JP6138631B2 - Apparatus, method and computer program for predicting tire vibration - Google Patents

Description

  The present invention relates to an apparatus, a method, and a computer program for predicting vibration generated in a tire rolling on a road surface.

  When the tire rolls on the road surface, a force is generated by the contact between the road surface and the tread pattern, the tire surface is raised, and the tire vibrates. It is desirable that such tire vibration can be predicted with high accuracy in analyzing road noise caused by the vibration, vibration transmitted to the vehicle body, and the like.

  Although it is possible to perform tire vibration response analysis in consideration of inertial force using a single tire model, the calculation cost becomes enormous and the analysis content becomes complicated, which is not practical.

  In Non-Patent Document 1, a rolling analysis is performed to calculate how the tire is vibrated by the tread pattern and the force generated on the road surface during rolling of the tire, that is, to calculate the input to the tire. After that, it is disclosed to perform a vibration response analysis resulting from the input obtained by the rolling analysis. As described above, if the rolling analysis and the vibration response analysis are separately performed with different tire models, it is considered useful for reducing the calculation cost and the complexity of the analysis.

"Radiation Noise Simulation of a Rolling Tire Excited by Tread Pattern", The Yokohama Rubber Co., Ltd, Kanagawa, Japan, Masataka Koishi, Toshiyuki Ikeda and Hiroshi Fujii, 2011 SIMULIA Customer Conference.

  The non-patent document 1 seems to disclose that the analysis is specifically performed as follows. First, a quasi-static rolling analysis is performed in which a tire model with a pattern rolls in a state where inertia force is not taken into consideration, and a contact pressure fluctuation on a tire tread is obtained. Next, a ground contact eigenvalue analysis is performed using a tire model for vibration response analysis, and modal parameters (eigenvalue, vibration mode) necessary for the vibration response analysis are obtained. Next, the ground pressure fluctuation is converted into displacement information at each contact of the vibration response analysis model. Next, the displacement information of the tire tread obtained above is set as a boundary condition, and a modal response analysis using the vibration response analysis model is performed.

  However, in the above method, since the displacement information of the tire tread is set as a boundary condition, the pattern vibration due to rolling is input by actually displacing the tire tread which is restrained by the road surface and does not vary. It is hard to say that the phenomenon is different from reality and an accurate vibration response is obtained.

  The present invention has been made paying attention to such a problem, and an object thereof is to provide a tire vibration prediction apparatus, method, and computer program in which accuracy is improved in accordance with a tire vibration mode in reality. It is.

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

  That is, the tire vibration prediction apparatus of the present invention rolls a tire finite element method model having a tread pattern under predetermined conditions including a predetermined load and a predetermined rotation speed, and applies vibration by contact between the tread pattern and a road surface. Displacement data of nodes on the observation line that is set at a position separated from the tread surface inward, which is an observation line that is set on the rubber member that forms the tread surface and the rolling analysis unit that calculates the deformation of the tire Obtained by the displacement data acquisition unit that extracts based on the rolling analysis result, the eigenvalue analysis unit that performs the ground eigenvalue analysis that acquires the eigenvalue and the vibration mode using the vibration response analysis model, and the displacement data acquisition unit. A displacement data converter for converting displacement data into displacement data of nodes on an input line corresponding to the observation line in the vibration response analysis model; Set the displacement data in the input line while restraining the tread condition, and a vibration response analyzing unit for performing a modal response analysis using the vibration response analysis model.

  The tire vibration prediction method of the present invention is a method executed by a computer, rolling a tire finite element method model having a tread pattern under predetermined conditions including a predetermined load and a predetermined rotation speed, and the tread pattern A step of calculating the deformation of the tire that is vibrated by contact with the road surface, and an observation line set on the rubber member forming the tread, on the observation line set at a position away from the tread Extracting the displacement data of the nodal point based on the rolling analysis result, performing the grounding eigenvalue analysis using the vibration response analysis model to acquire the eigenvalue and the vibration mode, and extracting the extracted displacement data from the vibration A step of converting into displacement data of a node on the input line corresponding to the observation line in the response analysis model; The setting the displacement data in the input line while restrained, comprising the steps of: performing modal response analysis using the vibration response analysis model.

  In order to facilitate analysis, the observation line is preferably a deck line that connects the groove bottoms of the grooves forming the tread pattern.

  In order to reduce the calculation cost, the vibration response analysis model is preferably a non-pattern tire model.

  In the present invention, the steps constituting the above method can be specified from the viewpoint of a program. That is, the computer program of the present invention causes a computer to execute each step constituting the tire vibration prediction method. By executing this program, the operational effects produced by the above method can be obtained.

The block diagram which shows the tire vibration prediction apparatus of this invention. The tire meridian sectional view which shows the member which comprises a tire. Explanatory drawing regarding the process in the contact part of the road surface and tire which concerns on this invention. The flowchart which shows a tire vibration prediction process. Explanatory drawing regarding the process in the contact part of the road surface and tire which concerns on the conventional method.

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

[Tire vibration prediction device]
A tire vibration prediction apparatus 1 according to the present invention is an apparatus that predicts vibrations generated in a tire rolling on a road surface. Specifically, as shown in FIG. 1, the apparatus 1 includes a tire model storage unit 10, a rolling analysis unit 11, a displacement data acquisition unit 12, an eigenvalue analysis unit 13, a displacement data conversion unit 14, and vibrations. A response analysis unit 15. Each of these units 11 to 15 is 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, a memory, various interfaces, and the like. Is done.

  The tire model storage unit 10 illustrated in FIG. 1 stores a tire finite element model having a tread pattern used for rolling analysis and a non-pattern tire model used for vibration response analysis. These tire models may be generated by the apparatus and stored in the storage unit 10 or may be input from the outside and stored in the storage unit 10. In the present embodiment, the tire model used for the vibration response analysis is a non-pattern model in which grooves are not formed in the tread portion, but is a tire model having a tread pattern in which grooves are formed in the tread portion. Also good.

  The rolling analysis unit 11 shown in FIG. 1 rolls a tire finite element model having a tread pattern stored in the storage unit 10 under predetermined conditions, and adds the tire finite element model by contact between the tread pattern and the road surface. A quasi-static rolling analysis is performed to calculate the deformation of the tire being shaken. The predetermined condition includes a predetermined load, a predetermined rotation speed, and a predetermined internal pressure. By this rolling analysis, the contact pressure generated by the contact with the road surface is calculated, and the deformation of the tire due to the pressure value is calculated along the time axis.

  FIG. 2 is a tire meridian cross-sectional view showing members constituting a general tire. As shown in FIG. 2, the tread rubber 20 forms a tread surface 20 a, and the belt layer 21, the carcass ply 22, and the inner liner 23 exist on the inner side in the tire radial direction of the tread rubber 20. The belt layer 21 and the carcass ply 22 are members in which a cord is topped with rubber. The inner liner 23 forms the tire inner surface 23a.

  As shown in FIGS. 2 and 3, the displacement data acquisition unit 12 shown in FIG. 1 is an observation line Li set on the rubber member 20 forming the tread 20a, and is set at a position away from the tread 20a inward. The displacement data of the nodes on the observed line Li is extracted based on the rolling analysis result by the rolling analysis unit 11. The obtained displacement data is data representing the displacement of each node along the time axis. In the present embodiment, the observation line Li is a deck line that connects the groove bottoms of the grooves 3, but is not limited thereto. The rubber member 20 may be disposed anywhere as long as the position avoids the tread surface 20a. That is, any part may be used as long as the observation line Li is set between the tread 20a and the belt layer 21 and on the rubber member 20. Preferably, the one closer to the tread surface 20a is less susceptible to the influence of the belt layer 21, which is preferable.

  The eigenvalue analysis unit 13 illustrated in FIG. 1 acquires modal parameters necessary for modal response analysis. Specifically, the eigenvalue analysis unit 13 performs a contact eigenvalue analysis that acquires the eigenvalue and the vibration mode using the vibration response analysis model stored in the tire model storage unit 10. The parameters used for the eigenvalue analysis are the same as the parameters (predetermined load, internal pressure) used in the rolling analysis.

  The displacement data converter 14 shown in FIG. 1 converts displacement data based on the rolling analysis model into displacement data in the vibration response analysis model. Specifically, as shown in FIG. 3, the displacement data conversion unit 14 converts the displacement data on the observation line Li obtained by the displacement data acquisition unit 12 into an input line corresponding to the observation line Li in the vibration response analysis model. It converts into the displacement data of the node on Li2. This is because the displacement data is data indicating the movement of each node constituting the model, but the two models need not be mapped to each other because the meshes (or nodes) are not always common. The observation line Li and the input line Li2 are defined in advance by the distance from the tread 20a.

  As shown in FIG. 3, the vibration response analysis unit 15 shown in FIG. 1 sets displacement data on the input line Li2 while constraining the tread 20a as a boundary condition, and performs a modal response analysis using a vibration response analysis model. . In the modal analysis, the parameters acquired by the eigenvalue analysis unit 13 are used. The tire vibration can be predicted from the result of the modal analysis.

[Tire vibration prediction method]
A method for predicting tire vibration using the apparatus 1 will be described with reference to FIG.

  First, in step S100, the rolling analysis unit 11 rolls a tire finite element method model having a tread pattern under predetermined conditions including a predetermined load and a predetermined rotation speed, and adds the tire finite element method model by contact between the tread pattern and the road surface. The deformation of the tire to be shaken is calculated.

  In the next step S101, the displacement data acquisition unit 12 is an observation line Li set on the rubber member 20 forming the tread 20a, and a node on the observation line Li set at a position away from the tread 20a inward. Is extracted based on the rolling analysis result.

  In the next step S102, the eigenvalue analysis unit 13 performs a ground eigenvalue analysis to acquire the eigenvalue and the vibration mode using the vibration response analysis model.

  In the next step S103, the displacement data conversion unit 14 converts the displacement data extracted by the displacement data acquisition unit 12 into displacement data of nodes on the input line Li2 corresponding to the observation line Li in the vibration response analysis model.

  In the next step S104, the vibration response analysis unit 15 sets displacement data on the input line Li2 while constraining the tread 20a as a boundary condition, and performs a modal response analysis using the vibration response analysis model.

  Here, in order to confirm the effect of the present invention, the following experiment was conducted. A test tire (size 195 / 65R15) on which a basic pattern was formed was rolled on a smooth drum at a predetermined internal pressure (200 kPa), a constant load (4.41 kN), and a constant speed (40 km / h). The amplitude value of the vertical vibration generated with respect to the shaft was measured. The result of predicting vibration using the method of the present embodiment was closer to the actual measurement value than the result of predicting vibration using the conventional method described in Non-Patent Document 1.

  According to the method of Non-Patent Document 1, as shown in FIG. 5, the tread 20a is vibrated by rolling in the rolling analysis model, and the contact pressure generated on the tread 20a is converted into displacement data of the tread 20a. Displacement data is input to the tread surface 20a of the vibration response analysis model. In this method, since the tread surface 20a of the vibration response analysis model is displaced, in reality, the tread surface 20a that is supposed to be constrained by the road surface rs is deformed, and an accurate vibration response can be obtained. I can't say.

  On the other hand, in the present invention, as shown in FIG. 3, using the rolling analysis model, the displacement data of the observation line Li set at a position farther inside the tire than the tread surface 20a is acquired, and this displacement data is acquired. Is input to the input line Li2 of the vibration response model, the tire tread 20a can be constrained, the state of the tire tread 20a can be reproduced as in reality, and the prediction accuracy can be improved.

  As described above, the tire vibration prediction device 1 of the present embodiment rolls the tire finite element method model having a tread pattern under a predetermined condition including a predetermined load and a predetermined rotation speed, and the tread pattern and the road surface rs. The rolling analysis unit 11 that calculates the deformation of the tire that is vibrated by the contact between the two and the observation line Li that is set on the rubber member 20 that forms the tread 20a, is set at a position away from the tread 20a inward. Displacement data acquisition unit 12 that extracts the displacement data of the nodes on the observation line Li based on the rolling analysis result, and the eigenvalue analysis unit that performs the ground eigenvalue analysis that acquires the eigenvalue and the vibration mode using the vibration response analysis model 13 and the displacement data obtained by the displacement data acquisition unit 12 are used to change the node on the input line Li2 corresponding to the observation line Li in the vibration response analysis model. A displacement data converter 14 for converting data, a vibration response analyzer 15 for setting displacement data on the input line Li2 while constraining the tread 20a as a boundary condition, and performing a modal response analysis using a vibration response analysis model; Is provided.

  Further, the tire vibration prediction method of the present embodiment is a method executed by a computer, rolling a tire finite element method model having a tread pattern under a predetermined condition including a predetermined load and a predetermined rotation speed, The step (S100) of calculating the deformation of the tire that is vibrated by the contact between the tread pattern and the road surface rs, and the observation line Li set in the rubber member 20 that forms the tread surface 20a, are separated inward from the tread surface 20a. A step of extracting displacement data of a node on the observation line Li set at a position based on the result of rolling analysis (S101), and a grounding eigenvalue analysis for acquiring eigenvalues and vibration modes using a vibration response analysis model. The input line Li corresponding to the observation line Li in the step (S102) and the extracted displacement data in the vibration response analysis model The step of converting to the displacement data of the upper node (S103), the step of setting the displacement data on the input line Li2 while constraining the tread 20a as the boundary condition, and performing the modal response analysis using the vibration response analysis model (S104) ) And.

  Thus, since the displacement data of the observation line Li set inside the tire tread 20a is acquired and the displacement data is input to the corresponding input line Li2 of the vibration response analysis model, the actual fact that the tread 20a is constrained. Boundary conditions that match the phenomenon can be set, and prediction accuracy can be improved.

  In the present embodiment, the observation line Li is a deck line that connects the groove bottoms of the grooves 3 forming the tread pattern. Although it is considered that the observation line Li is closer to the tread surface 20a as much as possible, the accuracy is higher. However, if the observation line Li is closer to the tread surface 20a than the deck line, there is an area where the rubber member 20 does not exist due to the groove 3, and displacement data of the area is obtained. Interpolation must be performed, and special processing may be required for analysis. If it is a deck line, since there is the rubber member 20 in the entire region, it is preferable in terms of easy analysis.

  In the present embodiment, since the vibration response analysis model is a non-pattern tire model, the calculation cost can be reduced as compared with a tire model having a tread pattern.

The computer program which concerns on this embodiment is a program which makes a computer perform each step which comprises the said tire vibration prediction method.
By executing these programs, it is possible to obtain the operational effects of the above method. In other words, it can be said that the above method is used.

  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.

  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.

DESCRIPTION OF SYMBOLS 11 ... Rolling analysis part 12 ... Displacement data acquisition part 13 ... Eigen value analysis part 14 ... Displacement data conversion part 15 ... Vibration response analysis part 20 ... Rubber member 20a ... Tread surface 3 ... Groove rs ... Road surface Li ... Observation line Li2 ... Input line

Claims (7)

Rolling analysis that calculates the deformation of a tire that is vibrated by contact between the tread pattern and a road surface by rolling a tire finite element method model having a tread pattern under predetermined conditions including a predetermined load and a predetermined rotation speed. And
Displacement data acquisition for extracting the displacement data of the nodes on the observation line set on the rubber member forming the tread surface, which is set at a position away from the tread surface, based on the rolling analysis result And
An eigenvalue analysis unit that performs ground contact eigenvalue analysis to acquire eigenvalues and vibration modes using a vibration response analysis model;
A displacement data conversion unit that converts displacement data obtained by the displacement data acquisition unit into displacement data of nodes on an input line corresponding to the observation line in the vibration response analysis model;
A vibration response analysis unit that sets the displacement data in the input line while constraining the tread as a boundary condition, and performs a modal response analysis using the vibration response analysis model;
A tire vibration prediction apparatus comprising:   The tire vibration prediction device according to claim 1, wherein the observation line is a deck line that connects the groove bottoms of the grooves forming the tread pattern.   The tire vibration prediction device according to claim 1, wherein the vibration response analysis model is a non-pattern tire model. A method performed by a computer,
Rolling a tire finite element method model having a tread pattern under predetermined conditions including a predetermined load and a predetermined rotation speed, and calculating a deformation of the tire that is vibrated by contact between the tread pattern and a road surface;
A step of extracting the displacement data of the nodes on the observation line set on the rubber line forming the tread surface, which is set at a position away from the tread surface, based on the rolling analysis result;
Performing ground contact eigenvalue analysis to obtain eigenvalue and vibration mode using the vibration response analysis model;
Converting the extracted displacement data into node displacement data on an input line corresponding to the observation line in the vibration response analysis model;
Setting the displacement data in the input line while constraining the tread as a boundary condition, and performing a modal response analysis using the vibration response analysis model;
Tire vibration prediction method including   The tire vibration prediction method according to claim 4, wherein the observation line is a deck line that connects groove bottoms of the grooves forming the tread pattern.   The tire vibration prediction method according to claim 4 or 5, wherein the vibration response analysis model is a non-pattern tire model.   The computer program which makes a computer perform each step which comprises the tire vibration prediction method in any one of Claims 4-6.

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