Skip to content

Joint Constraints Not Respected during Trajectory Optimization #2

@chuazh

Description

@chuazh

using the psm_fontanelli notebook, I tried to generate an optimal trajectory while setting the joint constraints for joint 1 with a "psm_simplified" model:

from numpy import deg2rad

optimal_trajectory_folder = 'data/optimal_trajectory/'
trajectory_folder = 'data/' + model_name +'/optimal_trajectory/'

base_freq = 0.18
fourier_order = 6

joint_constraints = []
cartesian_constraints = []

if model_name == 'psm_simplified':
    q_dvrk7 = 1.2177*q7 - 1.2177*q6
#     q_mod6 = (4871*q6)/4000 - (4153*q5)/5000
#     q_mod7 = - (4153*q5)/5000 + (4871*q7)/4000
    
    q_dvrk5 = 1.0186 * q5
    q_mod6 = -0.8306 * q5 + 1.2178 * q6
    q_mod7 = -0.8306 * q5 + 1.2178 * q7
    
    joint_constraints = [(q1, 0, 1.45, -1.7, 1.7), #old value is -1.45 to 1.45
                         (q2, -0.75, 0.8, -1.7, 1.7),
                         (q3,0.07,0.235,-0.35,0.35),
                         (q4,-1.5,1.5,-2,2),
                         (q_dvrk5,-1.4,1.4,-2,2), 
                         (q_dvrk7, 0.15, 3,-3,3),
                         (q_mod7, -1.5, 1.5,-2,2),
                          (q_mod6, -1.5, 1.5,-2,2)]
else:
    raise Exception("No robot name matches " + model_name)
    
traj_optimizer = TrajOptimizer(robot_model, fourier_order, base_freq,
                               joint_constraints=joint_constraints,
                               cartesian_constraints = cartesian_constraints)
                                                                                                 
                                                                                                                     
traj_optimizer.optimize()

however after running the optimization I find that the max and min joint angle 4.6rad. I believe such a large range causes my dvrk to trip as the joint limits are exceeded during the recording of the training data. Hope someone can verify my findings.

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions