NVH CHAMBER (NOISE, VIBRATION, AND HARSHNESS) MODULE
Overview
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
Description
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.
Main Features of our NVH chassis dynamometer
A Robot driver is also available to complement this chassis dynamometer to assist with repeatable results.
FEATURE ONE
48″ roll with either independent or center-mounted (MIM) AC motor
Compliant with EPA, EURO III, IV, V and VI legislative emissions test requirements
High accuracy and repeatability with fast response inertia simulation
Clean power IGBT AC drive technology
FEATURE TWO
Clean power IGBT AC drive technology
Thermally stabilized load measurement system
Twin encoders for increased accuracy
Real-time control processor and separate Graphical User Interface PC using Beckhoff I/O & EtherCat hardware platform
FEATURE THREE
Automated dynamometer performance testing routines
Above floor or secondary loadcell calibration
4×2 and 4×4 configurations
FEATURE FOUR
4×4 independent systems for Hybrid or e-Drive Vehicle testing
Robust design for the long and trouble-free operational life
Low maintenance and lifecycle costs
APPLICATIONS
· Passenger vehicle
· Commercial/Truck vehicle
· Motorcycle
OPTIONS
· Road surface simulation shells (*Developed and patented by TeSys in 2019)
· Throttle actuator or full Robot Driver
· Powered inspection hatch between rollers
· Automatic elevator between rollers (*Developed by TeSys in 2017)
· Seismic block isolation materials in either hydro spring dampers or isolation pads
· Vibration slats / Impact bars
· Low noise roller internal insulation and external surface coatings
· Pull-down system
· Driver’s Aid
· Data acquisition