Electric vehicle refers to the vehicle that is powered by battery, converts power, driven by an engine and complies with the requirements of road safety regulations. Electric vehicles are now considered the alternative to conventional vehicles. Electric cars are commonly known not only for being environmentally friendly, but also for being very quiet. While a quiet car is generally a good thing, safety concerns have been raised that electric vehicles (EVs) may cause more frequent accidents involving pedestrians than internal combustion engine (ICE) cars, as Pedestrians may not notice an approaching EV. Specific standards are set by regulatory authorities for the noise emission of electric vehicles. This document describes several aspects of noise related to electric vehicles. Furthermore, several methods and experiments conducted by researchers for a better understanding of electric vehicle noise. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay In the 21st century, electric vehicles have seen a resurgence thanks to technological developments and an increased focus on renewable energy. Government incentives have been introduced to increase adoptions, including in the United States and the European Union. Nowadays, the trend towards more electric cars is evident. But electric vehicles (EVs) or hybrid electric vehicles (HEVs) bring new challenges in terms of noise, vibration and harshness (NVH), such as: high-frequency electric motor generator noise, high-frequency switching noise of the power control, power split system gear noise and engine noise start/stop noise and vibration. The intensity of the noise produced by some of these components depends on the speed of the car, the electrical components used and the body structure of the vehicles. In addition to this, when the speed of the electric car is low, tire/road noise, wind and other noises from electric vehicles are not enough to signal the presence of the car to road users, including pedestrians, cyclists or people with vision problems. Electric vehicle noise regulations have been established by most countries for the safety of road users. Some consideration is then given to the methods by which interior noise targets can be set for hybrids and electric vehicles and how they are applied to components around the vehicle, before focusing on some specific issues that arise in quiet vehicles with engines high power traction. Classification of Noise generation from electric vehicles: Existing noises that become audible on hybrids: gear whines, electric machine noise, and drivetrain rumbles resulting from a new degree of freedom in the drivetrain. The noises generated in electric vehicles can be classified into two types: (1) internal noise, (2) external noise. Internal noise consists of high-frequency noise of electric motors, high-frequency switching noise of the power control unit, gears of the power distribution system noise, and noise due to starting and stopping the motor. This poses new NVH challenges such as road noise and powertrain noise as they become more apparent. In the internal combustion engine, the starting event can be described in two clearly distinct phases: (A) the initial application of torque by the starting machine and (B) the firing of the engine as it accelerates. Electric motors.