Vehicle NVH

Proving Ground / On Road Testing

Measuring a car in its natural habitat, on the road, is often the best and sometimes the only way to experience it's true NVH behaviour. 
We can assist with the following types of track based tests:-

  • Competitor Benchmarking / Target Setting
  • Subjective Assessment & Objective Measurement
  • Tyre / Road Noise 
  • Wind Noise
  • Pass-by Noise 
  • Transfer Path Analysis

2WD / 4WD Dyno Testing 

Operating a vehicle under controlled conditions on a chassis dynamometer in a Vehicle Semi-anechoic Chamber (VSAC) can often be the best way to replicate Powertrain NVH related issues quickly and repeatably. Our high capacity eddy current hub dynamometers can be used for the following vehicle NVH tests:-

  • Powertrain NVH Issue Replication
  • Problem Solving
  • Transfer Path Analysis - Forcing Data
  • Hybrid Powertrain IC/EV Mode Comparisons

NVH Laboratory Tests

In conjunction with road and dynamometer based tests, we  also perform static laboratory NVH testing, to establish the modal behaviour of structures, or to understand the paths of noise and vibration through a vehicle structure

  • Modal Analysis
  • Acoustic Transfer Functions (ATF)
  • Noise and Vibration Transfer Functions (NTF / VTF)
  • Point Mobility / Dynamic Stiffness
  • Transfer Path Analysis - Transfer Functions

Operational Sound Quality

Operational Sounds such as a door opening, or a seat motor are often part of the first impression a potential customer is exposed to, and are important part of vehicle design.

A semi-anechoic chamber provides the perfect conditions to measure these types of sounds. Using binaural recording systems, and an array of acoustic metrics, we can assess the following types of operational noise

  • Door/ Bonnet/ Trunk Open/Shut 
  • Window Open/Shut
  • Seat / Wheel Adjustment
  • Brake Pedal Clonk
  • Audible Warning Sounds

Vehicle Transfer Path Analysis

Often the first step to solving a noise and vibration problem is to identify which noise source or sources is/are causing the problem. Sometimes this can be done intuitively, but in many cases it is not immediately obvious which source or sources are the most significant, or by which path a known noise source is travelling through the vehicle structure. 

Transfer Path Analysis is a great technique for comparing the relative contributions of a number of noise sources, so that the most significant source or path can be identified. 

AVA Consulting  use classical and operational transfer path analysis methods, to obtain full vehicle or sub-system results

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