In
systems theory, a
system
A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its open system (systems theory), environment, is described by its boundaries, str ...
is said to be transient or in a transient state when a
process variable or variables have been changed and the system has not yet reached a
steady state. In
electrical engineering
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems that use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the l ...
, the time taken for an
electronic circuit
An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or Conductive trace, traces through which electric current can flow. It is a t ...
to change from one steady state to another steady state is called the transient time.
Examples
Chemical Engineering
When a
chemical reactor is being brought into operation, the concentrations, temperatures, species compositions, and reaction rates are changing with time until operation reaches its nominal process variables.
Electrical engineering
When a
switch is closed in an electrical circuit containing a
capacitor or
inductor, the component draws out the resulting change in voltage or current, causing the system to take a substantial amount of time to reach a new
steady state. This period of time is known as the transient state.
A capacitor acts as a
short circuit immediately after the switch is closed, increasing its
impedance during the transient state until it acts as an open circuit in its steady state.
An inductor is the opposite, behaving as an open circuit until reaching a short circuit steady state.
See also
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Attractor
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Carrying capacity
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Control theory
Control theory is a field of control engineering and applied mathematics that deals with the control system, control of dynamical systems in engineered processes and machines. The objective is to develop a model or algorithm governing the applic ...
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Dynamical system
In mathematics, a dynamical system is a system in which a Function (mathematics), function describes the time dependence of a Point (geometry), point in an ambient space, such as in a parametric curve. Examples include the mathematical models ...
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Ecological footprint
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Economic growth
In economics, economic growth is an increase in the quantity and quality of the economic goods and Service (economics), services that a society Production (economics), produces. It can be measured as the increase in the inflation-adjusted Outp ...
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Engine test stand
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Equilibrium point
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List of types of equilibrium
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Evolutionary economics
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Growth curve
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Herman Daly
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Homeostasis
In biology, homeostasis (British English, British also homoeostasis; ) is the state of steady internal physics, physical and chemistry, chemical conditions maintained by organism, living systems. This is the condition of optimal functioning fo ...
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Lead-lag compensator
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Limit cycle
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Limits to Growth
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Population dynamics
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Race condition
A race condition or race hazard is the condition of an electronics, software, or other system where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events, leading to unexpected or inconsistent ...
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Simulation
A simulation is an imitative representation of a process or system that could exist in the real world. In this broad sense, simulation can often be used interchangeably with model. Sometimes a clear distinction between the two terms is made, in ...
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State function
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Steady state
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Steady state economy
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Steady State theory
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Systems theory
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Thermodynamic equilibrium
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Transient modelling
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Transient response
References
Chemical process engineering
Electrical engineering
Systems theory
Control theory
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