Road noise is a vital component of vehicle NVH performance. When a vehicle travels, uneven road surface excitations transmit through tires and suspension to the vehicle body, ultimately generating noise inside the cabin. Road noise occupies a critical position in NVH development, especially amid the prevailing popularity of new energy vehicles (NEVs). Without masking noise from internal combustion engines, road noise optimization has become a core segment of NEV NVH development.

New energy vehicles eliminate the noise from conventional internal combustion engines, making the NVH performance of thermal management systems (including heat pump air conditioners, electronic cooling fans, electronic water pumps, wireless charging modules, PM2.5 purification systems and other components) far more perceptible to vehicle occupants.

Compared with battery electric vehicles, extended-range electric vehicles are equipped with multiple excitation sources such as internal combustion engines, intake systems, exhaust systems and generators. The in-cabin vibration and noise induced by the range extender constitute the most critical NVH risk for such vehicles. For the NVH development and matching of range extenders, besides hardware optimization (range extender assembly, mounts, intake and exhaust systems, etc.), vehicle-level calibration strategies for range extender NVH also play a vital role.

The development and tuning of acoustic packages represent a core segment of vehicle NVH performance engineering. Improvements to wind noise, road noise, powertrain noise, electromechanical noise and other noise categories all rely heavily on acoustic package optimization. The development and tuning of acoustic packages aim to isolate or absorb radiated noise via material selection and structural design, optimize vehicle noise transmission paths, and enhance overall cabin quietness.

Wind noise is generated by the interaction between airflow and vehicle body structure during driving. Generally, when the vehicle speed exceeds 80 kph, wind noise becomes the dominant noise source inside the cabin. The development and tuning of automotive wind noise constitute a vital part of full-vehicle NVH performance engineering, requiring cross-disciplinary collaboration among aerodynamics, acoustics, material science and other fields. The core goal is to reduce perceived wind noise and improve riding experience through optimized design of body structure, vehicle sealing systems and acoustic packages.

The mounting system connects the powertrain to the vehicle body and serves as the primary structural-borne noise transmission path for powertrain NVH. Its core functions are as follows: Support the powertrain: The mounting system must bear the weight of the powertrain and prevent excessive static displacement. Restrict powertrain displacement: When the powertrain is subjected to various disturbance forces (braking, acceleration, deceleration, etc.), the mounting system can effectively limit its maximum travel to avoid collision and interference with adjacent components. Vibration isolation: The powertrain mount system shall attenuate and isolate vibrations transmitted from the powertrain to the vehicle frame as much as possible. Meanwhile, it also suppresses vibrations transferred from the frame to the powertrain caused by uneven road surfaces.

The intake system is generally divided into the engine intake manifold assembly and air filter intake system. The exhaust system refers to the complete set of components extending from the engine exhaust manifold all the way to the exhaust tailpipe. Intake & Exhaust NVH is a noise and vibration control technology dedicated to engine intake components (air filter, intake manifold) and exhaust components (muffler, exhaust pipe). Its core objectives include suppressing airflow pulsation noise, combustion-excited vibration and structural radiated noise, as well as striking a balance between acoustic performance and powertrain performance metrics such as intake efficiency and exhaust backpressure regulation.

The transmission system transfers power from the engine to the drive wheels to ensure normal vehicle operation under various driving conditions. Transmission NVH refers to vibration and noise control technology targeting transmission components such as gearboxes, drive axles and drive shafts. Its core goal is to suppress gear meshing noise, bearing vibration and driveline resonance while transmitting power, so as to improve vehicle ride comfort and reliability. As a key performance indicator of the powertrain, transmission NVH directly affects driving smoothness and premium driving perception. Transmission systems of new energy vehicles face greater challenges: the high torque characteristics of electric drives aggravate gear impact, and the quiet operation of motors makes transmission noise much more noticeable.