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Qu'est-ce (qui) est critical speed - définition
Critical Speed
(a) The speed of rotation at which a series dynamo begins to excite its
own field.
(b) In a compound wound dynamo, the speed at which the same potential is
generated with the full load being taken from the machine, as would be
generated on open circuit, in which case the shunt coil is the only
exciter. The speed at which the dynamo is self-regulating.
(c) In a dynamo the rate of speed when a small change in the speed of
rotation produces a comparatively great change in the electro-motive
force. It corresponds to the same current (the critical current) in any
given series dynamo.
given series dynamo.
Critical speed
In solid mechanics, in the field of rotordynamics, the critical speed is the theoretical angular velocity that excites the natural frequency of a rotating object, such as a shaft, propeller, leadscrew, or gear. As the speed of rotation approaches the object's natural frequency, the object begins to resonate, which dramatically increases system vibration.
Critical theory
PHILOSOPHY THAT SOCIOLOGICAL UNDERSTANDING'S PRIMARILY USE SHOULD BE SOCIAL REFORM
Critical social theory; Critical theorists; Critical sociology; Crtical theory; Critical theorist; Critical Theory; Critical Sociology; Critical-theory; Frankfurt Critical Theory; Social critical theory; Literary critical theory; Critical Theorist; Contemporary theory; Critical theories; Critical studies
A critical theory is any approach to social philosophy that focuses on reflective assessment and critique of society and culture to reveal and challenge power structures. With roots in sociology and literary criticism, it argues that social problems stem more from social structures and cultural assumptions than from individuals.
Wikipédia
Critical speed
In solid mechanics, in the field of rotordynamics, the critical speed is the theoretical angular velocity that excites the natural frequency of a rotating object, such as a shaft, propeller, leadscrew, or gear. As the speed of rotation approaches the object's natural frequency, the object begins to resonate, which dramatically increases system vibration.
