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Introduction of Electrical Drives
Published in Vinod Kumar, Ranjan Kumar Behera, Dheeraj Joshi, Ramesh Bansal, Power Electronics, Drives, and Advanced Applications, 2020
Vinod Kumar, Ranjan Kumar Behera, Dheeraj Joshi, Ramesh Bansal
Low-power drives are fed from single-phase sources. Most of the industrial drives use three-phase sources. For electric traction 25 kV, a single-phase supply is used. Most of the commercial drives are fed directly from a 50-Hz source. In aircraft, a high power-to-weight ratio is an important requirement. In aircraft, a 400-Hz AC supply is generated and supplied to motors to achieve a high power-to-weight ratio. Some drives, such as lift tractions, are fed from a battery. For energy conservation, solar-power drives are used in space and water-pumping operations.
Vehicle structure and aerodynamics
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
The advantages associated with this new form of aluminium alloy integral body construction may therefore be summarized as follows: It contributes to an overall reduction in the weight of the car, because the engine can be smaller and lighter, the suspension mechanism can be lighter and the fuel tank can be smaller as less fuel is needed to propel a lighter car.The improved power-to-weight ratio of the car allows a better performance for less power output, so that fuel economy and emissions reduction will both benefit.From consideration of 1 and 2 the car will handle better on the road and will also accelerate faster in response to traffic conditions for safer driving.The structural stability of the body helps to reduce vibrations and improves noise control.From consideration of 4 the body also confers better energy absorption thereby enhancing passive safety for the occupants.The greater use of aluminium alloy can be of benefit to the environment, because it has recognized potential in recycling.
Optimum heat treatment of aluminum alloy used in manufacturing of automotive piston components
Published in Materials and Manufacturing Processes, 2018
Maaz Akhtar, Sayyad Zahid Qamar, Muzamil Muhammad, Ali Nadeem
Nowadays, automotive industry is focusing more on designs that consume less fuel and are reliable in extreme environments. One way to get improved fuel efficiency is to target higher power-to-weight ratio of engine components. This requires good engineering design (including proper material selection) and improved manufacturing processes [1–3]. Manufacturing of automotive parts typically involves casting, machining, and heat treatment. Casting also requires pattern making and mold preparation. Fettling is sometimes needed to remove mold marks from cast parts. Turning, facing, and other finishing operations are generally needed to get the final shape, and the requisite surface finish and dimensional accuracy. Heat treatment is then carried out for desired combination of strength, hardness, and toughness. Some automotive parts are also produced by extrusion, rolling, and other methods. Vacuum-assisted die casting is used to manufacture high accuracy parts [4].
Evaluation of in-pipe turbine performance for turbo solenoid valve system
Published in Engineering Applications of Computational Fluid Mechanics, 2018
One of the most important performance criteria for turbines is the power to weight ratio. Using the Buckingham π theorem, the non-dimensional power to weight ratio can be obtained as shown in equation 18. Power to weight ratio is the ratio of the power obtained in its expression to the power present in the flow. This equation is like efficiency, therefore, it usually takes a value between 0 and 1.