NVH CHAMBER (NOISE, VIBRATION, AND HARSHNESS) MODULE
Our range of extremely low noise level of NVH chassis dynamometer systems have evolved and acquired techniques and capabilities previously only demanded in “high accuracy” emission test systems. With the continuous development of modern vehicles comes the demand for ever-improving product refinement. An increasingly significant area of this important work is the passenger’s safety and comfort.
The measurement and evaluation of vehicle noise, vibration, and harshness levels are subject to the variations in the road and climatic conditions. By using a chassis dynamometer within a semi-anechoic chamber, the difficulty in monitoring these parameters under a controlled manner can be overcome.
TeSys produces a special chassis dynamometer design that allows investigation of NVH levels whilst the vehicle is running under accurate and repeatable road load simulation, speed, force or acceleration control mode.
NVH CHAMBER TEST CHASSIS DYNAMOMETER
TeSys NVH chassis dynamometers are available as standard in single roller, 4×2, 4×4, and independent configurations.
The rollers are available from 1.8m to 2.5m in diameter, running in hydrodynamic or roller element bearings. The roller assemblies are acoustically attenuated, so-called as ‘Dead-roll’ to minimize the effect of noise generation and amplification. They can be either coated to represent a road surface or fitted with interchangeable road surface simulation shells which are now developed by TeSys process and technology in 2019.
Trunnion mounted motors compensate for system losses and simulate road load forces, vehicle inertia, and gradients. These motors are installed in isolated areas and connected to the rolls by torsionally tuned couplings and drive shafts. Acoustic shaft seals, roll covers, and breakthrough seals around the rollers ensure effective noise containment.
Wheelbase adjustment is available to accommodate different vehicles. Roller centers can be set automatically as part of the road load model information, or set to the user’s specific dimensions. The dynamometer base frame is mounted on a moving carriage.
The dynamometer is provided with a real-time control processor, control I/O architecture and a GUI (Graphic User Interface) running the latest Windows™ operating system. A powerful data logger can store system and vehicle parameters. A fully configurable real-time graphics package displays this information on the screen.
A central server function and host computer interface are available to enable data to be passed through in either direction.