Vehicle NVH Testing - Noise, Vibration, and Harshness
Noise, vibration, and harshness (NVH), also known as noise and vibration, is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. Our complete NVH testing and NVH analysis solutions are ideal for optimizing noise and vibration of the vehicles, such as reduction, design, and quality assurance of the interior and exterior noise.
To enhance vehicle performance, comfort, and brand recognition we offer a wide range of flexible and flexible data acquisition and analysis NVH testing solutions in the field of noise, vibration, and harshness (NVH) - all performing according to the international standards and supported by calibration services.
What is Noise?
Noise is unwanted sound or unwanted disturbance in an electronic signal. Acoustic noise is energy transmitted to the air that causes an audible disturbance. Tools such as acoustic intensity mapping and combustion/mechanical noise separation can be used to identify the best method of noise reduction.
What is Vibration?
Vibration is an oscillation that causes noise and disturbance. Vibration is generally of concern due to the physical effects which can cause disturbance to people, disruption in electrical systems, and failure or breakdown in mechanical systems. Shakers and controllers are techniques used to test vibration issues.
What is Harshness?
Harshness is generally used to describe the severity and discomfort associated with both vibration and noise. It is a qualitative system based on desired characteristics rather than on quantifiable measurements.
NVH testing is widely used in the automotive industry for the reduction, design, and quality assurance of interior and exterior vehicle noise or vibration. The process usually takes place during vehicle development of passenger cars.
NVH can be tonal such as engine noise, or broadband, such as road noise or wind noise. Basically it is everything that drivers or passengers can either hear and feel from a car while driving, such as wind noise, road noise, bumps from the suspension, or vibrations from the engine.
Noise, vibration, and harshness (NVH) testing involve subjecting a full vehicle, component or subassembly to vibrations at different frequencies, as a means of determining mode shapes and isolating buzzes, squeaks, and rattles. Typical instrumentation used to measure NVH include microphones, accelerometers and force gauges, or load cells. Component and subassembly NVH tests are most commonly performed using a vibration shaker while entire vehicles usually on the test track or road simulator testbeds.
Many NVH facilities will have semi-anechoic chambers and rolling road dynamometers. Typically, signals are recorded by a DAQ system directly to a hard disk via sensors and an ADC converter (analog-to-digital converter) and a suitable signal conditioner.
Improving NVH can be achieved by reducing the source strength, by interrupting the noise or vibration path, or by absorption of the noise or vibration energy. Techniques used to help identify NVH include part substitution, modal analysis, rig squeak and rattle tests (complete vehicle or component/system tests), lead cladding, acoustic intensity, transfer path analysis, and partial coherence.
Dewesoft helps develop, design, or troubleshoot NVH issues:
Sound packaging: dash/floor silencer, headliner, door trims, etc.
Pass-by noise test
Powertrain NVH: engine and transmission NVH testing
Interior noise: squeak and rattle, road noise
Sound design and sound quality
Component noise: component induced NVH
Brake noise and Brake squeal
Tire acoustics: tire and road sound
Intake and exhaust noise
Sound pressure level: stationary road vehicles
Source Path Contribution - SPC
Powertrain Structural Optimization - Finite Element Calculation