Simulation system, method, program and record medium

• US 20030078762A1
• Filed: 12/13/2001
• Published: 04/24/2003
• Est. Priority Date: 07/19/2001
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sato, Yuichi, Hashima, Masayoshi, Senta, Yosuke
• Application Number:
  US10/013,450
• Publication Number:
  US 20030078762A1
• Time in Patent Office: Days
• US Class Current: 703/13
• CPC Class Codes: G05B 2219/49029 Virtual rapid prototyping, create a virtual prototype, simulate rapid prototyping process
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30

Abstract

A virtual mechanism model simulation device constructs a virtual mechanism model of a mechanism device, and allows the model to run by performing simulating calculation based on the input data from a built-in software execution device. The virtual mechanism model simulation device comprises a first processing unit to make input/output to/from the built-in software execution device and execute mechanism operation of the virtual mechanism model, and a second processing unit to execute drawing processing of the virtual mechanism model using the free time of the first processing unit.

Claims

1. A simulation system comprising:

a built-in software execution device which executes a control program to control a mechanism device; and

a simulation device which constructs a virtual mechanism model of said mechanism device, said simulation device allowing said virtual mechanism model to run by simulation calculations which depend on input data from said built-in software execution device;

said simulation device including;

a first processing unit which executes a first processing on input/output to/from said built-in software execution device and on mechanism operations of said virtual mechanism model; and

a second processing unit which executes a second processing on a user interface including drawing of said virtual mechanism model, using a free time of said first processing unit.

2. The system according to claim 1, wherein

said simulation device includes two processors so that said first processing unit and said second processing unit are separately implemented so as to execute in parallel said input/output and mechanism operations by said first processing unit and said drawing processing by said second processing.

3. The system according to claim 1, wherein

said first processing unit and said second processing unit are implemented in multitasking on said processors of said simulation device, said input/output and mechanism operations by said first processing unit being executed in a short cycle with a higher priority given to the task, said drawing processing by said second processing unit being executed in a long cycle with a lower priority given to the task.

4. The system according to claim 3, wherein

said system allows said processing of said first processing unit to be executed in a given cycle by synchronizing with a timer counter.

5. The system according to claim 1, wherein

said mechanism device includes a motor which uses a pulsed signal or a sinusoidal wave signal as its input, said simulation device allowing said virtual mechanism model to run by receiving a pulsed signal or sinusoidal wave signal to the motor, in the form of a motor command from said built-in software execution device.

6. The system according to claim 1, wherein

said second processing unit executes said drawing processing for moving parts of said virtual mechanism model.

7. The system according to claim 1, wherein

said simulation device further includes a third processing unit which converts, for display, at least one of equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load applied to an axis that is optionally selected from the relation of a predefined driving mechanism, into a value viewed from said selected axis.

8. The system according to claim 7, wherein

said simulation device further includes a third processing unit which calculates and displays, in real time, a motor drive torque required for action, using equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load, viewed from a motor drive shaft, applied to an axis which is optionally selected based on the relation of a predefined drive mechanism.

9. The system according to claim 8, wherein

said simulation device implements a torque motor for input data from said built-in software execution device, to thereby allow said virtual mechanism model to run.

10. The system according to claim 9, wherein

at every predetermined simulation cycle, said simulation device repeats processings which include:

finding a target torque of a torque motor from command input data of said built-in software execution device;

finding equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load, viewed from a drive shaft of said torque motor; and

finding the amount of displacement of said motor, from the obtained target torque, equivalent inertia, equivalent static friction and equivalent dynamic friction, so as to update the displacement of said motor.

11. The system according to claim 1, wherein

said simulation device stores input data from said built-in software execution device during simulation, together with time data, said simulation device replaying simulation again, using the stored data, after simulation.

12. A simulation method which constructs a virtual mechanism model of a mechanism device and which allows said virtual mechanism model to run by means of simulation calculations which depend on input data from a built-in software execution device, said method comprising:

a first processing step which includes executing a first processing on input/output to/from said built-in software execution device and on mechanism operations of said virtual mechanism model; and

a second processing step which includes executing a second processing on a user interface including drawing of said virtual mechanism model, by use of a free time of said first processing step.

13. The method according to claim 12, wherein

said simulation device includes two processors so as to execute in parallel said input/output and mechanism operations by said first processing step, and said drawing processing by said second processing step.

14. The method according to claim 12, wherein

said first processing step and said second processing step are implemented in multitasking on said processors of said simulation device, said input /output and mechanism operations by said first processing step being executed in a short cycle with a higher priority given to the task, said drawing processing by said second processing step being executed in a long cycle with a lower priority given to the task.

15. The method according to claim 12, wherein

said processing of said first processing step is executed in a given cycle by synchronizing with a timer counter.

16. The method according to claim 12, wherein

said mechanism device includes a motor which uses a pulsed signal or a sinusoidal wave signal as its input, said simulation device allowing said virtual mechanism model to run by receiving a pulsed signal or sinusoidal wave signal to the motor, in the form of a motor command from said built-in software execution device.

17. The method according to claim 12, wherein

said second processing step includes executing said drawing processing for moving parts of said virtual mechanism model.

18. The method according to claim 12, further comprising:

a third processing unit which includes converting, for display, at least one of equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load applied to an axis that is optionally selected from the relation of a predefined driving mechanism, into a value viewed from said selected axis.

19. The method according to claim 12, further comprising:

a third processing step which includes calculating and displaying, in real time, a motor drive torque required for action, by use of equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load, viewed from a motor drive shaft.

20. The method according to claim 19, wherein

a torque motor is implemented for input data from said built-in software execution device, to thereby allow said virtual mechanism model to run.

21. The method according to claim 20, wherein

at every predetermined simulation cycle, said simulation device repeats processings which include:

finding a target torque of a torque motor from command input data of said built-in software execution device;

finding equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load, viewed from a drive shaft of said torque motor; and

finding the amount of displacement of said motor, from the obtained target torque, equivalent inertia, equivalent static friction and equivalent dynamic friction, so as to update the displacement of said motor.

22. The method according to claim 12, wherein

said simulation device stores input data from said built-in software execution device during simulation, together with time data, said simulation device replaying simulation again, using the stored data, after simulation.

23. A program allowing a computer to execute:

a first processing step which includes executing a first processing on input/output to/from said built-in software execution device and on mechanism operations of said virtual mechanism model; and

a second processing step which includes executing a second processing on a user interface including drawing of said virtual mechanism model, by use of a free time of said first processing step.

24. The program according to claim 23, wherein

said program allows two computers to execute, in parallel, said input/output and mechanism operations by said first processing step, and said drawing processing by said second processing step.

25. The program according to claim 23, wherein

said program allows said computer to implement said first processing step and said second processing step in multitasking on said computer processors of said simulation device, so that said input/output and mechanism operations by said first processing step are executed in a short cycle with a higher priority given to the task, and that said drawing processing by said second processing step is executed in a long cycle with a lower priority given to the task.

26. The program according to claim 25, wherein

said program allows said processing of said first processing step to be executed in a given cycle by synchronizing with a timer counter.

27. The program according to claim 23, wherein

said program allows said virtual mechanism model to run by feeding a pulsed signal or a sinusoidal wave signal in the form of a motor command from said built-in software execution device, to a motor which uses said pulsed signal or sinusoidal wave as its input.

28. The program according to claim 23, wherein

said program allows said drawing processing in said second processing step to be executed for moving parts of said virtual mechanism model.

29. The program according to claim 23, wherein

said program further allows said computer to execute a third processing step which includes converting, for display, at least one of equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load applied to an axis that is optionally selected from the relation of a predefined driving mechanism, into a value viewed from said selected axis.

30. The program according to claim 29, wherein

said program further allows said computer to execute a third processing step which includes calculating and displaying, in real time, a motor drive torque required for action, by use of equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load, viewed from a motor drive shaft.

31. The program according to claim 30, wherein

said program allows said virtual mechanism model to run by implementing a torque motor for input data from said built-in software execution device.

32. The program according to claim 31, wherein

at every predetermined simulation cycle, said program allows said computer to repeat processings which include:

finding a target torque of a torque motor from command input data of said built-in software execution device;

finding equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load, viewed from a drive shaft of said torque motor; and

finding the amount of displacement of said motor, from the obtained target torque, equivalent inertia, equivalent static friction and equivalent dynamic friction, so as to update the displacement of said motor.

33. The program according to claim 31, wherein

said program allows said computer to store input data from said built-in software execution device during simulation, together with time data and replay simulation again, using the stored data, after simulation.

34. A program allowing a computer to execute:

a step which includes executing processing on input/output to/from a built-in software execution device, and on mechanism operations of a virtual mechanism model, and on a user interface including drawing of said virtual mechanism model; and

a step which includes converting and displaying in real time at least one of equivalent inertia, equivalent static friction and equivalent dynamic friction of the total load applied to an axis which is optionally selected, from the relation of a predefined drive mechanism, into a value viewed from the selected axis, said step including calculating and displaying in real time a motor drive torque required for action, by use of the obtained equivalent inertia, equivalent static friction and equivalent dynamic friction.

35. A computer readable record medium having a program stored therein, said program allowing said computer to execute:

a first processing step which includes executing a first processing on input/output to/from a built-in software execution device, and on mechanism operations of a virtual mechanism model; and

a second processing step which includes executing a second processing on a user interface including drawing of said virtual mechanism model, by use of a free time of said first processing step.