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A passivity based controller, designed with reasonable passive outputs reference trajectories, is shown to be unsuitable, dueto unrealistic reactant concentration and temperature controller profiles in the unrestricted controls case, or, due to controller saturation, and convergence to undesirable equilibria, when hard constraints are imposed on the control input signals.
However, practical implementation of robust control can be fragile due to controller inaccuracies (tolerance of resistors used with operational amplifiers).
According to an Infoworld story, DRAMeXchange Technology found that there exists a "wide disparity" of quality in SSDs, due to controller chips, NAND chips, and firmware.
Trajectories of sensitive modes due to controller gain variations were evaluated in order to determine the stability boundaries.
There is a gradual decline in precision for smaller attenuation values for both the experimental and the simulation results (see Figure 8), this may be due to controller sub-optimally starting to make the system go unstable.
Due to the strong advances in chip technology, bottlenecks due to controller, bus, memory, and processor performance are much smaller in more recent systems, putting in evidence the mechanical properties and restrictions of hard disks.
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However, a potential disadvantage is a reduction in achievable control performance due to restricted controller structure.
The neural network controller contains three neurons and six connection weights implying a small search space implying faster optimization time due to few controller parameters.
It also considers non-minimum phase aspects by avoiding the introduction of right-half plane transmission zeros due to the controller elements.
A DVFS controller was added to the design to adjust the clock frequency and the supply voltage level, but the area and overhead in terms of the power consumption due to the controller turned out to be negligibly small, 2.3 and 0.002%, respectively.
This results in a trade-off between safety and the performance due to the controller avoiding the region with large variance at the cost of not tracking the set point to ensure process safety.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com