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Setting wheel velocity control without oscillation ?

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Hello altruists, I am having a hard time in simulation of a robot in Gazebo, all other joints are position control only wheel is velocity control. but in my robot is not jittering on surface. My goal is to move it smoothly over horizontal or sloped surface. What is better way to control velocity?Whole robot weights 130 Kg in simulation. I cant use skid steer or differential drive transmission as wheel separation varies. In the URDF: 1e+131.02.91.450.00.001transmission_interface/SimpleTransmissionhardware_interface/EffortJointInterfacehardware_interface/EffortJointInterface11 in the joint control configuration: omega_front_left_velocity_controller: type: effort_controllers/JointVelocityController joint: omega_front_left pid: {p: 5000.0, i: 0.01, d: 0.0} ![image description](/upfiles/15362406762006298.png) any suggestion is welcome.

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