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Tracker action in Jørlunde church.Organ by Frobenius (2009). Tracker action is a term used in reference to pipe organs and steam calliopes to indicate a mechanical linkage between keys or pedals pressed by the organist and the valve that allows air to flow into pipe(s) of the corresponding note. [1]
A typical ETC system consists of three major components: (i) an accelerator pedal module (ideally with two or more independent sensors), (ii) a throttle valve that can be opened and closed by an electric motor (sometimes referred to as an electric or electronic throttle body (ETB)), and (iii) a powertrain or engine control module (PCM or ECM). [4]
The electro-pneumatic action is a control system by the mean of air pressure for pipe organs, whereby air pressure, controlled by an electric current and operated by the keys of an organ console, opens and closes valves within wind chests, allowing the pipes to speak. This system also allows the console to be physically detached from the organ ...
In manual transmission cars, the dead pedal is designed to promote a smoother actuation of the clutch by keeping the driver's foot in the same plane as the pedal. [1] Automatic transmission cars can also benefit from the dead pedal because it prevents fatigue by offering a stable inclined surface on which the driver can place their foot. Even ...
A centrally located and electrically-powered compressor powers cylinders, air motors, pneumatic actuators, and other pneumatic devices. A pneumatic system controlled through manual or automatic solenoid valves is selected when it provides a lower cost, more flexible, or safer alternative to electric motors , and hydraulic actuators .
The first use of pedals on a pipe organ grew out of the need to hold bass drone notes, to support the polyphonic musical styles that predominated in the Renaissance. Indeed, the term pedal point, which refers to a prolonged bass tone under changing upper harmonies, derives from the use of the organ pedalboard to hold sustained bass notes. [2]
DOD Electronics, or simply DOD, also known as their brand name DigiTech, is an American manufacturing company that makes guitar effects pedals, as well as active crossover gear. DOD is owned by Cortek, the parent company of Cort Guitars. Their DigiTech Whammy pedal has been called "one of the most significant innovations in pedal tech". [1]
Also, since the brake pipe is typically used for control and supply of air to the cars, if an engineer is not careful, the air supply can be depleted. Further, since the engineer is only aware of the brake pipe pressure and flow of air into the brake pipe, it is not easy to know the state of the train brakes at any given time.
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