In ***, there is a key indicator to measure the quality of automobile manufacturing called NVH, which is noise, vibration and harshness. NVH is an important part of the automotive development process, which is not only related to the technical performance of the vehicle, but also directly related to the subjective feelings of the driver and passengers.
Noise
Noise mainly comes from the sound of the engine, tires, wind resistance, suspension system and other components working. Engineers study and optimize various noise sources through simulations and experiments to ensure a quiet and comfortable environment in the vehicle. Modern cars are often equipped with advanced soundproofing materials and technologies, such as sound-absorbing cotton, shock-absorbing pads, etc., to reduce noise levels.
Vibration
Vibrations come from the engine, drivetrain, uneven road surfaces, and other mechanical movements. Excessive vibrations can affect the driver's handling and the passenger's comfort. To control vibration, engineers perform dynamic testing, analyze vibration frequency and amplitude, and use shock absorbers, balancing techniques, and other means to mitigate or eliminate vibration.
Harshness
Harshness describes the sensation of noise in a vehicle due to vibrations, such as the impact sound of acceleration, braking, and hurdle crossing. It's the hardest part of NVH to quantify, yet intuitively impacts the user experience. Good harshness design requires the vehicle to be smooth and avoid harsh sound when encountering bumps or power changes.
To sum up, the NVH of a vehicle largely determines the driving experience of a car, and a good NVH design can keep the vehicle at a low noise level under various working conditions, reduce vibration transmission, and provide a smooth and comfortable riding experience. Conversely, poor NVH performance can lead to driver fatigue, passenger discomfort, and potentially reduced brand recognition.