JP4997642B2 - Interference analyzer for flexible parts - Google Patents

Description

  The present invention relates to a deformation analysis apparatus for a flexible object that analyzes a deformation process of a flexible object accompanying movement of a specific part of the flexible object and displays the deformation process on a screen of an image display apparatus.

  As shown in FIG. 3, there are so-called flexible objects such as a hose 2 and a wire harness 3 in addition to a rigid body such as a battery B in the hood 1 of an automobile. Such a flexible object has an end portion fixed, but an intermediate portion is not fixed, and swings within a certain range due to engine vibration or the like.

  Conventionally, in the design stage of an automobile, a virtual trial has been performed assuming that a wire harness is installed. This is a database of requirements that allow interference between the wire harness and other components, link the wire prototype data on the virtual prototype with the database, measure the gap w with the mating part, and The procedure of comparing with requirements automatically examines interference at the virtual prototype stage, aiming to reduce actual vehicle problems due to missing or leaked evaluations and to reduce the number of items examined.

  Specifically, as shown in FIG. 4, when the evaluation is started (step S21), an evaluation target is input (step s22). In this step, the self part and the counterpart part are selected from the part data. To do. Subsequently, the type of the input own part is determined (step S23). The types of own parts include a wire, a tape, a corrugate, a sheet, a tube, and the like, and are determined by referring to member data. Then, the interference requirement database is called (step S24).

  Subsequently, the type of the counterpart part is determined (step S25). The types of mating parts are divided into sheet metal, edge, resin, spot, hose, etc., with different interference requirements. As shown in FIG. 5, the interference requirement database has a one-to-one correspondence between the requirements of the necessary gap between the own part and the counterpart part.

  Thereafter, the gap is calculated, that is, measured on the CAD data of the virtual prototype (step S26). This measurement result is compared with the corresponding numerical value in the interference requirement database (step S27). For example, if the interference requirement is 0 mm and the measurement result is 5 mm, the determination is OK. The result is output to the display (step S28). In this way, the evaluation ends (step S29).

For the simulation at the design stage of such an automobile, for example, the techniques of the following documents 1 to 3 are disclosed. Patent Document 2 discloses a wire harness evaluation device that can easily evaluate a wiring characteristic including a wiring shape and a reaction force when the supporting portion of the wire harness is moved on a screen by analysis using a finite element method. Has been.
Japanese Patent Laid-Open No. 2007-080132 Japanese Patent Laid-Open No. 2006-210323 Japanese Patent Laid-Open No. 2005-038398

  However, in the technique described above, calculation is performed with the wire harness as a rigid body. In other words, the clearance is measured on the assumption that the wire harness and the peripheral parts are always in the exact position, and the movable area of parts generally called soft objects such as hoses that swing due to engine vibration etc. is considered. Not done. For this reason, there has been a case in which an interference problem occurs at the stage when the actual vehicle driving test is actually performed. In addition, parts that cause such relative movement, that is, flexible parts such as hoses and wire harnesses, become a problem at the stage of interference regardless of the presence or absence of a protective material. Further, Patent Document 3 discloses a deformation of a flexible object that allows a deformation process of the entire flexible object to be analyzed when a specific part of the flexible object is moved to be analyzed with high accuracy by a finite element method and confirmed on a screen. Although an analysis device is disclosed, this is a method in which a human moves a wire harness virtually by a mouse operation and determines whether or not it hits another part. There may be an error in the results depending on the trajectory moved and the position moved.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an interference analysis apparatus that performs interference examination in consideration of a movable area in advance in a virtual trial production stage.

Interference analysis device of a flexible material component of the present invention includes an input unit for inputting select own component, interference requirements database and component database of spacing required between the various self-components and various other components of the The movable part and other parts of the flexible part whose base end is constrained as its own part based on the information called from the database, the storage part to be stored, the self part and other parts input by the input part as predicted the movable area of the flexible object part base end is restrained, performs measurement of the gap between the moving area of the flexible object parts, of the own component and the other components in the measurement result and interference requirements database And a display unit for displaying a comparison result by the processing unit.

  According to the interference analysis apparatus for flexible parts of the present invention, it is possible to reduce the examination process involving humans and to eliminate leakage due to an error during examination.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The automatic interference examination method of the present invention is a movable area of a so-called flexible object such as the hose 2 and the wire harness 3, specifically, between 2 a and 2 b of the hose 2 in FIG. 3 and between 3 a and 3 b in the case of the wire harness 3. This area is calculated by a wire harness movable range prediction method or geometric analysis based on CAE analysis or FEM analysis, or an area prediction method based on experimental values. In addition, as shown in FIG. 2, the automatic interference examination system of the present invention includes a display 5 as a display unit, a CPU 6 as a processing unit, a storage unit 7, and an input unit 4.

  Specifically, in the automatic interference examination method, as shown in FIG. 2, when the evaluation is started (step S11), an input column for the evaluation target is displayed on the display 5, and the input of the evaluation target is prompted (step S12). ). In this step, information on the flexible part to be evaluated is called out from the part data stored in the storage unit 7, and the operator selects and inputs his / her part. Here, when analyzing only interference with a specific counterpart component, the counterpart component is also selected and input.

  Subsequently, the type of the input self-part is determined, and a movable area prediction process is performed (step S13). The types of own parts include a wire, a tape, a corrugated sheet, a tube, and the like, and the CPU 6 discriminates this type by referring to a member database stored in the storage unit 7. Here, in addition to identification data and CAD data for each part, the database stores data such as physical properties, shapes, restraint positions, and restraint directions. Based on these data, the CPU 6 predicts the movable area of the wire harness that is its own part by a wire harness movable range prediction method such as conventional CAE analysis and FEM analysis, geometric analysis, or an area prediction method based on experimental values. .

  Thereafter, the interference requirement database stored in the storage unit 7 is called (step S14). For example, as shown in FIG. 5, the interference requirement database includes a wire, a tape, a corrugated tube, and the like that are displayed in the column direction heading, and a sheet metal and an edge that are displayed in the row direction heading. The requirements for the distance between the resin, the spot, etc. are compiled in a database. In the database shown in FIG. 5, for example, the requirement between the wire and the sheet metal is 10 mm, that is, the interval of 10 mm or more is the requirement, but the interval between the corrugate and the sheet metal is 0, and there is no gap. That's okay.

Subsequently, the type of the counterpart part is determined (step S15). Types of mating parts include sheet metal, edge, resin, spot, hose, etc.
And area prediction of vibration components, such as a hose, is performed (step S16). This prediction can be calculated by area prediction by FEM (finite element method), a geometric method, or an area prediction method by an experimental value.

  Thereafter, the CPU 6 measures the gap w on the virtual trial simulation (step S17). Subsequently, the measurement result is compared with the corresponding numerical value in the interference requirement database (step S18). For example, if the measurement result is 5 mm when the interference requirement is 0 mm, the determination is OK. If the measurement result is 0 mm when the interference requirement is 5 mm, the determination is NG. The result is output to the display 5 (step S19). In this way, the evaluation ends (step S20).

  As described above, according to the present invention, an area in which a flexible part such as a wire harness or a hose that swings or causes relative movement is predicted, and a gap or an interference degree is measured between the areas. Can detect interference problems due to rocking and relative motion that could not be detected. By doing so, it is possible to detect the problem of interference due to relative motion at the stage of virtual trial manufacture, so it is possible to reduce problems that occur when a real vehicle is prototyped. In addition, since the movable area is automatically examined, it is possible to reduce the examination process involving humans and to eliminate leakage due to an error during examination.

  As described above, the method for evaluating a wire harness according to the present invention includes a step of calling information on a flexible part to be evaluated, a step of calling a database storing interference requirements, and a movable area of the own part and the counterpart part. The movable area is automatically considered by including a step of predicting the gap, a step of calculating a gap between the movable areas of the own part and the counterpart part, and a step of comparing the calculated gap with the interference requirement data. The present invention can be implemented in various forms without departing from the spirit of the present invention.

It is a block diagram which shows the interference analysis apparatus of the flexible article components of this invention. It is a flowchart which shows the interference analysis method of the flexible component of this invention. It is a figure which shows the inside of the hood of a motor vehicle. It is a flowchart which shows the interference analysis method of the flexible parts of a prior art example. It is a table | surface which shows an interference requirement database.

Explanation of symbols

1 Bonnet 2 Hose 3 Wire harness 4 Input unit 5 Display 6 CPU
7 Memory B Battery w Space

Claims (2)

An input section for selecting and entering the own parts;
A storage unit for storing an interference requirement database and a database of parts at necessary intervals between various self-parts and various other parts ;
The type of the self part and the other part input by the input unit is determined, and based on the information called from the database , the movable area of the flexible part whose base end is constrained as the self part and the other part predicting a moving area of the flexible object part base end is restrained during these perform measurement of gap between the movable area of the flexible object components, the self-components and the other components in the measurement result and interference requirements database Processing means for comparing the required interval with
A display unit for displaying a comparison result by the processing means;
An apparatus for analyzing interference of flexible parts, comprising: The interference analysis apparatus according to claim 1, wherein the other component is input by the input unit.