Phase angle,Physical noun, due tohigh polymerIt is elastic and viscous at the same time, so under the action of alternating stress field, its molecular chain segments are subject toInternal frictionThe deformation lags behind the stress changeAngular frequencyδ is calledphase differenceIs the phase angle.
Chinese name
phase angle
Foreign name
phase angle
Interpretation
The lagging angular frequency δ is called phase difference
The larger the phase angle is, the descriptionChain segmentThe more difficult it is to move, the less able it is to keep up with the changes of external forces.Generally, rigid molecules have small phase angles and flexible molecules have large phase angles.The size of the phase angle is also related to the external conditions, ifExternal force actionIf the frequency is low, the chain segment can move in time, and the phase angle is small;The frequency of external force is very high, the chain segment has no time to move, and the phase angle is small;Only when the frequency of the external force is not too high, the chain segment can move, but can not keep up, then it shows a large phase angle.Temperature has a similar effect.Therefore, the measurement of phase angle change can be used to characterize theflexibilityAnd the conditions andmolecular structureRelationship.
Noun application
Announce
edit
alternating currentInstantaneous valueOfexpressionMedium, sine (orcosine）The quantity after the symbol, which is equivalent to the angle, is called the phase angle of alternating current, also called the phasephaseOr appearance.For example, sinusoidal ACemfThe expression of instantaneous value e is:
e=Emsin(ωt+ψ0)
Where (ω t+ψ 0) is the phase angle of the sinusoidal alternating current EMF.When t=0, the phase angle is equal to ψ 0, which is calledInitial phase angle, short forPrimary phase。Two with the same frequencySine quantityThe difference of initial phase angle of is called phase angle difference or phase difference.Two whose phase angle difference is equal to zeroSine quantity, calledin-phase；The two sinusoidal quantities with a phase angle difference of 180 ° are called phase inversion;The two sine quantities whose phase angle difference is 90 ° are called orthogonal.
