JP2000242681A - Simulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve memory use efficiency by eliminating the need to structure a model each time a parameter value is changed by varying an object parameter value before simulation according to a list and initializing the parameter value at the end. SOLUTION: When the value of a parameter is already changed, a simulation starting means 110 implements a parameter initializing means 210 and implements a parameter changing means 220 so as to put the changed object parameter back into its initial state and then change parameters described in a parameter object. At the end of simulation by a simulation implementation part 300, a simulation end means 120 gathers results and when next simulation is performed, a return to the starting means 110 is made to repeat a similar process for a next parameter object in a change list. Consequently, continuous simulation is performed while arbitrary parameters of a model are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a simulation apparatus suitable for use in computer-aided design such as CAE.

[0002]

2. Description of the Related Art Conventionally, in computer-aided design such as CAE, there is a technique of giving various parameters to a numerical model (or logical model) describing a product to be designed in software and analyzing the behavior on a computer. Are known. For example, in the field of structural design, a wire frame model that models a structure is created, and this model is incorporated in a modal analysis program, and external force (vibration, etc.) applied to the model is given to the modal analysis program as a parameter. By running
The behavior of the model is simulated on a computer.

[0003]

However, such a conventional simulation apparatus has the following problems. (A) When a simulation with different parameter values is executed a plurality of times, a model corresponding to each parameter value must be prepared, which reduces the memory usage efficiency. Since it is necessary to prepare a model corresponding to each content, there is also a problem that it is not possible to simultaneously change parameters at a plurality of locations in the model and execute the simulation continuously. Therefore, the present invention has been made in view of such circumstances, and in addition to improving the memory use efficiency, a simulation apparatus capable of simultaneously changing parameters at a plurality of locations in a model and executing simulation continuously. It is intended to provide.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a parameter to be changed is changed according to a change list before execution of a simulation, while the parameter to be changed is changed at the end of the simulation. It is characterized by comprising parameter changing means for initializing a parameter value, and executing means for executing a simulation on the model based on a change target parameter value changed according to an instruction of the parameter changing means.

[0005] In the invention according to claim 2 dependent on claim 1, the parameter changing means lists parameter objects corresponding to keywords for uniquely specifying parameters to be changed by the number of times of execution. It is characterized in that a parameter value to be changed is specified with reference to a change list. Further, in the invention according to claim 3 dependent on claim 2, the parameter object is formed from all change target parameters changed in one simulation and the parameter values thereof. .

In the present invention, the parameter value to be changed is changed according to the change list before the simulation is executed, and the parameter value to be changed is initialized at the end of the simulation. Accordingly, the simulation can be executed while changing only the parameter value to be changed without preparing a plurality of models, and as a result, the memory use efficiency is improved. In addition, the parameter value to be changed is initialized each time the simulation is executed, and the simulation is executed while changing the parameter value to be changed according to the change list. Execution becomes possible.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. (1) Summary of the Invention According to the present invention, a simulation is executed by changing values of some parameters (hereinafter, referred to as change target parameters) of a simulation target model (hereinafter, simply referred to as a model) developed on a memory. At this time, without using a plurality of models, only the value of the parameter to be changed (hereinafter referred to as a parameter value to be changed) is changed in the apparatus and a simulation is executed, thereby improving the memory use efficiency. . Further, in the present invention, a group of all parameters of the model that are changed by one simulation execution is a list of combinations of keywords and parameter values that can uniquely specify the parameter to be changed (hereinafter referred to as a parameter object). ), And by listing parameter objects for the number of executions (this list is hereinafter referred to as a change list),
It is possible to change the value of a parameter to be changed at a plurality of places in a model when the model is executed a plurality of times.

(2) Overall Configuration Next, the configuration of a simulation apparatus according to an embodiment of the present invention will be described with reference to FIG. The simulation apparatus shown in FIG. 1 includes a simulation control unit 100 that controls the entire simulation, a parameter change unit 200 that changes a change target parameter value of the model M using a parameter object, and a simulation execution unit 300 that executes a simulation. Be composed. The simulation control unit 100 includes a simulation start unit 110 and a simulation end unit 1
20. The simulation start unit 110 sets parameter values before starting the simulation. The simulation ending means 120 stores the simulation result and displays the loop / result. The parameter changing unit 200 that initializes / changes a parameter value to be changed in the model includes a parameter initializing unit 210 and a parameter changing unit 220. Parameter initialization means 21
0 returns the parameter value of the model to be changed to the initial state, while the parameter changing means 220 changes the parameter value of the model to be changed according to the change list.

(3) Operation Next, with reference to FIGS. 2 to 8, the operation of each unit constituting the simulation apparatus having the above configuration will be described. 2. Operation of Simulation Control Unit 100 As shown in FIG. 2, the simulation control unit 100 first prepares for starting the simulation.
The current number of times indicating the current number of simulations is set to 1 (step S101). Then, the process proceeds to step S102, where the simulation starting means 11
Execute 0. Next, in step S103, the simulation is executed by calling the simulation execution unit 300. Finally, the process proceeds to step S104, where the simulation ending means 1 is used to perform post-simulation processing.
Execute 20.

Operation of Simulation Starting Unit 110 Next, referring to FIG.
Will be described. When the simulation start unit 110 is executed through the above-described step S102, the process first proceeds to step S111, and the current number is set to 1 in order to confirm whether or not the simulation is executed.
Check if it is. Here, if the current number is 1, the determination result is “YES”. In this case, since the model has not been changed yet and the parameter initialization means 210 does not need to be executed, step S1 is performed.
The process proceeds to step S13, and the parameter changing unit 220 is executed. On the other hand, if the current number is not 1, the result of the determination in step S111 is “NO”, and the
The process proceeds to step S12. In step S112, the parameter initializing means 210 is executed to return the parameter value to be changed of the model to the initial state, and thereafter, in step S1
Proceeding to 13, the parameter changing means 220 is executed to change the parameter value of the model to be changed.

Operation of Simulation Terminating Unit 120 Next, referring to FIG.
Will be described. Step S104 described above
Simulation end means 120 via (see FIG. 2)
Is executed, first, step S121 shown in FIG. 4 is executed, and the simulation result generated by executing the simulation is added to a result storage list (hereinafter, referred to as a result list). Then, the process proceeds to step S122 to check whether the current number of times is less than the total number of simulations indicating how many times to repeat the simulation.

If the number of simulations is less than the total number of simulations, the determination result is "YES", and step S123 is performed.
After the current number of times is incremented, the process proceeds to step S124, and the process returns to the simulation start unit 110 to perform the next simulation. On the other hand, if the total number of simulations is equal to or greater than the total number of simulations, the determination result of step S122 is “NO”, and the
The process proceeds to 125. In step S125, assuming that all simulations have been completed, the parameter initialization means 210 is executed to return the model to the initial state. Thereafter, the process proceeds to step S126, in which all simulation results in the result list are extracted and displayed. Note that the model is initialized at the end because the model is still changed immediately after the end of the simulation, which may cause inconvenience when the model is operated by another process of the simulation execution device. It is.

Next, the parameter initialization means 210 and the parameter change means 220 will be described. Before that, examples of parameter objects and change lists will be described. As shown in FIG. 5, a parameter object is a set of a keyword for uniquely specifying a parameter to be changed in a model and a parameter change value indicating a value to be changed, and the parameter to be changed at a time. Are listed, and all change target parameters and parameter change values that are changed in one simulation are collectively represented by one parameter object. As shown in FIG. 6, the change list is a list of the parameter objects by the number of times of simulation execution.

Next, the operation of the parameter initialization means 210 will be described with reference to FIG. Step S122 described above (FIG. 3
When the parameter initialization means 210 is executed through either step S126 (see FIG. 4) or step S126 (see FIG. 4), the process proceeds to step S211 shown in FIG. 7 to return the model parameters to the initial state. The parameter initial values saved in the memory at the time of the immediately preceding simulation are taken out. Next, in step S212, this parameter initial value is set to the parameter value to be changed of the model. Thereby, the parameters of the model return to the state before the simulation was started.

Operation of Parameter Changing Unit 220 Next, the operation of the parameter changing unit 220 will be described with reference to FIG. When the parameter changing unit 220 is executed via the above-described step S113 (see FIG. 3), the process first proceeds to step S221 shown in FIG. 8, and the parameter object corresponding to the current number of times is extracted from the change list. Take out. Then, the next step S2
In step 22, the initial value set in the parameter to be changed is extracted from the model according to the keyword in the extracted parameter object. Next, in step S223, the extracted value is stored in a memory as a parameter initial value, and the subsequent step S224
Then, the parameter change value in the parameter object is set as the parameter to be changed in the model. In this manner, by changing the model change target parameter value each time the simulation is repeated, it is possible to continuously execute the simulation using one model.

As described above, according to the simulation apparatus of the present invention, the simulation starting means 1
In step 10, if the parameter value has already been changed, the parameter initialization means 210 is executed to return the changed parameter value to be changed to the initial state.
The parameter changing unit 220 is executed to change a plurality of parameters described in the parameter object. Then, when the simulation executed by the simulation executing unit 300 ends, the simulation ending unit 120 collects the simulation result, and when executing the next simulation, returns to the simulation starting unit 110 again and returns to the next simulation start unit 110 in the change list. The same processing is repeated for parameter objects, so each time the value of a parameter is changed, a new model is not generated, and any parameters of the model (for example, the number of terminals, traffic volume, device performance values, etc.) Etc.) can be changed and simulation can be executed continuously. Also, no matter how many times the simulation is executed, the memory use efficiency is improved because there is only one model on the disk to be used as the simulation target.

[0017]

According to the present invention, the parameter value to be changed is changed according to the change list before the simulation is executed, and the parameter value to be changed is initialized at the end of the simulation, so that the memory use efficiency is improved. In addition, the simulation can be executed continuously by simultaneously changing the parameters at a plurality of locations in the model.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a simulation device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a simulation control unit 100.

FIG. 3 is a flowchart showing an operation of a simulation starting means 110.

FIG. 4 is a flowchart showing an operation of a simulation ending means 120.

FIG. 5 is a diagram showing a configuration of a parameter object.

FIG. 6 is a diagram showing a configuration of a change list.

FIG. 7 is a flowchart showing the operation of the parameter initialization means 210.

FIG. 8 is a flowchart showing the operation of the parameter changing means 220.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Simulation control unit 110 Simulation start unit 120 Simulation end unit 200 Parameter change unit 210 Parameter initialization unit 220 Parameter change unit 300 Simulation execution unit M model

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hideaki Suzuki 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa F term in NEC Information Systems Co., Ltd. 5B046 JA04 5B049 AA01 AA06 EE03 EE41 FF03 GG04 GG07

Claims (3)

[Claims] 1. A parameter changing means for changing a parameter value to be changed according to a change list before executing a simulation, and a parameter changing means for initializing the parameter value to be changed at the end of the simulation; Executing means for executing a simulation on the model based on the parameter value to be changed. 2. The method according to claim 1, wherein the parameter changing unit changes the parameter to be changed with reference to a change list in which parameter objects corresponding to keywords that uniquely specify the parameter to be changed are listed by the number of times of execution. The simulation device according to claim 1, wherein: 3. The simulation apparatus according to claim 2, wherein the parameter object is formed from all parameters to be changed in one simulation and the parameter values.