eccentric


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eccentric,

in mechanics, device for changing rotary to back-and-forth motion. A disk is mounted off center on a shaft. One flat, open, circular end of a rod fits around the edge of the disk; the other end is usually attached to a block that slides in a slot. As the shaft rotates the block slides back and forth, carrying along whatever is attached to it, e.g., a valve. The distance between the center of the shaft and the center of the disk is the eccentricity. The so-called throw may mean either the eccentricity or the distance the block moves, which is twice the eccentricity. Camscam,
mechanical device for converting a rotating motion into a reciprocating, or back-and-forth, motion, or for changing a simple motion into a complex one. A simple form of cam is a circular disk set eccentrically on a shaft in order to induce (when the shaft rotates) a rising
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 and crankscrank,
mechanical linkage consisting of a bar attached to a pivot at one of its ends in such a way that it is capable of rotating through a complete circle about the pivot.
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 perform the same function as the eccentric, which designers often prefer to the crank for short motions.

Eccentric

Not having the same center or center line; departing or deviating from the conventional or established norm.

Eccentric

(religion, spiritualism, and occult)

In astronomy, eccentricity refers to an elliptical orbit, specifically to the extent to which the ellipse described by a celestial body’s orbit departs from a perfect circle, expressed by the ratio of the major to the minor axis.

Eccentric

 

in astronomy, an auxiliary circle in the geocentric system of the world, introduced by Hipparchus to represent the annual revolution of the sun around the earth through motion along a circle with constant angular velocity. The nonuniformity of the sun’s motion along the ecliptic was attributed to the fact

Figure 1

that the sun moved (uniformly) along the circumference of an eccentric, whose center C did not coincide with the earth T (see Figure 1).


Eccentric

 

a circular disk whose axis of rotation does not coincide with its geometric center. In cam mechanisms, an eccentric, acting upon a rod that moves in a straight line, communicates to the rod a harmonic motion such that the displacement of the rod is proportional to the cosine (or sine) of the eccentric’s rotation angle. In linkage, an eccentric acts as a crank, that is, as a link that makes a complete revolution around its axis of rotation. Such an application of an eccentric is efficient when the crank (its throw equal to the eccentricity of an eccentric) must be very short. Eccentrics are also used in lathe attachments to clamp details that are being machined.

eccentric

[ek′sen·trik]
(science and technology)
Situated to one side with reference to a center.

eccentric

eccentric head and shaft
Not having the same center or center line.

eccentric

1. situated away from the centre or the axis
2. not having a common centre
3. a device for converting rotary motion to reciprocating motion
References in periodicals archive ?
The boundary conditions of models of air bearing eccentric cross gap are mainly pressure inlet boundary, pressure outlet boundary, and solid wall boundary.
The mean reciprocal ratios were calculated for both concentric and eccentric internal and external shoulder rotation on the dominant and non-dominant sides (Table 3).
Each subject executed a familiarization session that consisted of maximal isometric voluntary contractions at different knee joint angles and concentric and eccentric contractions at different angular velocities.
This collision or near-collision might have ejected one planet from the system entirely and pushed HD 20782 on its eccentric path.
Display of durability depending on the load on the press with prestressed anchors loaded by eccentric and centric force
ECCENTRIC TRAINING REGIMEN: The patients were instructed to do their eccentric exercises, 7 days/week, for 12 weeks.
Therefore, potential exists for glutamine homeostasis to be disturbed following eccentric exercise, manifested as a reduction in muscle and/or plasma glutamine concentration [26,27].
eccentric reaming using a non-augmented glenoid (Equinoxe standard pegged), 2.
Many studies have found that strengthening the hamstring in a specific eccentric way have shown positive steps in reducing hamstring injuries.
Tyler President Florian Festge said, "Our double eccentric technology has been so effective that customers expressed the need for larger screens as their operations grew.
In eccentric-focused exercise training, the concentric phase of the movement is still done, but the focus is put on the eccentric phase.
The main problem, for field calculations, is that eccentricity is not a controllable parameter, except in highly deviated wells where it is reasonable to assume fully eccentric geometry.