regulable

Regulable is an adjective used to describe something that can be regulated or adjusted to a desired value. The term is common in Spanish and French contexts (régulable/regulable) and appears in discussions of devices, systems, and processes designed for adjustment. In English technical writing, the concept is usually referred to as regulability, or described through related ideas such as controllability.

In practical engineering, regulable often describes equipment whose output or behavior can be set or tuned. Examples include regulable voltage sources or power supplies (adjustable output voltage), regulable temperature controls, and regulators with user-set thresholds. Regulatory devices may involve mechanical, electronic, or software-based controls enabling a range of output values.

In control theory, regulability (regulability) denotes the ability to steer a system’s state to a desired value via inputs. It is closely related to controllability. For linear time-invariant systems, a standard criterion is that the controllability matrix [B, AB, A^2B, ..., A^{n-1}B] has full rank, indicating the system can reach any state from any initial condition under appropriate inputs. In practice, actuator limits, disturbances, and nonlinear dynamics can affect true regulability.

See also: controllability, regulability, regulator, adjustable device.