ground loop

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ground loop

[′grau̇nd ‚lüp]
(aerospace engineering)
A sharp, uncontrollable turn made by an aircraft on the ground during landing, taking off, or taxiing.
(communications)
Return currents or magnetic fields from relatively high-powered circuits or components which generate unwanted noisy signals in the common return of relatively low-level signal circuits.
(electricity)
Potentially detrimental loop formed when two or more points in an electric system that are nominally at ground potential are connected by a conducting path.

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Simplex burner.
i. An uncontrolled turn on the ground either on takeoff or, more often, on landing in a tail-wheel aircraft. Also called a ground loop
ii. To turn a propeller by hand to start the engine.
iii. To calibrate compass deviation by recording its values at predetermined intervals and correcting the deviation to the extent possible.
iv. The sudden yaw of a multiengine airplane when one of the engines, especially the one away from the centerline, fails.
v. In aerial photography, it is the angle measured in the plane of the photograph from the positive y-axis clock-wise to the nadir point.

ground loop

A circular path created between the data lines and the ground wires when electronic devices communicate with each other. When systems have earth grounds through different power sources, differences in reference voltages can cause problems for various reasons (see inter-system ground noise). See ground.


The Ground Loop
The ground loop is created because all the equipment is wired to earth ground.
References in periodicals archive ?
Ground-loop Heat Exchanger Model: This component model is a modified version of that developed by Yavuzturk and Spitler (1999), which is a response factor (referred to as g-functions) model based on the work of Eskilson (1987).
Ground-Loop Sizing, Base Case Simulations, and Parametric Runs.
With additional input parameters which would be readily available to designers, the area of a supplemental solar collector array in a heating-dominated building can be calculated, along with the reduced ground-loop heat exchanger length.
This definition was chosen for practical reasons, because when significant ground-loop reduction occurs in these types of hybrid systems, the designer must choose a cooling tower to ensure that the peak building load will be met by the hybrid GHP system.
A better connection scheme for single-ended inputs that reduces ground-loop errors is shown in Figure 4.
Combinations of copper and fiber ports are increasingly popular in industrial LANs where fiber is chosen for noise immunity, distance, and ground-loop avoidance.
Thomas Emlinger states, "The Auto-HummBuster technology is extremely effective, eliminating unwanted ground-loop noise in almost every case.
According to Roemtech, ground-loop noise is a common audio problem, especially in classroom audio systems.
Primarily suited for DC-DC converters, typical applications include ground-loop isolation, signal-noise isolation, communications (adapters, chargers), consumer applications like appliances and set-top boxes, and industrial applications such as power supplies, motor control, and programmable logic control.
Each unit features lightweight, robust, hermetically-sealed titanium housing, an insulated base (avoiding ground-loop problems) and a 10 32 UNF thread mounting hole - suiting use in harsh environmental conditions.
Pump power relationships as a function of water or glycol flow rates were developed based on matching manufacturer's performance curves for brushless permanent-magnet (BPM) pumps against manufacturer's system head curves for a reference vertical-bore ground-loop design of 200 ft (61 m) bore depth.