Actuation Of Rotating Mechanical Cage
Actuation may refer to: *High Redundancy Actuation (HRA), a new approach to fault tolerant control in the area of mechanical actuation *Variable valve actuation, any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine *Actuation, a type of self-realization referred to in Aristotle's philosophy of entelechy. See also * Actuator An actuator is a component of a machine that is responsible for moving and controlling a mechanism or system, for example by opening a valve. In simple terms, it is a "mover". An actuator requires a control device (controlled by control signal) a ...

High Redundancy Actuation
High-redundancy actuation (HRA) is a new approach to fault-tolerant control in the area of mechanical actuation. Overview The basic idea is to use a lot of small actuation elements, so that a fault of one element has only a minor effect on the overall system. This way, a High Redundancy Actuator can remain functional even after several elements are at fault. This property is also called graceful degradation. Fault-tolerant operation in the presence of actuator faults requires some form of redundancy. Actuators are essential, because they are used to keep the system stable and to bring it into the desired state. Both requires a certain amount of power or force to be applied to the system. No control approach can work unless the actuators produce this necessary force. So the common solution is to err on the side of safety by over-actuation: much more control action than strictly necessary is built into the system. For critical systems, the normal approach involves straightforward ...
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Variable Valve Actuation
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems. Two-stroke engines use a power valve system to get similar results to VVT. Background theory The valves within an internal combustion engine are used to control the flow of the intake and exhaust gases into and out of the combustion chamber. The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are ne ...
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Entelechy
In philosophy, potentiality and actuality are a pair of closely connected principles which Aristotle used to analyze Motion (physics), motion, Four causes, causality, Aristotelian ethics, ethics, and physiology in his ''Aristotelian physics, Physics'', ''Metaphysics (Aristotle), Metaphysics'', ''Nicomachean Ethics'', and ''De Anima''. The concept of potentiality, in this context, generally refers to any "possibility" that a thing can be said to have. Aristotle did not consider all possibilities the same, and emphasized the importance of those that become real of their own accord when conditions are right and nothing stops them. Actuality, in contrast to potentiality, is the motion, change or activity that represents an exercise or fulfillment of a possibility, when a possibility becomes real in the fullest sense. These concepts, in modified forms, remained very important into the Middle Ages, influencing the development of medieval theology in several ways. In modern times the ...
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