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# CONTROL SYSTEM

 A system in which one or more outputs are forced to change in a desired manner as time progresses.

## Related Terms

The modification of a controller to allow for time delays between the input to a control system and the response to the signal.

1. The time interval between a change in the input signal to a process control system and the response to the signal.
2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

### AUTOMATIC-CONTROL STABILITY

The property of an automatic control system whose performance is such that the amplitude of transient oscillations decreases with time and the system reaches a steady state.

### MEAN-SQUARE-ERROR CRITERION

Evaluation of the performance of a control system by calculating the square root of the average over time of the square of the difference between the actual output and the output that is desired.

### LAGRANGIAN DENSITY

For a dynamical system of fields or continuous media, a function of the fields, of their time and space derivatives, and the coordinates and time, whose integral over space is the Lagrangian.

### CONTACTOR CONTROL SYSTEM

A feedback control system in which the control signal is a discontinuous function of the sensed error and may therefore assume one of a limited number of discrete values.

### AUTOMATIC CONTROL SYSTEM

A control system having one or more automatic controllers connected in closed loops with one or more processes. Also known as regulating system.

### LOOP GAIN

1. The ratio of the magnitude of the primary feedback signal in a feedback control system to the magnitude of the actuating signal. 2. Total usable power gain of a carrier terminal or two-wire repeater; maximum usable gain is determined by, and may not exceed, the losses in the closed path.

### AUTOMATIC CHECK-OUT SYSTEM

A system utilizing test equipment capable of automatically and simultaneously providing actions and information which will ultimately result in the efficient operation of tested equipment while keeping time to a minimum.

### BASELINE DELAY

The time interval needed for the signal from a master station of a hyperbolic radionavigation system to travel the length of the baseline, introduced as a delay between transmission of the master and slave (or secondary) signals to make it possible to distinguish between the signals and to permit measurement of time differences.

### Related questions

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