire peripheral space including a plurality of elements, and analyzing the radiated sound of the tire.

  Patent Document 2 describes that only a groove space formed between a tread pattern and a road surface is modeled, and a tire radiated sound is analyzed using only the groove space model.

JP 2010-036850 A JP 2007-237751

  The model generation method described in Patent Document 1 generates a tire FEM (Finite Element Method) model having a tread pattern, deforms the tire model by ground contact, and the outer surface and road surface of the deformed tire model. Generate a spatial model formed by This space model has a groove space formed between the tread pattern and the road surface, and also has a space between the tire outer surface and the road surface that is separated from the road surface (looks like a wedge when viewed along the tire axis). Therefore, analysis accuracy is preferable. However, while an accurate analysis result can be obtained, it is necessary to strictly generate the FEM tire model, which increases the model generation cost and the calculation cost, impairing practicality.

  On the other hand, since the model generation method described in Patent Document 2 uses only the groove space formed between the tread pattern and the road surface as a space model, if there is tread pattern data (including groove shape and groove depth), A space model can be generated, and the model generation cost and calculation cost are low and preferable. However, since the model generation method does not consider the contact shape and does not have a space between the tire outer surface and the road surface that is separated from the road surface, an air column formed between the tire outer surface and the road surface. The tube length of the resonance tube deviates greatly from the reality. Since the length of the air column resonance tube affects the analysis accuracy, the analysis accuracy is poor and is not practical.

  The present invention has been made paying attention to such problems, and an object of the present invention is to generate a tire surrounding space model, a method, and a computer program capable of achieving both reduction in model generation cost and improvement in analysis accuracy. Is to provide.

  In order to achieve the above object, the present invention takes the following measures.

  That is, the tire surrounding space model generating device according to the present invention provides contact length data in which data relating to a contact length at a certain tire width direction position is associated with each tire width direction position when the tire is deformed to contact under a predetermined load. And the contact length formed at the overlapping portion of the road surface and the tire outer surface model arranged at a predetermined tire axial position is a contact length corresponding to each tire width direction position in the contact length data. As described above, a tire outer surface model generation unit that generates an end surface shape of a tire meridian section and rotates the end surface shape around a tire axis to generate a tire outer surface model, and a tire obtained by the tire outer surface model generation unit The tread pattern is determined by an outer surface model, a road surface model having a predetermined shape, an outermost surface model of a tire surrounding space having a predetermined shape, and a tread pattern. Combining, and the groove space model between the tire and the road surface, characterized in that it comprises a coupling unit for generating a tire surrounding space model with a wedge-shaped space around the tire.

  The method for generating a tire surrounding space model according to the present invention stores ground contact length data in which data related to a ground contact length at a certain tire width direction position is associated with each tire width direction position when the tire is subjected to ground deformation under a predetermined load. The contact length formed at the overlapping portion of the road surface and the tire outer surface model arranged at a predetermined tire shaft position becomes the contact length corresponding to each tire width direction position in the contact length data. A step of generating an end surface shape of a tire meridian section, a step of rotating the end surface shape around a tire axis to generate a tire outer surface model, the tire outer surface model, and a road surface having a predetermined shape A model, an outermost surface model of a tire surrounding space having a predetermined shape, and a groove space model between a tire and a road surface determined by a tread pattern. Combined, and generating a tire surrounding space model with a wedge-shaped space around the tire, a.

  The computer program of the present invention causes a computer to execute the above method.

  As described above, the tire outer surface model is generated by generating the end face shape in the tire meridian cross section and rotating the end face shape so that the contact length corresponding to each position in the tire width direction is based on the contact length data. The tire outer surface model (without the tread pattern) can be generated without generating the FEM model, and the model generation cost can be reduced. Since the groove space model is determined by the tread pattern, the groove space model can be obtained without generating the FEM model, and the model generation cost can be reduced. Nevertheless, since the air column resonance tube formed by the groove space and the wedge-shaped space formed in front of and behind the tire can be accurately reproduced according to the real thing, it is possible to ensure analysis accuracy. Therefore, it is possible to achieve both reduction in model generation cost and improvement in analysis accuracy.

The block diagram which shows the production | generation apparatus of the tire surrounding space model of this invention. Explanatory drawing regarding the contact length data. The figure which shows the analysis result of the contact shape and contact pressure using a tire FEM model. The figure which shows the relationship between the circle | round | yen used as the foundation of a tire outer surface model, and a road surface. The figure which shows the end surface shape of the tire meridian cross section used as the foundation of a tire outer surface model. The perspective view which shows an example of a tire outer surface model. The perspective view which shows an example of the outermost surface model of tire surrounding space. The perspective view which shows an example of a groove space model. The partially broken perspective view which shows an example of a tire surrounding space model. The partially broken perspective view which shows an example of the space model divided by the outermost surface model, a tire outer surface model, and a road surface model. The figure which shows an example of the positional relationship of an outermost surface model, the whole tire, and a contact shape. The flowchart which shows the production | generation method of the tire surrounding space model which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[Tire surrounding space model generator]
As shown in FIG. 8, the tire surrounding space model generating apparatus according to the present invention is a tire surrounded by a groove space between a tire tread pattern and a road surface, a tire outer surface, a road surface, and an outermost surface of the tire surrounding space. This is a device for generating the surrounding space model M4.

  Specifically, as illustrated in FIG. 1, the tire surrounding space model generation device includes a storage unit 1, a tire outer surface model generation unit 2, and a coupling unit 3. These units 1 to 3 are realized by cooperation of software and hardware by executing a processing routine (not shown) stored in advance by the CPU in an information processing apparatus such as a personal computer having a CPU, memory, various interfaces, and the like. Is done.

  The storage unit 1 illustrated in FIG. 1 stores contact length data 10. The contact length data 10 is data in which data related to a contact length at a certain position in the tire width direction is associated for each position in the tire width direction when the tire is deformed by contact under a predetermined load which is one of analysis conditions. Specifically, as shown in FIG. 2A, the contact length data 10 represents the distribution of the contact length with respect to the position in the width direction. In the example of FIG. 2A, the position in the width direction is specified by a distance [mm] with respect to the tire equator. The contact length means the length [mm] of the contact portion in the tire longitudinal direction. As shown in FIG. 9, the contact length data 10 is used to reproduce the tire contact shape and the wedge-shaped space SP1 near the contact end. As shown in FIG. 2B, the contact length data 10 may be generated in advance based on the analysis result using the tire FEM model, or may be generated by measuring the tire contact length using an actual tire. Since the groove has no ground contact length, the groove may be interpolated using the ground contact lengths of both adjacent portions. The contact length data may be generated based on a tire having no tread pattern, but is preferably generated based on a tire having a tread pattern.

  The storage unit 1 shown in FIG. 1 stores data 13 related to a road surface model (not shown), data 11 related to the outermost surface model M2 of the tire surrounding space shown in FIG. 6, and data 12 related to the groove space model M3 shown in FIG. Each data 11, 12, and 13 may be model data itself, or may be basic data used for generating a model. The data 11, 12, 13 and the contact length data 10 are input to the apparatus from the outside and triggered by a user operation on an operation unit (not shown) and stored in the storage unit 1.

  As shown in FIGS. 4 and 5, the tire outer surface model generation unit 2 shown in FIG. 1 generates an end surface shape Li of the tire meridian cross section, and rotates the end surface shape Li around the tire axis so as to rotate the tire outer surface model. M1 is generated. As shown in FIG. 1, the tire outer surface model generation unit 2 includes a diameter calculation unit 20, an end surface shape generation unit 21, and a rotation generation unit 22.

Diameter calculating unit 20 shown in FIG. 1, as shown in FIG. 3, the contact length L is formed in the overlapping part of the circle C ₁ and the straight road ro around the tire axis position P ₁ a predetermined The diameter D of the circle C ₁ is changed to the tire width direction position based on the predetermined data on the tire shaft position P ₁ and the contact length data 10 so that the contact length corresponds to each tire width direction position in the contact length data 10. Calculate every time. In the present specification, the diameter D is used in the meaning of the radius, but may be the meaning of the diameter. Pre tire axial position P ₁ which defines means tire center position with respect to the road surface ro obtained while contact deformation of the tire at a predetermined load. The following formula (1) is used to calculate the diameter D.
The tire axial position height P ₁ with respect to the road surface ro represented by H. The tire dynamic load radius can also be used as H.

  As illustrated in FIG. 4, the end surface shape generation unit 21 illustrated in FIG. 1 generates the end surface shape Li of the tire meridian cross section based on the diameter D calculated by the diameter calculation unit 20. Specifically, the plot Pt is placed at a position spaced from the tire shaft by a distance corresponding to the diameter D from the tire radial direction outer side RD1. The plot Pt is set for each position in the tire width direction. Since each plot Pt is discrete, in order to generate a continuous end face shape, the end face shape Li (line data) in the tire meridian section is generated by interpolating between the plots Pt.

  In this way, the contact length L formed at the overlapping portion of the tire outer surface model arranged at a predetermined tire shaft position and the road surface becomes the contact length corresponding to each position in the tire width direction in the contact length data 10. Thus, the end face shape Li of the tire meridian cross section is generated.

  The rotation generation unit 22 illustrated in FIG. 1 generates the tire outer surface model M1 (see FIG. 5) by rotating the end surface shape (see FIG. 4) generated by the end surface shape generation unit 21 around the tire axis. The rotation angle may be 360 degrees, but if the rotation cross section generated when the rotation section is rotated at an angle smaller than 360 degrees does not intersect the surface of the outermost surface model M2, the angle smaller than 360 degrees But you can. In this embodiment, it is 180 degrees.

  1 includes a tire outer surface model M1 (see FIG. 5) obtained by the tire outer surface model generation unit 2, a road surface model (not shown) having a predetermined shape, and a predetermined shape. Tire outer space model M2 (see FIG. 6) having a tire space and a groove space model M3 (see FIG. 7) between a tire and a road surface defined by a tread pattern, and a tire having a wedge-shaped space before and after the tire An ambient space model M4 (see FIG. 8) is generated. Specifically, if the tire outer surface model M1 shown in FIG. 5 is cut from the outermost surface model M2 of the tire surrounding space shown in FIG. 6, as shown in FIG. A spatial model M5 that reproduces SP1 can be obtained. Furthermore, if the sum of the space model M5 and the groove space model M3 (see FIG. 7) is taken, the tire surrounding space model M4 can be obtained.

  The size of each model is preferably as follows.

  The outermost surface model M2 of the tire surrounding space is hemispherical, but as shown in FIG. 10, the diameter is not less than twice the contact length L (2L) and does not include the entire tire T. Is preferable. This is because the resonance characteristic cannot be predicted sufficiently if it is too narrow, and the calculation cost increases if it is too wide.

  The groove space model M3 preferably has a tube length that is longer than the maximum contact length in the contact length data 10 and does not exceed the outermost surface model M2. By making the tube length longer than the contact length, the shape of the tube opening can be accurately reproduced. This is because if the pipe length exceeds the outermost surface model M2, problems occur when the models are combined.

[Method for generating tire space model]
A method of generating a tire surrounding space model using the above-described generation apparatus will be described with reference to FIG.

  First, in step S100, the storage unit 1 stores contact length data 10 in which data related to a contact length at a certain tire width direction position is associated with each position in the tire width direction when the tire is deformed to contact under a predetermined load. To do.

In the next step S101, diameter calculating unit 20, each of the tire width direction of the circle C ₁ and the contact length L is the contact length data 10 formed overlap between the road surface ro centered on predetermined tire axial position The diameter D of the circle C ₁ is calculated for each position in the tire width direction based on the predetermined data related to the tire shaft position P ₁ and the contact length data 10 so that the contact length corresponding to the position is reached.

  In the next step S102, the end surface shape generation unit 21 generates the end surface shape Li of the tire meridian section based on the calculated diameter D.

  In the next step S103, the rotation generator 22 rotates the end face shape Li around the tire axis to generate the tire outer surface model M1.

  In the next step S104, the connecting portion 3 includes a tire outer surface model M1, a road surface model having a predetermined shape, an outermost surface model M2 of a tire surrounding space having a predetermined shape, and a tire determined by a tread pattern. The groove space model M3 between the road surfaces is coupled to generate a tire surrounding space model M4 having a wedge-shaped space SP1 before and after the tire.

As described above, the tire surrounding space model generating apparatus according to the present embodiment generates data on the contact length L at a certain tire width direction position for each position in the tire width direction when the tire is subjected to ground deformation under a predetermined load. A storage unit 1 for storing the associated ground contact length data 10;
The tire meridian so that the contact length L formed at the overlapping portion of the tire outer surface model M1 and the road surface ro arranged at a predetermined tire shaft position becomes the contact length corresponding to each position in the tire width direction in the contact length data. A tire outer surface model generation unit 2 that generates an end surface shape Li of the cross section, rotates the end surface shape Li around the tire axis, and generates a tire outer surface model M1;
Tire outer surface model M1 obtained by the tire outer surface model generation unit 2, a road surface model having a predetermined shape, an outermost surface model M2 of a tire surrounding space having a predetermined shape, a tire and a road surface determined by a tread pattern A coupling portion 3 that couples the groove space model M3 between the tires and generates a tire surrounding space model M4 having a wedge-shaped space SP1 before and after the tire;
Is provided.

The tire surrounding space model generation method according to the present embodiment is a computer-executed method, and when the tire is subjected to ground deformation under a predetermined load, data regarding the ground contact length at a certain tire width direction position is obtained. Storing the contact length data 10 associated with each position in the storage unit 1 (S100);
The tire is set so that the contact length L formed at the overlapping portion of the tire outer surface model M1 and the road surface ro arranged at a predetermined tire shaft position corresponds to each tire width direction position in the contact length data 10. Generating an end face shape Li of a meridian section (S101);
A step (S102) of generating the tire outer surface model M1 by rotating the end face shape Li around the tire axis;
A tire outer surface model M1, a road surface model having a predetermined shape, an outermost surface model M2 of a tire surrounding space having a predetermined shape, and a groove space model M3 between the tire and the road surface determined by a tread pattern; Combining to generate a tire surrounding space model M4 having a wedge-shaped space SP1 before and after the tire;
including.

  As described above, the tire outer surface is generated by generating the end face shape Li in the tire meridian cross section and rotating the end face shape Li so as to be the contact length L corresponding to each position in the tire width direction based on the contact length data 10. Since the model M1 is used, the tire outer surface model (without the tread pattern) can be generated without generating the FEM model, and the model generation cost can be reduced. Since the groove space model is determined by the tread pattern, the groove space model can be obtained without generating the FEM model, and the model generation cost can be reduced. Nevertheless, since the air column resonance tube formed by the groove space and the wedge-shaped space SP1 formed before and after the tire can be accurately reproduced according to the actual product, it is possible to ensure analysis accuracy. Therefore, it is possible to achieve both reduction in model generation cost and improvement in analysis accuracy.

In the apparatus of the present embodiment, the tire outer surface model generation unit 2 is
The contact length L formed at the overlapping portion of the circle C ₁ centered on the predetermined tire axis position and the road surface ro is set in advance so as to be a contact length corresponding to each position in the tire width direction in the contact length data 10. A diameter calculating unit 20 that calculates the diameter D of the circle C ₁ for each position in the tire width direction based on the data related to the determined tire axis position P ₁ and the contact length data 10;
An end surface shape generation unit 21 that generates the end surface shape Li of the tire meridian section based on the diameter calculated by the diameter calculation unit 20;
A rotation generation unit 22 that rotates the end surface shape Li generated by the end surface shape generation unit 21 around the tire axis to generate the tire outer surface model M1, and
Have

In the method of the present embodiment, the step of generating the end face shape Li of the tire meridian cross section includes:
The contact length L formed at the overlapping portion of the circle C ₁ centered on the predetermined tire axis position P ₁ and the road surface ro becomes a contact length corresponding to each position in the tire width direction in the contact length data 10. a step (S101) for calculating the diameter D of the circle C ₁ for every tire widthwise position on the basis of the contact length data 10 and data about the tire axis position P ₁ a predetermined,
Generating the end face shape Li of the tire meridian section based on the calculated diameter D (S102).

  According to such an apparatus configuration and method, the end face shape Li can be generated by a simple calculation, which is practical.

  The computer program which concerns on this embodiment is a program which makes a computer perform each step which comprises the production | generation method of the said tire surrounding space model.

  The storage medium of the present embodiment is a computer-readable storage medium that stores the computer program. Also by executing the above program, it is possible to obtain the effects of the above method. In other words, it can be said that the apparatus uses the method.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, each unit 2-3 shown in FIG. 1 is realized by executing a predetermined program by a CPU of a computer, but each unit may be configured by a dedicated memory or a dedicated circuit.

  The structure employed in each of the above embodiments can be employed in any other embodiment. The specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 ... storage unit 10 ... contact length data 2 ... tire outer surface model generating unit 20 ... diameter calculating unit 21 ... end surface shape generation section 22 ... rotating generator 3 ... coupling portion P 1 _... tire axial position L ... contact length Li ... Tire End face shape of meridian cross section SP1 ... wedge-shaped space M1 ... tire outer surface model M2 ... outermost surface model of tire surrounding space M3 ... groove space model M4 ... tire surrounding space model

Claims (5)

A storage unit that stores contact length data in which data related to a contact length in a certain tire width direction position is associated with each position in the tire width direction when the tire is deformed by contact under a predetermined load;
The tire meridian cross section is such that the contact length formed at the overlapping portion of the road surface and the tire outer surface model arranged at a predetermined tire axial position is the contact length corresponding to each tire width direction position in the contact length data. A tire outer surface model generating unit that generates an end surface shape and rotates the end surface shape around the tire axis to generate a tire outer surface model;
Between the tire outer surface model obtained by the tire outer surface model generation unit, a road surface model having a predetermined shape, an outermost surface model of a tire surrounding space having a predetermined shape, and a tire and a road surface determined by a tread pattern A groove space model, and a coupling portion for generating a tire surrounding space model having a wedge-shaped space before and after the tire,
An apparatus for generating a tire surrounding space model, comprising: The tire outer surface model generation unit is
A predetermined tire shaft is set so that the contact length formed at the overlapping portion between the circle centered on the predetermined tire shaft position and the road surface is a contact length corresponding to each position in the tire width direction in the contact length data. A diameter calculation unit that calculates the diameter of the circle for each position in the tire width direction based on the position-related data and the contact length data;
An end face shape generating section for generating an end face shape of a tire meridian section based on the diameter calculated by the diameter calculating section;
A rotation generator that rotates the end face shape generated by the end face shape generator around the tire axis to generate a tire outer surface model;
The tire peripheral space model generating device according to claim 1, comprising: A step of storing, in a storage unit, contact length data in which data relating to a contact length in a certain tire width direction position is associated with each position in the tire width direction when the tire is deformed by contact under a predetermined load;
The tire meridian cross section is such that the contact length formed at the overlapping portion of the road surface and the tire outer surface model arranged at a predetermined tire axial position is the contact length corresponding to each tire width direction position in the contact length data. Generating an end face shape;
Rotating the end face shape around a tire axis to generate a tire outer surface model;
The tire outer surface model, a road surface model having a predetermined shape, an outermost surface model of a tire surrounding space having a predetermined shape, and a groove space model between the tire and the road surface determined by a tread pattern are combined. Generating a tire surrounding space model having wedge-shaped spaces before and after the tire;
Of tire surrounding space model including The step of generating the end face shape of the tire meridian cross section,
A predetermined tire shaft is set so that the contact length formed at the overlapping portion between the circle centered on the predetermined tire shaft position and the road surface is a contact length corresponding to each position in the tire width direction in the contact length data. Calculating the diameter of the circle for each position in the tire width direction based on the position-related data and the contact length data;
A method for generating a tire surrounding space model according to claim 3, comprising: generating an end face shape of a tire meridian section based on the calculated diameter.   The computer program which makes a computer perform the method of Claim 3 or 4.