Definition of a linear actuator An actuator is a type of transducer, a device that is capable of converting one form of energy into another. The energy may come from an electric current, hydraulic or pneumatic pressure or, indeed, chemical energy produced by metabolism in living organisms.
A motor is an example of an actuator that transforms energy from electricity or fuel into the energy of circular motion. A linear actuator, on the other hand, converts energy of rotary motion into linear motion. Piezoelectric actuators are an example of one type of linear actuator. These devices may be very small, as micro and mini actuators, or very large, as in the case of heavy duty actuators.
Linear actuators on airplane flaps
Airplane flaps are structures that are mounted by hinges onto the trailing edge of the wings of a fixed-wing aircraft. Their function is threefold:
- reduce stall speed
- increase the angle of descent
- reduce the pitch angle of the aircraft. During landing, this improves the pilot's view of the runway over the nose of the aircraft.
Linear actuators in reverse thrust
Immediately after touchdown, reverse thrust is used to provide the necessary deceleration of the aircraft. Here, the force provided by the airplane's exhaust is directed forward, against the direction of travel. Propeller-driven air craft may also be able to use linear actuators to produce reverse thrust in flight. This allows rapid deceleration, quick speed changes the buildup of speed encountered in steep dives.
Mini actuators and model planes
Mini actuators and even micro actuators are used in remote control model aircraft. For very small models (less than 10 grams auw) actuators are the only viable solution due to their compact size, low power draw and reduced weight as compared to other solutions. Mini actuators are ideal for aileron control and steering applications on remote controlled planes.
All of the above principals are illustrated in this video, showing the bed of a toy container truck being raised and lowered using a linear actuator.
Using a linear actuator can provide optimum performance that is both reliable and durable. Contemporary linear actuators employ a highly leveraged ball nut and screw, and offer more than 90 percent efficiency. Compare this to the classic Acme threaded screw design, which typically offered efficiency between 20 and 70 percent. This strength, relatively small size for force exerted, and flexibility in terms of power and control make linear actuators a strong contributor to aeronautic control systems.Written by Actuator Store
I got a behind the scenes tour of that place2010-02-24 17:14:50 by bent_rider
Back in the 80's.
got to see the control system, control room, etc.
Also got a behind the scenes tour of the 'Star Wars' ride.
The theater you sit in is a jumbo jet flight simulator up on these enormous hydraulic actuators that make the theater move around.
Was way more interesting than the actual ride.
Whats your problem?2009-04-03 11:41:11 by HiredHelp
You seem to take an abnormal amount of pleasure in telling other folks what they are and are not. I didnt ask for advice from you, I asked for job leads from the board.
In between the time I last posted and this post, I was offered a position as a supervisor, in a high tech petroleum company, making hydraulic manifolds for actuators that control the flow of petroleum through the lines. Not bad for a worthless guy, huh?
Just goes to show that not even you, The Almighty, knows everything. And as for the union comment, the only way I ever knew I was in a union was from the dues being deducted from my check
Keltron receives order worth Rs 2.44 crore — The New Indian Express
The pneumatic actuators will be manufactured at the Keltron Controls division of Keltron at Aroor in Alappuzha district.
Semiconductor Processing Improves with FPGA-based Controller — Automation World
The machine includes a rotary mechanism with pneumatic actuators to handle freshly diced wafers, which are identified by a gigabit Ethernet camera to position the stage to pick components of the freshly cut silicon with actuators.
Frigidaire 241676101 ACTUATOR-SOLENOID
Single Detail Page Misc (Electrolux)