% 6DOF Kuka KR5 Arc Robot D_H Notation and Robot COnfiguration
close all;
clear all;
l=Link([0,.4,.18,(pi)/2,0])
l(2)=Link([0,.135,.6,(pi),0])
l(3)=Link([0,.135,.12,-(pi)/2,0])
l(4)=Link([0,.62,0,(pi)/2,0])
l(5)=Link([0,0,0,-(pi)/2,0])
l(6)=Link([0,0.115,0,0,0])
R=SerialLink(l)
%for circle
A = rand(2);
m = 200;
angles = linspace(0,2*pi,m);
f = @(theta) [cos(theta),sin(theta)];
r = arrayfun(@(i)f(angles(i)),1:m,'UniformOutput',false);
pt = reshape(cell2mat(r),[2 m]);
x= pt(1,:)
y= pt(2,:)
line(pt(1,:),pt(2,:));
hold on
plot(pt(1,:),pt(2,:),'ro')
% Initial joint angles
th = [0 0 0 0 (30*pi)/180 0].'
%Robot Pose [x y z a b c]
%p1 = [3.1416 0.5236 0 .8425 0 -.3196].'
p = [ .8425 0 -.3196 3.1416 0.5236 0].'
dth= [0 0 0 0 0 0].'
% to populate joint angles at each interval of ee path by
for i=1:200
j=R.jacob0(p, 'rpy')
ji=inv(j)
%dp1=[0 0 0 .0025 yy(i+1)-yy(i) 0].'
dp=[x(i+1)-x(i) y(i+1)-y(i) 0 0 0 0].'
y(i+1)
y(i)
dth=ji*dp
th=th+dth
p=p+dp
th1=th.'
th1 = th1*180/pi
mycell=sprintf('A%s', num2str(i+1))
xlswrite('Circle1.xlsx',th1,1,mycell)
endwith regards,
Somasundar
j=R.jacob0(p, 'rpy')
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Sir,th is the vector of intial jint angles - [ theta1, theta2 upto theta6]p is the End Effector pose [ position orientation] = [x y z roll pitch yaw]I could resolve this problem by help from the forum.I replaced p with th in the following line and got the resultj=R.jacob0(p, 'rpy')
however, How can I do this with Inverse kinematics because there are multiple vectors of joint angles for a single end effector pose that results from Inverse kinematics.how to choose the right one at each intermediate point of the circular trace of End Effector?
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Dear Sir,In place of ikine, I used ikcon and some errors were prevented. However, When I try to plot a Rectangle in Matlab using ikcon in XY Plane (rectangle in 2-D), It is plotting some rhombus like figure that too in 3-D. I verified my code and it seems alright. Not able to figure out where the problem might be. I am using toolbox 9.8CODE:% D-H parameters using%startup_rvc%L = Link ( [Th d a alph] 'Link' );L(1) = Link ( [ 0 .4 .18 pi/2] );L(2) = Link ( [ 0 .135 .6 pi ] );L(3) = Link ( [ 0 .135 .12 -pi/2 ] );L(4) = Link ( [ 0 .62 0 pi/2] );L(5) = Link ( [ 0 0 0 -pi/2 ] );L(6) = Link ( [ 0 .115 0 0 ] );Rob = SerialLink (L);A= cat(3, [1 0 0 1.2; 0 -1 0 0.5; 0 0 -1 .2; 0 0 0 1], [ 1 0 0 2.7; 0 -1 0 0.5; 0 0 -1 .2; 0 0 0 1],[ 1 0 0 2.7; 0 -1 0 1.3; 0 0 -1 .2; 0 0 0 1], [ 1 0 0 1.2; 0 -1 0 1.3; 0 0 -1 .2; 0 0 0 1], [ 1 0 0 1.2; 0 -1 0 0.5; 0 0 -1 .2; 0 0 0 1]);%);%t=0:.04:2;q1=Rob.ikcon(A);Rob.plot(q1,'trail','r');Please find output screen shotsbest regards,Somasundar A
On SaYour second pose is not reachable.
Erik
Op vrijdag 10 augustus 2018 03:51:44 UTC+2 schreef Peter Corke:This posting might be relevant to your problemhttps://groups.google.com/forum/#!msg/robotics-tool-box/VMIbW6psMPQ/5ZRvLoGtBAAJ;context-place=topic/robotics-tool-box/7bNUFrP_-8A
On Wednesday, 8 August 2018 00:23:08 UTC-4, Somasundar Avantsa wrote:Sir,I followed as per your earlier disucssion in this thread and wrote IK code. But it does not seem to go to the next nearest joint configuration in IK algorithm and the out put path is different than that expected. Kindly help me to resolve this problem.with regards,Somasundar A
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Dear Sir,What I found for alternative IK Solutions for Initial Pose are attached. Out of the 8 alternatives 5 and 6 are simple. I guess the the EE Circular pathhas no singular points when I start my Joint trajectory from 5th or 6th Solutions.Kindly guide me to select this trajectory for tracing the pathbest regards,Somasundar AV
On Mon, Sep 3, 2018 at 3:30 PM Somasundar Avantsa <> wrote:
Dear Sir,When I trace a Circular Arc End Effector path, by using ikcon,I am getting the issue detailed in post at URL which you have shared earlier. However the End Effector's Trace of Poses is perfect.But the Joint trajectories are complex.https://groups.google.com/forum/#!msg/robotics-tool-box/VMIbW6psMPQ/5ZRvLoGtBAAJ;context-place=topic/robotics-tool-box/7bNUFrP_-8AI am attaching image of the Robot Joint trajectory. Is it possible to get EE path traced by a Series of Simple Joint trajectories?Kindly help me to use appropriate method.best regards,Somasundar AV
On Tue, Aug 28, 2018 at 10:46 AM Somasundar Avantsa <> wrote:
Thank you Sirregards,Somasundar AV
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To find all trajectories will be hard as there are infinitely many trajectories.
You have to see ikcon ikine more as a joint position solution to a requested pose that a algorithm to generate joint trajectories.
Erik.
To
Prof. Peter Corke,
Australia
Respected Sir,
Greetings of the day!!!
Robotic Toolbox has been of immense help to me and your valuable replies to my queries have guided in fact me to execute some basic and 3D complex paths by following Inverse Kinematics and Inverse Jacobian approaches and estimating/ avoiding singularities.
Sir, however since the Industrial or now-a-days service robots basically use Cartesian programming to achieve offline/online path planning, I would like learn practical aspects of Robotic path planning.
Would you please suggest me to go through any research articles/websites/conferences or softwares to actually relate theoretical approaches like IK/IJ approaches of path planning with Cartesian control/programming used on floor robots or actual use of Jacobian Matrix and other concepts in Cartesian motion planning.
Thanking you,sir,
Best regards,
AV Somasundar
Research Scholor
KLEF
Vijayawada
India
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