Where does governor collide?

A device that holds a machine's speed nearly steady as its load or driving power varies, most often by using the outward swing of spinning weights to throttle the power supply: the classic flyball governor was fitted to steam engines by James Watt in 1788. James Clerk Maxwell's 1868 paper On governors gave the first mathematical analysis of such devices, deriving the conditions under which a governor settles smoothly rather than hunting, and it is now read as a founding text of control theory. The referent here is a physical feedback mechanism that regulates rotational speed, not the elected head of a region, a proposed neural limit on exertion, or a software rule for processor clock speed.[1]

Unit

One speed-regulating mechanism on a rotating machine, scaled by the speed band it holds

Recovery means

The governor returns the machine toward its set speed after each disturbance in load or power

Measured by

Assessed by how tightly it holds the set speed and by its stability, whether it settles or oscillates (hunts)

A hypothesised regulator, sited in the heart or brain, that limits how hard a person can exercise so the body is protected from damage before its true physical limit is reached. Archibald Hill, C. N. H. Long, and H. Lupton proposed such a governor in 1924, suggesting a mechanism that caps cardiac output during severe exertion; Timothy Noakes and colleagues revived and extended the idea in 2005 as the central governor model, placing the regulator in the brain. The referent is a proposed physiological control system for fatigue, not an engine's speed device, an elected executive, or a computer's clock-speed policy.[2][3]

Unit

One proposed regulatory mechanism limiting exercise intensity in the body

Recovery means

The proposed governor eases its limit as recovery restores the body's reserves

Measured by

Inferred from patterns of pacing, power output, and physiological signals during and after exhausting exercise