Noise, Vibration,
and Harshness (NVH)

NVH stands for Noise, Vibration, and Harshness — a category of unwanted sensory disturbances in vehicles and mechanical systems. Noise refers to audible sound. Vibration refers to mechanical oscillation the body feels. Harshness refers to the intensity or abruptness of those effects during transient events such as road impacts, engine load changes, or start/stop cycles.

NVH originates from sources like powertrain operation, drivetrain movement, exhaust flow, road and surface interaction, aerodynamic turbulence, and component-to-component contact. Each source generates characteristic frequencies and energy levels, which transmit through structural paths — mounts, bushings, brackets — and airborne paths — cavities, panels — into the cabin or operator position.

NVH is a performance and safety issue as well as a comfort issue. Sustained low-frequency vibration reduces driver alertness and slows reaction time. Excessive vibration accelerates structural fatigue and component wear. Unwanted noise can mask critical audible cues in industrial and defense environments. NVH reduction contributes to durability, operational safety, and perceived quality — not only passenger comfort.

Isolation prevents vibration from transmitting between two structures — a bushing separating a suspension arm from the chassis, for example. Damping absorbs and dissipates vibration energy within a material or component, reducing its amplitude over time. Most NVH systems use both: isolators interrupt the transmission path, dampers reduce the magnitude of what does transmit.

Compound formulation determines stiffness, damping behavior, temperature tolerance, fatigue life, and environmental resistance. A compound that performs at -40°C may behave very differently at 120°C. A compound optimized for damping may not meet the fatigue requirements of a stabilizer bar bushing. NVH components are only as good as the compound behind them, which is why material development is an engineering discipline in its own right.

These in-cabin sounds typically come from component-to-component contact — trim pieces rubbing, fasteners loosening, bushings degrading, or mounting points losing preload. Rubber isolators and bushings are a common mitigation, separating surfaces that would otherwise transmit friction, impact, or micro-movement into the cabin as audible noise.

Vehicle NVH generally spans 0–200 Hz for structure-borne effects and higher ranges for airborne noise. Low-frequency vibration, roughly 1–20 Hz, is where drivers are most physiologically sensitive, which is why it is closely studied in relation to driver fatigue and alertness. NVH components — engine mounts, suspension bushings, exhaust isolators — are tuned to control specific frequency bands relevant to their application.

NVH components are used across automotive, commercial truck, aerospace, defense, industrial equipment, rail, mining, and infrastructure applications. Any system where operators are exposed to vibration, or where component durability depends on controlling oscillation, is a candidate for NVH engineering.

AirBoss manufactures stabilizer bar bushings, mass dampers, hydro bushings, exhaust isolators, shock bushings, and related rubber-based NVH components. Component design, compound development, and validation testing are handled in-house, and custom programs are developed with customers through our North American engineering team.

Yes. Material development runs through the AirBoss Compound Technology Center, an ISO/IEC 17025-accredited custom rubber development lab in Kitchener, Ontario. Compounds are formulated to specific NVH performance targets, operating environments, and fatigue requirements, rather than pulled from a fixed catalog.