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reference frame

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reference frame

 or frame of reference

Coordinate system that allows description of time and position of points relative to a body. The axes, or lines, emanate from a position called the origin. As a point moves, its velocity can be described in terms of changes in displacement and direction. Reference frames are chosen arbitrarily. For example, if a person is sitting in a moving train, the description of the person's motion depends on the chosen frame of reference. If the frame of reference is the train, the person is considered to be not moving relative to the train; if the frame of reference is the Earth, the person is moving relative to the Earth.


reference frame [′ref·rəns ‚frām]
(physics)


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In order to do this, notice that the shear stresses giving the second one of the quantities from equation (8) can be taken as a vector on the octahedral plane, in a reference frame represented by the principal directions of the stress.
The transmitter served as a global reference frame and was fixed to a rigid plastic base and oriented such that it was level and its coordinate axes were aligned with the cardinal planes of the human body.
Ansys v10 can also account for inertia in rotating structures during modal, transient, and harmonic analysis, in either a stationary or rotating reference frame.
 
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