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Physics the condition of a system when some or all of the quantities describing it are independent of time but not necessarily in thermodynamic or chemical equilibrium

(in some contexts, stationary state), in physics, a state of a physical system in which some quantities significant for characterizing the system (different quantities in different cases) do not vary with time. For example, the state of flow of a fluid is a steady state if the rate of motion and other characteristics remain invariant at each point in space. In quantum mechanics, a state in which the energy has a specific and time-invariant value is called a stationary state. (SeeOPEN SYSTEMS and PRIGOGINETHEOREM regarding steady states in thermodynamics.) The state of a system is quasi-stationary (in thermodynamics, quasi-static) if those quantities that, if constant, would make the state a steady state change slowly with time. Here, the relations between various properties of the system remain approximately the same as in a steady state.

the state to which a mechanism or system returns after the occurrence of a transient produced by a perturbation or an initial deviation in the system’s coordinates.

Examples of steady states in linear systems include the rotation of an engine at some fixed rate with a constant load applied to the shaft, harmonic oscillations in an oscillatory circuit, and the operation of an automatic control system with constant perturbations and control inputs. The steady state of a dynamic system is characterized by having the forces acting on the system compensated by a corresponding counteraction. For example, the motion of a rotating mechanism is described by the equation Md = Mr, where Md is the driving torque and Mr is the resisting torque. For a body being heated, Qh = Qd, where Qh and Qd represent, respectively, the amount of heat absorbed by the body during heating and the amount dissipated to the environment. In an oscillatory circuit, Ws = Wh, where Ws and Wh are, respectively, the amount of energy supplied from a power source during one period of the oscillation and the amount evolved as heat in the resistance of the circuit.

[′sted·ē ′stāt]
(physics)
The condition of a body or system in which the conditions at each point do not change with time, that is after initial transients or fluctuations have disappeared.
References in periodicals archive ?
Gross yield has remained steady for the past few years, and Fitch has revised its gross yield steady state to 13.
Eusepi accepted the nonlinear nature of Figure 1 with its two steady states.
Intertemporal Equilibrium Dynamics and Existence of Steady States
One of the steady states has inflation equal to the targeted inflation rate [pi]*, and the other steady state has a lower inflation rate.
However, in this environment, not all candidate steady-state equilibria necessarily satisfy Equation (16), and hence, not all values of z satisfying Equation (17) constitute legitimate steady states.
The first is whether or not a decentralized dynamic economy with multiple steady states will reach one of the steady states.
LST identifies seven general types of adjustment processes used to maintain steady states.
5) There are thus three steady states in the model, provided fiscal policy is set so that the process for real bonds [b.
I conducted studies in Albuquerque, New Mexico, to ascertain the baseline or steady state amount of metallic lead found in urban streets, the rate of lead deposition, and the rate of lead abrasion.
To be able to make the necessary calculations, this section ignores transition paths between steady states.
The OECD countries are likely at or near the steady state, with small changes in steady states due to small changes in savings or population growth rates.
In the first stage, the world could be described as countries approaching to equal (absolute convergence) or to different (conditional convergence) steady states.

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