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Encyclopedia > Eccentricity vector

In astrodynamics the eccentricity vector of a conic section orbit is the vector pointing towards the periapsis and with length equal to the orbit's scalar eccentricity.


Calculation

The eccentricity vector can be calculated from the orbital state vectors and at any time (the result is constant):

where:

Alternatively it can also be computed from orbital angular momentum vector h:

where:

See also


  Results from FactBites:
 
Method of measuring and compensating roll eccentricity of a rolling mill - Patent 5181408 (3548 words)
The on-line eccentricity compensation method is utilized for generating eccentricity compensation signals using the eccentricity vector established by the foregoing off-line eccentricity identification method, and for transferring the eccentricity compensation signals to an automatic gauge control (AGC) system for compensating the backup roll eccentricities and thus correcting the thickness variations of a rolling plate.
The present invention relates to a method of measuring and compensating the eccentricities of the backup rolls of a rolling mill for correcting the thickness variations of a rolling plate caused by the eccentricities of the backup rolls.
It is, therefore, an object of the present invention to provide a method of measuring and compensating the eccentricities of the backup rolls of a rolling mill to reduce the thickness variations of a rolling plate caused by the eccentricities of the backup rolls.
Optical fiber connector tuning wrench - Patent 6155146 (5549 words)
Rotation of the wrench thus causes rotation of the ferrule-barrel assembly to alter the angular orientation of the eccentricity vector of the ferrule.
This offset, which generally varies from connector to connector, is known as "eccentricity", and is defined as the distance between the longitudinal centroidal axis of the ferrule at the end face thereof and the centroidal axis of the optical fiber core held within the ferrule passage and is made up of three vectors.
Preferably the magnitude of the eccentricity relative to the ferrule axis is 1.8 to 3.5 microns.
  More results at FactBites »


 
 

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