Search results
Results From The WOW.Com Content Network
These will absorb a part of the vibrations (and the noise) produced by the machines. To control the electromagnetic vibrations at the origin, skewing the electric motor or choosing a better slot/pole combination [3] will reduce electromagnetic force harmonics or avoid resonances between magnetic forces and structural modes of the electric motor.
The vibration will result in structure borne noise, as well as unwanted acceleration forces or resonance, which eventually will harm or damage parts of the electric motor. To reduce the unbalance forces, precision balancing , as described in the American military standard MIL-STD-167-1A, [ 20 ] type I (internally exited) will be necessary.
Most such systems generate electricity, which in turn drives an electric motor for propulsion or recharges the boat's batteries. The submarine's electrical system is also used for providing "hotel services"—ventilation, lighting, heating etc.—although this consumes a small amount of power compared to that required for propulsion.
Large commercial ships are the dominant human-generated contributors to low-frequency noise across ocean basins, which wildlife rely on for survival. Put your cruise on silent mode, please: Why ...
Turbo-electric transmission uses electric generators to convert the mechanical energy of a turbine (steam or gas) into electric energy and electric motors to convert it back into mechanical energy to power the driveshafts. An advantage of turbo-electric transmission is that it allows the combination of high-speed turbines with slow turning ...
The rim-driven thruster, also known as rim-driven propulsor/propeller (or RDP) is a novel type of electric propulsion unit for ships. The concept was proposed by Kort around 1940, but only became commercially practical in the early 21st century due to advances in DC motor controller technology. [ 1 ]
Ships docked at ports usually keep their engines running to stay operational for passengers and crew. Shore power allows ships to shut off their engines and plug into a giant electric outlet while ...
At 1:25 a.m. on March 26, when the Dali was a little over half a mile away from the bridge, electrical breakers that fed most of the ship’s equipment and lighting unexpectedly tripped, causing a ...