actuator


Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Wikipedia.

actuator

[′ak·chə‚wād·ər]
(control systems)
A mechanism to activate process control equipment by use of pneumatic, hydraulic, or electronic signals; for example, a valve actuator for opening or closing a valve to control the rate of fluid flow.
(engineering acoustics)
An auxiliary external electrode used to apply a known electrostatic force to the diaphragm of a microphone for calibration purposes. Also known as electrostatic actuator.
(mechanical engineering)
A device that produces mechanical force by means of pressurized fluid.
(ordnance)
Part of the receiver mechanism in certain types of automatic weapons.

actuator

actuatorclick for a larger image
A mechanical, electrical, or hydraulic device, or their combination, used to effect some predetermined linear, rotary, or oscillating movement. An actuator essentially converts hydraulic or air pressure into mechanical force. Basically, there are two types of actuators: single-acting and double-acting. In the single-acting actuator, the piston moves in a single direction as a result of system pressure. In a double-acting system, the actuator's piston moves in either direction. The fluid enters from one side of the piston and is drained out of the other. The double-acting actuator may be balanced or unbalanced. In the former case, movement in both directions is equal, whereas in the latter case, the movement to one side is greater than the other.

actuator

A mechanism that causes a device to be turned on or off, adjusted or moved. The motor and mechanism that moves the head assembly on a disk drive or an arm of a robot is called an actuator. See access arm.
References in periodicals archive ?
The report focuses on global major leading industry players of Actuator market providing information such as company profiles, product picture and specification, capacity, production, price, cost, revenue and contact information.
Connector (enables a direct plug of the actuator to a print circuit board)
Many of the actuators will be supplied on new valves whilst a number are being retrofitted by Rotork Site Services Australia onto existing hand operated valve installations.
The commercialized Nafion[R] (DuPont[TM]) film with a thickness of 180 [micro]m was used as an ionic polymer film for the fabrication of an IPMC actuator.
So, a number of experiments were performed in order to be able to predict the thermo-mechanical behaviour of shape memory alloys, focused on finding the dependence of actuator's stroke and force function of temperature and a method suitable for the improvement of the cooling time, fact which will lead to augment response in real-time of the actuator.
Removing the lever tool ensures the automatic re-engagement of the actuator and valve coupling when the actuator and valve next align--this either occurs automatically or on the next process trip.
With three actuators to choose from, the head features a choice of four head rotation angles and two actuator entry points.
The Dryden team also plans to test an electromechanical actuator, one that eliminates hydraulic fluid altogether.
MISUMI's comprehensive LX Actuator line offers literally thousands of configurations.
M-mac Actuators Inc, North Vancouver, BC, applied these developments to the creation of a self-contained hydraulic actuator that would fill the gap between the limits of force at which a mechanical actuator is practical, to applications where the magnitude of force dictates a conventional hydraulic system.
NASA plans to conduct one more orbiter maintenance and modification project, in 2002 on the shuttle Discovery, before the actuator work begins.