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Vehicle Development

NVH

 
“The sound of silence”
 
By relying on teams of highly skilled technicians, CSI laboratories are able to support each and every stage of vehicle development in the field of Noise & Vibration Harshness (NVH).

NVH-related activities are carried out both in ad hoc laboratories and outdoors, on CSI tracks paved with special materials.
 

 

Noise Analysis

 
CSI has a proving ground featuring a pass-by noise testing track, paved with asphalt conforming to standard ISO 10844.

Main test types:
  • Engine coast down (ECE R117)
  • Production checks
  • Exterior noise evaluation

CSI also has a roller test bench in a semi-anechoic chamber with controlled ambient temperature. The chamber makes it possible to evaluate engine noise levels on a complete vehicle. The control system makes it possible to simulate a variety of driving conditions (acceleration, cruise speed, coast down).

Main types of test:
  • Interior and exterior noise measurements
  • Engine intake and exhaust noise analysis 
  • Driving comfort
  • Background noise
  • Temperature control
 

 

Vibration and Comfort

 
CSI has a semi-anechoic laboratory equipped with a roller test bench with 4 drive wheels to conduct powertrain induced vibration analyses and vehicle occupant comfort assessments.
 
A road simulation laboratory fitted with a 4-poster test bench enables the CSI technician teams to examine vehicle behaviour by reproducing any road profile and to verify vehicle service life over distances of more than 100,000 km and different road surfaces. These checks are supported by the possibility of conducting tests in different weather conditions (temperature, humidity, solar radiation) so as to ensure that product quality will remain unaltered even after years of use.
 
At CSI laboratories, Squeak & Rattle tests are performed to determine noise levels in the various vehicle components, as new and after several fatigue cycles.
 
CSI has an 8-channel test bench that makes it possible to carry out exhaustive investigations and validate the technical solutions adopted for the suspension and suspension-frame anchoring points. It is possible to simulate fatigue cycles along the x-y-z directions as well as simulate brake application effects. 
 
The facilities and the know-how of CSI technicians make it possible to conduct modal analysis tests on complete vehicles, subsystems and parts. This type of analysis is used to recognise and analyse a system’s own frequencies, including those of complex systems, and to work out natural frequencies, system vibration modes and damping values.
 

 

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