Automotive Industries - Noise and Vibration Test and Measurement Solutions0 pages

Verso (Intérieur) page 2

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Made for Your
Demanding World
1- Improve Efciency

Measuring your Vehicles and Components

2- Minimize Testing Costs

3- Improve Quality

Laboratory

Improve testing efciency

> Component specication

> Integrated & automated test
process and report generation

> Engine R&D
> Subsystems NVH

> Project management and data
sharing: ASAM ODS compliant

> Sound power
> Continuously Variable
Transmission (CVT)

> Universal and multiple sensor’s
types: microphones, acceleration,
temperature, strain, pressure…

> Vehicles Structures

Rotating Analysis
Gear Analysis
Signatures coming from gear box vibrations have high frequency content. A rst
step is to analyze them using the standard FFT analysis. One can get further
with tools such as cepstrum, kurtosis and harmonic markers provided by the OROS
FFT-Diagnostics tool. The Constant Band Tracking function is also especially useful for
looking at order proles during run-ups and run-downs of the transmission train.

Hybrid Transmission
Classical or hybrid transmissions are some of the major source of vibration in
the drive train. Nowadays, Continuously Variable Transmissions (CVT) integrate a exible
transmission belt that allows an innite number of transmission ratios. In order to carry
order tracking, phase reference and rotating speed determination, the transmission ratio is
based on a mathematical formula based on 2 tachometer’s inputs.

Engines Analysis
In-Vehicule Test

Be fast and exible

> Prototype

> Portable and rugged systems for
in-vehicle tests

> Component in-vehicle
integration

> PC free operation: full signal
recording for ofce processing
archiving

> Cabin noise
> Interior NVH

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> Real-time results for direct live
monitoring
> Get all data through conditioners
and CAN Bus

The objective is the engine performance optimization and faults detections. For
example, injection delay, valves faults, can be identied with EngineDiag. This
software module integrates the machine mechanical properties: number of cylinders, ring
order and timing diagram to provide pertinent results. Time signal, overall levels, cylinders
phase alignment as well as angle-frequency representation on the machine cycle are
efcient results for R&D and prototype validation.

Vehicles
> Automotive
> Motorcycles
> Trucks & Buses

Structural Dynamics
Damping & Isolation
Absorbing and damping mounts are the components through which the vibration energy is transmitted between
the engine and the rest of the vehicle: their properties, dimensions and positions should be determined with care.
The techniques used are cross spectrum, transfer functions, damping, as well as ODS (Operating Deection Shape).

> Earth Moving Vehicles
> Industrial Vehicles
> Leisure Vehicles
> Trains

Engines
> Downsizing
> Hybrid
> Timing
> Crankshaft
> Diesel

Modal & Experimental Analysis
Modal Analysis is one of the key steps when testing vehicles and parts: it determines their structural characteristics
and so, denes how they reacts to operating excitations. Shaker or impact hammer excitations can be used to
capture the experimental datasets: the nal stage is the actual OROS Modal analysis.

Noise Analysis
Sound Power
Sound power is a key acoustical value to be determined for vehicles and various automotive components
such as alternators and motors. For qualication and production testing, the most common procedure uses
microphones and is based on sound pressure level acquisition (ISO 374x) in a free or diffuse sound eld. For portable
applications, sound intensity is preferably used to determine sound power. It is based upon measurements at discrete
points (ISO 9614-1) or via a surface scanning (ISO 9614-2). In this case, a sound intensity probe is used.

Torsional Analysis
The OROS torsional module corresponds to a frequency to voltage converter
that transforms a pulse train signal into a varying rotating speed value. This is a
common cause for vibration in engines. A typical display is the varying angular velocity
prole versus time. The rotating speed value signal can be analyzed: torsional modes can
be deduced. Provided signals can also be processed with the Synchronous Order
Analysis (SOA) module to give order tracking proles.

Source Localization
Components
> Hybrid Drivetrains
> Turbochargers

During the NVH process, the acoustical specialist is often driven by improving the understanding and control of
his product noise emission. Standard 1/3 octave analysis can be used as a rst step. The sound intensity
acquisition at discrete points allows going one step further, drawing a colored noise map and acoustic iso lines. Hot
spots and their corresponding frequencies will help the analyst to draw conclusions on how to reduce or control better the
noise emission.

> Transmissions

Balancing
Production Test

Optimize costs and quality

> Test bench maintenance

> Automate production test process

> On-line test

> Versatile tool box for all noise and
vibration troubleshooting and
diagnostics applications

> Quality check

Balancing is a common application in particular for crankshaft that is often
carried out during production. The OROS Balancing module enables to balance
quickly and accurately. The synchronous order analysis can be controlled by NVDrive for
integration into automatic balancing machines.

> Steerings
> Brakes
> Alternators
> Compressors
> Electric Motors
> Exhausts

> Test bench integration
with NVDrive

> Tires

> Balancing

> Rubber Components

On-Site Measurements & Applied Trainings
Experts from OROS come on-site for applied trainings. They will help you using your OROS
system. They can provide assistance in your measurement. They are also able to
recommend optimization in your measurement process depending on your application and
eld requirements.

They trust OROS
> “For in-vehicle tests, I really appreciate flexibility and
portability of the OROS analyzers.”

John ARISTON, 32

Noise and Vibration technician,
Road test validation division.

oros.com

www.

> Gear boxes
> Continuous Variable
Transmissions (CVT)

Data Acquisition
In-Vehicle Recording
The different components installed in a vehicle are tested on the road to validate their integration in the vehicle
(brakes, tires, turbocharger etc …). It requires a portable, rugged and easy recording system with a CAN Bus
interface. PC free recording is especially useful for the toughest conditions (D-rec).

Fatigue Test
Drive train and transmission components are submitted to high static and dynamic stress that creates fatigue in
the long term. During the prototype development and validation process, strain gauges are used to determine
these parameters. They are also determined in combination with other parameters such as acceleration or rotating speed:
having a way such as XPods, plug and play signal conditioning, to do that is essential.