Center of pressure

Center of pressure
Center Cen"ter, n. [F. centre, fr. L. centrum, fr. round which a circle is described, fr. ? to prick, goad.] 1. A point equally distant from the extremities of a line, figure, or body, or from all parts of the circumference of a circle; the middle point or place. [1913 Webster]

2. The middle or central portion of anything. [1913 Webster]

3. A principal or important point of concentration; the nucleus around which things are gathered or to which they tend; an object of attention, action, or force; as, a center of attaction. [1913 Webster]

4. The earth. [Obs.] --Shak. [1913 Webster]

5. Those members of a legislative assembly (as in France) who support the existing government. They sit in the middle of the legislative chamber, opposite the presiding officer, between the conservatives or monarchists, who sit on the right of the speaker, and the radicals or advanced republicans who occupy the seats on his left, See {Right}, and {Left}. [1913 Webster]

6. (Arch.) A temporary structure upon which the materials of a vault or arch are supported in position until the work becomes self-supporting. [1913 Webster]

7. (Mech.) (a) One of the two conical steel pins, in a lathe, etc., upon which the work is held, and about which it revolves. (b) A conical recess, or indentation, in the end of a shaft or other work, to receive the point of a center, on which the work can turn, as in a lathe. [1913 Webster]

Note: In a lathe the

{live center} is in the spindle of the head stock; the

{dead center} is on the tail stock.

{Planer centers} are stocks carrying centers, when the object to be planed must be turned on its axis. [1913 Webster]

{Center of an army}, the body or troops occupying the place in the line between the wings.

{Center of a curve} or {Center of a surface} (Geom.) (a) A point such that every line drawn through the point and terminated by the curve or surface is bisected at the point. (b) The fixed point of reference in polar co["o]rdinates. See {Co["o]rdinates}.

{Center of curvature of a curve} (Geom.), the center of that circle which has at any given point of the curve closer contact with the curve than has any other circle whatever. See {Circle}.

{Center of a fleet}, the division or column between the van and rear, or between the weather division and the lee.

{Center of gravity} (Mech.), that point of a body about which all its parts can be balanced, or which being supported, the whole body will remain at rest, though acted upon by gravity.

{Center of gyration} (Mech.), that point in a rotating body at which the whole mass might be concentrated (theoretically) without altering the resistance of the intertia of the body to angular acceleration or retardation.

{Center of inertia} (Mech.), the center of gravity of a body or system of bodies.

{Center of motion}, the point which remains at rest, while all the other parts of a body move round it.

{Center of oscillation}, the point at which, if the whole matter of a suspended body were collected, the time of oscillation would be the same as it is in the actual form and state of the body.

{Center of percussion}, that point in a body moving about a fixed axis at which it may strike an obstacle without communicating a shock to the axis.

{Center of pressure} (Hydros.), that point in a surface pressed by a fluid, at which, if a force equal to the whole pressure and in the same line be applied in a contrary direction, it will balance or counteract the whole pressure of the fluid. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Center of pressure — Pressure Pres sure (?; 138), n. [OF., fr. L. pressura, fr. premere. See 4th {Press}.] 1. The act of pressing, or the condition of being pressed; compression; a squeezing; a crushing; as, a pressure of the hand. [1913 Webster] 2. A contrasting… …   The Collaborative International Dictionary of English

  • Center of pressure — The center of pressure is the point on a body where the sum total of the aerodynamic pressure field acts, causing a force and no moment about that point. Mathematically it can be said that the net pressure force on the body acts through this… …   Wikipedia

  • center of pressure — The point, usually on the chord line, through which the total reaction (sum total of all aerodynamics forces) may be considered to act. The center of pressure is not a fixed point but moves with changes to the angle of attack …   Aviation dictionary

  • center of pressure — slėgimo centras statusas T sritis automatika atitikmenys: angl. center of pressure vok. Angriffsmittelpunkt, m; Druckmittelpunkt, m; Druckpunkt, m rus. центр давления, m pranc. centre de poussée, m …   Automatikos terminų žodynas

  • center of pressure — slėgio centras statusas T sritis fizika atitikmenys: angl. center of pressure vok. Druckmittelpunkt, m rus. центр давления, m pranc. centre de pression, m …   Fizikos terminų žodynas

  • center of pressure — An aerodynamically determined point at which wind force on the side of a vehicle is assumed to be concentrated for analytical purposes. It is a function of the shape and aerodynamic drag (resistance) of an automobile s body shell, determines the… …   Dictionary of automotive terms

  • center of pressure — 1. of an airfoil section : the point in the chord (prolonged if necessary) that is at the intersection of the chord and the line of action of the resultant air force 2. : the point of a surface exposed to external pressure (as of a fluid) at… …   Useful english dictionary

  • center of pressure — area where the pressure is greatest …   English contemporary dictionary

  • center-of-pressure travel — i. The linear distance the center of pressure travels along a chord over the entire range of angles of attack, ignoring the effects of compressibility and subsonic flow. The center of pressure moves forward as the angle of attack increases until… …   Aviation dictionary

  • center-of-pressure coefficient — The ratio of the distance of the center of pressure from the leading edge of an airfoil to its chord length …   Aviation dictionary

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