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Because of the nonholonomic constraints, wheeled mobile robots have restrictions in mobility and typically cannot be controlled by linear controllers.
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Air pressure is controlled by linear control methods to keep the balancing in the roll direction.
For robustness, the used IBC for fuel cell voltage regulation is controlled by linear quadratic regulator (LQR).
In the last decades it became clear that cell behavior is far from being "controlled" by linear (digital) "commands" but rather by complex networks of molecular interactions and biophysical cues, spanning across different levels of structural and functional organization.
The question of interest for many control engineers is: "When can a nonlinear process be controlled by a linear controller with the intended controller performance?" This question, which has received a great deal of interest over the last 10 years, remains open.
Such behavior cannot be controlled by standard linear systems approach and instead they must be treated as a multidimensional system, i.e. information propagation in more than one independent direction.
By selecting proper manipulated variables, the PEMFC does not exhibit sign change in gain and hence can be controlled by using a linear controller.
The result can be oscillations in the pass-to-pass direction that cannot be controlled by direct application of standard, or 1D linear systems theory.
By attaching this drive mechanism, the wheelchair could be electrically operated, and the stretching and shrinking of the linear actuator could be controlled by the user with a switch.
This suggests that the recovery rate is partially controlled by the ash thickness but that this relationship is non-linear and may be controlled by threshold values.
The researchers based their system on Marc Raibert's hopping controller and it's controlled by a linear elastic actuator in parallel or LEAP joint.
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