Simulation method and apparatus for manipulator apparatus, simulation and control method and apparatus for manipulator apparatus, and control method and apparatus for manipulator apparatus

• US 5,526,254 A
• Filed: 02/04/1994
• Issued: 06/11/1996
• Est. Priority Date: 06/05/1992
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Uchiyama, Takashi, Nagashima, Fumio, Maruyama, Tsugito, Sato, Yuichi, Hirata, Mitsunori
• Primary Examiner(s): Trammell, James P.
• Application Number:
  US08/193,076
• Time in Patent Office: 858 Days
• Field of Search: 364/167.01, 364/424.02, 364/578, 318/560-568.25, 901/1, 901/2, 901/3, 901/8, 901/9, 901/14-26, 395/80-99
• US Class Current: 700/56
• CPC Class Codes: B25J 9/1671 characterised by simulation, either to verify existing program or to create and verify new program, CAD/CAM oriented, graphic oriented programming systems

Abstract

The present invention relates to a simulation or control method and apparatus for a manipulator apparatus and makes it possible to calculate three-dimensional dynamics of the entire manipulator apparatus on the real time basis using the laws of conservation of momentum/angular momentum of the entire system, reverse dynamics or normal dynamics of a wheel system to display motion of the manipulator apparatus by simulation display on a display (2) and control the manipulator apparatus.

Claims

1. A simulation method for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon and whose attitude can be controlled by rotation of wheels in a wheel system, comprising the steps of inputting information of an articulation angle, an articulation angular velocity and an articulation angular acceleration of said manipulator, and calculating three-dimensional dynamics of said entire manipulator apparatus including an attitude control system on a real time basis based on said information, by performing dynamics calculations without a correction term based on the laws of conservation of linear and angular momentum and time differentiation of the laws using the laws of conservation of linear and angular momentum of the entire system, reverse dynamics or normal dynamics of the wheel system;

and displaying motion of said manipulator apparatus by simulation display on a display.

2. A simulation apparatus for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon and whose attitude can be controlled by rotation of wheels in a wheel system, comprising:

a manipulator articulation information inputting section for inputting information of an articulation angle, an articulation angular velocity and an articulation angular acceleration of said manipulator;

a display for displaying motion of said manipulator apparatus by simulation display thereon;

a three-dimensional dynamics real time simulation section for receiving information from said manipulator articulation information inputting section and for calculating three-dimensional dynamics of said entire manipulator apparatus including an attitude control system on a real time basis by performing dynamics calculation without a correction term based on the laws of conservation of linear and annular momentum and time differentiation of the law using the laws of conservation of linear and angular momentum of the entire system, reverse dynamics or normal dynamics of the wheel system, said simulation section causing said display to display motion of said manipulator apparatus by simulation display.

3. A simulation apparatus for a manipulator apparatus as set forth in claim 2, wherein said three-dimensional dynamics real time simulation section (10) includes

a manipulator apparatus velocity and angular velocity calculation section (4) for inputting position attitude information and wheel angular velocity information of said manipulator apparatus (12) and manipulator articulation angle and articulation angular velocity information from said manipulator articulation information inputting section (1) and calculating velocity and angular velocity information of said manipulator apparatus (12) using the laws of conservation of linear and angular momentum of the entire system,

a manipulator apparatus position information calculation section (5) for inputting the position information of said manipulator apparatus (12) and velocity and angular velocity information obtained by said manipulator apparatus velocity and angular velocity calculation section (4) at two certain points of time, performing integration of first order for the input information to obtain position information of said manipulator apparatus (12) at a next point of time and outputting the position information to said display,

a wheel feedback control torque calculation section (6) for receiving the manipulator apparatus position information from said manipulator apparatus position information calculation section (5) and calculating a wheel feedback control torque.

an internal torque and wheel system inertial information calculation section (7) for inputting the manipulator articulation angle and articulation angular velocity information and calculating an internal torque and wheel system inertia information using the normal dynamics of the wheel system,

a wheel feed forward torque calculation section (8) for inputting the manipulator articulation angle and articulation angular velocity information and calculating a wheel feed forward torque using binding reverse dynamics, and

a wheel dynamics integration section (9) for inputting the wheel rotational angles, wheel angular velocity information, feedback control torque information, internal torque information, wheel system inertia information and feed forward torque information at two points of time and outputting wheel rotational angle and wheel angular velocity information at a next point of time.

4. A simulation apparatus for a manipulator apparatus as set forth in claim 3, wherein said wheel dynamics integration section (9) is constructed as a first order integration section such that, when it is to numerically solve an equation of motion of the entire system, it performs only numerical integration of first order for said wheels from the rotational symmetry of said wheels while it does not require rotational angle information of said wheels.

5. A simulation apparatus for a manipulator apparatus as set forth in claim 3, wherein said wheel dynamics integration section (9) is constructed as a second order integration section such that wheel angular velocity information is obtained by calculation of integration of first order and then wheel rotational angle information is obtained by calculation of integration of second order.

6. A simulation apparatus for a manipulator apparatus as set forth in claim 5, wherein when an equation of motion of the entire system is to be solved numerically, from the rotational symmetry of said wheels, the step sizes in numerical integration of first order and numerical integration of second order of said wheels are made different from each other such that the numerical integration of second order is processed by rougher calculation than the numerical integration of first order.

7. A simulation apparatus for a manipulator apparatus as set forth in claim 5, wherein when an equation of motion of the entire system is to be solved numerically, from the rotational symmetry of said wheels, the integration degree numbers in numerical integration of first order and numerical integration of second order of said wheels are made different from each other such that the numerical integration of second order is processed by rougher calculation than the numerical integration of first order.

8. A simulation apparatus for a manipulator apparatus as set forth in claim 5, wherein when an equation of motion of the entire system is to be solved numerically, from the rotational symmetry of said wheels, the step sizes and the integration degree numbers in numerical integration of first order and numerical integration of second order of said wheels are made different from each other such that the numerical integration of second order is processed by rougher calculation than the numerical integration of first order.

9. A simulation apparatus for a manipulator apparatus as set forth in claim 3, wherein in order to calculate a rotational angle of said wheels at a high speed with a high degree of accuracy, inertial moments of all of said wheels are proportionally multiplied.

10. A simulation apparatus for a manipulator apparatus as set forth in claim 3, wherein when rotation of said wheels is to be displayed on said display, an angular velocity of said wheels is displayed in the form wherein it is proportionally multiplied immediately before it is displayed.

11. A simulation and control method for a manipulator apparatus, said apparatus including:

a manipulator,

a manipulator body for supporting said manipulator thereon, and

an attitude control system by which attitude can be controlled by rotation of wheels in a wheel system,

a manipulator control system for inputting information of an articulation angle, an articulation angular velocity and an articulation angular acceleration of said manipulator and for controlling said manipulator, and

a cooperative control system having means for calculating a disturbance originating from said manipulator based on information from said manipulator control system using a required algorithm and for supplying the disturbance as a feed forward signal to said attitude control system, and

said cooperative control system having means for taking, in order to compensate for the disturbance originating from said manipulator, an angular momentum or a wheel angular velocity obtained by dividing the angular momentum by a mass of each of said wheels or a torque as a feed forward amount to be delivered to said wheel control system of said attitude control system and for calculating an aimed angular momentum or an aimed angular velocity of said wheels from the laws of conservation of linear and angular momentum or reverse dynamics for the universe to control said wheels,

comprising the steps of inputting information of an articulation angle, an articulation angular velocity and an articulation angular acceleration of said manipulator, calculating three-dimensional dynamics of said entire manipulator apparatus on a real time basis based on the information using the laws of conservation of linear and angular momentum of the entire system, reverse dynamics or normal dynamics of the wheel system, and displaying motion of said manipulator apparatus by simulation display on a display.

12. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the laws of conservation of linear and angular momentum, a constraint that the angular velocity of a manipulator body is 0 is applied to the angular velocity of said manipulator body.

13. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the laws of conservation of linear and angular momentum, a constraint that the angular velocity of a manipulator body is a constant is applied to the angular velocity of said manipulator body.

14. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the laws of conservation of linear and angular momentum, a constraint that the angular velocity of a manipulator body is an arbitrary function of the time is applied to the angular velocity of said manipulator body.

15. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the reverse dynamics for the universe, a constraint that the angular acceleration of a manipulator body is 0 is applied to the angular acceleration of said manipulator body.

16. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the reverse dynamics for the universe, a constraint that the angular velocity and the angular acceleration of a manipulator body are both 0 is applied to the angular velocity and the angular acceleration of said manipulator body.

17. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the reverse dynamics for the universe, a constraint that the angular velocity of a manipulator body is a constant and the angular acceleration of said manipulator body is 0 is applied to the angular velocity and the angular acceleration of said manipulator body.

18. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the reverse dynamics for the universe, a constraint that the angular acceleration of a manipulator body is an arbitrary function of the time is applied to the angular acceleration of said manipulator body.

19. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein upon application of the reverse dynamics for the universe, a constraint that the angular velocity and the angular acceleration of a manipulator body are both arbitrary functions of the time is applied to the angular velocity and the angular acceleration of said manipulator body.

20. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein the degree of freedom of the entire system is set to a sum L+6 of the number L of articulations of said manipulator and the degree of freedom of 6 of the position and attitude of said manipulator body.

21. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein said attitude control system performs PD feedback control based on an attitude angle of said manipulator apparatus and differentiation of the attitude angle in order to compensate for a disturbance originating from said manipulator.

22. A simulation and control method for a manipulator apparatus as set forth in claim 11, wherein said attitude control system performs PID feedback control based on an attitude angle of said manipulator apparatus, integration of the attitude angle and differentiation of the attitude angle in order to compensate for a disturbance originating from said manipulator.

23. A simulation and control apparatus for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon and whose attitude can be controlled by rotation of wheels, comprising:

a manipulator articulation information inputting section for inputting information of an articulation angle, an articulation angular velocity and an articulation angular acceleration of said manipulator,

a display for displaying motion of said manipulator apparatus by simulation display thereon, and

a three-dimensional dynamics real time simulation section for receiving information from said manipulator articulation information inputting section and calculating three-dimensional dynamics of said entire manipulator apparatus including an attitude control system on a real time basis using the laws of conservation of linear and angular momentum of the entire system, reverse dynamics or normal dynamics of the wheel system to cause said display to display motion of said manipulator apparatus by simulation display,

an attitude control system for controlling an attitude of said manipulator apparatus using said wheels,

a manipulator control system for inputting information of an articulation angle, an articulation angular velocity and an articulation angular acceleration of said manipulator and controlling said manipulator, and

a cooperative control system for calculating a disturbance originating from said manipulator based on the information from said manipulator control system using a required algorithm and supplying the disturbance as a feed forward signal to said attitude control system, and

said cooperative control system takes, in order to compensate for the disturbance originating from said manipulator, an angular momentum or a wheel angular velocity obtained by dividing the angular momentum by a mass of each of said wheels or a torque as a feed forward amount to be delivered to said wheel control system of said attitude control system and calculates an aimed angular momentum or an aimed angular velocity of said wheels from the laws of conservation of momentum or reverse dynamics for the universe to control said wheels.

24. A simulation and control apparatus for a manipulator apparatus as set forth in claim 23, wherein said three-dimensional dynamics real time simulation section includes

a manipulator apparatus velocity and angular velocity calculation section for inputting position attitude information and wheel angular velocity information of said manipulator apparatus and manipulator articulation angle and articulation angular velocity information from said manipulator articulation information inputting section and calculating velocity and angular velocity information of said manipulator apparatus using the laws of conservation of momentum of the entire system,

a manipulator apparatus position information calculation section for inputting the position information of said manipulator apparatus and velocity and angular velocity information obtained by said manipulator apparatus velocity and angular velocity calculation section at two certain points of time, performing integration of first order for the input information to obtain position information of said manipulator apparatus at a next point of time and outputting the position information to said display,

a wheel feedback control torque calculation section for receiving the manipulator apparatus position information from said manipulator apparatus position information calculation section and calculating a wheel feedback control torque,

an internal torque and wheel system inertial information calculation section for inputting the manipulator articulation angle and articulation angular velocity information and calculating an internal torque and wheel system inertia information using the normal dynamics of the wheel system,

a wheel feed forward torque calculation section for inputting the manipulator articulation angle and articulation angular velocity information and calculating a wheel feed forward torque using binding reverse dynamics for the universe, and

a wheel dynamics integration section for inputting the wheel rotational angles, wheel angular velocity information, feedback control torque information, internal torque information, wheel system inertia information and feed forward torque information at two points of time and outputting wheel rotational angle and wheel angular velocity information at a next point of time.

25. A control method for a manipulator apparatus, said apparatus including a manipulator and a manipulator body for supporting said manipulator thereon, an attitude control system for controlling an attitude of said manipulator apparatus by using rotation of wheels, a manipulator control system for controlling said manipulator, and a cooperative control system,

said method comprising the steps:

calculating in said cooperative control system a disturbance originating from said manipulator based on information from said manipulator control system using a required algorithm and supplying the disturbance as a feed forward signal to said attitude control system, and

taking by said cooperative control system, in order to compensate for the disturbance originating from said manipulator, an angular momentum or a wheel angular velocity obtained by dividing the angular momentum by a mass of each of said wheels as a feed forward amount and delivering said amount to a wheel control system of said attitude control system and calculating an aimed angular momentum or an aimed angular velocity of said wheels from the laws of conservation of linear and angular momentum to control said wheels.

26. A control method for a manipulator apparatus, said apparatus including a manipulator and a manipulator body for supporting said manipulator thereon, an attitude control system for controlling an attitude of said manipulator apparatus by using rotation of wheels, a manipulator control system for controlling said manipulator, and a cooperative control system,

said method comprising the steps:

calculating in said cooperative control system a disturbance originating from said manipulator based on information from said manipulator control system using a required algorithm and supplying the disturbance as a feed forward signal to said attitude control system, and

taking by said cooperative control system, in order to compensate for the disturbance originating from said manipulator, a torque as a feed forward amount and delivering said amount to a wheel control system of said attitude control system and calculating a value of the torque from reverse dynamics to control said wheels.

27. A control method for a manipulator apparatus, said apparatus including a manipulator and a manipulator body for supporting said manipulator thereon, an attitude control system for controlling an attitude of said manipulator apparatus by using rotation of wheels, a manipulator control system for controlling said manipulator, and a cooperative control system,

said method comprising the steps:

calculating in said cooperative control system a disturbance originating from said manipulator based on information from said manipulator control system using a required algorithm and supplying the disturbance as a feed forward signal to said attitude control system, and

taking by said cooperative control system, in order to compensate for the disturbance originating from said manipulator, one of an angular momentum, a wheel angular velocity obtained by dividing the angular momentum by a mass of each of said wheels and a torque as a feed forward amount and delivering said amount to a wheel control system of said attitude control system and calculating respectively one of an aimed angular momentum and an aimed angular velocity of said wheels from the laws of conservation of momentum and reverse dynamics to control said wheels.

28. A simulation method for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon, comprising the steps of

inputting route instruction value information of said manipulator as an initial instruction value and forecasting information of a disturbance which is produced when said manipulator operates in accordance with the initial instruction value on a real time basis as an excessive instruction value control index based on a dynamic model regarding said manipulator, and

performing scale conversion for the initial instruction value based on the excessive instruction value control index to obtain an intermediate instruction value, and thereafter

displaying motion of said manipulator by simulation display in accordance with the intermediate instruction value obtained by the scale conversion.

29. A simulation method for a manipulator apparatus as set forth in claim 28, wherein linear and angular momentum are forecast on a real time basis as the excessive instruction value control index using the laws of conservation of momentum.

30. A simulation method for a manipulator apparatus as set forth in claim 28, wherein torque/force are forecast on the real time basis as the excessive instruction value control index using reverse dynamics.

31. A simulation method for a manipulator apparatus as set forth in claim 28, wherein angular momentum and a torque/force are forecast on the real time basis as the excessive instruction value control indices using the laws of conservation of momentum and reverse dynamics.

32. A simulation method for a manipulator apparatus as set forth in claim 28, characterized in that, as differentiation information of the initial instruction value which is to be used upon calculation of the excessive instruction value control index, a differential value of the initial instruction value is used after it is processed by averaging processing.

33. A simulation method for a manipulator apparatus as set forth in claim 28, characterized in that exponential conversion calculation is performed when the scale conversion is to be performed.

34. A simulation method for a manipulator apparatus as set forth in claim 28, characterized in that the scale conversion processing and spline interpolation calculation processing are combined with each other to produce an aimed route for said manipulator.

35. A simulation method for a manipulator apparatus as set forth in claim 34, characterized in that spline interpolation calculation processing continuous to differentiation of first order is used as the spline interpolation calculation processing.

36. A simulation method for a manipulator apparatus as set forth in claim 34, characterized in that spline interpolation calculation processing continuous to differentiation of second order is used as the spline interpolation calculation processing.

37. A simulation apparatus for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon, comprising:

initial instruction value inputting means for inputting route instruction value information of said manipulator as an initial instruction value,

excessive instruction value control index forecasting means for receiving the initial instruction value from said initial instruction value inputting means and forecasting information of a disturbance, which is produced when said manipulator operates in accordance with the initial instruction value, on a real time basis as an excessive instruction value control index based on a dynamic model regarding said manipulator,

scale conversion means for performing scale conversion for the initial instruction value based on the excessive instruction value control index forecast by said excessive instruction value control index forecasting means to obtain an intermediate instruction value, and

display means for displaying motion of said manipulator by simulation display in accordance with the intermediate instruction value obtained by the conversion of said scale conversion means.

38. A simulation and control method for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon, wherein

route instruction value information of said manipulator is inputted as an initial instruction value and information of a disturbance, which is produced when said manipulator operates in accordance with the initial instruction value, is forecast on a real time basis as an excessive instruction value control index based on a dynamic model regarding said manipulator, and

scale conversion is performed for the initial instruction value based on the excessive instruction value control index to obtain an intermediate instruction value, and then

motion of said manipulator is displayed by simulation display and said manipulator is controlled in accordance with the intermediate instruction value obtained by the scale conversion.

39. A simulation and control method for a manipulator apparatus as set forth in claim 38, characterized in that, in order to control said manipulator, controlling processing is performed for a first intermediate instruction value obtained by the scale conversion of the initial instruction value based on an actual disturbance of the manipulator system to obtain a second intermediate instruction value, and then said manipulator is controlled in accordance with the second stage intermediate instruction value.

40. A simulation and control method for a manipulator apparatus as set forth in claim 38, wherein characterized in that, in addition to motion of said manipulator based on the intermediate instruction value, motion of said manipulator based on the initial instruction value and a reached value representative of a current position of said manipulator is displayed by simulation display.

41. A simulation and control method for a manipulator apparatus as set forth in claim 40, characterized in that, if a difference greater than a predetermined value is produced among the initial instruction value, the intermediate instruction value and the reached value, the initial instruction value and the intermediate instruction values later than the current reached point of said manipulator are reset and the initial instruction value of said manipulator is re-set to the current reached point.

42. A simulation and control apparatus for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon, comprising:

initial instruction value inputting means for inputting route instruction value information of said manipulator as an initial instruction value,

excessive instruction value control index forecasting means for receiving the initial instruction value from said initial instruction value inputting means and forecasting information of a disturbance, which is produced when said manipulator operates in accordance with the initial instruction value, on a real time basis as an excessive instruction value control index based on a dynamic model regarding said manipulator,

scale conversion means for performing scale conversion for the route instruction value information based on the excessive instruction value control index forecast by said excessive instruction value control index forecasting means to obtain an intermediate instruction value,

display means for displaying motion of said manipulator by simulation display in accordance with the intermediate instruction value obtained by the conversion of said scale conversion means, and control means for controlling said manipulator in accordance with the intermediate instruction value obtained by the conversion of said scale conversion means.

43. A control method for a manipulator apparatus which includes a manipulator and a manipulator body for supporting said manipulator thereon, characterized in that

route instruction value information of said manipulator is inputted as an initial instruction value and information of a disturbance, which is produced when said manipulator operates in accordance with the initial instruction value, is forecast on the real time basis as an excessive instruction value control index based on a dynamic model regarding said manipulator, and

scale conversion is performed for the initial instruction value based on the excessive instruction value control index to obtain an intermediate instruction value, and then

said manipulator is controlled in accordance with the intermediate instruction value obtained by the scale conversion.

44. A control apparatus for a manipulator apparatus (12) which includes a manipulator and a manipulator body for supporting said manipulator thereon, characterized in that it comprises

initial instruction value inputting means for inputting route instruction value information of said manipulator as an initial instruction value,

excessive instruction value control index forecasting means for receiving the initial instruction value from said initial instruction value inputting means and forecasting information of a disturbance, which is produced when said manipulator operates in accordance with the initial instruction value, on the real time basis as an excessive instruction value control index based on a dynamic model regarding said manipulator,

scale conversion means for performing scale conversion for the route instruction value information based on the excessive instruction value control index forecast by said excessive instruction value control index forecasting means to obtain an intermediate instruction value, and

control means for controlling said manipulator in accordance with the intermediate instruction value obtained by the conversion of said scale conversion means.