What does automotive NVH mean?
1 Answers
NVH stands for Noise, Vibration, and Harshness. Here is some relevant information: 1. NVH issues are ubiquitous and can be categorized into three main areas based on their sources: engine NVH, body NVH, and chassis NVH. Further subdivisions include aerodynamic NVH, air conditioning system NVH, road driving NVH, braking system NVH, etc. 2. Harshness, also known as unevenness or impact characteristics, is related to the transient nature of vibration and noise. It describes the subjective human perception of vibration and noise and cannot be directly measured by objective methods. The comfort experienced by vehicle occupants and the strength and lifespan issues of automotive components caused by vibration all fall within the scope of NVH research. From an NVH perspective, a car is a system composed of excitation sources (engine, transmission, etc.), vibration transmitters (consisting of suspension systems and connectors), and noise emitters (vehicle body). 3. NVH issues are systemic. For example, if a car's cabin noise is excessive while driving and the source is traced to the engine, this noise issue may involve three parts: the engine itself being noisy, poor vibration damping by the engine mounting components, and inadequate sound insulation technology in the cabin's front wall and floor. This illustrates how NVH problems are interrelated systemic issues.
