JP2012063949A - Simulation method, system, and program of tire wear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately simulate for the wear of each tire.SOLUTION: The simulation method for the tire wear includes: creating a tire model, which has a finite number of elements, for each of a plurality of tires mounted on a vehicle (Step 100); setting simulation conditions for the rolling motion analysis of the tire model (Step 102); performing the rolling motion analysis of the tire model based on the simulation conditions and obtaining tire property data on the lateral force and longitudinal force developed in the tire (Step 104); calculating forces applying on the tire based on the tire property data and vehicle input data on the lateral and longitudinal force developed in the vehicle which are measured in driving the vehicle on a predetermined travel course (Step 108); calculating wear amount based on the forces applying on the tire (Step 110); and modifying the tire model based on the wear amount (Step 112).

Description

  The present invention relates to a tire wear simulation method, apparatus, and program, and more particularly, to a tire wear simulation method, apparatus, and program for simulating the progress of wear in a tire such as a pneumatic tire used in an automobile or the like.

  Conventionally, in tire development such as pneumatic tires, tire wear has been obtained by actually designing and manufacturing tires and actually measuring wear caused by running on a car, but in recent years it has become a finite element. With the development of numerical analysis techniques such as the law and the computer environment, it has become possible to calculate the tire shape and the like with a computer in consideration of the tire internal pressure filling state and the load state.

  For example, as a technique that enables calculation of tire performance using a computer, a technique of modeling a tire shape and simulating traveling is known (see, for example, Patent Documents 1 to 4). This technique uses a tire finite element model to perform a running simulation according to a running condition including a friction coefficient.

JP 2006-21648 A JP 2005-263070 A JP 2005-271661 A JP 2006-160159 A

  However, in the above-described prior art, no consideration is given to the position where the tire is attached to the front, rear, left or right of the automobile. Actually, the amount of wear differs because the force applied to each wheel differs depending on the driving method (front wheel drive, rear wheel drive, four-wheel drive) of the automobile.

  For example, if the right and left wheels have uneven wear on the right shoulder part of the traveling direction and the right wheel only when the shoulder part on the right side in the traveling direction has uneven wear, the right and left wheel force sharing rates are different. The degree of progression of uneven wear is also different.

  Therefore, the conventional technology has a problem that it is impossible to simulate tire wear with high accuracy.

  An object of the present invention is to obtain a tire wear simulation method, apparatus, and program capable of accurately simulating wear for each tire in consideration of the above facts.

  In order to achieve the above object, a tire wear simulation method according to claim 1 is a step of creating a tire model in which a tire is divided into a finite number of elements for each of a plurality of tires mounted on a vehicle. And, for each of the plurality of tires, a step of setting a simulation condition relating to a rolling analysis of the tire model, and for each of the plurality of tires, performing a rolling analysis of the tire model based on the simulation condition, Obtaining tire characteristic data relating to lateral force and longitudinal force generated in the tire; and for each of the plurality of tires, the tire characteristic data and a vehicle measured when the vehicle travels a predetermined traveling course. Calculating the force applied to the tire based on the vehicle input data relating to the lateral force and the longitudinal force generated; and For each of the plurality of tires, calculating the amount of wear of the tire based on the force applied to the tire; for each of the plurality of tires, correcting the tire model based on the amount of wear; It is characterized by including.

  A tire wear simulation apparatus according to a second aspect of the present invention includes a creation unit that creates a tire model in which a tire is divided into a plurality of finite elements for each of a plurality of tires mounted on a vehicle; And setting means for setting a simulation condition relating to the rolling analysis of the tire model, and a lateral force generated in the tire by executing the rolling analysis of the tire model based on the simulation condition for each of the plurality of tires. And an acquisition means for acquiring tire characteristic data relating to the longitudinal force, for each of the plurality of tires, the tire characteristic data, a lateral force generated in the vehicle measured when the vehicle has traveled a predetermined traveling course, and For each of the plurality of tires, force calculating means for calculating the force applied to the tire based on vehicle input data relating to longitudinal force, Wear amount calculation means for calculating the wear amount of the tire based on the force applied to the tire, and correction means for correcting the tire model based on the wear amount for each of the plurality of tires. It is characterized by that.

  A tire wear simulation program according to a third aspect of the invention includes a step of creating a tire model in which a tire is divided into a plurality of finite elements for each of a plurality of tires mounted on a vehicle, and for each of the plurality of tires. A step of setting simulation conditions related to the rolling analysis of the tire model, and a lateral force generated in the tire and the front and rear generated by performing the rolling analysis of the tire model based on the simulation conditions for each of the plurality of tires. Obtaining tire characteristic data relating to force, and, for each of the plurality of tires, relating to the tire characteristic data and lateral force and longitudinal force generated in the vehicle measured when the vehicle travels on a predetermined traveling course. Calculating a force applied to the tire based on vehicle input data; and for each of the plurality of tires The computer includes a process including a step of calculating a wear amount of the tire based on a force applied to the tire, and a step of correcting the tire model based on the wear amount for each of the plurality of tires. It is characterized by being executed.

  According to these inventions, the rolling analysis is executed for each tire, the force generated in each tire is simulated, the amount of wear is calculated for each tire, and the tire model is corrected, so the tire wear is simulated accurately. can do.

  According to the present invention, there is an effect that the wear can be accurately simulated for each tire.

It is the schematic of the personal computer for implementing performance prediction of a tire. It is a schematic block diagram of a computer. It is a flowchart of a tire performance simulation program. It is a perspective view of a tire model.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an outline of a personal computer as a tire performance simulation apparatus for creating a tire model of a pneumatic tire and performing performance prediction as an example. This personal computer includes a keyboard 10 for inputting data, a computer 12 for creating a three-dimensional tire model and predicting performance according to a pre-stored processing program, calculation results and various screens by the computer 12, and the like. A display 14 to be displayed and a mouse 16 for performing an operation of moving a cursor displayed on the display 14 to a desired position, selecting, deselecting, or dragging a menu item or an object at the cursor position. It is configured to include.

  As shown in FIG. 2, the computer 12 includes a CPU (Central Processing Unit) 12A, a ROM (Read Only Memory) 12B, a RAM (Random Access Memory) 12C, a non-volatile memory 12D, and an input / output interface (I / O) 12E. Are connected to each other via a bus 12F.

  Connected to the I / O 12E are a keyboard 10, a display 14, a mouse 16, a hard disk 18, and a CD-ROM drive 21 into which a CD-ROM 20 as a recording medium can be inserted and removed.

  The hard disk 18 stores a tire performance simulation program, which will be described later, and various parameters and data necessary for the execution thereof. The CPU 12A reads and executes a tire performance simulation program stored in the hard disk 18.

  Note that a tire performance simulation program, which will be described later, can be read from the CD-ROM 20 using, for example, the CD-ROM drive 21, so that a tire performance simulation program, which will be described later, is recorded in the CD-ROM 20 in advance. The tire performance simulation program recorded on the CD-ROM 20 via the CD-ROM drive 21 may be read and executed.

  Further, the recording medium is not limited to the CD-ROM, but includes an optical disk such as a DVD-ROM and a magneto-optical disk such as MD and MO. When these are used, the CD-ROM drive 21 is replaced with a DVD-ROM. A ROM drive, MD drive, MO drive or the like may be used.

  Next, as a function of the present embodiment, a processing routine of a tire performance simulation program executed by the computer 12 will be described with reference to a flowchart shown in FIG.

  In the present embodiment, a case where the wear of each tire of four wheels of a passenger car is simulated will be described as an example.

  In step 100, a tire model creation process for each tire to be simulated is performed. That is, a tire model is created based on a design plan (tire shape, structure, material, etc.) of a tire to be simulated. In the present embodiment, as an example, the same tire model is used for the front, rear, left and right wheels. For this reason, it is sufficient to create one tire model. In addition, you may create a tire model separately.

  The creation of the tire model differs slightly depending on the numerical analysis method used. In this embodiment, a finite element method (FEM) is used as a numerical analysis method. Therefore, the tire model to be created is divided into a plurality of elements by element division corresponding to the finite element method (FEM), for example, mesh division, and the tire is divided into a computer program created based on a numerical / analytical method. This is a numerical value in the input data format. This element division means dividing an object such as a tire and a road surface into several small (finite) small parts. After calculating every small part and calculating all the small parts, the whole response can be obtained by adding all the small parts. Note that a difference method or a finite volume method may be used as a numerical analysis method.

  For example, a tire model is created by creating a two-dimensional model of a tire cross section and then developing the tire model by one turn in the circumferential direction to create a three-dimensional (3D) model of the tire. An example of the three-dimensional model of the tire created in this way is shown in FIG.

  In step 102, simulation conditions are set. The simulation conditions include boundary conditions such as internal pressure and load. Other simulation conditions include acceleration and slip angle. That is, by setting the acceleration, it is possible to simulate the force generated in each tire when the vehicle is accelerated or decelerated. By setting the slip angle, each tire is turned when the vehicle is turned. Can be simulated.

  In the present embodiment, rolling analysis is performed for each tire by changing a plurality of predetermined conditions, that is, acceleration and slip angle, and the lateral force and longitudinal force generated in each tire are simulated under each condition. .

  In the next step 104, tire rolling analysis is executed. This rolling analysis is to analyze a change when the tire in contact with the road surface is rotated, that is, a deformation of the tire shape. For this rolling analysis, a rolling analysis method based on a known finite element method can be used.

  By this rolling analysis, it is possible to acquire data on lateral force and longitudinal force generated in each tire.

  In step 106, it is determined whether or not the rolling analysis of step 104 has been executed under a plurality of predetermined conditions. That is, it is determined whether or not the rolling analysis has been executed with a plurality of predetermined accelerations and slip angles. If the rolling analysis is executed under all the predetermined conditions, the process proceeds to step 108. If the rolling analysis is not executed under all the predetermined conditions, the process proceeds to step 102. Then, the acceleration and slip angle settings are changed, and rolling analysis is executed in step 104.

  As described above, by performing rolling analysis for each tire while changing the acceleration and the slip angle, it is possible to acquire the data of the lateral force and the longitudinal force corresponding to each condition of the acceleration and the slip angle for each tire. Hereinafter, this data is referred to as tire characteristic data.

  In step 108, a force input (applied) to each tire is calculated based on the tire characteristic data and the vehicle input data. This can be obtained by performing rolling analysis using known vehicle behavior analysis software.

  Here, the vehicle input data is data of the lateral force and the longitudinal force detected by the sensor when a vehicle equipped with a sensor for detecting the lateral force and the longitudinal force is caused to travel on a predetermined simulation target traveling course. It is.

  The longitudinal force and lateral force generated in the tire vary depending on the road surface condition. For example, the front / rear force and the lateral force generated on the tire are different on a road surface with a lot of straight running such as an expressway, a road surface with a lot of up / down running such as a slope, and a road surface with a lot of cornering running such as an urban area.

  Therefore, rolling analysis is performed by vehicle behavior analysis shift using the vehicle input data corresponding to the nature of the traveling course, and the force input to each tire is simulated, so that the tires when traveling on the traveling course to be simulated are simulated. It is possible to simulate wear with high accuracy.

  In addition, when performing rolling analysis using vehicle behavior analysis software, simulation conditions such as the vehicle drive method (front wheel drive, rear wheel drive, four wheel drive), the distance from the center of gravity of the vehicle to each tire are set. . Thereby, the difference in the share of the force input to each tire due to the difference in the driving method and the position of the tire is reflected in the rolling analysis result, and the force input to each tire can be accurately simulated.

  In step 110, based on the force input to each tire obtained in step 108, the amount of wear at each node of each tire model of each tire is calculated. For the calculation of the wear amount, for example, a method described in Japanese Patent Application No. 2009-85099 filed by the present applicant can be used.

  In step 112, the tire model of each tire is corrected to a tire model that is cut by the wear amount of each node obtained in step 112. That is, the coordinates of each node are moved by a distance corresponding to the wear amount.

  In the next step 114, it is determined whether or not a predetermined end condition is satisfied. If the end condition is satisfied, the process proceeds to step 116. If the end condition is not satisfied, the process returns to step 102 and the same as above. Repeat the process.

  The end condition may be, for example, a case where the wear amount becomes a predetermined wear amount, but the example of the end condition is an example and is not limited to the above example.

  In step 116, the above calculation result is output. As an example of the calculation result, there is display data for displaying the finally corrected tire model. With this display data, it is possible to display an image for grasping the state of stress distribution and wear energy distribution for a tire that shifts with time.

  As described above, in this embodiment, the rolling analysis is performed for each of the front, rear, left, and right tires, and the tire model is corrected by calculating the amount of wear for each tire by simulating the force generated in each tire. Tire wear can be simulated with high accuracy.

  In the present embodiment, the case of simulating a four-wheeled passenger car has been described. Needless to say, the present invention can also be applied to a four-wheel or more vehicle such as a six-wheel truck.

10 Keyboard 12 Computer 14 Display 16 Mouse 18 Hard Disk 20 Tire 21 CD-ROM Drive

Claims (3)

Creating a tire model by dividing the tire into a finite number of elements for each of a plurality of tires mounted on the vehicle;
For each of the plurality of tires, setting simulation conditions for rolling analysis of the tire model;
For each of the plurality of tires, performing a rolling analysis of the tire model based on the simulation conditions to obtain tire characteristic data relating to lateral force and longitudinal force generated in the tire;
For each of the plurality of tires, based on the tire characteristic data and vehicle input data relating to lateral force and longitudinal force generated in the vehicle measured when the vehicle travels on a predetermined traveling course, the tire Calculating the force applied to
For each of the plurality of tires, calculating a wear amount of the tire based on a force applied to the tire;
Correcting the tire model based on the amount of wear for each of the plurality of tires;
Tire wear simulation method including Creating means for creating a tire model in which a tire is divided into a plurality of finite elements for each of a plurality of tires mounted on a vehicle;
Setting means for setting simulation conditions for rolling analysis of the tire model for each of the plurality of tires;
An acquisition means for executing a rolling analysis of the tire model based on the simulation conditions for each of the plurality of tires and acquiring tire characteristic data relating to lateral force and longitudinal force generated in the tire;
For each of the plurality of tires, based on the tire characteristic data and vehicle input data relating to lateral force and longitudinal force generated in the vehicle measured when the vehicle travels on a predetermined traveling course, the tire Force calculating means for calculating the force applied to
For each of the plurality of tires, a wear amount calculating means for calculating a wear amount of the tire based on a force applied to the tire;
Correction means for correcting the tire model based on the wear amount for each of the plurality of tires;
Tire wear simulation device equipped with. Creating a tire model by dividing the tire into a finite number of elements for each of a plurality of tires mounted on the vehicle;
For each of the plurality of tires, setting simulation conditions for rolling analysis of the tire model;
For each of the plurality of tires, performing a rolling analysis of the tire model based on the simulation conditions to obtain tire characteristic data relating to lateral force and longitudinal force generated in the tire;
For each of the plurality of tires, based on the tire characteristic data and vehicle input data relating to lateral force and longitudinal force generated in the vehicle measured when the vehicle travels on a predetermined traveling course, the tire Calculating the force applied to
For each of the plurality of tires, calculating a wear amount of the tire based on a force applied to the tire;
Correcting the tire model based on the amount of wear for each of the plurality of tires;
A tire wear simulation program for causing a computer to execute a process including:

Images