What is active load alleviation?
In the active loads alleviation method, additional functions are assigned to available control surfaces to redistribute lift during maneuvers and compensate lift increments during gust encounters to mitigate the structural loads 2,3, 4 .
What is load alleviation function a320?
The LAF (Load Alleviation Function) Unloads the stresses on the wing by momentarily deploying the Flight spoilers(Spoiler No. 4 and 5) and deflects BOTH Ailerons upward. This function is so fast that it is hardly noticeable.
What is gust load Alleviation?
Gust load alleviation (GLA) design is used to improve passenger comfort and reduce the dynamic load at given position. This technique involves closely coupled interactions of unsteady aerodynamics, dynamic qualities of flexible structures, and control action [1.
What is active load control in aviation?
Two of such active aeroelastic load control techniques are Maneuver Load Control (MLC) and Gust Load Alleviation (GLA), which reduce loads in maneuvering flight and in flight through turbulence, respectively. In aircraft design, many disciplines may interact with each other.
What is load alleviation function?
In alternate law, a Load Alleviation Function (LAF) is available on some A320s and relieves wing structural loads in turbulent conditions. When activated, the ailerons and spoilers 4 and 5 on each wing are deflected symmetrically upward. Pilot control authority is not changed when this function is active.
What are high lift devices in aircraft?
High lift devices are movable surfaces or, in some cases, stationary components that are designed to increase lift during some phases or conditions of flight.
What is a VN diagram?
A chart of velocity versus load factor (or V-n diagram) is another way of showing limits of aircraft performance. It shows how much load factor can be safely achieved at different airspeeds. At higher temperatures, air is less dense and planes must fly faster to generate the same amount of lift.
Do flaps increase coefficient of lift?
Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps are used to reduce the take-off distance and the landing distance. Extending the wing flaps increases the camber or curvature of the wing, raising the maximum lift coefficient or the upper limit to the lift a wing can generate.
What plane has the most lift?
Antonov An-225 Mriya
Well the Antonov An-225 Mriya is the biggest of them all. It holds the world record for the largest single-item payload, 418,834 pounds, as well as the record for total airlifted payload—559,577 pounds, or 280 tons.
Why is the flight envelope important?
Flight envelope is important because it reveals the quantifiable limitations of an airplane. All airplanes have limitations. When pushed beyond its limitations, an airplane may fail. Exceeding the airplane’s altitude limit, for example, may cause it to stall.
What does gust envelope mean?
A basic aircraft design envelope that indicates the safe operating limits of an aircraft of given weight in gusty conditions. The air speed is on the X-axis of the envelope, and the load factor is on Y-axis.
What is the alternate law of load alleviation?
Alternate Law – Load Alleviation Function. In alternate law, a Load Alleviation Function (LAF) is available on some A320s and relieves wing structural loads in turbulent conditions. The ELACs and SECs monitor the airplane’s load factor and pilot-demanded load factor to determine LAF activation.
How are gust load alleviation systems used in airplanes?
Gust alleviation systems based on accelerometers mounted in the airplane can reduce the maximum gust loads by a small fraction. These systems still represent an economic advantage. The ability to reduce the gust load increases tremendously if the turbulent gust can be measured before the airplane encounters it.
Which is an advantage of active load alleviation?
Second, active load alleviation can tilt the balance of the transonic aerostructural trade in favor of high-span, low-sweep laminar flow wings. Without load alleviation, a low-sweep NLF wing oers little real advantage over its turbulent counterpart at high transonic speeds.
Why do we need maneuver load alleviation ( MLA )?
Furthermore, the decreased structural strength may lead to structural yielding or failure during maneuvering flight. Consequently, methods to alleviate the maneuver loads on aircraft, which is generally referred to as maneuver load alleviation (MLA), become necessary.