Add function to display the Stewart configuration
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figs/stewart_architecture_example.pdf
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figs/stewart_architecture_example.pdf
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figs/stewart_architecture_example.png
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figs/stewart_architecture_example_pose.pdf
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figs/stewart_architecture_example_pose.pdf
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figs/stewart_architecture_example_pose.png
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src/displayArchitecture.m
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src/displayArchitecture.m
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@ -0,0 +1,171 @@
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function [] = displayArchitecture(stewart, args)
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% displayArchitecture - 3D plot of the Stewart platform architecture
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%
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% Syntax: [] = displayArchitecture(args)
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%
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% Inputs:
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% - stewart
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% - args - Structure with the following fields:
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% - AP [3x1] - The wanted position of {B} with respect to {A}
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% - ARB [3x3] - The rotation matrix that gives the wanted orientation of {B} with respect to {A}
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% - ARB [3x3] - The rotation matrix that gives the wanted orientation of {B} with respect to {A}
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% - frames [true/false] - Display the Frames
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% - legs [true/false] - Display the Legs
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% - joints [true/false] - Display the Joints
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% - labels [true/false] - Display the Labels
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% - platforms [true/false] - Display the Platforms
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%
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% Outputs:
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arguments
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stewart
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args.AP (3,1) double {mustBeNumeric} = zeros(3,1)
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args.ARB (3,3) double {mustBeNumeric} = eye(3)
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args.frames logical {mustBeNumericOrLogical} = true
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args.legs logical {mustBeNumericOrLogical} = true
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args.joints logical {mustBeNumericOrLogical} = true
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args.labels logical {mustBeNumericOrLogical} = true
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args.platforms logical {mustBeNumericOrLogical} = true
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end
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figure;
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hold on;
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FTa = [eye(3), stewart.FO_A; ...
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zeros(1,3), 1];
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ATb = [args.ARB, args.AP; ...
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zeros(1,3), 1];
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BTm = [eye(3), -stewart.MO_B; ...
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zeros(1,3), 1];
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FTm = FTa*ATb*BTm;
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d_unit_vector = stewart.H/4;
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d_label = stewart.H/20;
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Ff = [0, 0, 0];
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if args.frames
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quiver3(Ff(1)*ones(1,3), Ff(2)*ones(1,3), Ff(3)*ones(1,3), ...
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[d_unit_vector 0 0], [0 d_unit_vector 0], [0 0 d_unit_vector], '-', 'Color', [0 0.4470 0.7410])
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if args.labels
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text(Ff(1) + d_label, ...
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Ff(2) + d_label, ...
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Ff(3) + d_label, '$\{F\}$', 'Color', [0 0.4470 0.7410]);
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end
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end
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Fa = stewart.FO_A;
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if args.frames
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quiver3(Fa(1)*ones(1,3), Fa(2)*ones(1,3), Fa(3)*ones(1,3), ...
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[d_unit_vector 0 0], [0 d_unit_vector 0], [0 0 d_unit_vector], '-', 'Color', [0 0.4470 0.7410])
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if args.labels
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text(Fa(1) + d_label, ...
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Fa(2) + d_label, ...
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Fa(3) + d_label, '$\{A\}$', 'Color', [0 0.4470 0.7410]);
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end
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end
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if args.platforms && isfield(stewart, 'platforms') && isfield(stewart.platforms, 'Fpr')
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theta = [0:0.01:2*pi+0.01]; % Angles [rad]
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v = null([0; 0; 1]'); % Two vectors that are perpendicular to the circle normal
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center = [0; 0; 0]; % Center of the circle
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radius = stewart.platforms.Fpr; % Radius of the circle [m]
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points = center*ones(1, length(theta)) + radius*(v(:,1)*cos(theta) + v(:,2)*sin(theta));
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plot3(points(1,:), ...
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points(2,:), ...
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points(3,:), '-', 'Color', [0 0.4470 0.7410]);
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end
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if args.joints
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scatter3(stewart.Fa(1,:), ...
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stewart.Fa(2,:), ...
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stewart.Fa(3,:), 'MarkerEdgeColor', [0 0.4470 0.7410]);
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if args.labels
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for i = 1:size(stewart.Fa,2)
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text(stewart.Fa(1,i) + d_label, ...
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stewart.Fa(2,i), ...
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stewart.Fa(3,i), sprintf('$a_{%i}$', i), 'Color', [0 0.4470 0.7410]);
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end
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end
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end
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Fm = FTm*[0; 0; 0; 1]; % Get the position of frame {M} w.r.t. {F}
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if args.frames
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FM_uv = FTm*[d_unit_vector*eye(3); zeros(1,3)]; % Rotated Unit vectors
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quiver3(Fm(1)*ones(1,3), Fm(2)*ones(1,3), Fm(3)*ones(1,3), ...
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FM_uv(1,1:3), FM_uv(2,1:3), FM_uv(3,1:3), '-', 'Color', [0.8500 0.3250 0.0980])
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if args.labels
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text(Fm(1) + d_label, ...
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Fm(2) + d_label, ...
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Fm(3) + d_label, '$\{M\}$', 'Color', [0.8500 0.3250 0.0980]);
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end
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end
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FB = stewart.FO_A + args.AP;
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if args.frames
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FB_uv = FTm*[d_unit_vector*eye(3); zeros(1,3)]; % Rotated Unit vectors
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quiver3(FB(1)*ones(1,3), FB(2)*ones(1,3), FB(3)*ones(1,3), ...
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FB_uv(1,1:3), FB_uv(2,1:3), FB_uv(3,1:3), '-', 'Color', [0.8500 0.3250 0.0980])
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if args.labels
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text(FB(1) - d_label, ...
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FB(2) + d_label, ...
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FB(3) + d_label, '$\{B\}$', 'Color', [0.8500 0.3250 0.0980]);
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end
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end
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if args.platforms && isfield(stewart, 'platforms') && isfield(stewart.platforms, 'Mpr')
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theta = [0:0.01:2*pi+0.01]; % Angles [rad]
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v = null((FTm(1:3,1:3)*[0;0;1])'); % Two vectors that are perpendicular to the circle normal
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center = Fm(1:3); % Center of the circle
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radius = stewart.platforms.Mpr; % Radius of the circle [m]
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points = center*ones(1, length(theta)) + radius*(v(:,1)*cos(theta) + v(:,2)*sin(theta));
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plot3(points(1,:), ...
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points(2,:), ...
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points(3,:), '-', 'Color', [0.8500 0.3250 0.0980]);
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end
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if args.joints
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Fb = FTm*[stewart.Mb;ones(1,6)];
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scatter3(Fb(1,:), ...
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Fb(2,:), ...
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Fb(3,:), 'MarkerEdgeColor', [0.8500 0.3250 0.0980]);
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if args.labels
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for i = 1:size(Fb,2)
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text(Fb(1,i) + d_label, ...
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Fb(2,i), ...
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Fb(3,i), sprintf('$b_{%i}$', i), 'Color', [0.8500 0.3250 0.0980]);
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end
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end
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end
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if args.legs
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for i = 1:6
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plot3([stewart.Fa(1,i), Fb(1,i)], ...
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[stewart.Fa(2,i), Fb(2,i)], ...
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[stewart.Fa(3,i), Fb(3,i)], 'k-');
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if args.labels
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text((stewart.Fa(1,i)+Fb(1,i))/2 + d_label, ...
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(stewart.Fa(2,i)+Fb(2,i))/2, ...
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(stewart.Fa(3,i)+Fb(3,i))/2, sprintf('$%i$', i), 'Color', 'k');
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end
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end
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end
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view([1 -0.6 0.4]);
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axis equal;
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axis off;
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File diff suppressed because it is too large
Load Diff
@ -221,11 +221,62 @@ Then, define the inertia and geometry of the fixed base, mobile platform and str
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Finally, initialize the strut stiffness and damping properties.
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#+begin_src matlab
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stewart = initializeStrutDynamics(stewart, 'Ki', 1e6*ones(6,1), 'Ci', 1e2*ones(6,1));
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stewart = initializeJointDynamics(stewart, 'Ksi', zeros(6,1), 'Csi', zeros(6,1));
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stewart = initializeJointDynamics(stewart);
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#+end_src
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The obtained =stewart= Matlab structure contains all the information for analysis of the Stewart platform and for simulations using Simscape.
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The function =displayArchitecture= can be used to display the current Stewart configuration:
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#+begin_src matlab
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displayArchitecture(stewart);
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#+end_src
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#+header: :tangle no :exports results :results none :noweb yes
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#+begin_src matlab :var filepath="figs/stewart_architecture_example.pdf" :var figsize="wide-tall" :post pdf2svg(file=*this*, ext="png")
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<<plt-matlab>>
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#+end_src
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#+name: fig:stewart_architecture_example
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#+caption: Display of the current Stewart platform architecture ([[./figs/stewart_architecture_example.png][png]], [[./figs/stewart_architecture_example.pdf][pdf]])
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[[file:figs/stewart_architecture_example.png]]
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There are many options to show or hides elements such as labels and frames.
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The documentation of the function is available [[sec:displayArchitecture][here]].
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Let's now move a little bit the top platform and re-display the configuration:
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#+begin_src matlab
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tx = 0.1; % [rad]
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ty = 0.2; % [rad]
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tz = 0.05; % [rad]
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Rx = [1 0 0;
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0 cos(tx) -sin(tx);
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0 sin(tx) cos(tx)];
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Ry = [ cos(ty) 0 sin(ty);
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0 1 0;
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-sin(ty) 0 cos(ty)];
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Rz = [cos(tz) -sin(tz) 0;
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sin(tz) cos(tz) 0;
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0 0 1];
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ARB = Rz*Ry*Rx;
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AP = [0.08; 0; 0]; % [m]
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displayArchitecture(stewart, 'AP', AP, 'ARB', ARB);
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view([0 -1 0]);
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#+end_src
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#+header: :tangle no :exports results :results none :noweb yes
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#+begin_src matlab :var filepath="figs/stewart_architecture_example_pose.pdf" :var figsize="wide-tall" :post pdf2svg(file=*this*, ext="png")
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<<plt-matlab>>
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#+end_src
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#+name: fig:stewart_architecture_example_pose
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#+caption: Display of the Stewart platform architecture at some defined pose ([[./figs/stewart_architecture_example_pose.png][png]], [[./figs/stewart_architecture_example_pose.pdf][pdf]])
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[[file:figs/stewart_architecture_example_pose.png]]
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* Functions
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<<sec:functions>>
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** =initializeFramesPositions=: Initialize the positions of frames {A}, {B}, {F} and {M}
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@ -874,6 +925,259 @@ This Matlab function is accessible [[file:src/initializeJointDynamics.m][here]].
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end
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#+end_src
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** =displayArchitecture=: 3D plot of the Stewart platform architecture
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:PROPERTIES:
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:header-args:matlab+: :tangle src/displayArchitecture.m
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:header-args:matlab+: :comments none :mkdirp yes :eval no
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:END:
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<<sec:displayArchitecture>>
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This Matlab function is accessible [[file:src/displayArchitecture.m][here]].
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*** Function description
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:PROPERTIES:
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:UNNUMBERED: t
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:END:
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#+begin_src matlab
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function [] = displayArchitecture(stewart, args)
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% displayArchitecture - 3D plot of the Stewart platform architecture
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%
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% Syntax: [] = displayArchitecture(args)
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%
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% Inputs:
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% - stewart
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% - args - Structure with the following fields:
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% - AP [3x1] - The wanted position of {B} with respect to {A}
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% - ARB [3x3] - The rotation matrix that gives the wanted orientation of {B} with respect to {A}
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% - ARB [3x3] - The rotation matrix that gives the wanted orientation of {B} with respect to {A}
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% - frames [true/false] - Display the Frames
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% - legs [true/false] - Display the Legs
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% - joints [true/false] - Display the Joints
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% - labels [true/false] - Display the Labels
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% - platforms [true/false] - Display the Platforms
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%
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% Outputs:
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#+end_src
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*** Optional Parameters
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:PROPERTIES:
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:UNNUMBERED: t
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:END:
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#+begin_src matlab
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arguments
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stewart
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args.AP (3,1) double {mustBeNumeric} = zeros(3,1)
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args.ARB (3,3) double {mustBeNumeric} = eye(3)
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args.frames logical {mustBeNumericOrLogical} = true
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args.legs logical {mustBeNumericOrLogical} = true
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args.joints logical {mustBeNumericOrLogical} = true
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args.labels logical {mustBeNumericOrLogical} = true
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args.platforms logical {mustBeNumericOrLogical} = true
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end
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#+end_src
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*** Figure Creation, Frames and Homogeneous transformations
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:PROPERTIES:
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:UNNUMBERED: t
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:END:
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The reference frame of the 3d plot corresponds to the frame $\{F\}$.
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#+begin_src matlab
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figure;
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hold on;
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#+end_src
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We first compute homogeneous matrices that will be useful to position elements on the figure where the reference frame is $\{F\}$.
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#+begin_src matlab
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FTa = [eye(3), stewart.FO_A; ...
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zeros(1,3), 1];
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ATb = [args.ARB, args.AP; ...
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zeros(1,3), 1];
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BTm = [eye(3), -stewart.MO_B; ...
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zeros(1,3), 1];
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FTm = FTa*ATb*BTm;
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#+end_src
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Let's define a parameter that define the length of the unit vectors used to display the frames.
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#+begin_src matlab
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d_unit_vector = stewart.H/4;
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#+end_src
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Let's define a parameter used to position the labels with respect to the center of the element.
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#+begin_src matlab
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d_label = stewart.H/20;
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#+end_src
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*** Fixed Base elements
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:PROPERTIES:
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:UNNUMBERED: t
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:END:
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Let's first plot the frame $\{F\}$.
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#+begin_src matlab
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Ff = [0, 0, 0];
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if args.frames
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quiver3(Ff(1)*ones(1,3), Ff(2)*ones(1,3), Ff(3)*ones(1,3), ...
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[d_unit_vector 0 0], [0 d_unit_vector 0], [0 0 d_unit_vector], '-', 'Color', [0 0.4470 0.7410])
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if args.labels
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text(Ff(1) + d_label, ...
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Ff(2) + d_label, ...
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Ff(3) + d_label, '$\{F\}$', 'Color', [0 0.4470 0.7410]);
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end
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end
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#+end_src
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Now plot the frame $\{A\}$ fixed to the Base.
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#+begin_src matlab
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Fa = stewart.FO_A;
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if args.frames
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quiver3(Fa(1)*ones(1,3), Fa(2)*ones(1,3), Fa(3)*ones(1,3), ...
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[d_unit_vector 0 0], [0 d_unit_vector 0], [0 0 d_unit_vector], '-', 'Color', [0 0.4470 0.7410])
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if args.labels
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text(Fa(1) + d_label, ...
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Fa(2) + d_label, ...
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Fa(3) + d_label, '$\{A\}$', 'Color', [0 0.4470 0.7410]);
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end
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end
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#+end_src
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Let's then plot the circle corresponding to the shape of the Fixed base.
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#+begin_src matlab
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if args.platforms && isfield(stewart, 'platforms') && isfield(stewart.platforms, 'Fpr')
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theta = [0:0.01:2*pi+0.01]; % Angles [rad]
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v = null([0; 0; 1]'); % Two vectors that are perpendicular to the circle normal
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center = [0; 0; 0]; % Center of the circle
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radius = stewart.platforms.Fpr; % Radius of the circle [m]
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points = center*ones(1, length(theta)) + radius*(v(:,1)*cos(theta) + v(:,2)*sin(theta));
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plot3(points(1,:), ...
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points(2,:), ...
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points(3,:), '-', 'Color', [0 0.4470 0.7410]);
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end
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#+end_src
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Let's now plot the position and labels of the Fixed Joints
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#+begin_src matlab
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if args.joints
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scatter3(stewart.Fa(1,:), ...
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stewart.Fa(2,:), ...
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stewart.Fa(3,:), 'MarkerEdgeColor', [0 0.4470 0.7410]);
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if args.labels
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for i = 1:size(stewart.Fa,2)
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text(stewart.Fa(1,i) + d_label, ...
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stewart.Fa(2,i), ...
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stewart.Fa(3,i), sprintf('$a_{%i}$', i), 'Color', [0 0.4470 0.7410]);
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end
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end
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end
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#+end_src
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*** Mobile Platform elements
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:PROPERTIES:
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:UNNUMBERED: t
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:END:
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Plot the frame $\{M\}$.
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#+begin_src matlab
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Fm = FTm*[0; 0; 0; 1]; % Get the position of frame {M} w.r.t. {F}
|
||||
|
||||
if args.frames
|
||||
FM_uv = FTm*[d_unit_vector*eye(3); zeros(1,3)]; % Rotated Unit vectors
|
||||
quiver3(Fm(1)*ones(1,3), Fm(2)*ones(1,3), Fm(3)*ones(1,3), ...
|
||||
FM_uv(1,1:3), FM_uv(2,1:3), FM_uv(3,1:3), '-', 'Color', [0.8500 0.3250 0.0980])
|
||||
|
||||
if args.labels
|
||||
text(Fm(1) + d_label, ...
|
||||
Fm(2) + d_label, ...
|
||||
Fm(3) + d_label, '$\{M\}$', 'Color', [0.8500 0.3250 0.0980]);
|
||||
end
|
||||
end
|
||||
#+end_src
|
||||
|
||||
Plot the frame $\{B\}$.
|
||||
#+begin_src matlab
|
||||
FB = stewart.FO_A + args.AP;
|
||||
|
||||
if args.frames
|
||||
FB_uv = FTm*[d_unit_vector*eye(3); zeros(1,3)]; % Rotated Unit vectors
|
||||
quiver3(FB(1)*ones(1,3), FB(2)*ones(1,3), FB(3)*ones(1,3), ...
|
||||
FB_uv(1,1:3), FB_uv(2,1:3), FB_uv(3,1:3), '-', 'Color', [0.8500 0.3250 0.0980])
|
||||
|
||||
if args.labels
|
||||
text(FB(1) - d_label, ...
|
||||
FB(2) + d_label, ...
|
||||
FB(3) + d_label, '$\{B\}$', 'Color', [0.8500 0.3250 0.0980]);
|
||||
end
|
||||
end
|
||||
#+end_src
|
||||
|
||||
Let's then plot the circle corresponding to the shape of the Mobile platform.
|
||||
#+begin_src matlab
|
||||
if args.platforms && isfield(stewart, 'platforms') && isfield(stewart.platforms, 'Mpr')
|
||||
theta = [0:0.01:2*pi+0.01]; % Angles [rad]
|
||||
v = null((FTm(1:3,1:3)*[0;0;1])'); % Two vectors that are perpendicular to the circle normal
|
||||
center = Fm(1:3); % Center of the circle
|
||||
radius = stewart.platforms.Mpr; % Radius of the circle [m]
|
||||
|
||||
points = center*ones(1, length(theta)) + radius*(v(:,1)*cos(theta) + v(:,2)*sin(theta));
|
||||
|
||||
plot3(points(1,:), ...
|
||||
points(2,:), ...
|
||||
points(3,:), '-', 'Color', [0.8500 0.3250 0.0980]);
|
||||
end
|
||||
#+end_src
|
||||
|
||||
Plot the position and labels of the rotation joints fixed to the mobile platform.
|
||||
#+begin_src matlab
|
||||
if args.joints
|
||||
Fb = FTm*[stewart.Mb;ones(1,6)];
|
||||
|
||||
scatter3(Fb(1,:), ...
|
||||
Fb(2,:), ...
|
||||
Fb(3,:), 'MarkerEdgeColor', [0.8500 0.3250 0.0980]);
|
||||
|
||||
if args.labels
|
||||
for i = 1:size(Fb,2)
|
||||
text(Fb(1,i) + d_label, ...
|
||||
Fb(2,i), ...
|
||||
Fb(3,i), sprintf('$b_{%i}$', i), 'Color', [0.8500 0.3250 0.0980]);
|
||||
end
|
||||
end
|
||||
end
|
||||
#+end_src
|
||||
|
||||
*** Legs
|
||||
:PROPERTIES:
|
||||
:UNNUMBERED: t
|
||||
:END:
|
||||
Plot the legs connecting the joints of the fixed base to the joints of the mobile platform.
|
||||
#+begin_src matlab
|
||||
if args.legs
|
||||
for i = 1:6
|
||||
plot3([stewart.Fa(1,i), Fb(1,i)], ...
|
||||
[stewart.Fa(2,i), Fb(2,i)], ...
|
||||
[stewart.Fa(3,i), Fb(3,i)], 'k-');
|
||||
|
||||
if args.labels
|
||||
text((stewart.Fa(1,i)+Fb(1,i))/2 + d_label, ...
|
||||
(stewart.Fa(2,i)+Fb(2,i))/2, ...
|
||||
(stewart.Fa(3,i)+Fb(3,i))/2, sprintf('$%i$', i), 'Color', 'k');
|
||||
end
|
||||
end
|
||||
end
|
||||
#+end_src
|
||||
|
||||
*** Figure parameters
|
||||
#+begin_src matlab
|
||||
view([1 -0.6 0.4]);
|
||||
axis equal;
|
||||
axis off;
|
||||
#+end_src
|
||||
|
||||
* Bibliography :ignore:
|
||||
bibliographystyle:unsrt
|
||||
bibliography:ref.bib
|
||||
|
||||
Loading…
Reference in New Issue
Block a user