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Electronic stability control (ESC), also referred to as electronic stability program (ESP) or dynamic stability control (DSC), is a computerized technology [1] [2] that improves a vehicle's stability by detecting and reducing loss of traction . [3]
The period is usually on the order of 3–15 seconds, but it can vary from a few seconds for light aircraft to a minute or more for airliners. Damping is increased by large directional stability and small dihedral and decreased by small directional stability and large dihedral.
A control system includes control surfaces which, when deflected, generate a moment (or couple from ailerons) about the cg which rotates the aircraft in pitch, roll, and yaw. For example, a pitching moment comes from a force applied at a distance forward or aft of the cg, causing the aircraft to pitch up or down.
Flight dynamics is the science of air-vehicle orientation and control in three dimensions. The critical flight dynamics parameters are the angles of rotation with respect to the three aircraft's principal axes about its center of gravity, known as roll, pitch and yaw.
The Accord also won Car and Driver's 10Best trophy in 2008 and 2009, a total of 23 times in the nameplate's history, winning it more times than any other vehicle by far. US sales have been up 9.4%, as SUV buyers shift to the V6 Accord. [50] The 2008 - 2011 Honda Accord was awarded a best-in-class rating of 4 1/2 stars by the JB car pages. [51]
The way in which particular vehicle factors affect flying qualities has been studied in aircraft for decades, [3] and reference standards for the flying qualities of both fixed-wing aircraft [4] and rotary-wing aircraft [5] have been developed and are now in common use. These standards define a subset of the dynamics and control design space ...
Stability derivatives, and also control derivatives, are measures of how particular forces and moments on an aircraft change as other parameters related to stability change (parameters such as airspeed, altitude, angle of attack, etc.). For a defined "trim" flight condition, changes and oscillations occur in these parameters.
[2] [1] Equally, the system is commonly disengaged prior to landing, as it could inhibit the control authority to the pilot at the critical moment of touchdown. On several modern aircraft that are outfitted with a yaw damper, these systems become engaged automatically once the aircraft has surpassed a set altitude (e.g. 200 feet); older ...