A long, straight beam that functions essentially as a cantilevered beam by the insertion of two hinges in alternate spans.


Related Terms

DEFLECTION

  1. The displacement of an electron beam from its straight-line path by an electrostatic or electromagnetic field.
  2. Shape change or reduction in the diameter of a conduit, produced without fracturing the material.
  3. Elastic movement or sinking of a loaded structural member, particularly of the mid-span of a beam.

PHOTOTUBE CURRENT METER

A device for measuring the speed of water currents in which a perforated disk, which rotates with the current by means of a propeller, is placed in the path of a beam of light that is then reflected from a mirror onto a phototube.

PENETROMETER

1. An instrument that measures the penetrating power of a beam of xrays or other penetrating radiation. 2. An instrument used to determine the consistency of a material by measurement of the depth to which a standard needle penetrates into it under standard conditions.

PANORAMIC RADAR

Nonscanning radar which transmits signals over a wide beam in the direction of interest.

OPTOELECTRONIC SHUTTER

A shutter that uses a Kerr cell to modulate a beam of light.

OPTICAL MICROPHONE

[ENG ACOUS] A microphone in which the motion of a membrane is detected using a light beam reflected from it, either with the aid of an interferometer or by detecting the deflection of the beam.

OPTICAL INDICATOR

An instrument which makes a plot of pressure in the cylinder of an engine as a function of piston (or volume) displacement, making use of magnification by optical systems and photographic recording; for example, the small motion of a pressure diaphragm may be transmitted to a mirror to deflect a beam of light.

NEUTRAL SURFACE

A surface in a bent beam along which material is neither compressed nor extended.

NEUTRAL AXIS

In a beam bent downward, the line of zero stress below which all fibers are in tension and above which they are in compression.

MOMENT DIAGRAM

A graph of the bending moment at a section of a beam versus the distance of the section along the beam.

Related questions

MarineProHelp 2018 - 2020