Next-generation military aircraft must be able to handle highly transient thermal loads that exceed the ability of current aircraft thermal subsystems. Vapor compression cycle systems (VCS) are an attractive solution for dealing with this challenge, but there are significant control challenges associated with their application to aircraft. Modern control techniques are likely required for the use of VCS in the presence of highly transient loads. This paper designs a linear quadratic regulator for a simple VCS architecture, and compares performance with a traditional PI controller. Our results show the performance improvements associated with LQG control in a simulated disturbance rejection case study.
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