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.
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What is NVH?
To enhance vehicle performance, comfort, and brand recognition, we offer a wide range of flexible and flexible solutions for capturing and analyzing NVH data in the field of noise, vibration, and harshness (NVH), all compliant with 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 the 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
- Whole-body vibration
- 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
- Combustion Noise
Octave Band Analysis and Analyzer
Octave band analysis is an indispensable tool for sound measurement because it gives a close approximation of how the human ear responds. Dewesoft octave band analyzer meets all of the IEC and ANSI specifications for octave filters.
Sound Power Measurement Solution
Dewesoft sound power measurement solution merges the best of both worlds: widely established sound power measurements with familiar, distinctive user interface and industry unmatched adaptability. Rate and compare different noise sources with ease and exactness while simultaneously monitor any number of additional parameters.
Reverberation Time RT60 Measurement
When room acoustics properties are at issue, the RT60 reverberation time solution represents an essential tool for obtaining an accurate measurement of reflected sound. The easy setup enables reliable measurement for effective modification of room parameters and easy achievement of desired reverberation time.
for Rotating Machinery
Order analysis is a technique for analyzing noise and vibration signals in rotating or reciprocating machinery such as engines, compressors, turbines, and pumps. Dewesoft provides flexible order analysis software and data acquisition hardware for analyzing any rotating machinery. The solution is extremely powerful in combination with other modules like torsional vibration analysis, combustion analysis, or power analysis. It can provide complete diagnostics of generators, combustion engines, and rotating shafts.
Class 1 Sound Level Meter
FOR SOUND and Noise Measurement
The golden standard for sound noise level meter reimagined with the Dewesoft approach. Easy to set up and use while ensuring maximum accuracy with certified compliance with international standards. No matter the type of acoustics measurement, a sound level meter is always at the heart of the sound analysis.
Sound Intensity Measurement
A perfect tool for sound intensity level measurement and noise source determination brought to an entirely new level by Dewesoft. The solution brings a simple and intuitive measurement process while offering the utmost precision and industry unmatched adaptability.
Sound Quality Measurement and Analysis
A sound quality measurement is an indispensable tool for successful sound engineering. It addresses the need to empirically evaluate how sound produced by different kinds of machines are perceived by the human ear. The tool will help you determine how the sound is perceived, tune the sound of your machine and make it appealing to the user, and finally, maximize your market potential.
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