CN106475999A - The acceleration control method of the Dual-Arm Coordination based on impedance model under hard conditions - Google Patents
The acceleration control method of the Dual-Arm Coordination based on impedance model under hard conditions Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/0081—Programme-controlled manipulators with master teach-in means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J13/00—Controls for manipulators
- B25J13/08—Controls for manipulators by means of sensing devices, e.g. viewing or touching devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/16—Programme controls
- B25J9/1602—Programme controls characterised by the control system, structure, architecture
- B25J9/1607—Calculation of inertia, jacobian matrixes and inverses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/16—Programme controls
- B25J9/1628—Programme controls characterised by the control loop
- B25J9/1633—Programme controls characterised by the control loop compliant, force, torque control, e.g. combined with position control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/16—Programme controls
- B25J9/1679—Programme controls characterised by the tasks executed
- B25J9/1682—Dual arm manipulator; Coordination of several manipulators
Abstract
The invention discloses under a kind of hard conditions the Dual-Arm Coordination based on impedance model acceleration control method, comprise the following steps:S1:Robot controller gathers the information of six-dimension force sensor, the information collecting is filtered processing first, then carries out gravity compensation, finally obtains the departure data with expected force or expectation moment values;S2:According to impedance model the departure transformation of data of the departure data of power or moment values is the robot end's acceleration of movement and angular acceleration of pivoting in cartesian space;S3:Try to achieve corresponding position function, velocity function, acceleration function and acceleration function;S4:According to inverse kinematics and then try to achieve the joint angles function in joint space;S5:Sent to servo-driver by the bus of controller after isochronous interpolation joint angles function being carried out joint space, and then control the action of robot.The present invention can realize real-time force tracking effect, and motion smoothing when robot follows.
Description
Technical field
The present invention relates to the high accuracy based on impedance model is drawn under industrial robot field, more particularly to hard conditions
The method for control speed of teaching robot.
Background technology
For multi-robot cooperation system is compared to single robot, in work compound ability, adapt to complex task and adaptation
The aspects such as complex environment embody advantage, and are also the very important link of one of co-melting robot, are intelligent groups
The basis realized.Taking multi-robot Cooperation welding as a example, in multi-robot Cooperation welding, the key scientific problems of more core are:
Position power coordination problem between both arms (two transfer robots), current difficult point is embodied in the difficult control of internal force between both arms, existing
It is big etc. that control algolithm realizes difficulty.Between traditional solution both arms, three kinds of intuitive solution of position power coordination are:1) foundation is double
Kinetic model under robot closed chain:Set up the Coupling Dynamic Model of both arms and the object to be operated, and attempt theoretically
Solve the problems such as system modelling error and external interference;2) hybrid position/power controls:Contact force to robot end and position
Carry out orthogonal control, carry out power control in a direction, other directions carry out position control.3) set up mechanical arm and operated thing
Internal impedance between body, solves the problems, such as the internal force in the machine human world;Set up by the external impedance between operation object and environment, solve thing
Body and the external force problem of environment;Internal impedance and external impedance fused controlling.However, these three schemes suffer from the drawback that:1. it is directed to
Scheme 1 and scheme 3, most of research at present rests on the theory analysis stage, and experiment also stays at simply both arms cooperation clamping
Workpiece is simply moved.2. it is directed to scheme 2, hybrid position/power control is only applicable to the tight coordination of non-critical certain direction lower
By the situation of force constraint, such as cooperate and the task such as carry, capture and assemble, be not appropriate for 6 DOF degree under strictly tight coordination and be all subject to
The industrial applications of force constraint, such as multi-robot Cooperation welding workpiece.3. it is directed to scheme 3, do not solve strict in actual control
The poor problem with the difficult control of internal force of both arms real-time under tight coordination.
Content of the invention
Goal of the invention:It is an object of the invention to provide a kind of hard conditions that can solve the problem that defect present in prior art
Under Dual-Arm Coordination based on impedance model acceleration control method.
Technical scheme:For reaching this purpose, the present invention employs the following technical solutions:
The acceleration control method of the Dual-Arm Coordination based on impedance model under hard conditions of the present invention, including following
Step:
S1:Robot controller gathers the information of six-dimension force sensor, the information collecting is filtered processing first,
Then carry out gravity compensation, finally obtain the departure data with expected force or expectation moment values;
S2:According to impedance model by the departure transformation of data of the departure data of power or moment values be robot end
The acceleration of movement and the angular acceleration pivoting in cartesian space;
S3:Smooth interpolation is carried out according to the S type speed control curve of deformation to motion, tries to achieve corresponding position function, speed
Degree function, acceleration function and acceleration function;
S4:According to inverse kinematics and then try to achieve the joint angles function in joint space;
S5:Sent to watching by the bus of controller after joint angles function being carried out the isochronous interpolation of joint space
Take driver, and then control the action of robot.
Further, in described step S1, the information that robot controller gathers six-dimension force sensor is in specified force control week
Phase reads power and the moment information of six-dimension force sensor by UDP communication port.
Further, in described step S2, robot end's acceleration of movement and pivoting in cartesian space
The matrix a of angular acceleration compositioniRepresent, aiMatrix for 6*1, matrix aiMiddle first three rows are that robot end is empty in Descartes
Between middle movement acceleration, three row are the angular acceleration that robot end pivots in cartesian space afterwards, aiFor:
In formula (1), FzmaxMaximum six-dimensional force and moment information that expression can be born, amaxRepresent that robot end allows
Peak acceleration, FdRepresent expectation follow the tracks of six-dimensional force, f be a monotonic function, S represent diagonal line function be 0 or 1 right
Angular moment battle array.
Further, described step S3 comprises the following steps:
S3.1:Position function θ (t), velocity function v (t), acceleration function a (t) and acceleration are tried to achieve according to formula (2)
Function j (t):
In formula (2), θiFor initial position, viFor initial velocity, aiFor initial acceleration, ai+1For desired terminal velocity, t
For the normalized time, T is the communication cycle of robot controller and servo-driver;
S3.2:Judge ai+1With aiDifference absolute value whether more than amax, viAbsolute value whether more than Vmax, amaxRepresent
The acceleration of the robot end's maximum allowing, VmaxRepresent the maximum speed of the robot end allowing:If ai+1With aiIt
The absolute value of difference is more than amax, viAbsolute value be not above Vmax, then carry out step S3.3;If ai+1With aiDifference absolute value
More than amax, viAbsolute value also above Vmax, then carry out step S3.4;
S3.3:Judge ai+1With aiSize:If ai> ai+1, then position function θ (t), speed are recalculated according to formula (3)
Degree function v (t), acceleration function a (t) and acceleration function j (t);If ai< ai+1, then position is recalculated according to formula (4)
Put function # (t), velocity function v (t), acceleration function a (t) and acceleration function j (t);
S3.4:Position function θ (t), velocity function v (t), acceleration function a (t) are recalculated according to formula (5) and plus adds
Velocity function j (t);
Further, in described step S5, the bus of controller is EtherCAT bus.
Further, described robot controller is divided into six levels from top to bottom, that is, client layer, six-dimensional force signals collecting and
Process layer, impedance control layer, Acceleration Control layer, joint interpolation layer and EtherCAT bus communication layer;Wherein, client layer, six
Dimension force signal collection and process layer, the opening of impedance control layer, Acceleration Control layer, joint interpolation layer and EtherCAT bus
Communication Layer is not externally developed.
Further, described client layer provides the user mutual interface of user's secondary development, six-dimensional force Signal sampling and processing
Layer provides six-dimensional force collection and the Processing Interface of user's secondary development, and impedance control layer provides the impedance control of user's secondary development
Interface.
Beneficial effect:Compared with prior art, the present invention has following beneficial effect:
1) solve the problems, such as actual industrial:Dissect the problem that present actual industrial scene exists, analyze its essential characteristic, propose
Corresponding solution, not only rests on theory analysis stage and the carrying application of simple both arms;
2) method versatility:Compared to traditional hybrid position power coordination approach be only applicable to non-critical tightly coordinate (only certain
Individual direction or certain several direction are constrained by power) task, the scheme being carried have more versatility, tightly coordinate for non-critical simultaneously
Task and strictly tight two kinds of situations of coordination of tasks (six dimensions are all by force constraint) provide solution;
3) improve following effect in real time and solving the uncontrollable problem of internal force of coordination.Compared to traditional power prosecutor case
Speech, the present invention can realize real-time force tracking effect, and motion smoothing when robot follows, and efficiently solves between both arms
Internal force hardly possible control problem;
4) provide open second development interface.Include for the open interface of user:The user mutual interface of task layer,
The model interface of impedance layer, user oneself can change flexible parameter and modification impedance model according to demand.
Brief description
Fig. 1 is the schematic diagram of Dual-Arm Coordination control system that is directed to of method of the specific embodiment of the invention;
Fig. 2 is the Acceleration Control Organization Chart of the specific embodiment of the invention;
Fig. 3 is the flow chart in the unit force control cycle of Dual-Arm Coordination under the hard conditions of the specific embodiment of the invention;
Fig. 4 is the block diagram of the impedance control of the specific embodiment of the invention;
Fig. 5 is the corresponding relation figure of the F based on impedance model and a of the specific embodiment of the invention;
Fig. 6 is the speed controlling schematic diagram based on deformation S type curve of the specific embodiment of the invention;
Fig. 7 is the position based on speed control curve, speed, acceleration and the acceleration of the specific embodiment of the invention
Schematic diagram.
Specific embodiment
With reference to specific embodiment, technical scheme is further introduced.
This specific embodiment discloses a kind of Acceleration Control of the Dual-Arm Coordination under hard conditions based on impedance model
Method, comprises the following steps:
S1:Robot controller gathers the information of six-dimension force sensor, the information collecting is filtered processing first,
Then carry out gravity compensation, finally obtain the departure data with expected force or expectation moment values;
S2:According to impedance model by the departure transformation of data of the departure data of power or moment values be robot end
The acceleration of movement and the angular acceleration pivoting in cartesian space;
S3:Smooth interpolation is carried out according to the S type speed control curve of deformation to motion, tries to achieve corresponding position function, speed
Degree function, acceleration function and acceleration function;
S4:According to inverse kinematics and then try to achieve the joint angles function in joint space;
S5:Sent to watching by the bus of controller after joint angles function being carried out the isochronous interpolation of joint space
Take driver, and then control the action of robot.
Fig. 1 is the structural representation of Dual-Arm Coordination control system.Defining wherein one robot is leading robot, clamping
A part for the object to be operated, and the track of leading motion;An other robot is auxiliary robot, clamps the object to be operated
Another part, in auxiliary robot end, six-dimension force sensor is installed, for preventing from leading to internal force excessive due to position and attitude error
Damage force transducer, protection device is installed between robot end and six-dimension force sensor, auxiliary robot is according to end
The feedback information of six-dimension force sensor follows the tracks of the movement locus of leading robot.
Robot controller is divided into six levels from top to bottom, as shown in Fig. 2 i.e. client layer, six-dimensional force signals collecting and
Process layer, impedance control layer, Acceleration Control layer, joint interpolation layer and EtherCAT bus communication layer;Wherein, 1) client layer master
It is used for interacting with user interface, for example, interacts with teaching box, the effect of this layer is to set correlation according to user's request
Parameter, flexible parameter that such as auxiliary robot need to show in universal time coordinated etc..2) six-dimensional force Signal sampling and processing layer is mainly used
In the collection of sextuple force signal, filtering, gravity compensation etc..3) impedance control layer mainly sets up six-dimensional force deviation and auxiliary machinery
The relation of people's end movement, establishes power deviation F in the present invention and move in cartesian space and add in auxiliary robot end
The transformation relation of speed a, the schematic diagram of specific relational expression is as shown in figure 4, the model adopting is impedance Control Model.4) accelerate
Degree key-course is mainly the smooth control realized in cartesian space based on accelerating curve according to the relationship model that Fig. 4 is set up
System, is that auxiliary robot draws lower end final behavior table based on impedance model in cartesian space in leading robot
Existing:Real-time tracking dominates the movement locus of robot.5) when interpolation layer in joint mainly carries out to each axle waiting in joint space
Interpolation synchronous planning.6) EtherCAT bus communication layer mainly completes the conversion to pulsed quantity for the joint angle angle value, and passes through
This pulses switch amount is sent to servo slave station by EtherCAT main website, receives the status information from servo slave station simultaneously, including
State value, present position values, velocity amplitude, accekeration etc..
In robot controller, most crucial layer is:Force signal collection and process layer, impedance layer and Acceleration Control layer, this
Three layers are commonly referred to as Dual-Arm Coordination power control bag.1) force signal collection and result have impact on the precision of traction, and force signal is typically logical
The method crossing filtering removes dither signal, then carries out gravity compensation under various poses to auxiliary robot.2) impedance layer
Core is impedance model, linear function transformation or quadratic polynomial functional transformation that user can oneself set according to demand, but
It is the requirement that need to meet monotonic function.3) Acceleration Control layer is the S type deformation acceleration planning of quintic algebra curve, specified
Acceleration was carried out in the unit force control cycle with smooth interpolation, makes auxiliary robot end movement smooth and ensure to follow in real time leading
Robot.
In fig. 2, " open " in open architecture controller is embodied in:Provide the user with the interface of secondary development, including
The interface of three openings:User mutual interface (User Interface, UI), six-dimensional force collection and Processing Interface (Force/
Torque Acquire Interface, FTAI) and impedance control interface (Impedance Control Interface,
ICI), other layers (speed controlling layer, joint interpolation layer and Communication Layer) are related to specific control realization, therefore not to external-open
Put.
Fig. 3 is the unit force control cyclic flow graph of Dual-Arm Coordination under hard conditions.User (for example can show according to user interface
Religion box) start auxiliary robot coordination tracing mode, and related robot flexibility tracking parameter is set, such as robot expectation
The inertia (M) that shows, damping (B) and rigidity (K) coefficient etc..Robot controller in real time to six-dimensional force information,
Filtering and process, obtain current six-dimensional force departure after the gravity compensation then entering line sensor, and then according to based on modulus of impedance
The Acceleration Control algorithm of type tries to achieve pose departure, and final control auxiliary robot follows the tracks of leading machine according to pose side-play amount
The track of people.
Fig. 4 is the structure chart of impedance control, is an introduction about the construction to Fig. 3 flow chart.
In step S2, on the basis of step S1, according to user set robot flexibility parameter and selectable impedance
Types of models initializes the parameter of impedance layer, and flexible parameter can set inertia, damping and the rigidity of robot expectation performance, with
When can be according to the impedance model type set such as functional relationship in Figure of description 5, generally, according to the flexibility of user
Parameter can automatically select corresponding functional relationship (a certain functional relationship in Fig. 5), and general function expression is as follows:
In formula (1), aiFor robot end in cartesian space the acceleration of movement and the angular acceleration that pivots
The matrix of composition, aiMatrix for 6*1, matrix aiMiddle first three rows are the acceleration of robot end's movement in cartesian space,
Three row are the angular acceleration that robot end pivots in cartesian space afterwards;FzmaxIt is maximum sextuple that expression can be born
Power and moment information, FzmaxIt is a matrix being made up of three-dimensional force and three-dimensional moment, amaxRepresent that robot end allows
High acceleration, FdRepresent the six-dimensional force that expectation is followed the tracks of, f represents the function shown in Fig. 5, and S represents that diagonal line function is 0 or 1
Diagonal matrix.
Herein choose curve 3. as a example, i.e. linear functional relation, then corresponding function expression is as follows:
S in above formula is the matrix of sextuple degree, and S is pair of horns matrix it is intended that diagonal entry is only 0 or 1.Unit
Element is set to 0 expression position offset in this direction and does not stress the impact of deviation signal, and that is, the direction does not stress constraint;Element
It is set to the 1 expression direction and is subject to force constraint, set herein according to actual demand.
Step S3 comprises the following steps:
S3.1:On the basis of step S2, define the power control cycle first, the principle of definition is:Controller and driving at present
Communication cycle between device is 1ms or 4ms, and on the basis of 1ms or 4ms, controlling cycle defines suitable timeslice to realize
The control in one power control cycle, definition unit interval piece is 20 controlling cycles, and that is, 20ms or 80ms is a timeslice,
Controller bottom ensure that the power control cycle is short enough.
Known initial position θi, initial velocity vi, initial acceleration ai, initial jerk ji=0, desired terminal speed
Degree vi+1, desired terminal acceleration ai+1With desired terminal acceleration ji+1=0, set up following quintic algebra curve equation:
Wherein, w0,w1,w2,w3,w4,w5For the coefficient of quintic algebra curve, according to " acceleration of a certain moment Mo and next
Acceleration at the beginning of moment is continuous " constraints obtain to the constraint equation that should look like this.
The coefficient of quintic algebra curve can be calculated according to above-mentioned constraints, corresponding Acceleration Control curve is as said
Shown in bright accompanying drawing 6.And then derive the function of corresponding position, acceleration and acceleration, expression is as follows:
In formula (5), θiFor initial position, viFor initial velocity, aiFor initial acceleration, ai+1For desired terminal velocity, t
For the normalized time, T is the communication cycle of robot controller and servo-driver;Position function θ is tried to achieve according to formula (5)
(t), velocity function v (t), acceleration function a (t) and acceleration function j (t);
S3.2:Judge ai+1With aiDifference absolute value whether more than amax, viAbsolute value whether more than Vmax, amaxRepresent
The acceleration of the robot end's maximum allowing, VmaxRepresent the maximum speed of the robot end allowing:If ai+1With aiIt
The absolute value of difference is more than amax, viAbsolute value be not above Vmax, then carry out step S3.3;If ai+1With aiDifference absolute value
More than amax, viAbsolute value also above Vmax, then carry out step S3.4;
S3.3:Judge ai+1With aiSize:If ai> ai+1, then position function θ (t), speed are recalculated according to formula (6)
Degree function v (t), acceleration function a (t) and acceleration function j (t);If ai< ai+1, then position is recalculated according to formula (7)
Put function # (t), velocity function v (t), acceleration function a (t) and acceleration function j (t);
S3.4:Position function θ (t), velocity function v (t), acceleration function a (t) are recalculated according to formula (8) and plus adds
Velocity function j (t);
This specific embodiment is 16Kg with the artificial experimental subject of two ESTUN ER16 industrial machines, its load, and one
, as leading robot, one as auxiliary robot for platform.Now only consider the situation of auxiliary robot it is assumed that initial position θi=
0th, initial velocity vi=0, initial acceleration ai=0, initial jerk ji=0, desired terminal acceleration ai+1=500mm/
s2With desired terminal acceleration (ji+1=0), corresponding position, speed, acceleration and acceleration are in unit interval piece
Curve chart as shown in Figure 7.
Above-mentioned accompanying drawing to specifications 1 is built dual arm system, the level in by specification accompanying drawing 2 is by above-mentioned algorithm in control
It is achieved in device processed, you can robot draws the effect of robot.
Claims (7)
1. under hard conditions the Dual-Arm Coordination based on impedance model acceleration control method it is characterised in that:Walk including following
Suddenly:
S1:Robot controller gathers the information of six-dimension force sensor, the information collecting is filtered processing, then first
Carry out gravity compensation, finally obtain the departure data with expected force or expectation moment values;
S2:According to impedance model by the departure transformation of data of the departure data of power or moment values be robot end in flute
The acceleration of movement and the angular acceleration pivoting in karr space;
S3:Smooth interpolation is carried out according to the S type speed control curve of deformation to motion, tries to achieve corresponding position function, speed letter
Number, acceleration function and acceleration function;
S4:According to inverse kinematics and then try to achieve the joint angles function in joint space;
S5:Sent by the bus of controller after joint angles function being carried out the isochronous interpolation of joint space and drive to servo
Dynamic device, and then control the action of robot.
2. under hard conditions according to claim 1 the Dual-Arm Coordination based on impedance model acceleration control method, its
It is characterised by:In described step S1, the information that robot controller gathers six-dimension force sensor is to pass through in the specified force control cycle
UDP communication port reads power and the moment information of six-dimension force sensor.
3. under hard conditions according to claim 1 the Dual-Arm Coordination based on impedance model acceleration control method, its
It is characterised by:In described step S2, the robot end acceleration of movement and the angle pivoting in cartesian space accelerate
The matrix a of degree compositioniRepresent, aiMatrix for 6*1, matrix aiMiddle first three rows are that robot end moves in cartesian space
Dynamic acceleration, three row are the angular acceleration that robot end pivots in cartesian space afterwards, aiFor:
In formula (1), Fz maxMaximum six-dimensional force and moment information that expression can be born, amaxRepresent that robot end allows
High acceleration, FdRepresent the six-dimensional force that expectation is followed the tracks of, f is a monotonic function, S represents that diagonal line function is 0 or 1 to angular moment
Battle array.
4. under hard conditions according to claim 1 the Dual-Arm Coordination based on impedance model acceleration control method, its
It is characterised by:Described step S3 comprises the following steps:
S3.1:Position function θ (t), velocity function v (t), acceleration function a (t) and acceleration function j are tried to achieve according to formula (2)
(t):
In formula (2), θiFor initial position, viFor initial velocity, aiFor initial acceleration, ai+1For desired terminal velocity, t is to return
The time of one change, T is the communication cycle of robot controller and servo-driver;
S3.2:Judge ai+1With aiDifference absolute value whether more than amax, viAbsolute value whether more than Vmax, amaxRepresent and allow
The maximum acceleration of robot end, VmaxRepresent the maximum speed of the robot end allowing:If ai+1With aiDifference
Absolute value is more than amax, viAbsolute value be not above Vmax, then carry out step S3.3;If ai+1With aiThe absolute value of difference exceed
amax, viAbsolute value also above Vmax, then carry out step S3.4;
S3.3:Judge ai+1With aiSize:If ai> ai+1, then position function θ (t), speed letter are recalculated according to formula (3)
Number v (t), acceleration function a (t) and acceleration function j (t);If ai< ai+1, then position letter is recalculated according to formula (4)
Number θ (t), velocity function v (t), acceleration function a (t) and acceleration function j (t);
S3.4:Position function θ (t), velocity function v (t), acceleration function a (t) and acceleration are recalculated according to formula (5)
Function j (t);
5. under hard conditions according to claim 1 the Dual-Arm Coordination based on impedance model acceleration control method, its
It is characterised by:In described step S5, the bus of controller is EtherCAT bus.
6. under hard conditions according to claim 1 the Dual-Arm Coordination based on impedance model acceleration control method, its
It is characterised by:Described robot controller is divided into six levels from top to bottom, i.e. client layer, six-dimensional force Signal sampling and processing
Layer, impedance control layer, Acceleration Control layer, joint interpolation layer and EtherCAT bus communication layer;Wherein, client layer, six-dimensional force
Signal sampling and processing layer, the opening of impedance control layer, Acceleration Control layer, joint interpolation layer and EtherCAT bus communication
Layer is not externally developed.
7. under hard conditions according to claim 6 the Dual-Arm Coordination based on impedance model acceleration control method, its
It is characterised by:Described client layer provides the user mutual interface of user's secondary development, and six-dimensional force Signal sampling and processing layer provides
The six-dimensional force collection of user's secondary development and Processing Interface, impedance control layer provides the impedance control interface of user's secondary development.
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