NVH

NVH stands for Noise, Vibration, and Harshness, which serves as a core comprehensive benchmark for evaluating overall vehicle build quality, premium feel, and ride comfort. It not only directly shapes the driver's first impressions of a vehicle's refinement, but also comprehensively tests a carmaker's engineering prowess in acoustic design, mechanical dynamic balancing, aerodynamic optimisation, and vehicle lightweight damping calibration.

Core Technical Architecture and System Control

Optimising a vehicle's NVH performance is a systematic engineering discipline encompassing the entire physical architecture of the car. Its technical framework primarily consists of noise source suppression, vibration transmission path isolation, and bodyshell acoustic package absorption:

Powertrain Source and Structural Dynamic Balance Optimisation: 

The primary sources of noise and vibration stem from internal combustion engine firing, high-frequency electric motor electromagnetic whine, transmission gear meshing, and road surface excitation. By optimising engine crankshaft mass balancing, utilising high-precision helical gears, designing dedicated rotor skewing/eccentric pole structures for EV electric drive units (EDUs), and optimising inverter PWM modulation frequencies, abnormal high-frequency noise and mechanical vibrations are minimised right at their physical source. 

Multi-Path Vibration Isolation and Advanced Acoustic Package Damping: 

For vibrations and noise inevitably transmitted toward the cabin, automotive engineering adopts a multi-stage vibration isolation strategy. This includes deploying hydraulic engine/motor mounts, flexible high-rigidity subframe bushings, extensive damping and sound-deadening sheets throughout the chassis, acoustic laminated glass (double/triple-glazed acoustic windows), and filling body cavities with expanding foam and acoustic absorption felt to construct a robust acoustic barrier. 

Safety Guidelines and Physical Limitations

Prohibiting Continued Driving with Severely Aged Chassis Suspension Bushings or Collapsed Engine/Motor Mounts to Cut Costs:

Rubber bushings and mounting components serve as critical flexible isolators that block NVH transmission. Abnormal undercarriage booming noises and severe vibrations must never be ignored; aged elastomeric parts not only cause cabin NVH levels to deteriorate severely—resulting in excessive noise and resonance—but also compromise the chassis's physical damping capability. This poses grave safety risks, including compromised suspension geometry and handling precision, or even the dislodging of drivetrain components during driving. 

Prohibiting Compromising Factory Passive Safety and Wiring Harness Insulation During Aftermarket Soundproofing Modifications:

Blindly pursuing extreme cabin quietness through substandard, intrusive full-car soundproofing carries significant risks. Never use sub-par, flammable industrial bitumen/asphalt sheets, obstruct side airbag or curtain airbag deployment paths, or damage factory wiring harnesses. Doing so not only emits toxic fumes into the cabin, but could also prevent airbags from deploying properly in a side collision or trigger electrical short circuits and vehicle fires.