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Group Members
Planning
| Week: |
|
| Feb 18 - Feb 24 |
|
| - Qualitative analysis of robot
|
| - Derivation of kinematics and dynamics (Leroy, Erik)
|
| - Preparation of first experiment session (Wouter, Koen)
|
| - Investigate different control-design
|
| - Group meeting
|
| Feb 25 - Mar 3 |
|
| - FRF-measurement and analyse (Wouter,Leroy (Tuesday))
|
| - Coupled/decoupled experiment (Wouter,Koen (Friday))
|
| - Nonlinearity experiment (Wouter,Koen (Friday))
|
| - Static friction experiment (Wouter,Koen (Friday))
|
| - Design of feedback-control (Iterative learning control) (All)
|
| - Group meeting (Friday)
|
| Mar 4 - Mar 10 |
|
| - Feedback-control Experiments(Erik, Koen)
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| - Discuss feedforward-control (All)
|
| - Group meeting
|
Progress
Week 1
- The first step in this project was to identify the pizza-robot by creating a list of all the (straightforward) (design) requirements of the pizza-robot (to design experiments) such as:
| - The pizza is not allowed to fall during transport, therefore the maximum acceleration (horizontally and vertically) is limited
|
| - The robot is not allowed to touch the pizza holding brackets, the trajectory design must prevent crashes
|
| - 3 pizza's must be transported and the pizzas must be transported as fast as possible (approx. 10-15 sec), and thus the fastest trajectory must be found
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| - The controller must stabilize the system
|
| - Controller output is limited, no saturation
|
| - The accuracy of the pizza-robot end-effector when obtaining a pizza from the brackets should be approx. 5mm
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| - Controller output is limited, keep saturation of motors in mind
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- A next step was to identify the limitations of the pizza-robot such as
| - Degrees of freedom to specify the workspace of the end-effector
|
| - The maximum input signals [V] of the motors of the pizza-robot and consequently the maximum velocity/acceleration of each joint
|
- To identify the pizza-robot in a more specific way:
| - The kinematics of the pizza-robot are derived which are helpfull for the trajectory design and determining the dynamics of the pizza-robot using the DH convention.
|
| - A simple model (dynamics) of the pizza-robot is determined to possibly use model-based control design (dynamics of the pizza-robot in terms of the generalized coordinates is difficult, consider a simple model for each joint seperately)
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| - FRF-measurement experiments are prepared (designing a ref. trajectory, a stabilizing controller)
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- Different types of feedback-control are considered which are usable (and possible with the knowledge of the groupmembers)
Week 2
- As already mentioned in week 1, a simple model is proposed to (possibly) use for model-based control design instead of the dynamics of the pizza-robot in terms of its generalized coordinates since this is too complex and not usable as model-based control design. (for every joint a model, with disturbances from other joints)
- FRF-measurements are performed of each joint with a stabilizing controller and a specific reference trajectory, however large friction is encountered which seems to be not constant along the trajectory of each joint. This influence the FRF-measurements at low frequency.