American Society of Mechanical Engineers .


Related Terms

BOILER AND PRESSURE VESSEL CODE

An ASME code, The Boiler and Pressure Vessel Code establishes rules of safety governing the design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction.

POINT CONTACT

A contact between a specially prepared semiconductor surface and a metal point, usually maintained by mechanical periphery.

PNEUMATIC CONTROLLER

A device for the mechanical movement of another device (such as a valve stem) whose action is controlled by variations in pneumatic pressure connected to the controller.

PLASTIC COLLISION

A collision in which one or both of the colliding bodies suffers plastic deformation and mechanical energy is dissipated.

PIEZOJUNCTION EFFECT

A change in the current-voltage characteristic of a pn junction that is produced by a mechanical stress.

PIEZOELECTRIC TRANSDUCER

A piezoelectric crystal used as a transducer, either to convert mechanical or acoustical signals to electric signals, as in a microphone, or vice versa, as in ultrasonic metal inspection.

PIEZOELECTRIC ELEMENT

A piezoelectric crystal used in an electric circuit, for example, as a transducer to convert mechanical or acoustical piezoelectric element piezoelectric gage signals to electric signals, or to control the frequency of a crystal oscillator.

PICKOFF

1. A device used to convert mechanical motion into a proportional electric signal. 2. A mechanical device for automatic removal of the finished part from a press die.

PHONON FRICTION

Friction that arises when atoms close to a surface are set into motion by the sliding action of atoms in an opposing surface, and the mechanical energy needed to slide one surface over the other is thereby converted to the energy of atomic lattice vibrations (phonons) and is eventually transformed into heat.

PASSIVE SOLAR SYSTEM

A solar heating or cooling system that operates by using gravity, heat flows, or evaporation rather than mechanical devices to collect and transfer energy.

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